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