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Commit | Line | Data |
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1da177e4 | 1 | /* |
bf14299f | 2 | * Copyright (C) 2003 Jana Saout <jana@saout.de> |
1da177e4 | 3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
54cea3f6 | 4 | * Copyright (C) 2006-2015 Red Hat, Inc. All rights reserved. |
ed04d981 | 5 | * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> |
1da177e4 LT |
6 | * |
7 | * This file is released under the GPL. | |
8 | */ | |
9 | ||
43d69034 | 10 | #include <linux/completion.h> |
d1806f6a | 11 | #include <linux/err.h> |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/bio.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/mempool.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/crypto.h> | |
20 | #include <linux/workqueue.h> | |
dc267621 | 21 | #include <linux/kthread.h> |
3fcfab16 | 22 | #include <linux/backing-dev.h> |
60063497 | 23 | #include <linux/atomic.h> |
378f058c | 24 | #include <linux/scatterlist.h> |
b3c5fd30 | 25 | #include <linux/rbtree.h> |
1da177e4 | 26 | #include <asm/page.h> |
48527fa7 | 27 | #include <asm/unaligned.h> |
34745785 MB |
28 | #include <crypto/hash.h> |
29 | #include <crypto/md5.h> | |
30 | #include <crypto/algapi.h> | |
bbdb23b5 | 31 | #include <crypto/skcipher.h> |
1da177e4 | 32 | |
586e80e6 | 33 | #include <linux/device-mapper.h> |
1da177e4 | 34 | |
72d94861 | 35 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 36 | |
1da177e4 LT |
37 | /* |
38 | * context holding the current state of a multi-part conversion | |
39 | */ | |
40 | struct convert_context { | |
43d69034 | 41 | struct completion restart; |
1da177e4 LT |
42 | struct bio *bio_in; |
43 | struct bio *bio_out; | |
003b5c57 KO |
44 | struct bvec_iter iter_in; |
45 | struct bvec_iter iter_out; | |
c66029f4 | 46 | sector_t cc_sector; |
40b6229b | 47 | atomic_t cc_pending; |
bbdb23b5 | 48 | struct skcipher_request *req; |
1da177e4 LT |
49 | }; |
50 | ||
53017030 MB |
51 | /* |
52 | * per bio private data | |
53 | */ | |
54 | struct dm_crypt_io { | |
49a8a920 | 55 | struct crypt_config *cc; |
53017030 MB |
56 | struct bio *base_bio; |
57 | struct work_struct work; | |
58 | ||
59 | struct convert_context ctx; | |
60 | ||
40b6229b | 61 | atomic_t io_pending; |
53017030 | 62 | int error; |
0c395b0f | 63 | sector_t sector; |
dc267621 | 64 | |
b3c5fd30 | 65 | struct rb_node rb_node; |
298a9fa0 | 66 | } CRYPTO_MINALIGN_ATTR; |
53017030 | 67 | |
01482b76 | 68 | struct dm_crypt_request { |
b2174eeb | 69 | struct convert_context *ctx; |
01482b76 MB |
70 | struct scatterlist sg_in; |
71 | struct scatterlist sg_out; | |
2dc5327d | 72 | sector_t iv_sector; |
01482b76 MB |
73 | }; |
74 | ||
1da177e4 LT |
75 | struct crypt_config; |
76 | ||
77 | struct crypt_iv_operations { | |
78 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 79 | const char *opts); |
1da177e4 | 80 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 81 | int (*init)(struct crypt_config *cc); |
542da317 | 82 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
83 | int (*generator)(struct crypt_config *cc, u8 *iv, |
84 | struct dm_crypt_request *dmreq); | |
85 | int (*post)(struct crypt_config *cc, u8 *iv, | |
86 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
87 | }; |
88 | ||
60473592 | 89 | struct iv_essiv_private { |
bbdb23b5 | 90 | struct crypto_ahash *hash_tfm; |
b95bf2d3 | 91 | u8 *salt; |
60473592 MB |
92 | }; |
93 | ||
94 | struct iv_benbi_private { | |
95 | int shift; | |
96 | }; | |
97 | ||
34745785 MB |
98 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
99 | struct iv_lmk_private { | |
100 | struct crypto_shash *hash_tfm; | |
101 | u8 *seed; | |
102 | }; | |
103 | ||
ed04d981 MB |
104 | #define TCW_WHITENING_SIZE 16 |
105 | struct iv_tcw_private { | |
106 | struct crypto_shash *crc32_tfm; | |
107 | u8 *iv_seed; | |
108 | u8 *whitening; | |
109 | }; | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Crypt: maps a linear range of a block device | |
113 | * and encrypts / decrypts at the same time. | |
114 | */ | |
0f5d8e6e | 115 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, |
bcbd94ff MP |
116 | DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD, |
117 | DM_CRYPT_EXIT_THREAD}; | |
c0297721 AK |
118 | |
119 | /* | |
610f2de3 | 120 | * The fields in here must be read only after initialization. |
c0297721 | 121 | */ |
1da177e4 LT |
122 | struct crypt_config { |
123 | struct dm_dev *dev; | |
124 | sector_t start; | |
125 | ||
126 | /* | |
ddd42edf MB |
127 | * pool for per bio private data, crypto requests and |
128 | * encryption requeusts/buffer pages | |
1da177e4 | 129 | */ |
ddd42edf | 130 | mempool_t *req_pool; |
1da177e4 | 131 | mempool_t *page_pool; |
6a24c718 | 132 | struct bio_set *bs; |
7145c241 | 133 | struct mutex bio_alloc_lock; |
1da177e4 | 134 | |
cabf08e4 MB |
135 | struct workqueue_struct *io_queue; |
136 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 137 | |
dc267621 MP |
138 | struct task_struct *write_thread; |
139 | wait_queue_head_t write_thread_wait; | |
b3c5fd30 | 140 | struct rb_root write_tree; |
dc267621 | 141 | |
5ebaee6d | 142 | char *cipher; |
7dbcd137 | 143 | char *cipher_string; |
5ebaee6d | 144 | |
1da177e4 | 145 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 146 | union { |
60473592 MB |
147 | struct iv_essiv_private essiv; |
148 | struct iv_benbi_private benbi; | |
34745785 | 149 | struct iv_lmk_private lmk; |
ed04d981 | 150 | struct iv_tcw_private tcw; |
79066ad3 | 151 | } iv_gen_private; |
1da177e4 LT |
152 | sector_t iv_offset; |
153 | unsigned int iv_size; | |
154 | ||
fd2d231f MP |
155 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
156 | void *iv_private; | |
bbdb23b5 | 157 | struct crypto_skcipher **tfms; |
d1f96423 | 158 | unsigned tfms_count; |
c0297721 | 159 | |
ddd42edf MB |
160 | /* |
161 | * Layout of each crypto request: | |
162 | * | |
bbdb23b5 | 163 | * struct skcipher_request |
ddd42edf MB |
164 | * context |
165 | * padding | |
166 | * struct dm_crypt_request | |
167 | * padding | |
168 | * IV | |
169 | * | |
170 | * The padding is added so that dm_crypt_request and the IV are | |
171 | * correctly aligned. | |
172 | */ | |
173 | unsigned int dmreq_start; | |
ddd42edf | 174 | |
298a9fa0 MP |
175 | unsigned int per_bio_data_size; |
176 | ||
e48d4bbf | 177 | unsigned long flags; |
1da177e4 | 178 | unsigned int key_size; |
da31a078 MB |
179 | unsigned int key_parts; /* independent parts in key buffer */ |
180 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
181 | u8 key[0]; |
182 | }; | |
183 | ||
6a24c718 | 184 | #define MIN_IOS 16 |
1da177e4 | 185 | |
028867ac | 186 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 187 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 188 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 189 | |
c0297721 AK |
190 | /* |
191 | * Use this to access cipher attributes that are the same for each CPU. | |
192 | */ | |
bbdb23b5 | 193 | static struct crypto_skcipher *any_tfm(struct crypt_config *cc) |
c0297721 | 194 | { |
fd2d231f | 195 | return cc->tfms[0]; |
c0297721 AK |
196 | } |
197 | ||
1da177e4 LT |
198 | /* |
199 | * Different IV generation algorithms: | |
200 | * | |
3c164bd8 | 201 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 202 | * number, padded with zeros if necessary. |
1da177e4 | 203 | * |
61afef61 MB |
204 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
205 | * number, padded with zeros if necessary. | |
206 | * | |
3c164bd8 RS |
207 | * essiv: "encrypted sector|salt initial vector", the sector number is |
208 | * encrypted with the bulk cipher using a salt as key. The salt | |
209 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 210 | * |
48527fa7 RS |
211 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
212 | * (needed for LRW-32-AES and possible other narrow block modes) | |
213 | * | |
46b47730 LN |
214 | * null: the initial vector is always zero. Provides compatibility with |
215 | * obsolete loop_fish2 devices. Do not use for new devices. | |
216 | * | |
34745785 MB |
217 | * lmk: Compatible implementation of the block chaining mode used |
218 | * by the Loop-AES block device encryption system | |
219 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
220 | * It operates on full 512 byte sectors and uses CBC | |
221 | * with an IV derived from the sector number, the data and | |
222 | * optionally extra IV seed. | |
223 | * This means that after decryption the first block | |
224 | * of sector must be tweaked according to decrypted data. | |
225 | * Loop-AES can use three encryption schemes: | |
226 | * version 1: is plain aes-cbc mode | |
227 | * version 2: uses 64 multikey scheme with lmk IV generator | |
228 | * version 3: the same as version 2 with additional IV seed | |
229 | * (it uses 65 keys, last key is used as IV seed) | |
230 | * | |
ed04d981 MB |
231 | * tcw: Compatible implementation of the block chaining mode used |
232 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
e44f23b3 | 233 | * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat |
ed04d981 MB |
234 | * It operates on full 512 byte sectors and uses CBC |
235 | * with an IV derived from initial key and the sector number. | |
236 | * In addition, whitening value is applied on every sector, whitening | |
237 | * is calculated from initial key, sector number and mixed using CRC32. | |
238 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
239 | * and should be used for old compatible containers access only. | |
240 | * | |
1da177e4 LT |
241 | * plumb: unimplemented, see: |
242 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
243 | */ | |
244 | ||
2dc5327d MB |
245 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
246 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
247 | { |
248 | memset(iv, 0, cc->iv_size); | |
283a8328 | 249 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
61afef61 | 254 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 255 | struct dm_crypt_request *dmreq) |
61afef61 MB |
256 | { |
257 | memset(iv, 0, cc->iv_size); | |
283a8328 | 258 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
b95bf2d3 MB |
263 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
264 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
265 | { | |
266 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
bbdb23b5 | 267 | AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); |
b95bf2d3 | 268 | struct scatterlist sg; |
c0297721 | 269 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 270 | int err; |
b95bf2d3 MB |
271 | |
272 | sg_init_one(&sg, cc->key, cc->key_size); | |
bbdb23b5 HX |
273 | ahash_request_set_tfm(req, essiv->hash_tfm); |
274 | ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); | |
275 | ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); | |
b95bf2d3 | 276 | |
bbdb23b5 HX |
277 | err = crypto_ahash_digest(req); |
278 | ahash_request_zero(req); | |
b95bf2d3 MB |
279 | if (err) |
280 | return err; | |
281 | ||
fd2d231f | 282 | essiv_tfm = cc->iv_private; |
c0297721 | 283 | |
fd2d231f | 284 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
bbdb23b5 | 285 | crypto_ahash_digestsize(essiv->hash_tfm)); |
fd2d231f MP |
286 | if (err) |
287 | return err; | |
c0297721 AK |
288 | |
289 | return 0; | |
b95bf2d3 MB |
290 | } |
291 | ||
542da317 MB |
292 | /* Wipe salt and reset key derived from volume key */ |
293 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
294 | { | |
295 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
bbdb23b5 | 296 | unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); |
c0297721 | 297 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 298 | int r, err = 0; |
542da317 MB |
299 | |
300 | memset(essiv->salt, 0, salt_size); | |
301 | ||
fd2d231f MP |
302 | essiv_tfm = cc->iv_private; |
303 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
304 | if (r) | |
305 | err = r; | |
c0297721 AK |
306 | |
307 | return err; | |
308 | } | |
309 | ||
310 | /* Set up per cpu cipher state */ | |
311 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
312 | struct dm_target *ti, | |
313 | u8 *salt, unsigned saltsize) | |
314 | { | |
315 | struct crypto_cipher *essiv_tfm; | |
316 | int err; | |
317 | ||
318 | /* Setup the essiv_tfm with the given salt */ | |
319 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
320 | if (IS_ERR(essiv_tfm)) { | |
321 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
322 | return essiv_tfm; | |
323 | } | |
324 | ||
325 | if (crypto_cipher_blocksize(essiv_tfm) != | |
bbdb23b5 | 326 | crypto_skcipher_ivsize(any_tfm(cc))) { |
c0297721 AK |
327 | ti->error = "Block size of ESSIV cipher does " |
328 | "not match IV size of block cipher"; | |
329 | crypto_free_cipher(essiv_tfm); | |
330 | return ERR_PTR(-EINVAL); | |
331 | } | |
332 | ||
333 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
334 | if (err) { | |
335 | ti->error = "Failed to set key for ESSIV cipher"; | |
336 | crypto_free_cipher(essiv_tfm); | |
337 | return ERR_PTR(err); | |
338 | } | |
339 | ||
340 | return essiv_tfm; | |
542da317 MB |
341 | } |
342 | ||
60473592 MB |
343 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
344 | { | |
c0297721 | 345 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
346 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
347 | ||
bbdb23b5 | 348 | crypto_free_ahash(essiv->hash_tfm); |
b95bf2d3 MB |
349 | essiv->hash_tfm = NULL; |
350 | ||
351 | kzfree(essiv->salt); | |
352 | essiv->salt = NULL; | |
c0297721 | 353 | |
fd2d231f | 354 | essiv_tfm = cc->iv_private; |
c0297721 | 355 | |
fd2d231f MP |
356 | if (essiv_tfm) |
357 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 358 | |
fd2d231f | 359 | cc->iv_private = NULL; |
60473592 MB |
360 | } |
361 | ||
1da177e4 | 362 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 363 | const char *opts) |
1da177e4 | 364 | { |
5861f1be | 365 | struct crypto_cipher *essiv_tfm = NULL; |
bbdb23b5 | 366 | struct crypto_ahash *hash_tfm = NULL; |
5861f1be | 367 | u8 *salt = NULL; |
fd2d231f | 368 | int err; |
1da177e4 | 369 | |
5861f1be | 370 | if (!opts) { |
72d94861 | 371 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
372 | return -EINVAL; |
373 | } | |
374 | ||
b95bf2d3 | 375 | /* Allocate hash algorithm */ |
bbdb23b5 | 376 | hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); |
35058687 | 377 | if (IS_ERR(hash_tfm)) { |
72d94861 | 378 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
379 | err = PTR_ERR(hash_tfm); |
380 | goto bad; | |
1da177e4 LT |
381 | } |
382 | ||
bbdb23b5 | 383 | salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 384 | if (!salt) { |
72d94861 | 385 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
386 | err = -ENOMEM; |
387 | goto bad; | |
1da177e4 LT |
388 | } |
389 | ||
b95bf2d3 | 390 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
391 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
392 | ||
fd2d231f | 393 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
bbdb23b5 | 394 | crypto_ahash_digestsize(hash_tfm)); |
fd2d231f MP |
395 | if (IS_ERR(essiv_tfm)) { |
396 | crypt_iv_essiv_dtr(cc); | |
397 | return PTR_ERR(essiv_tfm); | |
c0297721 | 398 | } |
fd2d231f | 399 | cc->iv_private = essiv_tfm; |
c0297721 | 400 | |
1da177e4 | 401 | return 0; |
5861f1be MB |
402 | |
403 | bad: | |
5861f1be | 404 | if (hash_tfm && !IS_ERR(hash_tfm)) |
bbdb23b5 | 405 | crypto_free_ahash(hash_tfm); |
b95bf2d3 | 406 | kfree(salt); |
5861f1be | 407 | return err; |
1da177e4 LT |
408 | } |
409 | ||
2dc5327d MB |
410 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
411 | struct dm_crypt_request *dmreq) | |
1da177e4 | 412 | { |
fd2d231f | 413 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 414 | |
1da177e4 | 415 | memset(iv, 0, cc->iv_size); |
283a8328 | 416 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
417 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
418 | ||
1da177e4 LT |
419 | return 0; |
420 | } | |
421 | ||
48527fa7 RS |
422 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
423 | const char *opts) | |
424 | { | |
bbdb23b5 | 425 | unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 426 | int log = ilog2(bs); |
48527fa7 RS |
427 | |
428 | /* we need to calculate how far we must shift the sector count | |
429 | * to get the cipher block count, we use this shift in _gen */ | |
430 | ||
431 | if (1 << log != bs) { | |
432 | ti->error = "cypher blocksize is not a power of 2"; | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | if (log > 9) { | |
437 | ti->error = "cypher blocksize is > 512"; | |
438 | return -EINVAL; | |
439 | } | |
440 | ||
60473592 | 441 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
447 | { | |
48527fa7 RS |
448 | } |
449 | ||
2dc5327d MB |
450 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
451 | struct dm_crypt_request *dmreq) | |
48527fa7 | 452 | { |
79066ad3 HX |
453 | __be64 val; |
454 | ||
48527fa7 | 455 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 456 | |
2dc5327d | 457 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 458 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 459 | |
1da177e4 LT |
460 | return 0; |
461 | } | |
462 | ||
2dc5327d MB |
463 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
464 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
465 | { |
466 | memset(iv, 0, cc->iv_size); | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
34745785 MB |
471 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
472 | { | |
473 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
474 | ||
475 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
476 | crypto_free_shash(lmk->hash_tfm); | |
477 | lmk->hash_tfm = NULL; | |
478 | ||
479 | kzfree(lmk->seed); | |
480 | lmk->seed = NULL; | |
481 | } | |
482 | ||
483 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
484 | const char *opts) | |
485 | { | |
486 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
487 | ||
488 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
489 | if (IS_ERR(lmk->hash_tfm)) { | |
490 | ti->error = "Error initializing LMK hash"; | |
491 | return PTR_ERR(lmk->hash_tfm); | |
492 | } | |
493 | ||
494 | /* No seed in LMK version 2 */ | |
495 | if (cc->key_parts == cc->tfms_count) { | |
496 | lmk->seed = NULL; | |
497 | return 0; | |
498 | } | |
499 | ||
500 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
501 | if (!lmk->seed) { | |
502 | crypt_iv_lmk_dtr(cc); | |
503 | ti->error = "Error kmallocing seed storage in LMK"; | |
504 | return -ENOMEM; | |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
511 | { | |
512 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
513 | int subkey_size = cc->key_size / cc->key_parts; | |
514 | ||
515 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
516 | if (lmk->seed) | |
517 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
518 | crypto_shash_digestsize(lmk->hash_tfm)); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
524 | { | |
525 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
526 | ||
527 | if (lmk->seed) | |
528 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
534 | struct dm_crypt_request *dmreq, | |
535 | u8 *data) | |
536 | { | |
537 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 538 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 539 | struct md5_state md5state; |
da31a078 | 540 | __le32 buf[4]; |
34745785 MB |
541 | int i, r; |
542 | ||
b6106265 JSM |
543 | desc->tfm = lmk->hash_tfm; |
544 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
34745785 | 545 | |
b6106265 | 546 | r = crypto_shash_init(desc); |
34745785 MB |
547 | if (r) |
548 | return r; | |
549 | ||
550 | if (lmk->seed) { | |
b6106265 | 551 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
552 | if (r) |
553 | return r; | |
554 | } | |
555 | ||
556 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 557 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
558 | if (r) |
559 | return r; | |
560 | ||
561 | /* Sector is cropped to 56 bits here */ | |
562 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
563 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
564 | buf[2] = cpu_to_le32(4024); | |
565 | buf[3] = 0; | |
b6106265 | 566 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
567 | if (r) |
568 | return r; | |
569 | ||
570 | /* No MD5 padding here */ | |
b6106265 | 571 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
572 | if (r) |
573 | return r; | |
574 | ||
575 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
576 | __cpu_to_le32s(&md5state.hash[i]); | |
577 | memcpy(iv, &md5state.hash, cc->iv_size); | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
583 | struct dm_crypt_request *dmreq) | |
584 | { | |
585 | u8 *src; | |
586 | int r = 0; | |
587 | ||
588 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 589 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 590 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 591 | kunmap_atomic(src); |
34745785 MB |
592 | } else |
593 | memset(iv, 0, cc->iv_size); | |
594 | ||
595 | return r; | |
596 | } | |
597 | ||
598 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
599 | struct dm_crypt_request *dmreq) | |
600 | { | |
601 | u8 *dst; | |
602 | int r; | |
603 | ||
604 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
605 | return 0; | |
606 | ||
c2e022cb | 607 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
608 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
609 | ||
610 | /* Tweak the first block of plaintext sector */ | |
611 | if (!r) | |
612 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
613 | ||
c2e022cb | 614 | kunmap_atomic(dst); |
34745785 MB |
615 | return r; |
616 | } | |
617 | ||
ed04d981 MB |
618 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
619 | { | |
620 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
621 | ||
622 | kzfree(tcw->iv_seed); | |
623 | tcw->iv_seed = NULL; | |
624 | kzfree(tcw->whitening); | |
625 | tcw->whitening = NULL; | |
626 | ||
627 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
628 | crypto_free_shash(tcw->crc32_tfm); | |
629 | tcw->crc32_tfm = NULL; | |
630 | } | |
631 | ||
632 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
633 | const char *opts) | |
634 | { | |
635 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
636 | ||
637 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
638 | ti->error = "Wrong key size for TCW"; | |
639 | return -EINVAL; | |
640 | } | |
641 | ||
642 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
643 | if (IS_ERR(tcw->crc32_tfm)) { | |
644 | ti->error = "Error initializing CRC32 in TCW"; | |
645 | return PTR_ERR(tcw->crc32_tfm); | |
646 | } | |
647 | ||
648 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
649 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
650 | if (!tcw->iv_seed || !tcw->whitening) { | |
651 | crypt_iv_tcw_dtr(cc); | |
652 | ti->error = "Error allocating seed storage in TCW"; | |
653 | return -ENOMEM; | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
660 | { | |
661 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
662 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
663 | ||
664 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
665 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
666 | TCW_WHITENING_SIZE); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
672 | { | |
673 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
674 | ||
675 | memset(tcw->iv_seed, 0, cc->iv_size); | |
676 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
682 | struct dm_crypt_request *dmreq, | |
683 | u8 *data) | |
684 | { | |
685 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
350b5393 | 686 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 | 687 | u8 buf[TCW_WHITENING_SIZE]; |
b6106265 | 688 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
689 | int i, r; |
690 | ||
691 | /* xor whitening with sector number */ | |
692 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
693 | crypto_xor(buf, (u8 *)§or, 8); | |
694 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
695 | ||
696 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 JSM |
697 | desc->tfm = tcw->crc32_tfm; |
698 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
ed04d981 | 699 | for (i = 0; i < 4; i++) { |
b6106265 | 700 | r = crypto_shash_init(desc); |
ed04d981 MB |
701 | if (r) |
702 | goto out; | |
b6106265 | 703 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
ed04d981 MB |
704 | if (r) |
705 | goto out; | |
b6106265 | 706 | r = crypto_shash_final(desc, &buf[i * 4]); |
ed04d981 MB |
707 | if (r) |
708 | goto out; | |
709 | } | |
710 | crypto_xor(&buf[0], &buf[12], 4); | |
711 | crypto_xor(&buf[4], &buf[8], 4); | |
712 | ||
713 | /* apply whitening (8 bytes) to whole sector */ | |
714 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
715 | crypto_xor(data + i * 8, buf, 8); | |
716 | out: | |
1a71d6ff | 717 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
718 | return r; |
719 | } | |
720 | ||
721 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
722 | struct dm_crypt_request *dmreq) | |
723 | { | |
724 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
350b5393 | 725 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 MB |
726 | u8 *src; |
727 | int r = 0; | |
728 | ||
729 | /* Remove whitening from ciphertext */ | |
730 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
731 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
732 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
733 | kunmap_atomic(src); | |
734 | } | |
735 | ||
736 | /* Calculate IV */ | |
737 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
738 | crypto_xor(iv, (u8 *)§or, 8); | |
739 | if (cc->iv_size > 8) | |
740 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
741 | ||
742 | return r; | |
743 | } | |
744 | ||
745 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
746 | struct dm_crypt_request *dmreq) | |
747 | { | |
748 | u8 *dst; | |
749 | int r; | |
750 | ||
751 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
752 | return 0; | |
753 | ||
754 | /* Apply whitening on ciphertext */ | |
755 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
756 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
757 | kunmap_atomic(dst); | |
758 | ||
759 | return r; | |
760 | } | |
761 | ||
1da177e4 LT |
762 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
763 | .generator = crypt_iv_plain_gen | |
764 | }; | |
765 | ||
61afef61 MB |
766 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
767 | .generator = crypt_iv_plain64_gen | |
768 | }; | |
769 | ||
1da177e4 LT |
770 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
771 | .ctr = crypt_iv_essiv_ctr, | |
772 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 773 | .init = crypt_iv_essiv_init, |
542da317 | 774 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
775 | .generator = crypt_iv_essiv_gen |
776 | }; | |
777 | ||
48527fa7 RS |
778 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
779 | .ctr = crypt_iv_benbi_ctr, | |
780 | .dtr = crypt_iv_benbi_dtr, | |
781 | .generator = crypt_iv_benbi_gen | |
782 | }; | |
1da177e4 | 783 | |
46b47730 LN |
784 | static struct crypt_iv_operations crypt_iv_null_ops = { |
785 | .generator = crypt_iv_null_gen | |
786 | }; | |
787 | ||
34745785 MB |
788 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
789 | .ctr = crypt_iv_lmk_ctr, | |
790 | .dtr = crypt_iv_lmk_dtr, | |
791 | .init = crypt_iv_lmk_init, | |
792 | .wipe = crypt_iv_lmk_wipe, | |
793 | .generator = crypt_iv_lmk_gen, | |
794 | .post = crypt_iv_lmk_post | |
795 | }; | |
796 | ||
ed04d981 MB |
797 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
798 | .ctr = crypt_iv_tcw_ctr, | |
799 | .dtr = crypt_iv_tcw_dtr, | |
800 | .init = crypt_iv_tcw_init, | |
801 | .wipe = crypt_iv_tcw_wipe, | |
802 | .generator = crypt_iv_tcw_gen, | |
803 | .post = crypt_iv_tcw_post | |
804 | }; | |
805 | ||
d469f841 MB |
806 | static void crypt_convert_init(struct crypt_config *cc, |
807 | struct convert_context *ctx, | |
808 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 809 | sector_t sector) |
1da177e4 LT |
810 | { |
811 | ctx->bio_in = bio_in; | |
812 | ctx->bio_out = bio_out; | |
003b5c57 KO |
813 | if (bio_in) |
814 | ctx->iter_in = bio_in->bi_iter; | |
815 | if (bio_out) | |
816 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 817 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 818 | init_completion(&ctx->restart); |
1da177e4 LT |
819 | } |
820 | ||
b2174eeb | 821 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
bbdb23b5 | 822 | struct skcipher_request *req) |
b2174eeb HY |
823 | { |
824 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
825 | } | |
826 | ||
bbdb23b5 | 827 | static struct skcipher_request *req_of_dmreq(struct crypt_config *cc, |
b2174eeb HY |
828 | struct dm_crypt_request *dmreq) |
829 | { | |
bbdb23b5 | 830 | return (struct skcipher_request *)((char *)dmreq - cc->dmreq_start); |
b2174eeb HY |
831 | } |
832 | ||
2dc5327d MB |
833 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
834 | struct dm_crypt_request *dmreq) | |
835 | { | |
836 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
bbdb23b5 | 837 | crypto_skcipher_alignmask(any_tfm(cc)) + 1); |
2dc5327d MB |
838 | } |
839 | ||
01482b76 | 840 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 | 841 | struct convert_context *ctx, |
bbdb23b5 | 842 | struct skcipher_request *req) |
01482b76 | 843 | { |
003b5c57 KO |
844 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
845 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
846 | struct dm_crypt_request *dmreq; |
847 | u8 *iv; | |
40b6229b | 848 | int r; |
3a7f6c99 | 849 | |
b2174eeb | 850 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 851 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 852 | |
c66029f4 | 853 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 854 | dmreq->ctx = ctx; |
3a7f6c99 | 855 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
856 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
857 | bv_in.bv_offset); | |
01482b76 | 858 | |
3a7f6c99 | 859 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
860 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
861 | bv_out.bv_offset); | |
01482b76 | 862 | |
003b5c57 KO |
863 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
864 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 865 | |
3a7f6c99 | 866 | if (cc->iv_gen_ops) { |
2dc5327d | 867 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
868 | if (r < 0) |
869 | return r; | |
870 | } | |
871 | ||
bbdb23b5 HX |
872 | skcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, |
873 | 1 << SECTOR_SHIFT, iv); | |
3a7f6c99 MB |
874 | |
875 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
bbdb23b5 | 876 | r = crypto_skcipher_encrypt(req); |
3a7f6c99 | 877 | else |
bbdb23b5 | 878 | r = crypto_skcipher_decrypt(req); |
3a7f6c99 | 879 | |
2dc5327d MB |
880 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
881 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
882 | ||
3a7f6c99 | 883 | return r; |
01482b76 MB |
884 | } |
885 | ||
95497a96 MB |
886 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
887 | int error); | |
c0297721 | 888 | |
ddd42edf MB |
889 | static void crypt_alloc_req(struct crypt_config *cc, |
890 | struct convert_context *ctx) | |
891 | { | |
c66029f4 | 892 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 893 | |
610f2de3 MP |
894 | if (!ctx->req) |
895 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 896 | |
bbdb23b5 | 897 | skcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
54cea3f6 MB |
898 | |
899 | /* | |
900 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs | |
901 | * requests if driver request queue is full. | |
902 | */ | |
bbdb23b5 | 903 | skcipher_request_set_callback(ctx->req, |
c0297721 | 904 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 905 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
906 | } |
907 | ||
298a9fa0 | 908 | static void crypt_free_req(struct crypt_config *cc, |
bbdb23b5 | 909 | struct skcipher_request *req, struct bio *base_bio) |
298a9fa0 MP |
910 | { |
911 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
912 | ||
bbdb23b5 | 913 | if ((struct skcipher_request *)(io + 1) != req) |
298a9fa0 MP |
914 | mempool_free(req, cc->req_pool); |
915 | } | |
916 | ||
1da177e4 LT |
917 | /* |
918 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
919 | */ | |
920 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 921 | struct convert_context *ctx) |
1da177e4 | 922 | { |
3f1e9070 | 923 | int r; |
1da177e4 | 924 | |
40b6229b | 925 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 926 | |
003b5c57 | 927 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 928 | |
3a7f6c99 MB |
929 | crypt_alloc_req(cc, ctx); |
930 | ||
40b6229b | 931 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 932 | |
610f2de3 | 933 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
934 | |
935 | switch (r) { | |
54cea3f6 MB |
936 | /* |
937 | * The request was queued by a crypto driver | |
938 | * but the driver request queue is full, let's wait. | |
939 | */ | |
3a7f6c99 MB |
940 | case -EBUSY: |
941 | wait_for_completion(&ctx->restart); | |
16735d02 | 942 | reinit_completion(&ctx->restart); |
54cea3f6 MB |
943 | /* fall through */ |
944 | /* | |
945 | * The request is queued and processed asynchronously, | |
946 | * completion function kcryptd_async_done() will be called. | |
947 | */ | |
c0403ec0 | 948 | case -EINPROGRESS: |
610f2de3 | 949 | ctx->req = NULL; |
c66029f4 | 950 | ctx->cc_sector++; |
3f1e9070 | 951 | continue; |
54cea3f6 MB |
952 | /* |
953 | * The request was already processed (synchronously). | |
954 | */ | |
3a7f6c99 | 955 | case 0: |
40b6229b | 956 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 957 | ctx->cc_sector++; |
c7f1b204 | 958 | cond_resched(); |
3a7f6c99 | 959 | continue; |
3a7f6c99 | 960 | |
54cea3f6 | 961 | /* There was an error while processing the request. */ |
3f1e9070 | 962 | default: |
40b6229b | 963 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
964 | return r; |
965 | } | |
1da177e4 LT |
966 | } |
967 | ||
3f1e9070 | 968 | return 0; |
1da177e4 LT |
969 | } |
970 | ||
cf2f1abf MP |
971 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
972 | ||
1da177e4 LT |
973 | /* |
974 | * Generate a new unfragmented bio with the given size | |
586b286b MS |
975 | * This should never violate the device limitations (but only because |
976 | * max_segment_size is being constrained to PAGE_SIZE). | |
7145c241 MP |
977 | * |
978 | * This function may be called concurrently. If we allocate from the mempool | |
979 | * concurrently, there is a possibility of deadlock. For example, if we have | |
980 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from | |
981 | * the mempool concurrently, it may deadlock in a situation where both processes | |
982 | * have allocated 128 pages and the mempool is exhausted. | |
983 | * | |
984 | * In order to avoid this scenario we allocate the pages under a mutex. | |
985 | * | |
986 | * In order to not degrade performance with excessive locking, we try | |
987 | * non-blocking allocations without a mutex first but on failure we fallback | |
988 | * to blocking allocations with a mutex. | |
1da177e4 | 989 | */ |
cf2f1abf | 990 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
1da177e4 | 991 | { |
49a8a920 | 992 | struct crypt_config *cc = io->cc; |
8b004457 | 993 | struct bio *clone; |
1da177e4 | 994 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7145c241 MP |
995 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
996 | unsigned i, len, remaining_size; | |
91e10625 | 997 | struct page *page; |
cf2f1abf | 998 | struct bio_vec *bvec; |
1da177e4 | 999 | |
7145c241 | 1000 | retry: |
d0164adc | 1001 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1002 | mutex_lock(&cc->bio_alloc_lock); |
1003 | ||
2f9941b6 | 1004 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 1005 | if (!clone) |
7145c241 | 1006 | goto return_clone; |
1da177e4 | 1007 | |
027581f3 | 1008 | clone_init(io, clone); |
6a24c718 | 1009 | |
7145c241 MP |
1010 | remaining_size = size; |
1011 | ||
f97380bc | 1012 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 1013 | page = mempool_alloc(cc->page_pool, gfp_mask); |
7145c241 MP |
1014 | if (!page) { |
1015 | crypt_free_buffer_pages(cc, clone); | |
1016 | bio_put(clone); | |
d0164adc | 1017 | gfp_mask |= __GFP_DIRECT_RECLAIM; |
7145c241 MP |
1018 | goto retry; |
1019 | } | |
1da177e4 | 1020 | |
7145c241 | 1021 | len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; |
91e10625 | 1022 | |
cf2f1abf MP |
1023 | bvec = &clone->bi_io_vec[clone->bi_vcnt++]; |
1024 | bvec->bv_page = page; | |
1025 | bvec->bv_len = len; | |
1026 | bvec->bv_offset = 0; | |
1da177e4 | 1027 | |
cf2f1abf | 1028 | clone->bi_iter.bi_size += len; |
1da177e4 | 1029 | |
7145c241 | 1030 | remaining_size -= len; |
1da177e4 LT |
1031 | } |
1032 | ||
7145c241 | 1033 | return_clone: |
d0164adc | 1034 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1035 | mutex_unlock(&cc->bio_alloc_lock); |
1036 | ||
8b004457 | 1037 | return clone; |
1da177e4 LT |
1038 | } |
1039 | ||
644bd2f0 | 1040 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1041 | { |
644bd2f0 | 1042 | unsigned int i; |
1da177e4 LT |
1043 | struct bio_vec *bv; |
1044 | ||
cb34e057 | 1045 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1046 | BUG_ON(!bv->bv_page); |
1047 | mempool_free(bv->bv_page, cc->page_pool); | |
1048 | bv->bv_page = NULL; | |
1049 | } | |
1050 | } | |
1051 | ||
298a9fa0 MP |
1052 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1053 | struct bio *bio, sector_t sector) | |
dc440d1e | 1054 | { |
49a8a920 | 1055 | io->cc = cc; |
dc440d1e MB |
1056 | io->base_bio = bio; |
1057 | io->sector = sector; | |
1058 | io->error = 0; | |
610f2de3 | 1059 | io->ctx.req = NULL; |
40b6229b | 1060 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1061 | } |
1062 | ||
3e1a8bdd MB |
1063 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1064 | { | |
40b6229b | 1065 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1066 | } |
1067 | ||
1da177e4 LT |
1068 | /* |
1069 | * One of the bios was finished. Check for completion of | |
1070 | * the whole request and correctly clean up the buffer. | |
1071 | */ | |
5742fd77 | 1072 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1073 | { |
49a8a920 | 1074 | struct crypt_config *cc = io->cc; |
b35f8caa | 1075 | struct bio *base_bio = io->base_bio; |
b35f8caa | 1076 | int error = io->error; |
1da177e4 | 1077 | |
40b6229b | 1078 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1079 | return; |
1080 | ||
610f2de3 | 1081 | if (io->ctx.req) |
298a9fa0 | 1082 | crypt_free_req(cc, io->ctx.req, base_bio); |
b35f8caa | 1083 | |
4246a0b6 CH |
1084 | base_bio->bi_error = error; |
1085 | bio_endio(base_bio); | |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | /* | |
cabf08e4 | 1089 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1090 | * |
1091 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1092 | * interrupt context. |
cabf08e4 MB |
1093 | * |
1094 | * kcryptd performs the actual encryption or decryption. | |
1095 | * | |
1096 | * kcryptd_io performs the IO submission. | |
1097 | * | |
1098 | * They must be separated as otherwise the final stages could be | |
1099 | * starved by new requests which can block in the first stages due | |
1100 | * to memory allocation. | |
c0297721 AK |
1101 | * |
1102 | * The work is done per CPU global for all dm-crypt instances. | |
1103 | * They should not depend on each other and do not block. | |
1da177e4 | 1104 | */ |
4246a0b6 | 1105 | static void crypt_endio(struct bio *clone) |
8b004457 | 1106 | { |
028867ac | 1107 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1108 | struct crypt_config *cc = io->cc; |
ee7a491e | 1109 | unsigned rw = bio_data_dir(clone); |
9b81c842 | 1110 | int error; |
8b004457 MB |
1111 | |
1112 | /* | |
6712ecf8 | 1113 | * free the processed pages |
8b004457 | 1114 | */ |
ee7a491e | 1115 | if (rw == WRITE) |
644bd2f0 | 1116 | crypt_free_buffer_pages(cc, clone); |
8b004457 | 1117 | |
9b81c842 | 1118 | error = clone->bi_error; |
8b004457 | 1119 | bio_put(clone); |
8b004457 | 1120 | |
9b81c842 | 1121 | if (rw == READ && !error) { |
ee7a491e MB |
1122 | kcryptd_queue_crypt(io); |
1123 | return; | |
1124 | } | |
5742fd77 | 1125 | |
9b81c842 SL |
1126 | if (unlikely(error)) |
1127 | io->error = error; | |
5742fd77 MB |
1128 | |
1129 | crypt_dec_pending(io); | |
8b004457 MB |
1130 | } |
1131 | ||
028867ac | 1132 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1133 | { |
49a8a920 | 1134 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1135 | |
1136 | clone->bi_private = io; | |
1137 | clone->bi_end_io = crypt_endio; | |
1138 | clone->bi_bdev = cc->dev->bdev; | |
e6047149 | 1139 | bio_set_op_attrs(clone, bio_op(io->base_bio), io->base_bio->bi_rw); |
8b004457 MB |
1140 | } |
1141 | ||
20c82538 | 1142 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1143 | { |
49a8a920 | 1144 | struct crypt_config *cc = io->cc; |
8b004457 | 1145 | struct bio *clone; |
93e605c2 | 1146 | |
8b004457 | 1147 | /* |
59779079 MS |
1148 | * We need the original biovec array in order to decrypt |
1149 | * the whole bio data *afterwards* -- thanks to immutable | |
1150 | * biovecs we don't need to worry about the block layer | |
1151 | * modifying the biovec array; so leverage bio_clone_fast(). | |
8b004457 | 1152 | */ |
59779079 | 1153 | clone = bio_clone_fast(io->base_bio, gfp, cc->bs); |
7eaceacc | 1154 | if (!clone) |
20c82538 | 1155 | return 1; |
8b004457 | 1156 | |
20c82538 MB |
1157 | crypt_inc_pending(io); |
1158 | ||
8b004457 | 1159 | clone_init(io, clone); |
4f024f37 | 1160 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1161 | |
93e605c2 | 1162 | generic_make_request(clone); |
20c82538 | 1163 | return 0; |
8b004457 MB |
1164 | } |
1165 | ||
dc267621 MP |
1166 | static void kcryptd_io_read_work(struct work_struct *work) |
1167 | { | |
1168 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1169 | ||
1170 | crypt_inc_pending(io); | |
1171 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1172 | io->error = -ENOMEM; | |
1173 | crypt_dec_pending(io); | |
1174 | } | |
1175 | ||
1176 | static void kcryptd_queue_read(struct dm_crypt_io *io) | |
1177 | { | |
1178 | struct crypt_config *cc = io->cc; | |
1179 | ||
1180 | INIT_WORK(&io->work, kcryptd_io_read_work); | |
1181 | queue_work(cc->io_queue, &io->work); | |
1182 | } | |
1183 | ||
4e4eef64 MB |
1184 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1185 | { | |
95497a96 | 1186 | struct bio *clone = io->ctx.bio_out; |
dc267621 | 1187 | |
95497a96 | 1188 | generic_make_request(clone); |
4e4eef64 MB |
1189 | } |
1190 | ||
b3c5fd30 MP |
1191 | #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) |
1192 | ||
dc267621 | 1193 | static int dmcrypt_write(void *data) |
395b167c | 1194 | { |
dc267621 | 1195 | struct crypt_config *cc = data; |
b3c5fd30 MP |
1196 | struct dm_crypt_io *io; |
1197 | ||
dc267621 | 1198 | while (1) { |
b3c5fd30 | 1199 | struct rb_root write_tree; |
dc267621 | 1200 | struct blk_plug plug; |
395b167c | 1201 | |
dc267621 | 1202 | DECLARE_WAITQUEUE(wait, current); |
395b167c | 1203 | |
dc267621 MP |
1204 | spin_lock_irq(&cc->write_thread_wait.lock); |
1205 | continue_locked: | |
395b167c | 1206 | |
b3c5fd30 | 1207 | if (!RB_EMPTY_ROOT(&cc->write_tree)) |
dc267621 MP |
1208 | goto pop_from_list; |
1209 | ||
bcbd94ff MP |
1210 | if (unlikely(test_bit(DM_CRYPT_EXIT_THREAD, &cc->flags))) { |
1211 | spin_unlock_irq(&cc->write_thread_wait.lock); | |
1212 | break; | |
1213 | } | |
1214 | ||
dc267621 MP |
1215 | __set_current_state(TASK_INTERRUPTIBLE); |
1216 | __add_wait_queue(&cc->write_thread_wait, &wait); | |
1217 | ||
1218 | spin_unlock_irq(&cc->write_thread_wait.lock); | |
1219 | ||
dc267621 MP |
1220 | schedule(); |
1221 | ||
dc267621 MP |
1222 | spin_lock_irq(&cc->write_thread_wait.lock); |
1223 | __remove_wait_queue(&cc->write_thread_wait, &wait); | |
1224 | goto continue_locked; | |
1225 | ||
1226 | pop_from_list: | |
b3c5fd30 MP |
1227 | write_tree = cc->write_tree; |
1228 | cc->write_tree = RB_ROOT; | |
dc267621 MP |
1229 | spin_unlock_irq(&cc->write_thread_wait.lock); |
1230 | ||
b3c5fd30 MP |
1231 | BUG_ON(rb_parent(write_tree.rb_node)); |
1232 | ||
1233 | /* | |
1234 | * Note: we cannot walk the tree here with rb_next because | |
1235 | * the structures may be freed when kcryptd_io_write is called. | |
1236 | */ | |
dc267621 MP |
1237 | blk_start_plug(&plug); |
1238 | do { | |
b3c5fd30 MP |
1239 | io = crypt_io_from_node(rb_first(&write_tree)); |
1240 | rb_erase(&io->rb_node, &write_tree); | |
dc267621 | 1241 | kcryptd_io_write(io); |
b3c5fd30 | 1242 | } while (!RB_EMPTY_ROOT(&write_tree)); |
dc267621 MP |
1243 | blk_finish_plug(&plug); |
1244 | } | |
1245 | return 0; | |
395b167c AK |
1246 | } |
1247 | ||
72c6e7af | 1248 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1249 | { |
dec1cedf | 1250 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1251 | struct crypt_config *cc = io->cc; |
dc267621 | 1252 | unsigned long flags; |
b3c5fd30 MP |
1253 | sector_t sector; |
1254 | struct rb_node **rbp, *parent; | |
dec1cedf | 1255 | |
72c6e7af | 1256 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1257 | crypt_free_buffer_pages(cc, clone); |
1258 | bio_put(clone); | |
6c031f41 | 1259 | crypt_dec_pending(io); |
dec1cedf MB |
1260 | return; |
1261 | } | |
1262 | ||
1263 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1264 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1265 | |
4f024f37 | 1266 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1267 | |
0f5d8e6e MP |
1268 | if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { |
1269 | generic_make_request(clone); | |
1270 | return; | |
1271 | } | |
1272 | ||
dc267621 | 1273 | spin_lock_irqsave(&cc->write_thread_wait.lock, flags); |
b3c5fd30 MP |
1274 | rbp = &cc->write_tree.rb_node; |
1275 | parent = NULL; | |
1276 | sector = io->sector; | |
1277 | while (*rbp) { | |
1278 | parent = *rbp; | |
1279 | if (sector < crypt_io_from_node(parent)->sector) | |
1280 | rbp = &(*rbp)->rb_left; | |
1281 | else | |
1282 | rbp = &(*rbp)->rb_right; | |
1283 | } | |
1284 | rb_link_node(&io->rb_node, parent, rbp); | |
1285 | rb_insert_color(&io->rb_node, &cc->write_tree); | |
1286 | ||
dc267621 MP |
1287 | wake_up_locked(&cc->write_thread_wait); |
1288 | spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); | |
4e4eef64 MB |
1289 | } |
1290 | ||
fc5a5e9a | 1291 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1292 | { |
49a8a920 | 1293 | struct crypt_config *cc = io->cc; |
8b004457 | 1294 | struct bio *clone; |
c8081618 | 1295 | int crypt_finished; |
b635b00e | 1296 | sector_t sector = io->sector; |
dec1cedf | 1297 | int r; |
8b004457 | 1298 | |
fc5a5e9a MB |
1299 | /* |
1300 | * Prevent io from disappearing until this function completes. | |
1301 | */ | |
1302 | crypt_inc_pending(io); | |
b635b00e | 1303 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1304 | |
cf2f1abf MP |
1305 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
1306 | if (unlikely(!clone)) { | |
1307 | io->error = -EIO; | |
1308 | goto dec; | |
1309 | } | |
c8081618 | 1310 | |
cf2f1abf MP |
1311 | io->ctx.bio_out = clone; |
1312 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 1313 | |
cf2f1abf | 1314 | sector += bio_sectors(clone); |
93e605c2 | 1315 | |
cf2f1abf MP |
1316 | crypt_inc_pending(io); |
1317 | r = crypt_convert(cc, &io->ctx); | |
1318 | if (r) | |
1319 | io->error = -EIO; | |
1320 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); | |
933f01d4 | 1321 | |
cf2f1abf MP |
1322 | /* Encryption was already finished, submit io now */ |
1323 | if (crypt_finished) { | |
1324 | kcryptd_crypt_write_io_submit(io, 0); | |
1325 | io->sector = sector; | |
93e605c2 | 1326 | } |
899c95d3 | 1327 | |
cf2f1abf | 1328 | dec: |
899c95d3 | 1329 | crypt_dec_pending(io); |
84131db6 MB |
1330 | } |
1331 | ||
72c6e7af | 1332 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1333 | { |
5742fd77 MB |
1334 | crypt_dec_pending(io); |
1335 | } | |
1336 | ||
4e4eef64 | 1337 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1338 | { |
49a8a920 | 1339 | struct crypt_config *cc = io->cc; |
5742fd77 | 1340 | int r = 0; |
1da177e4 | 1341 | |
3e1a8bdd | 1342 | crypt_inc_pending(io); |
3a7f6c99 | 1343 | |
53017030 | 1344 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1345 | io->sector); |
1da177e4 | 1346 | |
5742fd77 | 1347 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1348 | if (r < 0) |
1349 | io->error = -EIO; | |
5742fd77 | 1350 | |
40b6229b | 1351 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1352 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1353 | |
1354 | crypt_dec_pending(io); | |
1da177e4 LT |
1355 | } |
1356 | ||
95497a96 MB |
1357 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1358 | int error) | |
1359 | { | |
b2174eeb HY |
1360 | struct dm_crypt_request *dmreq = async_req->data; |
1361 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1362 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1363 | struct crypt_config *cc = io->cc; |
95497a96 | 1364 | |
54cea3f6 MB |
1365 | /* |
1366 | * A request from crypto driver backlog is going to be processed now, | |
1367 | * finish the completion and continue in crypt_convert(). | |
1368 | * (Callback will be called for the second time for this request.) | |
1369 | */ | |
c0403ec0 RV |
1370 | if (error == -EINPROGRESS) { |
1371 | complete(&ctx->restart); | |
95497a96 | 1372 | return; |
c0403ec0 | 1373 | } |
95497a96 | 1374 | |
2dc5327d MB |
1375 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1376 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1377 | ||
72c6e7af MP |
1378 | if (error < 0) |
1379 | io->error = -EIO; | |
1380 | ||
298a9fa0 | 1381 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1382 | |
40b6229b | 1383 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
c0403ec0 | 1384 | return; |
95497a96 MB |
1385 | |
1386 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1387 | kcryptd_crypt_read_done(io); |
95497a96 | 1388 | else |
72c6e7af | 1389 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1390 | } |
1391 | ||
395b167c | 1392 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1393 | { |
028867ac | 1394 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1395 | |
cabf08e4 | 1396 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1397 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1398 | else |
395b167c | 1399 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1400 | } |
1401 | ||
395b167c | 1402 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1403 | { |
49a8a920 | 1404 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1405 | |
395b167c AK |
1406 | INIT_WORK(&io->work, kcryptd_crypt); |
1407 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1408 | } |
1409 | ||
1410 | /* | |
1411 | * Decode key from its hex representation | |
1412 | */ | |
1413 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1414 | { | |
1415 | char buffer[3]; | |
1da177e4 LT |
1416 | unsigned int i; |
1417 | ||
1418 | buffer[2] = '\0'; | |
1419 | ||
8b004457 | 1420 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1421 | buffer[0] = *hex++; |
1422 | buffer[1] = *hex++; | |
1423 | ||
1a66a08a | 1424 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1425 | return -EINVAL; |
1426 | } | |
1427 | ||
1428 | if (*hex != '\0') | |
1429 | return -EINVAL; | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
fd2d231f | 1434 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1435 | { |
d1f96423 MB |
1436 | unsigned i; |
1437 | ||
fd2d231f MP |
1438 | if (!cc->tfms) |
1439 | return; | |
1440 | ||
d1f96423 | 1441 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f | 1442 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
bbdb23b5 | 1443 | crypto_free_skcipher(cc->tfms[i]); |
fd2d231f | 1444 | cc->tfms[i] = NULL; |
d1f96423 | 1445 | } |
fd2d231f MP |
1446 | |
1447 | kfree(cc->tfms); | |
1448 | cc->tfms = NULL; | |
d1f96423 MB |
1449 | } |
1450 | ||
fd2d231f | 1451 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1452 | { |
d1f96423 MB |
1453 | unsigned i; |
1454 | int err; | |
1455 | ||
bbdb23b5 | 1456 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_skcipher *), |
fd2d231f MP |
1457 | GFP_KERNEL); |
1458 | if (!cc->tfms) | |
1459 | return -ENOMEM; | |
1460 | ||
d1f96423 | 1461 | for (i = 0; i < cc->tfms_count; i++) { |
bbdb23b5 | 1462 | cc->tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); |
fd2d231f MP |
1463 | if (IS_ERR(cc->tfms[i])) { |
1464 | err = PTR_ERR(cc->tfms[i]); | |
1465 | crypt_free_tfms(cc); | |
d1f96423 MB |
1466 | return err; |
1467 | } | |
1468 | } | |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
c0297721 AK |
1473 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1474 | { | |
da31a078 | 1475 | unsigned subkey_size; |
fd2d231f MP |
1476 | int err = 0, i, r; |
1477 | ||
da31a078 MB |
1478 | /* Ignore extra keys (which are used for IV etc) */ |
1479 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1480 | ||
fd2d231f | 1481 | for (i = 0; i < cc->tfms_count; i++) { |
bbdb23b5 HX |
1482 | r = crypto_skcipher_setkey(cc->tfms[i], |
1483 | cc->key + (i * subkey_size), | |
1484 | subkey_size); | |
fd2d231f MP |
1485 | if (r) |
1486 | err = r; | |
c0297721 AK |
1487 | } |
1488 | ||
1489 | return err; | |
1490 | } | |
1491 | ||
e48d4bbf MB |
1492 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1493 | { | |
de8be5ac MB |
1494 | int r = -EINVAL; |
1495 | int key_string_len = strlen(key); | |
1496 | ||
69a8cfcd | 1497 | /* The key size may not be changed. */ |
de8be5ac MB |
1498 | if (cc->key_size != (key_string_len >> 1)) |
1499 | goto out; | |
e48d4bbf | 1500 | |
69a8cfcd MB |
1501 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1502 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1503 | goto out; |
e48d4bbf | 1504 | |
69a8cfcd | 1505 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1506 | goto out; |
e48d4bbf MB |
1507 | |
1508 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1509 | ||
de8be5ac MB |
1510 | r = crypt_setkey_allcpus(cc); |
1511 | ||
1512 | out: | |
1513 | /* Hex key string not needed after here, so wipe it. */ | |
1514 | memset(key, '0', key_string_len); | |
1515 | ||
1516 | return r; | |
e48d4bbf MB |
1517 | } |
1518 | ||
1519 | static int crypt_wipe_key(struct crypt_config *cc) | |
1520 | { | |
1521 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1522 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1523 | |
1524 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1525 | } |
1526 | ||
28513fcc MB |
1527 | static void crypt_dtr(struct dm_target *ti) |
1528 | { | |
1529 | struct crypt_config *cc = ti->private; | |
1530 | ||
1531 | ti->private = NULL; | |
1532 | ||
1533 | if (!cc) | |
1534 | return; | |
1535 | ||
bcbd94ff MP |
1536 | if (cc->write_thread) { |
1537 | spin_lock_irq(&cc->write_thread_wait.lock); | |
1538 | set_bit(DM_CRYPT_EXIT_THREAD, &cc->flags); | |
1539 | wake_up_locked(&cc->write_thread_wait); | |
1540 | spin_unlock_irq(&cc->write_thread_wait.lock); | |
dc267621 | 1541 | kthread_stop(cc->write_thread); |
bcbd94ff | 1542 | } |
dc267621 | 1543 | |
28513fcc MB |
1544 | if (cc->io_queue) |
1545 | destroy_workqueue(cc->io_queue); | |
1546 | if (cc->crypt_queue) | |
1547 | destroy_workqueue(cc->crypt_queue); | |
1548 | ||
fd2d231f MP |
1549 | crypt_free_tfms(cc); |
1550 | ||
28513fcc MB |
1551 | if (cc->bs) |
1552 | bioset_free(cc->bs); | |
1553 | ||
6f65985e JL |
1554 | mempool_destroy(cc->page_pool); |
1555 | mempool_destroy(cc->req_pool); | |
28513fcc MB |
1556 | |
1557 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1558 | cc->iv_gen_ops->dtr(cc); | |
1559 | ||
28513fcc MB |
1560 | if (cc->dev) |
1561 | dm_put_device(ti, cc->dev); | |
1562 | ||
5ebaee6d | 1563 | kzfree(cc->cipher); |
7dbcd137 | 1564 | kzfree(cc->cipher_string); |
28513fcc MB |
1565 | |
1566 | /* Must zero key material before freeing */ | |
1567 | kzfree(cc); | |
1568 | } | |
1569 | ||
5ebaee6d MB |
1570 | static int crypt_ctr_cipher(struct dm_target *ti, |
1571 | char *cipher_in, char *key) | |
1da177e4 | 1572 | { |
5ebaee6d | 1573 | struct crypt_config *cc = ti->private; |
d1f96423 | 1574 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1575 | char *cipher_api = NULL; |
fd2d231f | 1576 | int ret = -EINVAL; |
31998ef1 | 1577 | char dummy; |
1da177e4 | 1578 | |
5ebaee6d MB |
1579 | /* Convert to crypto api definition? */ |
1580 | if (strchr(cipher_in, '(')) { | |
1581 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1582 | return -EINVAL; |
1583 | } | |
1584 | ||
7dbcd137 MB |
1585 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1586 | if (!cc->cipher_string) | |
1587 | goto bad_mem; | |
1588 | ||
5ebaee6d MB |
1589 | /* |
1590 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1591 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1592 | */ |
1593 | tmp = cipher_in; | |
d1f96423 MB |
1594 | keycount = strsep(&tmp, "-"); |
1595 | cipher = strsep(&keycount, ":"); | |
1596 | ||
1597 | if (!keycount) | |
1598 | cc->tfms_count = 1; | |
31998ef1 | 1599 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1600 | !is_power_of_2(cc->tfms_count)) { |
1601 | ti->error = "Bad cipher key count specification"; | |
1602 | return -EINVAL; | |
1603 | } | |
1604 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1605 | cc->key_extra_size = 0; |
5ebaee6d MB |
1606 | |
1607 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1608 | if (!cc->cipher) | |
1609 | goto bad_mem; | |
1610 | ||
1da177e4 LT |
1611 | chainmode = strsep(&tmp, "-"); |
1612 | ivopts = strsep(&tmp, "-"); | |
1613 | ivmode = strsep(&ivopts, ":"); | |
1614 | ||
1615 | if (tmp) | |
5ebaee6d | 1616 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1617 | |
7dbcd137 MB |
1618 | /* |
1619 | * For compatibility with the original dm-crypt mapping format, if | |
1620 | * only the cipher name is supplied, use cbc-plain. | |
1621 | */ | |
5ebaee6d | 1622 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1623 | chainmode = "cbc"; |
1624 | ivmode = "plain"; | |
1625 | } | |
1626 | ||
d1806f6a | 1627 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1628 | ti->error = "IV mechanism required"; |
1629 | return -EINVAL; | |
1da177e4 LT |
1630 | } |
1631 | ||
5ebaee6d MB |
1632 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1633 | if (!cipher_api) | |
1634 | goto bad_mem; | |
1635 | ||
1636 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1637 | "%s(%s)", chainmode, cipher); | |
1638 | if (ret < 0) { | |
1639 | kfree(cipher_api); | |
1640 | goto bad_mem; | |
1da177e4 LT |
1641 | } |
1642 | ||
5ebaee6d | 1643 | /* Allocate cipher */ |
fd2d231f MP |
1644 | ret = crypt_alloc_tfms(cc, cipher_api); |
1645 | if (ret < 0) { | |
1646 | ti->error = "Error allocating crypto tfm"; | |
1647 | goto bad; | |
1da177e4 | 1648 | } |
1da177e4 | 1649 | |
5ebaee6d | 1650 | /* Initialize IV */ |
bbdb23b5 | 1651 | cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1652 | if (cc->iv_size) |
1653 | /* at least a 64 bit sector number should fit in our buffer */ | |
1654 | cc->iv_size = max(cc->iv_size, | |
1655 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1656 | else if (ivmode) { | |
1657 | DMWARN("Selected cipher does not support IVs"); | |
1658 | ivmode = NULL; | |
1659 | } | |
1660 | ||
1661 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1662 | if (ivmode == NULL) |
1663 | cc->iv_gen_ops = NULL; | |
1664 | else if (strcmp(ivmode, "plain") == 0) | |
1665 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1666 | else if (strcmp(ivmode, "plain64") == 0) |
1667 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1668 | else if (strcmp(ivmode, "essiv") == 0) |
1669 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1670 | else if (strcmp(ivmode, "benbi") == 0) |
1671 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1672 | else if (strcmp(ivmode, "null") == 0) |
1673 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1674 | else if (strcmp(ivmode, "lmk") == 0) { |
1675 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1676 | /* |
1677 | * Version 2 and 3 is recognised according | |
34745785 MB |
1678 | * to length of provided multi-key string. |
1679 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1680 | * All keys (including IV seed) are always the same size. |
34745785 | 1681 | */ |
da31a078 | 1682 | if (cc->key_size % cc->key_parts) { |
34745785 | 1683 | cc->key_parts++; |
da31a078 MB |
1684 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1685 | } | |
ed04d981 MB |
1686 | } else if (strcmp(ivmode, "tcw") == 0) { |
1687 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1688 | cc->key_parts += 2; /* IV + whitening */ | |
1689 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1690 | } else { |
5ebaee6d | 1691 | ret = -EINVAL; |
72d94861 | 1692 | ti->error = "Invalid IV mode"; |
28513fcc | 1693 | goto bad; |
1da177e4 LT |
1694 | } |
1695 | ||
da31a078 MB |
1696 | /* Initialize and set key */ |
1697 | ret = crypt_set_key(cc, key); | |
1698 | if (ret < 0) { | |
1699 | ti->error = "Error decoding and setting key"; | |
1700 | goto bad; | |
1701 | } | |
1702 | ||
28513fcc MB |
1703 | /* Allocate IV */ |
1704 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1705 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1706 | if (ret < 0) { | |
1707 | ti->error = "Error creating IV"; | |
1708 | goto bad; | |
1709 | } | |
1710 | } | |
1da177e4 | 1711 | |
28513fcc MB |
1712 | /* Initialize IV (set keys for ESSIV etc) */ |
1713 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1714 | ret = cc->iv_gen_ops->init(cc); | |
1715 | if (ret < 0) { | |
1716 | ti->error = "Error initialising IV"; | |
1717 | goto bad; | |
1718 | } | |
b95bf2d3 MB |
1719 | } |
1720 | ||
5ebaee6d MB |
1721 | ret = 0; |
1722 | bad: | |
1723 | kfree(cipher_api); | |
1724 | return ret; | |
1725 | ||
1726 | bad_mem: | |
1727 | ti->error = "Cannot allocate cipher strings"; | |
1728 | return -ENOMEM; | |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * Construct an encryption mapping: | |
1733 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1734 | */ | |
1735 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1736 | { | |
1737 | struct crypt_config *cc; | |
772ae5f5 | 1738 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1739 | unsigned long long tmpll; |
1740 | int ret; | |
d49ec52f | 1741 | size_t iv_size_padding; |
772ae5f5 MB |
1742 | struct dm_arg_set as; |
1743 | const char *opt_string; | |
31998ef1 | 1744 | char dummy; |
772ae5f5 MB |
1745 | |
1746 | static struct dm_arg _args[] = { | |
0f5d8e6e | 1747 | {0, 3, "Invalid number of feature args"}, |
772ae5f5 | 1748 | }; |
5ebaee6d | 1749 | |
772ae5f5 | 1750 | if (argc < 5) { |
5ebaee6d MB |
1751 | ti->error = "Not enough arguments"; |
1752 | return -EINVAL; | |
1da177e4 LT |
1753 | } |
1754 | ||
5ebaee6d MB |
1755 | key_size = strlen(argv[1]) >> 1; |
1756 | ||
1757 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1758 | if (!cc) { | |
1759 | ti->error = "Cannot allocate encryption context"; | |
1760 | return -ENOMEM; | |
1761 | } | |
69a8cfcd | 1762 | cc->key_size = key_size; |
5ebaee6d MB |
1763 | |
1764 | ti->private = cc; | |
1765 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1766 | if (ret < 0) | |
1767 | goto bad; | |
1768 | ||
bbdb23b5 HX |
1769 | cc->dmreq_start = sizeof(struct skcipher_request); |
1770 | cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); | |
d49ec52f MP |
1771 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1772 | ||
bbdb23b5 | 1773 | if (crypto_skcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { |
d49ec52f MP |
1774 | /* Allocate the padding exactly */ |
1775 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
bbdb23b5 | 1776 | & crypto_skcipher_alignmask(any_tfm(cc)); |
d49ec52f MP |
1777 | } else { |
1778 | /* | |
1779 | * If the cipher requires greater alignment than kmalloc | |
1780 | * alignment, we don't know the exact position of the | |
1781 | * initialization vector. We must assume worst case. | |
1782 | */ | |
bbdb23b5 | 1783 | iv_size_padding = crypto_skcipher_alignmask(any_tfm(cc)); |
d49ec52f | 1784 | } |
ddd42edf | 1785 | |
94f5e024 | 1786 | ret = -ENOMEM; |
ddd42edf | 1787 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
d49ec52f | 1788 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1789 | if (!cc->req_pool) { |
1790 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1791 | goto bad; |
ddd42edf | 1792 | } |
ddd42edf | 1793 | |
30187e1d | 1794 | cc->per_bio_data_size = ti->per_io_data_size = |
d49ec52f MP |
1795 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1796 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1797 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1798 | |
cf2f1abf | 1799 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
1da177e4 | 1800 | if (!cc->page_pool) { |
72d94861 | 1801 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1802 | goto bad; |
1da177e4 LT |
1803 | } |
1804 | ||
bb799ca0 | 1805 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1806 | if (!cc->bs) { |
1807 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1808 | goto bad; |
6a24c718 MB |
1809 | } |
1810 | ||
7145c241 MP |
1811 | mutex_init(&cc->bio_alloc_lock); |
1812 | ||
28513fcc | 1813 | ret = -EINVAL; |
31998ef1 | 1814 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1815 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1816 | goto bad; |
1da177e4 | 1817 | } |
4ee218cd | 1818 | cc->iv_offset = tmpll; |
1da177e4 | 1819 | |
e80d1c80 VG |
1820 | ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); |
1821 | if (ret) { | |
28513fcc MB |
1822 | ti->error = "Device lookup failed"; |
1823 | goto bad; | |
1824 | } | |
1825 | ||
e80d1c80 | 1826 | ret = -EINVAL; |
31998ef1 | 1827 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1828 | ti->error = "Invalid device sector"; |
28513fcc | 1829 | goto bad; |
1da177e4 | 1830 | } |
4ee218cd | 1831 | cc->start = tmpll; |
1da177e4 | 1832 | |
772ae5f5 MB |
1833 | argv += 5; |
1834 | argc -= 5; | |
1835 | ||
1836 | /* Optional parameters */ | |
1837 | if (argc) { | |
1838 | as.argc = argc; | |
1839 | as.argv = argv; | |
1840 | ||
1841 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1842 | if (ret) | |
1843 | goto bad; | |
1844 | ||
44c144f9 | 1845 | ret = -EINVAL; |
f3396c58 MP |
1846 | while (opt_params--) { |
1847 | opt_string = dm_shift_arg(&as); | |
1848 | if (!opt_string) { | |
1849 | ti->error = "Not enough feature arguments"; | |
1850 | goto bad; | |
1851 | } | |
772ae5f5 | 1852 | |
f3396c58 MP |
1853 | if (!strcasecmp(opt_string, "allow_discards")) |
1854 | ti->num_discard_bios = 1; | |
1855 | ||
1856 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
1857 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1858 | ||
0f5d8e6e MP |
1859 | else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) |
1860 | set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); | |
1861 | ||
f3396c58 MP |
1862 | else { |
1863 | ti->error = "Invalid feature arguments"; | |
1864 | goto bad; | |
1865 | } | |
772ae5f5 MB |
1866 | } |
1867 | } | |
1868 | ||
28513fcc | 1869 | ret = -ENOMEM; |
670368a8 | 1870 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1871 | if (!cc->io_queue) { |
1872 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1873 | goto bad; |
cabf08e4 MB |
1874 | } |
1875 | ||
f3396c58 MP |
1876 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
1877 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); | |
1878 | else | |
1879 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1880 | num_online_cpus()); | |
cabf08e4 | 1881 | if (!cc->crypt_queue) { |
9934a8be | 1882 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1883 | goto bad; |
9934a8be MB |
1884 | } |
1885 | ||
dc267621 | 1886 | init_waitqueue_head(&cc->write_thread_wait); |
b3c5fd30 | 1887 | cc->write_tree = RB_ROOT; |
dc267621 MP |
1888 | |
1889 | cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); | |
1890 | if (IS_ERR(cc->write_thread)) { | |
1891 | ret = PTR_ERR(cc->write_thread); | |
1892 | cc->write_thread = NULL; | |
1893 | ti->error = "Couldn't spawn write thread"; | |
1894 | goto bad; | |
1895 | } | |
1896 | wake_up_process(cc->write_thread); | |
1897 | ||
55a62eef | 1898 | ti->num_flush_bios = 1; |
0ac55489 | 1899 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1900 | |
1da177e4 LT |
1901 | return 0; |
1902 | ||
28513fcc MB |
1903 | bad: |
1904 | crypt_dtr(ti); | |
1905 | return ret; | |
1da177e4 LT |
1906 | } |
1907 | ||
7de3ee57 | 1908 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1909 | { |
028867ac | 1910 | struct dm_crypt_io *io; |
49a8a920 | 1911 | struct crypt_config *cc = ti->private; |
647c7db1 | 1912 | |
772ae5f5 | 1913 | /* |
28a8f0d3 MC |
1914 | * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. |
1915 | * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight | |
e6047149 | 1916 | * - for REQ_OP_DISCARD caller must use flush if IO ordering matters |
772ae5f5 | 1917 | */ |
28a8f0d3 MC |
1918 | if (unlikely(bio->bi_rw & REQ_PREFLUSH || |
1919 | bio_op(bio) == REQ_OP_DISCARD)) { | |
647c7db1 | 1920 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1921 | if (bio_sectors(bio)) |
4f024f37 KO |
1922 | bio->bi_iter.bi_sector = cc->start + |
1923 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1924 | return DM_MAPIO_REMAPPED; |
1925 | } | |
1da177e4 | 1926 | |
298a9fa0 MP |
1927 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
1928 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
bbdb23b5 | 1929 | io->ctx.req = (struct skcipher_request *)(io + 1); |
cabf08e4 | 1930 | |
20c82538 MB |
1931 | if (bio_data_dir(io->base_bio) == READ) { |
1932 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
dc267621 | 1933 | kcryptd_queue_read(io); |
20c82538 | 1934 | } else |
cabf08e4 | 1935 | kcryptd_queue_crypt(io); |
1da177e4 | 1936 | |
d2a7ad29 | 1937 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1938 | } |
1939 | ||
fd7c092e MP |
1940 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1941 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1942 | { |
5ebaee6d | 1943 | struct crypt_config *cc = ti->private; |
fd7c092e | 1944 | unsigned i, sz = 0; |
f3396c58 | 1945 | int num_feature_args = 0; |
1da177e4 LT |
1946 | |
1947 | switch (type) { | |
1948 | case STATUSTYPE_INFO: | |
1949 | result[0] = '\0'; | |
1950 | break; | |
1951 | ||
1952 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1953 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1954 | |
fd7c092e MP |
1955 | if (cc->key_size > 0) |
1956 | for (i = 0; i < cc->key_size; i++) | |
1957 | DMEMIT("%02x", cc->key[i]); | |
1958 | else | |
1959 | DMEMIT("-"); | |
1da177e4 | 1960 | |
4ee218cd AM |
1961 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1962 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1963 | |
f3396c58 MP |
1964 | num_feature_args += !!ti->num_discard_bios; |
1965 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
0f5d8e6e | 1966 | num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); |
f3396c58 MP |
1967 | if (num_feature_args) { |
1968 | DMEMIT(" %d", num_feature_args); | |
1969 | if (ti->num_discard_bios) | |
1970 | DMEMIT(" allow_discards"); | |
1971 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) | |
1972 | DMEMIT(" same_cpu_crypt"); | |
0f5d8e6e MP |
1973 | if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) |
1974 | DMEMIT(" submit_from_crypt_cpus"); | |
f3396c58 | 1975 | } |
772ae5f5 | 1976 | |
1da177e4 LT |
1977 | break; |
1978 | } | |
1da177e4 LT |
1979 | } |
1980 | ||
e48d4bbf MB |
1981 | static void crypt_postsuspend(struct dm_target *ti) |
1982 | { | |
1983 | struct crypt_config *cc = ti->private; | |
1984 | ||
1985 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1986 | } | |
1987 | ||
1988 | static int crypt_preresume(struct dm_target *ti) | |
1989 | { | |
1990 | struct crypt_config *cc = ti->private; | |
1991 | ||
1992 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1993 | DMERR("aborting resume - crypt key is not set."); | |
1994 | return -EAGAIN; | |
1995 | } | |
1996 | ||
1997 | return 0; | |
1998 | } | |
1999 | ||
2000 | static void crypt_resume(struct dm_target *ti) | |
2001 | { | |
2002 | struct crypt_config *cc = ti->private; | |
2003 | ||
2004 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
2005 | } | |
2006 | ||
2007 | /* Message interface | |
2008 | * key set <key> | |
2009 | * key wipe | |
2010 | */ | |
2011 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
2012 | { | |
2013 | struct crypt_config *cc = ti->private; | |
542da317 | 2014 | int ret = -EINVAL; |
e48d4bbf MB |
2015 | |
2016 | if (argc < 2) | |
2017 | goto error; | |
2018 | ||
498f0103 | 2019 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
2020 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
2021 | DMWARN("not suspended during key manipulation."); | |
2022 | return -EINVAL; | |
2023 | } | |
498f0103 | 2024 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
2025 | ret = crypt_set_key(cc, argv[2]); |
2026 | if (ret) | |
2027 | return ret; | |
2028 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
2029 | ret = cc->iv_gen_ops->init(cc); | |
2030 | return ret; | |
2031 | } | |
498f0103 | 2032 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
2033 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
2034 | ret = cc->iv_gen_ops->wipe(cc); | |
2035 | if (ret) | |
2036 | return ret; | |
2037 | } | |
e48d4bbf | 2038 | return crypt_wipe_key(cc); |
542da317 | 2039 | } |
e48d4bbf MB |
2040 | } |
2041 | ||
2042 | error: | |
2043 | DMWARN("unrecognised message received."); | |
2044 | return -EINVAL; | |
2045 | } | |
2046 | ||
af4874e0 MS |
2047 | static int crypt_iterate_devices(struct dm_target *ti, |
2048 | iterate_devices_callout_fn fn, void *data) | |
2049 | { | |
2050 | struct crypt_config *cc = ti->private; | |
2051 | ||
5dea271b | 2052 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
2053 | } |
2054 | ||
586b286b MS |
2055 | static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) |
2056 | { | |
2057 | /* | |
2058 | * Unfortunate constraint that is required to avoid the potential | |
2059 | * for exceeding underlying device's max_segments limits -- due to | |
2060 | * crypt_alloc_buffer() possibly allocating pages for the encryption | |
2061 | * bio that are not as physically contiguous as the original bio. | |
2062 | */ | |
2063 | limits->max_segment_size = PAGE_SIZE; | |
2064 | } | |
2065 | ||
1da177e4 LT |
2066 | static struct target_type crypt_target = { |
2067 | .name = "crypt", | |
586b286b | 2068 | .version = {1, 14, 1}, |
1da177e4 LT |
2069 | .module = THIS_MODULE, |
2070 | .ctr = crypt_ctr, | |
2071 | .dtr = crypt_dtr, | |
2072 | .map = crypt_map, | |
2073 | .status = crypt_status, | |
e48d4bbf MB |
2074 | .postsuspend = crypt_postsuspend, |
2075 | .preresume = crypt_preresume, | |
2076 | .resume = crypt_resume, | |
2077 | .message = crypt_message, | |
af4874e0 | 2078 | .iterate_devices = crypt_iterate_devices, |
586b286b | 2079 | .io_hints = crypt_io_hints, |
1da177e4 LT |
2080 | }; |
2081 | ||
2082 | static int __init dm_crypt_init(void) | |
2083 | { | |
2084 | int r; | |
2085 | ||
1da177e4 | 2086 | r = dm_register_target(&crypt_target); |
94f5e024 | 2087 | if (r < 0) |
72d94861 | 2088 | DMERR("register failed %d", r); |
1da177e4 | 2089 | |
1da177e4 LT |
2090 | return r; |
2091 | } | |
2092 | ||
2093 | static void __exit dm_crypt_exit(void) | |
2094 | { | |
10d3bd09 | 2095 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
2096 | } |
2097 | ||
2098 | module_init(dm_crypt_init); | |
2099 | module_exit(dm_crypt_exit); | |
2100 | ||
bf14299f | 2101 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
2102 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
2103 | MODULE_LICENSE("GPL"); |