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Merge tag 'riscv-for-linus-5.8-mw1' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-hirsute-kernel.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
bbb16584
MB		 4 * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2020 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 6 *
7 * This file is released under the GPL.
8 */
9
43d69034 10#include <linux/completion.h>
d1806f6a 11#include <linux/err.h>
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
c538f6ec 15#include <linux/key.h>
1da177e4
LT		 16#include <linux/bio.h>
17#include <linux/blkdev.h>
18#include <linux/mempool.h>
19#include <linux/slab.h>
20#include <linux/crypto.h>
21#include <linux/workqueue.h>
dc267621 22#include <linux/kthread.h>
3fcfab16 23#include <linux/backing-dev.h>
60063497 24#include <linux/atomic.h>
378f058c 25#include <linux/scatterlist.h>
b3c5fd30 26#include <linux/rbtree.h>
027c431c 27#include <linux/ctype.h>
1da177e4 28#include <asm/page.h>
48527fa7 29#include <asm/unaligned.h>
34745785
MB		 30#include <crypto/hash.h>
31#include <crypto/md5.h>
32#include <crypto/algapi.h>
bbdb23b5 33#include <crypto/skcipher.h>
ef43aa38
MB		 34#include <crypto/aead.h>
35#include <crypto/authenc.h>
36#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
27f5411a 37#include <linux/key-type.h>
c538f6ec 38#include <keys/user-type.h>
27f5411a 39#include <keys/encrypted-type.h>
1da177e4 40
586e80e6 41#include <linux/device-mapper.h>
1da177e4 42
72d94861 43#define DM_MSG_PREFIX "crypt"
1da177e4 44
1da177e4
LT		 45/*
46 * context holding the current state of a multi-part conversion
47 */
48struct convert_context {
43d69034 49 struct completion restart;
1da177e4
LT		 50 struct bio *bio_in;
51 struct bio *bio_out;
003b5c57
KO		 52 struct bvec_iter iter_in;
53 struct bvec_iter iter_out;
8d683dcd 54 u64 cc_sector;
40b6229b 55 atomic_t cc_pending;
ef43aa38
MB		 56 union {
57 struct skcipher_request *req;
58 struct aead_request *req_aead;
59 } r;
60
1da177e4
LT		 61};
62
53017030
MB		 63/*
64 * per bio private data
65 */
66struct dm_crypt_io {
49a8a920 67 struct crypt_config *cc;
53017030 68 struct bio *base_bio;
ef43aa38
MB		 69 u8 *integrity_metadata;
70 bool integrity_metadata_from_pool;
53017030
MB		 71 struct work_struct work;
72
73 struct convert_context ctx;
74
40b6229b 75 atomic_t io_pending;
4e4cbee9 76 blk_status_t error;
0c395b0f 77 sector_t sector;
dc267621 78
b3c5fd30 79 struct rb_node rb_node;
298a9fa0 80} CRYPTO_MINALIGN_ATTR;
53017030 81
01482b76 82struct dm_crypt_request {
b2174eeb 83 struct convert_context *ctx;
ef43aa38
MB		 84 struct scatterlist sg_in[4];
85 struct scatterlist sg_out[4];
8d683dcd 86 u64 iv_sector;
01482b76
MB		 87};
88
1da177e4
LT		 89struct crypt_config;
90
91struct crypt_iv_operations {
92 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 93 const char *opts);
1da177e4 94 void (*dtr)(struct crypt_config *cc);
b95bf2d3 95 int (*init)(struct crypt_config *cc);
542da317 96 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 97 int (*generator)(struct crypt_config *cc, u8 *iv,
98 struct dm_crypt_request *dmreq);
99 int (*post)(struct crypt_config *cc, u8 *iv,
100 struct dm_crypt_request *dmreq);
1da177e4
LT		 101};
102
60473592
MB		 103struct iv_benbi_private {
104 int shift;
105};
106
34745785
MB		 107#define LMK_SEED_SIZE 64 /* hash + 0 */
108struct iv_lmk_private {
109 struct crypto_shash *hash_tfm;
110 u8 *seed;
111};
112
ed04d981
MB		 113#define TCW_WHITENING_SIZE 16
114struct iv_tcw_private {
115 struct crypto_shash *crc32_tfm;
116 u8 *iv_seed;
117 u8 *whitening;
118};
119
bbb16584
MB		 120#define ELEPHANT_MAX_KEY_SIZE 32
121struct iv_elephant_private {
122 struct crypto_skcipher *tfm;
123};
124
1da177e4
LT		 125/*
126 * Crypt: maps a linear range of a block device
127 * and encrypts / decrypts at the same time.
128 */
0f5d8e6e 129enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
f659b100 130 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
c0297721 131
ef43aa38
MB		 132enum cipher_flags {
133 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */
8f0009a2 134 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */
bbb16584 135 CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */
ef43aa38
MB		 136};
137
c0297721 138/*
610f2de3 139 * The fields in here must be read only after initialization.
c0297721 140 */
1da177e4
LT		 141struct crypt_config {
142 struct dm_dev *dev;
143 sector_t start;
144
5059353d
MP		 145 struct percpu_counter n_allocated_pages;
146
cabf08e4
MB		 147 struct workqueue_struct *io_queue;
148 struct workqueue_struct *crypt_queue;
3f1e9070 149
c7329eff 150 spinlock_t write_thread_lock;
72d711c8 151 struct task_struct *write_thread;
b3c5fd30 152 struct rb_root write_tree;
dc267621 153
7dbcd137 154 char *cipher_string;
ef43aa38 155 char *cipher_auth;
c538f6ec 156 char *key_string;
5ebaee6d 157
1b1b58f5 158 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 159 union {
60473592 160 struct iv_benbi_private benbi;
34745785 161 struct iv_lmk_private lmk;
ed04d981 162 struct iv_tcw_private tcw;
bbb16584 163 struct iv_elephant_private elephant;
79066ad3 164 } iv_gen_private;
8d683dcd 165 u64 iv_offset;
1da177e4 166 unsigned int iv_size;
ff3af92b
MP		 167 unsigned short int sector_size;
168 unsigned char sector_shift;
1da177e4 169
ef43aa38
MB		 170 union {
171 struct crypto_skcipher **tfms;
172 struct crypto_aead **tfms_aead;
173 } cipher_tfm;
d1f96423 174 unsigned tfms_count;
ef43aa38 175 unsigned long cipher_flags;
c0297721 176
ddd42edf
MB		 177 /*
178 * Layout of each crypto request:
179 *
bbdb23b5 180 * struct skcipher_request
ddd42edf
MB		 181 * context
182 * padding
183 * struct dm_crypt_request
184 * padding
185 * IV
186 *
187 * The padding is added so that dm_crypt_request and the IV are
188 * correctly aligned.
189 */
190 unsigned int dmreq_start;
ddd42edf 191
298a9fa0
MP		 192 unsigned int per_bio_data_size;
193
e48d4bbf 194 unsigned long flags;
1da177e4 195 unsigned int key_size;
da31a078
MB		 196 unsigned int key_parts; /* independent parts in key buffer */
197 unsigned int key_extra_size; /* additional keys length */
ef43aa38
MB		 198 unsigned int key_mac_size; /* MAC key size for authenc(...) */
199
200 unsigned int integrity_tag_size;
201 unsigned int integrity_iv_size;
202 unsigned int on_disk_tag_size;
203
72d711c8
MS		 204 /*
205 * pool for per bio private data, crypto requests,
206 * encryption requeusts/buffer pages and integrity tags
207 */
208 unsigned tag_pool_max_sectors;
209 mempool_t tag_pool;
210 mempool_t req_pool;
211 mempool_t page_pool;
212
213 struct bio_set bs;
214 struct mutex bio_alloc_lock;
215
ef43aa38 216 u8 *authenc_key; /* space for keys in authenc() format (if used) */
b18ae8dd 217 u8 key[];
1da177e4
LT		 218};
219
ef43aa38
MB		 220#define MIN_IOS 64
221#define MAX_TAG_SIZE 480
222#define POOL_ENTRY_SIZE 512
1da177e4 223
5059353d
MP		 224static DEFINE_SPINLOCK(dm_crypt_clients_lock);
225static unsigned dm_crypt_clients_n = 0;
226static volatile unsigned long dm_crypt_pages_per_client;
227#define DM_CRYPT_MEMORY_PERCENT 2
228#define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_PAGES * 16)
229
028867ac 230static void clone_init(struct dm_crypt_io *, struct bio *);
395b167c 231static void kcryptd_queue_crypt(struct dm_crypt_io *io);
ef43aa38
MB		 232static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
233 struct scatterlist *sg);
027581f3 234
3fd53533
YY		 235static bool crypt_integrity_aead(struct crypt_config *cc);
236
c0297721 237/*
86f917ad 238 * Use this to access cipher attributes that are independent of the key.
c0297721 239 */
bbdb23b5 240static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 241{
ef43aa38
MB		 242 return cc->cipher_tfm.tfms[0];
243}
244
245static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
246{
247 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 248}
249
1da177e4
LT		 250/*
251 * Different IV generation algorithms:
252 *
3c164bd8 253 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 254 * number, padded with zeros if necessary.
1da177e4 255 *
61afef61
MB		 256 * plain64: the initial vector is the 64-bit little-endian version of the sector
257 * number, padded with zeros if necessary.
258 *
7e3fd855
MB		 259 * plain64be: the initial vector is the 64-bit big-endian version of the sector
260 * number, padded with zeros if necessary.
261 *
3c164bd8
RS		 262 * essiv: "encrypted sector|salt initial vector", the sector number is
263 * encrypted with the bulk cipher using a salt as key. The salt
264 * should be derived from the bulk cipher's key via hashing.
1da177e4 265 *
48527fa7
RS		 266 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
267 * (needed for LRW-32-AES and possible other narrow block modes)
268 *
46b47730
LN		 269 * null: the initial vector is always zero. Provides compatibility with
270 * obsolete loop_fish2 devices. Do not use for new devices.
271 *
34745785
MB		 272 * lmk: Compatible implementation of the block chaining mode used
273 * by the Loop-AES block device encryption system
274 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
275 * It operates on full 512 byte sectors and uses CBC
276 * with an IV derived from the sector number, the data and
277 * optionally extra IV seed.
278 * This means that after decryption the first block
279 * of sector must be tweaked according to decrypted data.
280 * Loop-AES can use three encryption schemes:
281 * version 1: is plain aes-cbc mode
282 * version 2: uses 64 multikey scheme with lmk IV generator
283 * version 3: the same as version 2 with additional IV seed
284 * (it uses 65 keys, last key is used as IV seed)
285 *
ed04d981
MB		 286 * tcw: Compatible implementation of the block chaining mode used
287 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 288 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 289 * It operates on full 512 byte sectors and uses CBC
290 * with an IV derived from initial key and the sector number.
291 * In addition, whitening value is applied on every sector, whitening
292 * is calculated from initial key, sector number and mixed using CRC32.
293 * Note that this encryption scheme is vulnerable to watermarking attacks
294 * and should be used for old compatible containers access only.
b9411d73
MB		 295 *
296 * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode)
297 * The IV is encrypted little-endian byte-offset (with the same key
298 * and cipher as the volume).
bbb16584
MB		 299 *
300 * elephant: The extended version of eboiv with additional Elephant diffuser
301 * used with Bitlocker CBC mode.
302 * This mode was used in older Windows systems
303 * http://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf
1da177e4
LT		 304 */
305
2dc5327d
MB		 306static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
307 struct dm_crypt_request *dmreq)
1da177e4
LT		 308{
309 memset(iv, 0, cc->iv_size);
283a8328 310 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 311
312 return 0;
313}
314
61afef61 315static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 316 struct dm_crypt_request *dmreq)
61afef61
MB		 317{
318 memset(iv, 0, cc->iv_size);
283a8328 319 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 320
321 return 0;
322}
323
7e3fd855
MB		 324static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv,
325 struct dm_crypt_request *dmreq)
326{
327 memset(iv, 0, cc->iv_size);
328 /* iv_size is at least of size u64; usually it is 16 bytes */
329 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector);
330
331 return 0;
332}
333
2dc5327d
MB		 334static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
335 struct dm_crypt_request *dmreq)
1da177e4 336{
a1a262b6
AB		 337 /*
338 * ESSIV encryption of the IV is now handled by the crypto API,
339 * so just pass the plain sector number here.
340 */
1da177e4 341 memset(iv, 0, cc->iv_size);
283a8328 342 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721 343
1da177e4
LT		 344 return 0;
345}
346
48527fa7
RS		 347static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
348 const char *opts)
349{
4ea9471f
MB		 350 unsigned bs;
351 int log;
352
3fd53533 353 if (crypt_integrity_aead(cc))
4ea9471f
MB		 354 bs = crypto_aead_blocksize(any_tfm_aead(cc));
355 else
356 bs = crypto_skcipher_blocksize(any_tfm(cc));
357 log = ilog2(bs);
48527fa7
RS		 358
359 /* we need to calculate how far we must shift the sector count
360 * to get the cipher block count, we use this shift in _gen */
361
362 if (1 << log != bs) {
363 ti->error = "cypher blocksize is not a power of 2";
364 return -EINVAL;
365 }
366
367 if (log > 9) {
368 ti->error = "cypher blocksize is > 512";
369 return -EINVAL;
370 }
371
60473592 372 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 373
374 return 0;
375}
376
377static void crypt_iv_benbi_dtr(struct crypt_config *cc)
378{
48527fa7
RS		 379}
380
2dc5327d
MB		 381static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
382 struct dm_crypt_request *dmreq)
48527fa7 383{
79066ad3
HX		 384 __be64 val;
385
48527fa7 386 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 387
2dc5327d 388 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 389 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 390
1da177e4
LT		 391 return 0;
392}
393
2dc5327d
MB		 394static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
395 struct dm_crypt_request *dmreq)
46b47730
LN		 396{
397 memset(iv, 0, cc->iv_size);
398
399 return 0;
400}
401
34745785
MB		 402static void crypt_iv_lmk_dtr(struct crypt_config *cc)
403{
404 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
405
406 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
407 crypto_free_shash(lmk->hash_tfm);
408 lmk->hash_tfm = NULL;
409
410 kzfree(lmk->seed);
411 lmk->seed = NULL;
412}
413
414static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
415 const char *opts)
416{
417 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
418
8f0009a2
MB		 419 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
420 ti->error = "Unsupported sector size for LMK";
421 return -EINVAL;
422 }
423
34745785
MB		 424 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
425 if (IS_ERR(lmk->hash_tfm)) {
426 ti->error = "Error initializing LMK hash";
427 return PTR_ERR(lmk->hash_tfm);
428 }
429
430 /* No seed in LMK version 2 */
431 if (cc->key_parts == cc->tfms_count) {
432 lmk->seed = NULL;
433 return 0;
434 }
435
436 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
437 if (!lmk->seed) {
438 crypt_iv_lmk_dtr(cc);
439 ti->error = "Error kmallocing seed storage in LMK";
440 return -ENOMEM;
441 }
442
443 return 0;
444}
445
446static int crypt_iv_lmk_init(struct crypt_config *cc)
447{
448 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
449 int subkey_size = cc->key_size / cc->key_parts;
450
451 /* LMK seed is on the position of LMK_KEYS + 1 key */
452 if (lmk->seed)
453 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
454 crypto_shash_digestsize(lmk->hash_tfm));
455
456 return 0;
457}
458
459static int crypt_iv_lmk_wipe(struct crypt_config *cc)
460{
461 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
462
463 if (lmk->seed)
464 memset(lmk->seed, 0, LMK_SEED_SIZE);
465
466 return 0;
467}
468
469static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
470 struct dm_crypt_request *dmreq,
471 u8 *data)
472{
473 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 474 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 475 struct md5_state md5state;
da31a078 476 __le32 buf[4];
34745785
MB		 477 int i, r;
478
b6106265 479 desc->tfm = lmk->hash_tfm;
34745785 480
b6106265 481 r = crypto_shash_init(desc);
34745785
MB		 482 if (r)
483 return r;
484
485 if (lmk->seed) {
b6106265 486 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 487 if (r)
488 return r;
489 }
490
491 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 492 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 493 if (r)
494 return r;
495
496 /* Sector is cropped to 56 bits here */
497 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
498 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
499 buf[2] = cpu_to_le32(4024);
500 buf[3] = 0;
b6106265 501 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 502 if (r)
503 return r;
504
505 /* No MD5 padding here */
b6106265 506 r = crypto_shash_export(desc, &md5state);
34745785
MB		 507 if (r)
508 return r;
509
510 for (i = 0; i < MD5_HASH_WORDS; i++)
511 __cpu_to_le32s(&md5state.hash[i]);
512 memcpy(iv, &md5state.hash, cc->iv_size);
513
514 return 0;
515}
516
517static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
518 struct dm_crypt_request *dmreq)
519{
ef43aa38 520 struct scatterlist *sg;
34745785
MB		 521 u8 *src;
522 int r = 0;
523
524 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 525 sg = crypt_get_sg_data(cc, dmreq->sg_in);
526 src = kmap_atomic(sg_page(sg));
527 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 528 kunmap_atomic(src);
34745785
MB		 529 } else
530 memset(iv, 0, cc->iv_size);
531
532 return r;
533}
534
535static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
536 struct dm_crypt_request *dmreq)
537{
ef43aa38 538 struct scatterlist *sg;
34745785
MB		 539 u8 *dst;
540 int r;
541
542 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
543 return 0;
544
ef43aa38
MB		 545 sg = crypt_get_sg_data(cc, dmreq->sg_out);
546 dst = kmap_atomic(sg_page(sg));
547 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 548
549 /* Tweak the first block of plaintext sector */
550 if (!r)
ef43aa38 551 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 552
c2e022cb 553 kunmap_atomic(dst);
34745785
MB		 554 return r;
555}
556
ed04d981
MB		 557static void crypt_iv_tcw_dtr(struct crypt_config *cc)
558{
559 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
560
561 kzfree(tcw->iv_seed);
562 tcw->iv_seed = NULL;
563 kzfree(tcw->whitening);
564 tcw->whitening = NULL;
565
566 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
567 crypto_free_shash(tcw->crc32_tfm);
568 tcw->crc32_tfm = NULL;
569}
570
571static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
572 const char *opts)
573{
574 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
575
8f0009a2
MB		 576 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
577 ti->error = "Unsupported sector size for TCW";
578 return -EINVAL;
579 }
580
ed04d981
MB		 581 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
582 ti->error = "Wrong key size for TCW";
583 return -EINVAL;
584 }
585
586 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
587 if (IS_ERR(tcw->crc32_tfm)) {
588 ti->error = "Error initializing CRC32 in TCW";
589 return PTR_ERR(tcw->crc32_tfm);
590 }
591
592 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
593 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
594 if (!tcw->iv_seed || !tcw->whitening) {
595 crypt_iv_tcw_dtr(cc);
596 ti->error = "Error allocating seed storage in TCW";
597 return -ENOMEM;
598 }
599
600 return 0;
601}
602
603static int crypt_iv_tcw_init(struct crypt_config *cc)
604{
605 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
606 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
607
608 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
609 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
610 TCW_WHITENING_SIZE);
611
612 return 0;
613}
614
615static int crypt_iv_tcw_wipe(struct crypt_config *cc)
616{
617 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
618
619 memset(tcw->iv_seed, 0, cc->iv_size);
620 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
621
622 return 0;
623}
624
625static int crypt_iv_tcw_whitening(struct crypt_config *cc,
626 struct dm_crypt_request *dmreq,
627 u8 *data)
628{
629 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 630 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 631 u8 buf[TCW_WHITENING_SIZE];
b6106265 632 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 633 int i, r;
634
635 /* xor whitening with sector number */
45fe93df
AB		 636 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
637 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 638
639 /* calculate crc32 for every 32bit part and xor it */
b6106265 640 desc->tfm = tcw->crc32_tfm;
ed04d981 641 for (i = 0; i < 4; i++) {
b6106265 642 r = crypto_shash_init(desc);
ed04d981
MB		 643 if (r)
644 goto out;
b6106265 645 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 646 if (r)
647 goto out;
b6106265 648 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 649 if (r)
650 goto out;
651 }
652 crypto_xor(&buf[0], &buf[12], 4);
653 crypto_xor(&buf[4], &buf[8], 4);
654
655 /* apply whitening (8 bytes) to whole sector */
656 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
657 crypto_xor(data + i * 8, buf, 8);
658out:
1a71d6ff 659 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 660 return r;
661}
662
663static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
664 struct dm_crypt_request *dmreq)
665{
ef43aa38 666 struct scatterlist *sg;
ed04d981 667 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 668 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 669 u8 *src;
670 int r = 0;
671
672 /* Remove whitening from ciphertext */
673 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 674 sg = crypt_get_sg_data(cc, dmreq->sg_in);
675 src = kmap_atomic(sg_page(sg));
676 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 677 kunmap_atomic(src);
678 }
679
680 /* Calculate IV */
45fe93df 681 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 682 if (cc->iv_size > 8)
45fe93df
AB		 683 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
684 cc->iv_size - 8);
ed04d981
MB		 685
686 return r;
687}
688
689static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
690 struct dm_crypt_request *dmreq)
691{
ef43aa38 692 struct scatterlist *sg;
ed04d981
MB		 693 u8 *dst;
694 int r;
695
696 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
697 return 0;
698
699 /* Apply whitening on ciphertext */
ef43aa38
MB		 700 sg = crypt_get_sg_data(cc, dmreq->sg_out);
701 dst = kmap_atomic(sg_page(sg));
702 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 703 kunmap_atomic(dst);
704
705 return r;
706}
707
ef43aa38
MB		 708static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
709 struct dm_crypt_request *dmreq)
710{
711 /* Used only for writes, there must be an additional space to store IV */
712 get_random_bytes(iv, cc->iv_size);
713 return 0;
714}
715
b9411d73
MB		 716static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti,
717 const char *opts)
718{
3fd53533 719 if (crypt_integrity_aead(cc)) {
39d13a1a
AB		 720 ti->error = "AEAD transforms not supported for EBOIV";
721 return -EINVAL;
b9411d73
MB		 722 }
723
39d13a1a 724 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) {
b9411d73
MB		 725 ti->error = "Block size of EBOIV cipher does "
726 "not match IV size of block cipher";
b9411d73
MB		 727 return -EINVAL;
728 }
729
b9411d73
MB		 730 return 0;
731}
732
39d13a1a
AB		 733static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
734 struct dm_crypt_request *dmreq)
b9411d73 735{
39d13a1a
AB		 736 u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64));
737 struct skcipher_request *req;
738 struct scatterlist src, dst;
739 struct crypto_wait wait;
b9411d73
MB		 740 int err;
741
9402e959 742 req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO);
39d13a1a
AB		 743 if (!req)
744 return -ENOMEM;
b9411d73 745
39d13a1a
AB		 746 memset(buf, 0, cc->iv_size);
747 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
b9411d73 748
39d13a1a
AB		 749 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size);
750 sg_init_one(&dst, iv, cc->iv_size);
751 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf);
752 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
753 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
754 skcipher_request_free(req);
b9411d73 755
39d13a1a 756 return err;
b9411d73
MB		 757}
758
bbb16584
MB		 759static void crypt_iv_elephant_dtr(struct crypt_config *cc)
760{
761 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
762
763 crypto_free_skcipher(elephant->tfm);
764 elephant->tfm = NULL;
765}
766
767static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti,
768 const char *opts)
769{
770 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
771 int r;
772
773 elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);
774 if (IS_ERR(elephant->tfm)) {
775 r = PTR_ERR(elephant->tfm);
776 elephant->tfm = NULL;
777 return r;
778 }
779
780 r = crypt_iv_eboiv_ctr(cc, ti, NULL);
781 if (r)
782 crypt_iv_elephant_dtr(cc);
783 return r;
784}
785
786static void diffuser_disk_to_cpu(u32 *d, size_t n)
787{
788#ifndef __LITTLE_ENDIAN
789 int i;
790
791 for (i = 0; i < n; i++)
792 d[i] = le32_to_cpu((__le32)d[i]);
793#endif
794}
795
796static void diffuser_cpu_to_disk(__le32 *d, size_t n)
797{
798#ifndef __LITTLE_ENDIAN
799 int i;
800
801 for (i = 0; i < n; i++)
802 d[i] = cpu_to_le32((u32)d[i]);
803#endif
804}
805
806static void diffuser_a_decrypt(u32 *d, size_t n)
807{
808 int i, i1, i2, i3;
809
810 for (i = 0; i < 5; i++) {
811 i1 = 0;
812 i2 = n - 2;
813 i3 = n - 5;
814
815 while (i1 < (n - 1)) {
816 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
817 i1++; i2++; i3++;
818
819 if (i3 >= n)
820 i3 -= n;
821
822 d[i1] += d[i2] ^ d[i3];
823 i1++; i2++; i3++;
824
825 if (i2 >= n)
826 i2 -= n;
827
828 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
829 i1++; i2++; i3++;
830
831 d[i1] += d[i2] ^ d[i3];
832 i1++; i2++; i3++;
833 }
834 }
835}
836
837static void diffuser_a_encrypt(u32 *d, size_t n)
838{
839 int i, i1, i2, i3;
840
841 for (i = 0; i < 5; i++) {
842 i1 = n - 1;
843 i2 = n - 2 - 1;
844 i3 = n - 5 - 1;
845
846 while (i1 > 0) {
847 d[i1] -= d[i2] ^ d[i3];
848 i1--; i2--; i3--;
849
850 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
851 i1--; i2--; i3--;
852
853 if (i2 < 0)
854 i2 += n;
855
856 d[i1] -= d[i2] ^ d[i3];
857 i1--; i2--; i3--;
858
859 if (i3 < 0)
860 i3 += n;
861
862 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
863 i1--; i2--; i3--;
864 }
865 }
866}
867
868static void diffuser_b_decrypt(u32 *d, size_t n)
869{
870 int i, i1, i2, i3;
871
872 for (i = 0; i < 3; i++) {
873 i1 = 0;
874 i2 = 2;
875 i3 = 5;
876
877 while (i1 < (n - 1)) {
878 d[i1] += d[i2] ^ d[i3];
879 i1++; i2++; i3++;
880
881 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
882 i1++; i2++; i3++;
883
884 if (i2 >= n)
885 i2 -= n;
886
887 d[i1] += d[i2] ^ d[i3];
888 i1++; i2++; i3++;
889
890 if (i3 >= n)
891 i3 -= n;
892
893 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
894 i1++; i2++; i3++;
895 }
896 }
897}
898
899static void diffuser_b_encrypt(u32 *d, size_t n)
900{
901 int i, i1, i2, i3;
902
903 for (i = 0; i < 3; i++) {
904 i1 = n - 1;
905 i2 = 2 - 1;
906 i3 = 5 - 1;
907
908 while (i1 > 0) {
909 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
910 i1--; i2--; i3--;
911
912 if (i3 < 0)
913 i3 += n;
914
915 d[i1] -= d[i2] ^ d[i3];
916 i1--; i2--; i3--;
917
918 if (i2 < 0)
919 i2 += n;
920
921 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
922 i1--; i2--; i3--;
923
924 d[i1] -= d[i2] ^ d[i3];
925 i1--; i2--; i3--;
926 }
927 }
928}
929
930static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq)
931{
932 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
933 u8 *es, *ks, *data, *data2, *data_offset;
934 struct skcipher_request *req;
935 struct scatterlist *sg, *sg2, src, dst;
936 struct crypto_wait wait;
937 int i, r;
938
939 req = skcipher_request_alloc(elephant->tfm, GFP_NOIO);
940 es = kzalloc(16, GFP_NOIO); /* Key for AES */
941 ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */
942
943 if (!req || !es || !ks) {
944 r = -ENOMEM;
945 goto out;
946 }
947
948 *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
949
950 /* E(Ks, e(s)) */
951 sg_init_one(&src, es, 16);
952 sg_init_one(&dst, ks, 16);
953 skcipher_request_set_crypt(req, &src, &dst, 16, NULL);
954 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
955 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
956 if (r)
957 goto out;
958
959 /* E(Ks, e'(s)) */
960 es[15] = 0x80;
961 sg_init_one(&dst, &ks[16], 16);
962 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
963 if (r)
964 goto out;
965
966 sg = crypt_get_sg_data(cc, dmreq->sg_out);
967 data = kmap_atomic(sg_page(sg));
968 data_offset = data + sg->offset;
969
970 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */
971 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
972 sg2 = crypt_get_sg_data(cc, dmreq->sg_in);
973 data2 = kmap_atomic(sg_page(sg2));
974 memcpy(data_offset, data2 + sg2->offset, cc->sector_size);
975 kunmap_atomic(data2);
976 }
977
978 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
979 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
980 diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
981 diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
982 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
983 }
984
985 for (i = 0; i < (cc->sector_size / 32); i++)
986 crypto_xor(data_offset + i * 32, ks, 32);
987
988 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
989 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
990 diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
991 diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
992 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
993 }
994
995 kunmap_atomic(data);
996out:
997 kzfree(ks);
998 kzfree(es);
999 skcipher_request_free(req);
1000 return r;
1001}
1002
1003static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv,
1004 struct dm_crypt_request *dmreq)
1005{
1006 int r;
1007
1008 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
1009 r = crypt_iv_elephant(cc, dmreq);
1010 if (r)
1011 return r;
1012 }
1013
1014 return crypt_iv_eboiv_gen(cc, iv, dmreq);
1015}
1016
1017static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv,
1018 struct dm_crypt_request *dmreq)
1019{
1020 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
1021 return crypt_iv_elephant(cc, dmreq);
1022
1023 return 0;
1024}
1025
1026static int crypt_iv_elephant_init(struct crypt_config *cc)
1027{
1028 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1029 int key_offset = cc->key_size - cc->key_extra_size;
1030
1031 return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size);
1032}
1033
1034static int crypt_iv_elephant_wipe(struct crypt_config *cc)
1035{
1036 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1037 u8 key[ELEPHANT_MAX_KEY_SIZE];
1038
1039 memset(key, 0, cc->key_extra_size);
1040 return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size);
1041}
1042
1b1b58f5 1043static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 1044 .generator = crypt_iv_plain_gen
1045};
1046
1b1b58f5 1047static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 1048 .generator = crypt_iv_plain64_gen
1049};
1050
7e3fd855
MB		 1051static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
1052 .generator = crypt_iv_plain64be_gen
1053};
1054
1b1b58f5 1055static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 1056 .generator = crypt_iv_essiv_gen
1057};
1058
1b1b58f5 1059static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 1060 .ctr = crypt_iv_benbi_ctr,
1061 .dtr = crypt_iv_benbi_dtr,
1062 .generator = crypt_iv_benbi_gen
1063};
1da177e4 1064
1b1b58f5 1065static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 1066 .generator = crypt_iv_null_gen
1067};
1068
1b1b58f5 1069static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 1070 .ctr = crypt_iv_lmk_ctr,
1071 .dtr = crypt_iv_lmk_dtr,
1072 .init = crypt_iv_lmk_init,
1073 .wipe = crypt_iv_lmk_wipe,
1074 .generator = crypt_iv_lmk_gen,
1075 .post = crypt_iv_lmk_post
1076};
1077
1b1b58f5 1078static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 1079 .ctr = crypt_iv_tcw_ctr,
1080 .dtr = crypt_iv_tcw_dtr,
1081 .init = crypt_iv_tcw_init,
1082 .wipe = crypt_iv_tcw_wipe,
1083 .generator = crypt_iv_tcw_gen,
1084 .post = crypt_iv_tcw_post
1085};
1086
ef43aa38
MB		 1087static struct crypt_iv_operations crypt_iv_random_ops = {
1088 .generator = crypt_iv_random_gen
1089};
1090
b9411d73
MB		 1091static struct crypt_iv_operations crypt_iv_eboiv_ops = {
1092 .ctr = crypt_iv_eboiv_ctr,
b9411d73
MB		 1093 .generator = crypt_iv_eboiv_gen
1094};
1095
bbb16584
MB		 1096static struct crypt_iv_operations crypt_iv_elephant_ops = {
1097 .ctr = crypt_iv_elephant_ctr,
1098 .dtr = crypt_iv_elephant_dtr,
1099 .init = crypt_iv_elephant_init,
1100 .wipe = crypt_iv_elephant_wipe,
1101 .generator = crypt_iv_elephant_gen,
1102 .post = crypt_iv_elephant_post
1103};
1104
ef43aa38
MB		 1105/*
1106 * Integrity extensions
1107 */
1108static bool crypt_integrity_aead(struct crypt_config *cc)
1109{
1110 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
1111}
1112
1113static bool crypt_integrity_hmac(struct crypt_config *cc)
1114{
33d2f09f 1115 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 1116}
1117
1118/* Get sg containing data */
1119static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
1120 struct scatterlist *sg)
1121{
33d2f09f 1122 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 1123 return &sg[2];
1124
1125 return sg;
1126}
1127
1128static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
1129{
1130 struct bio_integrity_payload *bip;
1131 unsigned int tag_len;
1132 int ret;
1133
1134 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
1135 return 0;
1136
1137 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
1138 if (IS_ERR(bip))
1139 return PTR_ERR(bip);
1140
ff0c129d 1141 tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift);
ef43aa38
MB		 1142
1143 bip->bip_iter.bi_size = tag_len;
1144 bip->bip_iter.bi_sector = io->cc->start + io->sector;
1145
ef43aa38
MB		 1146 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
1147 tag_len, offset_in_page(io->integrity_metadata));
1148 if (unlikely(ret != tag_len))
1149 return -ENOMEM;
1150
1151 return 0;
1152}
1153
1154static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
1155{
1156#ifdef CONFIG_BLK_DEV_INTEGRITY
1157 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
7a1cd723 1158 struct mapped_device *md = dm_table_get_md(ti->table);
ef43aa38
MB		 1159
1160 /* From now we require underlying device with our integrity profile */
1161 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
1162 ti->error = "Integrity profile not supported.";
1163 return -EINVAL;
1164 }
1165
583fe747
MP		 1166 if (bi->tag_size != cc->on_disk_tag_size ||
1167 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 1168 ti->error = "Integrity profile tag size mismatch.";
1169 return -EINVAL;
1170 }
583fe747
MP		 1171 if (1 << bi->interval_exp != cc->sector_size) {
1172 ti->error = "Integrity profile sector size mismatch.";
1173 return -EINVAL;
1174 }
ef43aa38 1175
33d2f09f 1176 if (crypt_integrity_aead(cc)) {
ef43aa38 1177 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
7a1cd723 1178 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md),
ef43aa38
MB		 1179 cc->integrity_tag_size, cc->integrity_iv_size);
1180
1181 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
1182 ti->error = "Integrity AEAD auth tag size is not supported.";
1183 return -EINVAL;
1184 }
1185 } else if (cc->integrity_iv_size)
7a1cd723 1186 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md),
ef43aa38
MB		 1187 cc->integrity_iv_size);
1188
1189 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
1190 ti->error = "Not enough space for integrity tag in the profile.";
1191 return -EINVAL;
1192 }
1193
1194 return 0;
1195#else
1196 ti->error = "Integrity profile not supported.";
1197 return -EINVAL;
1198#endif
1199}
1200
d469f841
MB		 1201static void crypt_convert_init(struct crypt_config *cc,
1202 struct convert_context *ctx,
1203 struct bio *bio_out, struct bio *bio_in,
fcd369da 1204 sector_t sector)
1da177e4
LT		 1205{
1206 ctx->bio_in = bio_in;
1207 ctx->bio_out = bio_out;
003b5c57
KO		 1208 if (bio_in)
1209 ctx->iter_in = bio_in->bi_iter;
1210 if (bio_out)
1211 ctx->iter_out = bio_out->bi_iter;
c66029f4 1212 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1213 init_completion(&ctx->restart);
1da177e4
LT		 1214}
1215
b2174eeb 1216static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1217 void *req)
b2174eeb
HY		 1218{
1219 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1220}
1221
ef43aa38 1222static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1223{
ef43aa38 1224 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1225}
1226
2dc5327d
MB		 1227static u8 *iv_of_dmreq(struct crypt_config *cc,
1228 struct dm_crypt_request *dmreq)
1229{
33d2f09f 1230 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1231 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1232 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1233 else
1234 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1235 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1236}
1237
ef43aa38
MB		 1238static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1239 struct dm_crypt_request *dmreq)
1240{
1241 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1242}
1243
c13b5487 1244static __le64 *org_sector_of_dmreq(struct crypt_config *cc,
ef43aa38
MB		 1245 struct dm_crypt_request *dmreq)
1246{
1247 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
c13b5487 1248 return (__le64 *) ptr;
ef43aa38
MB		 1249}
1250
1251static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1252 struct dm_crypt_request *dmreq)
1253{
1254 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1255 cc->iv_size + sizeof(uint64_t);
1256 return (unsigned int*)ptr;
1257}
1258
1259static void *tag_from_dmreq(struct crypt_config *cc,
1260 struct dm_crypt_request *dmreq)
1261{
1262 struct convert_context *ctx = dmreq->ctx;
1263 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1264
1265 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1266 cc->on_disk_tag_size];
1267}
1268
1269static void *iv_tag_from_dmreq(struct crypt_config *cc,
1270 struct dm_crypt_request *dmreq)
1271{
1272 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1273}
1274
1275static int crypt_convert_block_aead(struct crypt_config *cc,
1276 struct convert_context *ctx,
1277 struct aead_request *req,
1278 unsigned int tag_offset)
01482b76 1279{
003b5c57
KO		 1280 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1281 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1282 struct dm_crypt_request *dmreq;
ef43aa38 1283 u8 *iv, *org_iv, *tag_iv, *tag;
c13b5487 1284 __le64 *sector;
ef43aa38
MB		 1285 int r = 0;
1286
1287 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1288
8f0009a2 1289 /* Reject unexpected unaligned bio. */
0440d5c0 1290 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1291 return -EIO;
3a7f6c99 1292
b2174eeb 1293 dmreq = dmreq_of_req(cc, req);
ef43aa38 1294 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1295 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1296 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1297 dmreq->ctx = ctx;
1298
1299 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1300
1301 sector = org_sector_of_dmreq(cc, dmreq);
1302 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1303
2dc5327d 1304 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1305 org_iv = org_iv_of_dmreq(cc, dmreq);
1306 tag = tag_from_dmreq(cc, dmreq);
1307 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1308
1309 /* AEAD request:
1310 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1311 * | (authenticated) | (auth+encryption) | |
1312 * | sector_LE | IV | sector in/out | tag in/out |
1313 */
1314 sg_init_table(dmreq->sg_in, 4);
1315 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1316 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1317 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1318 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1319
1320 sg_init_table(dmreq->sg_out, 4);
1321 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1322 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1323 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1324 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1325
1326 if (cc->iv_gen_ops) {
1327 /* For READs use IV stored in integrity metadata */
1328 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1329 memcpy(org_iv, tag_iv, cc->iv_size);
1330 } else {
1331 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1332 if (r < 0)
1333 return r;
1334 /* Store generated IV in integrity metadata */
1335 if (cc->integrity_iv_size)
1336 memcpy(tag_iv, org_iv, cc->iv_size);
1337 }
1338 /* Working copy of IV, to be modified in crypto API */
1339 memcpy(iv, org_iv, cc->iv_size);
1340 }
1341
1342 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1343 if (bio_data_dir(ctx->bio_in) == WRITE) {
1344 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1345 cc->sector_size, iv);
ef43aa38
MB		 1346 r = crypto_aead_encrypt(req);
1347 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1348 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1349 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1350 } else {
1351 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1352 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1353 r = crypto_aead_decrypt(req);
1354 }
1355
f710126c
MB		 1356 if (r == -EBADMSG) {
1357 char b[BDEVNAME_SIZE];
1358 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 1359 (unsigned long long)le64_to_cpu(*sector));
f710126c 1360 }
ef43aa38
MB		 1361
1362 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1363 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1364
8f0009a2
MB		 1365 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1366 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1367
ef43aa38
MB		 1368 return r;
1369}
1370
1371static int crypt_convert_block_skcipher(struct crypt_config *cc,
1372 struct convert_context *ctx,
1373 struct skcipher_request *req,
1374 unsigned int tag_offset)
1375{
1376 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1377 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1378 struct scatterlist *sg_in, *sg_out;
1379 struct dm_crypt_request *dmreq;
ef43aa38 1380 u8 *iv, *org_iv, *tag_iv;
c13b5487 1381 __le64 *sector;
ef43aa38 1382 int r = 0;
01482b76 1383
8f0009a2 1384 /* Reject unexpected unaligned bio. */
0440d5c0 1385 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1386 return -EIO;
1387
ef43aa38 1388 dmreq = dmreq_of_req(cc, req);
c66029f4 1389 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1390 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1391 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1392 dmreq->ctx = ctx;
01482b76 1393
ef43aa38
MB		 1394 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1395
1396 iv = iv_of_dmreq(cc, dmreq);
1397 org_iv = org_iv_of_dmreq(cc, dmreq);
1398 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1399
1400 sector = org_sector_of_dmreq(cc, dmreq);
1401 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1402
1403 /* For skcipher we use only the first sg item */
1404 sg_in = &dmreq->sg_in[0];
1405 sg_out = &dmreq->sg_out[0];
01482b76 1406
ef43aa38 1407 sg_init_table(sg_in, 1);
8f0009a2 1408 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1409
1410 sg_init_table(sg_out, 1);
8f0009a2 1411 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1412
3a7f6c99 1413 if (cc->iv_gen_ops) {
ef43aa38
MB		 1414 /* For READs use IV stored in integrity metadata */
1415 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1416 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1417 } else {
1418 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1419 if (r < 0)
1420 return r;
bbb16584
MB		 1421 /* Data can be already preprocessed in generator */
1422 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags))
1423 sg_in = sg_out;
ef43aa38
MB		 1424 /* Store generated IV in integrity metadata */
1425 if (cc->integrity_iv_size)
1426 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1427 }
1428 /* Working copy of IV, to be modified in crypto API */
1429 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1430 }
1431
8f0009a2 1432 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1433
1434 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1435 r = crypto_skcipher_encrypt(req);
3a7f6c99 1436 else
bbdb23b5 1437 r = crypto_skcipher_decrypt(req);
3a7f6c99 1438
2dc5327d 1439 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1440 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1441
8f0009a2
MB		 1442 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1443 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1444
3a7f6c99 1445 return r;
01482b76
MB		 1446}
1447
95497a96
MB		 1448static void kcryptd_async_done(struct crypto_async_request *async_req,
1449 int error);
c0297721 1450
ef43aa38
MB		 1451static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1452 struct convert_context *ctx)
ddd42edf 1453{
c66029f4 1454 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1455
ef43aa38 1456 if (!ctx->r.req)
6f1c819c 1457 ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1458
ef43aa38 1459 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1460
1461 /*
1462 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1463 * requests if driver request queue is full.
1464 */
ef43aa38 1465 skcipher_request_set_callback(ctx->r.req,
432061b3 1466 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1467 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
ddd42edf
MB		 1468}
1469
ef43aa38
MB		 1470static void crypt_alloc_req_aead(struct crypt_config *cc,
1471 struct convert_context *ctx)
1472{
1473 if (!ctx->r.req_aead)
6f1c819c 1474 ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1475
ef43aa38 1476 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1477
1478 /*
1479 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1480 * requests if driver request queue is full.
1481 */
ef43aa38 1482 aead_request_set_callback(ctx->r.req_aead,
432061b3 1483 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38
MB		 1484 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1485}
1486
1487static void crypt_alloc_req(struct crypt_config *cc,
1488 struct convert_context *ctx)
1489{
33d2f09f 1490 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1491 crypt_alloc_req_aead(cc, ctx);
1492 else
1493 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1494}
1495
ef43aa38
MB		 1496static void crypt_free_req_skcipher(struct crypt_config *cc,
1497 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1498{
1499 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1500
bbdb23b5 1501 if ((struct skcipher_request *)(io + 1) != req)
6f1c819c 1502 mempool_free(req, &cc->req_pool);
298a9fa0
MP		 1503}
1504
ef43aa38
MB		 1505static void crypt_free_req_aead(struct crypt_config *cc,
1506 struct aead_request *req, struct bio *base_bio)
1507{
1508 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1509
1510 if ((struct aead_request *)(io + 1) != req)
6f1c819c 1511 mempool_free(req, &cc->req_pool);
ef43aa38
MB		 1512}
1513
1514static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1515{
33d2f09f 1516 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1517 crypt_free_req_aead(cc, req, base_bio);
1518 else
1519 crypt_free_req_skcipher(cc, req, base_bio);
1520}
1521
1da177e4
LT		 1522/*
1523 * Encrypt / decrypt data from one bio to another one (can be the same one)
1524 */
4e4cbee9 1525static blk_status_t crypt_convert(struct crypt_config *cc,
d469f841 1526 struct convert_context *ctx)
1da177e4 1527{
ef43aa38 1528 unsigned int tag_offset = 0;
ff3af92b 1529 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1530 int r;
1da177e4 1531
40b6229b 1532 atomic_set(&ctx->cc_pending, 1);
c8081618 1533
003b5c57 1534 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1535
3a7f6c99 1536 crypt_alloc_req(cc, ctx);
40b6229b 1537 atomic_inc(&ctx->cc_pending);
3f1e9070 1538
33d2f09f 1539 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1540 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1541 else
1542 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1543
1544 switch (r) {
54cea3f6
MB		 1545 /*
1546 * The request was queued by a crypto driver
1547 * but the driver request queue is full, let's wait.
1548 */
3a7f6c99
MB		 1549 case -EBUSY:
1550 wait_for_completion(&ctx->restart);
16735d02 1551 reinit_completion(&ctx->restart);
54cea3f6
MB		 1552 /* fall through */
1553 /*
1554 * The request is queued and processed asynchronously,
1555 * completion function kcryptd_async_done() will be called.
1556 */
c0403ec0 1557 case -EINPROGRESS:
ef43aa38 1558 ctx->r.req = NULL;
8f0009a2 1559 ctx->cc_sector += sector_step;
583fe747 1560 tag_offset++;
3f1e9070 1561 continue;
54cea3f6
MB		 1562 /*
1563 * The request was already processed (synchronously).
1564 */
3a7f6c99 1565 case 0:
40b6229b 1566 atomic_dec(&ctx->cc_pending);
8f0009a2 1567 ctx->cc_sector += sector_step;
583fe747 1568 tag_offset++;
c7f1b204 1569 cond_resched();
3a7f6c99 1570 continue;
ef43aa38
MB		 1571 /*
1572 * There was a data integrity error.
1573 */
1574 case -EBADMSG:
1575 atomic_dec(&ctx->cc_pending);
4e4cbee9 1576 return BLK_STS_PROTECTION;
ef43aa38
MB		 1577 /*
1578 * There was an error while processing the request.
1579 */
3f1e9070 1580 default:
40b6229b 1581 atomic_dec(&ctx->cc_pending);
4e4cbee9 1582 return BLK_STS_IOERR;
3f1e9070 1583 }
1da177e4
LT		 1584 }
1585
3f1e9070 1586 return 0;
1da177e4
LT		 1587}
1588
cf2f1abf
MP		 1589static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1590
1da177e4
LT		 1591/*
1592 * Generate a new unfragmented bio with the given size
586b286b
MS		 1593 * This should never violate the device limitations (but only because
1594 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1595 *
1596 * This function may be called concurrently. If we allocate from the mempool
1597 * concurrently, there is a possibility of deadlock. For example, if we have
1598 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1599 * the mempool concurrently, it may deadlock in a situation where both processes
1600 * have allocated 128 pages and the mempool is exhausted.
1601 *
1602 * In order to avoid this scenario we allocate the pages under a mutex.
1603 *
1604 * In order to not degrade performance with excessive locking, we try
1605 * non-blocking allocations without a mutex first but on failure we fallback
1606 * to blocking allocations with a mutex.
1da177e4 1607 */
cf2f1abf 1608static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1609{
49a8a920 1610 struct crypt_config *cc = io->cc;
8b004457 1611 struct bio *clone;
1da177e4 1612 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1613 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1614 unsigned i, len, remaining_size;
91e10625 1615 struct page *page;
1da177e4 1616
7145c241 1617retry:
d0164adc 1618 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1619 mutex_lock(&cc->bio_alloc_lock);
1620
6f1c819c 1621 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs);
8b004457 1622 if (!clone)
ef43aa38 1623 goto out;
1da177e4 1624
027581f3 1625 clone_init(io, clone);
6a24c718 1626
7145c241
MP		 1627 remaining_size = size;
1628
f97380bc 1629 for (i = 0; i < nr_iovecs; i++) {
6f1c819c 1630 page = mempool_alloc(&cc->page_pool, gfp_mask);
7145c241
MP		 1631 if (!page) {
1632 crypt_free_buffer_pages(cc, clone);
1633 bio_put(clone);
d0164adc 1634 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1635 goto retry;
1636 }
1da177e4 1637
7145c241 1638 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1639
0dae7fe5 1640 bio_add_page(clone, page, len, 0);
1da177e4 1641
7145c241 1642 remaining_size -= len;
1da177e4
LT		 1643 }
1644
ef43aa38
MB		 1645 /* Allocate space for integrity tags */
1646 if (dm_crypt_integrity_io_alloc(io, clone)) {
1647 crypt_free_buffer_pages(cc, clone);
1648 bio_put(clone);
1649 clone = NULL;
1650 }
1651out:
d0164adc 1652 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1653 mutex_unlock(&cc->bio_alloc_lock);
1654
8b004457 1655 return clone;
1da177e4
LT		 1656}
1657
644bd2f0 1658static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1659{
1da177e4 1660 struct bio_vec *bv;
6dc4f100 1661 struct bvec_iter_all iter_all;
1da177e4 1662
2b070cfe 1663 bio_for_each_segment_all(bv, clone, iter_all) {
1da177e4 1664 BUG_ON(!bv->bv_page);
6f1c819c 1665 mempool_free(bv->bv_page, &cc->page_pool);
1da177e4
LT		 1666 }
1667}
1668
298a9fa0
MP		 1669static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1670 struct bio *bio, sector_t sector)
dc440d1e 1671{
49a8a920 1672 io->cc = cc;
dc440d1e
MB		 1673 io->base_bio = bio;
1674 io->sector = sector;
1675 io->error = 0;
ef43aa38
MB		 1676 io->ctx.r.req = NULL;
1677 io->integrity_metadata = NULL;
1678 io->integrity_metadata_from_pool = false;
40b6229b 1679 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1680}
1681
3e1a8bdd
MB		 1682static void crypt_inc_pending(struct dm_crypt_io *io)
1683{
40b6229b 1684 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1685}
1686
1da177e4
LT		 1687/*
1688 * One of the bios was finished. Check for completion of
1689 * the whole request and correctly clean up the buffer.
1690 */
5742fd77 1691static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1692{
49a8a920 1693 struct crypt_config *cc = io->cc;
b35f8caa 1694 struct bio *base_bio = io->base_bio;
4e4cbee9 1695 blk_status_t error = io->error;
1da177e4 1696
40b6229b 1697 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1698 return;
1699
ef43aa38
MB		 1700 if (io->ctx.r.req)
1701 crypt_free_req(cc, io->ctx.r.req, base_bio);
1702
1703 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1704 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1705 else
1706 kfree(io->integrity_metadata);
b35f8caa 1707
4e4cbee9 1708 base_bio->bi_status = error;
4246a0b6 1709 bio_endio(base_bio);
1da177e4
LT		 1710}
1711
1712/*
cabf08e4 1713 * kcryptd/kcryptd_io:
1da177e4
LT		 1714 *
1715 * Needed because it would be very unwise to do decryption in an
23541d2d 1716 * interrupt context.
cabf08e4
MB		 1717 *
1718 * kcryptd performs the actual encryption or decryption.
1719 *
1720 * kcryptd_io performs the IO submission.
1721 *
1722 * They must be separated as otherwise the final stages could be
1723 * starved by new requests which can block in the first stages due
1724 * to memory allocation.
c0297721
AK		 1725 *
1726 * The work is done per CPU global for all dm-crypt instances.
1727 * They should not depend on each other and do not block.
1da177e4 1728 */
4246a0b6 1729static void crypt_endio(struct bio *clone)
8b004457 1730{
028867ac 1731 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1732 struct crypt_config *cc = io->cc;
ee7a491e 1733 unsigned rw = bio_data_dir(clone);
4e4cbee9 1734 blk_status_t error;
8b004457
MB		 1735
1736 /*
6712ecf8 1737 * free the processed pages
8b004457 1738 */
ee7a491e 1739 if (rw == WRITE)
644bd2f0 1740 crypt_free_buffer_pages(cc, clone);
8b004457 1741
4e4cbee9 1742 error = clone->bi_status;
8b004457 1743 bio_put(clone);
8b004457 1744
9b81c842 1745 if (rw == READ && !error) {
ee7a491e
MB		 1746 kcryptd_queue_crypt(io);
1747 return;
1748 }
5742fd77 1749
9b81c842
SL		 1750 if (unlikely(error))
1751 io->error = error;
5742fd77
MB		 1752
1753 crypt_dec_pending(io);
8b004457
MB		 1754}
1755
028867ac 1756static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1757{
49a8a920 1758 struct crypt_config *cc = io->cc;
8b004457
MB		 1759
1760 clone->bi_private = io;
1761 clone->bi_end_io = crypt_endio;
74d46992 1762 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1763 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1764}
1765
20c82538 1766static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1767{
49a8a920 1768 struct crypt_config *cc = io->cc;
8b004457 1769 struct bio *clone;
93e605c2 1770
8b004457 1771 /*
59779079
MS		 1772 * We need the original biovec array in order to decrypt
1773 * the whole bio data *afterwards* -- thanks to immutable
1774 * biovecs we don't need to worry about the block layer
1775 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1776 */
6f1c819c 1777 clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
7eaceacc 1778 if (!clone)
20c82538 1779 return 1;
8b004457 1780
20c82538
MB		 1781 crypt_inc_pending(io);
1782
8b004457 1783 clone_init(io, clone);
4f024f37 1784 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1785
ef43aa38
MB		 1786 if (dm_crypt_integrity_io_alloc(io, clone)) {
1787 crypt_dec_pending(io);
1788 bio_put(clone);
1789 return 1;
1790 }
1791
93e605c2 1792 generic_make_request(clone);
20c82538 1793 return 0;
8b004457
MB		 1794}
1795
dc267621
MP		 1796static void kcryptd_io_read_work(struct work_struct *work)
1797{
1798 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1799
1800 crypt_inc_pending(io);
1801 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1802 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1803 crypt_dec_pending(io);
1804}
1805
1806static void kcryptd_queue_read(struct dm_crypt_io *io)
1807{
1808 struct crypt_config *cc = io->cc;
1809
1810 INIT_WORK(&io->work, kcryptd_io_read_work);
1811 queue_work(cc->io_queue, &io->work);
1812}
1813
4e4eef64
MB		 1814static void kcryptd_io_write(struct dm_crypt_io *io)
1815{
95497a96 1816 struct bio *clone = io->ctx.bio_out;
dc267621 1817
95497a96 1818 generic_make_request(clone);
4e4eef64
MB		 1819}
1820
b3c5fd30
MP		 1821#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1822
dc267621 1823static int dmcrypt_write(void *data)
395b167c 1824{
dc267621 1825 struct crypt_config *cc = data;
b3c5fd30
MP		 1826 struct dm_crypt_io *io;
1827
dc267621 1828 while (1) {
b3c5fd30 1829 struct rb_root write_tree;
dc267621 1830 struct blk_plug plug;
395b167c 1831
c7329eff 1832 spin_lock_irq(&cc->write_thread_lock);
dc267621 1833continue_locked:
395b167c 1834
b3c5fd30 1835 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1836 goto pop_from_list;
1837
f659b100 1838 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1839
c7329eff 1840 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1841
f659b100 1842 if (unlikely(kthread_should_stop())) {
642fa448 1843 set_current_state(TASK_RUNNING);
f659b100
RV		 1844 break;
1845 }
1846
dc267621
MP		 1847 schedule();
1848
642fa448 1849 set_current_state(TASK_RUNNING);
c7329eff 1850 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1851 goto continue_locked;
1852
1853pop_from_list:
b3c5fd30
MP		 1854 write_tree = cc->write_tree;
1855 cc->write_tree = RB_ROOT;
c7329eff 1856 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1857
b3c5fd30
MP		 1858 BUG_ON(rb_parent(write_tree.rb_node));
1859
1860 /*
1861 * Note: we cannot walk the tree here with rb_next because
1862 * the structures may be freed when kcryptd_io_write is called.
1863 */
dc267621
MP		 1864 blk_start_plug(&plug);
1865 do {
b3c5fd30
MP		 1866 io = crypt_io_from_node(rb_first(&write_tree));
1867 rb_erase(&io->rb_node, &write_tree);
dc267621 1868 kcryptd_io_write(io);
b3c5fd30 1869 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1870 blk_finish_plug(&plug);
1871 }
1872 return 0;
395b167c
AK		 1873}
1874
72c6e7af 1875static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1876{
dec1cedf 1877 struct bio *clone = io->ctx.bio_out;
49a8a920 1878 struct crypt_config *cc = io->cc;
dc267621 1879 unsigned long flags;
b3c5fd30
MP		 1880 sector_t sector;
1881 struct rb_node **rbp, *parent;
dec1cedf 1882
4e4cbee9 1883 if (unlikely(io->error)) {
dec1cedf
MB		 1884 crypt_free_buffer_pages(cc, clone);
1885 bio_put(clone);
6c031f41 1886 crypt_dec_pending(io);
dec1cedf
MB		 1887 return;
1888 }
1889
1890 /* crypt_convert should have filled the clone bio */
003b5c57 1891 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1892
4f024f37 1893 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1894
0f5d8e6e
MP		 1895 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1896 generic_make_request(clone);
1897 return;
1898 }
1899
c7329eff
MP		 1900 spin_lock_irqsave(&cc->write_thread_lock, flags);
1901 if (RB_EMPTY_ROOT(&cc->write_tree))
1902 wake_up_process(cc->write_thread);
b3c5fd30
MP		 1903 rbp = &cc->write_tree.rb_node;
1904 parent = NULL;
1905 sector = io->sector;
1906 while (*rbp) {
1907 parent = *rbp;
1908 if (sector < crypt_io_from_node(parent)->sector)
1909 rbp = &(*rbp)->rb_left;
1910 else
1911 rbp = &(*rbp)->rb_right;
1912 }
1913 rb_link_node(&io->rb_node, parent, rbp);
1914 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 1915 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 1916}
1917
fc5a5e9a 1918static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1919{
49a8a920 1920 struct crypt_config *cc = io->cc;
8b004457 1921 struct bio *clone;
c8081618 1922 int crypt_finished;
b635b00e 1923 sector_t sector = io->sector;
4e4cbee9 1924 blk_status_t r;
8b004457 1925
fc5a5e9a
MB		 1926 /*
1927 * Prevent io from disappearing until this function completes.
1928 */
1929 crypt_inc_pending(io);
b635b00e 1930 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1931
cf2f1abf
MP		 1932 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1933 if (unlikely(!clone)) {
4e4cbee9 1934 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 1935 goto dec;
1936 }
c8081618 1937
cf2f1abf
MP		 1938 io->ctx.bio_out = clone;
1939 io->ctx.iter_out = clone->bi_iter;
b635b00e 1940
cf2f1abf 1941 sector += bio_sectors(clone);
93e605c2 1942
cf2f1abf
MP		 1943 crypt_inc_pending(io);
1944 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1945 if (r)
ef43aa38 1946 io->error = r;
cf2f1abf 1947 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1948
cf2f1abf
MP		 1949 /* Encryption was already finished, submit io now */
1950 if (crypt_finished) {
1951 kcryptd_crypt_write_io_submit(io, 0);
1952 io->sector = sector;
93e605c2 1953 }
899c95d3 1954
cf2f1abf 1955dec:
899c95d3 1956 crypt_dec_pending(io);
84131db6
MB		 1957}
1958
72c6e7af 1959static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1960{
5742fd77
MB		 1961 crypt_dec_pending(io);
1962}
1963
4e4eef64 1964static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1965{
49a8a920 1966 struct crypt_config *cc = io->cc;
4e4cbee9 1967 blk_status_t r;
1da177e4 1968
3e1a8bdd 1969 crypt_inc_pending(io);
3a7f6c99 1970
53017030 1971 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1972 io->sector);
1da177e4 1973
5742fd77 1974 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1975 if (r)
ef43aa38 1976 io->error = r;
5742fd77 1977
40b6229b 1978 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1979 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1980
1981 crypt_dec_pending(io);
1da177e4
LT		 1982}
1983
95497a96
MB		 1984static void kcryptd_async_done(struct crypto_async_request *async_req,
1985 int error)
1986{
b2174eeb
HY		 1987 struct dm_crypt_request *dmreq = async_req->data;
1988 struct convert_context *ctx = dmreq->ctx;
95497a96 1989 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1990 struct crypt_config *cc = io->cc;
95497a96 1991
54cea3f6
MB		 1992 /*
1993 * A request from crypto driver backlog is going to be processed now,
1994 * finish the completion and continue in crypt_convert().
1995 * (Callback will be called for the second time for this request.)
1996 */
c0403ec0
RV		 1997 if (error == -EINPROGRESS) {
1998 complete(&ctx->restart);
95497a96 1999 return;
c0403ec0 2000 }
95497a96 2001
2dc5327d 2002 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 2003 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 2004
ef43aa38 2005 if (error == -EBADMSG) {
f710126c
MB		 2006 char b[BDEVNAME_SIZE];
2007 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 2008 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 2009 io->error = BLK_STS_PROTECTION;
ef43aa38 2010 } else if (error < 0)
4e4cbee9 2011 io->error = BLK_STS_IOERR;
72c6e7af 2012
298a9fa0 2013 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 2014
40b6229b 2015 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 2016 return;
95497a96
MB		 2017
2018 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 2019 kcryptd_crypt_read_done(io);
95497a96 2020 else
72c6e7af 2021 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 2022}
2023
395b167c 2024static void kcryptd_crypt(struct work_struct *work)
1da177e4 2025{
028867ac 2026 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 2027
cabf08e4 2028 if (bio_data_dir(io->base_bio) == READ)
395b167c 2029 kcryptd_crypt_read_convert(io);
4e4eef64 2030 else
395b167c 2031 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 2032}
2033
395b167c 2034static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 2035{
49a8a920 2036 struct crypt_config *cc = io->cc;
cabf08e4 2037
395b167c
AK		 2038 INIT_WORK(&io->work, kcryptd_crypt);
2039 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 2040}
2041
ef43aa38 2042static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 2043{
ef43aa38
MB		 2044 if (!cc->cipher_tfm.tfms_aead)
2045 return;
1da177e4 2046
ef43aa38
MB		 2047 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2048 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
2049 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 2050 }
2051
ef43aa38
MB		 2052 kfree(cc->cipher_tfm.tfms_aead);
2053 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 2054}
2055
ef43aa38 2056static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 2057{
d1f96423
MB		 2058 unsigned i;
2059
ef43aa38 2060 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2061 return;
2062
d1f96423 2063 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 2064 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
2065 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
2066 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 2067 }
fd2d231f 2068
ef43aa38
MB		 2069 kfree(cc->cipher_tfm.tfms);
2070 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 2071}
2072
ef43aa38
MB		 2073static void crypt_free_tfms(struct crypt_config *cc)
2074{
33d2f09f 2075 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2076 crypt_free_tfms_aead(cc);
2077 else
2078 crypt_free_tfms_skcipher(cc);
2079}
2080
2081static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 2082{
d1f96423
MB		 2083 unsigned i;
2084 int err;
2085
6396bb22
KC		 2086 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
2087 sizeof(struct crypto_skcipher *),
2088 GFP_KERNEL);
ef43aa38 2089 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2090 return -ENOMEM;
2091
d1f96423 2092 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 2093 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
2094 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
2095 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 2096 crypt_free_tfms(cc);
d1f96423
MB		 2097 return err;
2098 }
2099 }
2100
af331eba
EB		 2101 /*
2102 * dm-crypt performance can vary greatly depending on which crypto
2103 * algorithm implementation is used. Help people debug performance
2104 * problems by logging the ->cra_driver_name.
2105 */
7a1cd723 2106 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2107 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 2108 return 0;
2109}
2110
ef43aa38
MB		 2111static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
2112{
ef43aa38
MB		 2113 int err;
2114
2115 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
2116 if (!cc->cipher_tfm.tfms)
2117 return -ENOMEM;
2118
ef43aa38
MB		 2119 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
2120 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2121 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
2122 crypt_free_tfms(cc);
2123 return err;
2124 }
2125
7a1cd723 2126 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2127 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 2128 return 0;
2129}
2130
2131static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
2132{
33d2f09f 2133 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2134 return crypt_alloc_tfms_aead(cc, ciphermode);
2135 else
2136 return crypt_alloc_tfms_skcipher(cc, ciphermode);
2137}
2138
2139static unsigned crypt_subkey_size(struct crypt_config *cc)
2140{
2141 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
2142}
2143
2144static unsigned crypt_authenckey_size(struct crypt_config *cc)
2145{
2146 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
2147}
2148
2149/*
2150 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
2151 * the key must be for some reason in special format.
2152 * This funcion converts cc->key to this special format.
2153 */
2154static void crypt_copy_authenckey(char *p, const void *key,
2155 unsigned enckeylen, unsigned authkeylen)
2156{
2157 struct crypto_authenc_key_param *param;
2158 struct rtattr *rta;
2159
2160 rta = (struct rtattr *)p;
2161 param = RTA_DATA(rta);
2162 param->enckeylen = cpu_to_be32(enckeylen);
2163 rta->rta_len = RTA_LENGTH(sizeof(*param));
2164 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
2165 p += RTA_SPACE(sizeof(*param));
2166 memcpy(p, key + enckeylen, authkeylen);
2167 p += authkeylen;
2168 memcpy(p, key, enckeylen);
2169}
2170
671ea6b4 2171static int crypt_setkey(struct crypt_config *cc)
c0297721 2172{
da31a078 2173 unsigned subkey_size;
fd2d231f
MP		 2174 int err = 0, i, r;
2175
da31a078 2176 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 2177 subkey_size = crypt_subkey_size(cc);
da31a078 2178
27c70036
MB		 2179 if (crypt_integrity_hmac(cc)) {
2180 if (subkey_size < cc->key_mac_size)
2181 return -EINVAL;
2182
ef43aa38
MB		 2183 crypt_copy_authenckey(cc->authenc_key, cc->key,
2184 subkey_size - cc->key_mac_size,
2185 cc->key_mac_size);
27c70036
MB		 2186 }
2187
fd2d231f 2188 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 2189 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 2190 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2191 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 2192 else if (crypt_integrity_aead(cc))
2193 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2194 cc->key + (i * subkey_size),
2195 subkey_size);
ef43aa38
MB		 2196 else
2197 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
2198 cc->key + (i * subkey_size),
2199 subkey_size);
fd2d231f
MP		 2200 if (r)
2201 err = r;
c0297721
AK		 2202 }
2203
ef43aa38
MB		 2204 if (crypt_integrity_hmac(cc))
2205 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
2206
c0297721
AK		 2207 return err;
2208}
2209
c538f6ec
OK		 2210#ifdef CONFIG_KEYS
2211
027c431c
OK		 2212static bool contains_whitespace(const char *str)
2213{
2214 while (*str)
2215 if (isspace(*str++))
2216 return true;
2217 return false;
2218}
2219
27f5411a
DB		 2220static int set_key_user(struct crypt_config *cc, struct key *key)
2221{
2222 const struct user_key_payload *ukp;
2223
2224 ukp = user_key_payload_locked(key);
2225 if (!ukp)
2226 return -EKEYREVOKED;
2227
2228 if (cc->key_size != ukp->datalen)
2229 return -EINVAL;
2230
2231 memcpy(cc->key, ukp->data, cc->key_size);
2232
2233 return 0;
2234}
2235
2236#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2237static int set_key_encrypted(struct crypt_config *cc, struct key *key)
2238{
2239 const struct encrypted_key_payload *ekp;
2240
2241 ekp = key->payload.data[0];
2242 if (!ekp)
2243 return -EKEYREVOKED;
2244
2245 if (cc->key_size != ekp->decrypted_datalen)
2246 return -EINVAL;
2247
2248 memcpy(cc->key, ekp->decrypted_data, cc->key_size);
2249
2250 return 0;
2251}
2252#endif /* CONFIG_ENCRYPTED_KEYS */
2253
c538f6ec
OK		 2254static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2255{
2256 char *new_key_string, *key_desc;
2257 int ret;
27f5411a 2258 struct key_type *type;
c538f6ec 2259 struct key *key;
27f5411a 2260 int (*set_key)(struct crypt_config *cc, struct key *key);
c538f6ec 2261
027c431c
OK		 2262 /*
2263 * Reject key_string with whitespace. dm core currently lacks code for
2264 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2265 */
2266 if (contains_whitespace(key_string)) {
2267 DMERR("whitespace chars not allowed in key string");
2268 return -EINVAL;
2269 }
2270
c538f6ec
OK		 2271 /* look for next ':' separating key_type from key_description */
2272 key_desc = strpbrk(key_string, ":");
2273 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2274 return -EINVAL;
2275
27f5411a
DB		 2276 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
2277 type = &key_type_logon;
2278 set_key = set_key_user;
2279 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
2280 type = &key_type_user;
2281 set_key = set_key_user;
2282#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2283 } else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
2284 type = &key_type_encrypted;
2285 set_key = set_key_encrypted;
2286#endif
2287 } else {
c538f6ec 2288 return -EINVAL;
27f5411a 2289 }
c538f6ec
OK		 2290
2291 new_key_string = kstrdup(key_string, GFP_KERNEL);
2292 if (!new_key_string)
2293 return -ENOMEM;
2294
27f5411a 2295 key = request_key(type, key_desc + 1, NULL);
c538f6ec
OK		 2296 if (IS_ERR(key)) {
2297 kzfree(new_key_string);
2298 return PTR_ERR(key);
2299 }
2300
f5b0cba8 2301 down_read(&key->sem);
c538f6ec 2302
27f5411a
DB		 2303 ret = set_key(cc, key);
2304 if (ret < 0) {
f5b0cba8 2305 up_read(&key->sem);
c538f6ec
OK		 2306 key_put(key);
2307 kzfree(new_key_string);
27f5411a 2308 return ret;
c538f6ec
OK		 2309 }
2310
f5b0cba8 2311 up_read(&key->sem);
c538f6ec
OK		 2312 key_put(key);
2313
2314 /* clear the flag since following operations may invalidate previously valid key */
2315 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2316
2317 ret = crypt_setkey(cc);
2318
c538f6ec
OK		 2319 if (!ret) {
2320 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2321 kzfree(cc->key_string);
2322 cc->key_string = new_key_string;
2323 } else
2324 kzfree(new_key_string);
2325
2326 return ret;
2327}
2328
2329static int get_key_size(char **key_string)
2330{
2331 char *colon, dummy;
2332 int ret;
2333
2334 if (*key_string[0] != ':')
2335 return strlen(*key_string) >> 1;
2336
2337 /* look for next ':' in key string */
2338 colon = strpbrk(*key_string + 1, ":");
2339 if (!colon)
2340 return -EINVAL;
2341
2342 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2343 return -EINVAL;
2344
2345 *key_string = colon;
2346
2347 /* remaining key string should be :<logon|user>:<key_desc> */
2348
2349 return ret;
2350}
2351
2352#else
2353
2354static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2355{
2356 return -EINVAL;
2357}
2358
2359static int get_key_size(char **key_string)
2360{
2361 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2362}
2363
27f5411a 2364#endif /* CONFIG_KEYS */
c538f6ec 2365
e48d4bbf
MB		 2366static int crypt_set_key(struct crypt_config *cc, char *key)
2367{
de8be5ac
MB		 2368 int r = -EINVAL;
2369 int key_string_len = strlen(key);
2370
69a8cfcd
MB		 2371 /* Hyphen (which gives a key_size of zero) means there is no key. */
2372 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2373 goto out;
e48d4bbf 2374
c538f6ec
OK		 2375 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2376 if (key[0] == ':') {
2377 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2378 goto out;
c538f6ec 2379 }
e48d4bbf 2380
265e9098
OK		 2381 /* clear the flag since following operations may invalidate previously valid key */
2382 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2383
c538f6ec
OK		 2384 /* wipe references to any kernel keyring key */
2385 kzfree(cc->key_string);
2386 cc->key_string = NULL;
2387
e944e03e
AS		 2388 /* Decode key from its hex representation. */
2389 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2390 goto out;
e48d4bbf 2391
671ea6b4 2392 r = crypt_setkey(cc);
265e9098
OK		 2393 if (!r)
2394 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2395
2396out:
2397 /* Hex key string not needed after here, so wipe it. */
2398 memset(key, '0', key_string_len);
2399
2400 return r;
e48d4bbf
MB		 2401}
2402
2403static int crypt_wipe_key(struct crypt_config *cc)
2404{
c82feeec
OK		 2405 int r;
2406
e48d4bbf 2407 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2408 get_random_bytes(&cc->key, cc->key_size);
4a52ffc7
MB		 2409
2410 /* Wipe IV private keys */
2411 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2412 r = cc->iv_gen_ops->wipe(cc);
2413 if (r)
2414 return r;
2415 }
2416
c538f6ec
OK		 2417 kzfree(cc->key_string);
2418 cc->key_string = NULL;
c82feeec
OK		 2419 r = crypt_setkey(cc);
2420 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2421
c82feeec 2422 return r;
e48d4bbf
MB		 2423}
2424
5059353d
MP		 2425static void crypt_calculate_pages_per_client(void)
2426{
ca79b0c2 2427 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2428
2429 if (!dm_crypt_clients_n)
2430 return;
2431
2432 pages /= dm_crypt_clients_n;
2433 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2434 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2435 dm_crypt_pages_per_client = pages;
2436}
2437
2438static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2439{
2440 struct crypt_config *cc = pool_data;
2441 struct page *page;
2442
2443 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2444 likely(gfp_mask & __GFP_NORETRY))
2445 return NULL;
2446
2447 page = alloc_page(gfp_mask);
2448 if (likely(page != NULL))
2449 percpu_counter_add(&cc->n_allocated_pages, 1);
2450
2451 return page;
2452}
2453
2454static void crypt_page_free(void *page, void *pool_data)
2455{
2456 struct crypt_config *cc = pool_data;
2457
2458 __free_page(page);
2459 percpu_counter_sub(&cc->n_allocated_pages, 1);
2460}
2461
28513fcc
MB		 2462static void crypt_dtr(struct dm_target *ti)
2463{
2464 struct crypt_config *cc = ti->private;
2465
2466 ti->private = NULL;
2467
2468 if (!cc)
2469 return;
2470
f659b100 2471 if (cc->write_thread)
dc267621
MP		 2472 kthread_stop(cc->write_thread);
2473
28513fcc
MB		 2474 if (cc->io_queue)
2475 destroy_workqueue(cc->io_queue);
2476 if (cc->crypt_queue)
2477 destroy_workqueue(cc->crypt_queue);
2478
fd2d231f
MP		 2479 crypt_free_tfms(cc);
2480
6f1c819c 2481 bioset_exit(&cc->bs);
28513fcc 2482
6f1c819c
KO		 2483 mempool_exit(&cc->page_pool);
2484 mempool_exit(&cc->req_pool);
2485 mempool_exit(&cc->tag_pool);
2486
d00a11df
KO		 2487 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2488 percpu_counter_destroy(&cc->n_allocated_pages);
2489
28513fcc
MB		 2490 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2491 cc->iv_gen_ops->dtr(cc);
2492
28513fcc
MB		 2493 if (cc->dev)
2494 dm_put_device(ti, cc->dev);
2495
7dbcd137 2496 kzfree(cc->cipher_string);
c538f6ec 2497 kzfree(cc->key_string);
ef43aa38
MB		 2498 kzfree(cc->cipher_auth);
2499 kzfree(cc->authenc_key);
28513fcc 2500
d5ffebdd
MS		 2501 mutex_destroy(&cc->bio_alloc_lock);
2502
28513fcc
MB		 2503 /* Must zero key material before freeing */
2504 kzfree(cc);
5059353d
MP		 2505
2506 spin_lock(&dm_crypt_clients_lock);
2507 WARN_ON(!dm_crypt_clients_n);
2508 dm_crypt_clients_n--;
2509 crypt_calculate_pages_per_client();
2510 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2511}
2512
e889f97a
MB		 2513static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2514{
2515 struct crypt_config *cc = ti->private;
2516
33d2f09f 2517 if (crypt_integrity_aead(cc))
e889f97a
MB		 2518 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2519 else
2520 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2521
e889f97a
MB		 2522 if (cc->iv_size)
2523 /* at least a 64 bit sector number should fit in our buffer */
2524 cc->iv_size = max(cc->iv_size,
2525 (unsigned int)(sizeof(u64) / sizeof(u8)));
2526 else if (ivmode) {
2527 DMWARN("Selected cipher does not support IVs");
2528 ivmode = NULL;
2529 }
2530
2531 /* Choose ivmode, see comments at iv code. */
2532 if (ivmode == NULL)
2533 cc->iv_gen_ops = NULL;
2534 else if (strcmp(ivmode, "plain") == 0)
2535 cc->iv_gen_ops = &crypt_iv_plain_ops;
2536 else if (strcmp(ivmode, "plain64") == 0)
2537 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2538 else if (strcmp(ivmode, "plain64be") == 0)
2539 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2540 else if (strcmp(ivmode, "essiv") == 0)
2541 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2542 else if (strcmp(ivmode, "benbi") == 0)
2543 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2544 else if (strcmp(ivmode, "null") == 0)
2545 cc->iv_gen_ops = &crypt_iv_null_ops;
b9411d73
MB		 2546 else if (strcmp(ivmode, "eboiv") == 0)
2547 cc->iv_gen_ops = &crypt_iv_eboiv_ops;
bbb16584
MB		 2548 else if (strcmp(ivmode, "elephant") == 0) {
2549 cc->iv_gen_ops = &crypt_iv_elephant_ops;
2550 cc->key_parts = 2;
2551 cc->key_extra_size = cc->key_size / 2;
2552 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE)
2553 return -EINVAL;
2554 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags);
2555 } else if (strcmp(ivmode, "lmk") == 0) {
e889f97a
MB		 2556 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2557 /*
2558 * Version 2 and 3 is recognised according
2559 * to length of provided multi-key string.
2560 * If present (version 3), last key is used as IV seed.
2561 * All keys (including IV seed) are always the same size.
2562 */
2563 if (cc->key_size % cc->key_parts) {
2564 cc->key_parts++;
2565 cc->key_extra_size = cc->key_size / cc->key_parts;
2566 }
2567 } else if (strcmp(ivmode, "tcw") == 0) {
2568 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2569 cc->key_parts += 2; /* IV + whitening */
2570 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2571 } else if (strcmp(ivmode, "random") == 0) {
2572 cc->iv_gen_ops = &crypt_iv_random_ops;
2573 /* Need storage space in integrity fields. */
2574 cc->integrity_iv_size = cc->iv_size;
2575 } else {
2576 ti->error = "Invalid IV mode";
2577 return -EINVAL;
2578 }
2579
2580 return 0;
2581}
2582
33d2f09f
MB		 2583/*
2584 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2585 * The HMAC is needed to calculate tag size (HMAC digest size).
2586 * This should be probably done by crypto-api calls (once available...)
2587 */
2588static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2589{
2590 char *start, *end, *mac_alg = NULL;
2591 struct crypto_ahash *mac;
2592
2593 if (!strstarts(cipher_api, "authenc("))
2594 return 0;
2595
2596 start = strchr(cipher_api, '(');
2597 end = strchr(cipher_api, ',');
2598 if (!start || !end || ++start > end)
2599 return -EINVAL;
2600
2601 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2602 if (!mac_alg)
2603 return -ENOMEM;
2604 strncpy(mac_alg, start, end - start);
2605
2606 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2607 kfree(mac_alg);
2608
2609 if (IS_ERR(mac))
2610 return PTR_ERR(mac);
2611
2612 cc->key_mac_size = crypto_ahash_digestsize(mac);
2613 crypto_free_ahash(mac);
2614
2615 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2616 if (!cc->authenc_key)
2617 return -ENOMEM;
2618
2619 return 0;
2620}
2621
2622static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2623 char **ivmode, char **ivopts)
2624{
2625 struct crypt_config *cc = ti->private;
a1a262b6 2626 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME];
33d2f09f
MB		 2627 int ret = -EINVAL;
2628
2629 cc->tfms_count = 1;
2630
2631 /*
2632 * New format (capi: prefix)
2633 * capi:cipher_api_spec-iv:ivopts
2634 */
2635 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2636
2637 /* Separate IV options if present, it can contain another '-' in hash name */
2638 *ivopts = strrchr(tmp, ':');
2639 if (*ivopts) {
2640 **ivopts = '\0';
2641 (*ivopts)++;
2642 }
2643 /* Parse IV mode */
2644 *ivmode = strrchr(tmp, '-');
2645 if (*ivmode) {
2646 **ivmode = '\0';
2647 (*ivmode)++;
2648 }
2649 /* The rest is crypto API spec */
2650 cipher_api = tmp;
33d2f09f 2651
a1a262b6
AB		 2652 /* Alloc AEAD, can be used only in new format. */
2653 if (crypt_integrity_aead(cc)) {
2654 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2655 if (ret < 0) {
2656 ti->error = "Invalid AEAD cipher spec";
2657 return -ENOMEM;
2658 }
2659 }
2660
33d2f09f
MB		 2661 if (*ivmode && !strcmp(*ivmode, "lmk"))
2662 cc->tfms_count = 64;
2663
a1a262b6
AB		 2664 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2665 if (!*ivopts) {
2666 ti->error = "Digest algorithm missing for ESSIV mode";
2667 return -EINVAL;
2668 }
2669 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)",
2670 cipher_api, *ivopts);
2671 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
2672 ti->error = "Cannot allocate cipher string";
2673 return -ENOMEM;
2674 }
2675 cipher_api = buf;
2676 }
2677
33d2f09f
MB		 2678 cc->key_parts = cc->tfms_count;
2679
2680 /* Allocate cipher */
2681 ret = crypt_alloc_tfms(cc, cipher_api);
2682 if (ret < 0) {
2683 ti->error = "Error allocating crypto tfm";
2684 return ret;
2685 }
2686
a1a262b6 2687 if (crypt_integrity_aead(cc))
33d2f09f 2688 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
a1a262b6 2689 else
33d2f09f
MB		 2690 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2691
33d2f09f
MB		 2692 return 0;
2693}
2694
2695static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2696 char **ivmode, char **ivopts)
1da177e4 2697{
5ebaee6d 2698 struct crypt_config *cc = ti->private;
33d2f09f 2699 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2700 char *cipher_api = NULL;
fd2d231f 2701 int ret = -EINVAL;
31998ef1 2702 char dummy;
1da177e4 2703
33d2f09f 2704 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2705 ti->error = "Bad cipher specification";
1da177e4
LT		 2706 return -EINVAL;
2707 }
2708
5ebaee6d
MB		 2709 /*
2710 * Legacy dm-crypt cipher specification
d1f96423 2711 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2712 */
2713 tmp = cipher_in;
d1f96423
MB		 2714 keycount = strsep(&tmp, "-");
2715 cipher = strsep(&keycount, ":");
2716
2717 if (!keycount)
2718 cc->tfms_count = 1;
31998ef1 2719 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2720 !is_power_of_2(cc->tfms_count)) {
2721 ti->error = "Bad cipher key count specification";
2722 return -EINVAL;
2723 }
2724 cc->key_parts = cc->tfms_count;
5ebaee6d 2725
1da177e4 2726 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 2727 *ivmode = strsep(&tmp, ":");
2728 *ivopts = tmp;
1da177e4 2729
7dbcd137
MB		 2730 /*
2731 * For compatibility with the original dm-crypt mapping format, if
2732 * only the cipher name is supplied, use cbc-plain.
2733 */
33d2f09f 2734 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2735 chainmode = "cbc";
33d2f09f 2736 *ivmode = "plain";
1da177e4
LT		 2737 }
2738
33d2f09f 2739 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2740 ti->error = "IV mechanism required";
2741 return -EINVAL;
1da177e4
LT		 2742 }
2743
5ebaee6d
MB		 2744 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2745 if (!cipher_api)
2746 goto bad_mem;
2747
a1a262b6
AB		 2748 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2749 if (!*ivopts) {
2750 ti->error = "Digest algorithm missing for ESSIV mode";
2751 kfree(cipher_api);
2752 return -EINVAL;
2753 }
2754 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2755 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts);
2756 } else {
2757 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2758 "%s(%s)", chainmode, cipher);
2759 }
2760 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
5ebaee6d
MB		 2761 kfree(cipher_api);
2762 goto bad_mem;
1da177e4
LT		 2763 }
2764
5ebaee6d 2765 /* Allocate cipher */
fd2d231f
MP		 2766 ret = crypt_alloc_tfms(cc, cipher_api);
2767 if (ret < 0) {
2768 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2769 kfree(cipher_api);
2770 return ret;
1da177e4 2771 }
bd86e320 2772 kfree(cipher_api);
1da177e4 2773
33d2f09f
MB		 2774 return 0;
2775bad_mem:
2776 ti->error = "Cannot allocate cipher strings";
2777 return -ENOMEM;
2778}
5ebaee6d 2779
33d2f09f
MB		 2780static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2781{
2782 struct crypt_config *cc = ti->private;
2783 char *ivmode = NULL, *ivopts = NULL;
2784 int ret;
2785
2786 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2787 if (!cc->cipher_string) {
2788 ti->error = "Cannot allocate cipher strings";
2789 return -ENOMEM;
1da177e4
LT		 2790 }
2791
33d2f09f
MB		 2792 if (strstarts(cipher_in, "capi:"))
2793 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2794 else
2795 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2796 if (ret)
2797 return ret;
2798
5ebaee6d 2799 /* Initialize IV */
e889f97a
MB		 2800 ret = crypt_ctr_ivmode(ti, ivmode);
2801 if (ret < 0)
33d2f09f 2802 return ret;
1da177e4 2803
da31a078
MB		 2804 /* Initialize and set key */
2805 ret = crypt_set_key(cc, key);
2806 if (ret < 0) {
2807 ti->error = "Error decoding and setting key";
33d2f09f 2808 return ret;
da31a078
MB		 2809 }
2810
28513fcc
MB		 2811 /* Allocate IV */
2812 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2813 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2814 if (ret < 0) {
2815 ti->error = "Error creating IV";
33d2f09f 2816 return ret;
28513fcc
MB		 2817 }
2818 }
1da177e4 2819
28513fcc
MB		 2820 /* Initialize IV (set keys for ESSIV etc) */
2821 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2822 ret = cc->iv_gen_ops->init(cc);
2823 if (ret < 0) {
2824 ti->error = "Error initialising IV";
33d2f09f 2825 return ret;
28513fcc 2826 }
b95bf2d3
MB		 2827 }
2828
dc94902b
OK		 2829 /* wipe the kernel key payload copy */
2830 if (cc->key_string)
2831 memset(cc->key, 0, cc->key_size * sizeof(u8));
2832
5ebaee6d 2833 return ret;
5ebaee6d 2834}
5ebaee6d 2835
ef43aa38
MB		 2836static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2837{
2838 struct crypt_config *cc = ti->private;
2839 struct dm_arg_set as;
5916a22b 2840 static const struct dm_arg _args[] = {
8f0009a2 2841 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2842 };
2843 unsigned int opt_params, val;
2844 const char *opt_string, *sval;
8f0009a2 2845 char dummy;
ef43aa38
MB		 2846 int ret;
2847
2848 /* Optional parameters */
2849 as.argc = argc;
2850 as.argv = argv;
2851
2852 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2853 if (ret)
2854 return ret;
2855
2856 while (opt_params--) {
2857 opt_string = dm_shift_arg(&as);
2858 if (!opt_string) {
2859 ti->error = "Not enough feature arguments";
2860 return -EINVAL;
2861 }
2862
2863 if (!strcasecmp(opt_string, "allow_discards"))
2864 ti->num_discard_bios = 1;
2865
2866 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2867 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2868
2869 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2870 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2871 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2872 if (val == 0 || val > MAX_TAG_SIZE) {
2873 ti->error = "Invalid integrity arguments";
2874 return -EINVAL;
2875 }
2876 cc->on_disk_tag_size = val;
2877 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2878 if (!strcasecmp(sval, "aead")) {
2879 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2880 } else if (strcasecmp(sval, "none")) {
2881 ti->error = "Unknown integrity profile";
2882 return -EINVAL;
2883 }
2884
2885 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2886 if (!cc->cipher_auth)
2887 return -ENOMEM;
ff3af92b 2888 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2889 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2890 cc->sector_size > 4096 ||
ff3af92b 2891 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2892 ti->error = "Invalid feature value for sector_size";
2893 return -EINVAL;
2894 }
783874b0
MB		 2895 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
2896 ti->error = "Device size is not multiple of sector_size feature";
2897 return -EINVAL;
2898 }
ff3af92b 2899 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2900 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2901 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2902 else {
ef43aa38
MB		 2903 ti->error = "Invalid feature arguments";
2904 return -EINVAL;
2905 }
2906 }
2907
2908 return 0;
5ebaee6d
MB		 2909}
2910
2911/*
2912 * Construct an encryption mapping:
c538f6ec 2913 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2914 */
2915static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2916{
2917 struct crypt_config *cc;
ed0302e8 2918 const char *devname = dm_table_device_name(ti->table);
c538f6ec 2919 int key_size;
ef43aa38 2920 unsigned int align_mask;
5ebaee6d
MB		 2921 unsigned long long tmpll;
2922 int ret;
ef43aa38 2923 size_t iv_size_padding, additional_req_size;
31998ef1 2924 char dummy;
772ae5f5 2925
772ae5f5 2926 if (argc < 5) {
5ebaee6d
MB		 2927 ti->error = "Not enough arguments";
2928 return -EINVAL;
1da177e4
LT		 2929 }
2930
c538f6ec
OK		 2931 key_size = get_key_size(&argv[1]);
2932 if (key_size < 0) {
2933 ti->error = "Cannot parse key size";
2934 return -EINVAL;
2935 }
5ebaee6d 2936
9c81c99b 2937 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL);
5ebaee6d
MB		 2938 if (!cc) {
2939 ti->error = "Cannot allocate encryption context";
2940 return -ENOMEM;
2941 }
69a8cfcd 2942 cc->key_size = key_size;
8f0009a2 2943 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2944 cc->sector_shift = 0;
5ebaee6d
MB		 2945
2946 ti->private = cc;
ef43aa38 2947
5059353d
MP		 2948 spin_lock(&dm_crypt_clients_lock);
2949 dm_crypt_clients_n++;
2950 crypt_calculate_pages_per_client();
2951 spin_unlock(&dm_crypt_clients_lock);
2952
2953 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
2954 if (ret < 0)
2955 goto bad;
2956
ef43aa38
MB		 2957 /* Optional parameters need to be read before cipher constructor */
2958 if (argc > 5) {
2959 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2960 if (ret)
2961 goto bad;
2962 }
2963
5ebaee6d
MB		 2964 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2965 if (ret < 0)
2966 goto bad;
2967
33d2f09f 2968 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2969 cc->dmreq_start = sizeof(struct aead_request);
2970 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2971 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2972 } else {
2973 cc->dmreq_start = sizeof(struct skcipher_request);
2974 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2975 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2976 }
d49ec52f
MP		 2977 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2978
ef43aa38 2979 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2980 /* Allocate the padding exactly */
2981 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2982 & align_mask;
d49ec52f
MP		 2983 } else {
2984 /*
2985 * If the cipher requires greater alignment than kmalloc
2986 * alignment, we don't know the exact position of the
2987 * initialization vector. We must assume worst case.
2988 */
ef43aa38 2989 iv_size_padding = align_mask;
d49ec52f 2990 }
ddd42edf 2991
ef43aa38
MB		 2992 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2993 additional_req_size = sizeof(struct dm_crypt_request) +
2994 iv_size_padding + cc->iv_size +
2995 cc->iv_size +
2996 sizeof(uint64_t) +
2997 sizeof(unsigned int);
2998
6f1c819c
KO		 2999 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
3000 if (ret) {
ddd42edf 3001 ti->error = "Cannot allocate crypt request mempool";
28513fcc 3002 goto bad;
ddd42edf 3003 }
ddd42edf 3004
30187e1d 3005 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 3006 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 3007 ARCH_KMALLOC_MINALIGN);
298a9fa0 3008
6f1c819c
KO		 3009 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
3010 if (ret) {
72d94861 3011 ti->error = "Cannot allocate page mempool";
28513fcc 3012 goto bad;
1da177e4
LT		 3013 }
3014
6f1c819c
KO		 3015 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
3016 if (ret) {
6a24c718 3017 ti->error = "Cannot allocate crypt bioset";
28513fcc 3018 goto bad;
6a24c718
MB		 3019 }
3020
7145c241
MP		 3021 mutex_init(&cc->bio_alloc_lock);
3022
28513fcc 3023 ret = -EINVAL;
8f0009a2
MB		 3024 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
3025 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 3026 ti->error = "Invalid iv_offset sector";
28513fcc 3027 goto bad;
1da177e4 3028 }
4ee218cd 3029 cc->iv_offset = tmpll;
1da177e4 3030
e80d1c80
VG		 3031 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
3032 if (ret) {
28513fcc
MB		 3033 ti->error = "Device lookup failed";
3034 goto bad;
3035 }
3036
e80d1c80 3037 ret = -EINVAL;
ef87bfc2 3038 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 3039 ti->error = "Invalid device sector";
28513fcc 3040 goto bad;
1da177e4 3041 }
4ee218cd 3042 cc->start = tmpll;
1da177e4 3043
33d2f09f 3044 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 3045 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 3046 if (ret)
3047 goto bad;
3048
ef43aa38
MB		 3049 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
3050 if (!cc->tag_pool_max_sectors)
3051 cc->tag_pool_max_sectors = 1;
f3396c58 3052
6f1c819c 3053 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 3054 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 3055 if (ret) {
ef43aa38
MB		 3056 ti->error = "Cannot allocate integrity tags mempool";
3057 goto bad;
772ae5f5 3058 }
583fe747
MP		 3059
3060 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 3061 }
3062
28513fcc 3063 ret = -ENOMEM;
f612b213 3064 cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
cabf08e4
MB		 3065 if (!cc->io_queue) {
3066 ti->error = "Couldn't create kcryptd io queue";
28513fcc 3067 goto bad;
cabf08e4
MB		 3068 }
3069
f3396c58 3070 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
f612b213 3071 cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
ed0302e8 3072 1, devname);
f3396c58 3073 else
ed0302e8 3074 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
f612b213 3075 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 3076 num_online_cpus(), devname);
cabf08e4 3077 if (!cc->crypt_queue) {
9934a8be 3078 ti->error = "Couldn't create kcryptd queue";
28513fcc 3079 goto bad;
9934a8be
MB		 3080 }
3081
c7329eff 3082 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 3083 cc->write_tree = RB_ROOT;
dc267621 3084
ed0302e8 3085 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 3086 if (IS_ERR(cc->write_thread)) {
3087 ret = PTR_ERR(cc->write_thread);
3088 cc->write_thread = NULL;
3089 ti->error = "Couldn't spawn write thread";
3090 goto bad;
3091 }
3092 wake_up_process(cc->write_thread);
3093
55a62eef 3094 ti->num_flush_bios = 1;
983c7db3 3095
1da177e4
LT		 3096 return 0;
3097
28513fcc
MB		 3098bad:
3099 crypt_dtr(ti);
3100 return ret;
1da177e4
LT		 3101}
3102
7de3ee57 3103static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 3104{
028867ac 3105 struct dm_crypt_io *io;
49a8a920 3106 struct crypt_config *cc = ti->private;
647c7db1 3107
772ae5f5 3108 /*
28a8f0d3
MC		 3109 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
3110 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 3111 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 3112 */
1eff9d32 3113 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 3114 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 3115 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 3116 if (bio_sectors(bio))
4f024f37
KO		 3117 bio->bi_iter.bi_sector = cc->start +
3118 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 3119 return DM_MAPIO_REMAPPED;
3120 }
1da177e4 3121
4e870e94
MP		 3122 /*
3123 * Check if bio is too large, split as needed.
3124 */
3125 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 3126 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 3127 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
3128
8f0009a2
MB		 3129 /*
3130 * Ensure that bio is a multiple of internal sector encryption size
3131 * and is aligned to this size as defined in IO hints.
3132 */
3133 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 3134 return DM_MAPIO_KILL;
8f0009a2
MB		 3135
3136 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 3137 return DM_MAPIO_KILL;
8f0009a2 3138
298a9fa0
MP		 3139 io = dm_per_bio_data(bio, cc->per_bio_data_size);
3140 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 3141
3142 if (cc->on_disk_tag_size) {
583fe747 3143 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 3144
3145 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 3146 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 3147 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
3148 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
3149 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 3150 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 3151 io->integrity_metadata_from_pool = true;
3152 }
3153 }
3154
33d2f09f 3155 if (crypt_integrity_aead(cc))
ef43aa38
MB		 3156 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
3157 else
3158 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 3159
20c82538
MB		 3160 if (bio_data_dir(io->base_bio) == READ) {
3161 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 3162 kcryptd_queue_read(io);
20c82538 3163 } else
cabf08e4 3164 kcryptd_queue_crypt(io);
1da177e4 3165
d2a7ad29 3166 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 3167}
3168
fd7c092e
MP		 3169static void crypt_status(struct dm_target *ti, status_type_t type,
3170 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 3171{
5ebaee6d 3172 struct crypt_config *cc = ti->private;
fd7c092e 3173 unsigned i, sz = 0;
f3396c58 3174 int num_feature_args = 0;
1da177e4
LT		 3175
3176 switch (type) {
3177 case STATUSTYPE_INFO:
3178 result[0] = '\0';
3179 break;
3180
3181 case STATUSTYPE_TABLE:
7dbcd137 3182 DMEMIT("%s ", cc->cipher_string);
1da177e4 3183
c538f6ec
OK		 3184 if (cc->key_size > 0) {
3185 if (cc->key_string)
3186 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
3187 else
3188 for (i = 0; i < cc->key_size; i++)
3189 DMEMIT("%02x", cc->key[i]);
3190 } else
fd7c092e 3191 DMEMIT("-");
1da177e4 3192
4ee218cd
AM		 3193 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
3194 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 3195
f3396c58
MP		 3196 num_feature_args += !!ti->num_discard_bios;
3197 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 3198 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 3199 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 3200 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 3201 if (cc->on_disk_tag_size)
3202 num_feature_args++;
f3396c58
MP		 3203 if (num_feature_args) {
3204 DMEMIT(" %d", num_feature_args);
3205 if (ti->num_discard_bios)
3206 DMEMIT(" allow_discards");
3207 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
3208 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 3209 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
3210 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 3211 if (cc->on_disk_tag_size)
3212 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 3213 if (cc->sector_size != (1 << SECTOR_SHIFT))
3214 DMEMIT(" sector_size:%d", cc->sector_size);
3215 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
3216 DMEMIT(" iv_large_sectors");
f3396c58 3217 }
772ae5f5 3218
1da177e4
LT		 3219 break;
3220 }
1da177e4
LT		 3221}
3222
e48d4bbf
MB		 3223static void crypt_postsuspend(struct dm_target *ti)
3224{
3225 struct crypt_config *cc = ti->private;
3226
3227 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3228}
3229
3230static int crypt_preresume(struct dm_target *ti)
3231{
3232 struct crypt_config *cc = ti->private;
3233
3234 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3235 DMERR("aborting resume - crypt key is not set.");
3236 return -EAGAIN;
3237 }
3238
3239 return 0;
3240}
3241
3242static void crypt_resume(struct dm_target *ti)
3243{
3244 struct crypt_config *cc = ti->private;
3245
3246 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3247}
3248
3249/* Message interface
3250 * key set <key>
3251 * key wipe
3252 */
1eb5fa84
MS		 3253static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3254 char *result, unsigned maxlen)
e48d4bbf
MB		 3255{
3256 struct crypt_config *cc = ti->private;
c538f6ec 3257 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3258
3259 if (argc < 2)
3260 goto error;
3261
498f0103 3262 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3263 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3264 DMWARN("not suspended during key manipulation.");
3265 return -EINVAL;
3266 }
498f0103 3267 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3268 /* The key size may not be changed. */
3269 key_size = get_key_size(&argv[2]);
3270 if (key_size < 0 || cc->key_size != key_size) {
3271 memset(argv[2], '0', strlen(argv[2]));
3272 return -EINVAL;
3273 }
3274
542da317
MB		 3275 ret = crypt_set_key(cc, argv[2]);
3276 if (ret)
3277 return ret;
3278 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3279 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3280 /* wipe the kernel key payload copy */
3281 if (cc->key_string)
3282 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3283 return ret;
3284 }
4a52ffc7 3285 if (argc == 2 && !strcasecmp(argv[1], "wipe"))
e48d4bbf
MB		 3286 return crypt_wipe_key(cc);
3287 }
3288
3289error:
3290 DMWARN("unrecognised message received.");
3291 return -EINVAL;
3292}
3293
af4874e0
MS		 3294static int crypt_iterate_devices(struct dm_target *ti,
3295 iterate_devices_callout_fn fn, void *data)
3296{
3297 struct crypt_config *cc = ti->private;
3298
5dea271b 3299 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3300}
3301
586b286b
MS		 3302static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3303{
8f0009a2
MB		 3304 struct crypt_config *cc = ti->private;
3305
586b286b
MS		 3306 /*
3307 * Unfortunate constraint that is required to avoid the potential
3308 * for exceeding underlying device's max_segments limits -- due to
3309 * crypt_alloc_buffer() possibly allocating pages for the encryption
3310 * bio that are not as physically contiguous as the original bio.
3311 */
3312 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3313
bc9e9cf0 3314 limits->logical_block_size =
64611a15 3315 max_t(unsigned, limits->logical_block_size, cc->sector_size);
bc9e9cf0
MP		 3316 limits->physical_block_size =
3317 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3318 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3319}
3320
1da177e4
LT		 3321static struct target_type crypt_target = {
3322 .name = "crypt",
27f5411a 3323 .version = {1, 21, 0},
1da177e4
LT		 3324 .module = THIS_MODULE,
3325 .ctr = crypt_ctr,
3326 .dtr = crypt_dtr,
3327 .map = crypt_map,
3328 .status = crypt_status,
e48d4bbf
MB		 3329 .postsuspend = crypt_postsuspend,
3330 .preresume = crypt_preresume,
3331 .resume = crypt_resume,
3332 .message = crypt_message,
af4874e0 3333 .iterate_devices = crypt_iterate_devices,
586b286b 3334 .io_hints = crypt_io_hints,
1da177e4
LT		 3335};
3336
3337static int __init dm_crypt_init(void)
3338{
3339 int r;
3340
1da177e4 3341 r = dm_register_target(&crypt_target);
94f5e024 3342 if (r < 0)
72d94861 3343 DMERR("register failed %d", r);
1da177e4 3344
1da177e4
LT		 3345 return r;
3346}
3347
3348static void __exit dm_crypt_exit(void)
3349{
10d3bd09 3350 dm_unregister_target(&crypt_target);
1da177e4
LT		 3351}
3352
3353module_init(dm_crypt_init);
3354module_exit(dm_crypt_exit);
3355
bf14299f 3356MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3357MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3358MODULE_LICENSE("GPL");
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