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mm: convert zone->managed_pages to atomic variable
[linux-2.6-block.git] / drivers / md / dm-crypt.c
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1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
ef43aa38
MB		 4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 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 */
c538f6ec 37#include <keys/user-type.h>
1da177e4 38
586e80e6 39#include <linux/device-mapper.h>
1da177e4 40
72d94861 41#define DM_MSG_PREFIX "crypt"
1da177e4 42
1da177e4
LT		 43/*
44 * context holding the current state of a multi-part conversion
45 */
46struct convert_context {
43d69034 47 struct completion restart;
1da177e4
LT		 48 struct bio *bio_in;
49 struct bio *bio_out;
003b5c57
KO		 50 struct bvec_iter iter_in;
51 struct bvec_iter iter_out;
c66029f4 52 sector_t cc_sector;
40b6229b 53 atomic_t cc_pending;
ef43aa38
MB		 54 union {
55 struct skcipher_request *req;
56 struct aead_request *req_aead;
57 } r;
58
1da177e4
LT		 59};
60
53017030
MB		 61/*
62 * per bio private data
63 */
64struct dm_crypt_io {
49a8a920 65 struct crypt_config *cc;
53017030 66 struct bio *base_bio;
ef43aa38
MB		 67 u8 *integrity_metadata;
68 bool integrity_metadata_from_pool;
53017030
MB		 69 struct work_struct work;
70
71 struct convert_context ctx;
72
40b6229b 73 atomic_t io_pending;
4e4cbee9 74 blk_status_t error;
0c395b0f 75 sector_t sector;
dc267621 76
b3c5fd30 77 struct rb_node rb_node;
298a9fa0 78} CRYPTO_MINALIGN_ATTR;
53017030 79
01482b76 80struct dm_crypt_request {
b2174eeb 81 struct convert_context *ctx;
ef43aa38
MB		 82 struct scatterlist sg_in[4];
83 struct scatterlist sg_out[4];
2dc5327d 84 sector_t iv_sector;
01482b76
MB		 85};
86
1da177e4
LT		 87struct crypt_config;
88
89struct crypt_iv_operations {
90 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 91 const char *opts);
1da177e4 92 void (*dtr)(struct crypt_config *cc);
b95bf2d3 93 int (*init)(struct crypt_config *cc);
542da317 94 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 95 int (*generator)(struct crypt_config *cc, u8 *iv,
96 struct dm_crypt_request *dmreq);
97 int (*post)(struct crypt_config *cc, u8 *iv,
98 struct dm_crypt_request *dmreq);
1da177e4
LT		 99};
100
60473592 101struct iv_essiv_private {
c07c88f5 102 struct crypto_shash *hash_tfm;
b95bf2d3 103 u8 *salt;
60473592
MB		 104};
105
106struct iv_benbi_private {
107 int shift;
108};
109
34745785
MB		 110#define LMK_SEED_SIZE 64 /* hash + 0 */
111struct iv_lmk_private {
112 struct crypto_shash *hash_tfm;
113 u8 *seed;
114};
115
ed04d981
MB		 116#define TCW_WHITENING_SIZE 16
117struct iv_tcw_private {
118 struct crypto_shash *crc32_tfm;
119 u8 *iv_seed;
120 u8 *whitening;
121};
122
1da177e4
LT		 123/*
124 * Crypt: maps a linear range of a block device
125 * and encrypts / decrypts at the same time.
126 */
0f5d8e6e 127enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
f659b100 128 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
c0297721 129
ef43aa38
MB		 130enum cipher_flags {
131 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */
8f0009a2 132 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */
ef43aa38
MB		 133};
134
c0297721 135/*
610f2de3 136 * The fields in here must be read only after initialization.
c0297721 137 */
1da177e4
LT		 138struct crypt_config {
139 struct dm_dev *dev;
140 sector_t start;
141
5059353d
MP		 142 struct percpu_counter n_allocated_pages;
143
cabf08e4
MB		 144 struct workqueue_struct *io_queue;
145 struct workqueue_struct *crypt_queue;
3f1e9070 146
c7329eff 147 spinlock_t write_thread_lock;
72d711c8 148 struct task_struct *write_thread;
b3c5fd30 149 struct rb_root write_tree;
dc267621 150
5ebaee6d 151 char *cipher;
7dbcd137 152 char *cipher_string;
ef43aa38 153 char *cipher_auth;
c538f6ec 154 char *key_string;
5ebaee6d 155
1b1b58f5 156 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 157 union {
60473592
MB		 158 struct iv_essiv_private essiv;
159 struct iv_benbi_private benbi;
34745785 160 struct iv_lmk_private lmk;
ed04d981 161 struct iv_tcw_private tcw;
79066ad3 162 } iv_gen_private;
1da177e4
LT		 163 sector_t iv_offset;
164 unsigned int iv_size;
ff3af92b
MP		 165 unsigned short int sector_size;
166 unsigned char sector_shift;
1da177e4 167
fd2d231f
MP		 168 /* ESSIV: struct crypto_cipher *essiv_tfm */
169 void *iv_private;
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) */
1da177e4
LT		 217 u8 key[0];
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
c0297721 235/*
86f917ad 236 * Use this to access cipher attributes that are independent of the key.
c0297721 237 */
bbdb23b5 238static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 239{
ef43aa38
MB		 240 return cc->cipher_tfm.tfms[0];
241}
242
243static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
244{
245 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 246}
247
1da177e4
LT		 248/*
249 * Different IV generation algorithms:
250 *
3c164bd8 251 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 252 * number, padded with zeros if necessary.
1da177e4 253 *
61afef61
MB		 254 * plain64: the initial vector is the 64-bit little-endian version of the sector
255 * number, padded with zeros if necessary.
256 *
7e3fd855
MB		 257 * plain64be: the initial vector is the 64-bit big-endian version of the sector
258 * number, padded with zeros if necessary.
259 *
3c164bd8
RS		 260 * essiv: "encrypted sector|salt initial vector", the sector number is
261 * encrypted with the bulk cipher using a salt as key. The salt
262 * should be derived from the bulk cipher's key via hashing.
1da177e4 263 *
48527fa7
RS		 264 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
265 * (needed for LRW-32-AES and possible other narrow block modes)
266 *
46b47730
LN		 267 * null: the initial vector is always zero. Provides compatibility with
268 * obsolete loop_fish2 devices. Do not use for new devices.
269 *
34745785
MB		 270 * lmk: Compatible implementation of the block chaining mode used
271 * by the Loop-AES block device encryption system
272 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
273 * It operates on full 512 byte sectors and uses CBC
274 * with an IV derived from the sector number, the data and
275 * optionally extra IV seed.
276 * This means that after decryption the first block
277 * of sector must be tweaked according to decrypted data.
278 * Loop-AES can use three encryption schemes:
279 * version 1: is plain aes-cbc mode
280 * version 2: uses 64 multikey scheme with lmk IV generator
281 * version 3: the same as version 2 with additional IV seed
282 * (it uses 65 keys, last key is used as IV seed)
283 *
ed04d981
MB		 284 * tcw: Compatible implementation of the block chaining mode used
285 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 286 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 287 * It operates on full 512 byte sectors and uses CBC
288 * with an IV derived from initial key and the sector number.
289 * In addition, whitening value is applied on every sector, whitening
290 * is calculated from initial key, sector number and mixed using CRC32.
291 * Note that this encryption scheme is vulnerable to watermarking attacks
292 * and should be used for old compatible containers access only.
293 *
1da177e4
LT		 294 * plumb: unimplemented, see:
295 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
296 */
297
2dc5327d
MB		 298static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
299 struct dm_crypt_request *dmreq)
1da177e4
LT		 300{
301 memset(iv, 0, cc->iv_size);
283a8328 302 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 303
304 return 0;
305}
306
61afef61 307static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 308 struct dm_crypt_request *dmreq)
61afef61
MB		 309{
310 memset(iv, 0, cc->iv_size);
283a8328 311 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 312
313 return 0;
314}
315
7e3fd855
MB		 316static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv,
317 struct dm_crypt_request *dmreq)
318{
319 memset(iv, 0, cc->iv_size);
320 /* iv_size is at least of size u64; usually it is 16 bytes */
321 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector);
322
323 return 0;
324}
325
b95bf2d3
MB		 326/* Initialise ESSIV - compute salt but no local memory allocations */
327static int crypt_iv_essiv_init(struct crypt_config *cc)
328{
329 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
c07c88f5 330 SHASH_DESC_ON_STACK(desc, essiv->hash_tfm);
c0297721 331 struct crypto_cipher *essiv_tfm;
fd2d231f 332 int err;
b95bf2d3 333
c07c88f5 334 desc->tfm = essiv->hash_tfm;
432061b3 335 desc->flags = 0;
b95bf2d3 336
c07c88f5
KC		 337 err = crypto_shash_digest(desc, cc->key, cc->key_size, essiv->salt);
338 shash_desc_zero(desc);
b95bf2d3
MB		 339 if (err)
340 return err;
341
fd2d231f 342 essiv_tfm = cc->iv_private;
c0297721 343
fd2d231f 344 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
c07c88f5 345 crypto_shash_digestsize(essiv->hash_tfm));
fd2d231f
MP		 346 if (err)
347 return err;
c0297721
AK		 348
349 return 0;
b95bf2d3
MB		 350}
351
542da317
MB		 352/* Wipe salt and reset key derived from volume key */
353static int crypt_iv_essiv_wipe(struct crypt_config *cc)
354{
355 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
c07c88f5 356 unsigned salt_size = crypto_shash_digestsize(essiv->hash_tfm);
c0297721 357 struct crypto_cipher *essiv_tfm;
fd2d231f 358 int r, err = 0;
542da317
MB		 359
360 memset(essiv->salt, 0, salt_size);
361
fd2d231f
MP		 362 essiv_tfm = cc->iv_private;
363 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
364 if (r)
365 err = r;
c0297721
AK		 366
367 return err;
368}
369
86f917ad
EB		 370/* Allocate the cipher for ESSIV */
371static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc,
372 struct dm_target *ti,
373 const u8 *salt,
374 unsigned int saltsize)
c0297721
AK		 375{
376 struct crypto_cipher *essiv_tfm;
377 int err;
378
379 /* Setup the essiv_tfm with the given salt */
1ad0f160 380 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, 0);
c0297721
AK		 381 if (IS_ERR(essiv_tfm)) {
382 ti->error = "Error allocating crypto tfm for ESSIV";
383 return essiv_tfm;
384 }
385
ef43aa38 386 if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) {
c0297721
AK		 387 ti->error = "Block size of ESSIV cipher does "
388 "not match IV size of block cipher";
389 crypto_free_cipher(essiv_tfm);
390 return ERR_PTR(-EINVAL);
391 }
392
393 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
394 if (err) {
395 ti->error = "Failed to set key for ESSIV cipher";
396 crypto_free_cipher(essiv_tfm);
397 return ERR_PTR(err);
398 }
399
400 return essiv_tfm;
542da317
MB		 401}
402
60473592
MB		 403static void crypt_iv_essiv_dtr(struct crypt_config *cc)
404{
c0297721 405 struct crypto_cipher *essiv_tfm;
60473592
MB		 406 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
407
c07c88f5 408 crypto_free_shash(essiv->hash_tfm);
b95bf2d3
MB		 409 essiv->hash_tfm = NULL;
410
411 kzfree(essiv->salt);
412 essiv->salt = NULL;
c0297721 413
fd2d231f 414 essiv_tfm = cc->iv_private;
c0297721 415
fd2d231f
MP		 416 if (essiv_tfm)
417 crypto_free_cipher(essiv_tfm);
c0297721 418
fd2d231f 419 cc->iv_private = NULL;
60473592
MB		 420}
421
1da177e4 422static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
d469f841 423 const char *opts)
1da177e4 424{
5861f1be 425 struct crypto_cipher *essiv_tfm = NULL;
c07c88f5 426 struct crypto_shash *hash_tfm = NULL;
5861f1be 427 u8 *salt = NULL;
fd2d231f 428 int err;
1da177e4 429
5861f1be 430 if (!opts) {
72d94861 431 ti->error = "Digest algorithm missing for ESSIV mode";
1da177e4
LT		 432 return -EINVAL;
433 }
434
b95bf2d3 435 /* Allocate hash algorithm */
c07c88f5 436 hash_tfm = crypto_alloc_shash(opts, 0, 0);
35058687 437 if (IS_ERR(hash_tfm)) {
72d94861 438 ti->error = "Error initializing ESSIV hash";
5861f1be
MB		 439 err = PTR_ERR(hash_tfm);
440 goto bad;
1da177e4
LT		 441 }
442
c07c88f5 443 salt = kzalloc(crypto_shash_digestsize(hash_tfm), GFP_KERNEL);
5861f1be 444 if (!salt) {
72d94861 445 ti->error = "Error kmallocing salt storage in ESSIV";
5861f1be
MB		 446 err = -ENOMEM;
447 goto bad;
1da177e4
LT		 448 }
449
b95bf2d3 450 cc->iv_gen_private.essiv.salt = salt;
b95bf2d3
MB		 451 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
452
86f917ad 453 essiv_tfm = alloc_essiv_cipher(cc, ti, salt,
c07c88f5 454 crypto_shash_digestsize(hash_tfm));
fd2d231f
MP		 455 if (IS_ERR(essiv_tfm)) {
456 crypt_iv_essiv_dtr(cc);
457 return PTR_ERR(essiv_tfm);
c0297721 458 }
fd2d231f 459 cc->iv_private = essiv_tfm;
c0297721 460
1da177e4 461 return 0;
5861f1be
MB		 462
463bad:
5861f1be 464 if (hash_tfm && !IS_ERR(hash_tfm))
c07c88f5 465 crypto_free_shash(hash_tfm);
b95bf2d3 466 kfree(salt);
5861f1be 467 return err;
1da177e4
LT		 468}
469
2dc5327d
MB		 470static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
471 struct dm_crypt_request *dmreq)
1da177e4 472{
fd2d231f 473 struct crypto_cipher *essiv_tfm = cc->iv_private;
c0297721 474
1da177e4 475 memset(iv, 0, cc->iv_size);
283a8328 476 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721
AK		 477 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
478
1da177e4
LT		 479 return 0;
480}
481
48527fa7
RS		 482static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
483 const char *opts)
484{
bbdb23b5 485 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
f0d1b0b3 486 int log = ilog2(bs);
48527fa7
RS		 487
488 /* we need to calculate how far we must shift the sector count
489 * to get the cipher block count, we use this shift in _gen */
490
491 if (1 << log != bs) {
492 ti->error = "cypher blocksize is not a power of 2";
493 return -EINVAL;
494 }
495
496 if (log > 9) {
497 ti->error = "cypher blocksize is > 512";
498 return -EINVAL;
499 }
500
60473592 501 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 502
503 return 0;
504}
505
506static void crypt_iv_benbi_dtr(struct crypt_config *cc)
507{
48527fa7
RS		 508}
509
2dc5327d
MB		 510static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
511 struct dm_crypt_request *dmreq)
48527fa7 512{
79066ad3
HX		 513 __be64 val;
514
48527fa7 515 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 516
2dc5327d 517 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 518 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 519
1da177e4
LT		 520 return 0;
521}
522
2dc5327d
MB		 523static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
524 struct dm_crypt_request *dmreq)
46b47730
LN		 525{
526 memset(iv, 0, cc->iv_size);
527
528 return 0;
529}
530
34745785
MB		 531static void crypt_iv_lmk_dtr(struct crypt_config *cc)
532{
533 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
534
535 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
536 crypto_free_shash(lmk->hash_tfm);
537 lmk->hash_tfm = NULL;
538
539 kzfree(lmk->seed);
540 lmk->seed = NULL;
541}
542
543static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
544 const char *opts)
545{
546 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
547
8f0009a2
MB		 548 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
549 ti->error = "Unsupported sector size for LMK";
550 return -EINVAL;
551 }
552
34745785
MB		 553 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
554 if (IS_ERR(lmk->hash_tfm)) {
555 ti->error = "Error initializing LMK hash";
556 return PTR_ERR(lmk->hash_tfm);
557 }
558
559 /* No seed in LMK version 2 */
560 if (cc->key_parts == cc->tfms_count) {
561 lmk->seed = NULL;
562 return 0;
563 }
564
565 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
566 if (!lmk->seed) {
567 crypt_iv_lmk_dtr(cc);
568 ti->error = "Error kmallocing seed storage in LMK";
569 return -ENOMEM;
570 }
571
572 return 0;
573}
574
575static int crypt_iv_lmk_init(struct crypt_config *cc)
576{
577 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
578 int subkey_size = cc->key_size / cc->key_parts;
579
580 /* LMK seed is on the position of LMK_KEYS + 1 key */
581 if (lmk->seed)
582 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
583 crypto_shash_digestsize(lmk->hash_tfm));
584
585 return 0;
586}
587
588static int crypt_iv_lmk_wipe(struct crypt_config *cc)
589{
590 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
591
592 if (lmk->seed)
593 memset(lmk->seed, 0, LMK_SEED_SIZE);
594
595 return 0;
596}
597
598static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
599 struct dm_crypt_request *dmreq,
600 u8 *data)
601{
602 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 603 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 604 struct md5_state md5state;
da31a078 605 __le32 buf[4];
34745785
MB		 606 int i, r;
607
b6106265 608 desc->tfm = lmk->hash_tfm;
432061b3 609 desc->flags = 0;
34745785 610
b6106265 611 r = crypto_shash_init(desc);
34745785
MB		 612 if (r)
613 return r;
614
615 if (lmk->seed) {
b6106265 616 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 617 if (r)
618 return r;
619 }
620
621 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 622 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 623 if (r)
624 return r;
625
626 /* Sector is cropped to 56 bits here */
627 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
628 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
629 buf[2] = cpu_to_le32(4024);
630 buf[3] = 0;
b6106265 631 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 632 if (r)
633 return r;
634
635 /* No MD5 padding here */
b6106265 636 r = crypto_shash_export(desc, &md5state);
34745785
MB		 637 if (r)
638 return r;
639
640 for (i = 0; i < MD5_HASH_WORDS; i++)
641 __cpu_to_le32s(&md5state.hash[i]);
642 memcpy(iv, &md5state.hash, cc->iv_size);
643
644 return 0;
645}
646
647static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
648 struct dm_crypt_request *dmreq)
649{
ef43aa38 650 struct scatterlist *sg;
34745785
MB		 651 u8 *src;
652 int r = 0;
653
654 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 655 sg = crypt_get_sg_data(cc, dmreq->sg_in);
656 src = kmap_atomic(sg_page(sg));
657 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 658 kunmap_atomic(src);
34745785
MB		 659 } else
660 memset(iv, 0, cc->iv_size);
661
662 return r;
663}
664
665static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
666 struct dm_crypt_request *dmreq)
667{
ef43aa38 668 struct scatterlist *sg;
34745785
MB		 669 u8 *dst;
670 int r;
671
672 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
673 return 0;
674
ef43aa38
MB		 675 sg = crypt_get_sg_data(cc, dmreq->sg_out);
676 dst = kmap_atomic(sg_page(sg));
677 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 678
679 /* Tweak the first block of plaintext sector */
680 if (!r)
ef43aa38 681 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 682
c2e022cb 683 kunmap_atomic(dst);
34745785
MB		 684 return r;
685}
686
ed04d981
MB		 687static void crypt_iv_tcw_dtr(struct crypt_config *cc)
688{
689 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
690
691 kzfree(tcw->iv_seed);
692 tcw->iv_seed = NULL;
693 kzfree(tcw->whitening);
694 tcw->whitening = NULL;
695
696 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
697 crypto_free_shash(tcw->crc32_tfm);
698 tcw->crc32_tfm = NULL;
699}
700
701static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
702 const char *opts)
703{
704 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
705
8f0009a2
MB		 706 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
707 ti->error = "Unsupported sector size for TCW";
708 return -EINVAL;
709 }
710
ed04d981
MB		 711 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
712 ti->error = "Wrong key size for TCW";
713 return -EINVAL;
714 }
715
716 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
717 if (IS_ERR(tcw->crc32_tfm)) {
718 ti->error = "Error initializing CRC32 in TCW";
719 return PTR_ERR(tcw->crc32_tfm);
720 }
721
722 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
723 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
724 if (!tcw->iv_seed || !tcw->whitening) {
725 crypt_iv_tcw_dtr(cc);
726 ti->error = "Error allocating seed storage in TCW";
727 return -ENOMEM;
728 }
729
730 return 0;
731}
732
733static int crypt_iv_tcw_init(struct crypt_config *cc)
734{
735 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
736 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
737
738 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
739 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
740 TCW_WHITENING_SIZE);
741
742 return 0;
743}
744
745static int crypt_iv_tcw_wipe(struct crypt_config *cc)
746{
747 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
748
749 memset(tcw->iv_seed, 0, cc->iv_size);
750 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
751
752 return 0;
753}
754
755static int crypt_iv_tcw_whitening(struct crypt_config *cc,
756 struct dm_crypt_request *dmreq,
757 u8 *data)
758{
759 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 760 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 761 u8 buf[TCW_WHITENING_SIZE];
b6106265 762 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 763 int i, r;
764
765 /* xor whitening with sector number */
45fe93df
AB		 766 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
767 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 768
769 /* calculate crc32 for every 32bit part and xor it */
b6106265 770 desc->tfm = tcw->crc32_tfm;
432061b3 771 desc->flags = 0;
ed04d981 772 for (i = 0; i < 4; i++) {
b6106265 773 r = crypto_shash_init(desc);
ed04d981
MB		 774 if (r)
775 goto out;
b6106265 776 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 777 if (r)
778 goto out;
b6106265 779 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 780 if (r)
781 goto out;
782 }
783 crypto_xor(&buf[0], &buf[12], 4);
784 crypto_xor(&buf[4], &buf[8], 4);
785
786 /* apply whitening (8 bytes) to whole sector */
787 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
788 crypto_xor(data + i * 8, buf, 8);
789out:
1a71d6ff 790 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 791 return r;
792}
793
794static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
795 struct dm_crypt_request *dmreq)
796{
ef43aa38 797 struct scatterlist *sg;
ed04d981 798 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 799 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 800 u8 *src;
801 int r = 0;
802
803 /* Remove whitening from ciphertext */
804 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 805 sg = crypt_get_sg_data(cc, dmreq->sg_in);
806 src = kmap_atomic(sg_page(sg));
807 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 808 kunmap_atomic(src);
809 }
810
811 /* Calculate IV */
45fe93df 812 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 813 if (cc->iv_size > 8)
45fe93df
AB		 814 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
815 cc->iv_size - 8);
ed04d981
MB		 816
817 return r;
818}
819
820static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
821 struct dm_crypt_request *dmreq)
822{
ef43aa38 823 struct scatterlist *sg;
ed04d981
MB		 824 u8 *dst;
825 int r;
826
827 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
828 return 0;
829
830 /* Apply whitening on ciphertext */
ef43aa38
MB		 831 sg = crypt_get_sg_data(cc, dmreq->sg_out);
832 dst = kmap_atomic(sg_page(sg));
833 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 834 kunmap_atomic(dst);
835
836 return r;
837}
838
ef43aa38
MB		 839static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
840 struct dm_crypt_request *dmreq)
841{
842 /* Used only for writes, there must be an additional space to store IV */
843 get_random_bytes(iv, cc->iv_size);
844 return 0;
845}
846
1b1b58f5 847static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 848 .generator = crypt_iv_plain_gen
849};
850
1b1b58f5 851static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 852 .generator = crypt_iv_plain64_gen
853};
854
7e3fd855
MB		 855static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
856 .generator = crypt_iv_plain64be_gen
857};
858
1b1b58f5 859static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 860 .ctr = crypt_iv_essiv_ctr,
861 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 862 .init = crypt_iv_essiv_init,
542da317 863 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 864 .generator = crypt_iv_essiv_gen
865};
866
1b1b58f5 867static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 868 .ctr = crypt_iv_benbi_ctr,
869 .dtr = crypt_iv_benbi_dtr,
870 .generator = crypt_iv_benbi_gen
871};
1da177e4 872
1b1b58f5 873static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 874 .generator = crypt_iv_null_gen
875};
876
1b1b58f5 877static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 878 .ctr = crypt_iv_lmk_ctr,
879 .dtr = crypt_iv_lmk_dtr,
880 .init = crypt_iv_lmk_init,
881 .wipe = crypt_iv_lmk_wipe,
882 .generator = crypt_iv_lmk_gen,
883 .post = crypt_iv_lmk_post
884};
885
1b1b58f5 886static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 887 .ctr = crypt_iv_tcw_ctr,
888 .dtr = crypt_iv_tcw_dtr,
889 .init = crypt_iv_tcw_init,
890 .wipe = crypt_iv_tcw_wipe,
891 .generator = crypt_iv_tcw_gen,
892 .post = crypt_iv_tcw_post
893};
894
ef43aa38
MB		 895static struct crypt_iv_operations crypt_iv_random_ops = {
896 .generator = crypt_iv_random_gen
897};
898
899/*
900 * Integrity extensions
901 */
902static bool crypt_integrity_aead(struct crypt_config *cc)
903{
904 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
905}
906
907static bool crypt_integrity_hmac(struct crypt_config *cc)
908{
33d2f09f 909 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 910}
911
912/* Get sg containing data */
913static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
914 struct scatterlist *sg)
915{
33d2f09f 916 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 917 return &sg[2];
918
919 return sg;
920}
921
922static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
923{
924 struct bio_integrity_payload *bip;
925 unsigned int tag_len;
926 int ret;
927
928 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
929 return 0;
930
931 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
932 if (IS_ERR(bip))
933 return PTR_ERR(bip);
934
935 tag_len = io->cc->on_disk_tag_size * bio_sectors(bio);
936
937 bip->bip_iter.bi_size = tag_len;
938 bip->bip_iter.bi_sector = io->cc->start + io->sector;
939
ef43aa38
MB		 940 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
941 tag_len, offset_in_page(io->integrity_metadata));
942 if (unlikely(ret != tag_len))
943 return -ENOMEM;
944
945 return 0;
946}
947
948static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
949{
950#ifdef CONFIG_BLK_DEV_INTEGRITY
951 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
952
953 /* From now we require underlying device with our integrity profile */
954 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
955 ti->error = "Integrity profile not supported.";
956 return -EINVAL;
957 }
958
583fe747
MP		 959 if (bi->tag_size != cc->on_disk_tag_size ||
960 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 961 ti->error = "Integrity profile tag size mismatch.";
962 return -EINVAL;
963 }
583fe747
MP		 964 if (1 << bi->interval_exp != cc->sector_size) {
965 ti->error = "Integrity profile sector size mismatch.";
966 return -EINVAL;
967 }
ef43aa38 968
33d2f09f 969 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 970 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
971 DMINFO("Integrity AEAD, tag size %u, IV size %u.",
972 cc->integrity_tag_size, cc->integrity_iv_size);
973
974 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
975 ti->error = "Integrity AEAD auth tag size is not supported.";
976 return -EINVAL;
977 }
978 } else if (cc->integrity_iv_size)
979 DMINFO("Additional per-sector space %u bytes for IV.",
980 cc->integrity_iv_size);
981
982 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
983 ti->error = "Not enough space for integrity tag in the profile.";
984 return -EINVAL;
985 }
986
987 return 0;
988#else
989 ti->error = "Integrity profile not supported.";
990 return -EINVAL;
991#endif
992}
993
d469f841
MB		 994static void crypt_convert_init(struct crypt_config *cc,
995 struct convert_context *ctx,
996 struct bio *bio_out, struct bio *bio_in,
fcd369da 997 sector_t sector)
1da177e4
LT		 998{
999 ctx->bio_in = bio_in;
1000 ctx->bio_out = bio_out;
003b5c57
KO		 1001 if (bio_in)
1002 ctx->iter_in = bio_in->bi_iter;
1003 if (bio_out)
1004 ctx->iter_out = bio_out->bi_iter;
c66029f4 1005 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1006 init_completion(&ctx->restart);
1da177e4
LT		 1007}
1008
b2174eeb 1009static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1010 void *req)
b2174eeb
HY		 1011{
1012 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1013}
1014
ef43aa38 1015static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1016{
ef43aa38 1017 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1018}
1019
2dc5327d
MB		 1020static u8 *iv_of_dmreq(struct crypt_config *cc,
1021 struct dm_crypt_request *dmreq)
1022{
33d2f09f 1023 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1024 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1025 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1026 else
1027 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1028 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1029}
1030
ef43aa38
MB		 1031static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1032 struct dm_crypt_request *dmreq)
1033{
1034 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1035}
1036
1037static uint64_t *org_sector_of_dmreq(struct crypt_config *cc,
1038 struct dm_crypt_request *dmreq)
1039{
1040 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
1041 return (uint64_t*) ptr;
1042}
1043
1044static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1045 struct dm_crypt_request *dmreq)
1046{
1047 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1048 cc->iv_size + sizeof(uint64_t);
1049 return (unsigned int*)ptr;
1050}
1051
1052static void *tag_from_dmreq(struct crypt_config *cc,
1053 struct dm_crypt_request *dmreq)
1054{
1055 struct convert_context *ctx = dmreq->ctx;
1056 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1057
1058 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1059 cc->on_disk_tag_size];
1060}
1061
1062static void *iv_tag_from_dmreq(struct crypt_config *cc,
1063 struct dm_crypt_request *dmreq)
1064{
1065 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1066}
1067
1068static int crypt_convert_block_aead(struct crypt_config *cc,
1069 struct convert_context *ctx,
1070 struct aead_request *req,
1071 unsigned int tag_offset)
01482b76 1072{
003b5c57
KO		 1073 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1074 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1075 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1076 u8 *iv, *org_iv, *tag_iv, *tag;
1077 uint64_t *sector;
1078 int r = 0;
1079
1080 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1081
8f0009a2 1082 /* Reject unexpected unaligned bio. */
0440d5c0 1083 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1084 return -EIO;
3a7f6c99 1085
b2174eeb 1086 dmreq = dmreq_of_req(cc, req);
ef43aa38 1087 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1088 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1089 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1090 dmreq->ctx = ctx;
1091
1092 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1093
1094 sector = org_sector_of_dmreq(cc, dmreq);
1095 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1096
2dc5327d 1097 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1098 org_iv = org_iv_of_dmreq(cc, dmreq);
1099 tag = tag_from_dmreq(cc, dmreq);
1100 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1101
1102 /* AEAD request:
1103 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1104 * | (authenticated) | (auth+encryption) | |
1105 * | sector_LE | IV | sector in/out | tag in/out |
1106 */
1107 sg_init_table(dmreq->sg_in, 4);
1108 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1109 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1110 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1111 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1112
1113 sg_init_table(dmreq->sg_out, 4);
1114 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1115 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1116 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1117 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1118
1119 if (cc->iv_gen_ops) {
1120 /* For READs use IV stored in integrity metadata */
1121 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1122 memcpy(org_iv, tag_iv, cc->iv_size);
1123 } else {
1124 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1125 if (r < 0)
1126 return r;
1127 /* Store generated IV in integrity metadata */
1128 if (cc->integrity_iv_size)
1129 memcpy(tag_iv, org_iv, cc->iv_size);
1130 }
1131 /* Working copy of IV, to be modified in crypto API */
1132 memcpy(iv, org_iv, cc->iv_size);
1133 }
1134
1135 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1136 if (bio_data_dir(ctx->bio_in) == WRITE) {
1137 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1138 cc->sector_size, iv);
ef43aa38
MB		 1139 r = crypto_aead_encrypt(req);
1140 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1141 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1142 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1143 } else {
1144 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1145 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1146 r = crypto_aead_decrypt(req);
1147 }
1148
1149 if (r == -EBADMSG)
1150 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1151 (unsigned long long)le64_to_cpu(*sector));
1152
1153 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1154 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1155
8f0009a2
MB		 1156 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1157 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1158
ef43aa38
MB		 1159 return r;
1160}
1161
1162static int crypt_convert_block_skcipher(struct crypt_config *cc,
1163 struct convert_context *ctx,
1164 struct skcipher_request *req,
1165 unsigned int tag_offset)
1166{
1167 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1168 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1169 struct scatterlist *sg_in, *sg_out;
1170 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1171 u8 *iv, *org_iv, *tag_iv;
1172 uint64_t *sector;
1173 int r = 0;
01482b76 1174
8f0009a2 1175 /* Reject unexpected unaligned bio. */
0440d5c0 1176 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1177 return -EIO;
1178
ef43aa38 1179 dmreq = dmreq_of_req(cc, req);
c66029f4 1180 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1181 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1182 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1183 dmreq->ctx = ctx;
01482b76 1184
ef43aa38
MB		 1185 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1186
1187 iv = iv_of_dmreq(cc, dmreq);
1188 org_iv = org_iv_of_dmreq(cc, dmreq);
1189 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1190
1191 sector = org_sector_of_dmreq(cc, dmreq);
1192 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1193
1194 /* For skcipher we use only the first sg item */
1195 sg_in = &dmreq->sg_in[0];
1196 sg_out = &dmreq->sg_out[0];
01482b76 1197
ef43aa38 1198 sg_init_table(sg_in, 1);
8f0009a2 1199 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1200
1201 sg_init_table(sg_out, 1);
8f0009a2 1202 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1203
3a7f6c99 1204 if (cc->iv_gen_ops) {
ef43aa38
MB		 1205 /* For READs use IV stored in integrity metadata */
1206 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1207 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1208 } else {
1209 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1210 if (r < 0)
1211 return r;
1212 /* Store generated IV in integrity metadata */
1213 if (cc->integrity_iv_size)
1214 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1215 }
1216 /* Working copy of IV, to be modified in crypto API */
1217 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1218 }
1219
8f0009a2 1220 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1221
1222 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1223 r = crypto_skcipher_encrypt(req);
3a7f6c99 1224 else
bbdb23b5 1225 r = crypto_skcipher_decrypt(req);
3a7f6c99 1226
2dc5327d 1227 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1228 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1229
8f0009a2
MB		 1230 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1231 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1232
3a7f6c99 1233 return r;
01482b76
MB		 1234}
1235
95497a96
MB		 1236static void kcryptd_async_done(struct crypto_async_request *async_req,
1237 int error);
c0297721 1238
ef43aa38
MB		 1239static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1240 struct convert_context *ctx)
ddd42edf 1241{
c66029f4 1242 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1243
ef43aa38 1244 if (!ctx->r.req)
6f1c819c 1245 ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1246
ef43aa38 1247 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1248
1249 /*
1250 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1251 * requests if driver request queue is full.
1252 */
ef43aa38 1253 skcipher_request_set_callback(ctx->r.req,
432061b3 1254 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1255 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
ddd42edf
MB		 1256}
1257
ef43aa38
MB		 1258static void crypt_alloc_req_aead(struct crypt_config *cc,
1259 struct convert_context *ctx)
1260{
1261 if (!ctx->r.req_aead)
6f1c819c 1262 ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1263
ef43aa38 1264 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1265
1266 /*
1267 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1268 * requests if driver request queue is full.
1269 */
ef43aa38 1270 aead_request_set_callback(ctx->r.req_aead,
432061b3 1271 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38
MB		 1272 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1273}
1274
1275static void crypt_alloc_req(struct crypt_config *cc,
1276 struct convert_context *ctx)
1277{
33d2f09f 1278 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1279 crypt_alloc_req_aead(cc, ctx);
1280 else
1281 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1282}
1283
ef43aa38
MB		 1284static void crypt_free_req_skcipher(struct crypt_config *cc,
1285 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1286{
1287 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1288
bbdb23b5 1289 if ((struct skcipher_request *)(io + 1) != req)
6f1c819c 1290 mempool_free(req, &cc->req_pool);
298a9fa0
MP		 1291}
1292
ef43aa38
MB		 1293static void crypt_free_req_aead(struct crypt_config *cc,
1294 struct aead_request *req, struct bio *base_bio)
1295{
1296 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1297
1298 if ((struct aead_request *)(io + 1) != req)
6f1c819c 1299 mempool_free(req, &cc->req_pool);
ef43aa38
MB		 1300}
1301
1302static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1303{
33d2f09f 1304 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1305 crypt_free_req_aead(cc, req, base_bio);
1306 else
1307 crypt_free_req_skcipher(cc, req, base_bio);
1308}
1309
1da177e4
LT		 1310/*
1311 * Encrypt / decrypt data from one bio to another one (can be the same one)
1312 */
4e4cbee9 1313static blk_status_t crypt_convert(struct crypt_config *cc,
d469f841 1314 struct convert_context *ctx)
1da177e4 1315{
ef43aa38 1316 unsigned int tag_offset = 0;
ff3af92b 1317 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1318 int r;
1da177e4 1319
40b6229b 1320 atomic_set(&ctx->cc_pending, 1);
c8081618 1321
003b5c57 1322 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1323
3a7f6c99 1324 crypt_alloc_req(cc, ctx);
40b6229b 1325 atomic_inc(&ctx->cc_pending);
3f1e9070 1326
33d2f09f 1327 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1328 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1329 else
1330 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1331
1332 switch (r) {
54cea3f6
MB		 1333 /*
1334 * The request was queued by a crypto driver
1335 * but the driver request queue is full, let's wait.
1336 */
3a7f6c99
MB		 1337 case -EBUSY:
1338 wait_for_completion(&ctx->restart);
16735d02 1339 reinit_completion(&ctx->restart);
54cea3f6
MB		 1340 /* fall through */
1341 /*
1342 * The request is queued and processed asynchronously,
1343 * completion function kcryptd_async_done() will be called.
1344 */
c0403ec0 1345 case -EINPROGRESS:
ef43aa38 1346 ctx->r.req = NULL;
8f0009a2 1347 ctx->cc_sector += sector_step;
583fe747 1348 tag_offset++;
3f1e9070 1349 continue;
54cea3f6
MB		 1350 /*
1351 * The request was already processed (synchronously).
1352 */
3a7f6c99 1353 case 0:
40b6229b 1354 atomic_dec(&ctx->cc_pending);
8f0009a2 1355 ctx->cc_sector += sector_step;
583fe747 1356 tag_offset++;
c7f1b204 1357 cond_resched();
3a7f6c99 1358 continue;
ef43aa38
MB		 1359 /*
1360 * There was a data integrity error.
1361 */
1362 case -EBADMSG:
1363 atomic_dec(&ctx->cc_pending);
4e4cbee9 1364 return BLK_STS_PROTECTION;
ef43aa38
MB		 1365 /*
1366 * There was an error while processing the request.
1367 */
3f1e9070 1368 default:
40b6229b 1369 atomic_dec(&ctx->cc_pending);
4e4cbee9 1370 return BLK_STS_IOERR;
3f1e9070 1371 }
1da177e4
LT		 1372 }
1373
3f1e9070 1374 return 0;
1da177e4
LT		 1375}
1376
cf2f1abf
MP		 1377static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1378
1da177e4
LT		 1379/*
1380 * Generate a new unfragmented bio with the given size
586b286b
MS		 1381 * This should never violate the device limitations (but only because
1382 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1383 *
1384 * This function may be called concurrently. If we allocate from the mempool
1385 * concurrently, there is a possibility of deadlock. For example, if we have
1386 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1387 * the mempool concurrently, it may deadlock in a situation where both processes
1388 * have allocated 128 pages and the mempool is exhausted.
1389 *
1390 * In order to avoid this scenario we allocate the pages under a mutex.
1391 *
1392 * In order to not degrade performance with excessive locking, we try
1393 * non-blocking allocations without a mutex first but on failure we fallback
1394 * to blocking allocations with a mutex.
1da177e4 1395 */
cf2f1abf 1396static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1397{
49a8a920 1398 struct crypt_config *cc = io->cc;
8b004457 1399 struct bio *clone;
1da177e4 1400 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1401 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1402 unsigned i, len, remaining_size;
91e10625 1403 struct page *page;
1da177e4 1404
7145c241 1405retry:
d0164adc 1406 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1407 mutex_lock(&cc->bio_alloc_lock);
1408
6f1c819c 1409 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs);
8b004457 1410 if (!clone)
ef43aa38 1411 goto out;
1da177e4 1412
027581f3 1413 clone_init(io, clone);
6a24c718 1414
7145c241
MP		 1415 remaining_size = size;
1416
f97380bc 1417 for (i = 0; i < nr_iovecs; i++) {
6f1c819c 1418 page = mempool_alloc(&cc->page_pool, gfp_mask);
7145c241
MP		 1419 if (!page) {
1420 crypt_free_buffer_pages(cc, clone);
1421 bio_put(clone);
d0164adc 1422 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1423 goto retry;
1424 }
1da177e4 1425
7145c241 1426 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1427
0dae7fe5 1428 bio_add_page(clone, page, len, 0);
1da177e4 1429
7145c241 1430 remaining_size -= len;
1da177e4
LT		 1431 }
1432
ef43aa38
MB		 1433 /* Allocate space for integrity tags */
1434 if (dm_crypt_integrity_io_alloc(io, clone)) {
1435 crypt_free_buffer_pages(cc, clone);
1436 bio_put(clone);
1437 clone = NULL;
1438 }
1439out:
d0164adc 1440 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1441 mutex_unlock(&cc->bio_alloc_lock);
1442
8b004457 1443 return clone;
1da177e4
LT		 1444}
1445
644bd2f0 1446static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1447{
644bd2f0 1448 unsigned int i;
1da177e4
LT		 1449 struct bio_vec *bv;
1450
cb34e057 1451 bio_for_each_segment_all(bv, clone, i) {
1da177e4 1452 BUG_ON(!bv->bv_page);
6f1c819c 1453 mempool_free(bv->bv_page, &cc->page_pool);
1da177e4
LT		 1454 }
1455}
1456
298a9fa0
MP		 1457static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1458 struct bio *bio, sector_t sector)
dc440d1e 1459{
49a8a920 1460 io->cc = cc;
dc440d1e
MB		 1461 io->base_bio = bio;
1462 io->sector = sector;
1463 io->error = 0;
ef43aa38
MB		 1464 io->ctx.r.req = NULL;
1465 io->integrity_metadata = NULL;
1466 io->integrity_metadata_from_pool = false;
40b6229b 1467 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1468}
1469
3e1a8bdd
MB		 1470static void crypt_inc_pending(struct dm_crypt_io *io)
1471{
40b6229b 1472 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1473}
1474
1da177e4
LT		 1475/*
1476 * One of the bios was finished. Check for completion of
1477 * the whole request and correctly clean up the buffer.
1478 */
5742fd77 1479static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1480{
49a8a920 1481 struct crypt_config *cc = io->cc;
b35f8caa 1482 struct bio *base_bio = io->base_bio;
4e4cbee9 1483 blk_status_t error = io->error;
1da177e4 1484
40b6229b 1485 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1486 return;
1487
ef43aa38
MB		 1488 if (io->ctx.r.req)
1489 crypt_free_req(cc, io->ctx.r.req, base_bio);
1490
1491 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1492 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1493 else
1494 kfree(io->integrity_metadata);
b35f8caa 1495
4e4cbee9 1496 base_bio->bi_status = error;
4246a0b6 1497 bio_endio(base_bio);
1da177e4
LT		 1498}
1499
1500/*
cabf08e4 1501 * kcryptd/kcryptd_io:
1da177e4
LT		 1502 *
1503 * Needed because it would be very unwise to do decryption in an
23541d2d 1504 * interrupt context.
cabf08e4
MB		 1505 *
1506 * kcryptd performs the actual encryption or decryption.
1507 *
1508 * kcryptd_io performs the IO submission.
1509 *
1510 * They must be separated as otherwise the final stages could be
1511 * starved by new requests which can block in the first stages due
1512 * to memory allocation.
c0297721
AK		 1513 *
1514 * The work is done per CPU global for all dm-crypt instances.
1515 * They should not depend on each other and do not block.
1da177e4 1516 */
4246a0b6 1517static void crypt_endio(struct bio *clone)
8b004457 1518{
028867ac 1519 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1520 struct crypt_config *cc = io->cc;
ee7a491e 1521 unsigned rw = bio_data_dir(clone);
4e4cbee9 1522 blk_status_t error;
8b004457
MB		 1523
1524 /*
6712ecf8 1525 * free the processed pages
8b004457 1526 */
ee7a491e 1527 if (rw == WRITE)
644bd2f0 1528 crypt_free_buffer_pages(cc, clone);
8b004457 1529
4e4cbee9 1530 error = clone->bi_status;
8b004457 1531 bio_put(clone);
8b004457 1532
9b81c842 1533 if (rw == READ && !error) {
ee7a491e
MB		 1534 kcryptd_queue_crypt(io);
1535 return;
1536 }
5742fd77 1537
9b81c842
SL		 1538 if (unlikely(error))
1539 io->error = error;
5742fd77
MB		 1540
1541 crypt_dec_pending(io);
8b004457
MB		 1542}
1543
028867ac 1544static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1545{
49a8a920 1546 struct crypt_config *cc = io->cc;
8b004457
MB		 1547
1548 clone->bi_private = io;
1549 clone->bi_end_io = crypt_endio;
74d46992 1550 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1551 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1552}
1553
20c82538 1554static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1555{
49a8a920 1556 struct crypt_config *cc = io->cc;
8b004457 1557 struct bio *clone;
93e605c2 1558
8b004457 1559 /*
59779079
MS		 1560 * We need the original biovec array in order to decrypt
1561 * the whole bio data *afterwards* -- thanks to immutable
1562 * biovecs we don't need to worry about the block layer
1563 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1564 */
6f1c819c 1565 clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
7eaceacc 1566 if (!clone)
20c82538 1567 return 1;
8b004457 1568
20c82538
MB		 1569 crypt_inc_pending(io);
1570
8b004457 1571 clone_init(io, clone);
4f024f37 1572 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1573
ef43aa38
MB		 1574 if (dm_crypt_integrity_io_alloc(io, clone)) {
1575 crypt_dec_pending(io);
1576 bio_put(clone);
1577 return 1;
1578 }
1579
93e605c2 1580 generic_make_request(clone);
20c82538 1581 return 0;
8b004457
MB		 1582}
1583
dc267621
MP		 1584static void kcryptd_io_read_work(struct work_struct *work)
1585{
1586 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1587
1588 crypt_inc_pending(io);
1589 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1590 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1591 crypt_dec_pending(io);
1592}
1593
1594static void kcryptd_queue_read(struct dm_crypt_io *io)
1595{
1596 struct crypt_config *cc = io->cc;
1597
1598 INIT_WORK(&io->work, kcryptd_io_read_work);
1599 queue_work(cc->io_queue, &io->work);
1600}
1601
4e4eef64
MB		 1602static void kcryptd_io_write(struct dm_crypt_io *io)
1603{
95497a96 1604 struct bio *clone = io->ctx.bio_out;
dc267621 1605
95497a96 1606 generic_make_request(clone);
4e4eef64
MB		 1607}
1608
b3c5fd30
MP		 1609#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1610
dc267621 1611static int dmcrypt_write(void *data)
395b167c 1612{
dc267621 1613 struct crypt_config *cc = data;
b3c5fd30
MP		 1614 struct dm_crypt_io *io;
1615
dc267621 1616 while (1) {
b3c5fd30 1617 struct rb_root write_tree;
dc267621 1618 struct blk_plug plug;
395b167c 1619
c7329eff 1620 spin_lock_irq(&cc->write_thread_lock);
dc267621 1621continue_locked:
395b167c 1622
b3c5fd30 1623 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1624 goto pop_from_list;
1625
f659b100 1626 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1627
c7329eff 1628 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1629
f659b100 1630 if (unlikely(kthread_should_stop())) {
642fa448 1631 set_current_state(TASK_RUNNING);
f659b100
RV		 1632 break;
1633 }
1634
dc267621
MP		 1635 schedule();
1636
642fa448 1637 set_current_state(TASK_RUNNING);
c7329eff 1638 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1639 goto continue_locked;
1640
1641pop_from_list:
b3c5fd30
MP		 1642 write_tree = cc->write_tree;
1643 cc->write_tree = RB_ROOT;
c7329eff 1644 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1645
b3c5fd30
MP		 1646 BUG_ON(rb_parent(write_tree.rb_node));
1647
1648 /*
1649 * Note: we cannot walk the tree here with rb_next because
1650 * the structures may be freed when kcryptd_io_write is called.
1651 */
dc267621
MP		 1652 blk_start_plug(&plug);
1653 do {
b3c5fd30
MP		 1654 io = crypt_io_from_node(rb_first(&write_tree));
1655 rb_erase(&io->rb_node, &write_tree);
dc267621 1656 kcryptd_io_write(io);
b3c5fd30 1657 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1658 blk_finish_plug(&plug);
1659 }
1660 return 0;
395b167c
AK		 1661}
1662
72c6e7af 1663static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1664{
dec1cedf 1665 struct bio *clone = io->ctx.bio_out;
49a8a920 1666 struct crypt_config *cc = io->cc;
dc267621 1667 unsigned long flags;
b3c5fd30
MP		 1668 sector_t sector;
1669 struct rb_node **rbp, *parent;
dec1cedf 1670
4e4cbee9 1671 if (unlikely(io->error)) {
dec1cedf
MB		 1672 crypt_free_buffer_pages(cc, clone);
1673 bio_put(clone);
6c031f41 1674 crypt_dec_pending(io);
dec1cedf
MB		 1675 return;
1676 }
1677
1678 /* crypt_convert should have filled the clone bio */
003b5c57 1679 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1680
4f024f37 1681 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1682
0f5d8e6e
MP		 1683 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1684 generic_make_request(clone);
1685 return;
1686 }
1687
c7329eff
MP		 1688 spin_lock_irqsave(&cc->write_thread_lock, flags);
1689 if (RB_EMPTY_ROOT(&cc->write_tree))
1690 wake_up_process(cc->write_thread);
b3c5fd30
MP		 1691 rbp = &cc->write_tree.rb_node;
1692 parent = NULL;
1693 sector = io->sector;
1694 while (*rbp) {
1695 parent = *rbp;
1696 if (sector < crypt_io_from_node(parent)->sector)
1697 rbp = &(*rbp)->rb_left;
1698 else
1699 rbp = &(*rbp)->rb_right;
1700 }
1701 rb_link_node(&io->rb_node, parent, rbp);
1702 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 1703 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 1704}
1705
fc5a5e9a 1706static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1707{
49a8a920 1708 struct crypt_config *cc = io->cc;
8b004457 1709 struct bio *clone;
c8081618 1710 int crypt_finished;
b635b00e 1711 sector_t sector = io->sector;
4e4cbee9 1712 blk_status_t r;
8b004457 1713
fc5a5e9a
MB		 1714 /*
1715 * Prevent io from disappearing until this function completes.
1716 */
1717 crypt_inc_pending(io);
b635b00e 1718 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1719
cf2f1abf
MP		 1720 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1721 if (unlikely(!clone)) {
4e4cbee9 1722 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 1723 goto dec;
1724 }
c8081618 1725
cf2f1abf
MP		 1726 io->ctx.bio_out = clone;
1727 io->ctx.iter_out = clone->bi_iter;
b635b00e 1728
cf2f1abf 1729 sector += bio_sectors(clone);
93e605c2 1730
cf2f1abf
MP		 1731 crypt_inc_pending(io);
1732 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1733 if (r)
ef43aa38 1734 io->error = r;
cf2f1abf 1735 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1736
cf2f1abf
MP		 1737 /* Encryption was already finished, submit io now */
1738 if (crypt_finished) {
1739 kcryptd_crypt_write_io_submit(io, 0);
1740 io->sector = sector;
93e605c2 1741 }
899c95d3 1742
cf2f1abf 1743dec:
899c95d3 1744 crypt_dec_pending(io);
84131db6
MB		 1745}
1746
72c6e7af 1747static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1748{
5742fd77
MB		 1749 crypt_dec_pending(io);
1750}
1751
4e4eef64 1752static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1753{
49a8a920 1754 struct crypt_config *cc = io->cc;
4e4cbee9 1755 blk_status_t r;
1da177e4 1756
3e1a8bdd 1757 crypt_inc_pending(io);
3a7f6c99 1758
53017030 1759 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1760 io->sector);
1da177e4 1761
5742fd77 1762 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1763 if (r)
ef43aa38 1764 io->error = r;
5742fd77 1765
40b6229b 1766 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1767 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1768
1769 crypt_dec_pending(io);
1da177e4
LT		 1770}
1771
95497a96
MB		 1772static void kcryptd_async_done(struct crypto_async_request *async_req,
1773 int error)
1774{
b2174eeb
HY		 1775 struct dm_crypt_request *dmreq = async_req->data;
1776 struct convert_context *ctx = dmreq->ctx;
95497a96 1777 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1778 struct crypt_config *cc = io->cc;
95497a96 1779
54cea3f6
MB		 1780 /*
1781 * A request from crypto driver backlog is going to be processed now,
1782 * finish the completion and continue in crypt_convert().
1783 * (Callback will be called for the second time for this request.)
1784 */
c0403ec0
RV		 1785 if (error == -EINPROGRESS) {
1786 complete(&ctx->restart);
95497a96 1787 return;
c0403ec0 1788 }
95497a96 1789
2dc5327d 1790 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 1791 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 1792
ef43aa38
MB		 1793 if (error == -EBADMSG) {
1794 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1795 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 1796 io->error = BLK_STS_PROTECTION;
ef43aa38 1797 } else if (error < 0)
4e4cbee9 1798 io->error = BLK_STS_IOERR;
72c6e7af 1799
298a9fa0 1800 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1801
40b6229b 1802 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1803 return;
95497a96
MB		 1804
1805 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1806 kcryptd_crypt_read_done(io);
95497a96 1807 else
72c6e7af 1808 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1809}
1810
395b167c 1811static void kcryptd_crypt(struct work_struct *work)
1da177e4 1812{
028867ac 1813 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1814
cabf08e4 1815 if (bio_data_dir(io->base_bio) == READ)
395b167c 1816 kcryptd_crypt_read_convert(io);
4e4eef64 1817 else
395b167c 1818 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1819}
1820
395b167c 1821static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1822{
49a8a920 1823 struct crypt_config *cc = io->cc;
cabf08e4 1824
395b167c
AK		 1825 INIT_WORK(&io->work, kcryptd_crypt);
1826 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1827}
1828
ef43aa38 1829static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 1830{
ef43aa38
MB		 1831 if (!cc->cipher_tfm.tfms_aead)
1832 return;
1da177e4 1833
ef43aa38
MB		 1834 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1835 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1836 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 1837 }
1838
ef43aa38
MB		 1839 kfree(cc->cipher_tfm.tfms_aead);
1840 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 1841}
1842
ef43aa38 1843static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1844{
d1f96423
MB		 1845 unsigned i;
1846
ef43aa38 1847 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1848 return;
1849
d1f96423 1850 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1851 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1852 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1853 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1854 }
fd2d231f 1855
ef43aa38
MB		 1856 kfree(cc->cipher_tfm.tfms);
1857 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1858}
1859
ef43aa38
MB		 1860static void crypt_free_tfms(struct crypt_config *cc)
1861{
33d2f09f 1862 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1863 crypt_free_tfms_aead(cc);
1864 else
1865 crypt_free_tfms_skcipher(cc);
1866}
1867
1868static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1869{
d1f96423
MB		 1870 unsigned i;
1871 int err;
1872
6396bb22
KC		 1873 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
1874 sizeof(struct crypto_skcipher *),
1875 GFP_KERNEL);
ef43aa38 1876 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1877 return -ENOMEM;
1878
d1f96423 1879 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1880 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1881 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1882 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1883 crypt_free_tfms(cc);
d1f96423
MB		 1884 return err;
1885 }
1886 }
1887
1888 return 0;
1889}
1890
ef43aa38
MB		 1891static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1892{
ef43aa38
MB		 1893 int err;
1894
1895 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1896 if (!cc->cipher_tfm.tfms)
1897 return -ENOMEM;
1898
ef43aa38
MB		 1899 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1900 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1901 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1902 crypt_free_tfms(cc);
1903 return err;
1904 }
1905
ef43aa38
MB		 1906 return 0;
1907}
1908
1909static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1910{
33d2f09f 1911 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1912 return crypt_alloc_tfms_aead(cc, ciphermode);
1913 else
1914 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1915}
1916
1917static unsigned crypt_subkey_size(struct crypt_config *cc)
1918{
1919 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1920}
1921
1922static unsigned crypt_authenckey_size(struct crypt_config *cc)
1923{
1924 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1925}
1926
1927/*
1928 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1929 * the key must be for some reason in special format.
1930 * This funcion converts cc->key to this special format.
1931 */
1932static void crypt_copy_authenckey(char *p, const void *key,
1933 unsigned enckeylen, unsigned authkeylen)
1934{
1935 struct crypto_authenc_key_param *param;
1936 struct rtattr *rta;
1937
1938 rta = (struct rtattr *)p;
1939 param = RTA_DATA(rta);
1940 param->enckeylen = cpu_to_be32(enckeylen);
1941 rta->rta_len = RTA_LENGTH(sizeof(*param));
1942 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1943 p += RTA_SPACE(sizeof(*param));
1944 memcpy(p, key + enckeylen, authkeylen);
1945 p += authkeylen;
1946 memcpy(p, key, enckeylen);
1947}
1948
671ea6b4 1949static int crypt_setkey(struct crypt_config *cc)
c0297721 1950{
da31a078 1951 unsigned subkey_size;
fd2d231f
MP		 1952 int err = 0, i, r;
1953
da31a078 1954 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1955 subkey_size = crypt_subkey_size(cc);
da31a078 1956
27c70036
MB		 1957 if (crypt_integrity_hmac(cc)) {
1958 if (subkey_size < cc->key_mac_size)
1959 return -EINVAL;
1960
ef43aa38
MB		 1961 crypt_copy_authenckey(cc->authenc_key, cc->key,
1962 subkey_size - cc->key_mac_size,
1963 cc->key_mac_size);
27c70036
MB		 1964 }
1965
fd2d231f 1966 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 1967 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 1968 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1969 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 1970 else if (crypt_integrity_aead(cc))
1971 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1972 cc->key + (i * subkey_size),
1973 subkey_size);
ef43aa38
MB		 1974 else
1975 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
1976 cc->key + (i * subkey_size),
1977 subkey_size);
fd2d231f
MP		 1978 if (r)
1979 err = r;
c0297721
AK		 1980 }
1981
ef43aa38
MB		 1982 if (crypt_integrity_hmac(cc))
1983 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
1984
c0297721
AK		 1985 return err;
1986}
1987
c538f6ec
OK		 1988#ifdef CONFIG_KEYS
1989
027c431c
OK		 1990static bool contains_whitespace(const char *str)
1991{
1992 while (*str)
1993 if (isspace(*str++))
1994 return true;
1995 return false;
1996}
1997
c538f6ec
OK		 1998static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
1999{
2000 char *new_key_string, *key_desc;
2001 int ret;
2002 struct key *key;
2003 const struct user_key_payload *ukp;
2004
027c431c
OK		 2005 /*
2006 * Reject key_string with whitespace. dm core currently lacks code for
2007 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2008 */
2009 if (contains_whitespace(key_string)) {
2010 DMERR("whitespace chars not allowed in key string");
2011 return -EINVAL;
2012 }
2013
c538f6ec
OK		 2014 /* look for next ':' separating key_type from key_description */
2015 key_desc = strpbrk(key_string, ":");
2016 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2017 return -EINVAL;
2018
2019 if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
2020 strncmp(key_string, "user:", key_desc - key_string + 1))
2021 return -EINVAL;
2022
2023 new_key_string = kstrdup(key_string, GFP_KERNEL);
2024 if (!new_key_string)
2025 return -ENOMEM;
2026
2027 key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
2028 key_desc + 1, NULL);
2029 if (IS_ERR(key)) {
2030 kzfree(new_key_string);
2031 return PTR_ERR(key);
2032 }
2033
f5b0cba8 2034 down_read(&key->sem);
c538f6ec 2035
0837e49a 2036 ukp = user_key_payload_locked(key);
c538f6ec 2037 if (!ukp) {
f5b0cba8 2038 up_read(&key->sem);
c538f6ec
OK		 2039 key_put(key);
2040 kzfree(new_key_string);
2041 return -EKEYREVOKED;
2042 }
2043
2044 if (cc->key_size != ukp->datalen) {
f5b0cba8 2045 up_read(&key->sem);
c538f6ec
OK		 2046 key_put(key);
2047 kzfree(new_key_string);
2048 return -EINVAL;
2049 }
2050
2051 memcpy(cc->key, ukp->data, cc->key_size);
2052
f5b0cba8 2053 up_read(&key->sem);
c538f6ec
OK		 2054 key_put(key);
2055
2056 /* clear the flag since following operations may invalidate previously valid key */
2057 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2058
2059 ret = crypt_setkey(cc);
2060
c538f6ec
OK		 2061 if (!ret) {
2062 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2063 kzfree(cc->key_string);
2064 cc->key_string = new_key_string;
2065 } else
2066 kzfree(new_key_string);
2067
2068 return ret;
2069}
2070
2071static int get_key_size(char **key_string)
2072{
2073 char *colon, dummy;
2074 int ret;
2075
2076 if (*key_string[0] != ':')
2077 return strlen(*key_string) >> 1;
2078
2079 /* look for next ':' in key string */
2080 colon = strpbrk(*key_string + 1, ":");
2081 if (!colon)
2082 return -EINVAL;
2083
2084 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2085 return -EINVAL;
2086
2087 *key_string = colon;
2088
2089 /* remaining key string should be :<logon|user>:<key_desc> */
2090
2091 return ret;
2092}
2093
2094#else
2095
2096static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2097{
2098 return -EINVAL;
2099}
2100
2101static int get_key_size(char **key_string)
2102{
2103 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2104}
2105
2106#endif
2107
e48d4bbf
MB		 2108static int crypt_set_key(struct crypt_config *cc, char *key)
2109{
de8be5ac
MB		 2110 int r = -EINVAL;
2111 int key_string_len = strlen(key);
2112
69a8cfcd
MB		 2113 /* Hyphen (which gives a key_size of zero) means there is no key. */
2114 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2115 goto out;
e48d4bbf 2116
c538f6ec
OK		 2117 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2118 if (key[0] == ':') {
2119 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2120 goto out;
c538f6ec 2121 }
e48d4bbf 2122
265e9098
OK		 2123 /* clear the flag since following operations may invalidate previously valid key */
2124 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2125
c538f6ec
OK		 2126 /* wipe references to any kernel keyring key */
2127 kzfree(cc->key_string);
2128 cc->key_string = NULL;
2129
e944e03e
AS		 2130 /* Decode key from its hex representation. */
2131 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2132 goto out;
e48d4bbf 2133
671ea6b4 2134 r = crypt_setkey(cc);
265e9098
OK		 2135 if (!r)
2136 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2137
2138out:
2139 /* Hex key string not needed after here, so wipe it. */
2140 memset(key, '0', key_string_len);
2141
2142 return r;
e48d4bbf
MB		 2143}
2144
2145static int crypt_wipe_key(struct crypt_config *cc)
2146{
c82feeec
OK		 2147 int r;
2148
e48d4bbf 2149 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2150 get_random_bytes(&cc->key, cc->key_size);
c538f6ec
OK		 2151 kzfree(cc->key_string);
2152 cc->key_string = NULL;
c82feeec
OK		 2153 r = crypt_setkey(cc);
2154 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2155
c82feeec 2156 return r;
e48d4bbf
MB		 2157}
2158
5059353d
MP		 2159static void crypt_calculate_pages_per_client(void)
2160{
2161 unsigned long pages = (totalram_pages - totalhigh_pages) * DM_CRYPT_MEMORY_PERCENT / 100;
2162
2163 if (!dm_crypt_clients_n)
2164 return;
2165
2166 pages /= dm_crypt_clients_n;
2167 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2168 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2169 dm_crypt_pages_per_client = pages;
2170}
2171
2172static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2173{
2174 struct crypt_config *cc = pool_data;
2175 struct page *page;
2176
2177 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2178 likely(gfp_mask & __GFP_NORETRY))
2179 return NULL;
2180
2181 page = alloc_page(gfp_mask);
2182 if (likely(page != NULL))
2183 percpu_counter_add(&cc->n_allocated_pages, 1);
2184
2185 return page;
2186}
2187
2188static void crypt_page_free(void *page, void *pool_data)
2189{
2190 struct crypt_config *cc = pool_data;
2191
2192 __free_page(page);
2193 percpu_counter_sub(&cc->n_allocated_pages, 1);
2194}
2195
28513fcc
MB		 2196static void crypt_dtr(struct dm_target *ti)
2197{
2198 struct crypt_config *cc = ti->private;
2199
2200 ti->private = NULL;
2201
2202 if (!cc)
2203 return;
2204
f659b100 2205 if (cc->write_thread)
dc267621
MP		 2206 kthread_stop(cc->write_thread);
2207
28513fcc
MB		 2208 if (cc->io_queue)
2209 destroy_workqueue(cc->io_queue);
2210 if (cc->crypt_queue)
2211 destroy_workqueue(cc->crypt_queue);
2212
fd2d231f
MP		 2213 crypt_free_tfms(cc);
2214
6f1c819c 2215 bioset_exit(&cc->bs);
28513fcc 2216
6f1c819c
KO		 2217 mempool_exit(&cc->page_pool);
2218 mempool_exit(&cc->req_pool);
2219 mempool_exit(&cc->tag_pool);
2220
d00a11df
KO		 2221 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2222 percpu_counter_destroy(&cc->n_allocated_pages);
2223
28513fcc
MB		 2224 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2225 cc->iv_gen_ops->dtr(cc);
2226
28513fcc
MB		 2227 if (cc->dev)
2228 dm_put_device(ti, cc->dev);
2229
5ebaee6d 2230 kzfree(cc->cipher);
7dbcd137 2231 kzfree(cc->cipher_string);
c538f6ec 2232 kzfree(cc->key_string);
ef43aa38
MB		 2233 kzfree(cc->cipher_auth);
2234 kzfree(cc->authenc_key);
28513fcc 2235
d5ffebdd
MS		 2236 mutex_destroy(&cc->bio_alloc_lock);
2237
28513fcc
MB		 2238 /* Must zero key material before freeing */
2239 kzfree(cc);
5059353d
MP		 2240
2241 spin_lock(&dm_crypt_clients_lock);
2242 WARN_ON(!dm_crypt_clients_n);
2243 dm_crypt_clients_n--;
2244 crypt_calculate_pages_per_client();
2245 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2246}
2247
e889f97a
MB		 2248static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2249{
2250 struct crypt_config *cc = ti->private;
2251
33d2f09f 2252 if (crypt_integrity_aead(cc))
e889f97a
MB		 2253 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2254 else
2255 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2256
e889f97a
MB		 2257 if (cc->iv_size)
2258 /* at least a 64 bit sector number should fit in our buffer */
2259 cc->iv_size = max(cc->iv_size,
2260 (unsigned int)(sizeof(u64) / sizeof(u8)));
2261 else if (ivmode) {
2262 DMWARN("Selected cipher does not support IVs");
2263 ivmode = NULL;
2264 }
2265
2266 /* Choose ivmode, see comments at iv code. */
2267 if (ivmode == NULL)
2268 cc->iv_gen_ops = NULL;
2269 else if (strcmp(ivmode, "plain") == 0)
2270 cc->iv_gen_ops = &crypt_iv_plain_ops;
2271 else if (strcmp(ivmode, "plain64") == 0)
2272 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2273 else if (strcmp(ivmode, "plain64be") == 0)
2274 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2275 else if (strcmp(ivmode, "essiv") == 0)
2276 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2277 else if (strcmp(ivmode, "benbi") == 0)
2278 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2279 else if (strcmp(ivmode, "null") == 0)
2280 cc->iv_gen_ops = &crypt_iv_null_ops;
2281 else if (strcmp(ivmode, "lmk") == 0) {
2282 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2283 /*
2284 * Version 2 and 3 is recognised according
2285 * to length of provided multi-key string.
2286 * If present (version 3), last key is used as IV seed.
2287 * All keys (including IV seed) are always the same size.
2288 */
2289 if (cc->key_size % cc->key_parts) {
2290 cc->key_parts++;
2291 cc->key_extra_size = cc->key_size / cc->key_parts;
2292 }
2293 } else if (strcmp(ivmode, "tcw") == 0) {
2294 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2295 cc->key_parts += 2; /* IV + whitening */
2296 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2297 } else if (strcmp(ivmode, "random") == 0) {
2298 cc->iv_gen_ops = &crypt_iv_random_ops;
2299 /* Need storage space in integrity fields. */
2300 cc->integrity_iv_size = cc->iv_size;
2301 } else {
2302 ti->error = "Invalid IV mode";
2303 return -EINVAL;
2304 }
2305
2306 return 0;
2307}
2308
33d2f09f
MB		 2309/*
2310 * Workaround to parse cipher algorithm from crypto API spec.
2311 * The cc->cipher is currently used only in ESSIV.
2312 * This should be probably done by crypto-api calls (once available...)
2313 */
2314static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2315{
2316 const char *alg_name = NULL;
2317 char *start, *end;
2318
2319 if (crypt_integrity_aead(cc)) {
2320 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2321 if (!alg_name)
2322 return -EINVAL;
2323 if (crypt_integrity_hmac(cc)) {
2324 alg_name = strchr(alg_name, ',');
2325 if (!alg_name)
2326 return -EINVAL;
2327 }
2328 alg_name++;
2329 } else {
2330 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2331 if (!alg_name)
2332 return -EINVAL;
2333 }
2334
2335 start = strchr(alg_name, '(');
2336 end = strchr(alg_name, ')');
2337
2338 if (!start && !end) {
2339 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2340 return cc->cipher ? 0 : -ENOMEM;
2341 }
2342
2343 if (!start || !end || ++start >= end)
2344 return -EINVAL;
2345
2346 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2347 if (!cc->cipher)
2348 return -ENOMEM;
2349
2350 strncpy(cc->cipher, start, end - start);
2351
2352 return 0;
2353}
2354
2355/*
2356 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2357 * The HMAC is needed to calculate tag size (HMAC digest size).
2358 * This should be probably done by crypto-api calls (once available...)
2359 */
2360static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2361{
2362 char *start, *end, *mac_alg = NULL;
2363 struct crypto_ahash *mac;
2364
2365 if (!strstarts(cipher_api, "authenc("))
2366 return 0;
2367
2368 start = strchr(cipher_api, '(');
2369 end = strchr(cipher_api, ',');
2370 if (!start || !end || ++start > end)
2371 return -EINVAL;
2372
2373 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2374 if (!mac_alg)
2375 return -ENOMEM;
2376 strncpy(mac_alg, start, end - start);
2377
2378 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2379 kfree(mac_alg);
2380
2381 if (IS_ERR(mac))
2382 return PTR_ERR(mac);
2383
2384 cc->key_mac_size = crypto_ahash_digestsize(mac);
2385 crypto_free_ahash(mac);
2386
2387 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2388 if (!cc->authenc_key)
2389 return -ENOMEM;
2390
2391 return 0;
2392}
2393
2394static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2395 char **ivmode, char **ivopts)
2396{
2397 struct crypt_config *cc = ti->private;
2398 char *tmp, *cipher_api;
2399 int ret = -EINVAL;
2400
2401 cc->tfms_count = 1;
2402
2403 /*
2404 * New format (capi: prefix)
2405 * capi:cipher_api_spec-iv:ivopts
2406 */
2407 tmp = &cipher_in[strlen("capi:")];
2408 cipher_api = strsep(&tmp, "-");
2409 *ivmode = strsep(&tmp, ":");
2410 *ivopts = tmp;
2411
2412 if (*ivmode && !strcmp(*ivmode, "lmk"))
2413 cc->tfms_count = 64;
2414
2415 cc->key_parts = cc->tfms_count;
2416
2417 /* Allocate cipher */
2418 ret = crypt_alloc_tfms(cc, cipher_api);
2419 if (ret < 0) {
2420 ti->error = "Error allocating crypto tfm";
2421 return ret;
2422 }
2423
2424 /* Alloc AEAD, can be used only in new format. */
2425 if (crypt_integrity_aead(cc)) {
2426 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2427 if (ret < 0) {
2428 ti->error = "Invalid AEAD cipher spec";
2429 return -ENOMEM;
2430 }
2431 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2432 } else
2433 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2434
2435 ret = crypt_ctr_blkdev_cipher(cc);
2436 if (ret < 0) {
2437 ti->error = "Cannot allocate cipher string";
2438 return -ENOMEM;
2439 }
2440
2441 return 0;
2442}
2443
2444static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2445 char **ivmode, char **ivopts)
1da177e4 2446{
5ebaee6d 2447 struct crypt_config *cc = ti->private;
33d2f09f 2448 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2449 char *cipher_api = NULL;
fd2d231f 2450 int ret = -EINVAL;
31998ef1 2451 char dummy;
1da177e4 2452
33d2f09f 2453 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2454 ti->error = "Bad cipher specification";
1da177e4
LT		 2455 return -EINVAL;
2456 }
2457
5ebaee6d
MB		 2458 /*
2459 * Legacy dm-crypt cipher specification
d1f96423 2460 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2461 */
2462 tmp = cipher_in;
d1f96423
MB		 2463 keycount = strsep(&tmp, "-");
2464 cipher = strsep(&keycount, ":");
2465
2466 if (!keycount)
2467 cc->tfms_count = 1;
31998ef1 2468 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2469 !is_power_of_2(cc->tfms_count)) {
2470 ti->error = "Bad cipher key count specification";
2471 return -EINVAL;
2472 }
2473 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2474
2475 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2476 if (!cc->cipher)
2477 goto bad_mem;
2478
1da177e4 2479 chainmode = strsep(&tmp, "-");
33d2f09f
MB		 2480 *ivopts = strsep(&tmp, "-");
2481 *ivmode = strsep(&*ivopts, ":");
1da177e4
LT		 2482
2483 if (tmp)
5ebaee6d 2484 DMWARN("Ignoring unexpected additional cipher options");
1da177e4 2485
7dbcd137
MB		 2486 /*
2487 * For compatibility with the original dm-crypt mapping format, if
2488 * only the cipher name is supplied, use cbc-plain.
2489 */
33d2f09f 2490 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2491 chainmode = "cbc";
33d2f09f 2492 *ivmode = "plain";
1da177e4
LT		 2493 }
2494
33d2f09f 2495 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2496 ti->error = "IV mechanism required";
2497 return -EINVAL;
1da177e4
LT		 2498 }
2499
5ebaee6d
MB		 2500 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2501 if (!cipher_api)
2502 goto bad_mem;
2503
2504 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2505 "%s(%s)", chainmode, cipher);
2506 if (ret < 0) {
2507 kfree(cipher_api);
2508 goto bad_mem;
1da177e4
LT		 2509 }
2510
5ebaee6d 2511 /* Allocate cipher */
fd2d231f
MP		 2512 ret = crypt_alloc_tfms(cc, cipher_api);
2513 if (ret < 0) {
2514 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2515 kfree(cipher_api);
2516 return ret;
1da177e4 2517 }
bd86e320 2518 kfree(cipher_api);
1da177e4 2519
33d2f09f
MB		 2520 return 0;
2521bad_mem:
2522 ti->error = "Cannot allocate cipher strings";
2523 return -ENOMEM;
2524}
5ebaee6d 2525
33d2f09f
MB		 2526static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2527{
2528 struct crypt_config *cc = ti->private;
2529 char *ivmode = NULL, *ivopts = NULL;
2530 int ret;
2531
2532 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2533 if (!cc->cipher_string) {
2534 ti->error = "Cannot allocate cipher strings";
2535 return -ENOMEM;
1da177e4
LT		 2536 }
2537
33d2f09f
MB		 2538 if (strstarts(cipher_in, "capi:"))
2539 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2540 else
2541 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2542 if (ret)
2543 return ret;
2544
5ebaee6d 2545 /* Initialize IV */
e889f97a
MB		 2546 ret = crypt_ctr_ivmode(ti, ivmode);
2547 if (ret < 0)
33d2f09f 2548 return ret;
1da177e4 2549
da31a078
MB		 2550 /* Initialize and set key */
2551 ret = crypt_set_key(cc, key);
2552 if (ret < 0) {
2553 ti->error = "Error decoding and setting key";
33d2f09f 2554 return ret;
da31a078
MB		 2555 }
2556
28513fcc
MB		 2557 /* Allocate IV */
2558 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2559 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2560 if (ret < 0) {
2561 ti->error = "Error creating IV";
33d2f09f 2562 return ret;
28513fcc
MB		 2563 }
2564 }
1da177e4 2565
28513fcc
MB		 2566 /* Initialize IV (set keys for ESSIV etc) */
2567 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2568 ret = cc->iv_gen_ops->init(cc);
2569 if (ret < 0) {
2570 ti->error = "Error initialising IV";
33d2f09f 2571 return ret;
28513fcc 2572 }
b95bf2d3
MB		 2573 }
2574
dc94902b
OK		 2575 /* wipe the kernel key payload copy */
2576 if (cc->key_string)
2577 memset(cc->key, 0, cc->key_size * sizeof(u8));
2578
5ebaee6d 2579 return ret;
5ebaee6d 2580}
5ebaee6d 2581
ef43aa38
MB		 2582static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2583{
2584 struct crypt_config *cc = ti->private;
2585 struct dm_arg_set as;
5916a22b 2586 static const struct dm_arg _args[] = {
8f0009a2 2587 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2588 };
2589 unsigned int opt_params, val;
2590 const char *opt_string, *sval;
8f0009a2 2591 char dummy;
ef43aa38
MB		 2592 int ret;
2593
2594 /* Optional parameters */
2595 as.argc = argc;
2596 as.argv = argv;
2597
2598 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2599 if (ret)
2600 return ret;
2601
2602 while (opt_params--) {
2603 opt_string = dm_shift_arg(&as);
2604 if (!opt_string) {
2605 ti->error = "Not enough feature arguments";
2606 return -EINVAL;
2607 }
2608
2609 if (!strcasecmp(opt_string, "allow_discards"))
2610 ti->num_discard_bios = 1;
2611
2612 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2613 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2614
2615 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2616 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2617 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2618 if (val == 0 || val > MAX_TAG_SIZE) {
2619 ti->error = "Invalid integrity arguments";
2620 return -EINVAL;
2621 }
2622 cc->on_disk_tag_size = val;
2623 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2624 if (!strcasecmp(sval, "aead")) {
2625 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2626 } else if (strcasecmp(sval, "none")) {
2627 ti->error = "Unknown integrity profile";
2628 return -EINVAL;
2629 }
2630
2631 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2632 if (!cc->cipher_auth)
2633 return -ENOMEM;
ff3af92b 2634 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2635 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2636 cc->sector_size > 4096 ||
ff3af92b 2637 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2638 ti->error = "Invalid feature value for sector_size";
2639 return -EINVAL;
2640 }
783874b0
MB		 2641 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
2642 ti->error = "Device size is not multiple of sector_size feature";
2643 return -EINVAL;
2644 }
ff3af92b 2645 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2646 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2647 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2648 else {
ef43aa38
MB		 2649 ti->error = "Invalid feature arguments";
2650 return -EINVAL;
2651 }
2652 }
2653
2654 return 0;
5ebaee6d
MB		 2655}
2656
2657/*
2658 * Construct an encryption mapping:
c538f6ec 2659 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2660 */
2661static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2662{
2663 struct crypt_config *cc;
ed0302e8 2664 const char *devname = dm_table_device_name(ti->table);
c538f6ec 2665 int key_size;
ef43aa38 2666 unsigned int align_mask;
5ebaee6d
MB		 2667 unsigned long long tmpll;
2668 int ret;
ef43aa38 2669 size_t iv_size_padding, additional_req_size;
31998ef1 2670 char dummy;
772ae5f5 2671
772ae5f5 2672 if (argc < 5) {
5ebaee6d
MB		 2673 ti->error = "Not enough arguments";
2674 return -EINVAL;
1da177e4
LT		 2675 }
2676
c538f6ec
OK		 2677 key_size = get_key_size(&argv[1]);
2678 if (key_size < 0) {
2679 ti->error = "Cannot parse key size";
2680 return -EINVAL;
2681 }
5ebaee6d
MB		 2682
2683 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2684 if (!cc) {
2685 ti->error = "Cannot allocate encryption context";
2686 return -ENOMEM;
2687 }
69a8cfcd 2688 cc->key_size = key_size;
8f0009a2 2689 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2690 cc->sector_shift = 0;
5ebaee6d
MB		 2691
2692 ti->private = cc;
ef43aa38 2693
5059353d
MP		 2694 spin_lock(&dm_crypt_clients_lock);
2695 dm_crypt_clients_n++;
2696 crypt_calculate_pages_per_client();
2697 spin_unlock(&dm_crypt_clients_lock);
2698
2699 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
2700 if (ret < 0)
2701 goto bad;
2702
ef43aa38
MB		 2703 /* Optional parameters need to be read before cipher constructor */
2704 if (argc > 5) {
2705 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2706 if (ret)
2707 goto bad;
2708 }
2709
5ebaee6d
MB		 2710 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2711 if (ret < 0)
2712 goto bad;
2713
33d2f09f 2714 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2715 cc->dmreq_start = sizeof(struct aead_request);
2716 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2717 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2718 } else {
2719 cc->dmreq_start = sizeof(struct skcipher_request);
2720 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2721 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2722 }
d49ec52f
MP		 2723 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2724
ef43aa38 2725 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2726 /* Allocate the padding exactly */
2727 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2728 & align_mask;
d49ec52f
MP		 2729 } else {
2730 /*
2731 * If the cipher requires greater alignment than kmalloc
2732 * alignment, we don't know the exact position of the
2733 * initialization vector. We must assume worst case.
2734 */
ef43aa38 2735 iv_size_padding = align_mask;
d49ec52f 2736 }
ddd42edf 2737
ef43aa38
MB		 2738 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2739 additional_req_size = sizeof(struct dm_crypt_request) +
2740 iv_size_padding + cc->iv_size +
2741 cc->iv_size +
2742 sizeof(uint64_t) +
2743 sizeof(unsigned int);
2744
6f1c819c
KO		 2745 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
2746 if (ret) {
ddd42edf 2747 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2748 goto bad;
ddd42edf 2749 }
ddd42edf 2750
30187e1d 2751 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2752 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2753 ARCH_KMALLOC_MINALIGN);
298a9fa0 2754
6f1c819c
KO		 2755 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
2756 if (ret) {
72d94861 2757 ti->error = "Cannot allocate page mempool";
28513fcc 2758 goto bad;
1da177e4
LT		 2759 }
2760
6f1c819c
KO		 2761 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
2762 if (ret) {
6a24c718 2763 ti->error = "Cannot allocate crypt bioset";
28513fcc 2764 goto bad;
6a24c718
MB		 2765 }
2766
7145c241
MP		 2767 mutex_init(&cc->bio_alloc_lock);
2768
28513fcc 2769 ret = -EINVAL;
8f0009a2
MB		 2770 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2771 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2772 ti->error = "Invalid iv_offset sector";
28513fcc 2773 goto bad;
1da177e4 2774 }
4ee218cd 2775 cc->iv_offset = tmpll;
1da177e4 2776
e80d1c80
VG		 2777 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2778 if (ret) {
28513fcc
MB		 2779 ti->error = "Device lookup failed";
2780 goto bad;
2781 }
2782
e80d1c80 2783 ret = -EINVAL;
31998ef1 2784 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
72d94861 2785 ti->error = "Invalid device sector";
28513fcc 2786 goto bad;
1da177e4 2787 }
4ee218cd 2788 cc->start = tmpll;
1da177e4 2789
33d2f09f 2790 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2791 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2792 if (ret)
2793 goto bad;
2794
ef43aa38
MB		 2795 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2796 if (!cc->tag_pool_max_sectors)
2797 cc->tag_pool_max_sectors = 1;
f3396c58 2798
6f1c819c 2799 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 2800 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 2801 if (ret) {
ef43aa38
MB		 2802 ti->error = "Cannot allocate integrity tags mempool";
2803 goto bad;
772ae5f5 2804 }
583fe747
MP		 2805
2806 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 2807 }
2808
28513fcc 2809 ret = -ENOMEM;
ed0302e8
MM		 2810 cc->io_queue = alloc_workqueue("kcryptd_io/%s",
2811 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
2812 1, devname);
cabf08e4
MB		 2813 if (!cc->io_queue) {
2814 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2815 goto bad;
cabf08e4
MB		 2816 }
2817
f3396c58 2818 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
ed0302e8
MM		 2819 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
2820 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
2821 1, devname);
f3396c58 2822 else
ed0302e8 2823 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
a1b89132 2824 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 2825 num_online_cpus(), devname);
cabf08e4 2826 if (!cc->crypt_queue) {
9934a8be 2827 ti->error = "Couldn't create kcryptd queue";
28513fcc 2828 goto bad;
9934a8be
MB		 2829 }
2830
c7329eff 2831 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 2832 cc->write_tree = RB_ROOT;
dc267621 2833
ed0302e8 2834 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 2835 if (IS_ERR(cc->write_thread)) {
2836 ret = PTR_ERR(cc->write_thread);
2837 cc->write_thread = NULL;
2838 ti->error = "Couldn't spawn write thread";
2839 goto bad;
2840 }
2841 wake_up_process(cc->write_thread);
2842
55a62eef 2843 ti->num_flush_bios = 1;
983c7db3 2844
1da177e4
LT		 2845 return 0;
2846
28513fcc
MB		 2847bad:
2848 crypt_dtr(ti);
2849 return ret;
1da177e4
LT		 2850}
2851
7de3ee57 2852static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2853{
028867ac 2854 struct dm_crypt_io *io;
49a8a920 2855 struct crypt_config *cc = ti->private;
647c7db1 2856
772ae5f5 2857 /*
28a8f0d3
MC		 2858 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2859 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2860 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2861 */
1eff9d32 2862 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2863 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 2864 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 2865 if (bio_sectors(bio))
4f024f37
KO		 2866 bio->bi_iter.bi_sector = cc->start +
2867 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2868 return DM_MAPIO_REMAPPED;
2869 }
1da177e4 2870
4e870e94
MP		 2871 /*
2872 * Check if bio is too large, split as needed.
2873 */
2874 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2875 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2876 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2877
8f0009a2
MB		 2878 /*
2879 * Ensure that bio is a multiple of internal sector encryption size
2880 * and is aligned to this size as defined in IO hints.
2881 */
2882 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 2883 return DM_MAPIO_KILL;
8f0009a2
MB		 2884
2885 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 2886 return DM_MAPIO_KILL;
8f0009a2 2887
298a9fa0
MP		 2888 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2889 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2890
2891 if (cc->on_disk_tag_size) {
583fe747 2892 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 2893
2894 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 2895 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 2896 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2897 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2898 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 2899 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 2900 io->integrity_metadata_from_pool = true;
2901 }
2902 }
2903
33d2f09f 2904 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2905 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2906 else
2907 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2908
20c82538
MB		 2909 if (bio_data_dir(io->base_bio) == READ) {
2910 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2911 kcryptd_queue_read(io);
20c82538 2912 } else
cabf08e4 2913 kcryptd_queue_crypt(io);
1da177e4 2914
d2a7ad29 2915 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2916}
2917
fd7c092e
MP		 2918static void crypt_status(struct dm_target *ti, status_type_t type,
2919 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2920{
5ebaee6d 2921 struct crypt_config *cc = ti->private;
fd7c092e 2922 unsigned i, sz = 0;
f3396c58 2923 int num_feature_args = 0;
1da177e4
LT		 2924
2925 switch (type) {
2926 case STATUSTYPE_INFO:
2927 result[0] = '\0';
2928 break;
2929
2930 case STATUSTYPE_TABLE:
7dbcd137 2931 DMEMIT("%s ", cc->cipher_string);
1da177e4 2932
c538f6ec
OK		 2933 if (cc->key_size > 0) {
2934 if (cc->key_string)
2935 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2936 else
2937 for (i = 0; i < cc->key_size; i++)
2938 DMEMIT("%02x", cc->key[i]);
2939 } else
fd7c092e 2940 DMEMIT("-");
1da177e4 2941
4ee218cd
AM		 2942 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2943 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2944
f3396c58
MP		 2945 num_feature_args += !!ti->num_discard_bios;
2946 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2947 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2948 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2949 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2950 if (cc->on_disk_tag_size)
2951 num_feature_args++;
f3396c58
MP		 2952 if (num_feature_args) {
2953 DMEMIT(" %d", num_feature_args);
2954 if (ti->num_discard_bios)
2955 DMEMIT(" allow_discards");
2956 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2957 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2958 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2959 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2960 if (cc->on_disk_tag_size)
2961 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2962 if (cc->sector_size != (1 << SECTOR_SHIFT))
2963 DMEMIT(" sector_size:%d", cc->sector_size);
2964 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2965 DMEMIT(" iv_large_sectors");
f3396c58 2966 }
772ae5f5 2967
1da177e4
LT		 2968 break;
2969 }
1da177e4
LT		 2970}
2971
e48d4bbf
MB		 2972static void crypt_postsuspend(struct dm_target *ti)
2973{
2974 struct crypt_config *cc = ti->private;
2975
2976 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2977}
2978
2979static int crypt_preresume(struct dm_target *ti)
2980{
2981 struct crypt_config *cc = ti->private;
2982
2983 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
2984 DMERR("aborting resume - crypt key is not set.");
2985 return -EAGAIN;
2986 }
2987
2988 return 0;
2989}
2990
2991static void crypt_resume(struct dm_target *ti)
2992{
2993 struct crypt_config *cc = ti->private;
2994
2995 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2996}
2997
2998/* Message interface
2999 * key set <key>
3000 * key wipe
3001 */
1eb5fa84
MS		 3002static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3003 char *result, unsigned maxlen)
e48d4bbf
MB		 3004{
3005 struct crypt_config *cc = ti->private;
c538f6ec 3006 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3007
3008 if (argc < 2)
3009 goto error;
3010
498f0103 3011 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3012 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3013 DMWARN("not suspended during key manipulation.");
3014 return -EINVAL;
3015 }
498f0103 3016 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3017 /* The key size may not be changed. */
3018 key_size = get_key_size(&argv[2]);
3019 if (key_size < 0 || cc->key_size != key_size) {
3020 memset(argv[2], '0', strlen(argv[2]));
3021 return -EINVAL;
3022 }
3023
542da317
MB		 3024 ret = crypt_set_key(cc, argv[2]);
3025 if (ret)
3026 return ret;
3027 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3028 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3029 /* wipe the kernel key payload copy */
3030 if (cc->key_string)
3031 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3032 return ret;
3033 }
498f0103 3034 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 3035 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
3036 ret = cc->iv_gen_ops->wipe(cc);
3037 if (ret)
3038 return ret;
3039 }
e48d4bbf 3040 return crypt_wipe_key(cc);
542da317 3041 }
e48d4bbf
MB		 3042 }
3043
3044error:
3045 DMWARN("unrecognised message received.");
3046 return -EINVAL;
3047}
3048
af4874e0
MS		 3049static int crypt_iterate_devices(struct dm_target *ti,
3050 iterate_devices_callout_fn fn, void *data)
3051{
3052 struct crypt_config *cc = ti->private;
3053
5dea271b 3054 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3055}
3056
586b286b
MS		 3057static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3058{
8f0009a2
MB		 3059 struct crypt_config *cc = ti->private;
3060
586b286b
MS		 3061 /*
3062 * Unfortunate constraint that is required to avoid the potential
3063 * for exceeding underlying device's max_segments limits -- due to
3064 * crypt_alloc_buffer() possibly allocating pages for the encryption
3065 * bio that are not as physically contiguous as the original bio.
3066 */
3067 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3068
bc9e9cf0
MP		 3069 limits->logical_block_size =
3070 max_t(unsigned short, limits->logical_block_size, cc->sector_size);
3071 limits->physical_block_size =
3072 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3073 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3074}
3075
1da177e4
LT		 3076static struct target_type crypt_target = {
3077 .name = "crypt",
dc94902b 3078 .version = {1, 18, 1},
1da177e4
LT		 3079 .module = THIS_MODULE,
3080 .ctr = crypt_ctr,
3081 .dtr = crypt_dtr,
3082 .map = crypt_map,
3083 .status = crypt_status,
e48d4bbf
MB		 3084 .postsuspend = crypt_postsuspend,
3085 .preresume = crypt_preresume,
3086 .resume = crypt_resume,
3087 .message = crypt_message,
af4874e0 3088 .iterate_devices = crypt_iterate_devices,
586b286b 3089 .io_hints = crypt_io_hints,
1da177e4
LT		 3090};
3091
3092static int __init dm_crypt_init(void)
3093{
3094 int r;
3095
1da177e4 3096 r = dm_register_target(&crypt_target);
94f5e024 3097 if (r < 0)
72d94861 3098 DMERR("register failed %d", r);
1da177e4 3099
1da177e4
LT		 3100 return r;
3101}
3102
3103static void __exit dm_crypt_exit(void)
3104{
10d3bd09 3105 dm_unregister_target(&crypt_target);
1da177e4
LT		 3106}
3107
3108module_init(dm_crypt_init);
3109module_exit(dm_crypt_exit);
3110
bf14299f 3111MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3112MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3113MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)