Commit | Line | Data |
---|---|---|
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> | |
1da177e4 | 31 | |
586e80e6 | 32 | #include <linux/device-mapper.h> |
1da177e4 | 33 | |
72d94861 | 34 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 35 | |
1da177e4 LT |
36 | /* |
37 | * context holding the current state of a multi-part conversion | |
38 | */ | |
39 | struct convert_context { | |
43d69034 | 40 | struct completion restart; |
1da177e4 LT |
41 | struct bio *bio_in; |
42 | struct bio *bio_out; | |
003b5c57 KO |
43 | struct bvec_iter iter_in; |
44 | struct bvec_iter iter_out; | |
c66029f4 | 45 | sector_t cc_sector; |
40b6229b | 46 | atomic_t cc_pending; |
610f2de3 | 47 | struct ablkcipher_request *req; |
1da177e4 LT |
48 | }; |
49 | ||
53017030 MB |
50 | /* |
51 | * per bio private data | |
52 | */ | |
53 | struct dm_crypt_io { | |
49a8a920 | 54 | struct crypt_config *cc; |
53017030 MB |
55 | struct bio *base_bio; |
56 | struct work_struct work; | |
57 | ||
58 | struct convert_context ctx; | |
59 | ||
40b6229b | 60 | atomic_t io_pending; |
53017030 | 61 | int error; |
0c395b0f | 62 | sector_t sector; |
dc267621 | 63 | |
b3c5fd30 | 64 | struct rb_node rb_node; |
298a9fa0 | 65 | } CRYPTO_MINALIGN_ATTR; |
53017030 | 66 | |
01482b76 | 67 | struct dm_crypt_request { |
b2174eeb | 68 | struct convert_context *ctx; |
01482b76 MB |
69 | struct scatterlist sg_in; |
70 | struct scatterlist sg_out; | |
2dc5327d | 71 | sector_t iv_sector; |
01482b76 MB |
72 | }; |
73 | ||
1da177e4 LT |
74 | struct crypt_config; |
75 | ||
76 | struct crypt_iv_operations { | |
77 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 78 | const char *opts); |
1da177e4 | 79 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 80 | int (*init)(struct crypt_config *cc); |
542da317 | 81 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
82 | int (*generator)(struct crypt_config *cc, u8 *iv, |
83 | struct dm_crypt_request *dmreq); | |
84 | int (*post)(struct crypt_config *cc, u8 *iv, | |
85 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
86 | }; |
87 | ||
60473592 | 88 | struct iv_essiv_private { |
b95bf2d3 MB |
89 | struct crypto_hash *hash_tfm; |
90 | u8 *salt; | |
60473592 MB |
91 | }; |
92 | ||
93 | struct iv_benbi_private { | |
94 | int shift; | |
95 | }; | |
96 | ||
34745785 MB |
97 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
98 | struct iv_lmk_private { | |
99 | struct crypto_shash *hash_tfm; | |
100 | u8 *seed; | |
101 | }; | |
102 | ||
ed04d981 MB |
103 | #define TCW_WHITENING_SIZE 16 |
104 | struct iv_tcw_private { | |
105 | struct crypto_shash *crc32_tfm; | |
106 | u8 *iv_seed; | |
107 | u8 *whitening; | |
108 | }; | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * Crypt: maps a linear range of a block device | |
112 | * and encrypts / decrypts at the same time. | |
113 | */ | |
0f5d8e6e MP |
114 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, |
115 | DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; | |
c0297721 AK |
116 | |
117 | /* | |
610f2de3 | 118 | * The fields in here must be read only after initialization. |
c0297721 | 119 | */ |
1da177e4 LT |
120 | struct crypt_config { |
121 | struct dm_dev *dev; | |
122 | sector_t start; | |
123 | ||
124 | /* | |
ddd42edf MB |
125 | * pool for per bio private data, crypto requests and |
126 | * encryption requeusts/buffer pages | |
1da177e4 | 127 | */ |
ddd42edf | 128 | mempool_t *req_pool; |
1da177e4 | 129 | mempool_t *page_pool; |
6a24c718 | 130 | struct bio_set *bs; |
7145c241 | 131 | struct mutex bio_alloc_lock; |
1da177e4 | 132 | |
cabf08e4 MB |
133 | struct workqueue_struct *io_queue; |
134 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 135 | |
dc267621 MP |
136 | struct task_struct *write_thread; |
137 | wait_queue_head_t write_thread_wait; | |
b3c5fd30 | 138 | struct rb_root write_tree; |
dc267621 | 139 | |
5ebaee6d | 140 | char *cipher; |
7dbcd137 | 141 | char *cipher_string; |
5ebaee6d | 142 | |
1da177e4 | 143 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 144 | union { |
60473592 MB |
145 | struct iv_essiv_private essiv; |
146 | struct iv_benbi_private benbi; | |
34745785 | 147 | struct iv_lmk_private lmk; |
ed04d981 | 148 | struct iv_tcw_private tcw; |
79066ad3 | 149 | } iv_gen_private; |
1da177e4 LT |
150 | sector_t iv_offset; |
151 | unsigned int iv_size; | |
152 | ||
fd2d231f MP |
153 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
154 | void *iv_private; | |
155 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 156 | unsigned tfms_count; |
c0297721 | 157 | |
ddd42edf MB |
158 | /* |
159 | * Layout of each crypto request: | |
160 | * | |
161 | * struct ablkcipher_request | |
162 | * context | |
163 | * padding | |
164 | * struct dm_crypt_request | |
165 | * padding | |
166 | * IV | |
167 | * | |
168 | * The padding is added so that dm_crypt_request and the IV are | |
169 | * correctly aligned. | |
170 | */ | |
171 | unsigned int dmreq_start; | |
ddd42edf | 172 | |
298a9fa0 MP |
173 | unsigned int per_bio_data_size; |
174 | ||
e48d4bbf | 175 | unsigned long flags; |
1da177e4 | 176 | unsigned int key_size; |
da31a078 MB |
177 | unsigned int key_parts; /* independent parts in key buffer */ |
178 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
179 | u8 key[0]; |
180 | }; | |
181 | ||
6a24c718 | 182 | #define MIN_IOS 16 |
1da177e4 | 183 | |
028867ac | 184 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 185 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 186 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 187 | |
c0297721 AK |
188 | /* |
189 | * Use this to access cipher attributes that are the same for each CPU. | |
190 | */ | |
191 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
192 | { | |
fd2d231f | 193 | return cc->tfms[0]; |
c0297721 AK |
194 | } |
195 | ||
1da177e4 LT |
196 | /* |
197 | * Different IV generation algorithms: | |
198 | * | |
3c164bd8 | 199 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 200 | * number, padded with zeros if necessary. |
1da177e4 | 201 | * |
61afef61 MB |
202 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
203 | * number, padded with zeros if necessary. | |
204 | * | |
3c164bd8 RS |
205 | * essiv: "encrypted sector|salt initial vector", the sector number is |
206 | * encrypted with the bulk cipher using a salt as key. The salt | |
207 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 208 | * |
48527fa7 RS |
209 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
210 | * (needed for LRW-32-AES and possible other narrow block modes) | |
211 | * | |
46b47730 LN |
212 | * null: the initial vector is always zero. Provides compatibility with |
213 | * obsolete loop_fish2 devices. Do not use for new devices. | |
214 | * | |
34745785 MB |
215 | * lmk: Compatible implementation of the block chaining mode used |
216 | * by the Loop-AES block device encryption system | |
217 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
218 | * It operates on full 512 byte sectors and uses CBC | |
219 | * with an IV derived from the sector number, the data and | |
220 | * optionally extra IV seed. | |
221 | * This means that after decryption the first block | |
222 | * of sector must be tweaked according to decrypted data. | |
223 | * Loop-AES can use three encryption schemes: | |
224 | * version 1: is plain aes-cbc mode | |
225 | * version 2: uses 64 multikey scheme with lmk IV generator | |
226 | * version 3: the same as version 2 with additional IV seed | |
227 | * (it uses 65 keys, last key is used as IV seed) | |
228 | * | |
ed04d981 MB |
229 | * tcw: Compatible implementation of the block chaining mode used |
230 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
e44f23b3 | 231 | * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat |
ed04d981 MB |
232 | * It operates on full 512 byte sectors and uses CBC |
233 | * with an IV derived from initial key and the sector number. | |
234 | * In addition, whitening value is applied on every sector, whitening | |
235 | * is calculated from initial key, sector number and mixed using CRC32. | |
236 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
237 | * and should be used for old compatible containers access only. | |
238 | * | |
1da177e4 LT |
239 | * plumb: unimplemented, see: |
240 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
241 | */ | |
242 | ||
2dc5327d MB |
243 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
244 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
245 | { |
246 | memset(iv, 0, cc->iv_size); | |
283a8328 | 247 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
248 | |
249 | return 0; | |
250 | } | |
251 | ||
61afef61 | 252 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 253 | struct dm_crypt_request *dmreq) |
61afef61 MB |
254 | { |
255 | memset(iv, 0, cc->iv_size); | |
283a8328 | 256 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
257 | |
258 | return 0; | |
259 | } | |
260 | ||
b95bf2d3 MB |
261 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
262 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
263 | { | |
264 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
265 | struct hash_desc desc; | |
266 | struct scatterlist sg; | |
c0297721 | 267 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 268 | int err; |
b95bf2d3 MB |
269 | |
270 | sg_init_one(&sg, cc->key, cc->key_size); | |
271 | desc.tfm = essiv->hash_tfm; | |
272 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
273 | ||
274 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
275 | if (err) | |
276 | return err; | |
277 | ||
fd2d231f | 278 | essiv_tfm = cc->iv_private; |
c0297721 | 279 | |
fd2d231f MP |
280 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
281 | crypto_hash_digestsize(essiv->hash_tfm)); | |
282 | if (err) | |
283 | return err; | |
c0297721 AK |
284 | |
285 | return 0; | |
b95bf2d3 MB |
286 | } |
287 | ||
542da317 MB |
288 | /* Wipe salt and reset key derived from volume key */ |
289 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
290 | { | |
291 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
292 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 293 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 294 | int r, err = 0; |
542da317 MB |
295 | |
296 | memset(essiv->salt, 0, salt_size); | |
297 | ||
fd2d231f MP |
298 | essiv_tfm = cc->iv_private; |
299 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
300 | if (r) | |
301 | err = r; | |
c0297721 AK |
302 | |
303 | return err; | |
304 | } | |
305 | ||
306 | /* Set up per cpu cipher state */ | |
307 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
308 | struct dm_target *ti, | |
309 | u8 *salt, unsigned saltsize) | |
310 | { | |
311 | struct crypto_cipher *essiv_tfm; | |
312 | int err; | |
313 | ||
314 | /* Setup the essiv_tfm with the given salt */ | |
315 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
316 | if (IS_ERR(essiv_tfm)) { | |
317 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
318 | return essiv_tfm; | |
319 | } | |
320 | ||
321 | if (crypto_cipher_blocksize(essiv_tfm) != | |
322 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
323 | ti->error = "Block size of ESSIV cipher does " | |
324 | "not match IV size of block cipher"; | |
325 | crypto_free_cipher(essiv_tfm); | |
326 | return ERR_PTR(-EINVAL); | |
327 | } | |
328 | ||
329 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
330 | if (err) { | |
331 | ti->error = "Failed to set key for ESSIV cipher"; | |
332 | crypto_free_cipher(essiv_tfm); | |
333 | return ERR_PTR(err); | |
334 | } | |
335 | ||
336 | return essiv_tfm; | |
542da317 MB |
337 | } |
338 | ||
60473592 MB |
339 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
340 | { | |
c0297721 | 341 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
342 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
343 | ||
b95bf2d3 MB |
344 | crypto_free_hash(essiv->hash_tfm); |
345 | essiv->hash_tfm = NULL; | |
346 | ||
347 | kzfree(essiv->salt); | |
348 | essiv->salt = NULL; | |
c0297721 | 349 | |
fd2d231f | 350 | essiv_tfm = cc->iv_private; |
c0297721 | 351 | |
fd2d231f MP |
352 | if (essiv_tfm) |
353 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 354 | |
fd2d231f | 355 | cc->iv_private = NULL; |
60473592 MB |
356 | } |
357 | ||
1da177e4 | 358 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 359 | const char *opts) |
1da177e4 | 360 | { |
5861f1be MB |
361 | struct crypto_cipher *essiv_tfm = NULL; |
362 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 363 | u8 *salt = NULL; |
fd2d231f | 364 | int err; |
1da177e4 | 365 | |
5861f1be | 366 | if (!opts) { |
72d94861 | 367 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
368 | return -EINVAL; |
369 | } | |
370 | ||
b95bf2d3 | 371 | /* Allocate hash algorithm */ |
35058687 HX |
372 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
373 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 374 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
375 | err = PTR_ERR(hash_tfm); |
376 | goto bad; | |
1da177e4 LT |
377 | } |
378 | ||
b95bf2d3 | 379 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 380 | if (!salt) { |
72d94861 | 381 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
382 | err = -ENOMEM; |
383 | goto bad; | |
1da177e4 LT |
384 | } |
385 | ||
b95bf2d3 | 386 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
387 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
388 | ||
fd2d231f MP |
389 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
390 | crypto_hash_digestsize(hash_tfm)); | |
391 | if (IS_ERR(essiv_tfm)) { | |
392 | crypt_iv_essiv_dtr(cc); | |
393 | return PTR_ERR(essiv_tfm); | |
c0297721 | 394 | } |
fd2d231f | 395 | cc->iv_private = essiv_tfm; |
c0297721 | 396 | |
1da177e4 | 397 | return 0; |
5861f1be MB |
398 | |
399 | bad: | |
5861f1be MB |
400 | if (hash_tfm && !IS_ERR(hash_tfm)) |
401 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 402 | kfree(salt); |
5861f1be | 403 | return err; |
1da177e4 LT |
404 | } |
405 | ||
2dc5327d MB |
406 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
407 | struct dm_crypt_request *dmreq) | |
1da177e4 | 408 | { |
fd2d231f | 409 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 410 | |
1da177e4 | 411 | memset(iv, 0, cc->iv_size); |
283a8328 | 412 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
413 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
414 | ||
1da177e4 LT |
415 | return 0; |
416 | } | |
417 | ||
48527fa7 RS |
418 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
419 | const char *opts) | |
420 | { | |
c0297721 | 421 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 422 | int log = ilog2(bs); |
48527fa7 RS |
423 | |
424 | /* we need to calculate how far we must shift the sector count | |
425 | * to get the cipher block count, we use this shift in _gen */ | |
426 | ||
427 | if (1 << log != bs) { | |
428 | ti->error = "cypher blocksize is not a power of 2"; | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
432 | if (log > 9) { | |
433 | ti->error = "cypher blocksize is > 512"; | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
60473592 | 437 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
438 | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
443 | { | |
48527fa7 RS |
444 | } |
445 | ||
2dc5327d MB |
446 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
447 | struct dm_crypt_request *dmreq) | |
48527fa7 | 448 | { |
79066ad3 HX |
449 | __be64 val; |
450 | ||
48527fa7 | 451 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 452 | |
2dc5327d | 453 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 454 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 455 | |
1da177e4 LT |
456 | return 0; |
457 | } | |
458 | ||
2dc5327d MB |
459 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
460 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
461 | { |
462 | memset(iv, 0, cc->iv_size); | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
34745785 MB |
467 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
468 | { | |
469 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
470 | ||
471 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
472 | crypto_free_shash(lmk->hash_tfm); | |
473 | lmk->hash_tfm = NULL; | |
474 | ||
475 | kzfree(lmk->seed); | |
476 | lmk->seed = NULL; | |
477 | } | |
478 | ||
479 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
480 | const char *opts) | |
481 | { | |
482 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
483 | ||
484 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
485 | if (IS_ERR(lmk->hash_tfm)) { | |
486 | ti->error = "Error initializing LMK hash"; | |
487 | return PTR_ERR(lmk->hash_tfm); | |
488 | } | |
489 | ||
490 | /* No seed in LMK version 2 */ | |
491 | if (cc->key_parts == cc->tfms_count) { | |
492 | lmk->seed = NULL; | |
493 | return 0; | |
494 | } | |
495 | ||
496 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
497 | if (!lmk->seed) { | |
498 | crypt_iv_lmk_dtr(cc); | |
499 | ti->error = "Error kmallocing seed storage in LMK"; | |
500 | return -ENOMEM; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
507 | { | |
508 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
509 | int subkey_size = cc->key_size / cc->key_parts; | |
510 | ||
511 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
512 | if (lmk->seed) | |
513 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
514 | crypto_shash_digestsize(lmk->hash_tfm)); | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
520 | { | |
521 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
522 | ||
523 | if (lmk->seed) | |
524 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
530 | struct dm_crypt_request *dmreq, | |
531 | u8 *data) | |
532 | { | |
533 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 534 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 535 | struct md5_state md5state; |
da31a078 | 536 | __le32 buf[4]; |
34745785 MB |
537 | int i, r; |
538 | ||
b6106265 JSM |
539 | desc->tfm = lmk->hash_tfm; |
540 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
34745785 | 541 | |
b6106265 | 542 | r = crypto_shash_init(desc); |
34745785 MB |
543 | if (r) |
544 | return r; | |
545 | ||
546 | if (lmk->seed) { | |
b6106265 | 547 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
548 | if (r) |
549 | return r; | |
550 | } | |
551 | ||
552 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 553 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
554 | if (r) |
555 | return r; | |
556 | ||
557 | /* Sector is cropped to 56 bits here */ | |
558 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
559 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
560 | buf[2] = cpu_to_le32(4024); | |
561 | buf[3] = 0; | |
b6106265 | 562 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
563 | if (r) |
564 | return r; | |
565 | ||
566 | /* No MD5 padding here */ | |
b6106265 | 567 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
568 | if (r) |
569 | return r; | |
570 | ||
571 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
572 | __cpu_to_le32s(&md5state.hash[i]); | |
573 | memcpy(iv, &md5state.hash, cc->iv_size); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
579 | struct dm_crypt_request *dmreq) | |
580 | { | |
581 | u8 *src; | |
582 | int r = 0; | |
583 | ||
584 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 585 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 586 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 587 | kunmap_atomic(src); |
34745785 MB |
588 | } else |
589 | memset(iv, 0, cc->iv_size); | |
590 | ||
591 | return r; | |
592 | } | |
593 | ||
594 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
595 | struct dm_crypt_request *dmreq) | |
596 | { | |
597 | u8 *dst; | |
598 | int r; | |
599 | ||
600 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
601 | return 0; | |
602 | ||
c2e022cb | 603 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
604 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
605 | ||
606 | /* Tweak the first block of plaintext sector */ | |
607 | if (!r) | |
608 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
609 | ||
c2e022cb | 610 | kunmap_atomic(dst); |
34745785 MB |
611 | return r; |
612 | } | |
613 | ||
ed04d981 MB |
614 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
615 | { | |
616 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
617 | ||
618 | kzfree(tcw->iv_seed); | |
619 | tcw->iv_seed = NULL; | |
620 | kzfree(tcw->whitening); | |
621 | tcw->whitening = NULL; | |
622 | ||
623 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
624 | crypto_free_shash(tcw->crc32_tfm); | |
625 | tcw->crc32_tfm = NULL; | |
626 | } | |
627 | ||
628 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
629 | const char *opts) | |
630 | { | |
631 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
632 | ||
633 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
634 | ti->error = "Wrong key size for TCW"; | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
639 | if (IS_ERR(tcw->crc32_tfm)) { | |
640 | ti->error = "Error initializing CRC32 in TCW"; | |
641 | return PTR_ERR(tcw->crc32_tfm); | |
642 | } | |
643 | ||
644 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
645 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
646 | if (!tcw->iv_seed || !tcw->whitening) { | |
647 | crypt_iv_tcw_dtr(cc); | |
648 | ti->error = "Error allocating seed storage in TCW"; | |
649 | return -ENOMEM; | |
650 | } | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
656 | { | |
657 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
658 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
659 | ||
660 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
661 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
662 | TCW_WHITENING_SIZE); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
668 | { | |
669 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
670 | ||
671 | memset(tcw->iv_seed, 0, cc->iv_size); | |
672 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
678 | struct dm_crypt_request *dmreq, | |
679 | u8 *data) | |
680 | { | |
681 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
682 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
683 | u8 buf[TCW_WHITENING_SIZE]; | |
b6106265 | 684 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
685 | int i, r; |
686 | ||
687 | /* xor whitening with sector number */ | |
688 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
689 | crypto_xor(buf, (u8 *)§or, 8); | |
690 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
691 | ||
692 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 JSM |
693 | desc->tfm = tcw->crc32_tfm; |
694 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
ed04d981 | 695 | for (i = 0; i < 4; i++) { |
b6106265 | 696 | r = crypto_shash_init(desc); |
ed04d981 MB |
697 | if (r) |
698 | goto out; | |
b6106265 | 699 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
ed04d981 MB |
700 | if (r) |
701 | goto out; | |
b6106265 | 702 | r = crypto_shash_final(desc, &buf[i * 4]); |
ed04d981 MB |
703 | if (r) |
704 | goto out; | |
705 | } | |
706 | crypto_xor(&buf[0], &buf[12], 4); | |
707 | crypto_xor(&buf[4], &buf[8], 4); | |
708 | ||
709 | /* apply whitening (8 bytes) to whole sector */ | |
710 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
711 | crypto_xor(data + i * 8, buf, 8); | |
712 | out: | |
1a71d6ff | 713 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
714 | return r; |
715 | } | |
716 | ||
717 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
718 | struct dm_crypt_request *dmreq) | |
719 | { | |
720 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
721 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
722 | u8 *src; | |
723 | int r = 0; | |
724 | ||
725 | /* Remove whitening from ciphertext */ | |
726 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
727 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
728 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
729 | kunmap_atomic(src); | |
730 | } | |
731 | ||
732 | /* Calculate IV */ | |
733 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
734 | crypto_xor(iv, (u8 *)§or, 8); | |
735 | if (cc->iv_size > 8) | |
736 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
737 | ||
738 | return r; | |
739 | } | |
740 | ||
741 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
742 | struct dm_crypt_request *dmreq) | |
743 | { | |
744 | u8 *dst; | |
745 | int r; | |
746 | ||
747 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
748 | return 0; | |
749 | ||
750 | /* Apply whitening on ciphertext */ | |
751 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
752 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
753 | kunmap_atomic(dst); | |
754 | ||
755 | return r; | |
756 | } | |
757 | ||
1da177e4 LT |
758 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
759 | .generator = crypt_iv_plain_gen | |
760 | }; | |
761 | ||
61afef61 MB |
762 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
763 | .generator = crypt_iv_plain64_gen | |
764 | }; | |
765 | ||
1da177e4 LT |
766 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
767 | .ctr = crypt_iv_essiv_ctr, | |
768 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 769 | .init = crypt_iv_essiv_init, |
542da317 | 770 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
771 | .generator = crypt_iv_essiv_gen |
772 | }; | |
773 | ||
48527fa7 RS |
774 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
775 | .ctr = crypt_iv_benbi_ctr, | |
776 | .dtr = crypt_iv_benbi_dtr, | |
777 | .generator = crypt_iv_benbi_gen | |
778 | }; | |
1da177e4 | 779 | |
46b47730 LN |
780 | static struct crypt_iv_operations crypt_iv_null_ops = { |
781 | .generator = crypt_iv_null_gen | |
782 | }; | |
783 | ||
34745785 MB |
784 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
785 | .ctr = crypt_iv_lmk_ctr, | |
786 | .dtr = crypt_iv_lmk_dtr, | |
787 | .init = crypt_iv_lmk_init, | |
788 | .wipe = crypt_iv_lmk_wipe, | |
789 | .generator = crypt_iv_lmk_gen, | |
790 | .post = crypt_iv_lmk_post | |
791 | }; | |
792 | ||
ed04d981 MB |
793 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
794 | .ctr = crypt_iv_tcw_ctr, | |
795 | .dtr = crypt_iv_tcw_dtr, | |
796 | .init = crypt_iv_tcw_init, | |
797 | .wipe = crypt_iv_tcw_wipe, | |
798 | .generator = crypt_iv_tcw_gen, | |
799 | .post = crypt_iv_tcw_post | |
800 | }; | |
801 | ||
d469f841 MB |
802 | static void crypt_convert_init(struct crypt_config *cc, |
803 | struct convert_context *ctx, | |
804 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 805 | sector_t sector) |
1da177e4 LT |
806 | { |
807 | ctx->bio_in = bio_in; | |
808 | ctx->bio_out = bio_out; | |
003b5c57 KO |
809 | if (bio_in) |
810 | ctx->iter_in = bio_in->bi_iter; | |
811 | if (bio_out) | |
812 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 813 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 814 | init_completion(&ctx->restart); |
1da177e4 LT |
815 | } |
816 | ||
b2174eeb HY |
817 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
818 | struct ablkcipher_request *req) | |
819 | { | |
820 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
821 | } | |
822 | ||
823 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
824 | struct dm_crypt_request *dmreq) | |
825 | { | |
826 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
827 | } | |
828 | ||
2dc5327d MB |
829 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
830 | struct dm_crypt_request *dmreq) | |
831 | { | |
832 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
833 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
834 | } | |
835 | ||
01482b76 | 836 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
837 | struct convert_context *ctx, |
838 | struct ablkcipher_request *req) | |
01482b76 | 839 | { |
003b5c57 KO |
840 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
841 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
842 | struct dm_crypt_request *dmreq; |
843 | u8 *iv; | |
40b6229b | 844 | int r; |
3a7f6c99 | 845 | |
b2174eeb | 846 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 847 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 848 | |
c66029f4 | 849 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 850 | dmreq->ctx = ctx; |
3a7f6c99 | 851 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
852 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
853 | bv_in.bv_offset); | |
01482b76 | 854 | |
3a7f6c99 | 855 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
856 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
857 | bv_out.bv_offset); | |
01482b76 | 858 | |
003b5c57 KO |
859 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
860 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 861 | |
3a7f6c99 | 862 | if (cc->iv_gen_ops) { |
2dc5327d | 863 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
864 | if (r < 0) |
865 | return r; | |
866 | } | |
867 | ||
868 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
869 | 1 << SECTOR_SHIFT, iv); | |
870 | ||
871 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
872 | r = crypto_ablkcipher_encrypt(req); | |
873 | else | |
874 | r = crypto_ablkcipher_decrypt(req); | |
875 | ||
2dc5327d MB |
876 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
877 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
878 | ||
3a7f6c99 | 879 | return r; |
01482b76 MB |
880 | } |
881 | ||
95497a96 MB |
882 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
883 | int error); | |
c0297721 | 884 | |
ddd42edf MB |
885 | static void crypt_alloc_req(struct crypt_config *cc, |
886 | struct convert_context *ctx) | |
887 | { | |
c66029f4 | 888 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 889 | |
610f2de3 MP |
890 | if (!ctx->req) |
891 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 892 | |
610f2de3 | 893 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
54cea3f6 MB |
894 | |
895 | /* | |
896 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs | |
897 | * requests if driver request queue is full. | |
898 | */ | |
610f2de3 | 899 | ablkcipher_request_set_callback(ctx->req, |
c0297721 | 900 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 901 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
902 | } |
903 | ||
298a9fa0 MP |
904 | static void crypt_free_req(struct crypt_config *cc, |
905 | struct ablkcipher_request *req, struct bio *base_bio) | |
906 | { | |
907 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
908 | ||
909 | if ((struct ablkcipher_request *)(io + 1) != req) | |
910 | mempool_free(req, cc->req_pool); | |
911 | } | |
912 | ||
1da177e4 LT |
913 | /* |
914 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
915 | */ | |
916 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 917 | struct convert_context *ctx) |
1da177e4 | 918 | { |
3f1e9070 | 919 | int r; |
1da177e4 | 920 | |
40b6229b | 921 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 922 | |
003b5c57 | 923 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 924 | |
3a7f6c99 MB |
925 | crypt_alloc_req(cc, ctx); |
926 | ||
40b6229b | 927 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 928 | |
610f2de3 | 929 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
930 | |
931 | switch (r) { | |
54cea3f6 MB |
932 | /* |
933 | * The request was queued by a crypto driver | |
934 | * but the driver request queue is full, let's wait. | |
935 | */ | |
3a7f6c99 MB |
936 | case -EBUSY: |
937 | wait_for_completion(&ctx->restart); | |
16735d02 | 938 | reinit_completion(&ctx->restart); |
54cea3f6 MB |
939 | /* fall through */ |
940 | /* | |
941 | * The request is queued and processed asynchronously, | |
942 | * completion function kcryptd_async_done() will be called. | |
943 | */ | |
c0403ec0 | 944 | case -EINPROGRESS: |
610f2de3 | 945 | ctx->req = NULL; |
c66029f4 | 946 | ctx->cc_sector++; |
3f1e9070 | 947 | continue; |
54cea3f6 MB |
948 | /* |
949 | * The request was already processed (synchronously). | |
950 | */ | |
3a7f6c99 | 951 | case 0: |
40b6229b | 952 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 953 | ctx->cc_sector++; |
c7f1b204 | 954 | cond_resched(); |
3a7f6c99 | 955 | continue; |
3a7f6c99 | 956 | |
54cea3f6 | 957 | /* There was an error while processing the request. */ |
3f1e9070 | 958 | default: |
40b6229b | 959 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
960 | return r; |
961 | } | |
1da177e4 LT |
962 | } |
963 | ||
3f1e9070 | 964 | return 0; |
1da177e4 LT |
965 | } |
966 | ||
cf2f1abf MP |
967 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
968 | ||
1da177e4 LT |
969 | /* |
970 | * Generate a new unfragmented bio with the given size | |
971 | * This should never violate the device limitations | |
7145c241 MP |
972 | * |
973 | * This function may be called concurrently. If we allocate from the mempool | |
974 | * concurrently, there is a possibility of deadlock. For example, if we have | |
975 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from | |
976 | * the mempool concurrently, it may deadlock in a situation where both processes | |
977 | * have allocated 128 pages and the mempool is exhausted. | |
978 | * | |
979 | * In order to avoid this scenario we allocate the pages under a mutex. | |
980 | * | |
981 | * In order to not degrade performance with excessive locking, we try | |
982 | * non-blocking allocations without a mutex first but on failure we fallback | |
983 | * to blocking allocations with a mutex. | |
1da177e4 | 984 | */ |
cf2f1abf | 985 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
1da177e4 | 986 | { |
49a8a920 | 987 | struct crypt_config *cc = io->cc; |
8b004457 | 988 | struct bio *clone; |
1da177e4 | 989 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7145c241 MP |
990 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
991 | unsigned i, len, remaining_size; | |
91e10625 | 992 | struct page *page; |
cf2f1abf | 993 | struct bio_vec *bvec; |
1da177e4 | 994 | |
7145c241 MP |
995 | retry: |
996 | if (unlikely(gfp_mask & __GFP_WAIT)) | |
997 | mutex_lock(&cc->bio_alloc_lock); | |
998 | ||
2f9941b6 | 999 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 1000 | if (!clone) |
7145c241 | 1001 | goto return_clone; |
1da177e4 | 1002 | |
027581f3 | 1003 | clone_init(io, clone); |
6a24c718 | 1004 | |
7145c241 MP |
1005 | remaining_size = size; |
1006 | ||
f97380bc | 1007 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 1008 | page = mempool_alloc(cc->page_pool, gfp_mask); |
7145c241 MP |
1009 | if (!page) { |
1010 | crypt_free_buffer_pages(cc, clone); | |
1011 | bio_put(clone); | |
1012 | gfp_mask |= __GFP_WAIT; | |
1013 | goto retry; | |
1014 | } | |
1da177e4 | 1015 | |
7145c241 | 1016 | len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; |
91e10625 | 1017 | |
cf2f1abf MP |
1018 | bvec = &clone->bi_io_vec[clone->bi_vcnt++]; |
1019 | bvec->bv_page = page; | |
1020 | bvec->bv_len = len; | |
1021 | bvec->bv_offset = 0; | |
1da177e4 | 1022 | |
cf2f1abf | 1023 | clone->bi_iter.bi_size += len; |
1da177e4 | 1024 | |
7145c241 | 1025 | remaining_size -= len; |
1da177e4 LT |
1026 | } |
1027 | ||
7145c241 MP |
1028 | return_clone: |
1029 | if (unlikely(gfp_mask & __GFP_WAIT)) | |
1030 | mutex_unlock(&cc->bio_alloc_lock); | |
1031 | ||
8b004457 | 1032 | return clone; |
1da177e4 LT |
1033 | } |
1034 | ||
644bd2f0 | 1035 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1036 | { |
644bd2f0 | 1037 | unsigned int i; |
1da177e4 LT |
1038 | struct bio_vec *bv; |
1039 | ||
cb34e057 | 1040 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1041 | BUG_ON(!bv->bv_page); |
1042 | mempool_free(bv->bv_page, cc->page_pool); | |
1043 | bv->bv_page = NULL; | |
1044 | } | |
1045 | } | |
1046 | ||
298a9fa0 MP |
1047 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1048 | struct bio *bio, sector_t sector) | |
dc440d1e | 1049 | { |
49a8a920 | 1050 | io->cc = cc; |
dc440d1e MB |
1051 | io->base_bio = bio; |
1052 | io->sector = sector; | |
1053 | io->error = 0; | |
610f2de3 | 1054 | io->ctx.req = NULL; |
40b6229b | 1055 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1056 | } |
1057 | ||
3e1a8bdd MB |
1058 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1059 | { | |
40b6229b | 1060 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1061 | } |
1062 | ||
1da177e4 LT |
1063 | /* |
1064 | * One of the bios was finished. Check for completion of | |
1065 | * the whole request and correctly clean up the buffer. | |
1066 | */ | |
5742fd77 | 1067 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1068 | { |
49a8a920 | 1069 | struct crypt_config *cc = io->cc; |
b35f8caa | 1070 | struct bio *base_bio = io->base_bio; |
b35f8caa | 1071 | int error = io->error; |
1da177e4 | 1072 | |
40b6229b | 1073 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1074 | return; |
1075 | ||
610f2de3 | 1076 | if (io->ctx.req) |
298a9fa0 | 1077 | crypt_free_req(cc, io->ctx.req, base_bio); |
b35f8caa | 1078 | |
cf2f1abf | 1079 | bio_endio(base_bio, error); |
1da177e4 LT |
1080 | } |
1081 | ||
1082 | /* | |
cabf08e4 | 1083 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1084 | * |
1085 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1086 | * interrupt context. |
cabf08e4 MB |
1087 | * |
1088 | * kcryptd performs the actual encryption or decryption. | |
1089 | * | |
1090 | * kcryptd_io performs the IO submission. | |
1091 | * | |
1092 | * They must be separated as otherwise the final stages could be | |
1093 | * starved by new requests which can block in the first stages due | |
1094 | * to memory allocation. | |
c0297721 AK |
1095 | * |
1096 | * The work is done per CPU global for all dm-crypt instances. | |
1097 | * They should not depend on each other and do not block. | |
1da177e4 | 1098 | */ |
6712ecf8 | 1099 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1100 | { |
028867ac | 1101 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1102 | struct crypt_config *cc = io->cc; |
ee7a491e | 1103 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1104 | |
adfe4770 MB |
1105 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1106 | error = -EIO; | |
1107 | ||
8b004457 | 1108 | /* |
6712ecf8 | 1109 | * free the processed pages |
8b004457 | 1110 | */ |
ee7a491e | 1111 | if (rw == WRITE) |
644bd2f0 | 1112 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1113 | |
1114 | bio_put(clone); | |
8b004457 | 1115 | |
ee7a491e MB |
1116 | if (rw == READ && !error) { |
1117 | kcryptd_queue_crypt(io); | |
1118 | return; | |
1119 | } | |
5742fd77 MB |
1120 | |
1121 | if (unlikely(error)) | |
1122 | io->error = error; | |
1123 | ||
1124 | crypt_dec_pending(io); | |
8b004457 MB |
1125 | } |
1126 | ||
028867ac | 1127 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1128 | { |
49a8a920 | 1129 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1130 | |
1131 | clone->bi_private = io; | |
1132 | clone->bi_end_io = crypt_endio; | |
1133 | clone->bi_bdev = cc->dev->bdev; | |
1134 | clone->bi_rw = io->base_bio->bi_rw; | |
1135 | } | |
1136 | ||
20c82538 | 1137 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1138 | { |
49a8a920 | 1139 | struct crypt_config *cc = io->cc; |
8b004457 | 1140 | struct bio *clone; |
93e605c2 | 1141 | |
8b004457 | 1142 | /* |
59779079 MS |
1143 | * We need the original biovec array in order to decrypt |
1144 | * the whole bio data *afterwards* -- thanks to immutable | |
1145 | * biovecs we don't need to worry about the block layer | |
1146 | * modifying the biovec array; so leverage bio_clone_fast(). | |
8b004457 | 1147 | */ |
59779079 | 1148 | clone = bio_clone_fast(io->base_bio, gfp, cc->bs); |
7eaceacc | 1149 | if (!clone) |
20c82538 | 1150 | return 1; |
8b004457 | 1151 | |
20c82538 MB |
1152 | crypt_inc_pending(io); |
1153 | ||
8b004457 | 1154 | clone_init(io, clone); |
4f024f37 | 1155 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1156 | |
93e605c2 | 1157 | generic_make_request(clone); |
20c82538 | 1158 | return 0; |
8b004457 MB |
1159 | } |
1160 | ||
dc267621 MP |
1161 | static void kcryptd_io_read_work(struct work_struct *work) |
1162 | { | |
1163 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1164 | ||
1165 | crypt_inc_pending(io); | |
1166 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1167 | io->error = -ENOMEM; | |
1168 | crypt_dec_pending(io); | |
1169 | } | |
1170 | ||
1171 | static void kcryptd_queue_read(struct dm_crypt_io *io) | |
1172 | { | |
1173 | struct crypt_config *cc = io->cc; | |
1174 | ||
1175 | INIT_WORK(&io->work, kcryptd_io_read_work); | |
1176 | queue_work(cc->io_queue, &io->work); | |
1177 | } | |
1178 | ||
4e4eef64 MB |
1179 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1180 | { | |
95497a96 | 1181 | struct bio *clone = io->ctx.bio_out; |
dc267621 | 1182 | |
95497a96 | 1183 | generic_make_request(clone); |
4e4eef64 MB |
1184 | } |
1185 | ||
b3c5fd30 MP |
1186 | #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) |
1187 | ||
dc267621 | 1188 | static int dmcrypt_write(void *data) |
395b167c | 1189 | { |
dc267621 | 1190 | struct crypt_config *cc = data; |
b3c5fd30 MP |
1191 | struct dm_crypt_io *io; |
1192 | ||
dc267621 | 1193 | while (1) { |
b3c5fd30 | 1194 | struct rb_root write_tree; |
dc267621 | 1195 | struct blk_plug plug; |
395b167c | 1196 | |
dc267621 | 1197 | DECLARE_WAITQUEUE(wait, current); |
395b167c | 1198 | |
dc267621 MP |
1199 | spin_lock_irq(&cc->write_thread_wait.lock); |
1200 | continue_locked: | |
395b167c | 1201 | |
b3c5fd30 | 1202 | if (!RB_EMPTY_ROOT(&cc->write_tree)) |
dc267621 MP |
1203 | goto pop_from_list; |
1204 | ||
1205 | __set_current_state(TASK_INTERRUPTIBLE); | |
1206 | __add_wait_queue(&cc->write_thread_wait, &wait); | |
1207 | ||
1208 | spin_unlock_irq(&cc->write_thread_wait.lock); | |
1209 | ||
1210 | if (unlikely(kthread_should_stop())) { | |
1211 | set_task_state(current, TASK_RUNNING); | |
1212 | remove_wait_queue(&cc->write_thread_wait, &wait); | |
1213 | break; | |
1214 | } | |
1215 | ||
1216 | schedule(); | |
1217 | ||
1218 | set_task_state(current, TASK_RUNNING); | |
1219 | spin_lock_irq(&cc->write_thread_wait.lock); | |
1220 | __remove_wait_queue(&cc->write_thread_wait, &wait); | |
1221 | goto continue_locked; | |
1222 | ||
1223 | pop_from_list: | |
b3c5fd30 MP |
1224 | write_tree = cc->write_tree; |
1225 | cc->write_tree = RB_ROOT; | |
dc267621 MP |
1226 | spin_unlock_irq(&cc->write_thread_wait.lock); |
1227 | ||
b3c5fd30 MP |
1228 | BUG_ON(rb_parent(write_tree.rb_node)); |
1229 | ||
1230 | /* | |
1231 | * Note: we cannot walk the tree here with rb_next because | |
1232 | * the structures may be freed when kcryptd_io_write is called. | |
1233 | */ | |
dc267621 MP |
1234 | blk_start_plug(&plug); |
1235 | do { | |
b3c5fd30 MP |
1236 | io = crypt_io_from_node(rb_first(&write_tree)); |
1237 | rb_erase(&io->rb_node, &write_tree); | |
dc267621 | 1238 | kcryptd_io_write(io); |
b3c5fd30 | 1239 | } while (!RB_EMPTY_ROOT(&write_tree)); |
dc267621 MP |
1240 | blk_finish_plug(&plug); |
1241 | } | |
1242 | return 0; | |
395b167c AK |
1243 | } |
1244 | ||
72c6e7af | 1245 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1246 | { |
dec1cedf | 1247 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1248 | struct crypt_config *cc = io->cc; |
dc267621 | 1249 | unsigned long flags; |
b3c5fd30 MP |
1250 | sector_t sector; |
1251 | struct rb_node **rbp, *parent; | |
dec1cedf | 1252 | |
72c6e7af | 1253 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1254 | crypt_free_buffer_pages(cc, clone); |
1255 | bio_put(clone); | |
6c031f41 | 1256 | crypt_dec_pending(io); |
dec1cedf MB |
1257 | return; |
1258 | } | |
1259 | ||
1260 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1261 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1262 | |
4f024f37 | 1263 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1264 | |
0f5d8e6e MP |
1265 | if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { |
1266 | generic_make_request(clone); | |
1267 | return; | |
1268 | } | |
1269 | ||
dc267621 | 1270 | spin_lock_irqsave(&cc->write_thread_wait.lock, flags); |
b3c5fd30 MP |
1271 | rbp = &cc->write_tree.rb_node; |
1272 | parent = NULL; | |
1273 | sector = io->sector; | |
1274 | while (*rbp) { | |
1275 | parent = *rbp; | |
1276 | if (sector < crypt_io_from_node(parent)->sector) | |
1277 | rbp = &(*rbp)->rb_left; | |
1278 | else | |
1279 | rbp = &(*rbp)->rb_right; | |
1280 | } | |
1281 | rb_link_node(&io->rb_node, parent, rbp); | |
1282 | rb_insert_color(&io->rb_node, &cc->write_tree); | |
1283 | ||
dc267621 MP |
1284 | wake_up_locked(&cc->write_thread_wait); |
1285 | spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); | |
4e4eef64 MB |
1286 | } |
1287 | ||
fc5a5e9a | 1288 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1289 | { |
49a8a920 | 1290 | struct crypt_config *cc = io->cc; |
8b004457 | 1291 | struct bio *clone; |
c8081618 | 1292 | int crypt_finished; |
b635b00e | 1293 | sector_t sector = io->sector; |
dec1cedf | 1294 | int r; |
8b004457 | 1295 | |
fc5a5e9a MB |
1296 | /* |
1297 | * Prevent io from disappearing until this function completes. | |
1298 | */ | |
1299 | crypt_inc_pending(io); | |
b635b00e | 1300 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1301 | |
cf2f1abf MP |
1302 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
1303 | if (unlikely(!clone)) { | |
1304 | io->error = -EIO; | |
1305 | goto dec; | |
1306 | } | |
c8081618 | 1307 | |
cf2f1abf MP |
1308 | io->ctx.bio_out = clone; |
1309 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 1310 | |
cf2f1abf | 1311 | sector += bio_sectors(clone); |
93e605c2 | 1312 | |
cf2f1abf MP |
1313 | crypt_inc_pending(io); |
1314 | r = crypt_convert(cc, &io->ctx); | |
1315 | if (r) | |
1316 | io->error = -EIO; | |
1317 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); | |
933f01d4 | 1318 | |
cf2f1abf MP |
1319 | /* Encryption was already finished, submit io now */ |
1320 | if (crypt_finished) { | |
1321 | kcryptd_crypt_write_io_submit(io, 0); | |
1322 | io->sector = sector; | |
93e605c2 | 1323 | } |
899c95d3 | 1324 | |
cf2f1abf | 1325 | dec: |
899c95d3 | 1326 | crypt_dec_pending(io); |
84131db6 MB |
1327 | } |
1328 | ||
72c6e7af | 1329 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1330 | { |
5742fd77 MB |
1331 | crypt_dec_pending(io); |
1332 | } | |
1333 | ||
4e4eef64 | 1334 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1335 | { |
49a8a920 | 1336 | struct crypt_config *cc = io->cc; |
5742fd77 | 1337 | int r = 0; |
1da177e4 | 1338 | |
3e1a8bdd | 1339 | crypt_inc_pending(io); |
3a7f6c99 | 1340 | |
53017030 | 1341 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1342 | io->sector); |
1da177e4 | 1343 | |
5742fd77 | 1344 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1345 | if (r < 0) |
1346 | io->error = -EIO; | |
5742fd77 | 1347 | |
40b6229b | 1348 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1349 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1350 | |
1351 | crypt_dec_pending(io); | |
1da177e4 LT |
1352 | } |
1353 | ||
95497a96 MB |
1354 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1355 | int error) | |
1356 | { | |
b2174eeb HY |
1357 | struct dm_crypt_request *dmreq = async_req->data; |
1358 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1359 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1360 | struct crypt_config *cc = io->cc; |
95497a96 | 1361 | |
54cea3f6 MB |
1362 | /* |
1363 | * A request from crypto driver backlog is going to be processed now, | |
1364 | * finish the completion and continue in crypt_convert(). | |
1365 | * (Callback will be called for the second time for this request.) | |
1366 | */ | |
c0403ec0 RV |
1367 | if (error == -EINPROGRESS) { |
1368 | complete(&ctx->restart); | |
95497a96 | 1369 | return; |
c0403ec0 | 1370 | } |
95497a96 | 1371 | |
2dc5327d MB |
1372 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1373 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1374 | ||
72c6e7af MP |
1375 | if (error < 0) |
1376 | io->error = -EIO; | |
1377 | ||
298a9fa0 | 1378 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1379 | |
40b6229b | 1380 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
c0403ec0 | 1381 | return; |
95497a96 MB |
1382 | |
1383 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1384 | kcryptd_crypt_read_done(io); |
95497a96 | 1385 | else |
72c6e7af | 1386 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1387 | } |
1388 | ||
395b167c | 1389 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1390 | { |
028867ac | 1391 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1392 | |
cabf08e4 | 1393 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1394 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1395 | else |
395b167c | 1396 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1397 | } |
1398 | ||
395b167c | 1399 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1400 | { |
49a8a920 | 1401 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1402 | |
395b167c AK |
1403 | INIT_WORK(&io->work, kcryptd_crypt); |
1404 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1405 | } |
1406 | ||
1407 | /* | |
1408 | * Decode key from its hex representation | |
1409 | */ | |
1410 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1411 | { | |
1412 | char buffer[3]; | |
1da177e4 LT |
1413 | unsigned int i; |
1414 | ||
1415 | buffer[2] = '\0'; | |
1416 | ||
8b004457 | 1417 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1418 | buffer[0] = *hex++; |
1419 | buffer[1] = *hex++; | |
1420 | ||
1a66a08a | 1421 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1422 | return -EINVAL; |
1423 | } | |
1424 | ||
1425 | if (*hex != '\0') | |
1426 | return -EINVAL; | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
fd2d231f | 1431 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1432 | { |
d1f96423 MB |
1433 | unsigned i; |
1434 | ||
fd2d231f MP |
1435 | if (!cc->tfms) |
1436 | return; | |
1437 | ||
d1f96423 | 1438 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1439 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1440 | crypto_free_ablkcipher(cc->tfms[i]); | |
1441 | cc->tfms[i] = NULL; | |
d1f96423 | 1442 | } |
fd2d231f MP |
1443 | |
1444 | kfree(cc->tfms); | |
1445 | cc->tfms = NULL; | |
d1f96423 MB |
1446 | } |
1447 | ||
fd2d231f | 1448 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1449 | { |
d1f96423 MB |
1450 | unsigned i; |
1451 | int err; | |
1452 | ||
fd2d231f MP |
1453 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1454 | GFP_KERNEL); | |
1455 | if (!cc->tfms) | |
1456 | return -ENOMEM; | |
1457 | ||
d1f96423 | 1458 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1459 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1460 | if (IS_ERR(cc->tfms[i])) { | |
1461 | err = PTR_ERR(cc->tfms[i]); | |
1462 | crypt_free_tfms(cc); | |
d1f96423 MB |
1463 | return err; |
1464 | } | |
1465 | } | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
c0297721 AK |
1470 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1471 | { | |
da31a078 | 1472 | unsigned subkey_size; |
fd2d231f MP |
1473 | int err = 0, i, r; |
1474 | ||
da31a078 MB |
1475 | /* Ignore extra keys (which are used for IV etc) */ |
1476 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1477 | ||
fd2d231f MP |
1478 | for (i = 0; i < cc->tfms_count; i++) { |
1479 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1480 | cc->key + (i * subkey_size), | |
1481 | subkey_size); | |
1482 | if (r) | |
1483 | err = r; | |
c0297721 AK |
1484 | } |
1485 | ||
1486 | return err; | |
1487 | } | |
1488 | ||
e48d4bbf MB |
1489 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1490 | { | |
de8be5ac MB |
1491 | int r = -EINVAL; |
1492 | int key_string_len = strlen(key); | |
1493 | ||
69a8cfcd | 1494 | /* The key size may not be changed. */ |
de8be5ac MB |
1495 | if (cc->key_size != (key_string_len >> 1)) |
1496 | goto out; | |
e48d4bbf | 1497 | |
69a8cfcd MB |
1498 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1499 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1500 | goto out; |
e48d4bbf | 1501 | |
69a8cfcd | 1502 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1503 | goto out; |
e48d4bbf MB |
1504 | |
1505 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1506 | ||
de8be5ac MB |
1507 | r = crypt_setkey_allcpus(cc); |
1508 | ||
1509 | out: | |
1510 | /* Hex key string not needed after here, so wipe it. */ | |
1511 | memset(key, '0', key_string_len); | |
1512 | ||
1513 | return r; | |
e48d4bbf MB |
1514 | } |
1515 | ||
1516 | static int crypt_wipe_key(struct crypt_config *cc) | |
1517 | { | |
1518 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1519 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1520 | |
1521 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1522 | } |
1523 | ||
28513fcc MB |
1524 | static void crypt_dtr(struct dm_target *ti) |
1525 | { | |
1526 | struct crypt_config *cc = ti->private; | |
1527 | ||
1528 | ti->private = NULL; | |
1529 | ||
1530 | if (!cc) | |
1531 | return; | |
1532 | ||
dc267621 MP |
1533 | if (cc->write_thread) |
1534 | kthread_stop(cc->write_thread); | |
1535 | ||
28513fcc MB |
1536 | if (cc->io_queue) |
1537 | destroy_workqueue(cc->io_queue); | |
1538 | if (cc->crypt_queue) | |
1539 | destroy_workqueue(cc->crypt_queue); | |
1540 | ||
fd2d231f MP |
1541 | crypt_free_tfms(cc); |
1542 | ||
28513fcc MB |
1543 | if (cc->bs) |
1544 | bioset_free(cc->bs); | |
1545 | ||
1546 | if (cc->page_pool) | |
1547 | mempool_destroy(cc->page_pool); | |
1548 | if (cc->req_pool) | |
1549 | mempool_destroy(cc->req_pool); | |
28513fcc MB |
1550 | |
1551 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1552 | cc->iv_gen_ops->dtr(cc); | |
1553 | ||
28513fcc MB |
1554 | if (cc->dev) |
1555 | dm_put_device(ti, cc->dev); | |
1556 | ||
5ebaee6d | 1557 | kzfree(cc->cipher); |
7dbcd137 | 1558 | kzfree(cc->cipher_string); |
28513fcc MB |
1559 | |
1560 | /* Must zero key material before freeing */ | |
1561 | kzfree(cc); | |
1562 | } | |
1563 | ||
5ebaee6d MB |
1564 | static int crypt_ctr_cipher(struct dm_target *ti, |
1565 | char *cipher_in, char *key) | |
1da177e4 | 1566 | { |
5ebaee6d | 1567 | struct crypt_config *cc = ti->private; |
d1f96423 | 1568 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1569 | char *cipher_api = NULL; |
fd2d231f | 1570 | int ret = -EINVAL; |
31998ef1 | 1571 | char dummy; |
1da177e4 | 1572 | |
5ebaee6d MB |
1573 | /* Convert to crypto api definition? */ |
1574 | if (strchr(cipher_in, '(')) { | |
1575 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1576 | return -EINVAL; |
1577 | } | |
1578 | ||
7dbcd137 MB |
1579 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1580 | if (!cc->cipher_string) | |
1581 | goto bad_mem; | |
1582 | ||
5ebaee6d MB |
1583 | /* |
1584 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1585 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1586 | */ |
1587 | tmp = cipher_in; | |
d1f96423 MB |
1588 | keycount = strsep(&tmp, "-"); |
1589 | cipher = strsep(&keycount, ":"); | |
1590 | ||
1591 | if (!keycount) | |
1592 | cc->tfms_count = 1; | |
31998ef1 | 1593 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1594 | !is_power_of_2(cc->tfms_count)) { |
1595 | ti->error = "Bad cipher key count specification"; | |
1596 | return -EINVAL; | |
1597 | } | |
1598 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1599 | cc->key_extra_size = 0; |
5ebaee6d MB |
1600 | |
1601 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1602 | if (!cc->cipher) | |
1603 | goto bad_mem; | |
1604 | ||
1da177e4 LT |
1605 | chainmode = strsep(&tmp, "-"); |
1606 | ivopts = strsep(&tmp, "-"); | |
1607 | ivmode = strsep(&ivopts, ":"); | |
1608 | ||
1609 | if (tmp) | |
5ebaee6d | 1610 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1611 | |
7dbcd137 MB |
1612 | /* |
1613 | * For compatibility with the original dm-crypt mapping format, if | |
1614 | * only the cipher name is supplied, use cbc-plain. | |
1615 | */ | |
5ebaee6d | 1616 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1617 | chainmode = "cbc"; |
1618 | ivmode = "plain"; | |
1619 | } | |
1620 | ||
d1806f6a | 1621 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1622 | ti->error = "IV mechanism required"; |
1623 | return -EINVAL; | |
1da177e4 LT |
1624 | } |
1625 | ||
5ebaee6d MB |
1626 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1627 | if (!cipher_api) | |
1628 | goto bad_mem; | |
1629 | ||
1630 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1631 | "%s(%s)", chainmode, cipher); | |
1632 | if (ret < 0) { | |
1633 | kfree(cipher_api); | |
1634 | goto bad_mem; | |
1da177e4 LT |
1635 | } |
1636 | ||
5ebaee6d | 1637 | /* Allocate cipher */ |
fd2d231f MP |
1638 | ret = crypt_alloc_tfms(cc, cipher_api); |
1639 | if (ret < 0) { | |
1640 | ti->error = "Error allocating crypto tfm"; | |
1641 | goto bad; | |
1da177e4 | 1642 | } |
1da177e4 | 1643 | |
5ebaee6d | 1644 | /* Initialize IV */ |
c0297721 | 1645 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1646 | if (cc->iv_size) |
1647 | /* at least a 64 bit sector number should fit in our buffer */ | |
1648 | cc->iv_size = max(cc->iv_size, | |
1649 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1650 | else if (ivmode) { | |
1651 | DMWARN("Selected cipher does not support IVs"); | |
1652 | ivmode = NULL; | |
1653 | } | |
1654 | ||
1655 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1656 | if (ivmode == NULL) |
1657 | cc->iv_gen_ops = NULL; | |
1658 | else if (strcmp(ivmode, "plain") == 0) | |
1659 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1660 | else if (strcmp(ivmode, "plain64") == 0) |
1661 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1662 | else if (strcmp(ivmode, "essiv") == 0) |
1663 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1664 | else if (strcmp(ivmode, "benbi") == 0) |
1665 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1666 | else if (strcmp(ivmode, "null") == 0) |
1667 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1668 | else if (strcmp(ivmode, "lmk") == 0) { |
1669 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1670 | /* |
1671 | * Version 2 and 3 is recognised according | |
34745785 MB |
1672 | * to length of provided multi-key string. |
1673 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1674 | * All keys (including IV seed) are always the same size. |
34745785 | 1675 | */ |
da31a078 | 1676 | if (cc->key_size % cc->key_parts) { |
34745785 | 1677 | cc->key_parts++; |
da31a078 MB |
1678 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1679 | } | |
ed04d981 MB |
1680 | } else if (strcmp(ivmode, "tcw") == 0) { |
1681 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1682 | cc->key_parts += 2; /* IV + whitening */ | |
1683 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1684 | } else { |
5ebaee6d | 1685 | ret = -EINVAL; |
72d94861 | 1686 | ti->error = "Invalid IV mode"; |
28513fcc | 1687 | goto bad; |
1da177e4 LT |
1688 | } |
1689 | ||
da31a078 MB |
1690 | /* Initialize and set key */ |
1691 | ret = crypt_set_key(cc, key); | |
1692 | if (ret < 0) { | |
1693 | ti->error = "Error decoding and setting key"; | |
1694 | goto bad; | |
1695 | } | |
1696 | ||
28513fcc MB |
1697 | /* Allocate IV */ |
1698 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1699 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1700 | if (ret < 0) { | |
1701 | ti->error = "Error creating IV"; | |
1702 | goto bad; | |
1703 | } | |
1704 | } | |
1da177e4 | 1705 | |
28513fcc MB |
1706 | /* Initialize IV (set keys for ESSIV etc) */ |
1707 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1708 | ret = cc->iv_gen_ops->init(cc); | |
1709 | if (ret < 0) { | |
1710 | ti->error = "Error initialising IV"; | |
1711 | goto bad; | |
1712 | } | |
b95bf2d3 MB |
1713 | } |
1714 | ||
5ebaee6d MB |
1715 | ret = 0; |
1716 | bad: | |
1717 | kfree(cipher_api); | |
1718 | return ret; | |
1719 | ||
1720 | bad_mem: | |
1721 | ti->error = "Cannot allocate cipher strings"; | |
1722 | return -ENOMEM; | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * Construct an encryption mapping: | |
1727 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1728 | */ | |
1729 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1730 | { | |
1731 | struct crypt_config *cc; | |
772ae5f5 | 1732 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1733 | unsigned long long tmpll; |
1734 | int ret; | |
d49ec52f | 1735 | size_t iv_size_padding; |
772ae5f5 MB |
1736 | struct dm_arg_set as; |
1737 | const char *opt_string; | |
31998ef1 | 1738 | char dummy; |
772ae5f5 MB |
1739 | |
1740 | static struct dm_arg _args[] = { | |
0f5d8e6e | 1741 | {0, 3, "Invalid number of feature args"}, |
772ae5f5 | 1742 | }; |
5ebaee6d | 1743 | |
772ae5f5 | 1744 | if (argc < 5) { |
5ebaee6d MB |
1745 | ti->error = "Not enough arguments"; |
1746 | return -EINVAL; | |
1da177e4 LT |
1747 | } |
1748 | ||
5ebaee6d MB |
1749 | key_size = strlen(argv[1]) >> 1; |
1750 | ||
1751 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1752 | if (!cc) { | |
1753 | ti->error = "Cannot allocate encryption context"; | |
1754 | return -ENOMEM; | |
1755 | } | |
69a8cfcd | 1756 | cc->key_size = key_size; |
5ebaee6d MB |
1757 | |
1758 | ti->private = cc; | |
1759 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1760 | if (ret < 0) | |
1761 | goto bad; | |
1762 | ||
ddd42edf | 1763 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1764 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
d49ec52f MP |
1765 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1766 | ||
1767 | if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { | |
1768 | /* Allocate the padding exactly */ | |
1769 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
1770 | & crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1771 | } else { | |
1772 | /* | |
1773 | * If the cipher requires greater alignment than kmalloc | |
1774 | * alignment, we don't know the exact position of the | |
1775 | * initialization vector. We must assume worst case. | |
1776 | */ | |
1777 | iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1778 | } | |
ddd42edf | 1779 | |
94f5e024 | 1780 | ret = -ENOMEM; |
ddd42edf | 1781 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
d49ec52f | 1782 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1783 | if (!cc->req_pool) { |
1784 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1785 | goto bad; |
ddd42edf | 1786 | } |
ddd42edf | 1787 | |
298a9fa0 | 1788 | cc->per_bio_data_size = ti->per_bio_data_size = |
d49ec52f MP |
1789 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1790 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1791 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1792 | |
cf2f1abf | 1793 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
1da177e4 | 1794 | if (!cc->page_pool) { |
72d94861 | 1795 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1796 | goto bad; |
1da177e4 LT |
1797 | } |
1798 | ||
bb799ca0 | 1799 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1800 | if (!cc->bs) { |
1801 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1802 | goto bad; |
6a24c718 MB |
1803 | } |
1804 | ||
7145c241 MP |
1805 | mutex_init(&cc->bio_alloc_lock); |
1806 | ||
28513fcc | 1807 | ret = -EINVAL; |
31998ef1 | 1808 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1809 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1810 | goto bad; |
1da177e4 | 1811 | } |
4ee218cd | 1812 | cc->iv_offset = tmpll; |
1da177e4 | 1813 | |
28513fcc MB |
1814 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1815 | ti->error = "Device lookup failed"; | |
1816 | goto bad; | |
1817 | } | |
1818 | ||
31998ef1 | 1819 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1820 | ti->error = "Invalid device sector"; |
28513fcc | 1821 | goto bad; |
1da177e4 | 1822 | } |
4ee218cd | 1823 | cc->start = tmpll; |
1da177e4 | 1824 | |
772ae5f5 MB |
1825 | argv += 5; |
1826 | argc -= 5; | |
1827 | ||
1828 | /* Optional parameters */ | |
1829 | if (argc) { | |
1830 | as.argc = argc; | |
1831 | as.argv = argv; | |
1832 | ||
1833 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1834 | if (ret) | |
1835 | goto bad; | |
1836 | ||
44c144f9 | 1837 | ret = -EINVAL; |
f3396c58 MP |
1838 | while (opt_params--) { |
1839 | opt_string = dm_shift_arg(&as); | |
1840 | if (!opt_string) { | |
1841 | ti->error = "Not enough feature arguments"; | |
1842 | goto bad; | |
1843 | } | |
772ae5f5 | 1844 | |
f3396c58 MP |
1845 | if (!strcasecmp(opt_string, "allow_discards")) |
1846 | ti->num_discard_bios = 1; | |
1847 | ||
1848 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
1849 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1850 | ||
0f5d8e6e MP |
1851 | else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) |
1852 | set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); | |
1853 | ||
f3396c58 MP |
1854 | else { |
1855 | ti->error = "Invalid feature arguments"; | |
1856 | goto bad; | |
1857 | } | |
772ae5f5 MB |
1858 | } |
1859 | } | |
1860 | ||
28513fcc | 1861 | ret = -ENOMEM; |
670368a8 | 1862 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1863 | if (!cc->io_queue) { |
1864 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1865 | goto bad; |
cabf08e4 MB |
1866 | } |
1867 | ||
f3396c58 MP |
1868 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
1869 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); | |
1870 | else | |
1871 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1872 | num_online_cpus()); | |
cabf08e4 | 1873 | if (!cc->crypt_queue) { |
9934a8be | 1874 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1875 | goto bad; |
9934a8be MB |
1876 | } |
1877 | ||
dc267621 | 1878 | init_waitqueue_head(&cc->write_thread_wait); |
b3c5fd30 | 1879 | cc->write_tree = RB_ROOT; |
dc267621 MP |
1880 | |
1881 | cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); | |
1882 | if (IS_ERR(cc->write_thread)) { | |
1883 | ret = PTR_ERR(cc->write_thread); | |
1884 | cc->write_thread = NULL; | |
1885 | ti->error = "Couldn't spawn write thread"; | |
1886 | goto bad; | |
1887 | } | |
1888 | wake_up_process(cc->write_thread); | |
1889 | ||
55a62eef | 1890 | ti->num_flush_bios = 1; |
0ac55489 | 1891 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1892 | |
1da177e4 LT |
1893 | return 0; |
1894 | ||
28513fcc MB |
1895 | bad: |
1896 | crypt_dtr(ti); | |
1897 | return ret; | |
1da177e4 LT |
1898 | } |
1899 | ||
7de3ee57 | 1900 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1901 | { |
028867ac | 1902 | struct dm_crypt_io *io; |
49a8a920 | 1903 | struct crypt_config *cc = ti->private; |
647c7db1 | 1904 | |
772ae5f5 MB |
1905 | /* |
1906 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1907 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1908 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1909 | */ | |
1910 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1911 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1912 | if (bio_sectors(bio)) |
4f024f37 KO |
1913 | bio->bi_iter.bi_sector = cc->start + |
1914 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1915 | return DM_MAPIO_REMAPPED; |
1916 | } | |
1da177e4 | 1917 | |
298a9fa0 MP |
1918 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
1919 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
1920 | io->ctx.req = (struct ablkcipher_request *)(io + 1); | |
cabf08e4 | 1921 | |
20c82538 MB |
1922 | if (bio_data_dir(io->base_bio) == READ) { |
1923 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
dc267621 | 1924 | kcryptd_queue_read(io); |
20c82538 | 1925 | } else |
cabf08e4 | 1926 | kcryptd_queue_crypt(io); |
1da177e4 | 1927 | |
d2a7ad29 | 1928 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1929 | } |
1930 | ||
fd7c092e MP |
1931 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1932 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1933 | { |
5ebaee6d | 1934 | struct crypt_config *cc = ti->private; |
fd7c092e | 1935 | unsigned i, sz = 0; |
f3396c58 | 1936 | int num_feature_args = 0; |
1da177e4 LT |
1937 | |
1938 | switch (type) { | |
1939 | case STATUSTYPE_INFO: | |
1940 | result[0] = '\0'; | |
1941 | break; | |
1942 | ||
1943 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1944 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1945 | |
fd7c092e MP |
1946 | if (cc->key_size > 0) |
1947 | for (i = 0; i < cc->key_size; i++) | |
1948 | DMEMIT("%02x", cc->key[i]); | |
1949 | else | |
1950 | DMEMIT("-"); | |
1da177e4 | 1951 | |
4ee218cd AM |
1952 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1953 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1954 | |
f3396c58 MP |
1955 | num_feature_args += !!ti->num_discard_bios; |
1956 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
0f5d8e6e | 1957 | num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); |
f3396c58 MP |
1958 | if (num_feature_args) { |
1959 | DMEMIT(" %d", num_feature_args); | |
1960 | if (ti->num_discard_bios) | |
1961 | DMEMIT(" allow_discards"); | |
1962 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) | |
1963 | DMEMIT(" same_cpu_crypt"); | |
0f5d8e6e MP |
1964 | if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) |
1965 | DMEMIT(" submit_from_crypt_cpus"); | |
f3396c58 | 1966 | } |
772ae5f5 | 1967 | |
1da177e4 LT |
1968 | break; |
1969 | } | |
1da177e4 LT |
1970 | } |
1971 | ||
e48d4bbf MB |
1972 | static void crypt_postsuspend(struct dm_target *ti) |
1973 | { | |
1974 | struct crypt_config *cc = ti->private; | |
1975 | ||
1976 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1977 | } | |
1978 | ||
1979 | static int crypt_preresume(struct dm_target *ti) | |
1980 | { | |
1981 | struct crypt_config *cc = ti->private; | |
1982 | ||
1983 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1984 | DMERR("aborting resume - crypt key is not set."); | |
1985 | return -EAGAIN; | |
1986 | } | |
1987 | ||
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | static void crypt_resume(struct dm_target *ti) | |
1992 | { | |
1993 | struct crypt_config *cc = ti->private; | |
1994 | ||
1995 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1996 | } | |
1997 | ||
1998 | /* Message interface | |
1999 | * key set <key> | |
2000 | * key wipe | |
2001 | */ | |
2002 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
2003 | { | |
2004 | struct crypt_config *cc = ti->private; | |
542da317 | 2005 | int ret = -EINVAL; |
e48d4bbf MB |
2006 | |
2007 | if (argc < 2) | |
2008 | goto error; | |
2009 | ||
498f0103 | 2010 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
2011 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
2012 | DMWARN("not suspended during key manipulation."); | |
2013 | return -EINVAL; | |
2014 | } | |
498f0103 | 2015 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
2016 | ret = crypt_set_key(cc, argv[2]); |
2017 | if (ret) | |
2018 | return ret; | |
2019 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
2020 | ret = cc->iv_gen_ops->init(cc); | |
2021 | return ret; | |
2022 | } | |
498f0103 | 2023 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
2024 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
2025 | ret = cc->iv_gen_ops->wipe(cc); | |
2026 | if (ret) | |
2027 | return ret; | |
2028 | } | |
e48d4bbf | 2029 | return crypt_wipe_key(cc); |
542da317 | 2030 | } |
e48d4bbf MB |
2031 | } |
2032 | ||
2033 | error: | |
2034 | DMWARN("unrecognised message received."); | |
2035 | return -EINVAL; | |
2036 | } | |
2037 | ||
d41e26b9 MB |
2038 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
2039 | struct bio_vec *biovec, int max_size) | |
2040 | { | |
2041 | struct crypt_config *cc = ti->private; | |
2042 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
2043 | ||
2044 | if (!q->merge_bvec_fn) | |
2045 | return max_size; | |
2046 | ||
2047 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 2048 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
2049 | |
2050 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
2051 | } | |
2052 | ||
af4874e0 MS |
2053 | static int crypt_iterate_devices(struct dm_target *ti, |
2054 | iterate_devices_callout_fn fn, void *data) | |
2055 | { | |
2056 | struct crypt_config *cc = ti->private; | |
2057 | ||
5dea271b | 2058 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
2059 | } |
2060 | ||
1da177e4 LT |
2061 | static struct target_type crypt_target = { |
2062 | .name = "crypt", | |
f3396c58 | 2063 | .version = {1, 14, 0}, |
1da177e4 LT |
2064 | .module = THIS_MODULE, |
2065 | .ctr = crypt_ctr, | |
2066 | .dtr = crypt_dtr, | |
2067 | .map = crypt_map, | |
2068 | .status = crypt_status, | |
e48d4bbf MB |
2069 | .postsuspend = crypt_postsuspend, |
2070 | .preresume = crypt_preresume, | |
2071 | .resume = crypt_resume, | |
2072 | .message = crypt_message, | |
d41e26b9 | 2073 | .merge = crypt_merge, |
af4874e0 | 2074 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
2075 | }; |
2076 | ||
2077 | static int __init dm_crypt_init(void) | |
2078 | { | |
2079 | int r; | |
2080 | ||
1da177e4 | 2081 | r = dm_register_target(&crypt_target); |
94f5e024 | 2082 | if (r < 0) |
72d94861 | 2083 | DMERR("register failed %d", r); |
1da177e4 | 2084 | |
1da177e4 LT |
2085 | return r; |
2086 | } | |
2087 | ||
2088 | static void __exit dm_crypt_exit(void) | |
2089 | { | |
10d3bd09 | 2090 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
2091 | } |
2092 | ||
2093 | module_init(dm_crypt_init); | |
2094 | module_exit(dm_crypt_exit); | |
2095 | ||
bf14299f | 2096 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
2097 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
2098 | MODULE_LICENSE("GPL"); |