projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
keys: Replace uid/gid/perm permissions checking with an ACL
[linux-2.6-block.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
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;
8d683dcd 52 u64 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];
8d683dcd 84 u64 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;
8d683dcd 163 u64 iv_offset;
1da177e4 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;
b95bf2d3 335
c07c88f5
KC		 336 err = crypto_shash_digest(desc, cc->key, cc->key_size, essiv->salt);
337 shash_desc_zero(desc);
b95bf2d3
MB		 338 if (err)
339 return err;
340
fd2d231f 341 essiv_tfm = cc->iv_private;
c0297721 342
fd2d231f 343 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
c07c88f5 344 crypto_shash_digestsize(essiv->hash_tfm));
fd2d231f
MP		 345 if (err)
346 return err;
c0297721
AK		 347
348 return 0;
b95bf2d3
MB		 349}
350
542da317
MB		 351/* Wipe salt and reset key derived from volume key */
352static int crypt_iv_essiv_wipe(struct crypt_config *cc)
353{
354 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
c07c88f5 355 unsigned salt_size = crypto_shash_digestsize(essiv->hash_tfm);
c0297721 356 struct crypto_cipher *essiv_tfm;
fd2d231f 357 int r, err = 0;
542da317
MB		 358
359 memset(essiv->salt, 0, salt_size);
360
fd2d231f
MP		 361 essiv_tfm = cc->iv_private;
362 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
363 if (r)
364 err = r;
c0297721
AK		 365
366 return err;
367}
368
86f917ad
EB		 369/* Allocate the cipher for ESSIV */
370static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc,
371 struct dm_target *ti,
372 const u8 *salt,
373 unsigned int saltsize)
c0297721
AK		 374{
375 struct crypto_cipher *essiv_tfm;
376 int err;
377
378 /* Setup the essiv_tfm with the given salt */
1ad0f160 379 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, 0);
c0297721
AK		 380 if (IS_ERR(essiv_tfm)) {
381 ti->error = "Error allocating crypto tfm for ESSIV";
382 return essiv_tfm;
383 }
384
ef43aa38 385 if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) {
c0297721
AK		 386 ti->error = "Block size of ESSIV cipher does "
387 "not match IV size of block cipher";
388 crypto_free_cipher(essiv_tfm);
389 return ERR_PTR(-EINVAL);
390 }
391
392 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
393 if (err) {
394 ti->error = "Failed to set key for ESSIV cipher";
395 crypto_free_cipher(essiv_tfm);
396 return ERR_PTR(err);
397 }
398
399 return essiv_tfm;
542da317
MB		 400}
401
60473592
MB		 402static void crypt_iv_essiv_dtr(struct crypt_config *cc)
403{
c0297721 404 struct crypto_cipher *essiv_tfm;
60473592
MB		 405 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
406
c07c88f5 407 crypto_free_shash(essiv->hash_tfm);
b95bf2d3
MB		 408 essiv->hash_tfm = NULL;
409
410 kzfree(essiv->salt);
411 essiv->salt = NULL;
c0297721 412
fd2d231f 413 essiv_tfm = cc->iv_private;
c0297721 414
fd2d231f
MP		 415 if (essiv_tfm)
416 crypto_free_cipher(essiv_tfm);
c0297721 417
fd2d231f 418 cc->iv_private = NULL;
60473592
MB		 419}
420
1da177e4 421static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
d469f841 422 const char *opts)
1da177e4 423{
5861f1be 424 struct crypto_cipher *essiv_tfm = NULL;
c07c88f5 425 struct crypto_shash *hash_tfm = NULL;
5861f1be 426 u8 *salt = NULL;
fd2d231f 427 int err;
1da177e4 428
5861f1be 429 if (!opts) {
72d94861 430 ti->error = "Digest algorithm missing for ESSIV mode";
1da177e4
LT		 431 return -EINVAL;
432 }
433
b95bf2d3 434 /* Allocate hash algorithm */
c07c88f5 435 hash_tfm = crypto_alloc_shash(opts, 0, 0);
35058687 436 if (IS_ERR(hash_tfm)) {
72d94861 437 ti->error = "Error initializing ESSIV hash";
5861f1be
MB		 438 err = PTR_ERR(hash_tfm);
439 goto bad;
1da177e4
LT		 440 }
441
c07c88f5 442 salt = kzalloc(crypto_shash_digestsize(hash_tfm), GFP_KERNEL);
5861f1be 443 if (!salt) {
72d94861 444 ti->error = "Error kmallocing salt storage in ESSIV";
5861f1be
MB		 445 err = -ENOMEM;
446 goto bad;
1da177e4
LT		 447 }
448
b95bf2d3 449 cc->iv_gen_private.essiv.salt = salt;
b95bf2d3
MB		 450 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
451
86f917ad 452 essiv_tfm = alloc_essiv_cipher(cc, ti, salt,
c07c88f5 453 crypto_shash_digestsize(hash_tfm));
fd2d231f
MP		 454 if (IS_ERR(essiv_tfm)) {
455 crypt_iv_essiv_dtr(cc);
456 return PTR_ERR(essiv_tfm);
c0297721 457 }
fd2d231f 458 cc->iv_private = essiv_tfm;
c0297721 459
1da177e4 460 return 0;
5861f1be
MB		 461
462bad:
5861f1be 463 if (hash_tfm && !IS_ERR(hash_tfm))
c07c88f5 464 crypto_free_shash(hash_tfm);
b95bf2d3 465 kfree(salt);
5861f1be 466 return err;
1da177e4
LT		 467}
468
2dc5327d
MB		 469static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
470 struct dm_crypt_request *dmreq)
1da177e4 471{
fd2d231f 472 struct crypto_cipher *essiv_tfm = cc->iv_private;
c0297721 473
1da177e4 474 memset(iv, 0, cc->iv_size);
283a8328 475 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721
AK		 476 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
477
1da177e4
LT		 478 return 0;
479}
480
48527fa7
RS		 481static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
482 const char *opts)
483{
bbdb23b5 484 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
f0d1b0b3 485 int log = ilog2(bs);
48527fa7
RS		 486
487 /* we need to calculate how far we must shift the sector count
488 * to get the cipher block count, we use this shift in _gen */
489
490 if (1 << log != bs) {
491 ti->error = "cypher blocksize is not a power of 2";
492 return -EINVAL;
493 }
494
495 if (log > 9) {
496 ti->error = "cypher blocksize is > 512";
497 return -EINVAL;
498 }
499
60473592 500 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 501
502 return 0;
503}
504
505static void crypt_iv_benbi_dtr(struct crypt_config *cc)
506{
48527fa7
RS		 507}
508
2dc5327d
MB		 509static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
510 struct dm_crypt_request *dmreq)
48527fa7 511{
79066ad3
HX		 512 __be64 val;
513
48527fa7 514 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 515
2dc5327d 516 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 517 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 518
1da177e4
LT		 519 return 0;
520}
521
2dc5327d
MB		 522static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
523 struct dm_crypt_request *dmreq)
46b47730
LN		 524{
525 memset(iv, 0, cc->iv_size);
526
527 return 0;
528}
529
34745785
MB		 530static void crypt_iv_lmk_dtr(struct crypt_config *cc)
531{
532 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
533
534 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
535 crypto_free_shash(lmk->hash_tfm);
536 lmk->hash_tfm = NULL;
537
538 kzfree(lmk->seed);
539 lmk->seed = NULL;
540}
541
542static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
543 const char *opts)
544{
545 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
546
8f0009a2
MB		 547 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
548 ti->error = "Unsupported sector size for LMK";
549 return -EINVAL;
550 }
551
34745785
MB		 552 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
553 if (IS_ERR(lmk->hash_tfm)) {
554 ti->error = "Error initializing LMK hash";
555 return PTR_ERR(lmk->hash_tfm);
556 }
557
558 /* No seed in LMK version 2 */
559 if (cc->key_parts == cc->tfms_count) {
560 lmk->seed = NULL;
561 return 0;
562 }
563
564 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
565 if (!lmk->seed) {
566 crypt_iv_lmk_dtr(cc);
567 ti->error = "Error kmallocing seed storage in LMK";
568 return -ENOMEM;
569 }
570
571 return 0;
572}
573
574static int crypt_iv_lmk_init(struct crypt_config *cc)
575{
576 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
577 int subkey_size = cc->key_size / cc->key_parts;
578
579 /* LMK seed is on the position of LMK_KEYS + 1 key */
580 if (lmk->seed)
581 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
582 crypto_shash_digestsize(lmk->hash_tfm));
583
584 return 0;
585}
586
587static int crypt_iv_lmk_wipe(struct crypt_config *cc)
588{
589 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
590
591 if (lmk->seed)
592 memset(lmk->seed, 0, LMK_SEED_SIZE);
593
594 return 0;
595}
596
597static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
598 struct dm_crypt_request *dmreq,
599 u8 *data)
600{
601 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 602 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 603 struct md5_state md5state;
da31a078 604 __le32 buf[4];
34745785
MB		 605 int i, r;
606
b6106265 607 desc->tfm = lmk->hash_tfm;
34745785 608
b6106265 609 r = crypto_shash_init(desc);
34745785
MB		 610 if (r)
611 return r;
612
613 if (lmk->seed) {
b6106265 614 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 615 if (r)
616 return r;
617 }
618
619 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 620 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 621 if (r)
622 return r;
623
624 /* Sector is cropped to 56 bits here */
625 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
626 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
627 buf[2] = cpu_to_le32(4024);
628 buf[3] = 0;
b6106265 629 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 630 if (r)
631 return r;
632
633 /* No MD5 padding here */
b6106265 634 r = crypto_shash_export(desc, &md5state);
34745785
MB		 635 if (r)
636 return r;
637
638 for (i = 0; i < MD5_HASH_WORDS; i++)
639 __cpu_to_le32s(&md5state.hash[i]);
640 memcpy(iv, &md5state.hash, cc->iv_size);
641
642 return 0;
643}
644
645static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
646 struct dm_crypt_request *dmreq)
647{
ef43aa38 648 struct scatterlist *sg;
34745785
MB		 649 u8 *src;
650 int r = 0;
651
652 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 653 sg = crypt_get_sg_data(cc, dmreq->sg_in);
654 src = kmap_atomic(sg_page(sg));
655 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 656 kunmap_atomic(src);
34745785
MB		 657 } else
658 memset(iv, 0, cc->iv_size);
659
660 return r;
661}
662
663static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
664 struct dm_crypt_request *dmreq)
665{
ef43aa38 666 struct scatterlist *sg;
34745785
MB		 667 u8 *dst;
668 int r;
669
670 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
671 return 0;
672
ef43aa38
MB		 673 sg = crypt_get_sg_data(cc, dmreq->sg_out);
674 dst = kmap_atomic(sg_page(sg));
675 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 676
677 /* Tweak the first block of plaintext sector */
678 if (!r)
ef43aa38 679 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 680
c2e022cb 681 kunmap_atomic(dst);
34745785
MB		 682 return r;
683}
684
ed04d981
MB		 685static void crypt_iv_tcw_dtr(struct crypt_config *cc)
686{
687 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
688
689 kzfree(tcw->iv_seed);
690 tcw->iv_seed = NULL;
691 kzfree(tcw->whitening);
692 tcw->whitening = NULL;
693
694 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
695 crypto_free_shash(tcw->crc32_tfm);
696 tcw->crc32_tfm = NULL;
697}
698
699static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
700 const char *opts)
701{
702 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
703
8f0009a2
MB		 704 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
705 ti->error = "Unsupported sector size for TCW";
706 return -EINVAL;
707 }
708
ed04d981
MB		 709 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
710 ti->error = "Wrong key size for TCW";
711 return -EINVAL;
712 }
713
714 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
715 if (IS_ERR(tcw->crc32_tfm)) {
716 ti->error = "Error initializing CRC32 in TCW";
717 return PTR_ERR(tcw->crc32_tfm);
718 }
719
720 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
721 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
722 if (!tcw->iv_seed || !tcw->whitening) {
723 crypt_iv_tcw_dtr(cc);
724 ti->error = "Error allocating seed storage in TCW";
725 return -ENOMEM;
726 }
727
728 return 0;
729}
730
731static int crypt_iv_tcw_init(struct crypt_config *cc)
732{
733 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
734 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
735
736 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
737 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
738 TCW_WHITENING_SIZE);
739
740 return 0;
741}
742
743static int crypt_iv_tcw_wipe(struct crypt_config *cc)
744{
745 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
746
747 memset(tcw->iv_seed, 0, cc->iv_size);
748 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
749
750 return 0;
751}
752
753static int crypt_iv_tcw_whitening(struct crypt_config *cc,
754 struct dm_crypt_request *dmreq,
755 u8 *data)
756{
757 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 758 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 759 u8 buf[TCW_WHITENING_SIZE];
b6106265 760 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 761 int i, r;
762
763 /* xor whitening with sector number */
45fe93df
AB		 764 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
765 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 766
767 /* calculate crc32 for every 32bit part and xor it */
b6106265 768 desc->tfm = tcw->crc32_tfm;
ed04d981 769 for (i = 0; i < 4; i++) {
b6106265 770 r = crypto_shash_init(desc);
ed04d981
MB		 771 if (r)
772 goto out;
b6106265 773 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 774 if (r)
775 goto out;
b6106265 776 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 777 if (r)
778 goto out;
779 }
780 crypto_xor(&buf[0], &buf[12], 4);
781 crypto_xor(&buf[4], &buf[8], 4);
782
783 /* apply whitening (8 bytes) to whole sector */
784 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
785 crypto_xor(data + i * 8, buf, 8);
786out:
1a71d6ff 787 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 788 return r;
789}
790
791static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
792 struct dm_crypt_request *dmreq)
793{
ef43aa38 794 struct scatterlist *sg;
ed04d981 795 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 796 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 797 u8 *src;
798 int r = 0;
799
800 /* Remove whitening from ciphertext */
801 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 802 sg = crypt_get_sg_data(cc, dmreq->sg_in);
803 src = kmap_atomic(sg_page(sg));
804 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 805 kunmap_atomic(src);
806 }
807
808 /* Calculate IV */
45fe93df 809 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 810 if (cc->iv_size > 8)
45fe93df
AB		 811 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
812 cc->iv_size - 8);
ed04d981
MB		 813
814 return r;
815}
816
817static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
818 struct dm_crypt_request *dmreq)
819{
ef43aa38 820 struct scatterlist *sg;
ed04d981
MB		 821 u8 *dst;
822 int r;
823
824 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
825 return 0;
826
827 /* Apply whitening on ciphertext */
ef43aa38
MB		 828 sg = crypt_get_sg_data(cc, dmreq->sg_out);
829 dst = kmap_atomic(sg_page(sg));
830 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 831 kunmap_atomic(dst);
832
833 return r;
834}
835
ef43aa38
MB		 836static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
837 struct dm_crypt_request *dmreq)
838{
839 /* Used only for writes, there must be an additional space to store IV */
840 get_random_bytes(iv, cc->iv_size);
841 return 0;
842}
843
1b1b58f5 844static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 845 .generator = crypt_iv_plain_gen
846};
847
1b1b58f5 848static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 849 .generator = crypt_iv_plain64_gen
850};
851
7e3fd855
MB		 852static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
853 .generator = crypt_iv_plain64be_gen
854};
855
1b1b58f5 856static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 857 .ctr = crypt_iv_essiv_ctr,
858 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 859 .init = crypt_iv_essiv_init,
542da317 860 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 861 .generator = crypt_iv_essiv_gen
862};
863
1b1b58f5 864static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 865 .ctr = crypt_iv_benbi_ctr,
866 .dtr = crypt_iv_benbi_dtr,
867 .generator = crypt_iv_benbi_gen
868};
1da177e4 869
1b1b58f5 870static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 871 .generator = crypt_iv_null_gen
872};
873
1b1b58f5 874static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 875 .ctr = crypt_iv_lmk_ctr,
876 .dtr = crypt_iv_lmk_dtr,
877 .init = crypt_iv_lmk_init,
878 .wipe = crypt_iv_lmk_wipe,
879 .generator = crypt_iv_lmk_gen,
880 .post = crypt_iv_lmk_post
881};
882
1b1b58f5 883static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 884 .ctr = crypt_iv_tcw_ctr,
885 .dtr = crypt_iv_tcw_dtr,
886 .init = crypt_iv_tcw_init,
887 .wipe = crypt_iv_tcw_wipe,
888 .generator = crypt_iv_tcw_gen,
889 .post = crypt_iv_tcw_post
890};
891
ef43aa38
MB		 892static struct crypt_iv_operations crypt_iv_random_ops = {
893 .generator = crypt_iv_random_gen
894};
895
896/*
897 * Integrity extensions
898 */
899static bool crypt_integrity_aead(struct crypt_config *cc)
900{
901 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
902}
903
904static bool crypt_integrity_hmac(struct crypt_config *cc)
905{
33d2f09f 906 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 907}
908
909/* Get sg containing data */
910static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
911 struct scatterlist *sg)
912{
33d2f09f 913 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 914 return &sg[2];
915
916 return sg;
917}
918
919static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
920{
921 struct bio_integrity_payload *bip;
922 unsigned int tag_len;
923 int ret;
924
925 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
926 return 0;
927
928 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
929 if (IS_ERR(bip))
930 return PTR_ERR(bip);
931
ff0c129d 932 tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift);
ef43aa38
MB		 933
934 bip->bip_iter.bi_size = tag_len;
935 bip->bip_iter.bi_sector = io->cc->start + io->sector;
936
ef43aa38
MB		 937 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
938 tag_len, offset_in_page(io->integrity_metadata));
939 if (unlikely(ret != tag_len))
940 return -ENOMEM;
941
942 return 0;
943}
944
945static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
946{
947#ifdef CONFIG_BLK_DEV_INTEGRITY
948 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
7a1cd723 949 struct mapped_device *md = dm_table_get_md(ti->table);
ef43aa38
MB		 950
951 /* From now we require underlying device with our integrity profile */
952 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
953 ti->error = "Integrity profile not supported.";
954 return -EINVAL;
955 }
956
583fe747
MP		 957 if (bi->tag_size != cc->on_disk_tag_size ||
958 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 959 ti->error = "Integrity profile tag size mismatch.";
960 return -EINVAL;
961 }
583fe747
MP		 962 if (1 << bi->interval_exp != cc->sector_size) {
963 ti->error = "Integrity profile sector size mismatch.";
964 return -EINVAL;
965 }
ef43aa38 966
33d2f09f 967 if (crypt_integrity_aead(cc)) {
ef43aa38 968 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
7a1cd723 969 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md),
ef43aa38
MB		 970 cc->integrity_tag_size, cc->integrity_iv_size);
971
972 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
973 ti->error = "Integrity AEAD auth tag size is not supported.";
974 return -EINVAL;
975 }
976 } else if (cc->integrity_iv_size)
7a1cd723 977 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md),
ef43aa38
MB		 978 cc->integrity_iv_size);
979
980 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
981 ti->error = "Not enough space for integrity tag in the profile.";
982 return -EINVAL;
983 }
984
985 return 0;
986#else
987 ti->error = "Integrity profile not supported.";
988 return -EINVAL;
989#endif
990}
991
d469f841
MB		 992static void crypt_convert_init(struct crypt_config *cc,
993 struct convert_context *ctx,
994 struct bio *bio_out, struct bio *bio_in,
fcd369da 995 sector_t sector)
1da177e4
LT		 996{
997 ctx->bio_in = bio_in;
998 ctx->bio_out = bio_out;
003b5c57
KO		 999 if (bio_in)
1000 ctx->iter_in = bio_in->bi_iter;
1001 if (bio_out)
1002 ctx->iter_out = bio_out->bi_iter;
c66029f4 1003 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1004 init_completion(&ctx->restart);
1da177e4
LT		 1005}
1006
b2174eeb 1007static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1008 void *req)
b2174eeb
HY		 1009{
1010 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1011}
1012
ef43aa38 1013static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1014{
ef43aa38 1015 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1016}
1017
2dc5327d
MB		 1018static u8 *iv_of_dmreq(struct crypt_config *cc,
1019 struct dm_crypt_request *dmreq)
1020{
33d2f09f 1021 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1022 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1023 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1024 else
1025 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1026 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1027}
1028
ef43aa38
MB		 1029static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1030 struct dm_crypt_request *dmreq)
1031{
1032 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1033}
1034
c13b5487 1035static __le64 *org_sector_of_dmreq(struct crypt_config *cc,
ef43aa38
MB		 1036 struct dm_crypt_request *dmreq)
1037{
1038 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
c13b5487 1039 return (__le64 *) ptr;
ef43aa38
MB		 1040}
1041
1042static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1043 struct dm_crypt_request *dmreq)
1044{
1045 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1046 cc->iv_size + sizeof(uint64_t);
1047 return (unsigned int*)ptr;
1048}
1049
1050static void *tag_from_dmreq(struct crypt_config *cc,
1051 struct dm_crypt_request *dmreq)
1052{
1053 struct convert_context *ctx = dmreq->ctx;
1054 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1055
1056 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1057 cc->on_disk_tag_size];
1058}
1059
1060static void *iv_tag_from_dmreq(struct crypt_config *cc,
1061 struct dm_crypt_request *dmreq)
1062{
1063 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1064}
1065
1066static int crypt_convert_block_aead(struct crypt_config *cc,
1067 struct convert_context *ctx,
1068 struct aead_request *req,
1069 unsigned int tag_offset)
01482b76 1070{
003b5c57
KO		 1071 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1072 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1073 struct dm_crypt_request *dmreq;
ef43aa38 1074 u8 *iv, *org_iv, *tag_iv, *tag;
c13b5487 1075 __le64 *sector;
ef43aa38
MB		 1076 int r = 0;
1077
1078 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1079
8f0009a2 1080 /* Reject unexpected unaligned bio. */
0440d5c0 1081 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1082 return -EIO;
3a7f6c99 1083
b2174eeb 1084 dmreq = dmreq_of_req(cc, req);
ef43aa38 1085 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1086 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1087 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1088 dmreq->ctx = ctx;
1089
1090 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1091
1092 sector = org_sector_of_dmreq(cc, dmreq);
1093 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1094
2dc5327d 1095 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1096 org_iv = org_iv_of_dmreq(cc, dmreq);
1097 tag = tag_from_dmreq(cc, dmreq);
1098 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1099
1100 /* AEAD request:
1101 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1102 * | (authenticated) | (auth+encryption) | |
1103 * | sector_LE | IV | sector in/out | tag in/out |
1104 */
1105 sg_init_table(dmreq->sg_in, 4);
1106 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1107 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1108 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1109 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1110
1111 sg_init_table(dmreq->sg_out, 4);
1112 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1113 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1114 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1115 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1116
1117 if (cc->iv_gen_ops) {
1118 /* For READs use IV stored in integrity metadata */
1119 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1120 memcpy(org_iv, tag_iv, cc->iv_size);
1121 } else {
1122 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1123 if (r < 0)
1124 return r;
1125 /* Store generated IV in integrity metadata */
1126 if (cc->integrity_iv_size)
1127 memcpy(tag_iv, org_iv, cc->iv_size);
1128 }
1129 /* Working copy of IV, to be modified in crypto API */
1130 memcpy(iv, org_iv, cc->iv_size);
1131 }
1132
1133 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1134 if (bio_data_dir(ctx->bio_in) == WRITE) {
1135 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1136 cc->sector_size, iv);
ef43aa38
MB		 1137 r = crypto_aead_encrypt(req);
1138 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1139 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1140 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1141 } else {
1142 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1143 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1144 r = crypto_aead_decrypt(req);
1145 }
1146
f710126c
MB		 1147 if (r == -EBADMSG) {
1148 char b[BDEVNAME_SIZE];
1149 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 1150 (unsigned long long)le64_to_cpu(*sector));
f710126c 1151 }
ef43aa38
MB		 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 1171 u8 *iv, *org_iv, *tag_iv;
c13b5487 1172 __le64 *sector;
ef43aa38 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{
1da177e4 1448 struct bio_vec *bv;
6dc4f100 1449 struct bvec_iter_all iter_all;
1da177e4 1450
2b070cfe 1451 bio_for_each_segment_all(bv, clone, iter_all) {
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 1793 if (error == -EBADMSG) {
f710126c
MB		 1794 char b[BDEVNAME_SIZE];
1795 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 1796 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 1797 io->error = BLK_STS_PROTECTION;
ef43aa38 1798 } else if (error < 0)
4e4cbee9 1799 io->error = BLK_STS_IOERR;
72c6e7af 1800
298a9fa0 1801 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1802
40b6229b 1803 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1804 return;
95497a96
MB		 1805
1806 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1807 kcryptd_crypt_read_done(io);
95497a96 1808 else
72c6e7af 1809 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1810}
1811
395b167c 1812static void kcryptd_crypt(struct work_struct *work)
1da177e4 1813{
028867ac 1814 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1815
cabf08e4 1816 if (bio_data_dir(io->base_bio) == READ)
395b167c 1817 kcryptd_crypt_read_convert(io);
4e4eef64 1818 else
395b167c 1819 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1820}
1821
395b167c 1822static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1823{
49a8a920 1824 struct crypt_config *cc = io->cc;
cabf08e4 1825
395b167c
AK		 1826 INIT_WORK(&io->work, kcryptd_crypt);
1827 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1828}
1829
ef43aa38 1830static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 1831{
ef43aa38
MB		 1832 if (!cc->cipher_tfm.tfms_aead)
1833 return;
1da177e4 1834
ef43aa38
MB		 1835 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1836 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1837 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 1838 }
1839
ef43aa38
MB		 1840 kfree(cc->cipher_tfm.tfms_aead);
1841 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 1842}
1843
ef43aa38 1844static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1845{
d1f96423
MB		 1846 unsigned i;
1847
ef43aa38 1848 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1849 return;
1850
d1f96423 1851 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1852 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1853 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1854 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1855 }
fd2d231f 1856
ef43aa38
MB		 1857 kfree(cc->cipher_tfm.tfms);
1858 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1859}
1860
ef43aa38
MB		 1861static void crypt_free_tfms(struct crypt_config *cc)
1862{
33d2f09f 1863 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1864 crypt_free_tfms_aead(cc);
1865 else
1866 crypt_free_tfms_skcipher(cc);
1867}
1868
1869static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1870{
d1f96423
MB		 1871 unsigned i;
1872 int err;
1873
6396bb22
KC		 1874 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
1875 sizeof(struct crypto_skcipher *),
1876 GFP_KERNEL);
ef43aa38 1877 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1878 return -ENOMEM;
1879
d1f96423 1880 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1881 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1882 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1883 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1884 crypt_free_tfms(cc);
d1f96423
MB		 1885 return err;
1886 }
1887 }
1888
af331eba
EB		 1889 /*
1890 * dm-crypt performance can vary greatly depending on which crypto
1891 * algorithm implementation is used. Help people debug performance
1892 * problems by logging the ->cra_driver_name.
1893 */
7a1cd723 1894 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 1895 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 1896 return 0;
1897}
1898
ef43aa38
MB		 1899static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1900{
ef43aa38
MB		 1901 int err;
1902
1903 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1904 if (!cc->cipher_tfm.tfms)
1905 return -ENOMEM;
1906
ef43aa38
MB		 1907 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1908 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1909 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1910 crypt_free_tfms(cc);
1911 return err;
1912 }
1913
7a1cd723 1914 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 1915 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 1916 return 0;
1917}
1918
1919static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1920{
33d2f09f 1921 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1922 return crypt_alloc_tfms_aead(cc, ciphermode);
1923 else
1924 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1925}
1926
1927static unsigned crypt_subkey_size(struct crypt_config *cc)
1928{
1929 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1930}
1931
1932static unsigned crypt_authenckey_size(struct crypt_config *cc)
1933{
1934 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1935}
1936
1937/*
1938 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1939 * the key must be for some reason in special format.
1940 * This funcion converts cc->key to this special format.
1941 */
1942static void crypt_copy_authenckey(char *p, const void *key,
1943 unsigned enckeylen, unsigned authkeylen)
1944{
1945 struct crypto_authenc_key_param *param;
1946 struct rtattr *rta;
1947
1948 rta = (struct rtattr *)p;
1949 param = RTA_DATA(rta);
1950 param->enckeylen = cpu_to_be32(enckeylen);
1951 rta->rta_len = RTA_LENGTH(sizeof(*param));
1952 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1953 p += RTA_SPACE(sizeof(*param));
1954 memcpy(p, key + enckeylen, authkeylen);
1955 p += authkeylen;
1956 memcpy(p, key, enckeylen);
1957}
1958
671ea6b4 1959static int crypt_setkey(struct crypt_config *cc)
c0297721 1960{
da31a078 1961 unsigned subkey_size;
fd2d231f
MP		 1962 int err = 0, i, r;
1963
da31a078 1964 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1965 subkey_size = crypt_subkey_size(cc);
da31a078 1966
27c70036
MB		 1967 if (crypt_integrity_hmac(cc)) {
1968 if (subkey_size < cc->key_mac_size)
1969 return -EINVAL;
1970
ef43aa38
MB		 1971 crypt_copy_authenckey(cc->authenc_key, cc->key,
1972 subkey_size - cc->key_mac_size,
1973 cc->key_mac_size);
27c70036
MB		 1974 }
1975
fd2d231f 1976 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 1977 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 1978 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1979 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 1980 else if (crypt_integrity_aead(cc))
1981 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1982 cc->key + (i * subkey_size),
1983 subkey_size);
ef43aa38
MB		 1984 else
1985 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
1986 cc->key + (i * subkey_size),
1987 subkey_size);
fd2d231f
MP		 1988 if (r)
1989 err = r;
c0297721
AK		 1990 }
1991
ef43aa38
MB		 1992 if (crypt_integrity_hmac(cc))
1993 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
1994
c0297721
AK		 1995 return err;
1996}
1997
c538f6ec
OK		 1998#ifdef CONFIG_KEYS
1999
027c431c
OK		 2000static bool contains_whitespace(const char *str)
2001{
2002 while (*str)
2003 if (isspace(*str++))
2004 return true;
2005 return false;
2006}
2007
c538f6ec
OK		 2008static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2009{
2010 char *new_key_string, *key_desc;
2011 int ret;
2012 struct key *key;
2013 const struct user_key_payload *ukp;
2014
027c431c
OK		 2015 /*
2016 * Reject key_string with whitespace. dm core currently lacks code for
2017 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2018 */
2019 if (contains_whitespace(key_string)) {
2020 DMERR("whitespace chars not allowed in key string");
2021 return -EINVAL;
2022 }
2023
c538f6ec
OK		 2024 /* look for next ':' separating key_type from key_description */
2025 key_desc = strpbrk(key_string, ":");
2026 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2027 return -EINVAL;
2028
2029 if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
2030 strncmp(key_string, "user:", key_desc - key_string + 1))
2031 return -EINVAL;
2032
2033 new_key_string = kstrdup(key_string, GFP_KERNEL);
2034 if (!new_key_string)
2035 return -ENOMEM;
2036
2037 key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
2e12256b 2038 key_desc + 1, NULL, NULL);
c538f6ec
OK		 2039 if (IS_ERR(key)) {
2040 kzfree(new_key_string);
2041 return PTR_ERR(key);
2042 }
2043
f5b0cba8 2044 down_read(&key->sem);
c538f6ec 2045
0837e49a 2046 ukp = user_key_payload_locked(key);
c538f6ec 2047 if (!ukp) {
f5b0cba8 2048 up_read(&key->sem);
c538f6ec
OK		 2049 key_put(key);
2050 kzfree(new_key_string);
2051 return -EKEYREVOKED;
2052 }
2053
2054 if (cc->key_size != ukp->datalen) {
f5b0cba8 2055 up_read(&key->sem);
c538f6ec
OK		 2056 key_put(key);
2057 kzfree(new_key_string);
2058 return -EINVAL;
2059 }
2060
2061 memcpy(cc->key, ukp->data, cc->key_size);
2062
f5b0cba8 2063 up_read(&key->sem);
c538f6ec
OK		 2064 key_put(key);
2065
2066 /* clear the flag since following operations may invalidate previously valid key */
2067 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2068
2069 ret = crypt_setkey(cc);
2070
c538f6ec
OK		 2071 if (!ret) {
2072 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2073 kzfree(cc->key_string);
2074 cc->key_string = new_key_string;
2075 } else
2076 kzfree(new_key_string);
2077
2078 return ret;
2079}
2080
2081static int get_key_size(char **key_string)
2082{
2083 char *colon, dummy;
2084 int ret;
2085
2086 if (*key_string[0] != ':')
2087 return strlen(*key_string) >> 1;
2088
2089 /* look for next ':' in key string */
2090 colon = strpbrk(*key_string + 1, ":");
2091 if (!colon)
2092 return -EINVAL;
2093
2094 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2095 return -EINVAL;
2096
2097 *key_string = colon;
2098
2099 /* remaining key string should be :<logon|user>:<key_desc> */
2100
2101 return ret;
2102}
2103
2104#else
2105
2106static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2107{
2108 return -EINVAL;
2109}
2110
2111static int get_key_size(char **key_string)
2112{
2113 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2114}
2115
2116#endif
2117
e48d4bbf
MB		 2118static int crypt_set_key(struct crypt_config *cc, char *key)
2119{
de8be5ac
MB		 2120 int r = -EINVAL;
2121 int key_string_len = strlen(key);
2122
69a8cfcd
MB		 2123 /* Hyphen (which gives a key_size of zero) means there is no key. */
2124 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2125 goto out;
e48d4bbf 2126
c538f6ec
OK		 2127 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2128 if (key[0] == ':') {
2129 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2130 goto out;
c538f6ec 2131 }
e48d4bbf 2132
265e9098
OK		 2133 /* clear the flag since following operations may invalidate previously valid key */
2134 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2135
c538f6ec
OK		 2136 /* wipe references to any kernel keyring key */
2137 kzfree(cc->key_string);
2138 cc->key_string = NULL;
2139
e944e03e
AS		 2140 /* Decode key from its hex representation. */
2141 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2142 goto out;
e48d4bbf 2143
671ea6b4 2144 r = crypt_setkey(cc);
265e9098
OK		 2145 if (!r)
2146 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2147
2148out:
2149 /* Hex key string not needed after here, so wipe it. */
2150 memset(key, '0', key_string_len);
2151
2152 return r;
e48d4bbf
MB		 2153}
2154
2155static int crypt_wipe_key(struct crypt_config *cc)
2156{
c82feeec
OK		 2157 int r;
2158
e48d4bbf 2159 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2160 get_random_bytes(&cc->key, cc->key_size);
c538f6ec
OK		 2161 kzfree(cc->key_string);
2162 cc->key_string = NULL;
c82feeec
OK		 2163 r = crypt_setkey(cc);
2164 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2165
c82feeec 2166 return r;
e48d4bbf
MB		 2167}
2168
5059353d
MP		 2169static void crypt_calculate_pages_per_client(void)
2170{
ca79b0c2 2171 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2172
2173 if (!dm_crypt_clients_n)
2174 return;
2175
2176 pages /= dm_crypt_clients_n;
2177 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2178 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2179 dm_crypt_pages_per_client = pages;
2180}
2181
2182static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2183{
2184 struct crypt_config *cc = pool_data;
2185 struct page *page;
2186
2187 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2188 likely(gfp_mask & __GFP_NORETRY))
2189 return NULL;
2190
2191 page = alloc_page(gfp_mask);
2192 if (likely(page != NULL))
2193 percpu_counter_add(&cc->n_allocated_pages, 1);
2194
2195 return page;
2196}
2197
2198static void crypt_page_free(void *page, void *pool_data)
2199{
2200 struct crypt_config *cc = pool_data;
2201
2202 __free_page(page);
2203 percpu_counter_sub(&cc->n_allocated_pages, 1);
2204}
2205
28513fcc
MB		 2206static void crypt_dtr(struct dm_target *ti)
2207{
2208 struct crypt_config *cc = ti->private;
2209
2210 ti->private = NULL;
2211
2212 if (!cc)
2213 return;
2214
f659b100 2215 if (cc->write_thread)
dc267621
MP		 2216 kthread_stop(cc->write_thread);
2217
28513fcc
MB		 2218 if (cc->io_queue)
2219 destroy_workqueue(cc->io_queue);
2220 if (cc->crypt_queue)
2221 destroy_workqueue(cc->crypt_queue);
2222
fd2d231f
MP		 2223 crypt_free_tfms(cc);
2224
6f1c819c 2225 bioset_exit(&cc->bs);
28513fcc 2226
6f1c819c
KO		 2227 mempool_exit(&cc->page_pool);
2228 mempool_exit(&cc->req_pool);
2229 mempool_exit(&cc->tag_pool);
2230
d00a11df
KO		 2231 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2232 percpu_counter_destroy(&cc->n_allocated_pages);
2233
28513fcc
MB		 2234 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2235 cc->iv_gen_ops->dtr(cc);
2236
28513fcc
MB		 2237 if (cc->dev)
2238 dm_put_device(ti, cc->dev);
2239
5ebaee6d 2240 kzfree(cc->cipher);
7dbcd137 2241 kzfree(cc->cipher_string);
c538f6ec 2242 kzfree(cc->key_string);
ef43aa38
MB		 2243 kzfree(cc->cipher_auth);
2244 kzfree(cc->authenc_key);
28513fcc 2245
d5ffebdd
MS		 2246 mutex_destroy(&cc->bio_alloc_lock);
2247
28513fcc
MB		 2248 /* Must zero key material before freeing */
2249 kzfree(cc);
5059353d
MP		 2250
2251 spin_lock(&dm_crypt_clients_lock);
2252 WARN_ON(!dm_crypt_clients_n);
2253 dm_crypt_clients_n--;
2254 crypt_calculate_pages_per_client();
2255 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2256}
2257
e889f97a
MB		 2258static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2259{
2260 struct crypt_config *cc = ti->private;
2261
33d2f09f 2262 if (crypt_integrity_aead(cc))
e889f97a
MB		 2263 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2264 else
2265 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2266
e889f97a
MB		 2267 if (cc->iv_size)
2268 /* at least a 64 bit sector number should fit in our buffer */
2269 cc->iv_size = max(cc->iv_size,
2270 (unsigned int)(sizeof(u64) / sizeof(u8)));
2271 else if (ivmode) {
2272 DMWARN("Selected cipher does not support IVs");
2273 ivmode = NULL;
2274 }
2275
2276 /* Choose ivmode, see comments at iv code. */
2277 if (ivmode == NULL)
2278 cc->iv_gen_ops = NULL;
2279 else if (strcmp(ivmode, "plain") == 0)
2280 cc->iv_gen_ops = &crypt_iv_plain_ops;
2281 else if (strcmp(ivmode, "plain64") == 0)
2282 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2283 else if (strcmp(ivmode, "plain64be") == 0)
2284 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2285 else if (strcmp(ivmode, "essiv") == 0)
2286 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2287 else if (strcmp(ivmode, "benbi") == 0)
2288 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2289 else if (strcmp(ivmode, "null") == 0)
2290 cc->iv_gen_ops = &crypt_iv_null_ops;
2291 else if (strcmp(ivmode, "lmk") == 0) {
2292 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2293 /*
2294 * Version 2 and 3 is recognised according
2295 * to length of provided multi-key string.
2296 * If present (version 3), last key is used as IV seed.
2297 * All keys (including IV seed) are always the same size.
2298 */
2299 if (cc->key_size % cc->key_parts) {
2300 cc->key_parts++;
2301 cc->key_extra_size = cc->key_size / cc->key_parts;
2302 }
2303 } else if (strcmp(ivmode, "tcw") == 0) {
2304 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2305 cc->key_parts += 2; /* IV + whitening */
2306 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2307 } else if (strcmp(ivmode, "random") == 0) {
2308 cc->iv_gen_ops = &crypt_iv_random_ops;
2309 /* Need storage space in integrity fields. */
2310 cc->integrity_iv_size = cc->iv_size;
2311 } else {
2312 ti->error = "Invalid IV mode";
2313 return -EINVAL;
2314 }
2315
2316 return 0;
2317}
2318
33d2f09f
MB		 2319/*
2320 * Workaround to parse cipher algorithm from crypto API spec.
2321 * The cc->cipher is currently used only in ESSIV.
2322 * This should be probably done by crypto-api calls (once available...)
2323 */
2324static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2325{
2326 const char *alg_name = NULL;
2327 char *start, *end;
2328
2329 if (crypt_integrity_aead(cc)) {
2330 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2331 if (!alg_name)
2332 return -EINVAL;
2333 if (crypt_integrity_hmac(cc)) {
2334 alg_name = strchr(alg_name, ',');
2335 if (!alg_name)
2336 return -EINVAL;
2337 }
2338 alg_name++;
2339 } else {
2340 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2341 if (!alg_name)
2342 return -EINVAL;
2343 }
2344
2345 start = strchr(alg_name, '(');
2346 end = strchr(alg_name, ')');
2347
2348 if (!start && !end) {
2349 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2350 return cc->cipher ? 0 : -ENOMEM;
2351 }
2352
2353 if (!start || !end || ++start >= end)
2354 return -EINVAL;
2355
2356 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2357 if (!cc->cipher)
2358 return -ENOMEM;
2359
2360 strncpy(cc->cipher, start, end - start);
2361
2362 return 0;
2363}
2364
2365/*
2366 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2367 * The HMAC is needed to calculate tag size (HMAC digest size).
2368 * This should be probably done by crypto-api calls (once available...)
2369 */
2370static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2371{
2372 char *start, *end, *mac_alg = NULL;
2373 struct crypto_ahash *mac;
2374
2375 if (!strstarts(cipher_api, "authenc("))
2376 return 0;
2377
2378 start = strchr(cipher_api, '(');
2379 end = strchr(cipher_api, ',');
2380 if (!start || !end || ++start > end)
2381 return -EINVAL;
2382
2383 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2384 if (!mac_alg)
2385 return -ENOMEM;
2386 strncpy(mac_alg, start, end - start);
2387
2388 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2389 kfree(mac_alg);
2390
2391 if (IS_ERR(mac))
2392 return PTR_ERR(mac);
2393
2394 cc->key_mac_size = crypto_ahash_digestsize(mac);
2395 crypto_free_ahash(mac);
2396
2397 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2398 if (!cc->authenc_key)
2399 return -ENOMEM;
2400
2401 return 0;
2402}
2403
2404static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2405 char **ivmode, char **ivopts)
2406{
2407 struct crypt_config *cc = ti->private;
2408 char *tmp, *cipher_api;
2409 int ret = -EINVAL;
2410
2411 cc->tfms_count = 1;
2412
2413 /*
2414 * New format (capi: prefix)
2415 * capi:cipher_api_spec-iv:ivopts
2416 */
2417 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2418
2419 /* Separate IV options if present, it can contain another '-' in hash name */
2420 *ivopts = strrchr(tmp, ':');
2421 if (*ivopts) {
2422 **ivopts = '\0';
2423 (*ivopts)++;
2424 }
2425 /* Parse IV mode */
2426 *ivmode = strrchr(tmp, '-');
2427 if (*ivmode) {
2428 **ivmode = '\0';
2429 (*ivmode)++;
2430 }
2431 /* The rest is crypto API spec */
2432 cipher_api = tmp;
33d2f09f
MB		 2433
2434 if (*ivmode && !strcmp(*ivmode, "lmk"))
2435 cc->tfms_count = 64;
2436
2437 cc->key_parts = cc->tfms_count;
2438
2439 /* Allocate cipher */
2440 ret = crypt_alloc_tfms(cc, cipher_api);
2441 if (ret < 0) {
2442 ti->error = "Error allocating crypto tfm";
2443 return ret;
2444 }
2445
2446 /* Alloc AEAD, can be used only in new format. */
2447 if (crypt_integrity_aead(cc)) {
2448 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2449 if (ret < 0) {
2450 ti->error = "Invalid AEAD cipher spec";
2451 return -ENOMEM;
2452 }
2453 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2454 } else
2455 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2456
2457 ret = crypt_ctr_blkdev_cipher(cc);
2458 if (ret < 0) {
2459 ti->error = "Cannot allocate cipher string";
2460 return -ENOMEM;
2461 }
2462
2463 return 0;
2464}
2465
2466static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2467 char **ivmode, char **ivopts)
1da177e4 2468{
5ebaee6d 2469 struct crypt_config *cc = ti->private;
33d2f09f 2470 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2471 char *cipher_api = NULL;
fd2d231f 2472 int ret = -EINVAL;
31998ef1 2473 char dummy;
1da177e4 2474
33d2f09f 2475 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2476 ti->error = "Bad cipher specification";
1da177e4
LT		 2477 return -EINVAL;
2478 }
2479
5ebaee6d
MB		 2480 /*
2481 * Legacy dm-crypt cipher specification
d1f96423 2482 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2483 */
2484 tmp = cipher_in;
d1f96423
MB		 2485 keycount = strsep(&tmp, "-");
2486 cipher = strsep(&keycount, ":");
2487
2488 if (!keycount)
2489 cc->tfms_count = 1;
31998ef1 2490 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2491 !is_power_of_2(cc->tfms_count)) {
2492 ti->error = "Bad cipher key count specification";
2493 return -EINVAL;
2494 }
2495 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2496
2497 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2498 if (!cc->cipher)
2499 goto bad_mem;
2500
1da177e4 2501 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 2502 *ivmode = strsep(&tmp, ":");
2503 *ivopts = tmp;
1da177e4 2504
7dbcd137
MB		 2505 /*
2506 * For compatibility with the original dm-crypt mapping format, if
2507 * only the cipher name is supplied, use cbc-plain.
2508 */
33d2f09f 2509 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2510 chainmode = "cbc";
33d2f09f 2511 *ivmode = "plain";
1da177e4
LT		 2512 }
2513
33d2f09f 2514 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2515 ti->error = "IV mechanism required";
2516 return -EINVAL;
1da177e4
LT		 2517 }
2518
5ebaee6d
MB		 2519 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2520 if (!cipher_api)
2521 goto bad_mem;
2522
2523 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2524 "%s(%s)", chainmode, cipher);
2525 if (ret < 0) {
2526 kfree(cipher_api);
2527 goto bad_mem;
1da177e4
LT		 2528 }
2529
5ebaee6d 2530 /* Allocate cipher */
fd2d231f
MP		 2531 ret = crypt_alloc_tfms(cc, cipher_api);
2532 if (ret < 0) {
2533 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2534 kfree(cipher_api);
2535 return ret;
1da177e4 2536 }
bd86e320 2537 kfree(cipher_api);
1da177e4 2538
33d2f09f
MB		 2539 return 0;
2540bad_mem:
2541 ti->error = "Cannot allocate cipher strings";
2542 return -ENOMEM;
2543}
5ebaee6d 2544
33d2f09f
MB		 2545static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2546{
2547 struct crypt_config *cc = ti->private;
2548 char *ivmode = NULL, *ivopts = NULL;
2549 int ret;
2550
2551 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2552 if (!cc->cipher_string) {
2553 ti->error = "Cannot allocate cipher strings";
2554 return -ENOMEM;
1da177e4
LT		 2555 }
2556
33d2f09f
MB		 2557 if (strstarts(cipher_in, "capi:"))
2558 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2559 else
2560 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2561 if (ret)
2562 return ret;
2563
5ebaee6d 2564 /* Initialize IV */
e889f97a
MB		 2565 ret = crypt_ctr_ivmode(ti, ivmode);
2566 if (ret < 0)
33d2f09f 2567 return ret;
1da177e4 2568
da31a078
MB		 2569 /* Initialize and set key */
2570 ret = crypt_set_key(cc, key);
2571 if (ret < 0) {
2572 ti->error = "Error decoding and setting key";
33d2f09f 2573 return ret;
da31a078
MB		 2574 }
2575
28513fcc
MB		 2576 /* Allocate IV */
2577 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2578 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2579 if (ret < 0) {
2580 ti->error = "Error creating IV";
33d2f09f 2581 return ret;
28513fcc
MB		 2582 }
2583 }
1da177e4 2584
28513fcc
MB		 2585 /* Initialize IV (set keys for ESSIV etc) */
2586 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2587 ret = cc->iv_gen_ops->init(cc);
2588 if (ret < 0) {
2589 ti->error = "Error initialising IV";
33d2f09f 2590 return ret;
28513fcc 2591 }
b95bf2d3
MB		 2592 }
2593
dc94902b
OK		 2594 /* wipe the kernel key payload copy */
2595 if (cc->key_string)
2596 memset(cc->key, 0, cc->key_size * sizeof(u8));
2597
5ebaee6d 2598 return ret;
5ebaee6d 2599}
5ebaee6d 2600
ef43aa38
MB		 2601static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2602{
2603 struct crypt_config *cc = ti->private;
2604 struct dm_arg_set as;
5916a22b 2605 static const struct dm_arg _args[] = {
8f0009a2 2606 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2607 };
2608 unsigned int opt_params, val;
2609 const char *opt_string, *sval;
8f0009a2 2610 char dummy;
ef43aa38
MB		 2611 int ret;
2612
2613 /* Optional parameters */
2614 as.argc = argc;
2615 as.argv = argv;
2616
2617 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2618 if (ret)
2619 return ret;
2620
2621 while (opt_params--) {
2622 opt_string = dm_shift_arg(&as);
2623 if (!opt_string) {
2624 ti->error = "Not enough feature arguments";
2625 return -EINVAL;
2626 }
2627
2628 if (!strcasecmp(opt_string, "allow_discards"))
2629 ti->num_discard_bios = 1;
2630
2631 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2632 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2633
2634 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2635 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2636 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2637 if (val == 0 || val > MAX_TAG_SIZE) {
2638 ti->error = "Invalid integrity arguments";
2639 return -EINVAL;
2640 }
2641 cc->on_disk_tag_size = val;
2642 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2643 if (!strcasecmp(sval, "aead")) {
2644 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2645 } else if (strcasecmp(sval, "none")) {
2646 ti->error = "Unknown integrity profile";
2647 return -EINVAL;
2648 }
2649
2650 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2651 if (!cc->cipher_auth)
2652 return -ENOMEM;
ff3af92b 2653 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2654 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2655 cc->sector_size > 4096 ||
ff3af92b 2656 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2657 ti->error = "Invalid feature value for sector_size";
2658 return -EINVAL;
2659 }
783874b0
MB		 2660 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
2661 ti->error = "Device size is not multiple of sector_size feature";
2662 return -EINVAL;
2663 }
ff3af92b 2664 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2665 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2666 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2667 else {
ef43aa38
MB		 2668 ti->error = "Invalid feature arguments";
2669 return -EINVAL;
2670 }
2671 }
2672
2673 return 0;
5ebaee6d
MB		 2674}
2675
2676/*
2677 * Construct an encryption mapping:
c538f6ec 2678 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2679 */
2680static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2681{
2682 struct crypt_config *cc;
ed0302e8 2683 const char *devname = dm_table_device_name(ti->table);
c538f6ec 2684 int key_size;
ef43aa38 2685 unsigned int align_mask;
5ebaee6d
MB		 2686 unsigned long long tmpll;
2687 int ret;
ef43aa38 2688 size_t iv_size_padding, additional_req_size;
31998ef1 2689 char dummy;
772ae5f5 2690
772ae5f5 2691 if (argc < 5) {
5ebaee6d
MB		 2692 ti->error = "Not enough arguments";
2693 return -EINVAL;
1da177e4
LT		 2694 }
2695
c538f6ec
OK		 2696 key_size = get_key_size(&argv[1]);
2697 if (key_size < 0) {
2698 ti->error = "Cannot parse key size";
2699 return -EINVAL;
2700 }
5ebaee6d
MB		 2701
2702 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2703 if (!cc) {
2704 ti->error = "Cannot allocate encryption context";
2705 return -ENOMEM;
2706 }
69a8cfcd 2707 cc->key_size = key_size;
8f0009a2 2708 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2709 cc->sector_shift = 0;
5ebaee6d
MB		 2710
2711 ti->private = cc;
ef43aa38 2712
5059353d
MP		 2713 spin_lock(&dm_crypt_clients_lock);
2714 dm_crypt_clients_n++;
2715 crypt_calculate_pages_per_client();
2716 spin_unlock(&dm_crypt_clients_lock);
2717
2718 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
2719 if (ret < 0)
2720 goto bad;
2721
ef43aa38
MB		 2722 /* Optional parameters need to be read before cipher constructor */
2723 if (argc > 5) {
2724 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2725 if (ret)
2726 goto bad;
2727 }
2728
5ebaee6d
MB		 2729 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2730 if (ret < 0)
2731 goto bad;
2732
33d2f09f 2733 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2734 cc->dmreq_start = sizeof(struct aead_request);
2735 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2736 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2737 } else {
2738 cc->dmreq_start = sizeof(struct skcipher_request);
2739 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2740 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2741 }
d49ec52f
MP		 2742 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2743
ef43aa38 2744 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2745 /* Allocate the padding exactly */
2746 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2747 & align_mask;
d49ec52f
MP		 2748 } else {
2749 /*
2750 * If the cipher requires greater alignment than kmalloc
2751 * alignment, we don't know the exact position of the
2752 * initialization vector. We must assume worst case.
2753 */
ef43aa38 2754 iv_size_padding = align_mask;
d49ec52f 2755 }
ddd42edf 2756
ef43aa38
MB		 2757 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2758 additional_req_size = sizeof(struct dm_crypt_request) +
2759 iv_size_padding + cc->iv_size +
2760 cc->iv_size +
2761 sizeof(uint64_t) +
2762 sizeof(unsigned int);
2763
6f1c819c
KO		 2764 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
2765 if (ret) {
ddd42edf 2766 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2767 goto bad;
ddd42edf 2768 }
ddd42edf 2769
30187e1d 2770 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2771 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2772 ARCH_KMALLOC_MINALIGN);
298a9fa0 2773
6f1c819c
KO		 2774 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
2775 if (ret) {
72d94861 2776 ti->error = "Cannot allocate page mempool";
28513fcc 2777 goto bad;
1da177e4
LT		 2778 }
2779
6f1c819c
KO		 2780 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
2781 if (ret) {
6a24c718 2782 ti->error = "Cannot allocate crypt bioset";
28513fcc 2783 goto bad;
6a24c718
MB		 2784 }
2785
7145c241
MP		 2786 mutex_init(&cc->bio_alloc_lock);
2787
28513fcc 2788 ret = -EINVAL;
8f0009a2
MB		 2789 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2790 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2791 ti->error = "Invalid iv_offset sector";
28513fcc 2792 goto bad;
1da177e4 2793 }
4ee218cd 2794 cc->iv_offset = tmpll;
1da177e4 2795
e80d1c80
VG		 2796 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2797 if (ret) {
28513fcc
MB		 2798 ti->error = "Device lookup failed";
2799 goto bad;
2800 }
2801
e80d1c80 2802 ret = -EINVAL;
ef87bfc2 2803 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 2804 ti->error = "Invalid device sector";
28513fcc 2805 goto bad;
1da177e4 2806 }
4ee218cd 2807 cc->start = tmpll;
1da177e4 2808
33d2f09f 2809 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2810 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2811 if (ret)
2812 goto bad;
2813
ef43aa38
MB		 2814 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2815 if (!cc->tag_pool_max_sectors)
2816 cc->tag_pool_max_sectors = 1;
f3396c58 2817
6f1c819c 2818 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 2819 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 2820 if (ret) {
ef43aa38
MB		 2821 ti->error = "Cannot allocate integrity tags mempool";
2822 goto bad;
772ae5f5 2823 }
583fe747
MP		 2824
2825 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 2826 }
2827
28513fcc 2828 ret = -ENOMEM;
ed0302e8
MM		 2829 cc->io_queue = alloc_workqueue("kcryptd_io/%s",
2830 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
2831 1, devname);
cabf08e4
MB		 2832 if (!cc->io_queue) {
2833 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2834 goto bad;
cabf08e4
MB		 2835 }
2836
f3396c58 2837 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
ed0302e8
MM		 2838 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
2839 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
2840 1, devname);
f3396c58 2841 else
ed0302e8 2842 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
a1b89132 2843 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 2844 num_online_cpus(), devname);
cabf08e4 2845 if (!cc->crypt_queue) {
9934a8be 2846 ti->error = "Couldn't create kcryptd queue";
28513fcc 2847 goto bad;
9934a8be
MB		 2848 }
2849
c7329eff 2850 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 2851 cc->write_tree = RB_ROOT;
dc267621 2852
ed0302e8 2853 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 2854 if (IS_ERR(cc->write_thread)) {
2855 ret = PTR_ERR(cc->write_thread);
2856 cc->write_thread = NULL;
2857 ti->error = "Couldn't spawn write thread";
2858 goto bad;
2859 }
2860 wake_up_process(cc->write_thread);
2861
55a62eef 2862 ti->num_flush_bios = 1;
983c7db3 2863
1da177e4
LT		 2864 return 0;
2865
28513fcc
MB		 2866bad:
2867 crypt_dtr(ti);
2868 return ret;
1da177e4
LT		 2869}
2870
7de3ee57 2871static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2872{
028867ac 2873 struct dm_crypt_io *io;
49a8a920 2874 struct crypt_config *cc = ti->private;
647c7db1 2875
772ae5f5 2876 /*
28a8f0d3
MC		 2877 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2878 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2879 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2880 */
1eff9d32 2881 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2882 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 2883 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 2884 if (bio_sectors(bio))
4f024f37
KO		 2885 bio->bi_iter.bi_sector = cc->start +
2886 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2887 return DM_MAPIO_REMAPPED;
2888 }
1da177e4 2889
4e870e94
MP		 2890 /*
2891 * Check if bio is too large, split as needed.
2892 */
2893 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2894 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2895 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2896
8f0009a2
MB		 2897 /*
2898 * Ensure that bio is a multiple of internal sector encryption size
2899 * and is aligned to this size as defined in IO hints.
2900 */
2901 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 2902 return DM_MAPIO_KILL;
8f0009a2
MB		 2903
2904 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 2905 return DM_MAPIO_KILL;
8f0009a2 2906
298a9fa0
MP		 2907 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2908 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2909
2910 if (cc->on_disk_tag_size) {
583fe747 2911 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 2912
2913 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 2914 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 2915 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2916 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2917 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 2918 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 2919 io->integrity_metadata_from_pool = true;
2920 }
2921 }
2922
33d2f09f 2923 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2924 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2925 else
2926 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2927
20c82538
MB		 2928 if (bio_data_dir(io->base_bio) == READ) {
2929 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2930 kcryptd_queue_read(io);
20c82538 2931 } else
cabf08e4 2932 kcryptd_queue_crypt(io);
1da177e4 2933
d2a7ad29 2934 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2935}
2936
fd7c092e
MP		 2937static void crypt_status(struct dm_target *ti, status_type_t type,
2938 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2939{
5ebaee6d 2940 struct crypt_config *cc = ti->private;
fd7c092e 2941 unsigned i, sz = 0;
f3396c58 2942 int num_feature_args = 0;
1da177e4
LT		 2943
2944 switch (type) {
2945 case STATUSTYPE_INFO:
2946 result[0] = '\0';
2947 break;
2948
2949 case STATUSTYPE_TABLE:
7dbcd137 2950 DMEMIT("%s ", cc->cipher_string);
1da177e4 2951
c538f6ec
OK		 2952 if (cc->key_size > 0) {
2953 if (cc->key_string)
2954 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2955 else
2956 for (i = 0; i < cc->key_size; i++)
2957 DMEMIT("%02x", cc->key[i]);
2958 } else
fd7c092e 2959 DMEMIT("-");
1da177e4 2960
4ee218cd
AM		 2961 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2962 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2963
f3396c58
MP		 2964 num_feature_args += !!ti->num_discard_bios;
2965 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2966 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2967 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2968 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2969 if (cc->on_disk_tag_size)
2970 num_feature_args++;
f3396c58
MP		 2971 if (num_feature_args) {
2972 DMEMIT(" %d", num_feature_args);
2973 if (ti->num_discard_bios)
2974 DMEMIT(" allow_discards");
2975 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2976 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2977 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2978 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2979 if (cc->on_disk_tag_size)
2980 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2981 if (cc->sector_size != (1 << SECTOR_SHIFT))
2982 DMEMIT(" sector_size:%d", cc->sector_size);
2983 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2984 DMEMIT(" iv_large_sectors");
f3396c58 2985 }
772ae5f5 2986
1da177e4
LT		 2987 break;
2988 }
1da177e4
LT		 2989}
2990
e48d4bbf
MB		 2991static void crypt_postsuspend(struct dm_target *ti)
2992{
2993 struct crypt_config *cc = ti->private;
2994
2995 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2996}
2997
2998static int crypt_preresume(struct dm_target *ti)
2999{
3000 struct crypt_config *cc = ti->private;
3001
3002 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3003 DMERR("aborting resume - crypt key is not set.");
3004 return -EAGAIN;
3005 }
3006
3007 return 0;
3008}
3009
3010static void crypt_resume(struct dm_target *ti)
3011{
3012 struct crypt_config *cc = ti->private;
3013
3014 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3015}
3016
3017/* Message interface
3018 * key set <key>
3019 * key wipe
3020 */
1eb5fa84
MS		 3021static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3022 char *result, unsigned maxlen)
e48d4bbf
MB		 3023{
3024 struct crypt_config *cc = ti->private;
c538f6ec 3025 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3026
3027 if (argc < 2)
3028 goto error;
3029
498f0103 3030 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3031 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3032 DMWARN("not suspended during key manipulation.");
3033 return -EINVAL;
3034 }
498f0103 3035 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3036 /* The key size may not be changed. */
3037 key_size = get_key_size(&argv[2]);
3038 if (key_size < 0 || cc->key_size != key_size) {
3039 memset(argv[2], '0', strlen(argv[2]));
3040 return -EINVAL;
3041 }
3042
542da317
MB		 3043 ret = crypt_set_key(cc, argv[2]);
3044 if (ret)
3045 return ret;
3046 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3047 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3048 /* wipe the kernel key payload copy */
3049 if (cc->key_string)
3050 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3051 return ret;
3052 }
498f0103 3053 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 3054 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
3055 ret = cc->iv_gen_ops->wipe(cc);
3056 if (ret)
3057 return ret;
3058 }
e48d4bbf 3059 return crypt_wipe_key(cc);
542da317 3060 }
e48d4bbf
MB		 3061 }
3062
3063error:
3064 DMWARN("unrecognised message received.");
3065 return -EINVAL;
3066}
3067
af4874e0
MS		 3068static int crypt_iterate_devices(struct dm_target *ti,
3069 iterate_devices_callout_fn fn, void *data)
3070{
3071 struct crypt_config *cc = ti->private;
3072
5dea271b 3073 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3074}
3075
586b286b
MS		 3076static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3077{
8f0009a2
MB		 3078 struct crypt_config *cc = ti->private;
3079
586b286b
MS		 3080 /*
3081 * Unfortunate constraint that is required to avoid the potential
3082 * for exceeding underlying device's max_segments limits -- due to
3083 * crypt_alloc_buffer() possibly allocating pages for the encryption
3084 * bio that are not as physically contiguous as the original bio.
3085 */
3086 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3087
bc9e9cf0
MP		 3088 limits->logical_block_size =
3089 max_t(unsigned short, limits->logical_block_size, cc->sector_size);
3090 limits->physical_block_size =
3091 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3092 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3093}
3094
1da177e4
LT		 3095static struct target_type crypt_target = {
3096 .name = "crypt",
dc94902b 3097 .version = {1, 18, 1},
1da177e4
LT		 3098 .module = THIS_MODULE,
3099 .ctr = crypt_ctr,
3100 .dtr = crypt_dtr,
3101 .map = crypt_map,
3102 .status = crypt_status,
e48d4bbf
MB		 3103 .postsuspend = crypt_postsuspend,
3104 .preresume = crypt_preresume,
3105 .resume = crypt_resume,
3106 .message = crypt_message,
af4874e0 3107 .iterate_devices = crypt_iterate_devices,
586b286b 3108 .io_hints = crypt_io_hints,
1da177e4
LT		 3109};
3110
3111static int __init dm_crypt_init(void)
3112{
3113 int r;
3114
1da177e4 3115 r = dm_register_target(&crypt_target);
94f5e024 3116 if (r < 0)
72d94861 3117 DMERR("register failed %d", r);
1da177e4 3118
1da177e4
LT		 3119 return r;
3120}
3121
3122static void __exit dm_crypt_exit(void)
3123{
10d3bd09 3124 dm_unregister_target(&crypt_target);
1da177e4
LT		 3125}
3126
3127module_init(dm_crypt_init);
3128module_exit(dm_crypt_exit);
3129
bf14299f 3130MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3131MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3132MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)