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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, |
f659b100 | 116 | DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; |
c0297721 AK |
117 | |
118 | /* | |
610f2de3 | 119 | * The fields in here must be read only after initialization. |
c0297721 | 120 | */ |
1da177e4 LT |
121 | struct crypt_config { |
122 | struct dm_dev *dev; | |
123 | sector_t start; | |
124 | ||
125 | /* | |
ddd42edf MB |
126 | * pool for per bio private data, crypto requests and |
127 | * encryption requeusts/buffer pages | |
1da177e4 | 128 | */ |
ddd42edf | 129 | mempool_t *req_pool; |
1da177e4 | 130 | mempool_t *page_pool; |
6a24c718 | 131 | struct bio_set *bs; |
7145c241 | 132 | struct mutex bio_alloc_lock; |
1da177e4 | 133 | |
cabf08e4 MB |
134 | struct workqueue_struct *io_queue; |
135 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 136 | |
dc267621 MP |
137 | struct task_struct *write_thread; |
138 | wait_queue_head_t write_thread_wait; | |
b3c5fd30 | 139 | struct rb_root write_tree; |
dc267621 | 140 | |
5ebaee6d | 141 | char *cipher; |
7dbcd137 | 142 | char *cipher_string; |
5ebaee6d | 143 | |
1da177e4 | 144 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 145 | union { |
60473592 MB |
146 | struct iv_essiv_private essiv; |
147 | struct iv_benbi_private benbi; | |
34745785 | 148 | struct iv_lmk_private lmk; |
ed04d981 | 149 | struct iv_tcw_private tcw; |
79066ad3 | 150 | } iv_gen_private; |
1da177e4 LT |
151 | sector_t iv_offset; |
152 | unsigned int iv_size; | |
153 | ||
fd2d231f MP |
154 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
155 | void *iv_private; | |
bbdb23b5 | 156 | struct crypto_skcipher **tfms; |
d1f96423 | 157 | unsigned tfms_count; |
c0297721 | 158 | |
ddd42edf MB |
159 | /* |
160 | * Layout of each crypto request: | |
161 | * | |
bbdb23b5 | 162 | * struct skcipher_request |
ddd42edf MB |
163 | * context |
164 | * padding | |
165 | * struct dm_crypt_request | |
166 | * padding | |
167 | * IV | |
168 | * | |
169 | * The padding is added so that dm_crypt_request and the IV are | |
170 | * correctly aligned. | |
171 | */ | |
172 | unsigned int dmreq_start; | |
ddd42edf | 173 | |
298a9fa0 MP |
174 | unsigned int per_bio_data_size; |
175 | ||
e48d4bbf | 176 | unsigned long flags; |
1da177e4 | 177 | unsigned int key_size; |
da31a078 MB |
178 | unsigned int key_parts; /* independent parts in key buffer */ |
179 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
180 | u8 key[0]; |
181 | }; | |
182 | ||
0a83df6c | 183 | #define MIN_IOS 64 |
1da177e4 | 184 | |
028867ac | 185 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 186 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 187 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 188 | |
c0297721 AK |
189 | /* |
190 | * Use this to access cipher attributes that are the same for each CPU. | |
191 | */ | |
bbdb23b5 | 192 | static struct crypto_skcipher *any_tfm(struct crypt_config *cc) |
c0297721 | 193 | { |
fd2d231f | 194 | return cc->tfms[0]; |
c0297721 AK |
195 | } |
196 | ||
1da177e4 LT |
197 | /* |
198 | * Different IV generation algorithms: | |
199 | * | |
3c164bd8 | 200 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 201 | * number, padded with zeros if necessary. |
1da177e4 | 202 | * |
61afef61 MB |
203 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
204 | * number, padded with zeros if necessary. | |
205 | * | |
3c164bd8 RS |
206 | * essiv: "encrypted sector|salt initial vector", the sector number is |
207 | * encrypted with the bulk cipher using a salt as key. The salt | |
208 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 209 | * |
48527fa7 RS |
210 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
211 | * (needed for LRW-32-AES and possible other narrow block modes) | |
212 | * | |
46b47730 LN |
213 | * null: the initial vector is always zero. Provides compatibility with |
214 | * obsolete loop_fish2 devices. Do not use for new devices. | |
215 | * | |
34745785 MB |
216 | * lmk: Compatible implementation of the block chaining mode used |
217 | * by the Loop-AES block device encryption system | |
218 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
219 | * It operates on full 512 byte sectors and uses CBC | |
220 | * with an IV derived from the sector number, the data and | |
221 | * optionally extra IV seed. | |
222 | * This means that after decryption the first block | |
223 | * of sector must be tweaked according to decrypted data. | |
224 | * Loop-AES can use three encryption schemes: | |
225 | * version 1: is plain aes-cbc mode | |
226 | * version 2: uses 64 multikey scheme with lmk IV generator | |
227 | * version 3: the same as version 2 with additional IV seed | |
228 | * (it uses 65 keys, last key is used as IV seed) | |
229 | * | |
ed04d981 MB |
230 | * tcw: Compatible implementation of the block chaining mode used |
231 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
e44f23b3 | 232 | * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat |
ed04d981 MB |
233 | * It operates on full 512 byte sectors and uses CBC |
234 | * with an IV derived from initial key and the sector number. | |
235 | * In addition, whitening value is applied on every sector, whitening | |
236 | * is calculated from initial key, sector number and mixed using CRC32. | |
237 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
238 | * and should be used for old compatible containers access only. | |
239 | * | |
1da177e4 LT |
240 | * plumb: unimplemented, see: |
241 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
242 | */ | |
243 | ||
2dc5327d MB |
244 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
245 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
246 | { |
247 | memset(iv, 0, cc->iv_size); | |
283a8328 | 248 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
249 | |
250 | return 0; | |
251 | } | |
252 | ||
61afef61 | 253 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 254 | struct dm_crypt_request *dmreq) |
61afef61 MB |
255 | { |
256 | memset(iv, 0, cc->iv_size); | |
283a8328 | 257 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
258 | |
259 | return 0; | |
260 | } | |
261 | ||
b95bf2d3 MB |
262 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
263 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
264 | { | |
265 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
bbdb23b5 | 266 | AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); |
b95bf2d3 | 267 | struct scatterlist sg; |
c0297721 | 268 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 269 | int err; |
b95bf2d3 MB |
270 | |
271 | sg_init_one(&sg, cc->key, cc->key_size); | |
bbdb23b5 HX |
272 | ahash_request_set_tfm(req, essiv->hash_tfm); |
273 | ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); | |
274 | ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); | |
b95bf2d3 | 275 | |
bbdb23b5 HX |
276 | err = crypto_ahash_digest(req); |
277 | ahash_request_zero(req); | |
b95bf2d3 MB |
278 | if (err) |
279 | return err; | |
280 | ||
fd2d231f | 281 | essiv_tfm = cc->iv_private; |
c0297721 | 282 | |
fd2d231f | 283 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
bbdb23b5 | 284 | crypto_ahash_digestsize(essiv->hash_tfm)); |
fd2d231f MP |
285 | if (err) |
286 | return err; | |
c0297721 AK |
287 | |
288 | return 0; | |
b95bf2d3 MB |
289 | } |
290 | ||
542da317 MB |
291 | /* Wipe salt and reset key derived from volume key */ |
292 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
293 | { | |
294 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
bbdb23b5 | 295 | unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); |
c0297721 | 296 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 297 | int r, err = 0; |
542da317 MB |
298 | |
299 | memset(essiv->salt, 0, salt_size); | |
300 | ||
fd2d231f MP |
301 | essiv_tfm = cc->iv_private; |
302 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
303 | if (r) | |
304 | err = r; | |
c0297721 AK |
305 | |
306 | return err; | |
307 | } | |
308 | ||
309 | /* Set up per cpu cipher state */ | |
310 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
311 | struct dm_target *ti, | |
312 | u8 *salt, unsigned saltsize) | |
313 | { | |
314 | struct crypto_cipher *essiv_tfm; | |
315 | int err; | |
316 | ||
317 | /* Setup the essiv_tfm with the given salt */ | |
318 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
319 | if (IS_ERR(essiv_tfm)) { | |
320 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
321 | return essiv_tfm; | |
322 | } | |
323 | ||
324 | if (crypto_cipher_blocksize(essiv_tfm) != | |
bbdb23b5 | 325 | crypto_skcipher_ivsize(any_tfm(cc))) { |
c0297721 AK |
326 | ti->error = "Block size of ESSIV cipher does " |
327 | "not match IV size of block cipher"; | |
328 | crypto_free_cipher(essiv_tfm); | |
329 | return ERR_PTR(-EINVAL); | |
330 | } | |
331 | ||
332 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
333 | if (err) { | |
334 | ti->error = "Failed to set key for ESSIV cipher"; | |
335 | crypto_free_cipher(essiv_tfm); | |
336 | return ERR_PTR(err); | |
337 | } | |
338 | ||
339 | return essiv_tfm; | |
542da317 MB |
340 | } |
341 | ||
60473592 MB |
342 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
343 | { | |
c0297721 | 344 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
345 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
346 | ||
bbdb23b5 | 347 | crypto_free_ahash(essiv->hash_tfm); |
b95bf2d3 MB |
348 | essiv->hash_tfm = NULL; |
349 | ||
350 | kzfree(essiv->salt); | |
351 | essiv->salt = NULL; | |
c0297721 | 352 | |
fd2d231f | 353 | essiv_tfm = cc->iv_private; |
c0297721 | 354 | |
fd2d231f MP |
355 | if (essiv_tfm) |
356 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 357 | |
fd2d231f | 358 | cc->iv_private = NULL; |
60473592 MB |
359 | } |
360 | ||
1da177e4 | 361 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 362 | const char *opts) |
1da177e4 | 363 | { |
5861f1be | 364 | struct crypto_cipher *essiv_tfm = NULL; |
bbdb23b5 | 365 | struct crypto_ahash *hash_tfm = NULL; |
5861f1be | 366 | u8 *salt = NULL; |
fd2d231f | 367 | int err; |
1da177e4 | 368 | |
5861f1be | 369 | if (!opts) { |
72d94861 | 370 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
371 | return -EINVAL; |
372 | } | |
373 | ||
b95bf2d3 | 374 | /* Allocate hash algorithm */ |
bbdb23b5 | 375 | hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); |
35058687 | 376 | if (IS_ERR(hash_tfm)) { |
72d94861 | 377 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
378 | err = PTR_ERR(hash_tfm); |
379 | goto bad; | |
1da177e4 LT |
380 | } |
381 | ||
bbdb23b5 | 382 | salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 383 | if (!salt) { |
72d94861 | 384 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
385 | err = -ENOMEM; |
386 | goto bad; | |
1da177e4 LT |
387 | } |
388 | ||
b95bf2d3 | 389 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
390 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
391 | ||
fd2d231f | 392 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
bbdb23b5 | 393 | crypto_ahash_digestsize(hash_tfm)); |
fd2d231f MP |
394 | if (IS_ERR(essiv_tfm)) { |
395 | crypt_iv_essiv_dtr(cc); | |
396 | return PTR_ERR(essiv_tfm); | |
c0297721 | 397 | } |
fd2d231f | 398 | cc->iv_private = essiv_tfm; |
c0297721 | 399 | |
1da177e4 | 400 | return 0; |
5861f1be MB |
401 | |
402 | bad: | |
5861f1be | 403 | if (hash_tfm && !IS_ERR(hash_tfm)) |
bbdb23b5 | 404 | crypto_free_ahash(hash_tfm); |
b95bf2d3 | 405 | kfree(salt); |
5861f1be | 406 | return err; |
1da177e4 LT |
407 | } |
408 | ||
2dc5327d MB |
409 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
410 | struct dm_crypt_request *dmreq) | |
1da177e4 | 411 | { |
fd2d231f | 412 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 413 | |
1da177e4 | 414 | memset(iv, 0, cc->iv_size); |
283a8328 | 415 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
416 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
417 | ||
1da177e4 LT |
418 | return 0; |
419 | } | |
420 | ||
48527fa7 RS |
421 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
422 | const char *opts) | |
423 | { | |
bbdb23b5 | 424 | unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 425 | int log = ilog2(bs); |
48527fa7 RS |
426 | |
427 | /* we need to calculate how far we must shift the sector count | |
428 | * to get the cipher block count, we use this shift in _gen */ | |
429 | ||
430 | if (1 << log != bs) { | |
431 | ti->error = "cypher blocksize is not a power of 2"; | |
432 | return -EINVAL; | |
433 | } | |
434 | ||
435 | if (log > 9) { | |
436 | ti->error = "cypher blocksize is > 512"; | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
60473592 | 440 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
441 | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
446 | { | |
48527fa7 RS |
447 | } |
448 | ||
2dc5327d MB |
449 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
450 | struct dm_crypt_request *dmreq) | |
48527fa7 | 451 | { |
79066ad3 HX |
452 | __be64 val; |
453 | ||
48527fa7 | 454 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 455 | |
2dc5327d | 456 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 457 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 458 | |
1da177e4 LT |
459 | return 0; |
460 | } | |
461 | ||
2dc5327d MB |
462 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
463 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
464 | { |
465 | memset(iv, 0, cc->iv_size); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
34745785 MB |
470 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
471 | { | |
472 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
473 | ||
474 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
475 | crypto_free_shash(lmk->hash_tfm); | |
476 | lmk->hash_tfm = NULL; | |
477 | ||
478 | kzfree(lmk->seed); | |
479 | lmk->seed = NULL; | |
480 | } | |
481 | ||
482 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
483 | const char *opts) | |
484 | { | |
485 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
486 | ||
487 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
488 | if (IS_ERR(lmk->hash_tfm)) { | |
489 | ti->error = "Error initializing LMK hash"; | |
490 | return PTR_ERR(lmk->hash_tfm); | |
491 | } | |
492 | ||
493 | /* No seed in LMK version 2 */ | |
494 | if (cc->key_parts == cc->tfms_count) { | |
495 | lmk->seed = NULL; | |
496 | return 0; | |
497 | } | |
498 | ||
499 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
500 | if (!lmk->seed) { | |
501 | crypt_iv_lmk_dtr(cc); | |
502 | ti->error = "Error kmallocing seed storage in LMK"; | |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
510 | { | |
511 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
512 | int subkey_size = cc->key_size / cc->key_parts; | |
513 | ||
514 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
515 | if (lmk->seed) | |
516 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
517 | crypto_shash_digestsize(lmk->hash_tfm)); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
523 | { | |
524 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
525 | ||
526 | if (lmk->seed) | |
527 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
533 | struct dm_crypt_request *dmreq, | |
534 | u8 *data) | |
535 | { | |
536 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 537 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 538 | struct md5_state md5state; |
da31a078 | 539 | __le32 buf[4]; |
34745785 MB |
540 | int i, r; |
541 | ||
b6106265 JSM |
542 | desc->tfm = lmk->hash_tfm; |
543 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
34745785 | 544 | |
b6106265 | 545 | r = crypto_shash_init(desc); |
34745785 MB |
546 | if (r) |
547 | return r; | |
548 | ||
549 | if (lmk->seed) { | |
b6106265 | 550 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
551 | if (r) |
552 | return r; | |
553 | } | |
554 | ||
555 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 556 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
557 | if (r) |
558 | return r; | |
559 | ||
560 | /* Sector is cropped to 56 bits here */ | |
561 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
562 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
563 | buf[2] = cpu_to_le32(4024); | |
564 | buf[3] = 0; | |
b6106265 | 565 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
566 | if (r) |
567 | return r; | |
568 | ||
569 | /* No MD5 padding here */ | |
b6106265 | 570 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
571 | if (r) |
572 | return r; | |
573 | ||
574 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
575 | __cpu_to_le32s(&md5state.hash[i]); | |
576 | memcpy(iv, &md5state.hash, cc->iv_size); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
582 | struct dm_crypt_request *dmreq) | |
583 | { | |
584 | u8 *src; | |
585 | int r = 0; | |
586 | ||
587 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 588 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 589 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 590 | kunmap_atomic(src); |
34745785 MB |
591 | } else |
592 | memset(iv, 0, cc->iv_size); | |
593 | ||
594 | return r; | |
595 | } | |
596 | ||
597 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
598 | struct dm_crypt_request *dmreq) | |
599 | { | |
600 | u8 *dst; | |
601 | int r; | |
602 | ||
603 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
604 | return 0; | |
605 | ||
c2e022cb | 606 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
607 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
608 | ||
609 | /* Tweak the first block of plaintext sector */ | |
610 | if (!r) | |
611 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
612 | ||
c2e022cb | 613 | kunmap_atomic(dst); |
34745785 MB |
614 | return r; |
615 | } | |
616 | ||
ed04d981 MB |
617 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
618 | { | |
619 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
620 | ||
621 | kzfree(tcw->iv_seed); | |
622 | tcw->iv_seed = NULL; | |
623 | kzfree(tcw->whitening); | |
624 | tcw->whitening = NULL; | |
625 | ||
626 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
627 | crypto_free_shash(tcw->crc32_tfm); | |
628 | tcw->crc32_tfm = NULL; | |
629 | } | |
630 | ||
631 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
632 | const char *opts) | |
633 | { | |
634 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
635 | ||
636 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
637 | ti->error = "Wrong key size for TCW"; | |
638 | return -EINVAL; | |
639 | } | |
640 | ||
641 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
642 | if (IS_ERR(tcw->crc32_tfm)) { | |
643 | ti->error = "Error initializing CRC32 in TCW"; | |
644 | return PTR_ERR(tcw->crc32_tfm); | |
645 | } | |
646 | ||
647 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
648 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
649 | if (!tcw->iv_seed || !tcw->whitening) { | |
650 | crypt_iv_tcw_dtr(cc); | |
651 | ti->error = "Error allocating seed storage in TCW"; | |
652 | return -ENOMEM; | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
659 | { | |
660 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
661 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
662 | ||
663 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
664 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
665 | TCW_WHITENING_SIZE); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
671 | { | |
672 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
673 | ||
674 | memset(tcw->iv_seed, 0, cc->iv_size); | |
675 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
681 | struct dm_crypt_request *dmreq, | |
682 | u8 *data) | |
683 | { | |
684 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
350b5393 | 685 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 | 686 | u8 buf[TCW_WHITENING_SIZE]; |
b6106265 | 687 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
688 | int i, r; |
689 | ||
690 | /* xor whitening with sector number */ | |
691 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
692 | crypto_xor(buf, (u8 *)§or, 8); | |
693 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
694 | ||
695 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 JSM |
696 | desc->tfm = tcw->crc32_tfm; |
697 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
ed04d981 | 698 | for (i = 0; i < 4; i++) { |
b6106265 | 699 | r = crypto_shash_init(desc); |
ed04d981 MB |
700 | if (r) |
701 | goto out; | |
b6106265 | 702 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
ed04d981 MB |
703 | if (r) |
704 | goto out; | |
b6106265 | 705 | r = crypto_shash_final(desc, &buf[i * 4]); |
ed04d981 MB |
706 | if (r) |
707 | goto out; | |
708 | } | |
709 | crypto_xor(&buf[0], &buf[12], 4); | |
710 | crypto_xor(&buf[4], &buf[8], 4); | |
711 | ||
712 | /* apply whitening (8 bytes) to whole sector */ | |
713 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
714 | crypto_xor(data + i * 8, buf, 8); | |
715 | out: | |
1a71d6ff | 716 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
717 | return r; |
718 | } | |
719 | ||
720 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
721 | struct dm_crypt_request *dmreq) | |
722 | { | |
723 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
350b5393 | 724 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 MB |
725 | u8 *src; |
726 | int r = 0; | |
727 | ||
728 | /* Remove whitening from ciphertext */ | |
729 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
730 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
731 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
732 | kunmap_atomic(src); | |
733 | } | |
734 | ||
735 | /* Calculate IV */ | |
736 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
737 | crypto_xor(iv, (u8 *)§or, 8); | |
738 | if (cc->iv_size > 8) | |
739 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
740 | ||
741 | return r; | |
742 | } | |
743 | ||
744 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
745 | struct dm_crypt_request *dmreq) | |
746 | { | |
747 | u8 *dst; | |
748 | int r; | |
749 | ||
750 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
751 | return 0; | |
752 | ||
753 | /* Apply whitening on ciphertext */ | |
754 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
755 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
756 | kunmap_atomic(dst); | |
757 | ||
758 | return r; | |
759 | } | |
760 | ||
1da177e4 LT |
761 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
762 | .generator = crypt_iv_plain_gen | |
763 | }; | |
764 | ||
61afef61 MB |
765 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
766 | .generator = crypt_iv_plain64_gen | |
767 | }; | |
768 | ||
1da177e4 LT |
769 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
770 | .ctr = crypt_iv_essiv_ctr, | |
771 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 772 | .init = crypt_iv_essiv_init, |
542da317 | 773 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
774 | .generator = crypt_iv_essiv_gen |
775 | }; | |
776 | ||
48527fa7 RS |
777 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
778 | .ctr = crypt_iv_benbi_ctr, | |
779 | .dtr = crypt_iv_benbi_dtr, | |
780 | .generator = crypt_iv_benbi_gen | |
781 | }; | |
1da177e4 | 782 | |
46b47730 LN |
783 | static struct crypt_iv_operations crypt_iv_null_ops = { |
784 | .generator = crypt_iv_null_gen | |
785 | }; | |
786 | ||
34745785 MB |
787 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
788 | .ctr = crypt_iv_lmk_ctr, | |
789 | .dtr = crypt_iv_lmk_dtr, | |
790 | .init = crypt_iv_lmk_init, | |
791 | .wipe = crypt_iv_lmk_wipe, | |
792 | .generator = crypt_iv_lmk_gen, | |
793 | .post = crypt_iv_lmk_post | |
794 | }; | |
795 | ||
ed04d981 MB |
796 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
797 | .ctr = crypt_iv_tcw_ctr, | |
798 | .dtr = crypt_iv_tcw_dtr, | |
799 | .init = crypt_iv_tcw_init, | |
800 | .wipe = crypt_iv_tcw_wipe, | |
801 | .generator = crypt_iv_tcw_gen, | |
802 | .post = crypt_iv_tcw_post | |
803 | }; | |
804 | ||
d469f841 MB |
805 | static void crypt_convert_init(struct crypt_config *cc, |
806 | struct convert_context *ctx, | |
807 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 808 | sector_t sector) |
1da177e4 LT |
809 | { |
810 | ctx->bio_in = bio_in; | |
811 | ctx->bio_out = bio_out; | |
003b5c57 KO |
812 | if (bio_in) |
813 | ctx->iter_in = bio_in->bi_iter; | |
814 | if (bio_out) | |
815 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 816 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 817 | init_completion(&ctx->restart); |
1da177e4 LT |
818 | } |
819 | ||
b2174eeb | 820 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
bbdb23b5 | 821 | struct skcipher_request *req) |
b2174eeb HY |
822 | { |
823 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
824 | } | |
825 | ||
bbdb23b5 | 826 | static struct skcipher_request *req_of_dmreq(struct crypt_config *cc, |
b2174eeb HY |
827 | struct dm_crypt_request *dmreq) |
828 | { | |
bbdb23b5 | 829 | return (struct skcipher_request *)((char *)dmreq - cc->dmreq_start); |
b2174eeb HY |
830 | } |
831 | ||
2dc5327d MB |
832 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
833 | struct dm_crypt_request *dmreq) | |
834 | { | |
835 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
bbdb23b5 | 836 | crypto_skcipher_alignmask(any_tfm(cc)) + 1); |
2dc5327d MB |
837 | } |
838 | ||
01482b76 | 839 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 | 840 | struct convert_context *ctx, |
bbdb23b5 | 841 | struct skcipher_request *req) |
01482b76 | 842 | { |
003b5c57 KO |
843 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
844 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
845 | struct dm_crypt_request *dmreq; |
846 | u8 *iv; | |
40b6229b | 847 | int r; |
3a7f6c99 | 848 | |
b2174eeb | 849 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 850 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 851 | |
c66029f4 | 852 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 853 | dmreq->ctx = ctx; |
3a7f6c99 | 854 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
855 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
856 | bv_in.bv_offset); | |
01482b76 | 857 | |
3a7f6c99 | 858 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
859 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
860 | bv_out.bv_offset); | |
01482b76 | 861 | |
003b5c57 KO |
862 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
863 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 864 | |
3a7f6c99 | 865 | if (cc->iv_gen_ops) { |
2dc5327d | 866 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
867 | if (r < 0) |
868 | return r; | |
869 | } | |
870 | ||
bbdb23b5 HX |
871 | skcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, |
872 | 1 << SECTOR_SHIFT, iv); | |
3a7f6c99 MB |
873 | |
874 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
bbdb23b5 | 875 | r = crypto_skcipher_encrypt(req); |
3a7f6c99 | 876 | else |
bbdb23b5 | 877 | r = crypto_skcipher_decrypt(req); |
3a7f6c99 | 878 | |
2dc5327d MB |
879 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
880 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
881 | ||
3a7f6c99 | 882 | return r; |
01482b76 MB |
883 | } |
884 | ||
95497a96 MB |
885 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
886 | int error); | |
c0297721 | 887 | |
ddd42edf MB |
888 | static void crypt_alloc_req(struct crypt_config *cc, |
889 | struct convert_context *ctx) | |
890 | { | |
c66029f4 | 891 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 892 | |
610f2de3 MP |
893 | if (!ctx->req) |
894 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 895 | |
bbdb23b5 | 896 | skcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
54cea3f6 MB |
897 | |
898 | /* | |
899 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs | |
900 | * requests if driver request queue is full. | |
901 | */ | |
bbdb23b5 | 902 | skcipher_request_set_callback(ctx->req, |
c0297721 | 903 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 904 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
905 | } |
906 | ||
298a9fa0 | 907 | static void crypt_free_req(struct crypt_config *cc, |
bbdb23b5 | 908 | struct skcipher_request *req, struct bio *base_bio) |
298a9fa0 MP |
909 | { |
910 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
911 | ||
bbdb23b5 | 912 | if ((struct skcipher_request *)(io + 1) != req) |
298a9fa0 MP |
913 | mempool_free(req, cc->req_pool); |
914 | } | |
915 | ||
1da177e4 LT |
916 | /* |
917 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
918 | */ | |
919 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 920 | struct convert_context *ctx) |
1da177e4 | 921 | { |
3f1e9070 | 922 | int r; |
1da177e4 | 923 | |
40b6229b | 924 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 925 | |
003b5c57 | 926 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 927 | |
3a7f6c99 MB |
928 | crypt_alloc_req(cc, ctx); |
929 | ||
40b6229b | 930 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 931 | |
610f2de3 | 932 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
933 | |
934 | switch (r) { | |
54cea3f6 MB |
935 | /* |
936 | * The request was queued by a crypto driver | |
937 | * but the driver request queue is full, let's wait. | |
938 | */ | |
3a7f6c99 MB |
939 | case -EBUSY: |
940 | wait_for_completion(&ctx->restart); | |
16735d02 | 941 | reinit_completion(&ctx->restart); |
54cea3f6 MB |
942 | /* fall through */ |
943 | /* | |
944 | * The request is queued and processed asynchronously, | |
945 | * completion function kcryptd_async_done() will be called. | |
946 | */ | |
c0403ec0 | 947 | case -EINPROGRESS: |
610f2de3 | 948 | ctx->req = NULL; |
c66029f4 | 949 | ctx->cc_sector++; |
3f1e9070 | 950 | continue; |
54cea3f6 MB |
951 | /* |
952 | * The request was already processed (synchronously). | |
953 | */ | |
3a7f6c99 | 954 | case 0: |
40b6229b | 955 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 956 | ctx->cc_sector++; |
c7f1b204 | 957 | cond_resched(); |
3a7f6c99 | 958 | continue; |
3a7f6c99 | 959 | |
54cea3f6 | 960 | /* There was an error while processing the request. */ |
3f1e9070 | 961 | default: |
40b6229b | 962 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
963 | return r; |
964 | } | |
1da177e4 LT |
965 | } |
966 | ||
3f1e9070 | 967 | return 0; |
1da177e4 LT |
968 | } |
969 | ||
cf2f1abf MP |
970 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
971 | ||
1da177e4 LT |
972 | /* |
973 | * Generate a new unfragmented bio with the given size | |
586b286b MS |
974 | * This should never violate the device limitations (but only because |
975 | * max_segment_size is being constrained to PAGE_SIZE). | |
7145c241 MP |
976 | * |
977 | * This function may be called concurrently. If we allocate from the mempool | |
978 | * concurrently, there is a possibility of deadlock. For example, if we have | |
979 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from | |
980 | * the mempool concurrently, it may deadlock in a situation where both processes | |
981 | * have allocated 128 pages and the mempool is exhausted. | |
982 | * | |
983 | * In order to avoid this scenario we allocate the pages under a mutex. | |
984 | * | |
985 | * In order to not degrade performance with excessive locking, we try | |
986 | * non-blocking allocations without a mutex first but on failure we fallback | |
987 | * to blocking allocations with a mutex. | |
1da177e4 | 988 | */ |
cf2f1abf | 989 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
1da177e4 | 990 | { |
49a8a920 | 991 | struct crypt_config *cc = io->cc; |
8b004457 | 992 | struct bio *clone; |
1da177e4 | 993 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7145c241 MP |
994 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
995 | unsigned i, len, remaining_size; | |
91e10625 | 996 | struct page *page; |
1da177e4 | 997 | |
7145c241 | 998 | retry: |
d0164adc | 999 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1000 | mutex_lock(&cc->bio_alloc_lock); |
1001 | ||
2f9941b6 | 1002 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 1003 | if (!clone) |
7145c241 | 1004 | goto return_clone; |
1da177e4 | 1005 | |
027581f3 | 1006 | clone_init(io, clone); |
6a24c718 | 1007 | |
7145c241 MP |
1008 | remaining_size = size; |
1009 | ||
f97380bc | 1010 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 1011 | page = mempool_alloc(cc->page_pool, gfp_mask); |
7145c241 MP |
1012 | if (!page) { |
1013 | crypt_free_buffer_pages(cc, clone); | |
1014 | bio_put(clone); | |
d0164adc | 1015 | gfp_mask |= __GFP_DIRECT_RECLAIM; |
7145c241 MP |
1016 | goto retry; |
1017 | } | |
1da177e4 | 1018 | |
7145c241 | 1019 | len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; |
91e10625 | 1020 | |
0dae7fe5 | 1021 | bio_add_page(clone, page, len, 0); |
1da177e4 | 1022 | |
7145c241 | 1023 | remaining_size -= len; |
1da177e4 LT |
1024 | } |
1025 | ||
7145c241 | 1026 | return_clone: |
d0164adc | 1027 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1028 | mutex_unlock(&cc->bio_alloc_lock); |
1029 | ||
8b004457 | 1030 | return clone; |
1da177e4 LT |
1031 | } |
1032 | ||
644bd2f0 | 1033 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1034 | { |
644bd2f0 | 1035 | unsigned int i; |
1da177e4 LT |
1036 | struct bio_vec *bv; |
1037 | ||
cb34e057 | 1038 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1039 | BUG_ON(!bv->bv_page); |
1040 | mempool_free(bv->bv_page, cc->page_pool); | |
1041 | bv->bv_page = NULL; | |
1042 | } | |
1043 | } | |
1044 | ||
298a9fa0 MP |
1045 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1046 | struct bio *bio, sector_t sector) | |
dc440d1e | 1047 | { |
49a8a920 | 1048 | io->cc = cc; |
dc440d1e MB |
1049 | io->base_bio = bio; |
1050 | io->sector = sector; | |
1051 | io->error = 0; | |
610f2de3 | 1052 | io->ctx.req = NULL; |
40b6229b | 1053 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1054 | } |
1055 | ||
3e1a8bdd MB |
1056 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1057 | { | |
40b6229b | 1058 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1059 | } |
1060 | ||
1da177e4 LT |
1061 | /* |
1062 | * One of the bios was finished. Check for completion of | |
1063 | * the whole request and correctly clean up the buffer. | |
1064 | */ | |
5742fd77 | 1065 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1066 | { |
49a8a920 | 1067 | struct crypt_config *cc = io->cc; |
b35f8caa | 1068 | struct bio *base_bio = io->base_bio; |
b35f8caa | 1069 | int error = io->error; |
1da177e4 | 1070 | |
40b6229b | 1071 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1072 | return; |
1073 | ||
610f2de3 | 1074 | if (io->ctx.req) |
298a9fa0 | 1075 | crypt_free_req(cc, io->ctx.req, base_bio); |
b35f8caa | 1076 | |
4246a0b6 CH |
1077 | base_bio->bi_error = error; |
1078 | bio_endio(base_bio); | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | /* | |
cabf08e4 | 1082 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1083 | * |
1084 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1085 | * interrupt context. |
cabf08e4 MB |
1086 | * |
1087 | * kcryptd performs the actual encryption or decryption. | |
1088 | * | |
1089 | * kcryptd_io performs the IO submission. | |
1090 | * | |
1091 | * They must be separated as otherwise the final stages could be | |
1092 | * starved by new requests which can block in the first stages due | |
1093 | * to memory allocation. | |
c0297721 AK |
1094 | * |
1095 | * The work is done per CPU global for all dm-crypt instances. | |
1096 | * They should not depend on each other and do not block. | |
1da177e4 | 1097 | */ |
4246a0b6 | 1098 | static void crypt_endio(struct bio *clone) |
8b004457 | 1099 | { |
028867ac | 1100 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1101 | struct crypt_config *cc = io->cc; |
ee7a491e | 1102 | unsigned rw = bio_data_dir(clone); |
9b81c842 | 1103 | int error; |
8b004457 MB |
1104 | |
1105 | /* | |
6712ecf8 | 1106 | * free the processed pages |
8b004457 | 1107 | */ |
ee7a491e | 1108 | if (rw == WRITE) |
644bd2f0 | 1109 | crypt_free_buffer_pages(cc, clone); |
8b004457 | 1110 | |
9b81c842 | 1111 | error = clone->bi_error; |
8b004457 | 1112 | bio_put(clone); |
8b004457 | 1113 | |
9b81c842 | 1114 | if (rw == READ && !error) { |
ee7a491e MB |
1115 | kcryptd_queue_crypt(io); |
1116 | return; | |
1117 | } | |
5742fd77 | 1118 | |
9b81c842 SL |
1119 | if (unlikely(error)) |
1120 | io->error = error; | |
5742fd77 MB |
1121 | |
1122 | crypt_dec_pending(io); | |
8b004457 MB |
1123 | } |
1124 | ||
028867ac | 1125 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1126 | { |
49a8a920 | 1127 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1128 | |
1129 | clone->bi_private = io; | |
1130 | clone->bi_end_io = crypt_endio; | |
1131 | clone->bi_bdev = cc->dev->bdev; | |
4382e33a | 1132 | bio_set_op_attrs(clone, bio_op(io->base_bio), bio_flags(io->base_bio)); |
8b004457 MB |
1133 | } |
1134 | ||
20c82538 | 1135 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1136 | { |
49a8a920 | 1137 | struct crypt_config *cc = io->cc; |
8b004457 | 1138 | struct bio *clone; |
93e605c2 | 1139 | |
8b004457 | 1140 | /* |
59779079 MS |
1141 | * We need the original biovec array in order to decrypt |
1142 | * the whole bio data *afterwards* -- thanks to immutable | |
1143 | * biovecs we don't need to worry about the block layer | |
1144 | * modifying the biovec array; so leverage bio_clone_fast(). | |
8b004457 | 1145 | */ |
59779079 | 1146 | clone = bio_clone_fast(io->base_bio, gfp, cc->bs); |
7eaceacc | 1147 | if (!clone) |
20c82538 | 1148 | return 1; |
8b004457 | 1149 | |
20c82538 MB |
1150 | crypt_inc_pending(io); |
1151 | ||
8b004457 | 1152 | clone_init(io, clone); |
4f024f37 | 1153 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1154 | |
93e605c2 | 1155 | generic_make_request(clone); |
20c82538 | 1156 | return 0; |
8b004457 MB |
1157 | } |
1158 | ||
dc267621 MP |
1159 | static void kcryptd_io_read_work(struct work_struct *work) |
1160 | { | |
1161 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1162 | ||
1163 | crypt_inc_pending(io); | |
1164 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1165 | io->error = -ENOMEM; | |
1166 | crypt_dec_pending(io); | |
1167 | } | |
1168 | ||
1169 | static void kcryptd_queue_read(struct dm_crypt_io *io) | |
1170 | { | |
1171 | struct crypt_config *cc = io->cc; | |
1172 | ||
1173 | INIT_WORK(&io->work, kcryptd_io_read_work); | |
1174 | queue_work(cc->io_queue, &io->work); | |
1175 | } | |
1176 | ||
4e4eef64 MB |
1177 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1178 | { | |
95497a96 | 1179 | struct bio *clone = io->ctx.bio_out; |
dc267621 | 1180 | |
95497a96 | 1181 | generic_make_request(clone); |
4e4eef64 MB |
1182 | } |
1183 | ||
b3c5fd30 MP |
1184 | #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) |
1185 | ||
dc267621 | 1186 | static int dmcrypt_write(void *data) |
395b167c | 1187 | { |
dc267621 | 1188 | struct crypt_config *cc = data; |
b3c5fd30 MP |
1189 | struct dm_crypt_io *io; |
1190 | ||
dc267621 | 1191 | while (1) { |
b3c5fd30 | 1192 | struct rb_root write_tree; |
dc267621 | 1193 | struct blk_plug plug; |
395b167c | 1194 | |
dc267621 | 1195 | DECLARE_WAITQUEUE(wait, current); |
395b167c | 1196 | |
dc267621 MP |
1197 | spin_lock_irq(&cc->write_thread_wait.lock); |
1198 | continue_locked: | |
395b167c | 1199 | |
b3c5fd30 | 1200 | if (!RB_EMPTY_ROOT(&cc->write_tree)) |
dc267621 MP |
1201 | goto pop_from_list; |
1202 | ||
f659b100 | 1203 | set_current_state(TASK_INTERRUPTIBLE); |
dc267621 MP |
1204 | __add_wait_queue(&cc->write_thread_wait, &wait); |
1205 | ||
1206 | spin_unlock_irq(&cc->write_thread_wait.lock); | |
1207 | ||
f659b100 RV |
1208 | if (unlikely(kthread_should_stop())) { |
1209 | set_task_state(current, TASK_RUNNING); | |
1210 | remove_wait_queue(&cc->write_thread_wait, &wait); | |
1211 | break; | |
1212 | } | |
1213 | ||
dc267621 MP |
1214 | schedule(); |
1215 | ||
f659b100 | 1216 | set_task_state(current, TASK_RUNNING); |
dc267621 MP |
1217 | spin_lock_irq(&cc->write_thread_wait.lock); |
1218 | __remove_wait_queue(&cc->write_thread_wait, &wait); | |
1219 | goto continue_locked; | |
1220 | ||
1221 | pop_from_list: | |
b3c5fd30 MP |
1222 | write_tree = cc->write_tree; |
1223 | cc->write_tree = RB_ROOT; | |
dc267621 MP |
1224 | spin_unlock_irq(&cc->write_thread_wait.lock); |
1225 | ||
b3c5fd30 MP |
1226 | BUG_ON(rb_parent(write_tree.rb_node)); |
1227 | ||
1228 | /* | |
1229 | * Note: we cannot walk the tree here with rb_next because | |
1230 | * the structures may be freed when kcryptd_io_write is called. | |
1231 | */ | |
dc267621 MP |
1232 | blk_start_plug(&plug); |
1233 | do { | |
b3c5fd30 MP |
1234 | io = crypt_io_from_node(rb_first(&write_tree)); |
1235 | rb_erase(&io->rb_node, &write_tree); | |
dc267621 | 1236 | kcryptd_io_write(io); |
b3c5fd30 | 1237 | } while (!RB_EMPTY_ROOT(&write_tree)); |
dc267621 MP |
1238 | blk_finish_plug(&plug); |
1239 | } | |
1240 | return 0; | |
395b167c AK |
1241 | } |
1242 | ||
72c6e7af | 1243 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1244 | { |
dec1cedf | 1245 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1246 | struct crypt_config *cc = io->cc; |
dc267621 | 1247 | unsigned long flags; |
b3c5fd30 MP |
1248 | sector_t sector; |
1249 | struct rb_node **rbp, *parent; | |
dec1cedf | 1250 | |
72c6e7af | 1251 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1252 | crypt_free_buffer_pages(cc, clone); |
1253 | bio_put(clone); | |
6c031f41 | 1254 | crypt_dec_pending(io); |
dec1cedf MB |
1255 | return; |
1256 | } | |
1257 | ||
1258 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1259 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1260 | |
4f024f37 | 1261 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1262 | |
0f5d8e6e MP |
1263 | if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { |
1264 | generic_make_request(clone); | |
1265 | return; | |
1266 | } | |
1267 | ||
dc267621 | 1268 | spin_lock_irqsave(&cc->write_thread_wait.lock, flags); |
b3c5fd30 MP |
1269 | rbp = &cc->write_tree.rb_node; |
1270 | parent = NULL; | |
1271 | sector = io->sector; | |
1272 | while (*rbp) { | |
1273 | parent = *rbp; | |
1274 | if (sector < crypt_io_from_node(parent)->sector) | |
1275 | rbp = &(*rbp)->rb_left; | |
1276 | else | |
1277 | rbp = &(*rbp)->rb_right; | |
1278 | } | |
1279 | rb_link_node(&io->rb_node, parent, rbp); | |
1280 | rb_insert_color(&io->rb_node, &cc->write_tree); | |
1281 | ||
dc267621 MP |
1282 | wake_up_locked(&cc->write_thread_wait); |
1283 | spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); | |
4e4eef64 MB |
1284 | } |
1285 | ||
fc5a5e9a | 1286 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1287 | { |
49a8a920 | 1288 | struct crypt_config *cc = io->cc; |
8b004457 | 1289 | struct bio *clone; |
c8081618 | 1290 | int crypt_finished; |
b635b00e | 1291 | sector_t sector = io->sector; |
dec1cedf | 1292 | int r; |
8b004457 | 1293 | |
fc5a5e9a MB |
1294 | /* |
1295 | * Prevent io from disappearing until this function completes. | |
1296 | */ | |
1297 | crypt_inc_pending(io); | |
b635b00e | 1298 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1299 | |
cf2f1abf MP |
1300 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
1301 | if (unlikely(!clone)) { | |
1302 | io->error = -EIO; | |
1303 | goto dec; | |
1304 | } | |
c8081618 | 1305 | |
cf2f1abf MP |
1306 | io->ctx.bio_out = clone; |
1307 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 1308 | |
cf2f1abf | 1309 | sector += bio_sectors(clone); |
93e605c2 | 1310 | |
cf2f1abf MP |
1311 | crypt_inc_pending(io); |
1312 | r = crypt_convert(cc, &io->ctx); | |
1313 | if (r) | |
1314 | io->error = -EIO; | |
1315 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); | |
933f01d4 | 1316 | |
cf2f1abf MP |
1317 | /* Encryption was already finished, submit io now */ |
1318 | if (crypt_finished) { | |
1319 | kcryptd_crypt_write_io_submit(io, 0); | |
1320 | io->sector = sector; | |
93e605c2 | 1321 | } |
899c95d3 | 1322 | |
cf2f1abf | 1323 | dec: |
899c95d3 | 1324 | crypt_dec_pending(io); |
84131db6 MB |
1325 | } |
1326 | ||
72c6e7af | 1327 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1328 | { |
5742fd77 MB |
1329 | crypt_dec_pending(io); |
1330 | } | |
1331 | ||
4e4eef64 | 1332 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1333 | { |
49a8a920 | 1334 | struct crypt_config *cc = io->cc; |
5742fd77 | 1335 | int r = 0; |
1da177e4 | 1336 | |
3e1a8bdd | 1337 | crypt_inc_pending(io); |
3a7f6c99 | 1338 | |
53017030 | 1339 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1340 | io->sector); |
1da177e4 | 1341 | |
5742fd77 | 1342 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1343 | if (r < 0) |
1344 | io->error = -EIO; | |
5742fd77 | 1345 | |
40b6229b | 1346 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1347 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1348 | |
1349 | crypt_dec_pending(io); | |
1da177e4 LT |
1350 | } |
1351 | ||
95497a96 MB |
1352 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1353 | int error) | |
1354 | { | |
b2174eeb HY |
1355 | struct dm_crypt_request *dmreq = async_req->data; |
1356 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1357 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1358 | struct crypt_config *cc = io->cc; |
95497a96 | 1359 | |
54cea3f6 MB |
1360 | /* |
1361 | * A request from crypto driver backlog is going to be processed now, | |
1362 | * finish the completion and continue in crypt_convert(). | |
1363 | * (Callback will be called for the second time for this request.) | |
1364 | */ | |
c0403ec0 RV |
1365 | if (error == -EINPROGRESS) { |
1366 | complete(&ctx->restart); | |
95497a96 | 1367 | return; |
c0403ec0 | 1368 | } |
95497a96 | 1369 | |
2dc5327d MB |
1370 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1371 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1372 | ||
72c6e7af MP |
1373 | if (error < 0) |
1374 | io->error = -EIO; | |
1375 | ||
298a9fa0 | 1376 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1377 | |
40b6229b | 1378 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
c0403ec0 | 1379 | return; |
95497a96 MB |
1380 | |
1381 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1382 | kcryptd_crypt_read_done(io); |
95497a96 | 1383 | else |
72c6e7af | 1384 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1385 | } |
1386 | ||
395b167c | 1387 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1388 | { |
028867ac | 1389 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1390 | |
cabf08e4 | 1391 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1392 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1393 | else |
395b167c | 1394 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1395 | } |
1396 | ||
395b167c | 1397 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1398 | { |
49a8a920 | 1399 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1400 | |
395b167c AK |
1401 | INIT_WORK(&io->work, kcryptd_crypt); |
1402 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1403 | } |
1404 | ||
1405 | /* | |
1406 | * Decode key from its hex representation | |
1407 | */ | |
1408 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1409 | { | |
1410 | char buffer[3]; | |
1da177e4 LT |
1411 | unsigned int i; |
1412 | ||
1413 | buffer[2] = '\0'; | |
1414 | ||
8b004457 | 1415 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1416 | buffer[0] = *hex++; |
1417 | buffer[1] = *hex++; | |
1418 | ||
1a66a08a | 1419 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1420 | return -EINVAL; |
1421 | } | |
1422 | ||
1423 | if (*hex != '\0') | |
1424 | return -EINVAL; | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
fd2d231f | 1429 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1430 | { |
d1f96423 MB |
1431 | unsigned i; |
1432 | ||
fd2d231f MP |
1433 | if (!cc->tfms) |
1434 | return; | |
1435 | ||
d1f96423 | 1436 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f | 1437 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
bbdb23b5 | 1438 | crypto_free_skcipher(cc->tfms[i]); |
fd2d231f | 1439 | cc->tfms[i] = NULL; |
d1f96423 | 1440 | } |
fd2d231f MP |
1441 | |
1442 | kfree(cc->tfms); | |
1443 | cc->tfms = NULL; | |
d1f96423 MB |
1444 | } |
1445 | ||
fd2d231f | 1446 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1447 | { |
d1f96423 MB |
1448 | unsigned i; |
1449 | int err; | |
1450 | ||
5d0be84e | 1451 | cc->tfms = kzalloc(cc->tfms_count * sizeof(struct crypto_skcipher *), |
fd2d231f MP |
1452 | GFP_KERNEL); |
1453 | if (!cc->tfms) | |
1454 | return -ENOMEM; | |
1455 | ||
d1f96423 | 1456 | for (i = 0; i < cc->tfms_count; i++) { |
bbdb23b5 | 1457 | cc->tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); |
fd2d231f MP |
1458 | if (IS_ERR(cc->tfms[i])) { |
1459 | err = PTR_ERR(cc->tfms[i]); | |
1460 | crypt_free_tfms(cc); | |
d1f96423 MB |
1461 | return err; |
1462 | } | |
1463 | } | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
671ea6b4 | 1468 | static int crypt_setkey(struct crypt_config *cc) |
c0297721 | 1469 | { |
da31a078 | 1470 | unsigned subkey_size; |
fd2d231f MP |
1471 | int err = 0, i, r; |
1472 | ||
da31a078 MB |
1473 | /* Ignore extra keys (which are used for IV etc) */ |
1474 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1475 | ||
fd2d231f | 1476 | for (i = 0; i < cc->tfms_count; i++) { |
bbdb23b5 HX |
1477 | r = crypto_skcipher_setkey(cc->tfms[i], |
1478 | cc->key + (i * subkey_size), | |
1479 | subkey_size); | |
fd2d231f MP |
1480 | if (r) |
1481 | err = r; | |
c0297721 AK |
1482 | } |
1483 | ||
1484 | return err; | |
1485 | } | |
1486 | ||
e48d4bbf MB |
1487 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1488 | { | |
de8be5ac MB |
1489 | int r = -EINVAL; |
1490 | int key_string_len = strlen(key); | |
1491 | ||
69a8cfcd | 1492 | /* The key size may not be changed. */ |
de8be5ac MB |
1493 | if (cc->key_size != (key_string_len >> 1)) |
1494 | goto out; | |
e48d4bbf | 1495 | |
69a8cfcd MB |
1496 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1497 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1498 | goto out; |
e48d4bbf | 1499 | |
265e9098 OK |
1500 | /* clear the flag since following operations may invalidate previously valid key */ |
1501 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1502 | ||
69a8cfcd | 1503 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1504 | goto out; |
e48d4bbf | 1505 | |
671ea6b4 | 1506 | r = crypt_setkey(cc); |
265e9098 OK |
1507 | if (!r) |
1508 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
de8be5ac MB |
1509 | |
1510 | out: | |
1511 | /* Hex key string not needed after here, so wipe it. */ | |
1512 | memset(key, '0', key_string_len); | |
1513 | ||
1514 | return r; | |
e48d4bbf MB |
1515 | } |
1516 | ||
1517 | static int crypt_wipe_key(struct crypt_config *cc) | |
1518 | { | |
1519 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1520 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 | 1521 | |
671ea6b4 | 1522 | return crypt_setkey(cc); |
e48d4bbf MB |
1523 | } |
1524 | ||
28513fcc MB |
1525 | static void crypt_dtr(struct dm_target *ti) |
1526 | { | |
1527 | struct crypt_config *cc = ti->private; | |
1528 | ||
1529 | ti->private = NULL; | |
1530 | ||
1531 | if (!cc) | |
1532 | return; | |
1533 | ||
f659b100 | 1534 | if (cc->write_thread) |
dc267621 MP |
1535 | kthread_stop(cc->write_thread); |
1536 | ||
28513fcc MB |
1537 | if (cc->io_queue) |
1538 | destroy_workqueue(cc->io_queue); | |
1539 | if (cc->crypt_queue) | |
1540 | destroy_workqueue(cc->crypt_queue); | |
1541 | ||
fd2d231f MP |
1542 | crypt_free_tfms(cc); |
1543 | ||
28513fcc MB |
1544 | if (cc->bs) |
1545 | bioset_free(cc->bs); | |
1546 | ||
6f65985e JL |
1547 | mempool_destroy(cc->page_pool); |
1548 | mempool_destroy(cc->req_pool); | |
28513fcc MB |
1549 | |
1550 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1551 | cc->iv_gen_ops->dtr(cc); | |
1552 | ||
28513fcc MB |
1553 | if (cc->dev) |
1554 | dm_put_device(ti, cc->dev); | |
1555 | ||
5ebaee6d | 1556 | kzfree(cc->cipher); |
7dbcd137 | 1557 | kzfree(cc->cipher_string); |
28513fcc MB |
1558 | |
1559 | /* Must zero key material before freeing */ | |
1560 | kzfree(cc); | |
1561 | } | |
1562 | ||
5ebaee6d MB |
1563 | static int crypt_ctr_cipher(struct dm_target *ti, |
1564 | char *cipher_in, char *key) | |
1da177e4 | 1565 | { |
5ebaee6d | 1566 | struct crypt_config *cc = ti->private; |
d1f96423 | 1567 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1568 | char *cipher_api = NULL; |
fd2d231f | 1569 | int ret = -EINVAL; |
31998ef1 | 1570 | char dummy; |
1da177e4 | 1571 | |
5ebaee6d MB |
1572 | /* Convert to crypto api definition? */ |
1573 | if (strchr(cipher_in, '(')) { | |
1574 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1575 | return -EINVAL; |
1576 | } | |
1577 | ||
7dbcd137 MB |
1578 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1579 | if (!cc->cipher_string) | |
1580 | goto bad_mem; | |
1581 | ||
5ebaee6d MB |
1582 | /* |
1583 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1584 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1585 | */ |
1586 | tmp = cipher_in; | |
d1f96423 MB |
1587 | keycount = strsep(&tmp, "-"); |
1588 | cipher = strsep(&keycount, ":"); | |
1589 | ||
1590 | if (!keycount) | |
1591 | cc->tfms_count = 1; | |
31998ef1 | 1592 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1593 | !is_power_of_2(cc->tfms_count)) { |
1594 | ti->error = "Bad cipher key count specification"; | |
1595 | return -EINVAL; | |
1596 | } | |
1597 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1598 | cc->key_extra_size = 0; |
5ebaee6d MB |
1599 | |
1600 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1601 | if (!cc->cipher) | |
1602 | goto bad_mem; | |
1603 | ||
1da177e4 LT |
1604 | chainmode = strsep(&tmp, "-"); |
1605 | ivopts = strsep(&tmp, "-"); | |
1606 | ivmode = strsep(&ivopts, ":"); | |
1607 | ||
1608 | if (tmp) | |
5ebaee6d | 1609 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1610 | |
7dbcd137 MB |
1611 | /* |
1612 | * For compatibility with the original dm-crypt mapping format, if | |
1613 | * only the cipher name is supplied, use cbc-plain. | |
1614 | */ | |
5ebaee6d | 1615 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1616 | chainmode = "cbc"; |
1617 | ivmode = "plain"; | |
1618 | } | |
1619 | ||
d1806f6a | 1620 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1621 | ti->error = "IV mechanism required"; |
1622 | return -EINVAL; | |
1da177e4 LT |
1623 | } |
1624 | ||
5ebaee6d MB |
1625 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1626 | if (!cipher_api) | |
1627 | goto bad_mem; | |
1628 | ||
1629 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1630 | "%s(%s)", chainmode, cipher); | |
1631 | if (ret < 0) { | |
1632 | kfree(cipher_api); | |
1633 | goto bad_mem; | |
1da177e4 LT |
1634 | } |
1635 | ||
5ebaee6d | 1636 | /* Allocate cipher */ |
fd2d231f MP |
1637 | ret = crypt_alloc_tfms(cc, cipher_api); |
1638 | if (ret < 0) { | |
1639 | ti->error = "Error allocating crypto tfm"; | |
1640 | goto bad; | |
1da177e4 | 1641 | } |
1da177e4 | 1642 | |
5ebaee6d | 1643 | /* Initialize IV */ |
bbdb23b5 | 1644 | cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1645 | if (cc->iv_size) |
1646 | /* at least a 64 bit sector number should fit in our buffer */ | |
1647 | cc->iv_size = max(cc->iv_size, | |
1648 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1649 | else if (ivmode) { | |
1650 | DMWARN("Selected cipher does not support IVs"); | |
1651 | ivmode = NULL; | |
1652 | } | |
1653 | ||
1654 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1655 | if (ivmode == NULL) |
1656 | cc->iv_gen_ops = NULL; | |
1657 | else if (strcmp(ivmode, "plain") == 0) | |
1658 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1659 | else if (strcmp(ivmode, "plain64") == 0) |
1660 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1661 | else if (strcmp(ivmode, "essiv") == 0) |
1662 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1663 | else if (strcmp(ivmode, "benbi") == 0) |
1664 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1665 | else if (strcmp(ivmode, "null") == 0) |
1666 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1667 | else if (strcmp(ivmode, "lmk") == 0) { |
1668 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1669 | /* |
1670 | * Version 2 and 3 is recognised according | |
34745785 MB |
1671 | * to length of provided multi-key string. |
1672 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1673 | * All keys (including IV seed) are always the same size. |
34745785 | 1674 | */ |
da31a078 | 1675 | if (cc->key_size % cc->key_parts) { |
34745785 | 1676 | cc->key_parts++; |
da31a078 MB |
1677 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1678 | } | |
ed04d981 MB |
1679 | } else if (strcmp(ivmode, "tcw") == 0) { |
1680 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1681 | cc->key_parts += 2; /* IV + whitening */ | |
1682 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1683 | } else { |
5ebaee6d | 1684 | ret = -EINVAL; |
72d94861 | 1685 | ti->error = "Invalid IV mode"; |
28513fcc | 1686 | goto bad; |
1da177e4 LT |
1687 | } |
1688 | ||
da31a078 MB |
1689 | /* Initialize and set key */ |
1690 | ret = crypt_set_key(cc, key); | |
1691 | if (ret < 0) { | |
1692 | ti->error = "Error decoding and setting key"; | |
1693 | goto bad; | |
1694 | } | |
1695 | ||
28513fcc MB |
1696 | /* Allocate IV */ |
1697 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1698 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1699 | if (ret < 0) { | |
1700 | ti->error = "Error creating IV"; | |
1701 | goto bad; | |
1702 | } | |
1703 | } | |
1da177e4 | 1704 | |
28513fcc MB |
1705 | /* Initialize IV (set keys for ESSIV etc) */ |
1706 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1707 | ret = cc->iv_gen_ops->init(cc); | |
1708 | if (ret < 0) { | |
1709 | ti->error = "Error initialising IV"; | |
1710 | goto bad; | |
1711 | } | |
b95bf2d3 MB |
1712 | } |
1713 | ||
5ebaee6d MB |
1714 | ret = 0; |
1715 | bad: | |
1716 | kfree(cipher_api); | |
1717 | return ret; | |
1718 | ||
1719 | bad_mem: | |
1720 | ti->error = "Cannot allocate cipher strings"; | |
1721 | return -ENOMEM; | |
1722 | } | |
1723 | ||
1724 | /* | |
1725 | * Construct an encryption mapping: | |
1726 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1727 | */ | |
1728 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1729 | { | |
1730 | struct crypt_config *cc; | |
772ae5f5 | 1731 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1732 | unsigned long long tmpll; |
1733 | int ret; | |
d49ec52f | 1734 | size_t iv_size_padding; |
772ae5f5 MB |
1735 | struct dm_arg_set as; |
1736 | const char *opt_string; | |
31998ef1 | 1737 | char dummy; |
772ae5f5 MB |
1738 | |
1739 | static struct dm_arg _args[] = { | |
0f5d8e6e | 1740 | {0, 3, "Invalid number of feature args"}, |
772ae5f5 | 1741 | }; |
5ebaee6d | 1742 | |
772ae5f5 | 1743 | if (argc < 5) { |
5ebaee6d MB |
1744 | ti->error = "Not enough arguments"; |
1745 | return -EINVAL; | |
1da177e4 LT |
1746 | } |
1747 | ||
5ebaee6d MB |
1748 | key_size = strlen(argv[1]) >> 1; |
1749 | ||
1750 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1751 | if (!cc) { | |
1752 | ti->error = "Cannot allocate encryption context"; | |
1753 | return -ENOMEM; | |
1754 | } | |
69a8cfcd | 1755 | cc->key_size = key_size; |
5ebaee6d MB |
1756 | |
1757 | ti->private = cc; | |
1758 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1759 | if (ret < 0) | |
1760 | goto bad; | |
1761 | ||
bbdb23b5 HX |
1762 | cc->dmreq_start = sizeof(struct skcipher_request); |
1763 | cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); | |
d49ec52f MP |
1764 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1765 | ||
bbdb23b5 | 1766 | if (crypto_skcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { |
d49ec52f MP |
1767 | /* Allocate the padding exactly */ |
1768 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
bbdb23b5 | 1769 | & crypto_skcipher_alignmask(any_tfm(cc)); |
d49ec52f MP |
1770 | } else { |
1771 | /* | |
1772 | * If the cipher requires greater alignment than kmalloc | |
1773 | * alignment, we don't know the exact position of the | |
1774 | * initialization vector. We must assume worst case. | |
1775 | */ | |
bbdb23b5 | 1776 | iv_size_padding = crypto_skcipher_alignmask(any_tfm(cc)); |
d49ec52f | 1777 | } |
ddd42edf | 1778 | |
94f5e024 | 1779 | ret = -ENOMEM; |
ddd42edf | 1780 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
d49ec52f | 1781 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1782 | if (!cc->req_pool) { |
1783 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1784 | goto bad; |
ddd42edf | 1785 | } |
ddd42edf | 1786 | |
30187e1d | 1787 | cc->per_bio_data_size = ti->per_io_data_size = |
d49ec52f MP |
1788 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1789 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1790 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1791 | |
cf2f1abf | 1792 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
1da177e4 | 1793 | if (!cc->page_pool) { |
72d94861 | 1794 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1795 | goto bad; |
1da177e4 LT |
1796 | } |
1797 | ||
bb799ca0 | 1798 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1799 | if (!cc->bs) { |
1800 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1801 | goto bad; |
6a24c718 MB |
1802 | } |
1803 | ||
7145c241 MP |
1804 | mutex_init(&cc->bio_alloc_lock); |
1805 | ||
28513fcc | 1806 | ret = -EINVAL; |
31998ef1 | 1807 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1808 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1809 | goto bad; |
1da177e4 | 1810 | } |
4ee218cd | 1811 | cc->iv_offset = tmpll; |
1da177e4 | 1812 | |
e80d1c80 VG |
1813 | ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); |
1814 | if (ret) { | |
28513fcc MB |
1815 | ti->error = "Device lookup failed"; |
1816 | goto bad; | |
1817 | } | |
1818 | ||
e80d1c80 | 1819 | ret = -EINVAL; |
31998ef1 | 1820 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1821 | ti->error = "Invalid device sector"; |
28513fcc | 1822 | goto bad; |
1da177e4 | 1823 | } |
4ee218cd | 1824 | cc->start = tmpll; |
1da177e4 | 1825 | |
772ae5f5 MB |
1826 | argv += 5; |
1827 | argc -= 5; | |
1828 | ||
1829 | /* Optional parameters */ | |
1830 | if (argc) { | |
1831 | as.argc = argc; | |
1832 | as.argv = argv; | |
1833 | ||
1834 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1835 | if (ret) | |
1836 | goto bad; | |
1837 | ||
44c144f9 | 1838 | ret = -EINVAL; |
f3396c58 MP |
1839 | while (opt_params--) { |
1840 | opt_string = dm_shift_arg(&as); | |
1841 | if (!opt_string) { | |
1842 | ti->error = "Not enough feature arguments"; | |
1843 | goto bad; | |
1844 | } | |
772ae5f5 | 1845 | |
f3396c58 MP |
1846 | if (!strcasecmp(opt_string, "allow_discards")) |
1847 | ti->num_discard_bios = 1; | |
1848 | ||
1849 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
1850 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1851 | ||
0f5d8e6e MP |
1852 | else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) |
1853 | set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); | |
1854 | ||
f3396c58 MP |
1855 | else { |
1856 | ti->error = "Invalid feature arguments"; | |
1857 | goto bad; | |
1858 | } | |
772ae5f5 MB |
1859 | } |
1860 | } | |
1861 | ||
28513fcc | 1862 | ret = -ENOMEM; |
670368a8 | 1863 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1864 | if (!cc->io_queue) { |
1865 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1866 | goto bad; |
cabf08e4 MB |
1867 | } |
1868 | ||
f3396c58 MP |
1869 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
1870 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); | |
1871 | else | |
1872 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1873 | num_online_cpus()); | |
cabf08e4 | 1874 | if (!cc->crypt_queue) { |
9934a8be | 1875 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1876 | goto bad; |
9934a8be MB |
1877 | } |
1878 | ||
dc267621 | 1879 | init_waitqueue_head(&cc->write_thread_wait); |
b3c5fd30 | 1880 | cc->write_tree = RB_ROOT; |
dc267621 MP |
1881 | |
1882 | cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); | |
1883 | if (IS_ERR(cc->write_thread)) { | |
1884 | ret = PTR_ERR(cc->write_thread); | |
1885 | cc->write_thread = NULL; | |
1886 | ti->error = "Couldn't spawn write thread"; | |
1887 | goto bad; | |
1888 | } | |
1889 | wake_up_process(cc->write_thread); | |
1890 | ||
55a62eef | 1891 | ti->num_flush_bios = 1; |
0ac55489 | 1892 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1893 | |
1da177e4 LT |
1894 | return 0; |
1895 | ||
28513fcc MB |
1896 | bad: |
1897 | crypt_dtr(ti); | |
1898 | return ret; | |
1da177e4 LT |
1899 | } |
1900 | ||
7de3ee57 | 1901 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1902 | { |
028867ac | 1903 | struct dm_crypt_io *io; |
49a8a920 | 1904 | struct crypt_config *cc = ti->private; |
647c7db1 | 1905 | |
772ae5f5 | 1906 | /* |
28a8f0d3 MC |
1907 | * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. |
1908 | * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight | |
e6047149 | 1909 | * - for REQ_OP_DISCARD caller must use flush if IO ordering matters |
772ae5f5 | 1910 | */ |
1eff9d32 | 1911 | if (unlikely(bio->bi_opf & REQ_PREFLUSH || |
28a8f0d3 | 1912 | bio_op(bio) == REQ_OP_DISCARD)) { |
647c7db1 | 1913 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1914 | if (bio_sectors(bio)) |
4f024f37 KO |
1915 | bio->bi_iter.bi_sector = cc->start + |
1916 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1917 | return DM_MAPIO_REMAPPED; |
1918 | } | |
1da177e4 | 1919 | |
4e870e94 MP |
1920 | /* |
1921 | * Check if bio is too large, split as needed. | |
1922 | */ | |
1923 | if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && | |
1924 | bio_data_dir(bio) == WRITE) | |
1925 | dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); | |
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"); |