Commit | Line | Data |
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3bd94003 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
bf14299f | 3 | * Copyright (C) 2003 Jana Saout <jana@saout.de> |
1da177e4 | 4 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
bbb16584 MB |
5 | * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved. |
6 | * Copyright (C) 2013-2020 Milan Broz <gmazyland@gmail.com> | |
1da177e4 LT |
7 | * |
8 | * This file is released under the GPL. | |
9 | */ | |
10 | ||
43d69034 | 11 | #include <linux/completion.h> |
d1806f6a | 12 | #include <linux/err.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
c538f6ec | 16 | #include <linux/key.h> |
1da177e4 LT |
17 | #include <linux/bio.h> |
18 | #include <linux/blkdev.h> | |
fe45e630 | 19 | #include <linux/blk-integrity.h> |
1da177e4 LT |
20 | #include <linux/mempool.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/crypto.h> | |
23 | #include <linux/workqueue.h> | |
dc267621 | 24 | #include <linux/kthread.h> |
3fcfab16 | 25 | #include <linux/backing-dev.h> |
60063497 | 26 | #include <linux/atomic.h> |
378f058c | 27 | #include <linux/scatterlist.h> |
b3c5fd30 | 28 | #include <linux/rbtree.h> |
027c431c | 29 | #include <linux/ctype.h> |
1da177e4 | 30 | #include <asm/page.h> |
48527fa7 | 31 | #include <asm/unaligned.h> |
34745785 MB |
32 | #include <crypto/hash.h> |
33 | #include <crypto/md5.h> | |
bbdb23b5 | 34 | #include <crypto/skcipher.h> |
ef43aa38 MB |
35 | #include <crypto/aead.h> |
36 | #include <crypto/authenc.h> | |
e3023094 | 37 | #include <crypto/utils.h> |
ef43aa38 | 38 | #include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ |
27f5411a | 39 | #include <linux/key-type.h> |
c538f6ec | 40 | #include <keys/user-type.h> |
27f5411a | 41 | #include <keys/encrypted-type.h> |
363880c4 | 42 | #include <keys/trusted-type.h> |
1da177e4 | 43 | |
586e80e6 | 44 | #include <linux/device-mapper.h> |
1da177e4 | 45 | |
58d0f180 MW |
46 | #include "dm-audit.h" |
47 | ||
72d94861 | 48 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 49 | |
1da177e4 LT |
50 | /* |
51 | * context holding the current state of a multi-part conversion | |
52 | */ | |
53 | struct convert_context { | |
43d69034 | 54 | struct completion restart; |
1da177e4 | 55 | struct bio *bio_in; |
003b5c57 | 56 | struct bvec_iter iter_in; |
787f1b28 | 57 | struct bio *bio_out; |
003b5c57 | 58 | struct bvec_iter iter_out; |
40b6229b | 59 | atomic_t cc_pending; |
787f1b28 | 60 | u64 cc_sector; |
ef43aa38 MB |
61 | union { |
62 | struct skcipher_request *req; | |
63 | struct aead_request *req_aead; | |
64 | } r; | |
42e15d12 MP |
65 | bool aead_recheck; |
66 | bool aead_failed; | |
ef43aa38 | 67 | |
1da177e4 LT |
68 | }; |
69 | ||
53017030 MB |
70 | /* |
71 | * per bio private data | |
72 | */ | |
73 | struct dm_crypt_io { | |
49a8a920 | 74 | struct crypt_config *cc; |
53017030 | 75 | struct bio *base_bio; |
ef43aa38 | 76 | u8 *integrity_metadata; |
d9a02e01 | 77 | bool integrity_metadata_from_pool:1; |
d9a02e01 | 78 | |
53017030 MB |
79 | struct work_struct work; |
80 | ||
81 | struct convert_context ctx; | |
82 | ||
40b6229b | 83 | atomic_t io_pending; |
4e4cbee9 | 84 | blk_status_t error; |
0c395b0f | 85 | sector_t sector; |
dc267621 | 86 | |
42e15d12 MP |
87 | struct bvec_iter saved_bi_iter; |
88 | ||
b3c5fd30 | 89 | struct rb_node rb_node; |
298a9fa0 | 90 | } CRYPTO_MINALIGN_ATTR; |
53017030 | 91 | |
01482b76 | 92 | struct dm_crypt_request { |
b2174eeb | 93 | struct convert_context *ctx; |
ef43aa38 MB |
94 | struct scatterlist sg_in[4]; |
95 | struct scatterlist sg_out[4]; | |
8d683dcd | 96 | u64 iv_sector; |
01482b76 MB |
97 | }; |
98 | ||
1da177e4 LT |
99 | struct crypt_config; |
100 | ||
101 | struct crypt_iv_operations { | |
102 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 103 | const char *opts); |
1da177e4 | 104 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 105 | int (*init)(struct crypt_config *cc); |
542da317 | 106 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
107 | int (*generator)(struct crypt_config *cc, u8 *iv, |
108 | struct dm_crypt_request *dmreq); | |
109 | int (*post)(struct crypt_config *cc, u8 *iv, | |
110 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
111 | }; |
112 | ||
60473592 MB |
113 | struct iv_benbi_private { |
114 | int shift; | |
115 | }; | |
116 | ||
34745785 MB |
117 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
118 | struct iv_lmk_private { | |
119 | struct crypto_shash *hash_tfm; | |
120 | u8 *seed; | |
121 | }; | |
122 | ||
ed04d981 MB |
123 | #define TCW_WHITENING_SIZE 16 |
124 | struct iv_tcw_private { | |
125 | struct crypto_shash *crc32_tfm; | |
126 | u8 *iv_seed; | |
127 | u8 *whitening; | |
128 | }; | |
129 | ||
bbb16584 MB |
130 | #define ELEPHANT_MAX_KEY_SIZE 32 |
131 | struct iv_elephant_private { | |
132 | struct crypto_skcipher *tfm; | |
133 | }; | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Crypt: maps a linear range of a block device | |
137 | * and encrypts / decrypts at the same time. | |
138 | */ | |
0f5d8e6e | 139 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, |
39d42fa9 | 140 | DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD, |
8e225f04 DLM |
141 | DM_CRYPT_NO_READ_WORKQUEUE, DM_CRYPT_NO_WRITE_WORKQUEUE, |
142 | DM_CRYPT_WRITE_INLINE }; | |
c0297721 | 143 | |
ef43aa38 | 144 | enum cipher_flags { |
74d1da39 | 145 | CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ |
8f0009a2 | 146 | CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ |
bbb16584 | 147 | CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ |
ef43aa38 MB |
148 | }; |
149 | ||
c0297721 | 150 | /* |
610f2de3 | 151 | * The fields in here must be read only after initialization. |
c0297721 | 152 | */ |
1da177e4 LT |
153 | struct crypt_config { |
154 | struct dm_dev *dev; | |
155 | sector_t start; | |
156 | ||
5059353d MP |
157 | struct percpu_counter n_allocated_pages; |
158 | ||
cabf08e4 MB |
159 | struct workqueue_struct *io_queue; |
160 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 161 | |
c7329eff | 162 | spinlock_t write_thread_lock; |
72d711c8 | 163 | struct task_struct *write_thread; |
b3c5fd30 | 164 | struct rb_root write_tree; |
dc267621 | 165 | |
7dbcd137 | 166 | char *cipher_string; |
ef43aa38 | 167 | char *cipher_auth; |
c538f6ec | 168 | char *key_string; |
5ebaee6d | 169 | |
1b1b58f5 | 170 | const struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 171 | union { |
60473592 | 172 | struct iv_benbi_private benbi; |
34745785 | 173 | struct iv_lmk_private lmk; |
ed04d981 | 174 | struct iv_tcw_private tcw; |
bbb16584 | 175 | struct iv_elephant_private elephant; |
79066ad3 | 176 | } iv_gen_private; |
8d683dcd | 177 | u64 iv_offset; |
1da177e4 | 178 | unsigned int iv_size; |
86a3238c | 179 | unsigned short sector_size; |
ff3af92b | 180 | unsigned char sector_shift; |
1da177e4 | 181 | |
ef43aa38 MB |
182 | union { |
183 | struct crypto_skcipher **tfms; | |
184 | struct crypto_aead **tfms_aead; | |
185 | } cipher_tfm; | |
86a3238c | 186 | unsigned int tfms_count; |
ef43aa38 | 187 | unsigned long cipher_flags; |
c0297721 | 188 | |
ddd42edf MB |
189 | /* |
190 | * Layout of each crypto request: | |
191 | * | |
bbdb23b5 | 192 | * struct skcipher_request |
ddd42edf MB |
193 | * context |
194 | * padding | |
195 | * struct dm_crypt_request | |
196 | * padding | |
197 | * IV | |
198 | * | |
199 | * The padding is added so that dm_crypt_request and the IV are | |
200 | * correctly aligned. | |
201 | */ | |
202 | unsigned int dmreq_start; | |
ddd42edf | 203 | |
298a9fa0 MP |
204 | unsigned int per_bio_data_size; |
205 | ||
e48d4bbf | 206 | unsigned long flags; |
1da177e4 | 207 | unsigned int key_size; |
da31a078 MB |
208 | unsigned int key_parts; /* independent parts in key buffer */ |
209 | unsigned int key_extra_size; /* additional keys length */ | |
ef43aa38 MB |
210 | unsigned int key_mac_size; /* MAC key size for authenc(...) */ |
211 | ||
212 | unsigned int integrity_tag_size; | |
213 | unsigned int integrity_iv_size; | |
214 | unsigned int on_disk_tag_size; | |
215 | ||
72d711c8 MS |
216 | /* |
217 | * pool for per bio private data, crypto requests, | |
218 | * encryption requeusts/buffer pages and integrity tags | |
219 | */ | |
86a3238c | 220 | unsigned int tag_pool_max_sectors; |
72d711c8 MS |
221 | mempool_t tag_pool; |
222 | mempool_t req_pool; | |
223 | mempool_t page_pool; | |
224 | ||
225 | struct bio_set bs; | |
226 | struct mutex bio_alloc_lock; | |
227 | ||
ef43aa38 | 228 | u8 *authenc_key; /* space for keys in authenc() format (if used) */ |
6521ba56 | 229 | u8 key[] __counted_by(key_size); |
1da177e4 LT |
230 | }; |
231 | ||
ef43aa38 MB |
232 | #define MIN_IOS 64 |
233 | #define MAX_TAG_SIZE 480 | |
234 | #define POOL_ENTRY_SIZE 512 | |
1da177e4 | 235 | |
5059353d | 236 | static DEFINE_SPINLOCK(dm_crypt_clients_lock); |
2f06cd12 | 237 | static unsigned int dm_crypt_clients_n; |
5059353d MP |
238 | static volatile unsigned long dm_crypt_pages_per_client; |
239 | #define DM_CRYPT_MEMORY_PERCENT 2 | |
a8affc03 | 240 | #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_VECS * 16) |
5059353d | 241 | |
3f868c09 | 242 | static void crypt_endio(struct bio *clone); |
395b167c | 243 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
ef43aa38 MB |
244 | static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, |
245 | struct scatterlist *sg); | |
027581f3 | 246 | |
3fd53533 YY |
247 | static bool crypt_integrity_aead(struct crypt_config *cc); |
248 | ||
c0297721 | 249 | /* |
86f917ad | 250 | * Use this to access cipher attributes that are independent of the key. |
c0297721 | 251 | */ |
bbdb23b5 | 252 | static struct crypto_skcipher *any_tfm(struct crypt_config *cc) |
c0297721 | 253 | { |
ef43aa38 MB |
254 | return cc->cipher_tfm.tfms[0]; |
255 | } | |
256 | ||
257 | static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) | |
258 | { | |
259 | return cc->cipher_tfm.tfms_aead[0]; | |
c0297721 AK |
260 | } |
261 | ||
1da177e4 LT |
262 | /* |
263 | * Different IV generation algorithms: | |
264 | * | |
3c164bd8 | 265 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 266 | * number, padded with zeros if necessary. |
1da177e4 | 267 | * |
61afef61 MB |
268 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
269 | * number, padded with zeros if necessary. | |
270 | * | |
7e3fd855 MB |
271 | * plain64be: the initial vector is the 64-bit big-endian version of the sector |
272 | * number, padded with zeros if necessary. | |
273 | * | |
3c164bd8 RS |
274 | * essiv: "encrypted sector|salt initial vector", the sector number is |
275 | * encrypted with the bulk cipher using a salt as key. The salt | |
276 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 277 | * |
48527fa7 RS |
278 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
279 | * (needed for LRW-32-AES and possible other narrow block modes) | |
280 | * | |
46b47730 LN |
281 | * null: the initial vector is always zero. Provides compatibility with |
282 | * obsolete loop_fish2 devices. Do not use for new devices. | |
283 | * | |
34745785 MB |
284 | * lmk: Compatible implementation of the block chaining mode used |
285 | * by the Loop-AES block device encryption system | |
286 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
287 | * It operates on full 512 byte sectors and uses CBC | |
288 | * with an IV derived from the sector number, the data and | |
289 | * optionally extra IV seed. | |
290 | * This means that after decryption the first block | |
291 | * of sector must be tweaked according to decrypted data. | |
292 | * Loop-AES can use three encryption schemes: | |
293 | * version 1: is plain aes-cbc mode | |
294 | * version 2: uses 64 multikey scheme with lmk IV generator | |
295 | * version 3: the same as version 2 with additional IV seed | |
296 | * (it uses 65 keys, last key is used as IV seed) | |
297 | * | |
ed04d981 MB |
298 | * tcw: Compatible implementation of the block chaining mode used |
299 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
e44f23b3 | 300 | * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat |
ed04d981 MB |
301 | * It operates on full 512 byte sectors and uses CBC |
302 | * with an IV derived from initial key and the sector number. | |
303 | * In addition, whitening value is applied on every sector, whitening | |
304 | * is calculated from initial key, sector number and mixed using CRC32. | |
305 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
306 | * and should be used for old compatible containers access only. | |
b9411d73 MB |
307 | * |
308 | * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) | |
309 | * The IV is encrypted little-endian byte-offset (with the same key | |
310 | * and cipher as the volume). | |
bbb16584 MB |
311 | * |
312 | * elephant: The extended version of eboiv with additional Elephant diffuser | |
313 | * used with Bitlocker CBC mode. | |
314 | * This mode was used in older Windows systems | |
6f3bc22b | 315 | * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf |
1da177e4 LT |
316 | */ |
317 | ||
2dc5327d MB |
318 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
319 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
320 | { |
321 | memset(iv, 0, cc->iv_size); | |
283a8328 | 322 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
323 | |
324 | return 0; | |
325 | } | |
326 | ||
61afef61 | 327 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 328 | struct dm_crypt_request *dmreq) |
61afef61 MB |
329 | { |
330 | memset(iv, 0, cc->iv_size); | |
283a8328 | 331 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
7e3fd855 MB |
336 | static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, |
337 | struct dm_crypt_request *dmreq) | |
338 | { | |
339 | memset(iv, 0, cc->iv_size); | |
340 | /* iv_size is at least of size u64; usually it is 16 bytes */ | |
341 | *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
2dc5327d MB |
346 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
347 | struct dm_crypt_request *dmreq) | |
1da177e4 | 348 | { |
a1a262b6 AB |
349 | /* |
350 | * ESSIV encryption of the IV is now handled by the crypto API, | |
351 | * so just pass the plain sector number here. | |
352 | */ | |
1da177e4 | 353 | memset(iv, 0, cc->iv_size); |
283a8328 | 354 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 | 355 | |
1da177e4 LT |
356 | return 0; |
357 | } | |
358 | ||
48527fa7 RS |
359 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
360 | const char *opts) | |
361 | { | |
86a3238c | 362 | unsigned int bs; |
4ea9471f MB |
363 | int log; |
364 | ||
3fd53533 | 365 | if (crypt_integrity_aead(cc)) |
4ea9471f MB |
366 | bs = crypto_aead_blocksize(any_tfm_aead(cc)); |
367 | else | |
368 | bs = crypto_skcipher_blocksize(any_tfm(cc)); | |
369 | log = ilog2(bs); | |
48527fa7 | 370 | |
a4a82ce3 HM |
371 | /* |
372 | * We need to calculate how far we must shift the sector count | |
373 | * to get the cipher block count, we use this shift in _gen. | |
374 | */ | |
48527fa7 RS |
375 | if (1 << log != bs) { |
376 | ti->error = "cypher blocksize is not a power of 2"; | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | if (log > 9) { | |
381 | ti->error = "cypher blocksize is > 512"; | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
60473592 | 385 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
386 | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
391 | { | |
48527fa7 RS |
392 | } |
393 | ||
2dc5327d MB |
394 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
395 | struct dm_crypt_request *dmreq) | |
48527fa7 | 396 | { |
79066ad3 HX |
397 | __be64 val; |
398 | ||
48527fa7 | 399 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 400 | |
2dc5327d | 401 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 402 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 403 | |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
2dc5327d MB |
407 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
408 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
409 | { |
410 | memset(iv, 0, cc->iv_size); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
34745785 MB |
415 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
416 | { | |
417 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
418 | ||
419 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
420 | crypto_free_shash(lmk->hash_tfm); | |
421 | lmk->hash_tfm = NULL; | |
422 | ||
453431a5 | 423 | kfree_sensitive(lmk->seed); |
34745785 MB |
424 | lmk->seed = NULL; |
425 | } | |
426 | ||
427 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
428 | const char *opts) | |
429 | { | |
430 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
431 | ||
8f0009a2 MB |
432 | if (cc->sector_size != (1 << SECTOR_SHIFT)) { |
433 | ti->error = "Unsupported sector size for LMK"; | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
cd746938 MP |
437 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, |
438 | CRYPTO_ALG_ALLOCATES_MEMORY); | |
34745785 MB |
439 | if (IS_ERR(lmk->hash_tfm)) { |
440 | ti->error = "Error initializing LMK hash"; | |
441 | return PTR_ERR(lmk->hash_tfm); | |
442 | } | |
443 | ||
444 | /* No seed in LMK version 2 */ | |
445 | if (cc->key_parts == cc->tfms_count) { | |
446 | lmk->seed = NULL; | |
447 | return 0; | |
448 | } | |
449 | ||
450 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
451 | if (!lmk->seed) { | |
452 | crypt_iv_lmk_dtr(cc); | |
453 | ti->error = "Error kmallocing seed storage in LMK"; | |
454 | return -ENOMEM; | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
461 | { | |
462 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
463 | int subkey_size = cc->key_size / cc->key_parts; | |
464 | ||
465 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
466 | if (lmk->seed) | |
467 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
468 | crypto_shash_digestsize(lmk->hash_tfm)); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
474 | { | |
475 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
476 | ||
477 | if (lmk->seed) | |
478 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
484 | struct dm_crypt_request *dmreq, | |
485 | u8 *data) | |
486 | { | |
487 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 488 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 489 | struct md5_state md5state; |
da31a078 | 490 | __le32 buf[4]; |
34745785 MB |
491 | int i, r; |
492 | ||
b6106265 | 493 | desc->tfm = lmk->hash_tfm; |
34745785 | 494 | |
b6106265 | 495 | r = crypto_shash_init(desc); |
34745785 MB |
496 | if (r) |
497 | return r; | |
498 | ||
499 | if (lmk->seed) { | |
b6106265 | 500 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
501 | if (r) |
502 | return r; | |
503 | } | |
504 | ||
505 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 506 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
507 | if (r) |
508 | return r; | |
509 | ||
510 | /* Sector is cropped to 56 bits here */ | |
511 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
512 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
513 | buf[2] = cpu_to_le32(4024); | |
514 | buf[3] = 0; | |
b6106265 | 515 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
516 | if (r) |
517 | return r; | |
518 | ||
519 | /* No MD5 padding here */ | |
b6106265 | 520 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
521 | if (r) |
522 | return r; | |
523 | ||
524 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
525 | __cpu_to_le32s(&md5state.hash[i]); | |
526 | memcpy(iv, &md5state.hash, cc->iv_size); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
532 | struct dm_crypt_request *dmreq) | |
533 | { | |
ef43aa38 | 534 | struct scatterlist *sg; |
34745785 MB |
535 | u8 *src; |
536 | int r = 0; | |
537 | ||
538 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
ef43aa38 | 539 | sg = crypt_get_sg_data(cc, dmreq->sg_in); |
0d78954a | 540 | src = kmap_local_page(sg_page(sg)); |
ef43aa38 | 541 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); |
0d78954a | 542 | kunmap_local(src); |
34745785 MB |
543 | } else |
544 | memset(iv, 0, cc->iv_size); | |
545 | ||
546 | return r; | |
547 | } | |
548 | ||
549 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
550 | struct dm_crypt_request *dmreq) | |
551 | { | |
ef43aa38 | 552 | struct scatterlist *sg; |
34745785 MB |
553 | u8 *dst; |
554 | int r; | |
555 | ||
556 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
557 | return 0; | |
558 | ||
ef43aa38 | 559 | sg = crypt_get_sg_data(cc, dmreq->sg_out); |
0d78954a | 560 | dst = kmap_local_page(sg_page(sg)); |
ef43aa38 | 561 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); |
34745785 MB |
562 | |
563 | /* Tweak the first block of plaintext sector */ | |
564 | if (!r) | |
ef43aa38 | 565 | crypto_xor(dst + sg->offset, iv, cc->iv_size); |
34745785 | 566 | |
0d78954a | 567 | kunmap_local(dst); |
34745785 MB |
568 | return r; |
569 | } | |
570 | ||
ed04d981 MB |
571 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
572 | { | |
573 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
574 | ||
453431a5 | 575 | kfree_sensitive(tcw->iv_seed); |
ed04d981 | 576 | tcw->iv_seed = NULL; |
453431a5 | 577 | kfree_sensitive(tcw->whitening); |
ed04d981 MB |
578 | tcw->whitening = NULL; |
579 | ||
580 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
581 | crypto_free_shash(tcw->crc32_tfm); | |
582 | tcw->crc32_tfm = NULL; | |
583 | } | |
584 | ||
585 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
586 | const char *opts) | |
587 | { | |
588 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
589 | ||
8f0009a2 MB |
590 | if (cc->sector_size != (1 << SECTOR_SHIFT)) { |
591 | ti->error = "Unsupported sector size for TCW"; | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
ed04d981 MB |
595 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { |
596 | ti->error = "Wrong key size for TCW"; | |
597 | return -EINVAL; | |
598 | } | |
599 | ||
cd746938 MP |
600 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, |
601 | CRYPTO_ALG_ALLOCATES_MEMORY); | |
ed04d981 MB |
602 | if (IS_ERR(tcw->crc32_tfm)) { |
603 | ti->error = "Error initializing CRC32 in TCW"; | |
604 | return PTR_ERR(tcw->crc32_tfm); | |
605 | } | |
606 | ||
607 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
608 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
609 | if (!tcw->iv_seed || !tcw->whitening) { | |
610 | crypt_iv_tcw_dtr(cc); | |
611 | ti->error = "Error allocating seed storage in TCW"; | |
612 | return -ENOMEM; | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
619 | { | |
620 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
621 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
622 | ||
623 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
624 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
625 | TCW_WHITENING_SIZE); | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
631 | { | |
632 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
633 | ||
634 | memset(tcw->iv_seed, 0, cc->iv_size); | |
635 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
641 | struct dm_crypt_request *dmreq, | |
642 | u8 *data) | |
643 | { | |
644 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
350b5393 | 645 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 | 646 | u8 buf[TCW_WHITENING_SIZE]; |
b6106265 | 647 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
648 | int i, r; |
649 | ||
650 | /* xor whitening with sector number */ | |
45fe93df AB |
651 | crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); |
652 | crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); | |
ed04d981 MB |
653 | |
654 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 | 655 | desc->tfm = tcw->crc32_tfm; |
ed04d981 | 656 | for (i = 0; i < 4; i++) { |
6d0ee3b6 | 657 | r = crypto_shash_digest(desc, &buf[i * 4], 4, &buf[i * 4]); |
ed04d981 MB |
658 | if (r) |
659 | goto out; | |
660 | } | |
661 | crypto_xor(&buf[0], &buf[12], 4); | |
662 | crypto_xor(&buf[4], &buf[8], 4); | |
663 | ||
664 | /* apply whitening (8 bytes) to whole sector */ | |
665 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
666 | crypto_xor(data + i * 8, buf, 8); | |
667 | out: | |
1a71d6ff | 668 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
669 | return r; |
670 | } | |
671 | ||
672 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
673 | struct dm_crypt_request *dmreq) | |
674 | { | |
ef43aa38 | 675 | struct scatterlist *sg; |
ed04d981 | 676 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
350b5393 | 677 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
ed04d981 MB |
678 | u8 *src; |
679 | int r = 0; | |
680 | ||
681 | /* Remove whitening from ciphertext */ | |
682 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
ef43aa38 | 683 | sg = crypt_get_sg_data(cc, dmreq->sg_in); |
0d78954a | 684 | src = kmap_local_page(sg_page(sg)); |
ef43aa38 | 685 | r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); |
0d78954a | 686 | kunmap_local(src); |
ed04d981 MB |
687 | } |
688 | ||
689 | /* Calculate IV */ | |
45fe93df | 690 | crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); |
ed04d981 | 691 | if (cc->iv_size > 8) |
45fe93df AB |
692 | crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, |
693 | cc->iv_size - 8); | |
ed04d981 MB |
694 | |
695 | return r; | |
696 | } | |
697 | ||
698 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
699 | struct dm_crypt_request *dmreq) | |
700 | { | |
ef43aa38 | 701 | struct scatterlist *sg; |
ed04d981 MB |
702 | u8 *dst; |
703 | int r; | |
704 | ||
705 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
706 | return 0; | |
707 | ||
708 | /* Apply whitening on ciphertext */ | |
ef43aa38 | 709 | sg = crypt_get_sg_data(cc, dmreq->sg_out); |
0d78954a | 710 | dst = kmap_local_page(sg_page(sg)); |
ef43aa38 | 711 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); |
0d78954a | 712 | kunmap_local(dst); |
ed04d981 MB |
713 | |
714 | return r; | |
715 | } | |
716 | ||
ef43aa38 MB |
717 | static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, |
718 | struct dm_crypt_request *dmreq) | |
719 | { | |
720 | /* Used only for writes, there must be an additional space to store IV */ | |
721 | get_random_bytes(iv, cc->iv_size); | |
722 | return 0; | |
723 | } | |
724 | ||
b9411d73 MB |
725 | static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
726 | const char *opts) | |
727 | { | |
3fd53533 | 728 | if (crypt_integrity_aead(cc)) { |
39d13a1a AB |
729 | ti->error = "AEAD transforms not supported for EBOIV"; |
730 | return -EINVAL; | |
b9411d73 MB |
731 | } |
732 | ||
39d13a1a | 733 | if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { |
2e84fecf | 734 | ti->error = "Block size of EBOIV cipher does not match IV size of block cipher"; |
b9411d73 MB |
735 | return -EINVAL; |
736 | } | |
737 | ||
b9411d73 MB |
738 | return 0; |
739 | } | |
740 | ||
39d13a1a AB |
741 | static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, |
742 | struct dm_crypt_request *dmreq) | |
b9411d73 | 743 | { |
e3023094 | 744 | struct crypto_skcipher *tfm = any_tfm(cc); |
39d13a1a AB |
745 | struct skcipher_request *req; |
746 | struct scatterlist src, dst; | |
7785a9e4 | 747 | DECLARE_CRYPTO_WAIT(wait); |
e3023094 | 748 | unsigned int reqsize; |
b9411d73 | 749 | int err; |
e3023094 | 750 | u8 *buf; |
b9411d73 | 751 | |
152d0bcd HX |
752 | reqsize = sizeof(*req) + crypto_skcipher_reqsize(tfm); |
753 | reqsize = ALIGN(reqsize, __alignof__(__le64)); | |
e3023094 HX |
754 | |
755 | req = kmalloc(reqsize + cc->iv_size, GFP_NOIO); | |
39d13a1a AB |
756 | if (!req) |
757 | return -ENOMEM; | |
b9411d73 | 758 | |
e3023094 HX |
759 | skcipher_request_set_tfm(req, tfm); |
760 | ||
761 | buf = (u8 *)req + reqsize; | |
39d13a1a AB |
762 | memset(buf, 0, cc->iv_size); |
763 | *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); | |
b9411d73 | 764 | |
39d13a1a AB |
765 | sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); |
766 | sg_init_one(&dst, iv, cc->iv_size); | |
767 | skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); | |
768 | skcipher_request_set_callback(req, 0, crypto_req_done, &wait); | |
769 | err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); | |
e3023094 | 770 | kfree_sensitive(req); |
b9411d73 | 771 | |
39d13a1a | 772 | return err; |
b9411d73 MB |
773 | } |
774 | ||
bbb16584 MB |
775 | static void crypt_iv_elephant_dtr(struct crypt_config *cc) |
776 | { | |
777 | struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; | |
778 | ||
779 | crypto_free_skcipher(elephant->tfm); | |
780 | elephant->tfm = NULL; | |
781 | } | |
782 | ||
783 | static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, | |
784 | const char *opts) | |
785 | { | |
786 | struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; | |
787 | int r; | |
788 | ||
cd746938 MP |
789 | elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, |
790 | CRYPTO_ALG_ALLOCATES_MEMORY); | |
bbb16584 MB |
791 | if (IS_ERR(elephant->tfm)) { |
792 | r = PTR_ERR(elephant->tfm); | |
793 | elephant->tfm = NULL; | |
794 | return r; | |
795 | } | |
796 | ||
797 | r = crypt_iv_eboiv_ctr(cc, ti, NULL); | |
798 | if (r) | |
799 | crypt_iv_elephant_dtr(cc); | |
800 | return r; | |
801 | } | |
802 | ||
803 | static void diffuser_disk_to_cpu(u32 *d, size_t n) | |
804 | { | |
805 | #ifndef __LITTLE_ENDIAN | |
806 | int i; | |
807 | ||
808 | for (i = 0; i < n; i++) | |
809 | d[i] = le32_to_cpu((__le32)d[i]); | |
810 | #endif | |
811 | } | |
812 | ||
813 | static void diffuser_cpu_to_disk(__le32 *d, size_t n) | |
814 | { | |
815 | #ifndef __LITTLE_ENDIAN | |
816 | int i; | |
817 | ||
818 | for (i = 0; i < n; i++) | |
819 | d[i] = cpu_to_le32((u32)d[i]); | |
820 | #endif | |
821 | } | |
822 | ||
823 | static void diffuser_a_decrypt(u32 *d, size_t n) | |
824 | { | |
825 | int i, i1, i2, i3; | |
826 | ||
827 | for (i = 0; i < 5; i++) { | |
828 | i1 = 0; | |
829 | i2 = n - 2; | |
830 | i3 = n - 5; | |
831 | ||
832 | while (i1 < (n - 1)) { | |
833 | d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); | |
834 | i1++; i2++; i3++; | |
835 | ||
836 | if (i3 >= n) | |
837 | i3 -= n; | |
838 | ||
839 | d[i1] += d[i2] ^ d[i3]; | |
840 | i1++; i2++; i3++; | |
841 | ||
842 | if (i2 >= n) | |
843 | i2 -= n; | |
844 | ||
845 | d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); | |
846 | i1++; i2++; i3++; | |
847 | ||
848 | d[i1] += d[i2] ^ d[i3]; | |
849 | i1++; i2++; i3++; | |
850 | } | |
851 | } | |
852 | } | |
853 | ||
854 | static void diffuser_a_encrypt(u32 *d, size_t n) | |
855 | { | |
856 | int i, i1, i2, i3; | |
857 | ||
858 | for (i = 0; i < 5; i++) { | |
859 | i1 = n - 1; | |
860 | i2 = n - 2 - 1; | |
861 | i3 = n - 5 - 1; | |
862 | ||
863 | while (i1 > 0) { | |
864 | d[i1] -= d[i2] ^ d[i3]; | |
865 | i1--; i2--; i3--; | |
866 | ||
867 | d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); | |
868 | i1--; i2--; i3--; | |
869 | ||
870 | if (i2 < 0) | |
871 | i2 += n; | |
872 | ||
873 | d[i1] -= d[i2] ^ d[i3]; | |
874 | i1--; i2--; i3--; | |
875 | ||
876 | if (i3 < 0) | |
877 | i3 += n; | |
878 | ||
879 | d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); | |
880 | i1--; i2--; i3--; | |
881 | } | |
882 | } | |
883 | } | |
884 | ||
885 | static void diffuser_b_decrypt(u32 *d, size_t n) | |
886 | { | |
887 | int i, i1, i2, i3; | |
888 | ||
889 | for (i = 0; i < 3; i++) { | |
890 | i1 = 0; | |
891 | i2 = 2; | |
892 | i3 = 5; | |
893 | ||
894 | while (i1 < (n - 1)) { | |
895 | d[i1] += d[i2] ^ d[i3]; | |
896 | i1++; i2++; i3++; | |
897 | ||
898 | d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); | |
899 | i1++; i2++; i3++; | |
900 | ||
901 | if (i2 >= n) | |
902 | i2 -= n; | |
903 | ||
904 | d[i1] += d[i2] ^ d[i3]; | |
905 | i1++; i2++; i3++; | |
906 | ||
907 | if (i3 >= n) | |
908 | i3 -= n; | |
909 | ||
910 | d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); | |
911 | i1++; i2++; i3++; | |
912 | } | |
913 | } | |
914 | } | |
915 | ||
916 | static void diffuser_b_encrypt(u32 *d, size_t n) | |
917 | { | |
918 | int i, i1, i2, i3; | |
919 | ||
920 | for (i = 0; i < 3; i++) { | |
921 | i1 = n - 1; | |
922 | i2 = 2 - 1; | |
923 | i3 = 5 - 1; | |
924 | ||
925 | while (i1 > 0) { | |
926 | d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); | |
927 | i1--; i2--; i3--; | |
928 | ||
929 | if (i3 < 0) | |
930 | i3 += n; | |
931 | ||
932 | d[i1] -= d[i2] ^ d[i3]; | |
933 | i1--; i2--; i3--; | |
934 | ||
935 | if (i2 < 0) | |
936 | i2 += n; | |
937 | ||
938 | d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); | |
939 | i1--; i2--; i3--; | |
940 | ||
941 | d[i1] -= d[i2] ^ d[i3]; | |
942 | i1--; i2--; i3--; | |
943 | } | |
944 | } | |
945 | } | |
946 | ||
947 | static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq) | |
948 | { | |
949 | struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; | |
950 | u8 *es, *ks, *data, *data2, *data_offset; | |
951 | struct skcipher_request *req; | |
952 | struct scatterlist *sg, *sg2, src, dst; | |
7785a9e4 | 953 | DECLARE_CRYPTO_WAIT(wait); |
bbb16584 MB |
954 | int i, r; |
955 | ||
956 | req = skcipher_request_alloc(elephant->tfm, GFP_NOIO); | |
957 | es = kzalloc(16, GFP_NOIO); /* Key for AES */ | |
958 | ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */ | |
959 | ||
960 | if (!req || !es || !ks) { | |
961 | r = -ENOMEM; | |
962 | goto out; | |
963 | } | |
964 | ||
965 | *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size); | |
966 | ||
967 | /* E(Ks, e(s)) */ | |
968 | sg_init_one(&src, es, 16); | |
969 | sg_init_one(&dst, ks, 16); | |
970 | skcipher_request_set_crypt(req, &src, &dst, 16, NULL); | |
971 | skcipher_request_set_callback(req, 0, crypto_req_done, &wait); | |
972 | r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); | |
973 | if (r) | |
974 | goto out; | |
975 | ||
976 | /* E(Ks, e'(s)) */ | |
977 | es[15] = 0x80; | |
978 | sg_init_one(&dst, &ks[16], 16); | |
979 | r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); | |
980 | if (r) | |
981 | goto out; | |
982 | ||
983 | sg = crypt_get_sg_data(cc, dmreq->sg_out); | |
0d78954a | 984 | data = kmap_local_page(sg_page(sg)); |
bbb16584 MB |
985 | data_offset = data + sg->offset; |
986 | ||
987 | /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ | |
988 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
989 | sg2 = crypt_get_sg_data(cc, dmreq->sg_in); | |
0d78954a | 990 | data2 = kmap_local_page(sg_page(sg2)); |
bbb16584 | 991 | memcpy(data_offset, data2 + sg2->offset, cc->sector_size); |
0d78954a | 992 | kunmap_local(data2); |
bbb16584 MB |
993 | } |
994 | ||
995 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
ced6e475 HM |
996 | diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); |
997 | diffuser_b_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); | |
998 | diffuser_a_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); | |
999 | diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); | |
bbb16584 MB |
1000 | } |
1001 | ||
1002 | for (i = 0; i < (cc->sector_size / 32); i++) | |
1003 | crypto_xor(data_offset + i * 32, ks, 32); | |
1004 | ||
1005 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
ced6e475 HM |
1006 | diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32)); |
1007 | diffuser_a_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); | |
1008 | diffuser_b_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32)); | |
1009 | diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32)); | |
bbb16584 MB |
1010 | } |
1011 | ||
0d78954a | 1012 | kunmap_local(data); |
bbb16584 | 1013 | out: |
453431a5 WL |
1014 | kfree_sensitive(ks); |
1015 | kfree_sensitive(es); | |
bbb16584 MB |
1016 | skcipher_request_free(req); |
1017 | return r; | |
1018 | } | |
1019 | ||
1020 | static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, | |
1021 | struct dm_crypt_request *dmreq) | |
1022 | { | |
1023 | int r; | |
1024 | ||
1025 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
1026 | r = crypt_iv_elephant(cc, dmreq); | |
1027 | if (r) | |
1028 | return r; | |
1029 | } | |
1030 | ||
1031 | return crypt_iv_eboiv_gen(cc, iv, dmreq); | |
1032 | } | |
1033 | ||
1034 | static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, | |
1035 | struct dm_crypt_request *dmreq) | |
1036 | { | |
1037 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
1038 | return crypt_iv_elephant(cc, dmreq); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static int crypt_iv_elephant_init(struct crypt_config *cc) | |
1044 | { | |
1045 | struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; | |
1046 | int key_offset = cc->key_size - cc->key_extra_size; | |
1047 | ||
1048 | return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size); | |
1049 | } | |
1050 | ||
1051 | static int crypt_iv_elephant_wipe(struct crypt_config *cc) | |
1052 | { | |
1053 | struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; | |
1054 | u8 key[ELEPHANT_MAX_KEY_SIZE]; | |
1055 | ||
1056 | memset(key, 0, cc->key_extra_size); | |
1057 | return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size); | |
1058 | } | |
1059 | ||
1b1b58f5 | 1060 | static const struct crypt_iv_operations crypt_iv_plain_ops = { |
1da177e4 LT |
1061 | .generator = crypt_iv_plain_gen |
1062 | }; | |
1063 | ||
1b1b58f5 | 1064 | static const struct crypt_iv_operations crypt_iv_plain64_ops = { |
61afef61 MB |
1065 | .generator = crypt_iv_plain64_gen |
1066 | }; | |
1067 | ||
7e3fd855 MB |
1068 | static const struct crypt_iv_operations crypt_iv_plain64be_ops = { |
1069 | .generator = crypt_iv_plain64be_gen | |
1070 | }; | |
1071 | ||
1b1b58f5 | 1072 | static const struct crypt_iv_operations crypt_iv_essiv_ops = { |
1da177e4 LT |
1073 | .generator = crypt_iv_essiv_gen |
1074 | }; | |
1075 | ||
1b1b58f5 | 1076 | static const struct crypt_iv_operations crypt_iv_benbi_ops = { |
48527fa7 RS |
1077 | .ctr = crypt_iv_benbi_ctr, |
1078 | .dtr = crypt_iv_benbi_dtr, | |
1079 | .generator = crypt_iv_benbi_gen | |
1080 | }; | |
1da177e4 | 1081 | |
1b1b58f5 | 1082 | static const struct crypt_iv_operations crypt_iv_null_ops = { |
46b47730 LN |
1083 | .generator = crypt_iv_null_gen |
1084 | }; | |
1085 | ||
1b1b58f5 | 1086 | static const struct crypt_iv_operations crypt_iv_lmk_ops = { |
34745785 MB |
1087 | .ctr = crypt_iv_lmk_ctr, |
1088 | .dtr = crypt_iv_lmk_dtr, | |
1089 | .init = crypt_iv_lmk_init, | |
1090 | .wipe = crypt_iv_lmk_wipe, | |
1091 | .generator = crypt_iv_lmk_gen, | |
1092 | .post = crypt_iv_lmk_post | |
1093 | }; | |
1094 | ||
1b1b58f5 | 1095 | static const struct crypt_iv_operations crypt_iv_tcw_ops = { |
ed04d981 MB |
1096 | .ctr = crypt_iv_tcw_ctr, |
1097 | .dtr = crypt_iv_tcw_dtr, | |
1098 | .init = crypt_iv_tcw_init, | |
1099 | .wipe = crypt_iv_tcw_wipe, | |
1100 | .generator = crypt_iv_tcw_gen, | |
1101 | .post = crypt_iv_tcw_post | |
1102 | }; | |
1103 | ||
e8dc79d1 | 1104 | static const struct crypt_iv_operations crypt_iv_random_ops = { |
ef43aa38 MB |
1105 | .generator = crypt_iv_random_gen |
1106 | }; | |
1107 | ||
e8dc79d1 | 1108 | static const struct crypt_iv_operations crypt_iv_eboiv_ops = { |
b9411d73 | 1109 | .ctr = crypt_iv_eboiv_ctr, |
b9411d73 MB |
1110 | .generator = crypt_iv_eboiv_gen |
1111 | }; | |
1112 | ||
e8dc79d1 | 1113 | static const struct crypt_iv_operations crypt_iv_elephant_ops = { |
bbb16584 MB |
1114 | .ctr = crypt_iv_elephant_ctr, |
1115 | .dtr = crypt_iv_elephant_dtr, | |
1116 | .init = crypt_iv_elephant_init, | |
1117 | .wipe = crypt_iv_elephant_wipe, | |
1118 | .generator = crypt_iv_elephant_gen, | |
1119 | .post = crypt_iv_elephant_post | |
1120 | }; | |
1121 | ||
ef43aa38 MB |
1122 | /* |
1123 | * Integrity extensions | |
1124 | */ | |
1125 | static bool crypt_integrity_aead(struct crypt_config *cc) | |
1126 | { | |
1127 | return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); | |
1128 | } | |
1129 | ||
1130 | static bool crypt_integrity_hmac(struct crypt_config *cc) | |
1131 | { | |
33d2f09f | 1132 | return crypt_integrity_aead(cc) && cc->key_mac_size; |
ef43aa38 MB |
1133 | } |
1134 | ||
1135 | /* Get sg containing data */ | |
1136 | static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, | |
1137 | struct scatterlist *sg) | |
1138 | { | |
33d2f09f | 1139 | if (unlikely(crypt_integrity_aead(cc))) |
ef43aa38 MB |
1140 | return &sg[2]; |
1141 | ||
1142 | return sg; | |
1143 | } | |
1144 | ||
1145 | static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) | |
1146 | { | |
1147 | struct bio_integrity_payload *bip; | |
1148 | unsigned int tag_len; | |
1149 | int ret; | |
1150 | ||
1151 | if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) | |
1152 | return 0; | |
1153 | ||
1154 | bip = bio_integrity_alloc(bio, GFP_NOIO, 1); | |
1155 | if (IS_ERR(bip)) | |
1156 | return PTR_ERR(bip); | |
1157 | ||
ff0c129d | 1158 | tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); |
ef43aa38 | 1159 | |
ef43aa38 MB |
1160 | bip->bip_iter.bi_sector = io->cc->start + io->sector; |
1161 | ||
ef43aa38 MB |
1162 | ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), |
1163 | tag_len, offset_in_page(io->integrity_metadata)); | |
1164 | if (unlikely(ret != tag_len)) | |
1165 | return -ENOMEM; | |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) | |
1171 | { | |
1172 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
1173 | struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); | |
7a1cd723 | 1174 | struct mapped_device *md = dm_table_get_md(ti->table); |
ef43aa38 MB |
1175 | |
1176 | /* From now we require underlying device with our integrity profile */ | |
1177 | if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { | |
1178 | ti->error = "Integrity profile not supported."; | |
1179 | return -EINVAL; | |
1180 | } | |
1181 | ||
583fe747 MP |
1182 | if (bi->tag_size != cc->on_disk_tag_size || |
1183 | bi->tuple_size != cc->on_disk_tag_size) { | |
ef43aa38 MB |
1184 | ti->error = "Integrity profile tag size mismatch."; |
1185 | return -EINVAL; | |
1186 | } | |
583fe747 MP |
1187 | if (1 << bi->interval_exp != cc->sector_size) { |
1188 | ti->error = "Integrity profile sector size mismatch."; | |
1189 | return -EINVAL; | |
1190 | } | |
ef43aa38 | 1191 | |
33d2f09f | 1192 | if (crypt_integrity_aead(cc)) { |
ef43aa38 | 1193 | cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; |
7a1cd723 | 1194 | DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), |
ef43aa38 MB |
1195 | cc->integrity_tag_size, cc->integrity_iv_size); |
1196 | ||
1197 | if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { | |
1198 | ti->error = "Integrity AEAD auth tag size is not supported."; | |
1199 | return -EINVAL; | |
1200 | } | |
1201 | } else if (cc->integrity_iv_size) | |
7a1cd723 | 1202 | DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), |
ef43aa38 MB |
1203 | cc->integrity_iv_size); |
1204 | ||
1205 | if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { | |
1206 | ti->error = "Not enough space for integrity tag in the profile."; | |
1207 | return -EINVAL; | |
1208 | } | |
1209 | ||
1210 | return 0; | |
1211 | #else | |
1212 | ti->error = "Integrity profile not supported."; | |
1213 | return -EINVAL; | |
1214 | #endif | |
1215 | } | |
1216 | ||
d469f841 MB |
1217 | static void crypt_convert_init(struct crypt_config *cc, |
1218 | struct convert_context *ctx, | |
1219 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 1220 | sector_t sector) |
1da177e4 LT |
1221 | { |
1222 | ctx->bio_in = bio_in; | |
1223 | ctx->bio_out = bio_out; | |
003b5c57 KO |
1224 | if (bio_in) |
1225 | ctx->iter_in = bio_in->bi_iter; | |
1226 | if (bio_out) | |
1227 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 1228 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 1229 | init_completion(&ctx->restart); |
1da177e4 LT |
1230 | } |
1231 | ||
b2174eeb | 1232 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
ef43aa38 | 1233 | void *req) |
b2174eeb HY |
1234 | { |
1235 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
1236 | } | |
1237 | ||
ef43aa38 | 1238 | static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) |
b2174eeb | 1239 | { |
ef43aa38 | 1240 | return (void *)((char *)dmreq - cc->dmreq_start); |
b2174eeb HY |
1241 | } |
1242 | ||
2dc5327d MB |
1243 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
1244 | struct dm_crypt_request *dmreq) | |
1245 | { | |
33d2f09f | 1246 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
1247 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), |
1248 | crypto_aead_alignmask(any_tfm_aead(cc)) + 1); | |
1249 | else | |
1250 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
1251 | crypto_skcipher_alignmask(any_tfm(cc)) + 1); | |
2dc5327d MB |
1252 | } |
1253 | ||
ef43aa38 MB |
1254 | static u8 *org_iv_of_dmreq(struct crypt_config *cc, |
1255 | struct dm_crypt_request *dmreq) | |
1256 | { | |
1257 | return iv_of_dmreq(cc, dmreq) + cc->iv_size; | |
1258 | } | |
1259 | ||
c13b5487 | 1260 | static __le64 *org_sector_of_dmreq(struct crypt_config *cc, |
ef43aa38 MB |
1261 | struct dm_crypt_request *dmreq) |
1262 | { | |
1263 | u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; | |
0ef0b471 | 1264 | |
c13b5487 | 1265 | return (__le64 *) ptr; |
ef43aa38 MB |
1266 | } |
1267 | ||
1268 | static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, | |
1269 | struct dm_crypt_request *dmreq) | |
1270 | { | |
1271 | u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + | |
1272 | cc->iv_size + sizeof(uint64_t); | |
0ef0b471 | 1273 | |
ced6e475 | 1274 | return (unsigned int *)ptr; |
ef43aa38 MB |
1275 | } |
1276 | ||
1277 | static void *tag_from_dmreq(struct crypt_config *cc, | |
1278 | struct dm_crypt_request *dmreq) | |
1279 | { | |
1280 | struct convert_context *ctx = dmreq->ctx; | |
1281 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); | |
1282 | ||
1283 | return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * | |
1284 | cc->on_disk_tag_size]; | |
1285 | } | |
1286 | ||
1287 | static void *iv_tag_from_dmreq(struct crypt_config *cc, | |
1288 | struct dm_crypt_request *dmreq) | |
1289 | { | |
1290 | return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; | |
1291 | } | |
1292 | ||
1293 | static int crypt_convert_block_aead(struct crypt_config *cc, | |
1294 | struct convert_context *ctx, | |
1295 | struct aead_request *req, | |
1296 | unsigned int tag_offset) | |
01482b76 | 1297 | { |
003b5c57 KO |
1298 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
1299 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 | 1300 | struct dm_crypt_request *dmreq; |
ef43aa38 | 1301 | u8 *iv, *org_iv, *tag_iv, *tag; |
c13b5487 | 1302 | __le64 *sector; |
ef43aa38 MB |
1303 | int r = 0; |
1304 | ||
1305 | BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); | |
3a7f6c99 | 1306 | |
8f0009a2 | 1307 | /* Reject unexpected unaligned bio. */ |
0440d5c0 | 1308 | if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) |
8f0009a2 | 1309 | return -EIO; |
3a7f6c99 | 1310 | |
b2174eeb | 1311 | dmreq = dmreq_of_req(cc, req); |
ef43aa38 | 1312 | dmreq->iv_sector = ctx->cc_sector; |
8f0009a2 | 1313 | if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) |
ff3af92b | 1314 | dmreq->iv_sector >>= cc->sector_shift; |
ef43aa38 MB |
1315 | dmreq->ctx = ctx; |
1316 | ||
1317 | *org_tag_of_dmreq(cc, dmreq) = tag_offset; | |
1318 | ||
1319 | sector = org_sector_of_dmreq(cc, dmreq); | |
1320 | *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); | |
1321 | ||
2dc5327d | 1322 | iv = iv_of_dmreq(cc, dmreq); |
ef43aa38 MB |
1323 | org_iv = org_iv_of_dmreq(cc, dmreq); |
1324 | tag = tag_from_dmreq(cc, dmreq); | |
1325 | tag_iv = iv_tag_from_dmreq(cc, dmreq); | |
1326 | ||
1327 | /* AEAD request: | |
1328 | * |----- AAD -------|------ DATA -------|-- AUTH TAG --| | |
1329 | * | (authenticated) | (auth+encryption) | | | |
1330 | * | sector_LE | IV | sector in/out | tag in/out | | |
1331 | */ | |
1332 | sg_init_table(dmreq->sg_in, 4); | |
1333 | sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); | |
1334 | sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); | |
8f0009a2 | 1335 | sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); |
ef43aa38 MB |
1336 | sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); |
1337 | ||
1338 | sg_init_table(dmreq->sg_out, 4); | |
1339 | sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); | |
1340 | sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); | |
8f0009a2 | 1341 | sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); |
ef43aa38 MB |
1342 | sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); |
1343 | ||
1344 | if (cc->iv_gen_ops) { | |
1345 | /* For READs use IV stored in integrity metadata */ | |
1346 | if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { | |
1347 | memcpy(org_iv, tag_iv, cc->iv_size); | |
1348 | } else { | |
1349 | r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); | |
1350 | if (r < 0) | |
1351 | return r; | |
1352 | /* Store generated IV in integrity metadata */ | |
1353 | if (cc->integrity_iv_size) | |
1354 | memcpy(tag_iv, org_iv, cc->iv_size); | |
1355 | } | |
1356 | /* Working copy of IV, to be modified in crypto API */ | |
1357 | memcpy(iv, org_iv, cc->iv_size); | |
1358 | } | |
1359 | ||
1360 | aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); | |
1361 | if (bio_data_dir(ctx->bio_in) == WRITE) { | |
1362 | aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, | |
8f0009a2 | 1363 | cc->sector_size, iv); |
ef43aa38 MB |
1364 | r = crypto_aead_encrypt(req); |
1365 | if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) | |
1366 | memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, | |
1367 | cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); | |
1368 | } else { | |
1369 | aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, | |
8f0009a2 | 1370 | cc->sector_size + cc->integrity_tag_size, iv); |
ef43aa38 MB |
1371 | r = crypto_aead_decrypt(req); |
1372 | } | |
1373 | ||
f710126c | 1374 | if (r == -EBADMSG) { |
58d0f180 MW |
1375 | sector_t s = le64_to_cpu(*sector); |
1376 | ||
42e15d12 MP |
1377 | ctx->aead_failed = true; |
1378 | if (ctx->aead_recheck) { | |
1379 | DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", | |
1380 | ctx->bio_in->bi_bdev, s); | |
1381 | dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", | |
1382 | ctx->bio_in, s, 0); | |
1383 | } | |
f710126c | 1384 | } |
ef43aa38 MB |
1385 | |
1386 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) | |
1387 | r = cc->iv_gen_ops->post(cc, org_iv, dmreq); | |
1388 | ||
8f0009a2 MB |
1389 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); |
1390 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); | |
01482b76 | 1391 | |
ef43aa38 MB |
1392 | return r; |
1393 | } | |
1394 | ||
1395 | static int crypt_convert_block_skcipher(struct crypt_config *cc, | |
1396 | struct convert_context *ctx, | |
1397 | struct skcipher_request *req, | |
1398 | unsigned int tag_offset) | |
1399 | { | |
1400 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); | |
1401 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
1402 | struct scatterlist *sg_in, *sg_out; | |
1403 | struct dm_crypt_request *dmreq; | |
ef43aa38 | 1404 | u8 *iv, *org_iv, *tag_iv; |
c13b5487 | 1405 | __le64 *sector; |
ef43aa38 | 1406 | int r = 0; |
01482b76 | 1407 | |
8f0009a2 | 1408 | /* Reject unexpected unaligned bio. */ |
0440d5c0 | 1409 | if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) |
8f0009a2 MB |
1410 | return -EIO; |
1411 | ||
ef43aa38 | 1412 | dmreq = dmreq_of_req(cc, req); |
c66029f4 | 1413 | dmreq->iv_sector = ctx->cc_sector; |
8f0009a2 | 1414 | if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) |
ff3af92b | 1415 | dmreq->iv_sector >>= cc->sector_shift; |
b2174eeb | 1416 | dmreq->ctx = ctx; |
01482b76 | 1417 | |
ef43aa38 MB |
1418 | *org_tag_of_dmreq(cc, dmreq) = tag_offset; |
1419 | ||
1420 | iv = iv_of_dmreq(cc, dmreq); | |
1421 | org_iv = org_iv_of_dmreq(cc, dmreq); | |
1422 | tag_iv = iv_tag_from_dmreq(cc, dmreq); | |
1423 | ||
1424 | sector = org_sector_of_dmreq(cc, dmreq); | |
1425 | *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); | |
1426 | ||
1427 | /* For skcipher we use only the first sg item */ | |
1428 | sg_in = &dmreq->sg_in[0]; | |
1429 | sg_out = &dmreq->sg_out[0]; | |
01482b76 | 1430 | |
ef43aa38 | 1431 | sg_init_table(sg_in, 1); |
8f0009a2 | 1432 | sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); |
ef43aa38 MB |
1433 | |
1434 | sg_init_table(sg_out, 1); | |
8f0009a2 | 1435 | sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); |
01482b76 | 1436 | |
3a7f6c99 | 1437 | if (cc->iv_gen_ops) { |
ef43aa38 MB |
1438 | /* For READs use IV stored in integrity metadata */ |
1439 | if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { | |
1440 | memcpy(org_iv, tag_iv, cc->integrity_iv_size); | |
1441 | } else { | |
1442 | r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); | |
1443 | if (r < 0) | |
1444 | return r; | |
bbb16584 MB |
1445 | /* Data can be already preprocessed in generator */ |
1446 | if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) | |
1447 | sg_in = sg_out; | |
ef43aa38 MB |
1448 | /* Store generated IV in integrity metadata */ |
1449 | if (cc->integrity_iv_size) | |
1450 | memcpy(tag_iv, org_iv, cc->integrity_iv_size); | |
1451 | } | |
1452 | /* Working copy of IV, to be modified in crypto API */ | |
1453 | memcpy(iv, org_iv, cc->iv_size); | |
3a7f6c99 MB |
1454 | } |
1455 | ||
8f0009a2 | 1456 | skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); |
3a7f6c99 MB |
1457 | |
1458 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
bbdb23b5 | 1459 | r = crypto_skcipher_encrypt(req); |
3a7f6c99 | 1460 | else |
bbdb23b5 | 1461 | r = crypto_skcipher_decrypt(req); |
3a7f6c99 | 1462 | |
2dc5327d | 1463 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
ef43aa38 MB |
1464 | r = cc->iv_gen_ops->post(cc, org_iv, dmreq); |
1465 | ||
8f0009a2 MB |
1466 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); |
1467 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); | |
2dc5327d | 1468 | |
3a7f6c99 | 1469 | return r; |
01482b76 MB |
1470 | } |
1471 | ||
dcfe653d | 1472 | static void kcryptd_async_done(void *async_req, int error); |
c0297721 | 1473 | |
d68b2958 | 1474 | static int crypt_alloc_req_skcipher(struct crypt_config *cc, |
ef43aa38 | 1475 | struct convert_context *ctx) |
ddd42edf | 1476 | { |
86a3238c | 1477 | unsigned int key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 1478 | |
d68b2958 IK |
1479 | if (!ctx->r.req) { |
1480 | ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); | |
1481 | if (!ctx->r.req) | |
1482 | return -ENOMEM; | |
1483 | } | |
c0297721 | 1484 | |
ef43aa38 | 1485 | skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); |
54cea3f6 MB |
1486 | |
1487 | /* | |
1488 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs | |
1489 | * requests if driver request queue is full. | |
1490 | */ | |
ef43aa38 | 1491 | skcipher_request_set_callback(ctx->r.req, |
432061b3 | 1492 | CRYPTO_TFM_REQ_MAY_BACKLOG, |
ef43aa38 | 1493 | kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); |
d68b2958 IK |
1494 | |
1495 | return 0; | |
ddd42edf MB |
1496 | } |
1497 | ||
d68b2958 | 1498 | static int crypt_alloc_req_aead(struct crypt_config *cc, |
ef43aa38 MB |
1499 | struct convert_context *ctx) |
1500 | { | |
004b8ae9 IK |
1501 | if (!ctx->r.req_aead) { |
1502 | ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); | |
1503 | if (!ctx->r.req_aead) | |
d68b2958 IK |
1504 | return -ENOMEM; |
1505 | } | |
c0297721 | 1506 | |
ef43aa38 | 1507 | aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); |
54cea3f6 MB |
1508 | |
1509 | /* | |
1510 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs | |
1511 | * requests if driver request queue is full. | |
1512 | */ | |
ef43aa38 | 1513 | aead_request_set_callback(ctx->r.req_aead, |
432061b3 | 1514 | CRYPTO_TFM_REQ_MAY_BACKLOG, |
ef43aa38 | 1515 | kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); |
d68b2958 IK |
1516 | |
1517 | return 0; | |
ef43aa38 MB |
1518 | } |
1519 | ||
d68b2958 | 1520 | static int crypt_alloc_req(struct crypt_config *cc, |
ef43aa38 MB |
1521 | struct convert_context *ctx) |
1522 | { | |
33d2f09f | 1523 | if (crypt_integrity_aead(cc)) |
d68b2958 | 1524 | return crypt_alloc_req_aead(cc, ctx); |
ef43aa38 | 1525 | else |
d68b2958 | 1526 | return crypt_alloc_req_skcipher(cc, ctx); |
ddd42edf MB |
1527 | } |
1528 | ||
ef43aa38 MB |
1529 | static void crypt_free_req_skcipher(struct crypt_config *cc, |
1530 | struct skcipher_request *req, struct bio *base_bio) | |
298a9fa0 MP |
1531 | { |
1532 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
1533 | ||
bbdb23b5 | 1534 | if ((struct skcipher_request *)(io + 1) != req) |
6f1c819c | 1535 | mempool_free(req, &cc->req_pool); |
298a9fa0 MP |
1536 | } |
1537 | ||
ef43aa38 MB |
1538 | static void crypt_free_req_aead(struct crypt_config *cc, |
1539 | struct aead_request *req, struct bio *base_bio) | |
1540 | { | |
1541 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
1542 | ||
1543 | if ((struct aead_request *)(io + 1) != req) | |
6f1c819c | 1544 | mempool_free(req, &cc->req_pool); |
ef43aa38 MB |
1545 | } |
1546 | ||
1547 | static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) | |
1548 | { | |
33d2f09f | 1549 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
1550 | crypt_free_req_aead(cc, req, base_bio); |
1551 | else | |
1552 | crypt_free_req_skcipher(cc, req, base_bio); | |
1553 | } | |
1554 | ||
1da177e4 LT |
1555 | /* |
1556 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
1557 | */ | |
4e4cbee9 | 1558 | static blk_status_t crypt_convert(struct crypt_config *cc, |
8abec36d | 1559 | struct convert_context *ctx, bool atomic, bool reset_pending) |
1da177e4 | 1560 | { |
ef43aa38 | 1561 | unsigned int tag_offset = 0; |
ff3af92b | 1562 | unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; |
3f1e9070 | 1563 | int r; |
1da177e4 | 1564 | |
8abec36d IK |
1565 | /* |
1566 | * if reset_pending is set we are dealing with the bio for the first time, | |
1567 | * else we're continuing to work on the previous bio, so don't mess with | |
1568 | * the cc_pending counter | |
1569 | */ | |
1570 | if (reset_pending) | |
1571 | atomic_set(&ctx->cc_pending, 1); | |
c8081618 | 1572 | |
003b5c57 | 1573 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 1574 | |
d68b2958 IK |
1575 | r = crypt_alloc_req(cc, ctx); |
1576 | if (r) { | |
1577 | complete(&ctx->restart); | |
1578 | return BLK_STS_DEV_RESOURCE; | |
1579 | } | |
1580 | ||
40b6229b | 1581 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 1582 | |
33d2f09f | 1583 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
1584 | r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); |
1585 | else | |
1586 | r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); | |
3a7f6c99 MB |
1587 | |
1588 | switch (r) { | |
54cea3f6 MB |
1589 | /* |
1590 | * The request was queued by a crypto driver | |
1591 | * but the driver request queue is full, let's wait. | |
1592 | */ | |
3a7f6c99 | 1593 | case -EBUSY: |
8abec36d IK |
1594 | if (in_interrupt()) { |
1595 | if (try_wait_for_completion(&ctx->restart)) { | |
1596 | /* | |
1597 | * we don't have to block to wait for completion, | |
1598 | * so proceed | |
1599 | */ | |
1600 | } else { | |
1601 | /* | |
1602 | * we can't wait for completion without blocking | |
1603 | * exit and continue processing in a workqueue | |
1604 | */ | |
1605 | ctx->r.req = NULL; | |
1606 | ctx->cc_sector += sector_step; | |
1607 | tag_offset++; | |
1608 | return BLK_STS_DEV_RESOURCE; | |
1609 | } | |
1610 | } else { | |
1611 | wait_for_completion(&ctx->restart); | |
1612 | } | |
16735d02 | 1613 | reinit_completion(&ctx->restart); |
df561f66 | 1614 | fallthrough; |
54cea3f6 MB |
1615 | /* |
1616 | * The request is queued and processed asynchronously, | |
1617 | * completion function kcryptd_async_done() will be called. | |
1618 | */ | |
c0403ec0 | 1619 | case -EINPROGRESS: |
ef43aa38 | 1620 | ctx->r.req = NULL; |
8f0009a2 | 1621 | ctx->cc_sector += sector_step; |
583fe747 | 1622 | tag_offset++; |
3f1e9070 | 1623 | continue; |
54cea3f6 MB |
1624 | /* |
1625 | * The request was already processed (synchronously). | |
1626 | */ | |
3a7f6c99 | 1627 | case 0: |
40b6229b | 1628 | atomic_dec(&ctx->cc_pending); |
8f0009a2 | 1629 | ctx->cc_sector += sector_step; |
583fe747 | 1630 | tag_offset++; |
39d42fa9 IK |
1631 | if (!atomic) |
1632 | cond_resched(); | |
3a7f6c99 | 1633 | continue; |
ef43aa38 MB |
1634 | /* |
1635 | * There was a data integrity error. | |
1636 | */ | |
1637 | case -EBADMSG: | |
1638 | atomic_dec(&ctx->cc_pending); | |
4e4cbee9 | 1639 | return BLK_STS_PROTECTION; |
ef43aa38 MB |
1640 | /* |
1641 | * There was an error while processing the request. | |
1642 | */ | |
3f1e9070 | 1643 | default: |
40b6229b | 1644 | atomic_dec(&ctx->cc_pending); |
4e4cbee9 | 1645 | return BLK_STS_IOERR; |
3f1e9070 | 1646 | } |
1da177e4 LT |
1647 | } |
1648 | ||
3f1e9070 | 1649 | return 0; |
1da177e4 LT |
1650 | } |
1651 | ||
cf2f1abf MP |
1652 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
1653 | ||
1da177e4 LT |
1654 | /* |
1655 | * Generate a new unfragmented bio with the given size | |
586b286b MS |
1656 | * This should never violate the device limitations (but only because |
1657 | * max_segment_size is being constrained to PAGE_SIZE). | |
7145c241 MP |
1658 | * |
1659 | * This function may be called concurrently. If we allocate from the mempool | |
1660 | * concurrently, there is a possibility of deadlock. For example, if we have | |
1661 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from | |
1662 | * the mempool concurrently, it may deadlock in a situation where both processes | |
1663 | * have allocated 128 pages and the mempool is exhausted. | |
1664 | * | |
1665 | * In order to avoid this scenario we allocate the pages under a mutex. | |
1666 | * | |
1667 | * In order to not degrade performance with excessive locking, we try | |
1668 | * non-blocking allocations without a mutex first but on failure we fallback | |
1669 | * to blocking allocations with a mutex. | |
5054e778 MP |
1670 | * |
1671 | * In order to reduce allocation overhead, we try to allocate compound pages in | |
1672 | * the first pass. If they are not available, we fall back to the mempool. | |
1da177e4 | 1673 | */ |
86a3238c | 1674 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size) |
1da177e4 | 1675 | { |
49a8a920 | 1676 | struct crypt_config *cc = io->cc; |
8b004457 | 1677 | struct bio *clone; |
1da177e4 | 1678 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7145c241 | 1679 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
5054e778 | 1680 | unsigned int remaining_size; |
5e0a760b | 1681 | unsigned int order = MAX_PAGE_ORDER; |
1da177e4 | 1682 | |
7145c241 | 1683 | retry: |
d0164adc | 1684 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1685 | mutex_lock(&cc->bio_alloc_lock); |
1686 | ||
609be106 CH |
1687 | clone = bio_alloc_bioset(cc->dev->bdev, nr_iovecs, io->base_bio->bi_opf, |
1688 | GFP_NOIO, &cc->bs); | |
3f868c09 CH |
1689 | clone->bi_private = io; |
1690 | clone->bi_end_io = crypt_endio; | |
5d8d4081 | 1691 | clone->bi_ioprio = io->base_bio->bi_ioprio; |
6a24c718 | 1692 | |
7145c241 MP |
1693 | remaining_size = size; |
1694 | ||
5054e778 MP |
1695 | while (remaining_size) { |
1696 | struct page *pages; | |
1697 | unsigned size_to_add; | |
1698 | unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT); | |
1699 | order = min(order, remaining_order); | |
1700 | ||
1701 | while (order > 0) { | |
9793c269 MP |
1702 | if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) + |
1703 | (1 << order) > dm_crypt_pages_per_client)) | |
1704 | goto decrease_order; | |
5054e778 MP |
1705 | pages = alloc_pages(gfp_mask |
1706 | | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP, | |
1707 | order); | |
9793c269 MP |
1708 | if (likely(pages != NULL)) { |
1709 | percpu_counter_add(&cc->n_allocated_pages, 1 << order); | |
5054e778 | 1710 | goto have_pages; |
9793c269 MP |
1711 | } |
1712 | decrease_order: | |
5054e778 MP |
1713 | order--; |
1714 | } | |
1715 | ||
1716 | pages = mempool_alloc(&cc->page_pool, gfp_mask); | |
1717 | if (!pages) { | |
7145c241 MP |
1718 | crypt_free_buffer_pages(cc, clone); |
1719 | bio_put(clone); | |
d0164adc | 1720 | gfp_mask |= __GFP_DIRECT_RECLAIM; |
5054e778 | 1721 | order = 0; |
7145c241 MP |
1722 | goto retry; |
1723 | } | |
1da177e4 | 1724 | |
5054e778 MP |
1725 | have_pages: |
1726 | size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size); | |
1727 | __bio_add_page(clone, pages, size_to_add, 0); | |
1728 | remaining_size -= size_to_add; | |
1da177e4 LT |
1729 | } |
1730 | ||
ef43aa38 MB |
1731 | /* Allocate space for integrity tags */ |
1732 | if (dm_crypt_integrity_io_alloc(io, clone)) { | |
1733 | crypt_free_buffer_pages(cc, clone); | |
1734 | bio_put(clone); | |
1735 | clone = NULL; | |
1736 | } | |
53db984e | 1737 | |
d0164adc | 1738 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
7145c241 MP |
1739 | mutex_unlock(&cc->bio_alloc_lock); |
1740 | ||
8b004457 | 1741 | return clone; |
1da177e4 LT |
1742 | } |
1743 | ||
644bd2f0 | 1744 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1745 | { |
5054e778 | 1746 | struct folio_iter fi; |
1da177e4 | 1747 | |
5054e778 MP |
1748 | if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */ |
1749 | bio_for_each_folio_all(fi, clone) { | |
9793c269 MP |
1750 | if (folio_test_large(fi.folio)) { |
1751 | percpu_counter_sub(&cc->n_allocated_pages, | |
1752 | 1 << folio_order(fi.folio)); | |
5054e778 | 1753 | folio_put(fi.folio); |
9793c269 | 1754 | } else { |
5054e778 | 1755 | mempool_free(&fi.folio->page, &cc->page_pool); |
9793c269 | 1756 | } |
5054e778 | 1757 | } |
1da177e4 LT |
1758 | } |
1759 | } | |
1760 | ||
298a9fa0 MP |
1761 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1762 | struct bio *bio, sector_t sector) | |
dc440d1e | 1763 | { |
49a8a920 | 1764 | io->cc = cc; |
dc440d1e MB |
1765 | io->base_bio = bio; |
1766 | io->sector = sector; | |
1767 | io->error = 0; | |
42e15d12 MP |
1768 | io->ctx.aead_recheck = false; |
1769 | io->ctx.aead_failed = false; | |
ef43aa38 MB |
1770 | io->ctx.r.req = NULL; |
1771 | io->integrity_metadata = NULL; | |
1772 | io->integrity_metadata_from_pool = false; | |
40b6229b | 1773 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1774 | } |
1775 | ||
3e1a8bdd MB |
1776 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1777 | { | |
40b6229b | 1778 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1779 | } |
1780 | ||
42e15d12 MP |
1781 | static void kcryptd_queue_read(struct dm_crypt_io *io); |
1782 | ||
1da177e4 LT |
1783 | /* |
1784 | * One of the bios was finished. Check for completion of | |
1785 | * the whole request and correctly clean up the buffer. | |
1786 | */ | |
5742fd77 | 1787 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1788 | { |
49a8a920 | 1789 | struct crypt_config *cc = io->cc; |
b35f8caa | 1790 | struct bio *base_bio = io->base_bio; |
4e4cbee9 | 1791 | blk_status_t error = io->error; |
1da177e4 | 1792 | |
40b6229b | 1793 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1794 | return; |
1795 | ||
42e15d12 MP |
1796 | if (likely(!io->ctx.aead_recheck) && unlikely(io->ctx.aead_failed) && |
1797 | cc->on_disk_tag_size && bio_data_dir(base_bio) == READ) { | |
1798 | io->ctx.aead_recheck = true; | |
1799 | io->ctx.aead_failed = false; | |
1800 | io->error = 0; | |
1801 | kcryptd_queue_read(io); | |
1802 | return; | |
1803 | } | |
1804 | ||
ef43aa38 MB |
1805 | if (io->ctx.r.req) |
1806 | crypt_free_req(cc, io->ctx.r.req, base_bio); | |
1807 | ||
1808 | if (unlikely(io->integrity_metadata_from_pool)) | |
6f1c819c | 1809 | mempool_free(io->integrity_metadata, &io->cc->tag_pool); |
ef43aa38 MB |
1810 | else |
1811 | kfree(io->integrity_metadata); | |
b35f8caa | 1812 | |
4e4cbee9 | 1813 | base_bio->bi_status = error; |
8e14f610 | 1814 | |
d9a02e01 | 1815 | bio_endio(base_bio); |
1da177e4 LT |
1816 | } |
1817 | ||
1818 | /* | |
cabf08e4 | 1819 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1820 | * |
1821 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1822 | * interrupt context. |
cabf08e4 MB |
1823 | * |
1824 | * kcryptd performs the actual encryption or decryption. | |
1825 | * | |
1826 | * kcryptd_io performs the IO submission. | |
1827 | * | |
1828 | * They must be separated as otherwise the final stages could be | |
1829 | * starved by new requests which can block in the first stages due | |
1830 | * to memory allocation. | |
c0297721 AK |
1831 | * |
1832 | * The work is done per CPU global for all dm-crypt instances. | |
1833 | * They should not depend on each other and do not block. | |
1da177e4 | 1834 | */ |
4246a0b6 | 1835 | static void crypt_endio(struct bio *clone) |
8b004457 | 1836 | { |
028867ac | 1837 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1838 | struct crypt_config *cc = io->cc; |
86a3238c | 1839 | unsigned int rw = bio_data_dir(clone); |
42e15d12 MP |
1840 | blk_status_t error = clone->bi_status; |
1841 | ||
1842 | if (io->ctx.aead_recheck && !error) { | |
1843 | kcryptd_queue_crypt(io); | |
1844 | return; | |
1845 | } | |
8b004457 MB |
1846 | |
1847 | /* | |
6712ecf8 | 1848 | * free the processed pages |
8b004457 | 1849 | */ |
42e15d12 | 1850 | if (rw == WRITE || io->ctx.aead_recheck) |
644bd2f0 | 1851 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1852 | |
1853 | bio_put(clone); | |
8b004457 | 1854 | |
9b81c842 | 1855 | if (rw == READ && !error) { |
ee7a491e MB |
1856 | kcryptd_queue_crypt(io); |
1857 | return; | |
1858 | } | |
5742fd77 | 1859 | |
9b81c842 SL |
1860 | if (unlikely(error)) |
1861 | io->error = error; | |
5742fd77 MB |
1862 | |
1863 | crypt_dec_pending(io); | |
8b004457 MB |
1864 | } |
1865 | ||
e5524e12 MS |
1866 | #define CRYPT_MAP_READ_GFP GFP_NOWAIT |
1867 | ||
20c82538 | 1868 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1869 | { |
49a8a920 | 1870 | struct crypt_config *cc = io->cc; |
8b004457 | 1871 | struct bio *clone; |
93e605c2 | 1872 | |
42e15d12 MP |
1873 | if (io->ctx.aead_recheck) { |
1874 | if (!(gfp & __GFP_DIRECT_RECLAIM)) | |
1875 | return 1; | |
1876 | crypt_inc_pending(io); | |
1877 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); | |
1878 | if (unlikely(!clone)) { | |
1879 | crypt_dec_pending(io); | |
1880 | return 1; | |
1881 | } | |
1882 | clone->bi_iter.bi_sector = cc->start + io->sector; | |
1883 | crypt_convert_init(cc, &io->ctx, clone, clone, io->sector); | |
1884 | io->saved_bi_iter = clone->bi_iter; | |
1885 | dm_submit_bio_remap(io->base_bio, clone); | |
1886 | return 0; | |
1887 | } | |
1888 | ||
8b004457 | 1889 | /* |
abfc426d CH |
1890 | * We need the original biovec array in order to decrypt the whole bio |
1891 | * data *afterwards* -- thanks to immutable biovecs we don't need to | |
1892 | * worry about the block layer modifying the biovec array; so leverage | |
1893 | * bio_alloc_clone(). | |
8b004457 | 1894 | */ |
abfc426d | 1895 | clone = bio_alloc_clone(cc->dev->bdev, io->base_bio, gfp, &cc->bs); |
7eaceacc | 1896 | if (!clone) |
20c82538 | 1897 | return 1; |
3f868c09 CH |
1898 | clone->bi_private = io; |
1899 | clone->bi_end_io = crypt_endio; | |
8b004457 | 1900 | |
20c82538 MB |
1901 | crypt_inc_pending(io); |
1902 | ||
4f024f37 | 1903 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1904 | |
ef43aa38 MB |
1905 | if (dm_crypt_integrity_io_alloc(io, clone)) { |
1906 | crypt_dec_pending(io); | |
1907 | bio_put(clone); | |
1908 | return 1; | |
1909 | } | |
1910 | ||
b7f8dff0 | 1911 | dm_submit_bio_remap(io->base_bio, clone); |
20c82538 | 1912 | return 0; |
8b004457 MB |
1913 | } |
1914 | ||
dc267621 MP |
1915 | static void kcryptd_io_read_work(struct work_struct *work) |
1916 | { | |
1917 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1918 | ||
1919 | crypt_inc_pending(io); | |
1920 | if (kcryptd_io_read(io, GFP_NOIO)) | |
4e4cbee9 | 1921 | io->error = BLK_STS_RESOURCE; |
dc267621 MP |
1922 | crypt_dec_pending(io); |
1923 | } | |
1924 | ||
1925 | static void kcryptd_queue_read(struct dm_crypt_io *io) | |
1926 | { | |
1927 | struct crypt_config *cc = io->cc; | |
1928 | ||
1929 | INIT_WORK(&io->work, kcryptd_io_read_work); | |
1930 | queue_work(cc->io_queue, &io->work); | |
1931 | } | |
1932 | ||
4e4eef64 MB |
1933 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1934 | { | |
95497a96 | 1935 | struct bio *clone = io->ctx.bio_out; |
dc267621 | 1936 | |
b7f8dff0 | 1937 | dm_submit_bio_remap(io->base_bio, clone); |
4e4eef64 MB |
1938 | } |
1939 | ||
b3c5fd30 MP |
1940 | #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) |
1941 | ||
dc267621 | 1942 | static int dmcrypt_write(void *data) |
395b167c | 1943 | { |
dc267621 | 1944 | struct crypt_config *cc = data; |
b3c5fd30 MP |
1945 | struct dm_crypt_io *io; |
1946 | ||
dc267621 | 1947 | while (1) { |
b3c5fd30 | 1948 | struct rb_root write_tree; |
dc267621 | 1949 | struct blk_plug plug; |
395b167c | 1950 | |
c7329eff | 1951 | spin_lock_irq(&cc->write_thread_lock); |
dc267621 | 1952 | continue_locked: |
395b167c | 1953 | |
b3c5fd30 | 1954 | if (!RB_EMPTY_ROOT(&cc->write_tree)) |
dc267621 MP |
1955 | goto pop_from_list; |
1956 | ||
f659b100 | 1957 | set_current_state(TASK_INTERRUPTIBLE); |
dc267621 | 1958 | |
c7329eff | 1959 | spin_unlock_irq(&cc->write_thread_lock); |
dc267621 | 1960 | |
f659b100 | 1961 | if (unlikely(kthread_should_stop())) { |
642fa448 | 1962 | set_current_state(TASK_RUNNING); |
f659b100 RV |
1963 | break; |
1964 | } | |
1965 | ||
dc267621 MP |
1966 | schedule(); |
1967 | ||
c7329eff | 1968 | spin_lock_irq(&cc->write_thread_lock); |
dc267621 MP |
1969 | goto continue_locked; |
1970 | ||
1971 | pop_from_list: | |
b3c5fd30 MP |
1972 | write_tree = cc->write_tree; |
1973 | cc->write_tree = RB_ROOT; | |
c7329eff | 1974 | spin_unlock_irq(&cc->write_thread_lock); |
dc267621 | 1975 | |
b3c5fd30 MP |
1976 | BUG_ON(rb_parent(write_tree.rb_node)); |
1977 | ||
1978 | /* | |
1979 | * Note: we cannot walk the tree here with rb_next because | |
1980 | * the structures may be freed when kcryptd_io_write is called. | |
1981 | */ | |
dc267621 MP |
1982 | blk_start_plug(&plug); |
1983 | do { | |
b3c5fd30 MP |
1984 | io = crypt_io_from_node(rb_first(&write_tree)); |
1985 | rb_erase(&io->rb_node, &write_tree); | |
dc267621 | 1986 | kcryptd_io_write(io); |
fb294b1c | 1987 | cond_resched(); |
b3c5fd30 | 1988 | } while (!RB_EMPTY_ROOT(&write_tree)); |
dc267621 MP |
1989 | blk_finish_plug(&plug); |
1990 | } | |
1991 | return 0; | |
395b167c AK |
1992 | } |
1993 | ||
72c6e7af | 1994 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1995 | { |
dec1cedf | 1996 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1997 | struct crypt_config *cc = io->cc; |
dc267621 | 1998 | unsigned long flags; |
b3c5fd30 MP |
1999 | sector_t sector; |
2000 | struct rb_node **rbp, *parent; | |
dec1cedf | 2001 | |
4e4cbee9 | 2002 | if (unlikely(io->error)) { |
dec1cedf MB |
2003 | crypt_free_buffer_pages(cc, clone); |
2004 | bio_put(clone); | |
6c031f41 | 2005 | crypt_dec_pending(io); |
dec1cedf MB |
2006 | return; |
2007 | } | |
2008 | ||
2009 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 2010 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 2011 | |
4f024f37 | 2012 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 2013 | |
39d42fa9 IK |
2014 | if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) || |
2015 | test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) { | |
b7f8dff0 | 2016 | dm_submit_bio_remap(io->base_bio, clone); |
0f5d8e6e MP |
2017 | return; |
2018 | } | |
2019 | ||
c7329eff MP |
2020 | spin_lock_irqsave(&cc->write_thread_lock, flags); |
2021 | if (RB_EMPTY_ROOT(&cc->write_tree)) | |
2022 | wake_up_process(cc->write_thread); | |
b3c5fd30 MP |
2023 | rbp = &cc->write_tree.rb_node; |
2024 | parent = NULL; | |
2025 | sector = io->sector; | |
2026 | while (*rbp) { | |
2027 | parent = *rbp; | |
2028 | if (sector < crypt_io_from_node(parent)->sector) | |
2029 | rbp = &(*rbp)->rb_left; | |
2030 | else | |
2031 | rbp = &(*rbp)->rb_right; | |
2032 | } | |
2033 | rb_link_node(&io->rb_node, parent, rbp); | |
2034 | rb_insert_color(&io->rb_node, &cc->write_tree); | |
c7329eff | 2035 | spin_unlock_irqrestore(&cc->write_thread_lock, flags); |
4e4eef64 MB |
2036 | } |
2037 | ||
8e225f04 DLM |
2038 | static bool kcryptd_crypt_write_inline(struct crypt_config *cc, |
2039 | struct convert_context *ctx) | |
2040 | ||
2041 | { | |
2042 | if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags)) | |
2043 | return false; | |
2044 | ||
2045 | /* | |
2046 | * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering | |
2047 | * constraints so they do not need to be issued inline by | |
2048 | * kcryptd_crypt_write_convert(). | |
2049 | */ | |
2050 | switch (bio_op(ctx->bio_in)) { | |
2051 | case REQ_OP_WRITE: | |
8e225f04 DLM |
2052 | case REQ_OP_WRITE_ZEROES: |
2053 | return true; | |
2054 | default: | |
2055 | return false; | |
2056 | } | |
2057 | } | |
2058 | ||
8abec36d IK |
2059 | static void kcryptd_crypt_write_continue(struct work_struct *work) |
2060 | { | |
2061 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
2062 | struct crypt_config *cc = io->cc; | |
2063 | struct convert_context *ctx = &io->ctx; | |
2064 | int crypt_finished; | |
2065 | sector_t sector = io->sector; | |
2066 | blk_status_t r; | |
2067 | ||
2068 | wait_for_completion(&ctx->restart); | |
2069 | reinit_completion(&ctx->restart); | |
2070 | ||
2071 | r = crypt_convert(cc, &io->ctx, true, false); | |
2072 | if (r) | |
2073 | io->error = r; | |
2074 | crypt_finished = atomic_dec_and_test(&ctx->cc_pending); | |
2075 | if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { | |
2076 | /* Wait for completion signaled by kcryptd_async_done() */ | |
2077 | wait_for_completion(&ctx->restart); | |
2078 | crypt_finished = 1; | |
2079 | } | |
2080 | ||
2081 | /* Encryption was already finished, submit io now */ | |
2082 | if (crypt_finished) { | |
2083 | kcryptd_crypt_write_io_submit(io, 0); | |
2084 | io->sector = sector; | |
2085 | } | |
2086 | ||
2087 | crypt_dec_pending(io); | |
2088 | } | |
2089 | ||
fc5a5e9a | 2090 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 2091 | { |
49a8a920 | 2092 | struct crypt_config *cc = io->cc; |
8e225f04 | 2093 | struct convert_context *ctx = &io->ctx; |
8b004457 | 2094 | struct bio *clone; |
c8081618 | 2095 | int crypt_finished; |
b635b00e | 2096 | sector_t sector = io->sector; |
4e4cbee9 | 2097 | blk_status_t r; |
8b004457 | 2098 | |
fc5a5e9a MB |
2099 | /* |
2100 | * Prevent io from disappearing until this function completes. | |
2101 | */ | |
2102 | crypt_inc_pending(io); | |
8e225f04 | 2103 | crypt_convert_init(cc, ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 2104 | |
cf2f1abf MP |
2105 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
2106 | if (unlikely(!clone)) { | |
4e4cbee9 | 2107 | io->error = BLK_STS_IOERR; |
cf2f1abf MP |
2108 | goto dec; |
2109 | } | |
c8081618 | 2110 | |
cf2f1abf MP |
2111 | io->ctx.bio_out = clone; |
2112 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 2113 | |
50c70240 MP |
2114 | if (crypt_integrity_aead(cc)) { |
2115 | bio_copy_data(clone, io->base_bio); | |
2116 | io->ctx.bio_in = clone; | |
2117 | io->ctx.iter_in = clone->bi_iter; | |
2118 | } | |
2119 | ||
cf2f1abf | 2120 | sector += bio_sectors(clone); |
93e605c2 | 2121 | |
cf2f1abf | 2122 | crypt_inc_pending(io); |
8e225f04 | 2123 | r = crypt_convert(cc, ctx, |
8abec36d IK |
2124 | test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true); |
2125 | /* | |
2126 | * Crypto API backlogged the request, because its queue was full | |
2127 | * and we're in softirq context, so continue from a workqueue | |
2128 | * (TODO: is it actually possible to be in softirq in the write path?) | |
2129 | */ | |
2130 | if (r == BLK_STS_DEV_RESOURCE) { | |
2131 | INIT_WORK(&io->work, kcryptd_crypt_write_continue); | |
2132 | queue_work(cc->crypt_queue, &io->work); | |
2133 | return; | |
2134 | } | |
4e4cbee9 | 2135 | if (r) |
ef43aa38 | 2136 | io->error = r; |
8e225f04 DLM |
2137 | crypt_finished = atomic_dec_and_test(&ctx->cc_pending); |
2138 | if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { | |
2139 | /* Wait for completion signaled by kcryptd_async_done() */ | |
2140 | wait_for_completion(&ctx->restart); | |
2141 | crypt_finished = 1; | |
2142 | } | |
933f01d4 | 2143 | |
cf2f1abf MP |
2144 | /* Encryption was already finished, submit io now */ |
2145 | if (crypt_finished) { | |
2146 | kcryptd_crypt_write_io_submit(io, 0); | |
2147 | io->sector = sector; | |
93e605c2 | 2148 | } |
899c95d3 | 2149 | |
cf2f1abf | 2150 | dec: |
899c95d3 | 2151 | crypt_dec_pending(io); |
84131db6 MB |
2152 | } |
2153 | ||
72c6e7af | 2154 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 2155 | { |
42e15d12 MP |
2156 | if (io->ctx.aead_recheck) { |
2157 | if (!io->error) { | |
2158 | io->ctx.bio_in->bi_iter = io->saved_bi_iter; | |
2159 | bio_copy_data(io->base_bio, io->ctx.bio_in); | |
2160 | } | |
2161 | crypt_free_buffer_pages(io->cc, io->ctx.bio_in); | |
2162 | bio_put(io->ctx.bio_in); | |
2163 | } | |
5742fd77 MB |
2164 | crypt_dec_pending(io); |
2165 | } | |
2166 | ||
8abec36d IK |
2167 | static void kcryptd_crypt_read_continue(struct work_struct *work) |
2168 | { | |
2169 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
2170 | struct crypt_config *cc = io->cc; | |
2171 | blk_status_t r; | |
2172 | ||
2173 | wait_for_completion(&io->ctx.restart); | |
2174 | reinit_completion(&io->ctx.restart); | |
2175 | ||
2176 | r = crypt_convert(cc, &io->ctx, true, false); | |
2177 | if (r) | |
2178 | io->error = r; | |
2179 | ||
2180 | if (atomic_dec_and_test(&io->ctx.cc_pending)) | |
2181 | kcryptd_crypt_read_done(io); | |
2182 | ||
2183 | crypt_dec_pending(io); | |
2184 | } | |
2185 | ||
4e4eef64 | 2186 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 2187 | { |
49a8a920 | 2188 | struct crypt_config *cc = io->cc; |
4e4cbee9 | 2189 | blk_status_t r; |
1da177e4 | 2190 | |
3e1a8bdd | 2191 | crypt_inc_pending(io); |
3a7f6c99 | 2192 | |
42e15d12 MP |
2193 | if (io->ctx.aead_recheck) { |
2194 | io->ctx.cc_sector = io->sector + cc->iv_offset; | |
2195 | r = crypt_convert(cc, &io->ctx, | |
2196 | test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); | |
2197 | } else { | |
2198 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, | |
2199 | io->sector); | |
1da177e4 | 2200 | |
42e15d12 MP |
2201 | r = crypt_convert(cc, &io->ctx, |
2202 | test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); | |
2203 | } | |
8abec36d IK |
2204 | /* |
2205 | * Crypto API backlogged the request, because its queue was full | |
2206 | * and we're in softirq context, so continue from a workqueue | |
2207 | */ | |
2208 | if (r == BLK_STS_DEV_RESOURCE) { | |
2209 | INIT_WORK(&io->work, kcryptd_crypt_read_continue); | |
2210 | queue_work(cc->crypt_queue, &io->work); | |
2211 | return; | |
2212 | } | |
4e4cbee9 | 2213 | if (r) |
ef43aa38 | 2214 | io->error = r; |
5742fd77 | 2215 | |
40b6229b | 2216 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 2217 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
2218 | |
2219 | crypt_dec_pending(io); | |
1da177e4 LT |
2220 | } |
2221 | ||
dcfe653d | 2222 | static void kcryptd_async_done(void *data, int error) |
95497a96 | 2223 | { |
dcfe653d | 2224 | struct dm_crypt_request *dmreq = data; |
b2174eeb | 2225 | struct convert_context *ctx = dmreq->ctx; |
95497a96 | 2226 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 2227 | struct crypt_config *cc = io->cc; |
95497a96 | 2228 | |
54cea3f6 MB |
2229 | /* |
2230 | * A request from crypto driver backlog is going to be processed now, | |
2231 | * finish the completion and continue in crypt_convert(). | |
2232 | * (Callback will be called for the second time for this request.) | |
2233 | */ | |
c0403ec0 RV |
2234 | if (error == -EINPROGRESS) { |
2235 | complete(&ctx->restart); | |
95497a96 | 2236 | return; |
c0403ec0 | 2237 | } |
95497a96 | 2238 | |
2dc5327d | 2239 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
ef43aa38 | 2240 | error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); |
2dc5327d | 2241 | |
ef43aa38 | 2242 | if (error == -EBADMSG) { |
58d0f180 MW |
2243 | sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)); |
2244 | ||
42e15d12 MP |
2245 | ctx->aead_failed = true; |
2246 | if (ctx->aead_recheck) { | |
2247 | DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu", | |
2248 | ctx->bio_in->bi_bdev, s); | |
2249 | dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", | |
2250 | ctx->bio_in, s, 0); | |
2251 | } | |
4e4cbee9 | 2252 | io->error = BLK_STS_PROTECTION; |
ef43aa38 | 2253 | } else if (error < 0) |
4e4cbee9 | 2254 | io->error = BLK_STS_IOERR; |
72c6e7af | 2255 | |
298a9fa0 | 2256 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 2257 | |
40b6229b | 2258 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
c0403ec0 | 2259 | return; |
95497a96 | 2260 | |
8e225f04 DLM |
2261 | /* |
2262 | * The request is fully completed: for inline writes, let | |
2263 | * kcryptd_crypt_write_convert() do the IO submission. | |
2264 | */ | |
2265 | if (bio_data_dir(io->base_bio) == READ) { | |
72c6e7af | 2266 | kcryptd_crypt_read_done(io); |
8e225f04 DLM |
2267 | return; |
2268 | } | |
2269 | ||
2270 | if (kcryptd_crypt_write_inline(cc, ctx)) { | |
2271 | complete(&ctx->restart); | |
2272 | return; | |
2273 | } | |
2274 | ||
2275 | kcryptd_crypt_write_io_submit(io, 1); | |
95497a96 MB |
2276 | } |
2277 | ||
395b167c | 2278 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 2279 | { |
028867ac | 2280 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 2281 | |
cabf08e4 | 2282 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 2283 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 2284 | else |
395b167c | 2285 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
2286 | } |
2287 | ||
395b167c | 2288 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 2289 | { |
49a8a920 | 2290 | struct crypt_config *cc = io->cc; |
cabf08e4 | 2291 | |
39d42fa9 IK |
2292 | if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) || |
2293 | (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) { | |
c87a95dc | 2294 | /* |
d3703ef3 | 2295 | * in_hardirq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context. |
c87a95dc IK |
2296 | * irqs_disabled(): the kernel may run some IO completion from the idle thread, but |
2297 | * it is being executed with irqs disabled. | |
2298 | */ | |
fb6ad4ae TH |
2299 | if (in_hardirq() || irqs_disabled()) { |
2300 | INIT_WORK(&io->work, kcryptd_crypt); | |
2301 | queue_work(system_bh_wq, &io->work); | |
2302 | return; | |
2303 | } else { | |
0a9bab39 | 2304 | kcryptd_crypt(&io->work); |
39d42fa9 IK |
2305 | return; |
2306 | } | |
39d42fa9 IK |
2307 | } |
2308 | ||
395b167c AK |
2309 | INIT_WORK(&io->work, kcryptd_crypt); |
2310 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
2311 | } |
2312 | ||
ef43aa38 | 2313 | static void crypt_free_tfms_aead(struct crypt_config *cc) |
1da177e4 | 2314 | { |
ef43aa38 MB |
2315 | if (!cc->cipher_tfm.tfms_aead) |
2316 | return; | |
1da177e4 | 2317 | |
ef43aa38 MB |
2318 | if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { |
2319 | crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); | |
2320 | cc->cipher_tfm.tfms_aead[0] = NULL; | |
1da177e4 LT |
2321 | } |
2322 | ||
ef43aa38 MB |
2323 | kfree(cc->cipher_tfm.tfms_aead); |
2324 | cc->cipher_tfm.tfms_aead = NULL; | |
1da177e4 LT |
2325 | } |
2326 | ||
ef43aa38 | 2327 | static void crypt_free_tfms_skcipher(struct crypt_config *cc) |
d1f96423 | 2328 | { |
86a3238c | 2329 | unsigned int i; |
d1f96423 | 2330 | |
ef43aa38 | 2331 | if (!cc->cipher_tfm.tfms) |
fd2d231f MP |
2332 | return; |
2333 | ||
d1f96423 | 2334 | for (i = 0; i < cc->tfms_count; i++) |
ef43aa38 MB |
2335 | if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { |
2336 | crypto_free_skcipher(cc->cipher_tfm.tfms[i]); | |
2337 | cc->cipher_tfm.tfms[i] = NULL; | |
d1f96423 | 2338 | } |
fd2d231f | 2339 | |
ef43aa38 MB |
2340 | kfree(cc->cipher_tfm.tfms); |
2341 | cc->cipher_tfm.tfms = NULL; | |
d1f96423 MB |
2342 | } |
2343 | ||
ef43aa38 MB |
2344 | static void crypt_free_tfms(struct crypt_config *cc) |
2345 | { | |
33d2f09f | 2346 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
2347 | crypt_free_tfms_aead(cc); |
2348 | else | |
2349 | crypt_free_tfms_skcipher(cc); | |
2350 | } | |
2351 | ||
2352 | static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) | |
d1f96423 | 2353 | { |
86a3238c | 2354 | unsigned int i; |
d1f96423 MB |
2355 | int err; |
2356 | ||
6396bb22 KC |
2357 | cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, |
2358 | sizeof(struct crypto_skcipher *), | |
2359 | GFP_KERNEL); | |
ef43aa38 | 2360 | if (!cc->cipher_tfm.tfms) |
fd2d231f MP |
2361 | return -ENOMEM; |
2362 | ||
d1f96423 | 2363 | for (i = 0; i < cc->tfms_count; i++) { |
cd746938 MP |
2364 | cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, |
2365 | CRYPTO_ALG_ALLOCATES_MEMORY); | |
ef43aa38 MB |
2366 | if (IS_ERR(cc->cipher_tfm.tfms[i])) { |
2367 | err = PTR_ERR(cc->cipher_tfm.tfms[i]); | |
fd2d231f | 2368 | crypt_free_tfms(cc); |
d1f96423 MB |
2369 | return err; |
2370 | } | |
2371 | } | |
2372 | ||
af331eba EB |
2373 | /* |
2374 | * dm-crypt performance can vary greatly depending on which crypto | |
2375 | * algorithm implementation is used. Help people debug performance | |
2376 | * problems by logging the ->cra_driver_name. | |
2377 | */ | |
7a1cd723 | 2378 | DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, |
af331eba | 2379 | crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); |
d1f96423 MB |
2380 | return 0; |
2381 | } | |
2382 | ||
ef43aa38 MB |
2383 | static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) |
2384 | { | |
ef43aa38 MB |
2385 | int err; |
2386 | ||
2387 | cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); | |
2388 | if (!cc->cipher_tfm.tfms) | |
2389 | return -ENOMEM; | |
2390 | ||
cd746938 MP |
2391 | cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, |
2392 | CRYPTO_ALG_ALLOCATES_MEMORY); | |
ef43aa38 MB |
2393 | if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { |
2394 | err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); | |
2395 | crypt_free_tfms(cc); | |
2396 | return err; | |
2397 | } | |
2398 | ||
7a1cd723 | 2399 | DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, |
af331eba | 2400 | crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); |
ef43aa38 MB |
2401 | return 0; |
2402 | } | |
2403 | ||
2404 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) | |
2405 | { | |
33d2f09f | 2406 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
2407 | return crypt_alloc_tfms_aead(cc, ciphermode); |
2408 | else | |
2409 | return crypt_alloc_tfms_skcipher(cc, ciphermode); | |
2410 | } | |
2411 | ||
86a3238c | 2412 | static unsigned int crypt_subkey_size(struct crypt_config *cc) |
ef43aa38 MB |
2413 | { |
2414 | return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
2415 | } | |
2416 | ||
86a3238c | 2417 | static unsigned int crypt_authenckey_size(struct crypt_config *cc) |
ef43aa38 MB |
2418 | { |
2419 | return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); | |
2420 | } | |
2421 | ||
2422 | /* | |
2423 | * If AEAD is composed like authenc(hmac(sha256),xts(aes)), | |
2424 | * the key must be for some reason in special format. | |
2425 | * This funcion converts cc->key to this special format. | |
2426 | */ | |
2427 | static void crypt_copy_authenckey(char *p, const void *key, | |
86a3238c | 2428 | unsigned int enckeylen, unsigned int authkeylen) |
ef43aa38 MB |
2429 | { |
2430 | struct crypto_authenc_key_param *param; | |
2431 | struct rtattr *rta; | |
2432 | ||
2433 | rta = (struct rtattr *)p; | |
2434 | param = RTA_DATA(rta); | |
2435 | param->enckeylen = cpu_to_be32(enckeylen); | |
2436 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
2437 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
2438 | p += RTA_SPACE(sizeof(*param)); | |
2439 | memcpy(p, key + enckeylen, authkeylen); | |
2440 | p += authkeylen; | |
2441 | memcpy(p, key, enckeylen); | |
2442 | } | |
2443 | ||
671ea6b4 | 2444 | static int crypt_setkey(struct crypt_config *cc) |
c0297721 | 2445 | { |
86a3238c | 2446 | unsigned int subkey_size; |
fd2d231f MP |
2447 | int err = 0, i, r; |
2448 | ||
da31a078 | 2449 | /* Ignore extra keys (which are used for IV etc) */ |
ef43aa38 | 2450 | subkey_size = crypt_subkey_size(cc); |
da31a078 | 2451 | |
27c70036 MB |
2452 | if (crypt_integrity_hmac(cc)) { |
2453 | if (subkey_size < cc->key_mac_size) | |
2454 | return -EINVAL; | |
2455 | ||
ef43aa38 MB |
2456 | crypt_copy_authenckey(cc->authenc_key, cc->key, |
2457 | subkey_size - cc->key_mac_size, | |
2458 | cc->key_mac_size); | |
27c70036 MB |
2459 | } |
2460 | ||
fd2d231f | 2461 | for (i = 0; i < cc->tfms_count; i++) { |
33d2f09f | 2462 | if (crypt_integrity_hmac(cc)) |
ef43aa38 MB |
2463 | r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], |
2464 | cc->authenc_key, crypt_authenckey_size(cc)); | |
33d2f09f MB |
2465 | else if (crypt_integrity_aead(cc)) |
2466 | r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], | |
2467 | cc->key + (i * subkey_size), | |
2468 | subkey_size); | |
ef43aa38 MB |
2469 | else |
2470 | r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], | |
2471 | cc->key + (i * subkey_size), | |
2472 | subkey_size); | |
fd2d231f MP |
2473 | if (r) |
2474 | err = r; | |
c0297721 AK |
2475 | } |
2476 | ||
ef43aa38 MB |
2477 | if (crypt_integrity_hmac(cc)) |
2478 | memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); | |
2479 | ||
c0297721 AK |
2480 | return err; |
2481 | } | |
2482 | ||
c538f6ec OK |
2483 | #ifdef CONFIG_KEYS |
2484 | ||
027c431c OK |
2485 | static bool contains_whitespace(const char *str) |
2486 | { | |
2487 | while (*str) | |
2488 | if (isspace(*str++)) | |
2489 | return true; | |
2490 | return false; | |
2491 | } | |
2492 | ||
27f5411a DB |
2493 | static int set_key_user(struct crypt_config *cc, struct key *key) |
2494 | { | |
2495 | const struct user_key_payload *ukp; | |
2496 | ||
2497 | ukp = user_key_payload_locked(key); | |
2498 | if (!ukp) | |
2499 | return -EKEYREVOKED; | |
2500 | ||
2501 | if (cc->key_size != ukp->datalen) | |
2502 | return -EINVAL; | |
2503 | ||
2504 | memcpy(cc->key, ukp->data, cc->key_size); | |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | ||
27f5411a DB |
2509 | static int set_key_encrypted(struct crypt_config *cc, struct key *key) |
2510 | { | |
2511 | const struct encrypted_key_payload *ekp; | |
2512 | ||
2513 | ekp = key->payload.data[0]; | |
2514 | if (!ekp) | |
2515 | return -EKEYREVOKED; | |
2516 | ||
2517 | if (cc->key_size != ekp->decrypted_datalen) | |
2518 | return -EINVAL; | |
2519 | ||
2520 | memcpy(cc->key, ekp->decrypted_data, cc->key_size); | |
2521 | ||
2522 | return 0; | |
2523 | } | |
27f5411a | 2524 | |
363880c4 AF |
2525 | static int set_key_trusted(struct crypt_config *cc, struct key *key) |
2526 | { | |
2527 | const struct trusted_key_payload *tkp; | |
2528 | ||
2529 | tkp = key->payload.data[0]; | |
2530 | if (!tkp) | |
2531 | return -EKEYREVOKED; | |
2532 | ||
2533 | if (cc->key_size != tkp->key_len) | |
2534 | return -EINVAL; | |
2535 | ||
2536 | memcpy(cc->key, tkp->key, cc->key_size); | |
2537 | ||
2538 | return 0; | |
2539 | } | |
2540 | ||
c538f6ec OK |
2541 | static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) |
2542 | { | |
2543 | char *new_key_string, *key_desc; | |
2544 | int ret; | |
27f5411a | 2545 | struct key_type *type; |
c538f6ec | 2546 | struct key *key; |
27f5411a | 2547 | int (*set_key)(struct crypt_config *cc, struct key *key); |
c538f6ec | 2548 | |
027c431c OK |
2549 | /* |
2550 | * Reject key_string with whitespace. dm core currently lacks code for | |
2551 | * proper whitespace escaping in arguments on DM_TABLE_STATUS path. | |
2552 | */ | |
2553 | if (contains_whitespace(key_string)) { | |
2554 | DMERR("whitespace chars not allowed in key string"); | |
2555 | return -EINVAL; | |
2556 | } | |
2557 | ||
c538f6ec | 2558 | /* look for next ':' separating key_type from key_description */ |
fc772580 | 2559 | key_desc = strchr(key_string, ':'); |
c538f6ec OK |
2560 | if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) |
2561 | return -EINVAL; | |
2562 | ||
27f5411a DB |
2563 | if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) { |
2564 | type = &key_type_logon; | |
2565 | set_key = set_key_user; | |
2566 | } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) { | |
2567 | type = &key_type_user; | |
2568 | set_key = set_key_user; | |
831475cc AF |
2569 | } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) && |
2570 | !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) { | |
27f5411a DB |
2571 | type = &key_type_encrypted; |
2572 | set_key = set_key_encrypted; | |
363880c4 | 2573 | } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) && |
255e2646 | 2574 | !strncmp(key_string, "trusted:", key_desc - key_string + 1)) { |
363880c4 AF |
2575 | type = &key_type_trusted; |
2576 | set_key = set_key_trusted; | |
27f5411a | 2577 | } else { |
c538f6ec | 2578 | return -EINVAL; |
27f5411a | 2579 | } |
c538f6ec OK |
2580 | |
2581 | new_key_string = kstrdup(key_string, GFP_KERNEL); | |
2582 | if (!new_key_string) | |
2583 | return -ENOMEM; | |
2584 | ||
27f5411a | 2585 | key = request_key(type, key_desc + 1, NULL); |
c538f6ec | 2586 | if (IS_ERR(key)) { |
453431a5 | 2587 | kfree_sensitive(new_key_string); |
c538f6ec OK |
2588 | return PTR_ERR(key); |
2589 | } | |
2590 | ||
f5b0cba8 | 2591 | down_read(&key->sem); |
c538f6ec | 2592 | |
27f5411a DB |
2593 | ret = set_key(cc, key); |
2594 | if (ret < 0) { | |
f5b0cba8 | 2595 | up_read(&key->sem); |
c538f6ec | 2596 | key_put(key); |
453431a5 | 2597 | kfree_sensitive(new_key_string); |
27f5411a | 2598 | return ret; |
c538f6ec OK |
2599 | } |
2600 | ||
f5b0cba8 | 2601 | up_read(&key->sem); |
c538f6ec OK |
2602 | key_put(key); |
2603 | ||
2604 | /* clear the flag since following operations may invalidate previously valid key */ | |
2605 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
2606 | ||
2607 | ret = crypt_setkey(cc); | |
2608 | ||
c538f6ec OK |
2609 | if (!ret) { |
2610 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
453431a5 | 2611 | kfree_sensitive(cc->key_string); |
c538f6ec OK |
2612 | cc->key_string = new_key_string; |
2613 | } else | |
453431a5 | 2614 | kfree_sensitive(new_key_string); |
c538f6ec OK |
2615 | |
2616 | return ret; | |
2617 | } | |
2618 | ||
2619 | static int get_key_size(char **key_string) | |
2620 | { | |
2621 | char *colon, dummy; | |
2622 | int ret; | |
2623 | ||
2624 | if (*key_string[0] != ':') | |
2625 | return strlen(*key_string) >> 1; | |
2626 | ||
2627 | /* look for next ':' in key string */ | |
2628 | colon = strpbrk(*key_string + 1, ":"); | |
2629 | if (!colon) | |
2630 | return -EINVAL; | |
2631 | ||
2632 | if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') | |
2633 | return -EINVAL; | |
2634 | ||
2635 | *key_string = colon; | |
2636 | ||
2637 | /* remaining key string should be :<logon|user>:<key_desc> */ | |
2638 | ||
2639 | return ret; | |
2640 | } | |
2641 | ||
2642 | #else | |
2643 | ||
2644 | static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) | |
2645 | { | |
2646 | return -EINVAL; | |
2647 | } | |
2648 | ||
2649 | static int get_key_size(char **key_string) | |
2650 | { | |
6fc51504 | 2651 | return (*key_string[0] == ':') ? -EINVAL : (int)(strlen(*key_string) >> 1); |
c538f6ec OK |
2652 | } |
2653 | ||
27f5411a | 2654 | #endif /* CONFIG_KEYS */ |
c538f6ec | 2655 | |
e48d4bbf MB |
2656 | static int crypt_set_key(struct crypt_config *cc, char *key) |
2657 | { | |
de8be5ac MB |
2658 | int r = -EINVAL; |
2659 | int key_string_len = strlen(key); | |
2660 | ||
69a8cfcd MB |
2661 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
2662 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 2663 | goto out; |
e48d4bbf | 2664 | |
c538f6ec OK |
2665 | /* ':' means the key is in kernel keyring, short-circuit normal key processing */ |
2666 | if (key[0] == ':') { | |
2667 | r = crypt_set_keyring_key(cc, key + 1); | |
de8be5ac | 2668 | goto out; |
c538f6ec | 2669 | } |
e48d4bbf | 2670 | |
265e9098 OK |
2671 | /* clear the flag since following operations may invalidate previously valid key */ |
2672 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
e48d4bbf | 2673 | |
c538f6ec | 2674 | /* wipe references to any kernel keyring key */ |
453431a5 | 2675 | kfree_sensitive(cc->key_string); |
c538f6ec OK |
2676 | cc->key_string = NULL; |
2677 | ||
e944e03e AS |
2678 | /* Decode key from its hex representation. */ |
2679 | if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) | |
de8be5ac | 2680 | goto out; |
e48d4bbf | 2681 | |
671ea6b4 | 2682 | r = crypt_setkey(cc); |
265e9098 OK |
2683 | if (!r) |
2684 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
de8be5ac MB |
2685 | |
2686 | out: | |
2687 | /* Hex key string not needed after here, so wipe it. */ | |
2688 | memset(key, '0', key_string_len); | |
2689 | ||
2690 | return r; | |
e48d4bbf MB |
2691 | } |
2692 | ||
2693 | static int crypt_wipe_key(struct crypt_config *cc) | |
2694 | { | |
c82feeec OK |
2695 | int r; |
2696 | ||
e48d4bbf | 2697 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
c82feeec | 2698 | get_random_bytes(&cc->key, cc->key_size); |
4a52ffc7 MB |
2699 | |
2700 | /* Wipe IV private keys */ | |
2701 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { | |
2702 | r = cc->iv_gen_ops->wipe(cc); | |
2703 | if (r) | |
2704 | return r; | |
2705 | } | |
2706 | ||
453431a5 | 2707 | kfree_sensitive(cc->key_string); |
c538f6ec | 2708 | cc->key_string = NULL; |
c82feeec OK |
2709 | r = crypt_setkey(cc); |
2710 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 | 2711 | |
c82feeec | 2712 | return r; |
e48d4bbf MB |
2713 | } |
2714 | ||
5059353d MP |
2715 | static void crypt_calculate_pages_per_client(void) |
2716 | { | |
ca79b0c2 | 2717 | unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; |
5059353d MP |
2718 | |
2719 | if (!dm_crypt_clients_n) | |
2720 | return; | |
2721 | ||
2722 | pages /= dm_crypt_clients_n; | |
2723 | if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) | |
2724 | pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; | |
2725 | dm_crypt_pages_per_client = pages; | |
2726 | } | |
2727 | ||
2728 | static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) | |
2729 | { | |
2730 | struct crypt_config *cc = pool_data; | |
2731 | struct page *page; | |
2732 | ||
528b16bf AW |
2733 | /* |
2734 | * Note, percpu_counter_read_positive() may over (and under) estimate | |
2735 | * the current usage by at most (batch - 1) * num_online_cpus() pages, | |
2736 | * but avoids potential spinlock contention of an exact result. | |
2737 | */ | |
2738 | if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) >= dm_crypt_pages_per_client) && | |
5059353d MP |
2739 | likely(gfp_mask & __GFP_NORETRY)) |
2740 | return NULL; | |
2741 | ||
2742 | page = alloc_page(gfp_mask); | |
2743 | if (likely(page != NULL)) | |
2744 | percpu_counter_add(&cc->n_allocated_pages, 1); | |
2745 | ||
2746 | return page; | |
2747 | } | |
2748 | ||
2749 | static void crypt_page_free(void *page, void *pool_data) | |
2750 | { | |
2751 | struct crypt_config *cc = pool_data; | |
2752 | ||
2753 | __free_page(page); | |
2754 | percpu_counter_sub(&cc->n_allocated_pages, 1); | |
2755 | } | |
2756 | ||
28513fcc MB |
2757 | static void crypt_dtr(struct dm_target *ti) |
2758 | { | |
2759 | struct crypt_config *cc = ti->private; | |
2760 | ||
2761 | ti->private = NULL; | |
2762 | ||
2763 | if (!cc) | |
2764 | return; | |
2765 | ||
f659b100 | 2766 | if (cc->write_thread) |
dc267621 MP |
2767 | kthread_stop(cc->write_thread); |
2768 | ||
28513fcc MB |
2769 | if (cc->io_queue) |
2770 | destroy_workqueue(cc->io_queue); | |
2771 | if (cc->crypt_queue) | |
2772 | destroy_workqueue(cc->crypt_queue); | |
2773 | ||
fd2d231f MP |
2774 | crypt_free_tfms(cc); |
2775 | ||
6f1c819c | 2776 | bioset_exit(&cc->bs); |
28513fcc | 2777 | |
6f1c819c KO |
2778 | mempool_exit(&cc->page_pool); |
2779 | mempool_exit(&cc->req_pool); | |
2780 | mempool_exit(&cc->tag_pool); | |
2781 | ||
d00a11df KO |
2782 | WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); |
2783 | percpu_counter_destroy(&cc->n_allocated_pages); | |
2784 | ||
28513fcc MB |
2785 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
2786 | cc->iv_gen_ops->dtr(cc); | |
2787 | ||
28513fcc MB |
2788 | if (cc->dev) |
2789 | dm_put_device(ti, cc->dev); | |
2790 | ||
453431a5 WL |
2791 | kfree_sensitive(cc->cipher_string); |
2792 | kfree_sensitive(cc->key_string); | |
2793 | kfree_sensitive(cc->cipher_auth); | |
2794 | kfree_sensitive(cc->authenc_key); | |
28513fcc | 2795 | |
d5ffebdd MS |
2796 | mutex_destroy(&cc->bio_alloc_lock); |
2797 | ||
28513fcc | 2798 | /* Must zero key material before freeing */ |
453431a5 | 2799 | kfree_sensitive(cc); |
5059353d MP |
2800 | |
2801 | spin_lock(&dm_crypt_clients_lock); | |
2802 | WARN_ON(!dm_crypt_clients_n); | |
2803 | dm_crypt_clients_n--; | |
2804 | crypt_calculate_pages_per_client(); | |
2805 | spin_unlock(&dm_crypt_clients_lock); | |
58d0f180 MW |
2806 | |
2807 | dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); | |
28513fcc MB |
2808 | } |
2809 | ||
e889f97a MB |
2810 | static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) |
2811 | { | |
2812 | struct crypt_config *cc = ti->private; | |
2813 | ||
33d2f09f | 2814 | if (crypt_integrity_aead(cc)) |
e889f97a MB |
2815 | cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); |
2816 | else | |
2817 | cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); | |
2818 | ||
e889f97a MB |
2819 | if (cc->iv_size) |
2820 | /* at least a 64 bit sector number should fit in our buffer */ | |
2821 | cc->iv_size = max(cc->iv_size, | |
2822 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
2823 | else if (ivmode) { | |
2824 | DMWARN("Selected cipher does not support IVs"); | |
2825 | ivmode = NULL; | |
2826 | } | |
2827 | ||
2828 | /* Choose ivmode, see comments at iv code. */ | |
2829 | if (ivmode == NULL) | |
2830 | cc->iv_gen_ops = NULL; | |
2831 | else if (strcmp(ivmode, "plain") == 0) | |
2832 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
2833 | else if (strcmp(ivmode, "plain64") == 0) | |
2834 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
7e3fd855 MB |
2835 | else if (strcmp(ivmode, "plain64be") == 0) |
2836 | cc->iv_gen_ops = &crypt_iv_plain64be_ops; | |
e889f97a MB |
2837 | else if (strcmp(ivmode, "essiv") == 0) |
2838 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
2839 | else if (strcmp(ivmode, "benbi") == 0) | |
2840 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
2841 | else if (strcmp(ivmode, "null") == 0) | |
2842 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
b9411d73 MB |
2843 | else if (strcmp(ivmode, "eboiv") == 0) |
2844 | cc->iv_gen_ops = &crypt_iv_eboiv_ops; | |
bbb16584 MB |
2845 | else if (strcmp(ivmode, "elephant") == 0) { |
2846 | cc->iv_gen_ops = &crypt_iv_elephant_ops; | |
2847 | cc->key_parts = 2; | |
2848 | cc->key_extra_size = cc->key_size / 2; | |
2849 | if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) | |
2850 | return -EINVAL; | |
2851 | set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); | |
2852 | } else if (strcmp(ivmode, "lmk") == 0) { | |
e889f97a MB |
2853 | cc->iv_gen_ops = &crypt_iv_lmk_ops; |
2854 | /* | |
2855 | * Version 2 and 3 is recognised according | |
2856 | * to length of provided multi-key string. | |
2857 | * If present (version 3), last key is used as IV seed. | |
2858 | * All keys (including IV seed) are always the same size. | |
2859 | */ | |
2860 | if (cc->key_size % cc->key_parts) { | |
2861 | cc->key_parts++; | |
2862 | cc->key_extra_size = cc->key_size / cc->key_parts; | |
2863 | } | |
2864 | } else if (strcmp(ivmode, "tcw") == 0) { | |
2865 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
2866 | cc->key_parts += 2; /* IV + whitening */ | |
2867 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
2868 | } else if (strcmp(ivmode, "random") == 0) { | |
2869 | cc->iv_gen_ops = &crypt_iv_random_ops; | |
2870 | /* Need storage space in integrity fields. */ | |
2871 | cc->integrity_iv_size = cc->iv_size; | |
2872 | } else { | |
2873 | ti->error = "Invalid IV mode"; | |
2874 | return -EINVAL; | |
2875 | } | |
2876 | ||
2877 | return 0; | |
2878 | } | |
2879 | ||
33d2f09f MB |
2880 | /* |
2881 | * Workaround to parse HMAC algorithm from AEAD crypto API spec. | |
2882 | * The HMAC is needed to calculate tag size (HMAC digest size). | |
2883 | * This should be probably done by crypto-api calls (once available...) | |
2884 | */ | |
2885 | static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) | |
2886 | { | |
2887 | char *start, *end, *mac_alg = NULL; | |
2888 | struct crypto_ahash *mac; | |
2889 | ||
2890 | if (!strstarts(cipher_api, "authenc(")) | |
2891 | return 0; | |
2892 | ||
2893 | start = strchr(cipher_api, '('); | |
2894 | end = strchr(cipher_api, ','); | |
2895 | if (!start || !end || ++start > end) | |
2896 | return -EINVAL; | |
2897 | ||
e9d7bd2c | 2898 | mac_alg = kmemdup_nul(start, end - start, GFP_KERNEL); |
33d2f09f MB |
2899 | if (!mac_alg) |
2900 | return -ENOMEM; | |
33d2f09f | 2901 | |
cd746938 | 2902 | mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY); |
33d2f09f MB |
2903 | kfree(mac_alg); |
2904 | ||
2905 | if (IS_ERR(mac)) | |
2906 | return PTR_ERR(mac); | |
2907 | ||
2908 | cc->key_mac_size = crypto_ahash_digestsize(mac); | |
2909 | crypto_free_ahash(mac); | |
2910 | ||
2911 | cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); | |
2912 | if (!cc->authenc_key) | |
2913 | return -ENOMEM; | |
2914 | ||
2915 | return 0; | |
2916 | } | |
2917 | ||
2918 | static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, | |
2919 | char **ivmode, char **ivopts) | |
2920 | { | |
2921 | struct crypt_config *cc = ti->private; | |
a1a262b6 | 2922 | char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; |
33d2f09f MB |
2923 | int ret = -EINVAL; |
2924 | ||
2925 | cc->tfms_count = 1; | |
2926 | ||
2927 | /* | |
2928 | * New format (capi: prefix) | |
2929 | * capi:cipher_api_spec-iv:ivopts | |
2930 | */ | |
2931 | tmp = &cipher_in[strlen("capi:")]; | |
1856b9f7 MB |
2932 | |
2933 | /* Separate IV options if present, it can contain another '-' in hash name */ | |
2934 | *ivopts = strrchr(tmp, ':'); | |
2935 | if (*ivopts) { | |
2936 | **ivopts = '\0'; | |
2937 | (*ivopts)++; | |
2938 | } | |
2939 | /* Parse IV mode */ | |
2940 | *ivmode = strrchr(tmp, '-'); | |
2941 | if (*ivmode) { | |
2942 | **ivmode = '\0'; | |
2943 | (*ivmode)++; | |
2944 | } | |
2945 | /* The rest is crypto API spec */ | |
2946 | cipher_api = tmp; | |
33d2f09f | 2947 | |
a1a262b6 AB |
2948 | /* Alloc AEAD, can be used only in new format. */ |
2949 | if (crypt_integrity_aead(cc)) { | |
2950 | ret = crypt_ctr_auth_cipher(cc, cipher_api); | |
2951 | if (ret < 0) { | |
2952 | ti->error = "Invalid AEAD cipher spec"; | |
2a32897c | 2953 | return ret; |
a1a262b6 AB |
2954 | } |
2955 | } | |
2956 | ||
33d2f09f MB |
2957 | if (*ivmode && !strcmp(*ivmode, "lmk")) |
2958 | cc->tfms_count = 64; | |
2959 | ||
a1a262b6 AB |
2960 | if (*ivmode && !strcmp(*ivmode, "essiv")) { |
2961 | if (!*ivopts) { | |
2962 | ti->error = "Digest algorithm missing for ESSIV mode"; | |
2963 | return -EINVAL; | |
2964 | } | |
2965 | ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", | |
2966 | cipher_api, *ivopts); | |
2967 | if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { | |
2968 | ti->error = "Cannot allocate cipher string"; | |
2969 | return -ENOMEM; | |
2970 | } | |
2971 | cipher_api = buf; | |
2972 | } | |
2973 | ||
33d2f09f MB |
2974 | cc->key_parts = cc->tfms_count; |
2975 | ||
2976 | /* Allocate cipher */ | |
2977 | ret = crypt_alloc_tfms(cc, cipher_api); | |
2978 | if (ret < 0) { | |
2979 | ti->error = "Error allocating crypto tfm"; | |
2980 | return ret; | |
2981 | } | |
2982 | ||
a1a262b6 | 2983 | if (crypt_integrity_aead(cc)) |
33d2f09f | 2984 | cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); |
a1a262b6 | 2985 | else |
33d2f09f MB |
2986 | cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); |
2987 | ||
33d2f09f MB |
2988 | return 0; |
2989 | } | |
2990 | ||
2991 | static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, | |
2992 | char **ivmode, char **ivopts) | |
1da177e4 | 2993 | { |
5ebaee6d | 2994 | struct crypt_config *cc = ti->private; |
33d2f09f | 2995 | char *tmp, *cipher, *chainmode, *keycount; |
5ebaee6d | 2996 | char *cipher_api = NULL; |
fd2d231f | 2997 | int ret = -EINVAL; |
31998ef1 | 2998 | char dummy; |
1da177e4 | 2999 | |
33d2f09f | 3000 | if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { |
5ebaee6d | 3001 | ti->error = "Bad cipher specification"; |
1da177e4 LT |
3002 | return -EINVAL; |
3003 | } | |
3004 | ||
5ebaee6d MB |
3005 | /* |
3006 | * Legacy dm-crypt cipher specification | |
d1f96423 | 3007 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
3008 | */ |
3009 | tmp = cipher_in; | |
d1f96423 MB |
3010 | keycount = strsep(&tmp, "-"); |
3011 | cipher = strsep(&keycount, ":"); | |
3012 | ||
3013 | if (!keycount) | |
3014 | cc->tfms_count = 1; | |
31998ef1 | 3015 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
3016 | !is_power_of_2(cc->tfms_count)) { |
3017 | ti->error = "Bad cipher key count specification"; | |
3018 | return -EINVAL; | |
3019 | } | |
3020 | cc->key_parts = cc->tfms_count; | |
5ebaee6d | 3021 | |
1da177e4 | 3022 | chainmode = strsep(&tmp, "-"); |
1856b9f7 MB |
3023 | *ivmode = strsep(&tmp, ":"); |
3024 | *ivopts = tmp; | |
1da177e4 | 3025 | |
7dbcd137 MB |
3026 | /* |
3027 | * For compatibility with the original dm-crypt mapping format, if | |
3028 | * only the cipher name is supplied, use cbc-plain. | |
3029 | */ | |
33d2f09f | 3030 | if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { |
1da177e4 | 3031 | chainmode = "cbc"; |
33d2f09f | 3032 | *ivmode = "plain"; |
1da177e4 LT |
3033 | } |
3034 | ||
33d2f09f | 3035 | if (strcmp(chainmode, "ecb") && !*ivmode) { |
5ebaee6d MB |
3036 | ti->error = "IV mechanism required"; |
3037 | return -EINVAL; | |
1da177e4 LT |
3038 | } |
3039 | ||
5ebaee6d MB |
3040 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
3041 | if (!cipher_api) | |
3042 | goto bad_mem; | |
3043 | ||
a1a262b6 AB |
3044 | if (*ivmode && !strcmp(*ivmode, "essiv")) { |
3045 | if (!*ivopts) { | |
3046 | ti->error = "Digest algorithm missing for ESSIV mode"; | |
3047 | kfree(cipher_api); | |
3048 | return -EINVAL; | |
3049 | } | |
3050 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
3051 | "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); | |
3052 | } else { | |
3053 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
3054 | "%s(%s)", chainmode, cipher); | |
3055 | } | |
3056 | if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { | |
5ebaee6d MB |
3057 | kfree(cipher_api); |
3058 | goto bad_mem; | |
1da177e4 LT |
3059 | } |
3060 | ||
5ebaee6d | 3061 | /* Allocate cipher */ |
fd2d231f MP |
3062 | ret = crypt_alloc_tfms(cc, cipher_api); |
3063 | if (ret < 0) { | |
3064 | ti->error = "Error allocating crypto tfm"; | |
33d2f09f MB |
3065 | kfree(cipher_api); |
3066 | return ret; | |
1da177e4 | 3067 | } |
bd86e320 | 3068 | kfree(cipher_api); |
1da177e4 | 3069 | |
33d2f09f MB |
3070 | return 0; |
3071 | bad_mem: | |
3072 | ti->error = "Cannot allocate cipher strings"; | |
3073 | return -ENOMEM; | |
3074 | } | |
5ebaee6d | 3075 | |
33d2f09f MB |
3076 | static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) |
3077 | { | |
3078 | struct crypt_config *cc = ti->private; | |
3079 | char *ivmode = NULL, *ivopts = NULL; | |
3080 | int ret; | |
3081 | ||
3082 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); | |
3083 | if (!cc->cipher_string) { | |
3084 | ti->error = "Cannot allocate cipher strings"; | |
3085 | return -ENOMEM; | |
1da177e4 LT |
3086 | } |
3087 | ||
33d2f09f MB |
3088 | if (strstarts(cipher_in, "capi:")) |
3089 | ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); | |
3090 | else | |
3091 | ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); | |
3092 | if (ret) | |
3093 | return ret; | |
3094 | ||
5ebaee6d | 3095 | /* Initialize IV */ |
e889f97a MB |
3096 | ret = crypt_ctr_ivmode(ti, ivmode); |
3097 | if (ret < 0) | |
33d2f09f | 3098 | return ret; |
1da177e4 | 3099 | |
da31a078 MB |
3100 | /* Initialize and set key */ |
3101 | ret = crypt_set_key(cc, key); | |
3102 | if (ret < 0) { | |
3103 | ti->error = "Error decoding and setting key"; | |
33d2f09f | 3104 | return ret; |
da31a078 MB |
3105 | } |
3106 | ||
28513fcc MB |
3107 | /* Allocate IV */ |
3108 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
3109 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
3110 | if (ret < 0) { | |
3111 | ti->error = "Error creating IV"; | |
33d2f09f | 3112 | return ret; |
28513fcc MB |
3113 | } |
3114 | } | |
1da177e4 | 3115 | |
28513fcc MB |
3116 | /* Initialize IV (set keys for ESSIV etc) */ |
3117 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
3118 | ret = cc->iv_gen_ops->init(cc); | |
3119 | if (ret < 0) { | |
3120 | ti->error = "Error initialising IV"; | |
33d2f09f | 3121 | return ret; |
28513fcc | 3122 | } |
b95bf2d3 MB |
3123 | } |
3124 | ||
dc94902b OK |
3125 | /* wipe the kernel key payload copy */ |
3126 | if (cc->key_string) | |
3127 | memset(cc->key, 0, cc->key_size * sizeof(u8)); | |
3128 | ||
5ebaee6d | 3129 | return ret; |
5ebaee6d | 3130 | } |
5ebaee6d | 3131 | |
ef43aa38 MB |
3132 | static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) |
3133 | { | |
3134 | struct crypt_config *cc = ti->private; | |
3135 | struct dm_arg_set as; | |
5916a22b | 3136 | static const struct dm_arg _args[] = { |
39d42fa9 | 3137 | {0, 8, "Invalid number of feature args"}, |
ef43aa38 MB |
3138 | }; |
3139 | unsigned int opt_params, val; | |
3140 | const char *opt_string, *sval; | |
8f0009a2 | 3141 | char dummy; |
ef43aa38 MB |
3142 | int ret; |
3143 | ||
3144 | /* Optional parameters */ | |
3145 | as.argc = argc; | |
3146 | as.argv = argv; | |
3147 | ||
3148 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
3149 | if (ret) | |
3150 | return ret; | |
3151 | ||
3152 | while (opt_params--) { | |
3153 | opt_string = dm_shift_arg(&as); | |
3154 | if (!opt_string) { | |
3155 | ti->error = "Not enough feature arguments"; | |
3156 | return -EINVAL; | |
3157 | } | |
3158 | ||
3159 | if (!strcasecmp(opt_string, "allow_discards")) | |
3160 | ti->num_discard_bios = 1; | |
3161 | ||
3162 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
3163 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
3164 | ||
3165 | else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) | |
3166 | set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); | |
39d42fa9 IK |
3167 | else if (!strcasecmp(opt_string, "no_read_workqueue")) |
3168 | set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); | |
3169 | else if (!strcasecmp(opt_string, "no_write_workqueue")) | |
3170 | set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); | |
ef43aa38 MB |
3171 | else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { |
3172 | if (val == 0 || val > MAX_TAG_SIZE) { | |
3173 | ti->error = "Invalid integrity arguments"; | |
3174 | return -EINVAL; | |
3175 | } | |
3176 | cc->on_disk_tag_size = val; | |
3177 | sval = strchr(opt_string + strlen("integrity:"), ':') + 1; | |
3178 | if (!strcasecmp(sval, "aead")) { | |
3179 | set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); | |
42e15d12 | 3180 | } else if (strcasecmp(sval, "none")) { |
ef43aa38 MB |
3181 | ti->error = "Unknown integrity profile"; |
3182 | return -EINVAL; | |
3183 | } | |
3184 | ||
3185 | cc->cipher_auth = kstrdup(sval, GFP_KERNEL); | |
3186 | if (!cc->cipher_auth) | |
3187 | return -ENOMEM; | |
ff3af92b | 3188 | } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { |
8f0009a2 MB |
3189 | if (cc->sector_size < (1 << SECTOR_SHIFT) || |
3190 | cc->sector_size > 4096 || | |
ff3af92b | 3191 | (cc->sector_size & (cc->sector_size - 1))) { |
8f0009a2 MB |
3192 | ti->error = "Invalid feature value for sector_size"; |
3193 | return -EINVAL; | |
3194 | } | |
783874b0 MB |
3195 | if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { |
3196 | ti->error = "Device size is not multiple of sector_size feature"; | |
3197 | return -EINVAL; | |
3198 | } | |
ff3af92b | 3199 | cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; |
8f0009a2 MB |
3200 | } else if (!strcasecmp(opt_string, "iv_large_sectors")) |
3201 | set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); | |
3202 | else { | |
ef43aa38 MB |
3203 | ti->error = "Invalid feature arguments"; |
3204 | return -EINVAL; | |
3205 | } | |
3206 | } | |
3207 | ||
3208 | return 0; | |
5ebaee6d MB |
3209 | } |
3210 | ||
8e225f04 | 3211 | #ifdef CONFIG_BLK_DEV_ZONED |
8e225f04 DLM |
3212 | static int crypt_report_zones(struct dm_target *ti, |
3213 | struct dm_report_zones_args *args, unsigned int nr_zones) | |
3214 | { | |
3215 | struct crypt_config *cc = ti->private; | |
8e225f04 | 3216 | |
912e8875 DLM |
3217 | return dm_report_zones(cc->dev->bdev, cc->start, |
3218 | cc->start + dm_target_offset(ti, args->next_sector), | |
3219 | args, nr_zones); | |
8e225f04 | 3220 | } |
e3290b94 MS |
3221 | #else |
3222 | #define crypt_report_zones NULL | |
8e225f04 DLM |
3223 | #endif |
3224 | ||
5ebaee6d MB |
3225 | /* |
3226 | * Construct an encryption mapping: | |
c538f6ec | 3227 | * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> |
5ebaee6d MB |
3228 | */ |
3229 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
3230 | { | |
3231 | struct crypt_config *cc; | |
ed0302e8 | 3232 | const char *devname = dm_table_device_name(ti->table); |
c538f6ec | 3233 | int key_size; |
ef43aa38 | 3234 | unsigned int align_mask; |
5ebaee6d MB |
3235 | unsigned long long tmpll; |
3236 | int ret; | |
ef43aa38 | 3237 | size_t iv_size_padding, additional_req_size; |
31998ef1 | 3238 | char dummy; |
772ae5f5 | 3239 | |
772ae5f5 | 3240 | if (argc < 5) { |
5ebaee6d MB |
3241 | ti->error = "Not enough arguments"; |
3242 | return -EINVAL; | |
1da177e4 LT |
3243 | } |
3244 | ||
c538f6ec OK |
3245 | key_size = get_key_size(&argv[1]); |
3246 | if (key_size < 0) { | |
3247 | ti->error = "Cannot parse key size"; | |
3248 | return -EINVAL; | |
3249 | } | |
5ebaee6d | 3250 | |
9c81c99b | 3251 | cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL); |
5ebaee6d MB |
3252 | if (!cc) { |
3253 | ti->error = "Cannot allocate encryption context"; | |
3254 | return -ENOMEM; | |
3255 | } | |
69a8cfcd | 3256 | cc->key_size = key_size; |
8f0009a2 | 3257 | cc->sector_size = (1 << SECTOR_SHIFT); |
ff3af92b | 3258 | cc->sector_shift = 0; |
5ebaee6d MB |
3259 | |
3260 | ti->private = cc; | |
ef43aa38 | 3261 | |
5059353d MP |
3262 | spin_lock(&dm_crypt_clients_lock); |
3263 | dm_crypt_clients_n++; | |
3264 | crypt_calculate_pages_per_client(); | |
3265 | spin_unlock(&dm_crypt_clients_lock); | |
3266 | ||
3267 | ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); | |
3268 | if (ret < 0) | |
3269 | goto bad; | |
3270 | ||
ef43aa38 MB |
3271 | /* Optional parameters need to be read before cipher constructor */ |
3272 | if (argc > 5) { | |
3273 | ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); | |
3274 | if (ret) | |
3275 | goto bad; | |
3276 | } | |
3277 | ||
5ebaee6d MB |
3278 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); |
3279 | if (ret < 0) | |
3280 | goto bad; | |
3281 | ||
33d2f09f | 3282 | if (crypt_integrity_aead(cc)) { |
ef43aa38 MB |
3283 | cc->dmreq_start = sizeof(struct aead_request); |
3284 | cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); | |
3285 | align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); | |
3286 | } else { | |
3287 | cc->dmreq_start = sizeof(struct skcipher_request); | |
3288 | cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); | |
3289 | align_mask = crypto_skcipher_alignmask(any_tfm(cc)); | |
3290 | } | |
d49ec52f MP |
3291 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
3292 | ||
ef43aa38 | 3293 | if (align_mask < CRYPTO_MINALIGN) { |
d49ec52f MP |
3294 | /* Allocate the padding exactly */ |
3295 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
ef43aa38 | 3296 | & align_mask; |
d49ec52f MP |
3297 | } else { |
3298 | /* | |
3299 | * If the cipher requires greater alignment than kmalloc | |
3300 | * alignment, we don't know the exact position of the | |
3301 | * initialization vector. We must assume worst case. | |
3302 | */ | |
ef43aa38 | 3303 | iv_size_padding = align_mask; |
d49ec52f | 3304 | } |
ddd42edf | 3305 | |
ef43aa38 MB |
3306 | /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ |
3307 | additional_req_size = sizeof(struct dm_crypt_request) + | |
3308 | iv_size_padding + cc->iv_size + | |
3309 | cc->iv_size + | |
3310 | sizeof(uint64_t) + | |
3311 | sizeof(unsigned int); | |
3312 | ||
6f1c819c KO |
3313 | ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); |
3314 | if (ret) { | |
ddd42edf | 3315 | ti->error = "Cannot allocate crypt request mempool"; |
28513fcc | 3316 | goto bad; |
ddd42edf | 3317 | } |
ddd42edf | 3318 | |
30187e1d | 3319 | cc->per_bio_data_size = ti->per_io_data_size = |
ef43aa38 | 3320 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, |
7bc75714 | 3321 | ARCH_DMA_MINALIGN); |
298a9fa0 | 3322 | |
a8affc03 | 3323 | ret = mempool_init(&cc->page_pool, BIO_MAX_VECS, crypt_page_alloc, crypt_page_free, cc); |
6f1c819c | 3324 | if (ret) { |
72d94861 | 3325 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 3326 | goto bad; |
1da177e4 LT |
3327 | } |
3328 | ||
6f1c819c KO |
3329 | ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); |
3330 | if (ret) { | |
6a24c718 | 3331 | ti->error = "Cannot allocate crypt bioset"; |
28513fcc | 3332 | goto bad; |
6a24c718 MB |
3333 | } |
3334 | ||
7145c241 MP |
3335 | mutex_init(&cc->bio_alloc_lock); |
3336 | ||
28513fcc | 3337 | ret = -EINVAL; |
8f0009a2 MB |
3338 | if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || |
3339 | (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { | |
72d94861 | 3340 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 3341 | goto bad; |
1da177e4 | 3342 | } |
4ee218cd | 3343 | cc->iv_offset = tmpll; |
1da177e4 | 3344 | |
e80d1c80 VG |
3345 | ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); |
3346 | if (ret) { | |
28513fcc MB |
3347 | ti->error = "Device lookup failed"; |
3348 | goto bad; | |
3349 | } | |
3350 | ||
e80d1c80 | 3351 | ret = -EINVAL; |
ef87bfc2 | 3352 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { |
72d94861 | 3353 | ti->error = "Invalid device sector"; |
28513fcc | 3354 | goto bad; |
1da177e4 | 3355 | } |
4ee218cd | 3356 | cc->start = tmpll; |
1da177e4 | 3357 | |
8e225f04 | 3358 | if (bdev_is_zoned(cc->dev->bdev)) { |
f34ee1dc DLM |
3359 | /* |
3360 | * For zoned block devices, we need to preserve the issuer write | |
3361 | * ordering. To do so, disable write workqueues and force inline | |
3362 | * encryption completion. | |
3363 | */ | |
8e225f04 DLM |
3364 | set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); |
3365 | set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); | |
f34ee1dc DLM |
3366 | |
3367 | /* | |
3368 | * All zone append writes to a zone of a zoned block device will | |
3369 | * have the same BIO sector, the start of the zone. When the | |
3370 | * cypher IV mode uses sector values, all data targeting a | |
3371 | * zone will be encrypted using the first sector numbers of the | |
3372 | * zone. This will not result in write errors but will | |
3373 | * cause most reads to fail as reads will use the sector values | |
3374 | * for the actual data locations, resulting in IV mismatch. | |
3375 | * To avoid this problem, ask DM core to emulate zone append | |
3376 | * operations with regular writes. | |
3377 | */ | |
3378 | DMDEBUG("Zone append operations will be emulated"); | |
3379 | ti->emulate_zone_append = true; | |
8e225f04 DLM |
3380 | } |
3381 | ||
33d2f09f | 3382 | if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { |
ef43aa38 | 3383 | ret = crypt_integrity_ctr(cc, ti); |
772ae5f5 MB |
3384 | if (ret) |
3385 | goto bad; | |
3386 | ||
ef43aa38 MB |
3387 | cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; |
3388 | if (!cc->tag_pool_max_sectors) | |
3389 | cc->tag_pool_max_sectors = 1; | |
f3396c58 | 3390 | |
6f1c819c | 3391 | ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, |
ef43aa38 | 3392 | cc->tag_pool_max_sectors * cc->on_disk_tag_size); |
6f1c819c | 3393 | if (ret) { |
ef43aa38 MB |
3394 | ti->error = "Cannot allocate integrity tags mempool"; |
3395 | goto bad; | |
772ae5f5 | 3396 | } |
583fe747 MP |
3397 | |
3398 | cc->tag_pool_max_sectors <<= cc->sector_shift; | |
772ae5f5 MB |
3399 | } |
3400 | ||
28513fcc | 3401 | ret = -ENOMEM; |
f612b213 | 3402 | cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname); |
cabf08e4 MB |
3403 | if (!cc->io_queue) { |
3404 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 3405 | goto bad; |
cabf08e4 MB |
3406 | } |
3407 | ||
f3396c58 | 3408 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
48b0777c | 3409 | cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, |
ed0302e8 | 3410 | 1, devname); |
f3396c58 | 3411 | else |
48b0777c MS |
3412 | cc->crypt_queue = alloc_workqueue("kcryptd/%s", |
3413 | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
ed0302e8 | 3414 | num_online_cpus(), devname); |
cabf08e4 | 3415 | if (!cc->crypt_queue) { |
9934a8be | 3416 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 3417 | goto bad; |
9934a8be MB |
3418 | } |
3419 | ||
c7329eff | 3420 | spin_lock_init(&cc->write_thread_lock); |
b3c5fd30 | 3421 | cc->write_tree = RB_ROOT; |
dc267621 | 3422 | |
a5217c11 | 3423 | cc->write_thread = kthread_run(dmcrypt_write, cc, "dmcrypt_write/%s", devname); |
dc267621 MP |
3424 | if (IS_ERR(cc->write_thread)) { |
3425 | ret = PTR_ERR(cc->write_thread); | |
3426 | cc->write_thread = NULL; | |
3427 | ti->error = "Couldn't spawn write thread"; | |
3428 | goto bad; | |
3429 | } | |
dc267621 | 3430 | |
55a62eef | 3431 | ti->num_flush_bios = 1; |
a666e5c0 | 3432 | ti->limit_swap_bios = true; |
e5524e12 | 3433 | ti->accounts_remapped_io = true; |
983c7db3 | 3434 | |
58d0f180 | 3435 | dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); |
1da177e4 LT |
3436 | return 0; |
3437 | ||
28513fcc | 3438 | bad: |
58d0f180 | 3439 | dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); |
28513fcc MB |
3440 | crypt_dtr(ti); |
3441 | return ret; | |
1da177e4 LT |
3442 | } |
3443 | ||
7de3ee57 | 3444 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 3445 | { |
028867ac | 3446 | struct dm_crypt_io *io; |
49a8a920 | 3447 | struct crypt_config *cc = ti->private; |
647c7db1 | 3448 | |
772ae5f5 | 3449 | /* |
28a8f0d3 MC |
3450 | * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. |
3451 | * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight | |
e6047149 | 3452 | * - for REQ_OP_DISCARD caller must use flush if IO ordering matters |
772ae5f5 | 3453 | */ |
1eff9d32 | 3454 | if (unlikely(bio->bi_opf & REQ_PREFLUSH || |
28a8f0d3 | 3455 | bio_op(bio) == REQ_OP_DISCARD)) { |
74d46992 | 3456 | bio_set_dev(bio, cc->dev->bdev); |
772ae5f5 | 3457 | if (bio_sectors(bio)) |
4f024f37 KO |
3458 | bio->bi_iter.bi_sector = cc->start + |
3459 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
3460 | return DM_MAPIO_REMAPPED; |
3461 | } | |
1da177e4 | 3462 | |
4e870e94 MP |
3463 | /* |
3464 | * Check if bio is too large, split as needed. | |
3465 | */ | |
a8affc03 | 3466 | if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_VECS << PAGE_SHIFT)) && |
ef43aa38 | 3467 | (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) |
a8affc03 | 3468 | dm_accept_partial_bio(bio, ((BIO_MAX_VECS << PAGE_SHIFT) >> SECTOR_SHIFT)); |
4e870e94 | 3469 | |
8f0009a2 MB |
3470 | /* |
3471 | * Ensure that bio is a multiple of internal sector encryption size | |
3472 | * and is aligned to this size as defined in IO hints. | |
3473 | */ | |
3474 | if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) | |
846785e6 | 3475 | return DM_MAPIO_KILL; |
8f0009a2 MB |
3476 | |
3477 | if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) | |
846785e6 | 3478 | return DM_MAPIO_KILL; |
8f0009a2 | 3479 | |
298a9fa0 MP |
3480 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
3481 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
ef43aa38 MB |
3482 | |
3483 | if (cc->on_disk_tag_size) { | |
86a3238c | 3484 | unsigned int tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); |
ef43aa38 | 3485 | |
d715fa23 HM |
3486 | if (unlikely(tag_len > KMALLOC_MAX_SIZE)) |
3487 | io->integrity_metadata = NULL; | |
3488 | else | |
3489 | io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); | |
ef43aa38 | 3490 | |
d715fa23 | 3491 | if (unlikely(!io->integrity_metadata)) { |
ef43aa38 MB |
3492 | if (bio_sectors(bio) > cc->tag_pool_max_sectors) |
3493 | dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); | |
6f1c819c | 3494 | io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); |
ef43aa38 MB |
3495 | io->integrity_metadata_from_pool = true; |
3496 | } | |
3497 | } | |
3498 | ||
33d2f09f | 3499 | if (crypt_integrity_aead(cc)) |
ef43aa38 MB |
3500 | io->ctx.r.req_aead = (struct aead_request *)(io + 1); |
3501 | else | |
3502 | io->ctx.r.req = (struct skcipher_request *)(io + 1); | |
cabf08e4 | 3503 | |
20c82538 | 3504 | if (bio_data_dir(io->base_bio) == READ) { |
e5524e12 | 3505 | if (kcryptd_io_read(io, CRYPT_MAP_READ_GFP)) |
dc267621 | 3506 | kcryptd_queue_read(io); |
20c82538 | 3507 | } else |
cabf08e4 | 3508 | kcryptd_queue_crypt(io); |
1da177e4 | 3509 | |
d2a7ad29 | 3510 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
3511 | } |
3512 | ||
567dd8f3 MP |
3513 | static char hex2asc(unsigned char c) |
3514 | { | |
86a3238c | 3515 | return c + '0' + ((unsigned int)(9 - c) >> 4 & 0x27); |
567dd8f3 MP |
3516 | } |
3517 | ||
fd7c092e | 3518 | static void crypt_status(struct dm_target *ti, status_type_t type, |
86a3238c | 3519 | unsigned int status_flags, char *result, unsigned int maxlen) |
1da177e4 | 3520 | { |
5ebaee6d | 3521 | struct crypt_config *cc = ti->private; |
86a3238c | 3522 | unsigned int i, sz = 0; |
f3396c58 | 3523 | int num_feature_args = 0; |
1da177e4 LT |
3524 | |
3525 | switch (type) { | |
3526 | case STATUSTYPE_INFO: | |
3527 | result[0] = '\0'; | |
3528 | break; | |
3529 | ||
3530 | case STATUSTYPE_TABLE: | |
7dbcd137 | 3531 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 3532 | |
c538f6ec OK |
3533 | if (cc->key_size > 0) { |
3534 | if (cc->key_string) | |
3535 | DMEMIT(":%u:%s", cc->key_size, cc->key_string); | |
567dd8f3 MP |
3536 | else { |
3537 | for (i = 0; i < cc->key_size; i++) { | |
3538 | DMEMIT("%c%c", hex2asc(cc->key[i] >> 4), | |
3539 | hex2asc(cc->key[i] & 0xf)); | |
3540 | } | |
3541 | } | |
c538f6ec | 3542 | } else |
fd7c092e | 3543 | DMEMIT("-"); |
1da177e4 | 3544 | |
4ee218cd AM |
3545 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
3546 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 3547 | |
f3396c58 MP |
3548 | num_feature_args += !!ti->num_discard_bios; |
3549 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
0f5d8e6e | 3550 | num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); |
39d42fa9 IK |
3551 | num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); |
3552 | num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); | |
ff3af92b | 3553 | num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); |
8f0009a2 | 3554 | num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); |
ef43aa38 MB |
3555 | if (cc->on_disk_tag_size) |
3556 | num_feature_args++; | |
f3396c58 MP |
3557 | if (num_feature_args) { |
3558 | DMEMIT(" %d", num_feature_args); | |
3559 | if (ti->num_discard_bios) | |
3560 | DMEMIT(" allow_discards"); | |
3561 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) | |
3562 | DMEMIT(" same_cpu_crypt"); | |
0f5d8e6e MP |
3563 | if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) |
3564 | DMEMIT(" submit_from_crypt_cpus"); | |
39d42fa9 IK |
3565 | if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) |
3566 | DMEMIT(" no_read_workqueue"); | |
3567 | if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) | |
3568 | DMEMIT(" no_write_workqueue"); | |
ef43aa38 MB |
3569 | if (cc->on_disk_tag_size) |
3570 | DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); | |
8f0009a2 MB |
3571 | if (cc->sector_size != (1 << SECTOR_SHIFT)) |
3572 | DMEMIT(" sector_size:%d", cc->sector_size); | |
3573 | if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) | |
3574 | DMEMIT(" iv_large_sectors"); | |
f3396c58 | 3575 | } |
8ec45662 TS |
3576 | break; |
3577 | ||
3578 | case STATUSTYPE_IMA: | |
3579 | DMEMIT_TARGET_NAME_VERSION(ti->type); | |
3580 | DMEMIT(",allow_discards=%c", ti->num_discard_bios ? 'y' : 'n'); | |
3581 | DMEMIT(",same_cpu_crypt=%c", test_bit(DM_CRYPT_SAME_CPU, &cc->flags) ? 'y' : 'n'); | |
3582 | DMEMIT(",submit_from_crypt_cpus=%c", test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags) ? | |
3583 | 'y' : 'n'); | |
3584 | DMEMIT(",no_read_workqueue=%c", test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags) ? | |
3585 | 'y' : 'n'); | |
3586 | DMEMIT(",no_write_workqueue=%c", test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags) ? | |
3587 | 'y' : 'n'); | |
3588 | DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ? | |
3589 | 'y' : 'n'); | |
772ae5f5 | 3590 | |
8ec45662 TS |
3591 | if (cc->on_disk_tag_size) |
3592 | DMEMIT(",integrity_tag_size=%u,cipher_auth=%s", | |
3593 | cc->on_disk_tag_size, cc->cipher_auth); | |
3594 | if (cc->sector_size != (1 << SECTOR_SHIFT)) | |
3595 | DMEMIT(",sector_size=%d", cc->sector_size); | |
3596 | if (cc->cipher_string) | |
3597 | DMEMIT(",cipher_string=%s", cc->cipher_string); | |
3598 | ||
3599 | DMEMIT(",key_size=%u", cc->key_size); | |
3600 | DMEMIT(",key_parts=%u", cc->key_parts); | |
3601 | DMEMIT(",key_extra_size=%u", cc->key_extra_size); | |
3602 | DMEMIT(",key_mac_size=%u", cc->key_mac_size); | |
3603 | DMEMIT(";"); | |
1da177e4 LT |
3604 | break; |
3605 | } | |
1da177e4 LT |
3606 | } |
3607 | ||
e48d4bbf MB |
3608 | static void crypt_postsuspend(struct dm_target *ti) |
3609 | { | |
3610 | struct crypt_config *cc = ti->private; | |
3611 | ||
3612 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
3613 | } | |
3614 | ||
3615 | static int crypt_preresume(struct dm_target *ti) | |
3616 | { | |
3617 | struct crypt_config *cc = ti->private; | |
3618 | ||
3619 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
3620 | DMERR("aborting resume - crypt key is not set."); | |
3621 | return -EAGAIN; | |
3622 | } | |
3623 | ||
3624 | return 0; | |
3625 | } | |
3626 | ||
3627 | static void crypt_resume(struct dm_target *ti) | |
3628 | { | |
3629 | struct crypt_config *cc = ti->private; | |
3630 | ||
3631 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
3632 | } | |
3633 | ||
3634 | /* Message interface | |
3635 | * key set <key> | |
3636 | * key wipe | |
3637 | */ | |
86a3238c HM |
3638 | static int crypt_message(struct dm_target *ti, unsigned int argc, char **argv, |
3639 | char *result, unsigned int maxlen) | |
e48d4bbf MB |
3640 | { |
3641 | struct crypt_config *cc = ti->private; | |
c538f6ec | 3642 | int key_size, ret = -EINVAL; |
e48d4bbf MB |
3643 | |
3644 | if (argc < 2) | |
3645 | goto error; | |
3646 | ||
498f0103 | 3647 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
3648 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
3649 | DMWARN("not suspended during key manipulation."); | |
3650 | return -EINVAL; | |
3651 | } | |
498f0103 | 3652 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
c538f6ec OK |
3653 | /* The key size may not be changed. */ |
3654 | key_size = get_key_size(&argv[2]); | |
3655 | if (key_size < 0 || cc->key_size != key_size) { | |
3656 | memset(argv[2], '0', strlen(argv[2])); | |
3657 | return -EINVAL; | |
3658 | } | |
3659 | ||
542da317 MB |
3660 | ret = crypt_set_key(cc, argv[2]); |
3661 | if (ret) | |
3662 | return ret; | |
3663 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
3664 | ret = cc->iv_gen_ops->init(cc); | |
dc94902b OK |
3665 | /* wipe the kernel key payload copy */ |
3666 | if (cc->key_string) | |
3667 | memset(cc->key, 0, cc->key_size * sizeof(u8)); | |
542da317 MB |
3668 | return ret; |
3669 | } | |
4a52ffc7 | 3670 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) |
e48d4bbf MB |
3671 | return crypt_wipe_key(cc); |
3672 | } | |
3673 | ||
3674 | error: | |
3675 | DMWARN("unrecognised message received."); | |
3676 | return -EINVAL; | |
3677 | } | |
3678 | ||
af4874e0 MS |
3679 | static int crypt_iterate_devices(struct dm_target *ti, |
3680 | iterate_devices_callout_fn fn, void *data) | |
3681 | { | |
3682 | struct crypt_config *cc = ti->private; | |
3683 | ||
5dea271b | 3684 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
3685 | } |
3686 | ||
586b286b MS |
3687 | static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) |
3688 | { | |
8f0009a2 MB |
3689 | struct crypt_config *cc = ti->private; |
3690 | ||
586b286b MS |
3691 | /* |
3692 | * Unfortunate constraint that is required to avoid the potential | |
3693 | * for exceeding underlying device's max_segments limits -- due to | |
3694 | * crypt_alloc_buffer() possibly allocating pages for the encryption | |
3695 | * bio that are not as physically contiguous as the original bio. | |
3696 | */ | |
3697 | limits->max_segment_size = PAGE_SIZE; | |
8f0009a2 | 3698 | |
bc9e9cf0 | 3699 | limits->logical_block_size = |
86a3238c | 3700 | max_t(unsigned int, limits->logical_block_size, cc->sector_size); |
bc9e9cf0 | 3701 | limits->physical_block_size = |
86a3238c HM |
3702 | max_t(unsigned int, limits->physical_block_size, cc->sector_size); |
3703 | limits->io_min = max_t(unsigned int, limits->io_min, cc->sector_size); | |
86e4d3e8 | 3704 | limits->dma_alignment = limits->logical_block_size - 1; |
586b286b MS |
3705 | } |
3706 | ||
1da177e4 LT |
3707 | static struct target_type crypt_target = { |
3708 | .name = "crypt", | |
0e0c50e8 | 3709 | .version = {1, 25, 0}, |
1da177e4 LT |
3710 | .module = THIS_MODULE, |
3711 | .ctr = crypt_ctr, | |
3712 | .dtr = crypt_dtr, | |
8e225f04 DLM |
3713 | .features = DM_TARGET_ZONED_HM, |
3714 | .report_zones = crypt_report_zones, | |
1da177e4 LT |
3715 | .map = crypt_map, |
3716 | .status = crypt_status, | |
e48d4bbf MB |
3717 | .postsuspend = crypt_postsuspend, |
3718 | .preresume = crypt_preresume, | |
3719 | .resume = crypt_resume, | |
3720 | .message = crypt_message, | |
af4874e0 | 3721 | .iterate_devices = crypt_iterate_devices, |
586b286b | 3722 | .io_hints = crypt_io_hints, |
1da177e4 | 3723 | }; |
3664ff82 | 3724 | module_dm(crypt); |
1da177e4 | 3725 | |
bf14299f | 3726 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
3727 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
3728 | MODULE_LICENSE("GPL"); |