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> |
60063497 | 21 | #include <linux/atomic.h> |
378f058c | 22 | #include <linux/scatterlist.h> |
1da177e4 | 23 | #include <asm/page.h> |
48527fa7 | 24 | #include <asm/unaligned.h> |
34745785 MB |
25 | #include <crypto/hash.h> |
26 | #include <crypto/md5.h> | |
27 | #include <crypto/algapi.h> | |
1da177e4 | 28 | |
586e80e6 | 29 | #include <linux/device-mapper.h> |
1da177e4 | 30 | |
72d94861 | 31 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 32 | |
1da177e4 LT |
33 | /* |
34 | * context holding the current state of a multi-part conversion | |
35 | */ | |
36 | struct convert_context { | |
43d69034 | 37 | struct completion restart; |
1da177e4 LT |
38 | struct bio *bio_in; |
39 | struct bio *bio_out; | |
40 | unsigned int offset_in; | |
41 | unsigned int offset_out; | |
42 | unsigned int idx_in; | |
43 | unsigned int idx_out; | |
c66029f4 | 44 | sector_t cc_sector; |
40b6229b | 45 | atomic_t cc_pending; |
019c8ec9 | 46 | struct ablkcipher_request *req; |
1da177e4 LT |
47 | }; |
48 | ||
53017030 MB |
49 | /* |
50 | * per bio private data | |
51 | */ | |
52 | struct dm_crypt_io { | |
49a8a920 | 53 | struct crypt_config *cc; |
53017030 MB |
54 | struct bio *base_bio; |
55 | struct work_struct work; | |
56 | ||
57 | struct convert_context ctx; | |
58 | ||
40b6229b | 59 | atomic_t io_pending; |
53017030 | 60 | int error; |
0c395b0f | 61 | sector_t sector; |
393b47ef | 62 | struct dm_crypt_io *base_io; |
53017030 MB |
63 | }; |
64 | ||
01482b76 | 65 | struct dm_crypt_request { |
b2174eeb | 66 | struct convert_context *ctx; |
01482b76 MB |
67 | struct scatterlist sg_in; |
68 | struct scatterlist sg_out; | |
2dc5327d | 69 | sector_t iv_sector; |
01482b76 MB |
70 | }; |
71 | ||
1da177e4 LT |
72 | struct crypt_config; |
73 | ||
74 | struct crypt_iv_operations { | |
75 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 76 | const char *opts); |
1da177e4 | 77 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 78 | int (*init)(struct crypt_config *cc); |
542da317 | 79 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
80 | int (*generator)(struct crypt_config *cc, u8 *iv, |
81 | struct dm_crypt_request *dmreq); | |
82 | int (*post)(struct crypt_config *cc, u8 *iv, | |
83 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
84 | }; |
85 | ||
60473592 | 86 | struct iv_essiv_private { |
b95bf2d3 MB |
87 | struct crypto_hash *hash_tfm; |
88 | u8 *salt; | |
60473592 MB |
89 | }; |
90 | ||
91 | struct iv_benbi_private { | |
92 | int shift; | |
93 | }; | |
94 | ||
34745785 MB |
95 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
96 | struct iv_lmk_private { | |
97 | struct crypto_shash *hash_tfm; | |
98 | u8 *seed; | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Crypt: maps a linear range of a block device | |
103 | * and encrypts / decrypts at the same time. | |
104 | */ | |
e48d4bbf | 105 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
106 | |
107 | /* | |
019c8ec9 | 108 | * The fields in here must be read only after initialization. |
c0297721 | 109 | */ |
1da177e4 LT |
110 | struct crypt_config { |
111 | struct dm_dev *dev; | |
112 | sector_t start; | |
113 | ||
114 | /* | |
ddd42edf MB |
115 | * pool for per bio private data, crypto requests and |
116 | * encryption requeusts/buffer pages | |
1da177e4 LT |
117 | */ |
118 | mempool_t *io_pool; | |
ddd42edf | 119 | mempool_t *req_pool; |
1da177e4 | 120 | mempool_t *page_pool; |
6a24c718 | 121 | struct bio_set *bs; |
1da177e4 | 122 | |
cabf08e4 MB |
123 | struct workqueue_struct *io_queue; |
124 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 125 | |
5ebaee6d | 126 | char *cipher; |
7dbcd137 | 127 | char *cipher_string; |
5ebaee6d | 128 | |
1da177e4 | 129 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 130 | union { |
60473592 MB |
131 | struct iv_essiv_private essiv; |
132 | struct iv_benbi_private benbi; | |
34745785 | 133 | struct iv_lmk_private lmk; |
79066ad3 | 134 | } iv_gen_private; |
1da177e4 LT |
135 | sector_t iv_offset; |
136 | unsigned int iv_size; | |
137 | ||
fd2d231f MP |
138 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
139 | void *iv_private; | |
140 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 141 | unsigned tfms_count; |
c0297721 | 142 | |
ddd42edf MB |
143 | /* |
144 | * Layout of each crypto request: | |
145 | * | |
146 | * struct ablkcipher_request | |
147 | * context | |
148 | * padding | |
149 | * struct dm_crypt_request | |
150 | * padding | |
151 | * IV | |
152 | * | |
153 | * The padding is added so that dm_crypt_request and the IV are | |
154 | * correctly aligned. | |
155 | */ | |
156 | unsigned int dmreq_start; | |
ddd42edf | 157 | |
e48d4bbf | 158 | unsigned long flags; |
1da177e4 | 159 | unsigned int key_size; |
d1f96423 | 160 | unsigned int key_parts; |
1da177e4 LT |
161 | u8 key[0]; |
162 | }; | |
163 | ||
6a24c718 | 164 | #define MIN_IOS 16 |
1da177e4 | 165 | #define MIN_POOL_PAGES 32 |
1da177e4 | 166 | |
e18b890b | 167 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 168 | |
028867ac | 169 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 170 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 171 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 172 | |
c0297721 AK |
173 | /* |
174 | * Use this to access cipher attributes that are the same for each CPU. | |
175 | */ | |
176 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
177 | { | |
fd2d231f | 178 | return cc->tfms[0]; |
c0297721 AK |
179 | } |
180 | ||
1da177e4 LT |
181 | /* |
182 | * Different IV generation algorithms: | |
183 | * | |
3c164bd8 | 184 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 185 | * number, padded with zeros if necessary. |
1da177e4 | 186 | * |
61afef61 MB |
187 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
188 | * number, padded with zeros if necessary. | |
189 | * | |
3c164bd8 RS |
190 | * essiv: "encrypted sector|salt initial vector", the sector number is |
191 | * encrypted with the bulk cipher using a salt as key. The salt | |
192 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 193 | * |
48527fa7 RS |
194 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
195 | * (needed for LRW-32-AES and possible other narrow block modes) | |
196 | * | |
46b47730 LN |
197 | * null: the initial vector is always zero. Provides compatibility with |
198 | * obsolete loop_fish2 devices. Do not use for new devices. | |
199 | * | |
34745785 MB |
200 | * lmk: Compatible implementation of the block chaining mode used |
201 | * by the Loop-AES block device encryption system | |
202 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
203 | * It operates on full 512 byte sectors and uses CBC | |
204 | * with an IV derived from the sector number, the data and | |
205 | * optionally extra IV seed. | |
206 | * This means that after decryption the first block | |
207 | * of sector must be tweaked according to decrypted data. | |
208 | * Loop-AES can use three encryption schemes: | |
209 | * version 1: is plain aes-cbc mode | |
210 | * version 2: uses 64 multikey scheme with lmk IV generator | |
211 | * version 3: the same as version 2 with additional IV seed | |
212 | * (it uses 65 keys, last key is used as IV seed) | |
213 | * | |
1da177e4 LT |
214 | * plumb: unimplemented, see: |
215 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
216 | */ | |
217 | ||
2dc5327d MB |
218 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
219 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
220 | { |
221 | memset(iv, 0, cc->iv_size); | |
283a8328 | 222 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
223 | |
224 | return 0; | |
225 | } | |
226 | ||
61afef61 | 227 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 228 | struct dm_crypt_request *dmreq) |
61afef61 MB |
229 | { |
230 | memset(iv, 0, cc->iv_size); | |
283a8328 | 231 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
232 | |
233 | return 0; | |
234 | } | |
235 | ||
b95bf2d3 MB |
236 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
237 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
238 | { | |
239 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
240 | struct hash_desc desc; | |
241 | struct scatterlist sg; | |
c0297721 | 242 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 243 | int err; |
b95bf2d3 MB |
244 | |
245 | sg_init_one(&sg, cc->key, cc->key_size); | |
246 | desc.tfm = essiv->hash_tfm; | |
247 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
248 | ||
249 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
250 | if (err) | |
251 | return err; | |
252 | ||
fd2d231f | 253 | essiv_tfm = cc->iv_private; |
c0297721 | 254 | |
fd2d231f MP |
255 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
256 | crypto_hash_digestsize(essiv->hash_tfm)); | |
257 | if (err) | |
258 | return err; | |
c0297721 AK |
259 | |
260 | return 0; | |
b95bf2d3 MB |
261 | } |
262 | ||
542da317 MB |
263 | /* Wipe salt and reset key derived from volume key */ |
264 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
265 | { | |
266 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
267 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 268 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 269 | int r, err = 0; |
542da317 MB |
270 | |
271 | memset(essiv->salt, 0, salt_size); | |
272 | ||
fd2d231f MP |
273 | essiv_tfm = cc->iv_private; |
274 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
275 | if (r) | |
276 | err = r; | |
c0297721 AK |
277 | |
278 | return err; | |
279 | } | |
280 | ||
281 | /* Set up per cpu cipher state */ | |
282 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
283 | struct dm_target *ti, | |
284 | u8 *salt, unsigned saltsize) | |
285 | { | |
286 | struct crypto_cipher *essiv_tfm; | |
287 | int err; | |
288 | ||
289 | /* Setup the essiv_tfm with the given salt */ | |
290 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
291 | if (IS_ERR(essiv_tfm)) { | |
292 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
293 | return essiv_tfm; | |
294 | } | |
295 | ||
296 | if (crypto_cipher_blocksize(essiv_tfm) != | |
297 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
298 | ti->error = "Block size of ESSIV cipher does " | |
299 | "not match IV size of block cipher"; | |
300 | crypto_free_cipher(essiv_tfm); | |
301 | return ERR_PTR(-EINVAL); | |
302 | } | |
303 | ||
304 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
305 | if (err) { | |
306 | ti->error = "Failed to set key for ESSIV cipher"; | |
307 | crypto_free_cipher(essiv_tfm); | |
308 | return ERR_PTR(err); | |
309 | } | |
310 | ||
311 | return essiv_tfm; | |
542da317 MB |
312 | } |
313 | ||
60473592 MB |
314 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
315 | { | |
c0297721 | 316 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
317 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
318 | ||
b95bf2d3 MB |
319 | crypto_free_hash(essiv->hash_tfm); |
320 | essiv->hash_tfm = NULL; | |
321 | ||
322 | kzfree(essiv->salt); | |
323 | essiv->salt = NULL; | |
c0297721 | 324 | |
fd2d231f | 325 | essiv_tfm = cc->iv_private; |
c0297721 | 326 | |
fd2d231f MP |
327 | if (essiv_tfm) |
328 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 329 | |
fd2d231f | 330 | cc->iv_private = NULL; |
60473592 MB |
331 | } |
332 | ||
1da177e4 | 333 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 334 | const char *opts) |
1da177e4 | 335 | { |
5861f1be MB |
336 | struct crypto_cipher *essiv_tfm = NULL; |
337 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 338 | u8 *salt = NULL; |
fd2d231f | 339 | int err; |
1da177e4 | 340 | |
5861f1be | 341 | if (!opts) { |
72d94861 | 342 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
343 | return -EINVAL; |
344 | } | |
345 | ||
b95bf2d3 | 346 | /* Allocate hash algorithm */ |
35058687 HX |
347 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
348 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 349 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
350 | err = PTR_ERR(hash_tfm); |
351 | goto bad; | |
1da177e4 LT |
352 | } |
353 | ||
b95bf2d3 | 354 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 355 | if (!salt) { |
72d94861 | 356 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
357 | err = -ENOMEM; |
358 | goto bad; | |
1da177e4 LT |
359 | } |
360 | ||
b95bf2d3 | 361 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
362 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
363 | ||
fd2d231f MP |
364 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
365 | crypto_hash_digestsize(hash_tfm)); | |
366 | if (IS_ERR(essiv_tfm)) { | |
367 | crypt_iv_essiv_dtr(cc); | |
368 | return PTR_ERR(essiv_tfm); | |
c0297721 | 369 | } |
fd2d231f | 370 | cc->iv_private = essiv_tfm; |
c0297721 | 371 | |
1da177e4 | 372 | return 0; |
5861f1be MB |
373 | |
374 | bad: | |
5861f1be MB |
375 | if (hash_tfm && !IS_ERR(hash_tfm)) |
376 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 377 | kfree(salt); |
5861f1be | 378 | return err; |
1da177e4 LT |
379 | } |
380 | ||
2dc5327d MB |
381 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
382 | struct dm_crypt_request *dmreq) | |
1da177e4 | 383 | { |
fd2d231f | 384 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 385 | |
1da177e4 | 386 | memset(iv, 0, cc->iv_size); |
283a8328 | 387 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
388 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
389 | ||
1da177e4 LT |
390 | return 0; |
391 | } | |
392 | ||
48527fa7 RS |
393 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
394 | const char *opts) | |
395 | { | |
c0297721 | 396 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 397 | int log = ilog2(bs); |
48527fa7 RS |
398 | |
399 | /* we need to calculate how far we must shift the sector count | |
400 | * to get the cipher block count, we use this shift in _gen */ | |
401 | ||
402 | if (1 << log != bs) { | |
403 | ti->error = "cypher blocksize is not a power of 2"; | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | if (log > 9) { | |
408 | ti->error = "cypher blocksize is > 512"; | |
409 | return -EINVAL; | |
410 | } | |
411 | ||
60473592 | 412 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
413 | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
418 | { | |
48527fa7 RS |
419 | } |
420 | ||
2dc5327d MB |
421 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
422 | struct dm_crypt_request *dmreq) | |
48527fa7 | 423 | { |
79066ad3 HX |
424 | __be64 val; |
425 | ||
48527fa7 | 426 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 427 | |
2dc5327d | 428 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 429 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 430 | |
1da177e4 LT |
431 | return 0; |
432 | } | |
433 | ||
2dc5327d MB |
434 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
435 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
436 | { |
437 | memset(iv, 0, cc->iv_size); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
34745785 MB |
442 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
443 | { | |
444 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
445 | ||
446 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
447 | crypto_free_shash(lmk->hash_tfm); | |
448 | lmk->hash_tfm = NULL; | |
449 | ||
450 | kzfree(lmk->seed); | |
451 | lmk->seed = NULL; | |
452 | } | |
453 | ||
454 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
455 | const char *opts) | |
456 | { | |
457 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
458 | ||
459 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
460 | if (IS_ERR(lmk->hash_tfm)) { | |
461 | ti->error = "Error initializing LMK hash"; | |
462 | return PTR_ERR(lmk->hash_tfm); | |
463 | } | |
464 | ||
465 | /* No seed in LMK version 2 */ | |
466 | if (cc->key_parts == cc->tfms_count) { | |
467 | lmk->seed = NULL; | |
468 | return 0; | |
469 | } | |
470 | ||
471 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
472 | if (!lmk->seed) { | |
473 | crypt_iv_lmk_dtr(cc); | |
474 | ti->error = "Error kmallocing seed storage in LMK"; | |
475 | return -ENOMEM; | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
482 | { | |
483 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
484 | int subkey_size = cc->key_size / cc->key_parts; | |
485 | ||
486 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
487 | if (lmk->seed) | |
488 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
489 | crypto_shash_digestsize(lmk->hash_tfm)); | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
495 | { | |
496 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
497 | ||
498 | if (lmk->seed) | |
499 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
505 | struct dm_crypt_request *dmreq, | |
506 | u8 *data) | |
507 | { | |
508 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
509 | struct { | |
510 | struct shash_desc desc; | |
511 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
512 | } sdesc; | |
513 | struct md5_state md5state; | |
514 | u32 buf[4]; | |
515 | int i, r; | |
516 | ||
517 | sdesc.desc.tfm = lmk->hash_tfm; | |
518 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
519 | ||
520 | r = crypto_shash_init(&sdesc.desc); | |
521 | if (r) | |
522 | return r; | |
523 | ||
524 | if (lmk->seed) { | |
525 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
526 | if (r) | |
527 | return r; | |
528 | } | |
529 | ||
530 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
531 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
532 | if (r) | |
533 | return r; | |
534 | ||
535 | /* Sector is cropped to 56 bits here */ | |
536 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
537 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
538 | buf[2] = cpu_to_le32(4024); | |
539 | buf[3] = 0; | |
540 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
541 | if (r) | |
542 | return r; | |
543 | ||
544 | /* No MD5 padding here */ | |
545 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
546 | if (r) | |
547 | return r; | |
548 | ||
549 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
550 | __cpu_to_le32s(&md5state.hash[i]); | |
551 | memcpy(iv, &md5state.hash, cc->iv_size); | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
557 | struct dm_crypt_request *dmreq) | |
558 | { | |
559 | u8 *src; | |
560 | int r = 0; | |
561 | ||
562 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 563 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 564 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 565 | kunmap_atomic(src); |
34745785 MB |
566 | } else |
567 | memset(iv, 0, cc->iv_size); | |
568 | ||
569 | return r; | |
570 | } | |
571 | ||
572 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
573 | struct dm_crypt_request *dmreq) | |
574 | { | |
575 | u8 *dst; | |
576 | int r; | |
577 | ||
578 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
579 | return 0; | |
580 | ||
c2e022cb | 581 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
582 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
583 | ||
584 | /* Tweak the first block of plaintext sector */ | |
585 | if (!r) | |
586 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
587 | ||
c2e022cb | 588 | kunmap_atomic(dst); |
34745785 MB |
589 | return r; |
590 | } | |
591 | ||
1da177e4 LT |
592 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
593 | .generator = crypt_iv_plain_gen | |
594 | }; | |
595 | ||
61afef61 MB |
596 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
597 | .generator = crypt_iv_plain64_gen | |
598 | }; | |
599 | ||
1da177e4 LT |
600 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
601 | .ctr = crypt_iv_essiv_ctr, | |
602 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 603 | .init = crypt_iv_essiv_init, |
542da317 | 604 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
605 | .generator = crypt_iv_essiv_gen |
606 | }; | |
607 | ||
48527fa7 RS |
608 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
609 | .ctr = crypt_iv_benbi_ctr, | |
610 | .dtr = crypt_iv_benbi_dtr, | |
611 | .generator = crypt_iv_benbi_gen | |
612 | }; | |
1da177e4 | 613 | |
46b47730 LN |
614 | static struct crypt_iv_operations crypt_iv_null_ops = { |
615 | .generator = crypt_iv_null_gen | |
616 | }; | |
617 | ||
34745785 MB |
618 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
619 | .ctr = crypt_iv_lmk_ctr, | |
620 | .dtr = crypt_iv_lmk_dtr, | |
621 | .init = crypt_iv_lmk_init, | |
622 | .wipe = crypt_iv_lmk_wipe, | |
623 | .generator = crypt_iv_lmk_gen, | |
624 | .post = crypt_iv_lmk_post | |
625 | }; | |
626 | ||
d469f841 MB |
627 | static void crypt_convert_init(struct crypt_config *cc, |
628 | struct convert_context *ctx, | |
629 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 630 | sector_t sector) |
1da177e4 LT |
631 | { |
632 | ctx->bio_in = bio_in; | |
633 | ctx->bio_out = bio_out; | |
634 | ctx->offset_in = 0; | |
635 | ctx->offset_out = 0; | |
636 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
637 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
c66029f4 | 638 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 639 | init_completion(&ctx->restart); |
1da177e4 LT |
640 | } |
641 | ||
b2174eeb HY |
642 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
643 | struct ablkcipher_request *req) | |
644 | { | |
645 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
646 | } | |
647 | ||
648 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
649 | struct dm_crypt_request *dmreq) | |
650 | { | |
651 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
652 | } | |
653 | ||
2dc5327d MB |
654 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
655 | struct dm_crypt_request *dmreq) | |
656 | { | |
657 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
658 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
659 | } | |
660 | ||
01482b76 | 661 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
662 | struct convert_context *ctx, |
663 | struct ablkcipher_request *req) | |
01482b76 MB |
664 | { |
665 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
666 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
667 | struct dm_crypt_request *dmreq; |
668 | u8 *iv; | |
40b6229b | 669 | int r; |
3a7f6c99 | 670 | |
b2174eeb | 671 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 672 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 673 | |
c66029f4 | 674 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 675 | dmreq->ctx = ctx; |
3a7f6c99 MB |
676 | sg_init_table(&dmreq->sg_in, 1); |
677 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
678 | bv_in->bv_offset + ctx->offset_in); |
679 | ||
3a7f6c99 MB |
680 | sg_init_table(&dmreq->sg_out, 1); |
681 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
682 | bv_out->bv_offset + ctx->offset_out); |
683 | ||
684 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
685 | if (ctx->offset_in >= bv_in->bv_len) { | |
686 | ctx->offset_in = 0; | |
687 | ctx->idx_in++; | |
688 | } | |
689 | ||
690 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
691 | if (ctx->offset_out >= bv_out->bv_len) { | |
692 | ctx->offset_out = 0; | |
693 | ctx->idx_out++; | |
694 | } | |
695 | ||
3a7f6c99 | 696 | if (cc->iv_gen_ops) { |
2dc5327d | 697 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
698 | if (r < 0) |
699 | return r; | |
700 | } | |
701 | ||
702 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
703 | 1 << SECTOR_SHIFT, iv); | |
704 | ||
705 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
706 | r = crypto_ablkcipher_encrypt(req); | |
707 | else | |
708 | r = crypto_ablkcipher_decrypt(req); | |
709 | ||
2dc5327d MB |
710 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
711 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
712 | ||
3a7f6c99 | 713 | return r; |
01482b76 MB |
714 | } |
715 | ||
95497a96 MB |
716 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
717 | int error); | |
c0297721 | 718 | |
ddd42edf MB |
719 | static void crypt_alloc_req(struct crypt_config *cc, |
720 | struct convert_context *ctx) | |
721 | { | |
c66029f4 | 722 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 723 | |
019c8ec9 MP |
724 | if (!ctx->req) |
725 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 726 | |
019c8ec9 MP |
727 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
728 | ablkcipher_request_set_callback(ctx->req, | |
c0297721 | 729 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
019c8ec9 | 730 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
731 | } |
732 | ||
1da177e4 LT |
733 | /* |
734 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
735 | */ | |
736 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 737 | struct convert_context *ctx) |
1da177e4 | 738 | { |
3f1e9070 | 739 | int r; |
1da177e4 | 740 | |
40b6229b | 741 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 742 | |
1da177e4 LT |
743 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
744 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 745 | |
3a7f6c99 MB |
746 | crypt_alloc_req(cc, ctx); |
747 | ||
40b6229b | 748 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 749 | |
019c8ec9 | 750 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
751 | |
752 | switch (r) { | |
3f1e9070 | 753 | /* async */ |
3a7f6c99 MB |
754 | case -EBUSY: |
755 | wait_for_completion(&ctx->restart); | |
756 | INIT_COMPLETION(ctx->restart); | |
757 | /* fall through*/ | |
758 | case -EINPROGRESS: | |
019c8ec9 | 759 | ctx->req = NULL; |
c66029f4 | 760 | ctx->cc_sector++; |
3f1e9070 MB |
761 | continue; |
762 | ||
763 | /* sync */ | |
3a7f6c99 | 764 | case 0: |
40b6229b | 765 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 766 | ctx->cc_sector++; |
c7f1b204 | 767 | cond_resched(); |
3a7f6c99 | 768 | continue; |
3a7f6c99 | 769 | |
3f1e9070 MB |
770 | /* error */ |
771 | default: | |
40b6229b | 772 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
773 | return r; |
774 | } | |
1da177e4 LT |
775 | } |
776 | ||
3f1e9070 | 777 | return 0; |
1da177e4 LT |
778 | } |
779 | ||
780 | /* | |
781 | * Generate a new unfragmented bio with the given size | |
782 | * This should never violate the device limitations | |
933f01d4 MB |
783 | * May return a smaller bio when running out of pages, indicated by |
784 | * *out_of_pages set to 1. | |
1da177e4 | 785 | */ |
933f01d4 MB |
786 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
787 | unsigned *out_of_pages) | |
1da177e4 | 788 | { |
49a8a920 | 789 | struct crypt_config *cc = io->cc; |
8b004457 | 790 | struct bio *clone; |
1da177e4 | 791 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 792 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
793 | unsigned i, len; |
794 | struct page *page; | |
1da177e4 | 795 | |
2f9941b6 | 796 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 797 | if (!clone) |
1da177e4 | 798 | return NULL; |
1da177e4 | 799 | |
027581f3 | 800 | clone_init(io, clone); |
933f01d4 | 801 | *out_of_pages = 0; |
6a24c718 | 802 | |
f97380bc | 803 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 804 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
805 | if (!page) { |
806 | *out_of_pages = 1; | |
1da177e4 | 807 | break; |
933f01d4 | 808 | } |
1da177e4 LT |
809 | |
810 | /* | |
aeb2deae MP |
811 | * If additional pages cannot be allocated without waiting, |
812 | * return a partially-allocated bio. The caller will then try | |
813 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 814 | */ |
aeb2deae | 815 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 816 | |
91e10625 MB |
817 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
818 | ||
819 | if (!bio_add_page(clone, page, len, 0)) { | |
820 | mempool_free(page, cc->page_pool); | |
821 | break; | |
822 | } | |
1da177e4 | 823 | |
91e10625 | 824 | size -= len; |
1da177e4 LT |
825 | } |
826 | ||
8b004457 MB |
827 | if (!clone->bi_size) { |
828 | bio_put(clone); | |
1da177e4 LT |
829 | return NULL; |
830 | } | |
831 | ||
8b004457 | 832 | return clone; |
1da177e4 LT |
833 | } |
834 | ||
644bd2f0 | 835 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 836 | { |
644bd2f0 | 837 | unsigned int i; |
1da177e4 LT |
838 | struct bio_vec *bv; |
839 | ||
cb34e057 | 840 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
841 | BUG_ON(!bv->bv_page); |
842 | mempool_free(bv->bv_page, cc->page_pool); | |
843 | bv->bv_page = NULL; | |
844 | } | |
845 | } | |
846 | ||
49a8a920 | 847 | static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc, |
dc440d1e MB |
848 | struct bio *bio, sector_t sector) |
849 | { | |
dc440d1e MB |
850 | struct dm_crypt_io *io; |
851 | ||
852 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
49a8a920 | 853 | io->cc = cc; |
dc440d1e MB |
854 | io->base_bio = bio; |
855 | io->sector = sector; | |
856 | io->error = 0; | |
393b47ef | 857 | io->base_io = NULL; |
019c8ec9 | 858 | io->ctx.req = NULL; |
40b6229b | 859 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
860 | |
861 | return io; | |
862 | } | |
863 | ||
3e1a8bdd MB |
864 | static void crypt_inc_pending(struct dm_crypt_io *io) |
865 | { | |
40b6229b | 866 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
867 | } |
868 | ||
1da177e4 LT |
869 | /* |
870 | * One of the bios was finished. Check for completion of | |
871 | * the whole request and correctly clean up the buffer. | |
393b47ef | 872 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 873 | */ |
5742fd77 | 874 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 875 | { |
49a8a920 | 876 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
877 | struct bio *base_bio = io->base_bio; |
878 | struct dm_crypt_io *base_io = io->base_io; | |
879 | int error = io->error; | |
1da177e4 | 880 | |
40b6229b | 881 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
882 | return; |
883 | ||
019c8ec9 MP |
884 | if (io->ctx.req) |
885 | mempool_free(io->ctx.req, cc->req_pool); | |
b35f8caa MB |
886 | mempool_free(io, cc->io_pool); |
887 | ||
888 | if (likely(!base_io)) | |
889 | bio_endio(base_bio, error); | |
393b47ef | 890 | else { |
b35f8caa MB |
891 | if (error && !base_io->error) |
892 | base_io->error = error; | |
893 | crypt_dec_pending(base_io); | |
393b47ef | 894 | } |
1da177e4 LT |
895 | } |
896 | ||
897 | /* | |
cabf08e4 | 898 | * kcryptd/kcryptd_io: |
1da177e4 LT |
899 | * |
900 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 901 | * interrupt context. |
cabf08e4 MB |
902 | * |
903 | * kcryptd performs the actual encryption or decryption. | |
904 | * | |
905 | * kcryptd_io performs the IO submission. | |
906 | * | |
907 | * They must be separated as otherwise the final stages could be | |
908 | * starved by new requests which can block in the first stages due | |
909 | * to memory allocation. | |
c0297721 AK |
910 | * |
911 | * The work is done per CPU global for all dm-crypt instances. | |
912 | * They should not depend on each other and do not block. | |
1da177e4 | 913 | */ |
6712ecf8 | 914 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 915 | { |
028867ac | 916 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 917 | struct crypt_config *cc = io->cc; |
ee7a491e | 918 | unsigned rw = bio_data_dir(clone); |
8b004457 | 919 | |
adfe4770 MB |
920 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
921 | error = -EIO; | |
922 | ||
8b004457 | 923 | /* |
6712ecf8 | 924 | * free the processed pages |
8b004457 | 925 | */ |
ee7a491e | 926 | if (rw == WRITE) |
644bd2f0 | 927 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
928 | |
929 | bio_put(clone); | |
8b004457 | 930 | |
ee7a491e MB |
931 | if (rw == READ && !error) { |
932 | kcryptd_queue_crypt(io); | |
933 | return; | |
934 | } | |
5742fd77 MB |
935 | |
936 | if (unlikely(error)) | |
937 | io->error = error; | |
938 | ||
939 | crypt_dec_pending(io); | |
8b004457 MB |
940 | } |
941 | ||
028867ac | 942 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 943 | { |
49a8a920 | 944 | struct crypt_config *cc = io->cc; |
8b004457 MB |
945 | |
946 | clone->bi_private = io; | |
947 | clone->bi_end_io = crypt_endio; | |
948 | clone->bi_bdev = cc->dev->bdev; | |
949 | clone->bi_rw = io->base_bio->bi_rw; | |
950 | } | |
951 | ||
20c82538 | 952 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 953 | { |
49a8a920 | 954 | struct crypt_config *cc = io->cc; |
8b004457 MB |
955 | struct bio *base_bio = io->base_bio; |
956 | struct bio *clone; | |
93e605c2 | 957 | |
8b004457 MB |
958 | /* |
959 | * The block layer might modify the bvec array, so always | |
960 | * copy the required bvecs because we need the original | |
961 | * one in order to decrypt the whole bio data *afterwards*. | |
962 | */ | |
bf800ef1 | 963 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 964 | if (!clone) |
20c82538 | 965 | return 1; |
8b004457 | 966 | |
20c82538 MB |
967 | crypt_inc_pending(io); |
968 | ||
8b004457 | 969 | clone_init(io, clone); |
0c395b0f | 970 | clone->bi_sector = cc->start + io->sector; |
8b004457 | 971 | |
93e605c2 | 972 | generic_make_request(clone); |
20c82538 | 973 | return 0; |
8b004457 MB |
974 | } |
975 | ||
4e4eef64 MB |
976 | static void kcryptd_io_write(struct dm_crypt_io *io) |
977 | { | |
95497a96 | 978 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 979 | generic_make_request(clone); |
4e4eef64 MB |
980 | } |
981 | ||
395b167c AK |
982 | static void kcryptd_io(struct work_struct *work) |
983 | { | |
984 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
985 | ||
20c82538 MB |
986 | if (bio_data_dir(io->base_bio) == READ) { |
987 | crypt_inc_pending(io); | |
988 | if (kcryptd_io_read(io, GFP_NOIO)) | |
989 | io->error = -ENOMEM; | |
990 | crypt_dec_pending(io); | |
991 | } else | |
395b167c AK |
992 | kcryptd_io_write(io); |
993 | } | |
994 | ||
995 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
996 | { | |
49a8a920 | 997 | struct crypt_config *cc = io->cc; |
395b167c AK |
998 | |
999 | INIT_WORK(&io->work, kcryptd_io); | |
1000 | queue_work(cc->io_queue, &io->work); | |
1001 | } | |
1002 | ||
72c6e7af | 1003 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1004 | { |
dec1cedf | 1005 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1006 | struct crypt_config *cc = io->cc; |
dec1cedf | 1007 | |
72c6e7af | 1008 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1009 | crypt_free_buffer_pages(cc, clone); |
1010 | bio_put(clone); | |
6c031f41 | 1011 | crypt_dec_pending(io); |
dec1cedf MB |
1012 | return; |
1013 | } | |
1014 | ||
1015 | /* crypt_convert should have filled the clone bio */ | |
1016 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1017 | ||
1018 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1019 | |
95497a96 MB |
1020 | if (async) |
1021 | kcryptd_queue_io(io); | |
1e37bb8e | 1022 | else |
95497a96 | 1023 | generic_make_request(clone); |
4e4eef64 MB |
1024 | } |
1025 | ||
fc5a5e9a | 1026 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1027 | { |
49a8a920 | 1028 | struct crypt_config *cc = io->cc; |
8b004457 | 1029 | struct bio *clone; |
393b47ef | 1030 | struct dm_crypt_io *new_io; |
c8081618 | 1031 | int crypt_finished; |
933f01d4 | 1032 | unsigned out_of_pages = 0; |
dec1cedf | 1033 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1034 | sector_t sector = io->sector; |
dec1cedf | 1035 | int r; |
8b004457 | 1036 | |
fc5a5e9a MB |
1037 | /* |
1038 | * Prevent io from disappearing until this function completes. | |
1039 | */ | |
1040 | crypt_inc_pending(io); | |
b635b00e | 1041 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1042 | |
93e605c2 MB |
1043 | /* |
1044 | * The allocated buffers can be smaller than the whole bio, | |
1045 | * so repeat the whole process until all the data can be handled. | |
1046 | */ | |
1047 | while (remaining) { | |
933f01d4 | 1048 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1049 | if (unlikely(!clone)) { |
5742fd77 | 1050 | io->error = -ENOMEM; |
fc5a5e9a | 1051 | break; |
23541d2d | 1052 | } |
93e605c2 | 1053 | |
53017030 MB |
1054 | io->ctx.bio_out = clone; |
1055 | io->ctx.idx_out = 0; | |
93e605c2 | 1056 | |
dec1cedf | 1057 | remaining -= clone->bi_size; |
b635b00e | 1058 | sector += bio_sectors(clone); |
93e605c2 | 1059 | |
4e594098 | 1060 | crypt_inc_pending(io); |
72c6e7af | 1061 | |
dec1cedf | 1062 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1063 | if (r < 0) |
1064 | io->error = -EIO; | |
1065 | ||
40b6229b | 1066 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1067 | |
c8081618 MB |
1068 | /* Encryption was already finished, submit io now */ |
1069 | if (crypt_finished) { | |
72c6e7af | 1070 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1071 | |
1072 | /* | |
1073 | * If there was an error, do not try next fragments. | |
1074 | * For async, error is processed in async handler. | |
1075 | */ | |
6c031f41 | 1076 | if (unlikely(r < 0)) |
fc5a5e9a | 1077 | break; |
b635b00e MB |
1078 | |
1079 | io->sector = sector; | |
4e594098 | 1080 | } |
93e605c2 | 1081 | |
933f01d4 MB |
1082 | /* |
1083 | * Out of memory -> run queues | |
1084 | * But don't wait if split was due to the io size restriction | |
1085 | */ | |
1086 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1087 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1088 | |
393b47ef MB |
1089 | /* |
1090 | * With async crypto it is unsafe to share the crypto context | |
1091 | * between fragments, so switch to a new dm_crypt_io structure. | |
1092 | */ | |
1093 | if (unlikely(!crypt_finished && remaining)) { | |
49a8a920 | 1094 | new_io = crypt_io_alloc(io->cc, io->base_bio, |
393b47ef MB |
1095 | sector); |
1096 | crypt_inc_pending(new_io); | |
1097 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1098 | io->base_bio, sector); | |
1099 | new_io->ctx.idx_in = io->ctx.idx_in; | |
1100 | new_io->ctx.offset_in = io->ctx.offset_in; | |
1101 | ||
1102 | /* | |
1103 | * Fragments after the first use the base_io | |
1104 | * pending count. | |
1105 | */ | |
1106 | if (!io->base_io) | |
1107 | new_io->base_io = io; | |
1108 | else { | |
1109 | new_io->base_io = io->base_io; | |
1110 | crypt_inc_pending(io->base_io); | |
1111 | crypt_dec_pending(io); | |
1112 | } | |
1113 | ||
1114 | io = new_io; | |
1115 | } | |
93e605c2 | 1116 | } |
899c95d3 MB |
1117 | |
1118 | crypt_dec_pending(io); | |
84131db6 MB |
1119 | } |
1120 | ||
72c6e7af | 1121 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1122 | { |
5742fd77 MB |
1123 | crypt_dec_pending(io); |
1124 | } | |
1125 | ||
4e4eef64 | 1126 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1127 | { |
49a8a920 | 1128 | struct crypt_config *cc = io->cc; |
5742fd77 | 1129 | int r = 0; |
1da177e4 | 1130 | |
3e1a8bdd | 1131 | crypt_inc_pending(io); |
3a7f6c99 | 1132 | |
53017030 | 1133 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1134 | io->sector); |
1da177e4 | 1135 | |
5742fd77 | 1136 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1137 | if (r < 0) |
1138 | io->error = -EIO; | |
5742fd77 | 1139 | |
40b6229b | 1140 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1141 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1142 | |
1143 | crypt_dec_pending(io); | |
1da177e4 LT |
1144 | } |
1145 | ||
95497a96 MB |
1146 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1147 | int error) | |
1148 | { | |
b2174eeb HY |
1149 | struct dm_crypt_request *dmreq = async_req->data; |
1150 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1151 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1152 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1153 | |
1154 | if (error == -EINPROGRESS) { | |
1155 | complete(&ctx->restart); | |
1156 | return; | |
1157 | } | |
1158 | ||
2dc5327d MB |
1159 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1160 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1161 | ||
72c6e7af MP |
1162 | if (error < 0) |
1163 | io->error = -EIO; | |
1164 | ||
b2174eeb | 1165 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 | 1166 | |
40b6229b | 1167 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1168 | return; |
1169 | ||
1170 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1171 | kcryptd_crypt_read_done(io); |
95497a96 | 1172 | else |
72c6e7af | 1173 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1174 | } |
1175 | ||
395b167c | 1176 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1177 | { |
028867ac | 1178 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1179 | |
cabf08e4 | 1180 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1181 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1182 | else |
395b167c | 1183 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1184 | } |
1185 | ||
395b167c | 1186 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1187 | { |
49a8a920 | 1188 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1189 | |
395b167c AK |
1190 | INIT_WORK(&io->work, kcryptd_crypt); |
1191 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | /* | |
1195 | * Decode key from its hex representation | |
1196 | */ | |
1197 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1198 | { | |
1199 | char buffer[3]; | |
1da177e4 LT |
1200 | unsigned int i; |
1201 | ||
1202 | buffer[2] = '\0'; | |
1203 | ||
8b004457 | 1204 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1205 | buffer[0] = *hex++; |
1206 | buffer[1] = *hex++; | |
1207 | ||
1a66a08a | 1208 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1209 | return -EINVAL; |
1210 | } | |
1211 | ||
1212 | if (*hex != '\0') | |
1213 | return -EINVAL; | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
fd2d231f | 1218 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1219 | { |
d1f96423 MB |
1220 | unsigned i; |
1221 | ||
fd2d231f MP |
1222 | if (!cc->tfms) |
1223 | return; | |
1224 | ||
d1f96423 | 1225 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1226 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1227 | crypto_free_ablkcipher(cc->tfms[i]); | |
1228 | cc->tfms[i] = NULL; | |
d1f96423 | 1229 | } |
fd2d231f MP |
1230 | |
1231 | kfree(cc->tfms); | |
1232 | cc->tfms = NULL; | |
d1f96423 MB |
1233 | } |
1234 | ||
fd2d231f | 1235 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1236 | { |
d1f96423 MB |
1237 | unsigned i; |
1238 | int err; | |
1239 | ||
fd2d231f MP |
1240 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1241 | GFP_KERNEL); | |
1242 | if (!cc->tfms) | |
1243 | return -ENOMEM; | |
1244 | ||
d1f96423 | 1245 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1246 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1247 | if (IS_ERR(cc->tfms[i])) { | |
1248 | err = PTR_ERR(cc->tfms[i]); | |
1249 | crypt_free_tfms(cc); | |
d1f96423 MB |
1250 | return err; |
1251 | } | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
c0297721 AK |
1257 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1258 | { | |
d1f96423 | 1259 | unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); |
fd2d231f MP |
1260 | int err = 0, i, r; |
1261 | ||
1262 | for (i = 0; i < cc->tfms_count; i++) { | |
1263 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1264 | cc->key + (i * subkey_size), | |
1265 | subkey_size); | |
1266 | if (r) | |
1267 | err = r; | |
c0297721 AK |
1268 | } |
1269 | ||
1270 | return err; | |
1271 | } | |
1272 | ||
e48d4bbf MB |
1273 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1274 | { | |
de8be5ac MB |
1275 | int r = -EINVAL; |
1276 | int key_string_len = strlen(key); | |
1277 | ||
69a8cfcd | 1278 | /* The key size may not be changed. */ |
de8be5ac MB |
1279 | if (cc->key_size != (key_string_len >> 1)) |
1280 | goto out; | |
e48d4bbf | 1281 | |
69a8cfcd MB |
1282 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1283 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1284 | goto out; |
e48d4bbf | 1285 | |
3044e195 OK |
1286 | /* clear the flag since following operations may invalidate previously valid key */ |
1287 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1288 | ||
69a8cfcd | 1289 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1290 | goto out; |
e48d4bbf | 1291 | |
de8be5ac | 1292 | r = crypt_setkey_allcpus(cc); |
3044e195 OK |
1293 | if (!r) |
1294 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
de8be5ac MB |
1295 | |
1296 | out: | |
1297 | /* Hex key string not needed after here, so wipe it. */ | |
1298 | memset(key, '0', key_string_len); | |
1299 | ||
1300 | return r; | |
e48d4bbf MB |
1301 | } |
1302 | ||
1303 | static int crypt_wipe_key(struct crypt_config *cc) | |
1304 | { | |
1305 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1306 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1307 | |
1308 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1309 | } |
1310 | ||
28513fcc MB |
1311 | static void crypt_dtr(struct dm_target *ti) |
1312 | { | |
1313 | struct crypt_config *cc = ti->private; | |
1314 | ||
1315 | ti->private = NULL; | |
1316 | ||
1317 | if (!cc) | |
1318 | return; | |
1319 | ||
1320 | if (cc->io_queue) | |
1321 | destroy_workqueue(cc->io_queue); | |
1322 | if (cc->crypt_queue) | |
1323 | destroy_workqueue(cc->crypt_queue); | |
1324 | ||
fd2d231f MP |
1325 | crypt_free_tfms(cc); |
1326 | ||
28513fcc MB |
1327 | if (cc->bs) |
1328 | bioset_free(cc->bs); | |
1329 | ||
1330 | if (cc->page_pool) | |
1331 | mempool_destroy(cc->page_pool); | |
1332 | if (cc->req_pool) | |
1333 | mempool_destroy(cc->req_pool); | |
1334 | if (cc->io_pool) | |
1335 | mempool_destroy(cc->io_pool); | |
1336 | ||
1337 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1338 | cc->iv_gen_ops->dtr(cc); | |
1339 | ||
28513fcc MB |
1340 | if (cc->dev) |
1341 | dm_put_device(ti, cc->dev); | |
1342 | ||
5ebaee6d | 1343 | kzfree(cc->cipher); |
7dbcd137 | 1344 | kzfree(cc->cipher_string); |
28513fcc MB |
1345 | |
1346 | /* Must zero key material before freeing */ | |
1347 | kzfree(cc); | |
1348 | } | |
1349 | ||
5ebaee6d MB |
1350 | static int crypt_ctr_cipher(struct dm_target *ti, |
1351 | char *cipher_in, char *key) | |
1da177e4 | 1352 | { |
5ebaee6d | 1353 | struct crypt_config *cc = ti->private; |
d1f96423 | 1354 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1355 | char *cipher_api = NULL; |
fd2d231f | 1356 | int ret = -EINVAL; |
31998ef1 | 1357 | char dummy; |
1da177e4 | 1358 | |
5ebaee6d MB |
1359 | /* Convert to crypto api definition? */ |
1360 | if (strchr(cipher_in, '(')) { | |
1361 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1362 | return -EINVAL; |
1363 | } | |
1364 | ||
7dbcd137 MB |
1365 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1366 | if (!cc->cipher_string) | |
1367 | goto bad_mem; | |
1368 | ||
5ebaee6d MB |
1369 | /* |
1370 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1371 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1372 | */ |
1373 | tmp = cipher_in; | |
d1f96423 MB |
1374 | keycount = strsep(&tmp, "-"); |
1375 | cipher = strsep(&keycount, ":"); | |
1376 | ||
1377 | if (!keycount) | |
1378 | cc->tfms_count = 1; | |
31998ef1 | 1379 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1380 | !is_power_of_2(cc->tfms_count)) { |
1381 | ti->error = "Bad cipher key count specification"; | |
1382 | return -EINVAL; | |
1383 | } | |
1384 | cc->key_parts = cc->tfms_count; | |
5ebaee6d MB |
1385 | |
1386 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1387 | if (!cc->cipher) | |
1388 | goto bad_mem; | |
1389 | ||
1da177e4 LT |
1390 | chainmode = strsep(&tmp, "-"); |
1391 | ivopts = strsep(&tmp, "-"); | |
1392 | ivmode = strsep(&ivopts, ":"); | |
1393 | ||
1394 | if (tmp) | |
5ebaee6d | 1395 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1396 | |
7dbcd137 MB |
1397 | /* |
1398 | * For compatibility with the original dm-crypt mapping format, if | |
1399 | * only the cipher name is supplied, use cbc-plain. | |
1400 | */ | |
5ebaee6d | 1401 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1402 | chainmode = "cbc"; |
1403 | ivmode = "plain"; | |
1404 | } | |
1405 | ||
d1806f6a | 1406 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1407 | ti->error = "IV mechanism required"; |
1408 | return -EINVAL; | |
1da177e4 LT |
1409 | } |
1410 | ||
5ebaee6d MB |
1411 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1412 | if (!cipher_api) | |
1413 | goto bad_mem; | |
1414 | ||
1415 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1416 | "%s(%s)", chainmode, cipher); | |
1417 | if (ret < 0) { | |
1418 | kfree(cipher_api); | |
1419 | goto bad_mem; | |
1da177e4 LT |
1420 | } |
1421 | ||
5ebaee6d | 1422 | /* Allocate cipher */ |
fd2d231f MP |
1423 | ret = crypt_alloc_tfms(cc, cipher_api); |
1424 | if (ret < 0) { | |
1425 | ti->error = "Error allocating crypto tfm"; | |
1426 | goto bad; | |
1da177e4 | 1427 | } |
1da177e4 | 1428 | |
5ebaee6d MB |
1429 | /* Initialize and set key */ |
1430 | ret = crypt_set_key(cc, key); | |
28513fcc | 1431 | if (ret < 0) { |
0b430958 | 1432 | ti->error = "Error decoding and setting key"; |
28513fcc | 1433 | goto bad; |
0b430958 MB |
1434 | } |
1435 | ||
5ebaee6d | 1436 | /* Initialize IV */ |
c0297721 | 1437 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1438 | if (cc->iv_size) |
1439 | /* at least a 64 bit sector number should fit in our buffer */ | |
1440 | cc->iv_size = max(cc->iv_size, | |
1441 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1442 | else if (ivmode) { | |
1443 | DMWARN("Selected cipher does not support IVs"); | |
1444 | ivmode = NULL; | |
1445 | } | |
1446 | ||
1447 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1448 | if (ivmode == NULL) |
1449 | cc->iv_gen_ops = NULL; | |
1450 | else if (strcmp(ivmode, "plain") == 0) | |
1451 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1452 | else if (strcmp(ivmode, "plain64") == 0) |
1453 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1454 | else if (strcmp(ivmode, "essiv") == 0) |
1455 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1456 | else if (strcmp(ivmode, "benbi") == 0) |
1457 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1458 | else if (strcmp(ivmode, "null") == 0) |
1459 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1460 | else if (strcmp(ivmode, "lmk") == 0) { |
1461 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
1462 | /* Version 2 and 3 is recognised according | |
1463 | * to length of provided multi-key string. | |
1464 | * If present (version 3), last key is used as IV seed. | |
1465 | */ | |
1466 | if (cc->key_size % cc->key_parts) | |
1467 | cc->key_parts++; | |
1468 | } else { | |
5ebaee6d | 1469 | ret = -EINVAL; |
72d94861 | 1470 | ti->error = "Invalid IV mode"; |
28513fcc | 1471 | goto bad; |
1da177e4 LT |
1472 | } |
1473 | ||
28513fcc MB |
1474 | /* Allocate IV */ |
1475 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1476 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1477 | if (ret < 0) { | |
1478 | ti->error = "Error creating IV"; | |
1479 | goto bad; | |
1480 | } | |
1481 | } | |
1da177e4 | 1482 | |
28513fcc MB |
1483 | /* Initialize IV (set keys for ESSIV etc) */ |
1484 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1485 | ret = cc->iv_gen_ops->init(cc); | |
1486 | if (ret < 0) { | |
1487 | ti->error = "Error initialising IV"; | |
1488 | goto bad; | |
1489 | } | |
b95bf2d3 MB |
1490 | } |
1491 | ||
5ebaee6d MB |
1492 | ret = 0; |
1493 | bad: | |
1494 | kfree(cipher_api); | |
1495 | return ret; | |
1496 | ||
1497 | bad_mem: | |
1498 | ti->error = "Cannot allocate cipher strings"; | |
1499 | return -ENOMEM; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Construct an encryption mapping: | |
1504 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1505 | */ | |
1506 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1507 | { | |
1508 | struct crypt_config *cc; | |
772ae5f5 | 1509 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1510 | unsigned long long tmpll; |
1511 | int ret; | |
d283ad1a | 1512 | size_t iv_size_padding; |
772ae5f5 MB |
1513 | struct dm_arg_set as; |
1514 | const char *opt_string; | |
31998ef1 | 1515 | char dummy; |
772ae5f5 MB |
1516 | |
1517 | static struct dm_arg _args[] = { | |
1518 | {0, 1, "Invalid number of feature args"}, | |
1519 | }; | |
5ebaee6d | 1520 | |
772ae5f5 | 1521 | if (argc < 5) { |
5ebaee6d MB |
1522 | ti->error = "Not enough arguments"; |
1523 | return -EINVAL; | |
1da177e4 LT |
1524 | } |
1525 | ||
5ebaee6d MB |
1526 | key_size = strlen(argv[1]) >> 1; |
1527 | ||
1528 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1529 | if (!cc) { | |
1530 | ti->error = "Cannot allocate encryption context"; | |
1531 | return -ENOMEM; | |
1532 | } | |
69a8cfcd | 1533 | cc->key_size = key_size; |
5ebaee6d MB |
1534 | |
1535 | ti->private = cc; | |
1536 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1537 | if (ret < 0) | |
1538 | goto bad; | |
1539 | ||
28513fcc | 1540 | ret = -ENOMEM; |
93d2341c | 1541 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1542 | if (!cc->io_pool) { |
72d94861 | 1543 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1544 | goto bad; |
1da177e4 LT |
1545 | } |
1546 | ||
ddd42edf | 1547 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1548 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
d283ad1a MP |
1549 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1550 | ||
1551 | if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { | |
1552 | /* Allocate the padding exactly */ | |
1553 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
1554 | & crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1555 | } else { | |
1556 | /* | |
1557 | * If the cipher requires greater alignment than kmalloc | |
1558 | * alignment, we don't know the exact position of the | |
1559 | * initialization vector. We must assume worst case. | |
1560 | */ | |
1561 | iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1562 | } | |
ddd42edf MB |
1563 | |
1564 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
d283ad1a | 1565 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1566 | if (!cc->req_pool) { |
1567 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1568 | goto bad; |
ddd42edf | 1569 | } |
ddd42edf | 1570 | |
a19b27ce | 1571 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1572 | if (!cc->page_pool) { |
72d94861 | 1573 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1574 | goto bad; |
1da177e4 LT |
1575 | } |
1576 | ||
bb799ca0 | 1577 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1578 | if (!cc->bs) { |
1579 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1580 | goto bad; |
6a24c718 MB |
1581 | } |
1582 | ||
28513fcc | 1583 | ret = -EINVAL; |
31998ef1 | 1584 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1585 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1586 | goto bad; |
1da177e4 | 1587 | } |
4ee218cd | 1588 | cc->iv_offset = tmpll; |
1da177e4 | 1589 | |
28513fcc MB |
1590 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1591 | ti->error = "Device lookup failed"; | |
1592 | goto bad; | |
1593 | } | |
1594 | ||
31998ef1 | 1595 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1596 | ti->error = "Invalid device sector"; |
28513fcc | 1597 | goto bad; |
1da177e4 | 1598 | } |
4ee218cd | 1599 | cc->start = tmpll; |
1da177e4 | 1600 | |
772ae5f5 MB |
1601 | argv += 5; |
1602 | argc -= 5; | |
1603 | ||
1604 | /* Optional parameters */ | |
1605 | if (argc) { | |
1606 | as.argc = argc; | |
1607 | as.argv = argv; | |
1608 | ||
1609 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1610 | if (ret) | |
1611 | goto bad; | |
1612 | ||
1613 | opt_string = dm_shift_arg(&as); | |
1614 | ||
1615 | if (opt_params == 1 && opt_string && | |
1616 | !strcasecmp(opt_string, "allow_discards")) | |
55a62eef | 1617 | ti->num_discard_bios = 1; |
772ae5f5 MB |
1618 | else if (opt_params) { |
1619 | ret = -EINVAL; | |
1620 | ti->error = "Invalid feature arguments"; | |
1621 | goto bad; | |
1622 | } | |
1623 | } | |
1624 | ||
28513fcc | 1625 | ret = -ENOMEM; |
c0297721 AK |
1626 | cc->io_queue = alloc_workqueue("kcryptd_io", |
1627 | WQ_NON_REENTRANT| | |
1628 | WQ_MEM_RECLAIM, | |
1629 | 1); | |
cabf08e4 MB |
1630 | if (!cc->io_queue) { |
1631 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1632 | goto bad; |
cabf08e4 MB |
1633 | } |
1634 | ||
c0297721 AK |
1635 | cc->crypt_queue = alloc_workqueue("kcryptd", |
1636 | WQ_NON_REENTRANT| | |
1637 | WQ_CPU_INTENSIVE| | |
1638 | WQ_MEM_RECLAIM, | |
1639 | 1); | |
cabf08e4 | 1640 | if (!cc->crypt_queue) { |
9934a8be | 1641 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1642 | goto bad; |
9934a8be MB |
1643 | } |
1644 | ||
55a62eef | 1645 | ti->num_flush_bios = 1; |
0ac55489 | 1646 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1647 | |
1da177e4 LT |
1648 | return 0; |
1649 | ||
28513fcc MB |
1650 | bad: |
1651 | crypt_dtr(ti); | |
1652 | return ret; | |
1da177e4 LT |
1653 | } |
1654 | ||
7de3ee57 | 1655 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1656 | { |
028867ac | 1657 | struct dm_crypt_io *io; |
49a8a920 | 1658 | struct crypt_config *cc = ti->private; |
647c7db1 | 1659 | |
772ae5f5 MB |
1660 | /* |
1661 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1662 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1663 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1664 | */ | |
1665 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1666 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 MB |
1667 | if (bio_sectors(bio)) |
1668 | bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); | |
647c7db1 MP |
1669 | return DM_MAPIO_REMAPPED; |
1670 | } | |
1da177e4 | 1671 | |
49a8a920 | 1672 | io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1673 | |
20c82538 MB |
1674 | if (bio_data_dir(io->base_bio) == READ) { |
1675 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1676 | kcryptd_queue_io(io); | |
1677 | } else | |
cabf08e4 | 1678 | kcryptd_queue_crypt(io); |
1da177e4 | 1679 | |
d2a7ad29 | 1680 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1681 | } |
1682 | ||
fd7c092e MP |
1683 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1684 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1685 | { |
5ebaee6d | 1686 | struct crypt_config *cc = ti->private; |
fd7c092e | 1687 | unsigned i, sz = 0; |
1da177e4 LT |
1688 | |
1689 | switch (type) { | |
1690 | case STATUSTYPE_INFO: | |
1691 | result[0] = '\0'; | |
1692 | break; | |
1693 | ||
1694 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1695 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1696 | |
fd7c092e MP |
1697 | if (cc->key_size > 0) |
1698 | for (i = 0; i < cc->key_size; i++) | |
1699 | DMEMIT("%02x", cc->key[i]); | |
1700 | else | |
1701 | DMEMIT("-"); | |
1da177e4 | 1702 | |
4ee218cd AM |
1703 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1704 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1705 | |
55a62eef | 1706 | if (ti->num_discard_bios) |
772ae5f5 MB |
1707 | DMEMIT(" 1 allow_discards"); |
1708 | ||
1da177e4 LT |
1709 | break; |
1710 | } | |
1da177e4 LT |
1711 | } |
1712 | ||
e48d4bbf MB |
1713 | static void crypt_postsuspend(struct dm_target *ti) |
1714 | { | |
1715 | struct crypt_config *cc = ti->private; | |
1716 | ||
1717 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1718 | } | |
1719 | ||
1720 | static int crypt_preresume(struct dm_target *ti) | |
1721 | { | |
1722 | struct crypt_config *cc = ti->private; | |
1723 | ||
1724 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1725 | DMERR("aborting resume - crypt key is not set."); | |
1726 | return -EAGAIN; | |
1727 | } | |
1728 | ||
1729 | return 0; | |
1730 | } | |
1731 | ||
1732 | static void crypt_resume(struct dm_target *ti) | |
1733 | { | |
1734 | struct crypt_config *cc = ti->private; | |
1735 | ||
1736 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1737 | } | |
1738 | ||
1739 | /* Message interface | |
1740 | * key set <key> | |
1741 | * key wipe | |
1742 | */ | |
1743 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1744 | { | |
1745 | struct crypt_config *cc = ti->private; | |
542da317 | 1746 | int ret = -EINVAL; |
e48d4bbf MB |
1747 | |
1748 | if (argc < 2) | |
1749 | goto error; | |
1750 | ||
498f0103 | 1751 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1752 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1753 | DMWARN("not suspended during key manipulation."); | |
1754 | return -EINVAL; | |
1755 | } | |
498f0103 | 1756 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1757 | ret = crypt_set_key(cc, argv[2]); |
1758 | if (ret) | |
1759 | return ret; | |
1760 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1761 | ret = cc->iv_gen_ops->init(cc); | |
1762 | return ret; | |
1763 | } | |
498f0103 | 1764 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1765 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1766 | ret = cc->iv_gen_ops->wipe(cc); | |
1767 | if (ret) | |
1768 | return ret; | |
1769 | } | |
e48d4bbf | 1770 | return crypt_wipe_key(cc); |
542da317 | 1771 | } |
e48d4bbf MB |
1772 | } |
1773 | ||
1774 | error: | |
1775 | DMWARN("unrecognised message received."); | |
1776 | return -EINVAL; | |
1777 | } | |
1778 | ||
d41e26b9 MB |
1779 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1780 | struct bio_vec *biovec, int max_size) | |
1781 | { | |
1782 | struct crypt_config *cc = ti->private; | |
1783 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1784 | ||
1785 | if (!q->merge_bvec_fn) | |
1786 | return max_size; | |
1787 | ||
1788 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1789 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1790 | |
1791 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1792 | } | |
1793 | ||
af4874e0 MS |
1794 | static int crypt_iterate_devices(struct dm_target *ti, |
1795 | iterate_devices_callout_fn fn, void *data) | |
1796 | { | |
1797 | struct crypt_config *cc = ti->private; | |
1798 | ||
5dea271b | 1799 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1800 | } |
1801 | ||
1da177e4 LT |
1802 | static struct target_type crypt_target = { |
1803 | .name = "crypt", | |
fd7c092e | 1804 | .version = {1, 12, 1}, |
1da177e4 LT |
1805 | .module = THIS_MODULE, |
1806 | .ctr = crypt_ctr, | |
1807 | .dtr = crypt_dtr, | |
1808 | .map = crypt_map, | |
1809 | .status = crypt_status, | |
e48d4bbf MB |
1810 | .postsuspend = crypt_postsuspend, |
1811 | .preresume = crypt_preresume, | |
1812 | .resume = crypt_resume, | |
1813 | .message = crypt_message, | |
d41e26b9 | 1814 | .merge = crypt_merge, |
af4874e0 | 1815 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1816 | }; |
1817 | ||
1818 | static int __init dm_crypt_init(void) | |
1819 | { | |
1820 | int r; | |
1821 | ||
028867ac | 1822 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1823 | if (!_crypt_io_pool) |
1824 | return -ENOMEM; | |
1825 | ||
1da177e4 LT |
1826 | r = dm_register_target(&crypt_target); |
1827 | if (r < 0) { | |
72d94861 | 1828 | DMERR("register failed %d", r); |
9934a8be | 1829 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1830 | } |
1831 | ||
1da177e4 LT |
1832 | return r; |
1833 | } | |
1834 | ||
1835 | static void __exit dm_crypt_exit(void) | |
1836 | { | |
10d3bd09 | 1837 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1838 | kmem_cache_destroy(_crypt_io_pool); |
1839 | } | |
1840 | ||
1841 | module_init(dm_crypt_init); | |
1842 | module_exit(dm_crypt_exit); | |
1843 | ||
1844 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1845 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1846 | MODULE_LICENSE("GPL"); |