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 | 178 | #define MIN_POOL_PAGES 32 |
1da177e4 | 179 | |
e18b890b | 180 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 181 | |
028867ac | 182 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 183 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 184 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 185 | |
c0297721 AK |
186 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
187 | { | |
188 | return this_cpu_ptr(cc->cpu); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Use this to access cipher attributes that are the same for each CPU. | |
193 | */ | |
194 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
195 | { | |
d1f96423 | 196 | return __this_cpu_ptr(cc->cpu)->tfms[0]; |
c0297721 AK |
197 | } |
198 | ||
1da177e4 LT |
199 | /* |
200 | * Different IV generation algorithms: | |
201 | * | |
3c164bd8 | 202 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 203 | * number, padded with zeros if necessary. |
1da177e4 | 204 | * |
61afef61 MB |
205 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
206 | * number, padded with zeros if necessary. | |
207 | * | |
3c164bd8 RS |
208 | * essiv: "encrypted sector|salt initial vector", the sector number is |
209 | * encrypted with the bulk cipher using a salt as key. The salt | |
210 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 211 | * |
48527fa7 RS |
212 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
213 | * (needed for LRW-32-AES and possible other narrow block modes) | |
214 | * | |
46b47730 LN |
215 | * null: the initial vector is always zero. Provides compatibility with |
216 | * obsolete loop_fish2 devices. Do not use for new devices. | |
217 | * | |
34745785 MB |
218 | * lmk: Compatible implementation of the block chaining mode used |
219 | * by the Loop-AES block device encryption system | |
220 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
221 | * It operates on full 512 byte sectors and uses CBC | |
222 | * with an IV derived from the sector number, the data and | |
223 | * optionally extra IV seed. | |
224 | * This means that after decryption the first block | |
225 | * of sector must be tweaked according to decrypted data. | |
226 | * Loop-AES can use three encryption schemes: | |
227 | * version 1: is plain aes-cbc mode | |
228 | * version 2: uses 64 multikey scheme with lmk IV generator | |
229 | * version 3: the same as version 2 with additional IV seed | |
230 | * (it uses 65 keys, last key is used as IV seed) | |
231 | * | |
1da177e4 LT |
232 | * plumb: unimplemented, see: |
233 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
234 | */ | |
235 | ||
2dc5327d MB |
236 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
237 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
238 | { |
239 | memset(iv, 0, cc->iv_size); | |
283a8328 | 240 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
61afef61 | 245 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 246 | struct dm_crypt_request *dmreq) |
61afef61 MB |
247 | { |
248 | memset(iv, 0, cc->iv_size); | |
283a8328 | 249 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
b95bf2d3 MB |
254 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
255 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
256 | { | |
257 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
258 | struct hash_desc desc; | |
259 | struct scatterlist sg; | |
c0297721 AK |
260 | struct crypto_cipher *essiv_tfm; |
261 | int err, cpu; | |
b95bf2d3 MB |
262 | |
263 | sg_init_one(&sg, cc->key, cc->key_size); | |
264 | desc.tfm = essiv->hash_tfm; | |
265 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
266 | ||
267 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
268 | if (err) | |
269 | return err; | |
270 | ||
c0297721 AK |
271 | for_each_possible_cpu(cpu) { |
272 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private, | |
273 | ||
274 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, | |
b95bf2d3 | 275 | crypto_hash_digestsize(essiv->hash_tfm)); |
c0297721 AK |
276 | if (err) |
277 | return err; | |
278 | } | |
279 | ||
280 | return 0; | |
b95bf2d3 MB |
281 | } |
282 | ||
542da317 MB |
283 | /* Wipe salt and reset key derived from volume key */ |
284 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
285 | { | |
286 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
287 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 AK |
288 | struct crypto_cipher *essiv_tfm; |
289 | int cpu, r, err = 0; | |
542da317 MB |
290 | |
291 | memset(essiv->salt, 0, salt_size); | |
292 | ||
c0297721 AK |
293 | for_each_possible_cpu(cpu) { |
294 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private; | |
295 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
296 | if (r) | |
297 | err = r; | |
298 | } | |
299 | ||
300 | return err; | |
301 | } | |
302 | ||
303 | /* Set up per cpu cipher state */ | |
304 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
305 | struct dm_target *ti, | |
306 | u8 *salt, unsigned saltsize) | |
307 | { | |
308 | struct crypto_cipher *essiv_tfm; | |
309 | int err; | |
310 | ||
311 | /* Setup the essiv_tfm with the given salt */ | |
312 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
313 | if (IS_ERR(essiv_tfm)) { | |
314 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
315 | return essiv_tfm; | |
316 | } | |
317 | ||
318 | if (crypto_cipher_blocksize(essiv_tfm) != | |
319 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
320 | ti->error = "Block size of ESSIV cipher does " | |
321 | "not match IV size of block cipher"; | |
322 | crypto_free_cipher(essiv_tfm); | |
323 | return ERR_PTR(-EINVAL); | |
324 | } | |
325 | ||
326 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
327 | if (err) { | |
328 | ti->error = "Failed to set key for ESSIV cipher"; | |
329 | crypto_free_cipher(essiv_tfm); | |
330 | return ERR_PTR(err); | |
331 | } | |
332 | ||
333 | return essiv_tfm; | |
542da317 MB |
334 | } |
335 | ||
60473592 MB |
336 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
337 | { | |
c0297721 AK |
338 | int cpu; |
339 | struct crypt_cpu *cpu_cc; | |
340 | struct crypto_cipher *essiv_tfm; | |
60473592 MB |
341 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
342 | ||
b95bf2d3 MB |
343 | crypto_free_hash(essiv->hash_tfm); |
344 | essiv->hash_tfm = NULL; | |
345 | ||
346 | kzfree(essiv->salt); | |
347 | essiv->salt = NULL; | |
c0297721 AK |
348 | |
349 | for_each_possible_cpu(cpu) { | |
350 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
351 | essiv_tfm = cpu_cc->iv_private; | |
352 | ||
353 | if (essiv_tfm) | |
354 | crypto_free_cipher(essiv_tfm); | |
355 | ||
356 | cpu_cc->iv_private = NULL; | |
357 | } | |
60473592 MB |
358 | } |
359 | ||
1da177e4 | 360 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 361 | const char *opts) |
1da177e4 | 362 | { |
5861f1be MB |
363 | struct crypto_cipher *essiv_tfm = NULL; |
364 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 365 | u8 *salt = NULL; |
c0297721 | 366 | int err, cpu; |
1da177e4 | 367 | |
5861f1be | 368 | if (!opts) { |
72d94861 | 369 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
370 | return -EINVAL; |
371 | } | |
372 | ||
b95bf2d3 | 373 | /* Allocate hash algorithm */ |
35058687 HX |
374 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
375 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 376 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
377 | err = PTR_ERR(hash_tfm); |
378 | goto bad; | |
1da177e4 LT |
379 | } |
380 | ||
b95bf2d3 | 381 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 382 | if (!salt) { |
72d94861 | 383 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
384 | err = -ENOMEM; |
385 | goto bad; | |
1da177e4 LT |
386 | } |
387 | ||
b95bf2d3 | 388 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
389 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
390 | ||
c0297721 AK |
391 | for_each_possible_cpu(cpu) { |
392 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, | |
393 | crypto_hash_digestsize(hash_tfm)); | |
394 | if (IS_ERR(essiv_tfm)) { | |
395 | crypt_iv_essiv_dtr(cc); | |
396 | return PTR_ERR(essiv_tfm); | |
397 | } | |
398 | per_cpu_ptr(cc->cpu, cpu)->iv_private = essiv_tfm; | |
399 | } | |
400 | ||
1da177e4 | 401 | return 0; |
5861f1be MB |
402 | |
403 | bad: | |
5861f1be MB |
404 | if (hash_tfm && !IS_ERR(hash_tfm)) |
405 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 406 | kfree(salt); |
5861f1be | 407 | return err; |
1da177e4 LT |
408 | } |
409 | ||
2dc5327d MB |
410 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
411 | struct dm_crypt_request *dmreq) | |
1da177e4 | 412 | { |
c0297721 AK |
413 | struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private; |
414 | ||
1da177e4 | 415 | memset(iv, 0, cc->iv_size); |
283a8328 | 416 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
417 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
418 | ||
1da177e4 LT |
419 | return 0; |
420 | } | |
421 | ||
48527fa7 RS |
422 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
423 | const char *opts) | |
424 | { | |
c0297721 | 425 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 426 | int log = ilog2(bs); |
48527fa7 RS |
427 | |
428 | /* we need to calculate how far we must shift the sector count | |
429 | * to get the cipher block count, we use this shift in _gen */ | |
430 | ||
431 | if (1 << log != bs) { | |
432 | ti->error = "cypher blocksize is not a power of 2"; | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | if (log > 9) { | |
437 | ti->error = "cypher blocksize is > 512"; | |
438 | return -EINVAL; | |
439 | } | |
440 | ||
60473592 | 441 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
447 | { | |
48527fa7 RS |
448 | } |
449 | ||
2dc5327d MB |
450 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
451 | struct dm_crypt_request *dmreq) | |
48527fa7 | 452 | { |
79066ad3 HX |
453 | __be64 val; |
454 | ||
48527fa7 | 455 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 456 | |
2dc5327d | 457 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 458 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 459 | |
1da177e4 LT |
460 | return 0; |
461 | } | |
462 | ||
2dc5327d MB |
463 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
464 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
465 | { |
466 | memset(iv, 0, cc->iv_size); | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
34745785 MB |
471 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
472 | { | |
473 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
474 | ||
475 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
476 | crypto_free_shash(lmk->hash_tfm); | |
477 | lmk->hash_tfm = NULL; | |
478 | ||
479 | kzfree(lmk->seed); | |
480 | lmk->seed = NULL; | |
481 | } | |
482 | ||
483 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
484 | const char *opts) | |
485 | { | |
486 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
487 | ||
488 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
489 | if (IS_ERR(lmk->hash_tfm)) { | |
490 | ti->error = "Error initializing LMK hash"; | |
491 | return PTR_ERR(lmk->hash_tfm); | |
492 | } | |
493 | ||
494 | /* No seed in LMK version 2 */ | |
495 | if (cc->key_parts == cc->tfms_count) { | |
496 | lmk->seed = NULL; | |
497 | return 0; | |
498 | } | |
499 | ||
500 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
501 | if (!lmk->seed) { | |
502 | crypt_iv_lmk_dtr(cc); | |
503 | ti->error = "Error kmallocing seed storage in LMK"; | |
504 | return -ENOMEM; | |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
511 | { | |
512 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
513 | int subkey_size = cc->key_size / cc->key_parts; | |
514 | ||
515 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
516 | if (lmk->seed) | |
517 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
518 | crypto_shash_digestsize(lmk->hash_tfm)); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
524 | { | |
525 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
526 | ||
527 | if (lmk->seed) | |
528 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
534 | struct dm_crypt_request *dmreq, | |
535 | u8 *data) | |
536 | { | |
537 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
538 | struct { | |
539 | struct shash_desc desc; | |
540 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
541 | } sdesc; | |
542 | struct md5_state md5state; | |
543 | u32 buf[4]; | |
544 | int i, r; | |
545 | ||
546 | sdesc.desc.tfm = lmk->hash_tfm; | |
547 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
548 | ||
549 | r = crypto_shash_init(&sdesc.desc); | |
550 | if (r) | |
551 | return r; | |
552 | ||
553 | if (lmk->seed) { | |
554 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
555 | if (r) | |
556 | return r; | |
557 | } | |
558 | ||
559 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
560 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
561 | if (r) | |
562 | return r; | |
563 | ||
564 | /* Sector is cropped to 56 bits here */ | |
565 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
566 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
567 | buf[2] = cpu_to_le32(4024); | |
568 | buf[3] = 0; | |
569 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
570 | if (r) | |
571 | return r; | |
572 | ||
573 | /* No MD5 padding here */ | |
574 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
575 | if (r) | |
576 | return r; | |
577 | ||
578 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
579 | __cpu_to_le32s(&md5state.hash[i]); | |
580 | memcpy(iv, &md5state.hash, cc->iv_size); | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
586 | struct dm_crypt_request *dmreq) | |
587 | { | |
588 | u8 *src; | |
589 | int r = 0; | |
590 | ||
591 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 592 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 593 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 594 | kunmap_atomic(src); |
34745785 MB |
595 | } else |
596 | memset(iv, 0, cc->iv_size); | |
597 | ||
598 | return r; | |
599 | } | |
600 | ||
601 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
602 | struct dm_crypt_request *dmreq) | |
603 | { | |
604 | u8 *dst; | |
605 | int r; | |
606 | ||
607 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
608 | return 0; | |
609 | ||
c2e022cb | 610 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
611 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
612 | ||
613 | /* Tweak the first block of plaintext sector */ | |
614 | if (!r) | |
615 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
616 | ||
c2e022cb | 617 | kunmap_atomic(dst); |
34745785 MB |
618 | return r; |
619 | } | |
620 | ||
1da177e4 LT |
621 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
622 | .generator = crypt_iv_plain_gen | |
623 | }; | |
624 | ||
61afef61 MB |
625 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
626 | .generator = crypt_iv_plain64_gen | |
627 | }; | |
628 | ||
1da177e4 LT |
629 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
630 | .ctr = crypt_iv_essiv_ctr, | |
631 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 632 | .init = crypt_iv_essiv_init, |
542da317 | 633 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
634 | .generator = crypt_iv_essiv_gen |
635 | }; | |
636 | ||
48527fa7 RS |
637 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
638 | .ctr = crypt_iv_benbi_ctr, | |
639 | .dtr = crypt_iv_benbi_dtr, | |
640 | .generator = crypt_iv_benbi_gen | |
641 | }; | |
1da177e4 | 642 | |
46b47730 LN |
643 | static struct crypt_iv_operations crypt_iv_null_ops = { |
644 | .generator = crypt_iv_null_gen | |
645 | }; | |
646 | ||
34745785 MB |
647 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
648 | .ctr = crypt_iv_lmk_ctr, | |
649 | .dtr = crypt_iv_lmk_dtr, | |
650 | .init = crypt_iv_lmk_init, | |
651 | .wipe = crypt_iv_lmk_wipe, | |
652 | .generator = crypt_iv_lmk_gen, | |
653 | .post = crypt_iv_lmk_post | |
654 | }; | |
655 | ||
d469f841 MB |
656 | static void crypt_convert_init(struct crypt_config *cc, |
657 | struct convert_context *ctx, | |
658 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 659 | sector_t sector) |
1da177e4 LT |
660 | { |
661 | ctx->bio_in = bio_in; | |
662 | ctx->bio_out = bio_out; | |
663 | ctx->offset_in = 0; | |
664 | ctx->offset_out = 0; | |
665 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
666 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
667 | ctx->sector = sector + cc->iv_offset; | |
43d69034 | 668 | init_completion(&ctx->restart); |
1da177e4 LT |
669 | } |
670 | ||
b2174eeb HY |
671 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
672 | struct ablkcipher_request *req) | |
673 | { | |
674 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
675 | } | |
676 | ||
677 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
678 | struct dm_crypt_request *dmreq) | |
679 | { | |
680 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
681 | } | |
682 | ||
2dc5327d MB |
683 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
684 | struct dm_crypt_request *dmreq) | |
685 | { | |
686 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
687 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
688 | } | |
689 | ||
01482b76 | 690 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
691 | struct convert_context *ctx, |
692 | struct ablkcipher_request *req) | |
01482b76 MB |
693 | { |
694 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
695 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
696 | struct dm_crypt_request *dmreq; |
697 | u8 *iv; | |
698 | int r = 0; | |
699 | ||
b2174eeb | 700 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 701 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 702 | |
2dc5327d | 703 | dmreq->iv_sector = ctx->sector; |
b2174eeb | 704 | dmreq->ctx = ctx; |
3a7f6c99 MB |
705 | sg_init_table(&dmreq->sg_in, 1); |
706 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
707 | bv_in->bv_offset + ctx->offset_in); |
708 | ||
3a7f6c99 MB |
709 | sg_init_table(&dmreq->sg_out, 1); |
710 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
711 | bv_out->bv_offset + ctx->offset_out); |
712 | ||
713 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
714 | if (ctx->offset_in >= bv_in->bv_len) { | |
715 | ctx->offset_in = 0; | |
716 | ctx->idx_in++; | |
717 | } | |
718 | ||
719 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
720 | if (ctx->offset_out >= bv_out->bv_len) { | |
721 | ctx->offset_out = 0; | |
722 | ctx->idx_out++; | |
723 | } | |
724 | ||
3a7f6c99 | 725 | if (cc->iv_gen_ops) { |
2dc5327d | 726 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
727 | if (r < 0) |
728 | return r; | |
729 | } | |
730 | ||
731 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
732 | 1 << SECTOR_SHIFT, iv); | |
733 | ||
734 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
735 | r = crypto_ablkcipher_encrypt(req); | |
736 | else | |
737 | r = crypto_ablkcipher_decrypt(req); | |
738 | ||
2dc5327d MB |
739 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
740 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
741 | ||
3a7f6c99 | 742 | return r; |
01482b76 MB |
743 | } |
744 | ||
95497a96 MB |
745 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
746 | int error); | |
c0297721 | 747 | |
ddd42edf MB |
748 | static void crypt_alloc_req(struct crypt_config *cc, |
749 | struct convert_context *ctx) | |
750 | { | |
c0297721 | 751 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
d1f96423 | 752 | unsigned key_index = ctx->sector & (cc->tfms_count - 1); |
c0297721 AK |
753 | |
754 | if (!this_cc->req) | |
755 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
756 | ||
d1f96423 | 757 | ablkcipher_request_set_tfm(this_cc->req, this_cc->tfms[key_index]); |
c0297721 AK |
758 | ablkcipher_request_set_callback(this_cc->req, |
759 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
760 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
761 | } |
762 | ||
1da177e4 LT |
763 | /* |
764 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
765 | */ | |
766 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 767 | struct convert_context *ctx) |
1da177e4 | 768 | { |
c0297721 | 769 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 770 | int r; |
1da177e4 | 771 | |
c8081618 MB |
772 | atomic_set(&ctx->pending, 1); |
773 | ||
1da177e4 LT |
774 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
775 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 776 | |
3a7f6c99 MB |
777 | crypt_alloc_req(cc, ctx); |
778 | ||
3f1e9070 MB |
779 | atomic_inc(&ctx->pending); |
780 | ||
c0297721 | 781 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
782 | |
783 | switch (r) { | |
3f1e9070 | 784 | /* async */ |
3a7f6c99 MB |
785 | case -EBUSY: |
786 | wait_for_completion(&ctx->restart); | |
787 | INIT_COMPLETION(ctx->restart); | |
788 | /* fall through*/ | |
789 | case -EINPROGRESS: | |
c0297721 | 790 | this_cc->req = NULL; |
3f1e9070 MB |
791 | ctx->sector++; |
792 | continue; | |
793 | ||
794 | /* sync */ | |
3a7f6c99 | 795 | case 0: |
3f1e9070 | 796 | atomic_dec(&ctx->pending); |
3a7f6c99 | 797 | ctx->sector++; |
c7f1b204 | 798 | cond_resched(); |
3a7f6c99 | 799 | continue; |
3a7f6c99 | 800 | |
3f1e9070 MB |
801 | /* error */ |
802 | default: | |
803 | atomic_dec(&ctx->pending); | |
804 | return r; | |
805 | } | |
1da177e4 LT |
806 | } |
807 | ||
3f1e9070 | 808 | return 0; |
1da177e4 LT |
809 | } |
810 | ||
d469f841 MB |
811 | static void dm_crypt_bio_destructor(struct bio *bio) |
812 | { | |
028867ac | 813 | struct dm_crypt_io *io = bio->bi_private; |
6a24c718 MB |
814 | struct crypt_config *cc = io->target->private; |
815 | ||
816 | bio_free(bio, cc->bs); | |
d469f841 | 817 | } |
6a24c718 | 818 | |
1da177e4 LT |
819 | /* |
820 | * Generate a new unfragmented bio with the given size | |
821 | * This should never violate the device limitations | |
933f01d4 MB |
822 | * May return a smaller bio when running out of pages, indicated by |
823 | * *out_of_pages set to 1. | |
1da177e4 | 824 | */ |
933f01d4 MB |
825 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
826 | unsigned *out_of_pages) | |
1da177e4 | 827 | { |
027581f3 | 828 | struct crypt_config *cc = io->target->private; |
8b004457 | 829 | struct bio *clone; |
1da177e4 | 830 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 831 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
832 | unsigned i, len; |
833 | struct page *page; | |
1da177e4 | 834 | |
2f9941b6 | 835 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 836 | if (!clone) |
1da177e4 | 837 | return NULL; |
1da177e4 | 838 | |
027581f3 | 839 | clone_init(io, clone); |
933f01d4 | 840 | *out_of_pages = 0; |
6a24c718 | 841 | |
f97380bc | 842 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 843 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
844 | if (!page) { |
845 | *out_of_pages = 1; | |
1da177e4 | 846 | break; |
933f01d4 | 847 | } |
1da177e4 LT |
848 | |
849 | /* | |
aeb2deae MP |
850 | * If additional pages cannot be allocated without waiting, |
851 | * return a partially-allocated bio. The caller will then try | |
852 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 853 | */ |
aeb2deae | 854 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 855 | |
91e10625 MB |
856 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
857 | ||
858 | if (!bio_add_page(clone, page, len, 0)) { | |
859 | mempool_free(page, cc->page_pool); | |
860 | break; | |
861 | } | |
1da177e4 | 862 | |
91e10625 | 863 | size -= len; |
1da177e4 LT |
864 | } |
865 | ||
8b004457 MB |
866 | if (!clone->bi_size) { |
867 | bio_put(clone); | |
1da177e4 LT |
868 | return NULL; |
869 | } | |
870 | ||
8b004457 | 871 | return clone; |
1da177e4 LT |
872 | } |
873 | ||
644bd2f0 | 874 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 875 | { |
644bd2f0 | 876 | unsigned int i; |
1da177e4 LT |
877 | struct bio_vec *bv; |
878 | ||
644bd2f0 | 879 | for (i = 0; i < clone->bi_vcnt; i++) { |
8b004457 | 880 | bv = bio_iovec_idx(clone, i); |
1da177e4 LT |
881 | BUG_ON(!bv->bv_page); |
882 | mempool_free(bv->bv_page, cc->page_pool); | |
883 | bv->bv_page = NULL; | |
884 | } | |
885 | } | |
886 | ||
dc440d1e MB |
887 | static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, |
888 | struct bio *bio, sector_t sector) | |
889 | { | |
890 | struct crypt_config *cc = ti->private; | |
891 | struct dm_crypt_io *io; | |
892 | ||
893 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
894 | io->target = ti; | |
895 | io->base_bio = bio; | |
896 | io->sector = sector; | |
897 | io->error = 0; | |
393b47ef | 898 | io->base_io = NULL; |
dc440d1e MB |
899 | atomic_set(&io->pending, 0); |
900 | ||
901 | return io; | |
902 | } | |
903 | ||
3e1a8bdd MB |
904 | static void crypt_inc_pending(struct dm_crypt_io *io) |
905 | { | |
906 | atomic_inc(&io->pending); | |
907 | } | |
908 | ||
1da177e4 LT |
909 | /* |
910 | * One of the bios was finished. Check for completion of | |
911 | * the whole request and correctly clean up the buffer. | |
393b47ef | 912 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 913 | */ |
5742fd77 | 914 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 915 | { |
5742fd77 | 916 | struct crypt_config *cc = io->target->private; |
b35f8caa MB |
917 | struct bio *base_bio = io->base_bio; |
918 | struct dm_crypt_io *base_io = io->base_io; | |
919 | int error = io->error; | |
1da177e4 LT |
920 | |
921 | if (!atomic_dec_and_test(&io->pending)) | |
922 | return; | |
923 | ||
b35f8caa MB |
924 | mempool_free(io, cc->io_pool); |
925 | ||
926 | if (likely(!base_io)) | |
927 | bio_endio(base_bio, error); | |
393b47ef | 928 | else { |
b35f8caa MB |
929 | if (error && !base_io->error) |
930 | base_io->error = error; | |
931 | crypt_dec_pending(base_io); | |
393b47ef | 932 | } |
1da177e4 LT |
933 | } |
934 | ||
935 | /* | |
cabf08e4 | 936 | * kcryptd/kcryptd_io: |
1da177e4 LT |
937 | * |
938 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 939 | * interrupt context. |
cabf08e4 MB |
940 | * |
941 | * kcryptd performs the actual encryption or decryption. | |
942 | * | |
943 | * kcryptd_io performs the IO submission. | |
944 | * | |
945 | * They must be separated as otherwise the final stages could be | |
946 | * starved by new requests which can block in the first stages due | |
947 | * to memory allocation. | |
c0297721 AK |
948 | * |
949 | * The work is done per CPU global for all dm-crypt instances. | |
950 | * They should not depend on each other and do not block. | |
1da177e4 | 951 | */ |
6712ecf8 | 952 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 953 | { |
028867ac | 954 | struct dm_crypt_io *io = clone->bi_private; |
8b004457 | 955 | struct crypt_config *cc = io->target->private; |
ee7a491e | 956 | unsigned rw = bio_data_dir(clone); |
8b004457 | 957 | |
adfe4770 MB |
958 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
959 | error = -EIO; | |
960 | ||
8b004457 | 961 | /* |
6712ecf8 | 962 | * free the processed pages |
8b004457 | 963 | */ |
ee7a491e | 964 | if (rw == WRITE) |
644bd2f0 | 965 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
966 | |
967 | bio_put(clone); | |
8b004457 | 968 | |
ee7a491e MB |
969 | if (rw == READ && !error) { |
970 | kcryptd_queue_crypt(io); | |
971 | return; | |
972 | } | |
5742fd77 MB |
973 | |
974 | if (unlikely(error)) | |
975 | io->error = error; | |
976 | ||
977 | crypt_dec_pending(io); | |
8b004457 MB |
978 | } |
979 | ||
028867ac | 980 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 MB |
981 | { |
982 | struct crypt_config *cc = io->target->private; | |
983 | ||
984 | clone->bi_private = io; | |
985 | clone->bi_end_io = crypt_endio; | |
986 | clone->bi_bdev = cc->dev->bdev; | |
987 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 988 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
989 | } |
990 | ||
20c82538 | 991 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 MB |
992 | { |
993 | struct crypt_config *cc = io->target->private; | |
994 | struct bio *base_bio = io->base_bio; | |
995 | struct bio *clone; | |
93e605c2 | 996 | |
8b004457 MB |
997 | /* |
998 | * The block layer might modify the bvec array, so always | |
999 | * copy the required bvecs because we need the original | |
1000 | * one in order to decrypt the whole bio data *afterwards*. | |
1001 | */ | |
20c82538 | 1002 | clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); |
7eaceacc | 1003 | if (!clone) |
20c82538 | 1004 | return 1; |
8b004457 | 1005 | |
20c82538 MB |
1006 | crypt_inc_pending(io); |
1007 | ||
8b004457 MB |
1008 | clone_init(io, clone); |
1009 | clone->bi_idx = 0; | |
1010 | clone->bi_vcnt = bio_segments(base_bio); | |
1011 | clone->bi_size = base_bio->bi_size; | |
0c395b0f | 1012 | clone->bi_sector = cc->start + io->sector; |
8b004457 MB |
1013 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
1014 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 1015 | |
93e605c2 | 1016 | generic_make_request(clone); |
20c82538 | 1017 | return 0; |
8b004457 MB |
1018 | } |
1019 | ||
4e4eef64 MB |
1020 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1021 | { | |
95497a96 | 1022 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1023 | generic_make_request(clone); |
4e4eef64 MB |
1024 | } |
1025 | ||
395b167c AK |
1026 | static void kcryptd_io(struct work_struct *work) |
1027 | { | |
1028 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1029 | ||
20c82538 MB |
1030 | if (bio_data_dir(io->base_bio) == READ) { |
1031 | crypt_inc_pending(io); | |
1032 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1033 | io->error = -ENOMEM; | |
1034 | crypt_dec_pending(io); | |
1035 | } else | |
395b167c AK |
1036 | kcryptd_io_write(io); |
1037 | } | |
1038 | ||
1039 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1040 | { | |
1041 | struct crypt_config *cc = io->target->private; | |
1042 | ||
1043 | INIT_WORK(&io->work, kcryptd_io); | |
1044 | queue_work(cc->io_queue, &io->work); | |
1045 | } | |
1046 | ||
72c6e7af | 1047 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1048 | { |
dec1cedf MB |
1049 | struct bio *clone = io->ctx.bio_out; |
1050 | struct crypt_config *cc = io->target->private; | |
1051 | ||
72c6e7af | 1052 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1053 | crypt_free_buffer_pages(cc, clone); |
1054 | bio_put(clone); | |
6c031f41 | 1055 | crypt_dec_pending(io); |
dec1cedf MB |
1056 | return; |
1057 | } | |
1058 | ||
1059 | /* crypt_convert should have filled the clone bio */ | |
1060 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1061 | ||
1062 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1063 | |
95497a96 MB |
1064 | if (async) |
1065 | kcryptd_queue_io(io); | |
1e37bb8e | 1066 | else |
95497a96 | 1067 | generic_make_request(clone); |
4e4eef64 MB |
1068 | } |
1069 | ||
fc5a5e9a | 1070 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 MB |
1071 | { |
1072 | struct crypt_config *cc = io->target->private; | |
8b004457 | 1073 | struct bio *clone; |
393b47ef | 1074 | struct dm_crypt_io *new_io; |
c8081618 | 1075 | int crypt_finished; |
933f01d4 | 1076 | unsigned out_of_pages = 0; |
dec1cedf | 1077 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1078 | sector_t sector = io->sector; |
dec1cedf | 1079 | int r; |
8b004457 | 1080 | |
fc5a5e9a MB |
1081 | /* |
1082 | * Prevent io from disappearing until this function completes. | |
1083 | */ | |
1084 | crypt_inc_pending(io); | |
b635b00e | 1085 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1086 | |
93e605c2 MB |
1087 | /* |
1088 | * The allocated buffers can be smaller than the whole bio, | |
1089 | * so repeat the whole process until all the data can be handled. | |
1090 | */ | |
1091 | while (remaining) { | |
933f01d4 | 1092 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1093 | if (unlikely(!clone)) { |
5742fd77 | 1094 | io->error = -ENOMEM; |
fc5a5e9a | 1095 | break; |
23541d2d | 1096 | } |
93e605c2 | 1097 | |
53017030 MB |
1098 | io->ctx.bio_out = clone; |
1099 | io->ctx.idx_out = 0; | |
93e605c2 | 1100 | |
dec1cedf | 1101 | remaining -= clone->bi_size; |
b635b00e | 1102 | sector += bio_sectors(clone); |
93e605c2 | 1103 | |
4e594098 | 1104 | crypt_inc_pending(io); |
72c6e7af | 1105 | |
dec1cedf | 1106 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1107 | if (r < 0) |
1108 | io->error = -EIO; | |
1109 | ||
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) { | |
72c6e7af | 1114 | kcryptd_crypt_write_io_submit(io, 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 | ||
72c6e7af | 1165 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1166 | { |
5742fd77 MB |
1167 | crypt_dec_pending(io); |
1168 | } | |
1169 | ||
4e4eef64 | 1170 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 MB |
1171 | { |
1172 | struct crypt_config *cc = io->target->private; | |
5742fd77 | 1173 | int r = 0; |
1da177e4 | 1174 | |
3e1a8bdd | 1175 | crypt_inc_pending(io); |
3a7f6c99 | 1176 | |
53017030 | 1177 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1178 | io->sector); |
1da177e4 | 1179 | |
5742fd77 | 1180 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1181 | if (r < 0) |
1182 | io->error = -EIO; | |
5742fd77 | 1183 | |
3f1e9070 | 1184 | if (atomic_dec_and_test(&io->ctx.pending)) |
72c6e7af | 1185 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1186 | |
1187 | crypt_dec_pending(io); | |
1da177e4 LT |
1188 | } |
1189 | ||
95497a96 MB |
1190 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1191 | int error) | |
1192 | { | |
b2174eeb HY |
1193 | struct dm_crypt_request *dmreq = async_req->data; |
1194 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 MB |
1195 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
1196 | struct crypt_config *cc = io->target->private; | |
1197 | ||
1198 | if (error == -EINPROGRESS) { | |
1199 | complete(&ctx->restart); | |
1200 | return; | |
1201 | } | |
1202 | ||
2dc5327d MB |
1203 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1204 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1205 | ||
72c6e7af MP |
1206 | if (error < 0) |
1207 | io->error = -EIO; | |
1208 | ||
b2174eeb | 1209 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 MB |
1210 | |
1211 | if (!atomic_dec_and_test(&ctx->pending)) | |
1212 | return; | |
1213 | ||
1214 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1215 | kcryptd_crypt_read_done(io); |
95497a96 | 1216 | else |
72c6e7af | 1217 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1218 | } |
1219 | ||
395b167c | 1220 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1221 | { |
028867ac | 1222 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1223 | |
cabf08e4 | 1224 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1225 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1226 | else |
395b167c | 1227 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1228 | } |
1229 | ||
395b167c | 1230 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1231 | { |
395b167c | 1232 | struct crypt_config *cc = io->target->private; |
cabf08e4 | 1233 | |
395b167c AK |
1234 | INIT_WORK(&io->work, kcryptd_crypt); |
1235 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | /* | |
1239 | * Decode key from its hex representation | |
1240 | */ | |
1241 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1242 | { | |
1243 | char buffer[3]; | |
1244 | char *endp; | |
1245 | unsigned int i; | |
1246 | ||
1247 | buffer[2] = '\0'; | |
1248 | ||
8b004457 | 1249 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1250 | buffer[0] = *hex++; |
1251 | buffer[1] = *hex++; | |
1252 | ||
1253 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
1254 | ||
1255 | if (endp != &buffer[2]) | |
1256 | return -EINVAL; | |
1257 | } | |
1258 | ||
1259 | if (*hex != '\0') | |
1260 | return -EINVAL; | |
1261 | ||
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Encode key into its hex representation | |
1267 | */ | |
1268 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
1269 | { | |
1270 | unsigned int i; | |
1271 | ||
8b004457 | 1272 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1273 | sprintf(hex, "%02x", *key); |
1274 | hex += 2; | |
1275 | key++; | |
1276 | } | |
1277 | } | |
1278 | ||
d1f96423 MB |
1279 | static void crypt_free_tfms(struct crypt_config *cc, int cpu) |
1280 | { | |
1281 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1282 | unsigned i; | |
1283 | ||
1284 | for (i = 0; i < cc->tfms_count; i++) | |
1285 | if (cpu_cc->tfms[i] && !IS_ERR(cpu_cc->tfms[i])) { | |
1286 | crypto_free_ablkcipher(cpu_cc->tfms[i]); | |
1287 | cpu_cc->tfms[i] = NULL; | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | static int crypt_alloc_tfms(struct crypt_config *cc, int cpu, char *ciphermode) | |
1292 | { | |
1293 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1294 | unsigned i; | |
1295 | int err; | |
1296 | ||
1297 | for (i = 0; i < cc->tfms_count; i++) { | |
1298 | cpu_cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); | |
1299 | if (IS_ERR(cpu_cc->tfms[i])) { | |
1300 | err = PTR_ERR(cpu_cc->tfms[i]); | |
1301 | crypt_free_tfms(cc, cpu); | |
1302 | return err; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
c0297721 AK |
1309 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1310 | { | |
d1f96423 MB |
1311 | unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); |
1312 | int cpu, err = 0, i, r; | |
c0297721 AK |
1313 | |
1314 | for_each_possible_cpu(cpu) { | |
d1f96423 MB |
1315 | for (i = 0; i < cc->tfms_count; i++) { |
1316 | r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfms[i], | |
1317 | cc->key + (i * subkey_size), subkey_size); | |
1318 | if (r) | |
1319 | err = r; | |
1320 | } | |
c0297721 AK |
1321 | } |
1322 | ||
1323 | return err; | |
1324 | } | |
1325 | ||
e48d4bbf MB |
1326 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1327 | { | |
de8be5ac MB |
1328 | int r = -EINVAL; |
1329 | int key_string_len = strlen(key); | |
1330 | ||
69a8cfcd | 1331 | /* The key size may not be changed. */ |
de8be5ac MB |
1332 | if (cc->key_size != (key_string_len >> 1)) |
1333 | goto out; | |
e48d4bbf | 1334 | |
69a8cfcd MB |
1335 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1336 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1337 | goto out; |
e48d4bbf | 1338 | |
69a8cfcd | 1339 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1340 | goto out; |
e48d4bbf MB |
1341 | |
1342 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1343 | ||
de8be5ac MB |
1344 | r = crypt_setkey_allcpus(cc); |
1345 | ||
1346 | out: | |
1347 | /* Hex key string not needed after here, so wipe it. */ | |
1348 | memset(key, '0', key_string_len); | |
1349 | ||
1350 | return r; | |
e48d4bbf MB |
1351 | } |
1352 | ||
1353 | static int crypt_wipe_key(struct crypt_config *cc) | |
1354 | { | |
1355 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1356 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1357 | |
1358 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1359 | } |
1360 | ||
28513fcc MB |
1361 | static void crypt_dtr(struct dm_target *ti) |
1362 | { | |
1363 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1364 | struct crypt_cpu *cpu_cc; |
1365 | int cpu; | |
28513fcc MB |
1366 | |
1367 | ti->private = NULL; | |
1368 | ||
1369 | if (!cc) | |
1370 | return; | |
1371 | ||
1372 | if (cc->io_queue) | |
1373 | destroy_workqueue(cc->io_queue); | |
1374 | if (cc->crypt_queue) | |
1375 | destroy_workqueue(cc->crypt_queue); | |
1376 | ||
c0297721 AK |
1377 | if (cc->cpu) |
1378 | for_each_possible_cpu(cpu) { | |
1379 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1380 | if (cpu_cc->req) | |
1381 | mempool_free(cpu_cc->req, cc->req_pool); | |
d1f96423 | 1382 | crypt_free_tfms(cc, cpu); |
c0297721 AK |
1383 | } |
1384 | ||
28513fcc MB |
1385 | if (cc->bs) |
1386 | bioset_free(cc->bs); | |
1387 | ||
1388 | if (cc->page_pool) | |
1389 | mempool_destroy(cc->page_pool); | |
1390 | if (cc->req_pool) | |
1391 | mempool_destroy(cc->req_pool); | |
1392 | if (cc->io_pool) | |
1393 | mempool_destroy(cc->io_pool); | |
1394 | ||
1395 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1396 | cc->iv_gen_ops->dtr(cc); | |
1397 | ||
28513fcc MB |
1398 | if (cc->dev) |
1399 | dm_put_device(ti, cc->dev); | |
1400 | ||
c0297721 AK |
1401 | if (cc->cpu) |
1402 | free_percpu(cc->cpu); | |
1403 | ||
5ebaee6d | 1404 | kzfree(cc->cipher); |
7dbcd137 | 1405 | kzfree(cc->cipher_string); |
28513fcc MB |
1406 | |
1407 | /* Must zero key material before freeing */ | |
1408 | kzfree(cc); | |
1409 | } | |
1410 | ||
5ebaee6d MB |
1411 | static int crypt_ctr_cipher(struct dm_target *ti, |
1412 | char *cipher_in, char *key) | |
1da177e4 | 1413 | { |
5ebaee6d | 1414 | struct crypt_config *cc = ti->private; |
d1f96423 | 1415 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1416 | char *cipher_api = NULL; |
c0297721 | 1417 | int cpu, ret = -EINVAL; |
31998ef1 | 1418 | char dummy; |
1da177e4 | 1419 | |
5ebaee6d MB |
1420 | /* Convert to crypto api definition? */ |
1421 | if (strchr(cipher_in, '(')) { | |
1422 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1423 | return -EINVAL; |
1424 | } | |
1425 | ||
7dbcd137 MB |
1426 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1427 | if (!cc->cipher_string) | |
1428 | goto bad_mem; | |
1429 | ||
5ebaee6d MB |
1430 | /* |
1431 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1432 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1433 | */ |
1434 | tmp = cipher_in; | |
d1f96423 MB |
1435 | keycount = strsep(&tmp, "-"); |
1436 | cipher = strsep(&keycount, ":"); | |
1437 | ||
1438 | if (!keycount) | |
1439 | cc->tfms_count = 1; | |
31998ef1 | 1440 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1441 | !is_power_of_2(cc->tfms_count)) { |
1442 | ti->error = "Bad cipher key count specification"; | |
1443 | return -EINVAL; | |
1444 | } | |
1445 | cc->key_parts = cc->tfms_count; | |
5ebaee6d MB |
1446 | |
1447 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1448 | if (!cc->cipher) | |
1449 | goto bad_mem; | |
1450 | ||
1da177e4 LT |
1451 | chainmode = strsep(&tmp, "-"); |
1452 | ivopts = strsep(&tmp, "-"); | |
1453 | ivmode = strsep(&ivopts, ":"); | |
1454 | ||
1455 | if (tmp) | |
5ebaee6d | 1456 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1457 | |
d1f96423 MB |
1458 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)) + |
1459 | cc->tfms_count * sizeof(*(cc->cpu->tfms)), | |
1460 | __alignof__(struct crypt_cpu)); | |
c0297721 AK |
1461 | if (!cc->cpu) { |
1462 | ti->error = "Cannot allocate per cpu state"; | |
1463 | goto bad_mem; | |
1464 | } | |
1465 | ||
7dbcd137 MB |
1466 | /* |
1467 | * For compatibility with the original dm-crypt mapping format, if | |
1468 | * only the cipher name is supplied, use cbc-plain. | |
1469 | */ | |
5ebaee6d | 1470 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1471 | chainmode = "cbc"; |
1472 | ivmode = "plain"; | |
1473 | } | |
1474 | ||
d1806f6a | 1475 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1476 | ti->error = "IV mechanism required"; |
1477 | return -EINVAL; | |
1da177e4 LT |
1478 | } |
1479 | ||
5ebaee6d MB |
1480 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1481 | if (!cipher_api) | |
1482 | goto bad_mem; | |
1483 | ||
1484 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1485 | "%s(%s)", chainmode, cipher); | |
1486 | if (ret < 0) { | |
1487 | kfree(cipher_api); | |
1488 | goto bad_mem; | |
1da177e4 LT |
1489 | } |
1490 | ||
5ebaee6d | 1491 | /* Allocate cipher */ |
c0297721 | 1492 | for_each_possible_cpu(cpu) { |
d1f96423 MB |
1493 | ret = crypt_alloc_tfms(cc, cpu, cipher_api); |
1494 | if (ret < 0) { | |
c0297721 AK |
1495 | ti->error = "Error allocating crypto tfm"; |
1496 | goto bad; | |
1497 | } | |
1da177e4 | 1498 | } |
1da177e4 | 1499 | |
5ebaee6d MB |
1500 | /* Initialize and set key */ |
1501 | ret = crypt_set_key(cc, key); | |
28513fcc | 1502 | if (ret < 0) { |
0b430958 | 1503 | ti->error = "Error decoding and setting key"; |
28513fcc | 1504 | goto bad; |
0b430958 MB |
1505 | } |
1506 | ||
5ebaee6d | 1507 | /* Initialize IV */ |
c0297721 | 1508 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1509 | if (cc->iv_size) |
1510 | /* at least a 64 bit sector number should fit in our buffer */ | |
1511 | cc->iv_size = max(cc->iv_size, | |
1512 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1513 | else if (ivmode) { | |
1514 | DMWARN("Selected cipher does not support IVs"); | |
1515 | ivmode = NULL; | |
1516 | } | |
1517 | ||
1518 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1519 | if (ivmode == NULL) |
1520 | cc->iv_gen_ops = NULL; | |
1521 | else if (strcmp(ivmode, "plain") == 0) | |
1522 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1523 | else if (strcmp(ivmode, "plain64") == 0) |
1524 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1525 | else if (strcmp(ivmode, "essiv") == 0) |
1526 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1527 | else if (strcmp(ivmode, "benbi") == 0) |
1528 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1529 | else if (strcmp(ivmode, "null") == 0) |
1530 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1531 | else if (strcmp(ivmode, "lmk") == 0) { |
1532 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
1533 | /* Version 2 and 3 is recognised according | |
1534 | * to length of provided multi-key string. | |
1535 | * If present (version 3), last key is used as IV seed. | |
1536 | */ | |
1537 | if (cc->key_size % cc->key_parts) | |
1538 | cc->key_parts++; | |
1539 | } else { | |
5ebaee6d | 1540 | ret = -EINVAL; |
72d94861 | 1541 | ti->error = "Invalid IV mode"; |
28513fcc | 1542 | goto bad; |
1da177e4 LT |
1543 | } |
1544 | ||
28513fcc MB |
1545 | /* Allocate IV */ |
1546 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1547 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1548 | if (ret < 0) { | |
1549 | ti->error = "Error creating IV"; | |
1550 | goto bad; | |
1551 | } | |
1552 | } | |
1da177e4 | 1553 | |
28513fcc MB |
1554 | /* Initialize IV (set keys for ESSIV etc) */ |
1555 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1556 | ret = cc->iv_gen_ops->init(cc); | |
1557 | if (ret < 0) { | |
1558 | ti->error = "Error initialising IV"; | |
1559 | goto bad; | |
1560 | } | |
b95bf2d3 MB |
1561 | } |
1562 | ||
5ebaee6d MB |
1563 | ret = 0; |
1564 | bad: | |
1565 | kfree(cipher_api); | |
1566 | return ret; | |
1567 | ||
1568 | bad_mem: | |
1569 | ti->error = "Cannot allocate cipher strings"; | |
1570 | return -ENOMEM; | |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | * Construct an encryption mapping: | |
1575 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1576 | */ | |
1577 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1578 | { | |
1579 | struct crypt_config *cc; | |
772ae5f5 | 1580 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1581 | unsigned long long tmpll; |
1582 | int ret; | |
772ae5f5 MB |
1583 | struct dm_arg_set as; |
1584 | const char *opt_string; | |
31998ef1 | 1585 | char dummy; |
772ae5f5 MB |
1586 | |
1587 | static struct dm_arg _args[] = { | |
1588 | {0, 1, "Invalid number of feature args"}, | |
1589 | }; | |
5ebaee6d | 1590 | |
772ae5f5 | 1591 | if (argc < 5) { |
5ebaee6d MB |
1592 | ti->error = "Not enough arguments"; |
1593 | return -EINVAL; | |
1da177e4 LT |
1594 | } |
1595 | ||
5ebaee6d MB |
1596 | key_size = strlen(argv[1]) >> 1; |
1597 | ||
1598 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1599 | if (!cc) { | |
1600 | ti->error = "Cannot allocate encryption context"; | |
1601 | return -ENOMEM; | |
1602 | } | |
69a8cfcd | 1603 | cc->key_size = key_size; |
5ebaee6d MB |
1604 | |
1605 | ti->private = cc; | |
1606 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1607 | if (ret < 0) | |
1608 | goto bad; | |
1609 | ||
28513fcc | 1610 | ret = -ENOMEM; |
93d2341c | 1611 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1612 | if (!cc->io_pool) { |
72d94861 | 1613 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1614 | goto bad; |
1da177e4 LT |
1615 | } |
1616 | ||
ddd42edf | 1617 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1618 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1619 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1620 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1621 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1622 | |
1623 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1624 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1625 | if (!cc->req_pool) { | |
1626 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1627 | goto bad; |
ddd42edf | 1628 | } |
ddd42edf | 1629 | |
a19b27ce | 1630 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1631 | if (!cc->page_pool) { |
72d94861 | 1632 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1633 | goto bad; |
1da177e4 LT |
1634 | } |
1635 | ||
bb799ca0 | 1636 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1637 | if (!cc->bs) { |
1638 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1639 | goto bad; |
6a24c718 MB |
1640 | } |
1641 | ||
28513fcc | 1642 | ret = -EINVAL; |
31998ef1 | 1643 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1644 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1645 | goto bad; |
1da177e4 | 1646 | } |
4ee218cd | 1647 | cc->iv_offset = tmpll; |
1da177e4 | 1648 | |
28513fcc MB |
1649 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1650 | ti->error = "Device lookup failed"; | |
1651 | goto bad; | |
1652 | } | |
1653 | ||
31998ef1 | 1654 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1655 | ti->error = "Invalid device sector"; |
28513fcc | 1656 | goto bad; |
1da177e4 | 1657 | } |
4ee218cd | 1658 | cc->start = tmpll; |
1da177e4 | 1659 | |
772ae5f5 MB |
1660 | argv += 5; |
1661 | argc -= 5; | |
1662 | ||
1663 | /* Optional parameters */ | |
1664 | if (argc) { | |
1665 | as.argc = argc; | |
1666 | as.argv = argv; | |
1667 | ||
1668 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1669 | if (ret) | |
1670 | goto bad; | |
1671 | ||
1672 | opt_string = dm_shift_arg(&as); | |
1673 | ||
1674 | if (opt_params == 1 && opt_string && | |
1675 | !strcasecmp(opt_string, "allow_discards")) | |
1676 | ti->num_discard_requests = 1; | |
1677 | else if (opt_params) { | |
1678 | ret = -EINVAL; | |
1679 | ti->error = "Invalid feature arguments"; | |
1680 | goto bad; | |
1681 | } | |
1682 | } | |
1683 | ||
28513fcc | 1684 | ret = -ENOMEM; |
c0297721 AK |
1685 | cc->io_queue = alloc_workqueue("kcryptd_io", |
1686 | WQ_NON_REENTRANT| | |
1687 | WQ_MEM_RECLAIM, | |
1688 | 1); | |
cabf08e4 MB |
1689 | if (!cc->io_queue) { |
1690 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1691 | goto bad; |
cabf08e4 MB |
1692 | } |
1693 | ||
c0297721 AK |
1694 | cc->crypt_queue = alloc_workqueue("kcryptd", |
1695 | WQ_NON_REENTRANT| | |
1696 | WQ_CPU_INTENSIVE| | |
1697 | WQ_MEM_RECLAIM, | |
1698 | 1); | |
cabf08e4 | 1699 | if (!cc->crypt_queue) { |
9934a8be | 1700 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1701 | goto bad; |
9934a8be MB |
1702 | } |
1703 | ||
647c7db1 | 1704 | ti->num_flush_requests = 1; |
983c7db3 MB |
1705 | ti->discard_zeroes_data_unsupported = 1; |
1706 | ||
1da177e4 LT |
1707 | return 0; |
1708 | ||
28513fcc MB |
1709 | bad: |
1710 | crypt_dtr(ti); | |
1711 | return ret; | |
1da177e4 LT |
1712 | } |
1713 | ||
1da177e4 LT |
1714 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
1715 | union map_info *map_context) | |
1716 | { | |
028867ac | 1717 | struct dm_crypt_io *io; |
647c7db1 MP |
1718 | struct crypt_config *cc; |
1719 | ||
772ae5f5 MB |
1720 | /* |
1721 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1722 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1723 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1724 | */ | |
1725 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 MP |
1726 | cc = ti->private; |
1727 | bio->bi_bdev = cc->dev->bdev; | |
772ae5f5 MB |
1728 | if (bio_sectors(bio)) |
1729 | bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); | |
647c7db1 MP |
1730 | return DM_MAPIO_REMAPPED; |
1731 | } | |
1da177e4 | 1732 | |
b441a262 | 1733 | io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1734 | |
20c82538 MB |
1735 | if (bio_data_dir(io->base_bio) == READ) { |
1736 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1737 | kcryptd_queue_io(io); | |
1738 | } else | |
cabf08e4 | 1739 | kcryptd_queue_crypt(io); |
1da177e4 | 1740 | |
d2a7ad29 | 1741 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1742 | } |
1743 | ||
1744 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
1745 | char *result, unsigned int maxlen) | |
1746 | { | |
5ebaee6d | 1747 | struct crypt_config *cc = ti->private; |
1da177e4 LT |
1748 | unsigned int sz = 0; |
1749 | ||
1750 | switch (type) { | |
1751 | case STATUSTYPE_INFO: | |
1752 | result[0] = '\0'; | |
1753 | break; | |
1754 | ||
1755 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1756 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 LT |
1757 | |
1758 | if (cc->key_size > 0) { | |
1759 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
1760 | return -ENOMEM; | |
1761 | ||
1762 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
1763 | sz += cc->key_size << 1; | |
1764 | } else { | |
1765 | if (sz >= maxlen) | |
1766 | return -ENOMEM; | |
1767 | result[sz++] = '-'; | |
1768 | } | |
1769 | ||
4ee218cd AM |
1770 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1771 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 MB |
1772 | |
1773 | if (ti->num_discard_requests) | |
1774 | DMEMIT(" 1 allow_discards"); | |
1775 | ||
1da177e4 LT |
1776 | break; |
1777 | } | |
1778 | return 0; | |
1779 | } | |
1780 | ||
e48d4bbf MB |
1781 | static void crypt_postsuspend(struct dm_target *ti) |
1782 | { | |
1783 | struct crypt_config *cc = ti->private; | |
1784 | ||
1785 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1786 | } | |
1787 | ||
1788 | static int crypt_preresume(struct dm_target *ti) | |
1789 | { | |
1790 | struct crypt_config *cc = ti->private; | |
1791 | ||
1792 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1793 | DMERR("aborting resume - crypt key is not set."); | |
1794 | return -EAGAIN; | |
1795 | } | |
1796 | ||
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | static void crypt_resume(struct dm_target *ti) | |
1801 | { | |
1802 | struct crypt_config *cc = ti->private; | |
1803 | ||
1804 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1805 | } | |
1806 | ||
1807 | /* Message interface | |
1808 | * key set <key> | |
1809 | * key wipe | |
1810 | */ | |
1811 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1812 | { | |
1813 | struct crypt_config *cc = ti->private; | |
542da317 | 1814 | int ret = -EINVAL; |
e48d4bbf MB |
1815 | |
1816 | if (argc < 2) | |
1817 | goto error; | |
1818 | ||
498f0103 | 1819 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1820 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1821 | DMWARN("not suspended during key manipulation."); | |
1822 | return -EINVAL; | |
1823 | } | |
498f0103 | 1824 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1825 | ret = crypt_set_key(cc, argv[2]); |
1826 | if (ret) | |
1827 | return ret; | |
1828 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1829 | ret = cc->iv_gen_ops->init(cc); | |
1830 | return ret; | |
1831 | } | |
498f0103 | 1832 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1833 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1834 | ret = cc->iv_gen_ops->wipe(cc); | |
1835 | if (ret) | |
1836 | return ret; | |
1837 | } | |
e48d4bbf | 1838 | return crypt_wipe_key(cc); |
542da317 | 1839 | } |
e48d4bbf MB |
1840 | } |
1841 | ||
1842 | error: | |
1843 | DMWARN("unrecognised message received."); | |
1844 | return -EINVAL; | |
1845 | } | |
1846 | ||
d41e26b9 MB |
1847 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1848 | struct bio_vec *biovec, int max_size) | |
1849 | { | |
1850 | struct crypt_config *cc = ti->private; | |
1851 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1852 | ||
1853 | if (!q->merge_bvec_fn) | |
1854 | return max_size; | |
1855 | ||
1856 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1857 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1858 | |
1859 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1860 | } | |
1861 | ||
af4874e0 MS |
1862 | static int crypt_iterate_devices(struct dm_target *ti, |
1863 | iterate_devices_callout_fn fn, void *data) | |
1864 | { | |
1865 | struct crypt_config *cc = ti->private; | |
1866 | ||
5dea271b | 1867 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1868 | } |
1869 | ||
1da177e4 LT |
1870 | static struct target_type crypt_target = { |
1871 | .name = "crypt", | |
772ae5f5 | 1872 | .version = {1, 11, 0}, |
1da177e4 LT |
1873 | .module = THIS_MODULE, |
1874 | .ctr = crypt_ctr, | |
1875 | .dtr = crypt_dtr, | |
1876 | .map = crypt_map, | |
1877 | .status = crypt_status, | |
e48d4bbf MB |
1878 | .postsuspend = crypt_postsuspend, |
1879 | .preresume = crypt_preresume, | |
1880 | .resume = crypt_resume, | |
1881 | .message = crypt_message, | |
d41e26b9 | 1882 | .merge = crypt_merge, |
af4874e0 | 1883 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1884 | }; |
1885 | ||
1886 | static int __init dm_crypt_init(void) | |
1887 | { | |
1888 | int r; | |
1889 | ||
028867ac | 1890 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1891 | if (!_crypt_io_pool) |
1892 | return -ENOMEM; | |
1893 | ||
1da177e4 LT |
1894 | r = dm_register_target(&crypt_target); |
1895 | if (r < 0) { | |
72d94861 | 1896 | DMERR("register failed %d", r); |
9934a8be | 1897 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1898 | } |
1899 | ||
1da177e4 LT |
1900 | return r; |
1901 | } | |
1902 | ||
1903 | static void __exit dm_crypt_exit(void) | |
1904 | { | |
10d3bd09 | 1905 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1906 | kmem_cache_destroy(_crypt_io_pool); |
1907 | } | |
1908 | ||
1909 | module_init(dm_crypt_init); | |
1910 | module_exit(dm_crypt_exit); | |
1911 | ||
1912 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1913 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1914 | MODULE_LICENSE("GPL"); |