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dm integrity: support larger block sizes
[linux-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;
c66029f4 52 sector_t cc_sector;
40b6229b 53 atomic_t cc_pending;
ef43aa38
MB		 54 union {
55 struct skcipher_request *req;
56 struct aead_request *req_aead;
57 } r;
58
1da177e4
LT		 59};
60
53017030
MB		 61/*
62 * per bio private data
63 */
64struct dm_crypt_io {
49a8a920 65 struct crypt_config *cc;
53017030 66 struct bio *base_bio;
ef43aa38
MB		 67 u8 *integrity_metadata;
68 bool integrity_metadata_from_pool;
53017030
MB		 69 struct work_struct work;
70
71 struct convert_context ctx;
72
40b6229b 73 atomic_t io_pending;
53017030 74 int error;
0c395b0f 75 sector_t sector;
dc267621 76
b3c5fd30 77 struct rb_node rb_node;
298a9fa0 78} CRYPTO_MINALIGN_ATTR;
53017030 79
01482b76 80struct dm_crypt_request {
b2174eeb 81 struct convert_context *ctx;
ef43aa38
MB		 82 struct scatterlist sg_in[4];
83 struct scatterlist sg_out[4];
2dc5327d 84 sector_t iv_sector;
01482b76
MB		 85};
86
1da177e4
LT		 87struct crypt_config;
88
89struct crypt_iv_operations {
90 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 91 const char *opts);
1da177e4 92 void (*dtr)(struct crypt_config *cc);
b95bf2d3 93 int (*init)(struct crypt_config *cc);
542da317 94 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 95 int (*generator)(struct crypt_config *cc, u8 *iv,
96 struct dm_crypt_request *dmreq);
97 int (*post)(struct crypt_config *cc, u8 *iv,
98 struct dm_crypt_request *dmreq);
1da177e4
LT		 99};
100
60473592 101struct iv_essiv_private {
bbdb23b5 102 struct crypto_ahash *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
142 /*
ef43aa38
MB		 143 * pool for per bio private data, crypto requests,
144 * encryption requeusts/buffer pages and integrity tags
1da177e4 145 */
ddd42edf 146 mempool_t *req_pool;
1da177e4 147 mempool_t *page_pool;
ef43aa38
MB		 148 mempool_t *tag_pool;
149 unsigned tag_pool_max_sectors;
150
6a24c718 151 struct bio_set *bs;
7145c241 152 struct mutex bio_alloc_lock;
1da177e4 153
cabf08e4
MB		 154 struct workqueue_struct *io_queue;
155 struct workqueue_struct *crypt_queue;
3f1e9070 156
dc267621
MP		 157 struct task_struct *write_thread;
158 wait_queue_head_t write_thread_wait;
b3c5fd30 159 struct rb_root write_tree;
dc267621 160
5ebaee6d 161 char *cipher;
7dbcd137 162 char *cipher_string;
ef43aa38 163 char *cipher_auth;
c538f6ec 164 char *key_string;
5ebaee6d 165
1b1b58f5 166 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 167 union {
60473592
MB		 168 struct iv_essiv_private essiv;
169 struct iv_benbi_private benbi;
34745785 170 struct iv_lmk_private lmk;
ed04d981 171 struct iv_tcw_private tcw;
79066ad3 172 } iv_gen_private;
1da177e4
LT		 173 sector_t iv_offset;
174 unsigned int iv_size;
ff3af92b
MP		 175 unsigned short int sector_size;
176 unsigned char sector_shift;
1da177e4 177
fd2d231f
MP		 178 /* ESSIV: struct crypto_cipher *essiv_tfm */
179 void *iv_private;
ef43aa38
MB		 180 union {
181 struct crypto_skcipher **tfms;
182 struct crypto_aead **tfms_aead;
183 } cipher_tfm;
d1f96423 184 unsigned tfms_count;
ef43aa38 185 unsigned long cipher_flags;
c0297721 186
ddd42edf
MB		 187 /*
188 * Layout of each crypto request:
189 *
bbdb23b5 190 * struct skcipher_request
ddd42edf
MB		 191 * context
192 * padding
193 * struct dm_crypt_request
194 * padding
195 * IV
196 *
197 * The padding is added so that dm_crypt_request and the IV are
198 * correctly aligned.
199 */
200 unsigned int dmreq_start;
ddd42edf 201
298a9fa0
MP		 202 unsigned int per_bio_data_size;
203
e48d4bbf 204 unsigned long flags;
1da177e4 205 unsigned int key_size;
da31a078
MB		 206 unsigned int key_parts; /* independent parts in key buffer */
207 unsigned int key_extra_size; /* additional keys length */
ef43aa38
MB		 208 unsigned int key_mac_size; /* MAC key size for authenc(...) */
209
210 unsigned int integrity_tag_size;
211 unsigned int integrity_iv_size;
212 unsigned int on_disk_tag_size;
213
214 u8 *authenc_key; /* space for keys in authenc() format (if used) */
1da177e4
LT		 215 u8 key[0];
216};
217
ef43aa38
MB		 218#define MIN_IOS 64
219#define MAX_TAG_SIZE 480
220#define POOL_ENTRY_SIZE 512
1da177e4 221
028867ac 222static void clone_init(struct dm_crypt_io *, struct bio *);
395b167c 223static void kcryptd_queue_crypt(struct dm_crypt_io *io);
ef43aa38
MB		 224static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
225 struct scatterlist *sg);
027581f3 226
c0297721
AK		 227/*
228 * Use this to access cipher attributes that are the same for each CPU.
229 */
bbdb23b5 230static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 231{
ef43aa38
MB		 232 return cc->cipher_tfm.tfms[0];
233}
234
235static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
236{
237 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 238}
239
1da177e4
LT		 240/*
241 * Different IV generation algorithms:
242 *
3c164bd8 243 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 244 * number, padded with zeros if necessary.
1da177e4 245 *
61afef61
MB		 246 * plain64: the initial vector is the 64-bit little-endian version of the sector
247 * number, padded with zeros if necessary.
248 *
3c164bd8
RS		 249 * essiv: "encrypted sector|salt initial vector", the sector number is
250 * encrypted with the bulk cipher using a salt as key. The salt
251 * should be derived from the bulk cipher's key via hashing.
1da177e4 252 *
48527fa7
RS		 253 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
254 * (needed for LRW-32-AES and possible other narrow block modes)
255 *
46b47730
LN		 256 * null: the initial vector is always zero. Provides compatibility with
257 * obsolete loop_fish2 devices. Do not use for new devices.
258 *
34745785
MB		 259 * lmk: Compatible implementation of the block chaining mode used
260 * by the Loop-AES block device encryption system
261 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
262 * It operates on full 512 byte sectors and uses CBC
263 * with an IV derived from the sector number, the data and
264 * optionally extra IV seed.
265 * This means that after decryption the first block
266 * of sector must be tweaked according to decrypted data.
267 * Loop-AES can use three encryption schemes:
268 * version 1: is plain aes-cbc mode
269 * version 2: uses 64 multikey scheme with lmk IV generator
270 * version 3: the same as version 2 with additional IV seed
271 * (it uses 65 keys, last key is used as IV seed)
272 *
ed04d981
MB		 273 * tcw: Compatible implementation of the block chaining mode used
274 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 275 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 276 * It operates on full 512 byte sectors and uses CBC
277 * with an IV derived from initial key and the sector number.
278 * In addition, whitening value is applied on every sector, whitening
279 * is calculated from initial key, sector number and mixed using CRC32.
280 * Note that this encryption scheme is vulnerable to watermarking attacks
281 * and should be used for old compatible containers access only.
282 *
1da177e4
LT		 283 * plumb: unimplemented, see:
284 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
285 */
286
2dc5327d
MB		 287static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
288 struct dm_crypt_request *dmreq)
1da177e4
LT		 289{
290 memset(iv, 0, cc->iv_size);
283a8328 291 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 292
293 return 0;
294}
295
61afef61 296static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 297 struct dm_crypt_request *dmreq)
61afef61
MB		 298{
299 memset(iv, 0, cc->iv_size);
283a8328 300 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 301
302 return 0;
303}
304
b95bf2d3
MB		 305/* Initialise ESSIV - compute salt but no local memory allocations */
306static int crypt_iv_essiv_init(struct crypt_config *cc)
307{
308 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 309 AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm);
b95bf2d3 310 struct scatterlist sg;
c0297721 311 struct crypto_cipher *essiv_tfm;
fd2d231f 312 int err;
b95bf2d3
MB		 313
314 sg_init_one(&sg, cc->key, cc->key_size);
bbdb23b5
HX		 315 ahash_request_set_tfm(req, essiv->hash_tfm);
316 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
317 ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size);
b95bf2d3 318
bbdb23b5
HX		 319 err = crypto_ahash_digest(req);
320 ahash_request_zero(req);
b95bf2d3
MB		 321 if (err)
322 return err;
323
fd2d231f 324 essiv_tfm = cc->iv_private;
c0297721 325
fd2d231f 326 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
bbdb23b5 327 crypto_ahash_digestsize(essiv->hash_tfm));
fd2d231f
MP		 328 if (err)
329 return err;
c0297721
AK		 330
331 return 0;
b95bf2d3
MB		 332}
333
542da317
MB		 334/* Wipe salt and reset key derived from volume key */
335static int crypt_iv_essiv_wipe(struct crypt_config *cc)
336{
337 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 338 unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm);
c0297721 339 struct crypto_cipher *essiv_tfm;
fd2d231f 340 int r, err = 0;
542da317
MB		 341
342 memset(essiv->salt, 0, salt_size);
343
fd2d231f
MP		 344 essiv_tfm = cc->iv_private;
345 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
346 if (r)
347 err = r;
c0297721
AK		 348
349 return err;
350}
351
352/* Set up per cpu cipher state */
353static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
354 struct dm_target *ti,
355 u8 *salt, unsigned saltsize)
356{
357 struct crypto_cipher *essiv_tfm;
358 int err;
359
360 /* Setup the essiv_tfm with the given salt */
361 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
362 if (IS_ERR(essiv_tfm)) {
363 ti->error = "Error allocating crypto tfm for ESSIV";
364 return essiv_tfm;
365 }
366
ef43aa38 367 if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) {
c0297721
AK		 368 ti->error = "Block size of ESSIV cipher does "
369 "not match IV size of block cipher";
370 crypto_free_cipher(essiv_tfm);
371 return ERR_PTR(-EINVAL);
372 }
373
374 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
375 if (err) {
376 ti->error = "Failed to set key for ESSIV cipher";
377 crypto_free_cipher(essiv_tfm);
378 return ERR_PTR(err);
379 }
380
381 return essiv_tfm;
542da317
MB		 382}
383
60473592
MB		 384static void crypt_iv_essiv_dtr(struct crypt_config *cc)
385{
c0297721 386 struct crypto_cipher *essiv_tfm;
60473592
MB		 387 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
388
bbdb23b5 389 crypto_free_ahash(essiv->hash_tfm);
b95bf2d3
MB		 390 essiv->hash_tfm = NULL;
391
392 kzfree(essiv->salt);
393 essiv->salt = NULL;
c0297721 394
fd2d231f 395 essiv_tfm = cc->iv_private;
c0297721 396
fd2d231f
MP		 397 if (essiv_tfm)
398 crypto_free_cipher(essiv_tfm);
c0297721 399
fd2d231f 400 cc->iv_private = NULL;
60473592
MB		 401}
402
1da177e4 403static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
d469f841 404 const char *opts)
1da177e4 405{
5861f1be 406 struct crypto_cipher *essiv_tfm = NULL;
bbdb23b5 407 struct crypto_ahash *hash_tfm = NULL;
5861f1be 408 u8 *salt = NULL;
fd2d231f 409 int err;
1da177e4 410
5861f1be 411 if (!opts) {
72d94861 412 ti->error = "Digest algorithm missing for ESSIV mode";
1da177e4
LT		 413 return -EINVAL;
414 }
415
b95bf2d3 416 /* Allocate hash algorithm */
bbdb23b5 417 hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC);
35058687 418 if (IS_ERR(hash_tfm)) {
72d94861 419 ti->error = "Error initializing ESSIV hash";
5861f1be
MB		 420 err = PTR_ERR(hash_tfm);
421 goto bad;
1da177e4
LT		 422 }
423
bbdb23b5 424 salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL);
5861f1be 425 if (!salt) {
72d94861 426 ti->error = "Error kmallocing salt storage in ESSIV";
5861f1be
MB		 427 err = -ENOMEM;
428 goto bad;
1da177e4
LT		 429 }
430
b95bf2d3 431 cc->iv_gen_private.essiv.salt = salt;
b95bf2d3
MB		 432 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
433
fd2d231f 434 essiv_tfm = setup_essiv_cpu(cc, ti, salt,
bbdb23b5 435 crypto_ahash_digestsize(hash_tfm));
ef43aa38 436
fd2d231f
MP		 437 if (IS_ERR(essiv_tfm)) {
438 crypt_iv_essiv_dtr(cc);
439 return PTR_ERR(essiv_tfm);
c0297721 440 }
fd2d231f 441 cc->iv_private = essiv_tfm;
c0297721 442
1da177e4 443 return 0;
5861f1be
MB		 444
445bad:
5861f1be 446 if (hash_tfm && !IS_ERR(hash_tfm))
bbdb23b5 447 crypto_free_ahash(hash_tfm);
b95bf2d3 448 kfree(salt);
5861f1be 449 return err;
1da177e4
LT		 450}
451
2dc5327d
MB		 452static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
453 struct dm_crypt_request *dmreq)
1da177e4 454{
fd2d231f 455 struct crypto_cipher *essiv_tfm = cc->iv_private;
c0297721 456
1da177e4 457 memset(iv, 0, cc->iv_size);
283a8328 458 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721
AK		 459 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
460
1da177e4
LT		 461 return 0;
462}
463
48527fa7
RS		 464static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
465 const char *opts)
466{
bbdb23b5 467 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
f0d1b0b3 468 int log = ilog2(bs);
48527fa7
RS		 469
470 /* we need to calculate how far we must shift the sector count
471 * to get the cipher block count, we use this shift in _gen */
472
473 if (1 << log != bs) {
474 ti->error = "cypher blocksize is not a power of 2";
475 return -EINVAL;
476 }
477
478 if (log > 9) {
479 ti->error = "cypher blocksize is > 512";
480 return -EINVAL;
481 }
482
60473592 483 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 484
485 return 0;
486}
487
488static void crypt_iv_benbi_dtr(struct crypt_config *cc)
489{
48527fa7
RS		 490}
491
2dc5327d
MB		 492static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
493 struct dm_crypt_request *dmreq)
48527fa7 494{
79066ad3
HX		 495 __be64 val;
496
48527fa7 497 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 498
2dc5327d 499 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 500 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 501
1da177e4
LT		 502 return 0;
503}
504
2dc5327d
MB		 505static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
506 struct dm_crypt_request *dmreq)
46b47730
LN		 507{
508 memset(iv, 0, cc->iv_size);
509
510 return 0;
511}
512
34745785
MB		 513static void crypt_iv_lmk_dtr(struct crypt_config *cc)
514{
515 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
516
517 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
518 crypto_free_shash(lmk->hash_tfm);
519 lmk->hash_tfm = NULL;
520
521 kzfree(lmk->seed);
522 lmk->seed = NULL;
523}
524
525static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
526 const char *opts)
527{
528 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
529
8f0009a2
MB		 530 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
531 ti->error = "Unsupported sector size for LMK";
532 return -EINVAL;
533 }
534
34745785
MB		 535 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
536 if (IS_ERR(lmk->hash_tfm)) {
537 ti->error = "Error initializing LMK hash";
538 return PTR_ERR(lmk->hash_tfm);
539 }
540
541 /* No seed in LMK version 2 */
542 if (cc->key_parts == cc->tfms_count) {
543 lmk->seed = NULL;
544 return 0;
545 }
546
547 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
548 if (!lmk->seed) {
549 crypt_iv_lmk_dtr(cc);
550 ti->error = "Error kmallocing seed storage in LMK";
551 return -ENOMEM;
552 }
553
554 return 0;
555}
556
557static int crypt_iv_lmk_init(struct crypt_config *cc)
558{
559 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
560 int subkey_size = cc->key_size / cc->key_parts;
561
562 /* LMK seed is on the position of LMK_KEYS + 1 key */
563 if (lmk->seed)
564 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
565 crypto_shash_digestsize(lmk->hash_tfm));
566
567 return 0;
568}
569
570static int crypt_iv_lmk_wipe(struct crypt_config *cc)
571{
572 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
573
574 if (lmk->seed)
575 memset(lmk->seed, 0, LMK_SEED_SIZE);
576
577 return 0;
578}
579
580static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
581 struct dm_crypt_request *dmreq,
582 u8 *data)
583{
584 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 585 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 586 struct md5_state md5state;
da31a078 587 __le32 buf[4];
34745785
MB		 588 int i, r;
589
b6106265
JSM		 590 desc->tfm = lmk->hash_tfm;
591 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
34745785 592
b6106265 593 r = crypto_shash_init(desc);
34745785
MB		 594 if (r)
595 return r;
596
597 if (lmk->seed) {
b6106265 598 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 599 if (r)
600 return r;
601 }
602
603 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 604 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 605 if (r)
606 return r;
607
608 /* Sector is cropped to 56 bits here */
609 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
610 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
611 buf[2] = cpu_to_le32(4024);
612 buf[3] = 0;
b6106265 613 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 614 if (r)
615 return r;
616
617 /* No MD5 padding here */
b6106265 618 r = crypto_shash_export(desc, &md5state);
34745785
MB		 619 if (r)
620 return r;
621
622 for (i = 0; i < MD5_HASH_WORDS; i++)
623 __cpu_to_le32s(&md5state.hash[i]);
624 memcpy(iv, &md5state.hash, cc->iv_size);
625
626 return 0;
627}
628
629static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
630 struct dm_crypt_request *dmreq)
631{
ef43aa38 632 struct scatterlist *sg;
34745785
MB		 633 u8 *src;
634 int r = 0;
635
636 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 637 sg = crypt_get_sg_data(cc, dmreq->sg_in);
638 src = kmap_atomic(sg_page(sg));
639 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 640 kunmap_atomic(src);
34745785
MB		 641 } else
642 memset(iv, 0, cc->iv_size);
643
644 return r;
645}
646
647static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
648 struct dm_crypt_request *dmreq)
649{
ef43aa38 650 struct scatterlist *sg;
34745785
MB		 651 u8 *dst;
652 int r;
653
654 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
655 return 0;
656
ef43aa38
MB		 657 sg = crypt_get_sg_data(cc, dmreq->sg_out);
658 dst = kmap_atomic(sg_page(sg));
659 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 660
661 /* Tweak the first block of plaintext sector */
662 if (!r)
ef43aa38 663 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 664
c2e022cb 665 kunmap_atomic(dst);
34745785
MB		 666 return r;
667}
668
ed04d981
MB		 669static void crypt_iv_tcw_dtr(struct crypt_config *cc)
670{
671 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
672
673 kzfree(tcw->iv_seed);
674 tcw->iv_seed = NULL;
675 kzfree(tcw->whitening);
676 tcw->whitening = NULL;
677
678 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
679 crypto_free_shash(tcw->crc32_tfm);
680 tcw->crc32_tfm = NULL;
681}
682
683static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
684 const char *opts)
685{
686 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
687
8f0009a2
MB		 688 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
689 ti->error = "Unsupported sector size for TCW";
690 return -EINVAL;
691 }
692
ed04d981
MB		 693 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
694 ti->error = "Wrong key size for TCW";
695 return -EINVAL;
696 }
697
698 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
699 if (IS_ERR(tcw->crc32_tfm)) {
700 ti->error = "Error initializing CRC32 in TCW";
701 return PTR_ERR(tcw->crc32_tfm);
702 }
703
704 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
705 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
706 if (!tcw->iv_seed || !tcw->whitening) {
707 crypt_iv_tcw_dtr(cc);
708 ti->error = "Error allocating seed storage in TCW";
709 return -ENOMEM;
710 }
711
712 return 0;
713}
714
715static int crypt_iv_tcw_init(struct crypt_config *cc)
716{
717 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
718 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
719
720 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
721 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
722 TCW_WHITENING_SIZE);
723
724 return 0;
725}
726
727static int crypt_iv_tcw_wipe(struct crypt_config *cc)
728{
729 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
730
731 memset(tcw->iv_seed, 0, cc->iv_size);
732 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
733
734 return 0;
735}
736
737static int crypt_iv_tcw_whitening(struct crypt_config *cc,
738 struct dm_crypt_request *dmreq,
739 u8 *data)
740{
741 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 742 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 743 u8 buf[TCW_WHITENING_SIZE];
b6106265 744 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 745 int i, r;
746
747 /* xor whitening with sector number */
748 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
749 crypto_xor(buf, (u8 *)&sector, 8);
750 crypto_xor(&buf[8], (u8 *)&sector, 8);
751
752 /* calculate crc32 for every 32bit part and xor it */
b6106265
JSM		 753 desc->tfm = tcw->crc32_tfm;
754 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ed04d981 755 for (i = 0; i < 4; i++) {
b6106265 756 r = crypto_shash_init(desc);
ed04d981
MB		 757 if (r)
758 goto out;
b6106265 759 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 760 if (r)
761 goto out;
b6106265 762 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 763 if (r)
764 goto out;
765 }
766 crypto_xor(&buf[0], &buf[12], 4);
767 crypto_xor(&buf[4], &buf[8], 4);
768
769 /* apply whitening (8 bytes) to whole sector */
770 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
771 crypto_xor(data + i * 8, buf, 8);
772out:
1a71d6ff 773 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 774 return r;
775}
776
777static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
778 struct dm_crypt_request *dmreq)
779{
ef43aa38 780 struct scatterlist *sg;
ed04d981 781 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 782 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 783 u8 *src;
784 int r = 0;
785
786 /* Remove whitening from ciphertext */
787 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 788 sg = crypt_get_sg_data(cc, dmreq->sg_in);
789 src = kmap_atomic(sg_page(sg));
790 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 791 kunmap_atomic(src);
792 }
793
794 /* Calculate IV */
795 memcpy(iv, tcw->iv_seed, cc->iv_size);
796 crypto_xor(iv, (u8 *)&sector, 8);
797 if (cc->iv_size > 8)
798 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
799
800 return r;
801}
802
803static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
804 struct dm_crypt_request *dmreq)
805{
ef43aa38 806 struct scatterlist *sg;
ed04d981
MB		 807 u8 *dst;
808 int r;
809
810 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
811 return 0;
812
813 /* Apply whitening on ciphertext */
ef43aa38
MB		 814 sg = crypt_get_sg_data(cc, dmreq->sg_out);
815 dst = kmap_atomic(sg_page(sg));
816 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 817 kunmap_atomic(dst);
818
819 return r;
820}
821
ef43aa38
MB		 822static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
823 struct dm_crypt_request *dmreq)
824{
825 /* Used only for writes, there must be an additional space to store IV */
826 get_random_bytes(iv, cc->iv_size);
827 return 0;
828}
829
1b1b58f5 830static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 831 .generator = crypt_iv_plain_gen
832};
833
1b1b58f5 834static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 835 .generator = crypt_iv_plain64_gen
836};
837
1b1b58f5 838static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 839 .ctr = crypt_iv_essiv_ctr,
840 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 841 .init = crypt_iv_essiv_init,
542da317 842 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 843 .generator = crypt_iv_essiv_gen
844};
845
1b1b58f5 846static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 847 .ctr = crypt_iv_benbi_ctr,
848 .dtr = crypt_iv_benbi_dtr,
849 .generator = crypt_iv_benbi_gen
850};
1da177e4 851
1b1b58f5 852static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 853 .generator = crypt_iv_null_gen
854};
855
1b1b58f5 856static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 857 .ctr = crypt_iv_lmk_ctr,
858 .dtr = crypt_iv_lmk_dtr,
859 .init = crypt_iv_lmk_init,
860 .wipe = crypt_iv_lmk_wipe,
861 .generator = crypt_iv_lmk_gen,
862 .post = crypt_iv_lmk_post
863};
864
1b1b58f5 865static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 866 .ctr = crypt_iv_tcw_ctr,
867 .dtr = crypt_iv_tcw_dtr,
868 .init = crypt_iv_tcw_init,
869 .wipe = crypt_iv_tcw_wipe,
870 .generator = crypt_iv_tcw_gen,
871 .post = crypt_iv_tcw_post
872};
873
ef43aa38
MB		 874static struct crypt_iv_operations crypt_iv_random_ops = {
875 .generator = crypt_iv_random_gen
876};
877
878/*
879 * Integrity extensions
880 */
881static bool crypt_integrity_aead(struct crypt_config *cc)
882{
883 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
884}
885
886static bool crypt_integrity_hmac(struct crypt_config *cc)
887{
33d2f09f 888 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 889}
890
891/* Get sg containing data */
892static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
893 struct scatterlist *sg)
894{
33d2f09f 895 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 896 return &sg[2];
897
898 return sg;
899}
900
901static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
902{
903 struct bio_integrity_payload *bip;
904 unsigned int tag_len;
905 int ret;
906
907 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
908 return 0;
909
910 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
911 if (IS_ERR(bip))
912 return PTR_ERR(bip);
913
914 tag_len = io->cc->on_disk_tag_size * bio_sectors(bio);
915
916 bip->bip_iter.bi_size = tag_len;
917 bip->bip_iter.bi_sector = io->cc->start + io->sector;
918
919 /* We own the metadata, do not let bio_free to release it */
920 bip->bip_flags &= ~BIP_BLOCK_INTEGRITY;
921
922 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
923 tag_len, offset_in_page(io->integrity_metadata));
924 if (unlikely(ret != tag_len))
925 return -ENOMEM;
926
927 return 0;
928}
929
930static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
931{
932#ifdef CONFIG_BLK_DEV_INTEGRITY
933 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
934
935 /* From now we require underlying device with our integrity profile */
936 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
937 ti->error = "Integrity profile not supported.";
938 return -EINVAL;
939 }
940
941 if (bi->tag_size != cc->on_disk_tag_size) {
942 ti->error = "Integrity profile tag size mismatch.";
943 return -EINVAL;
944 }
945
33d2f09f 946 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 947 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
948 DMINFO("Integrity AEAD, tag size %u, IV size %u.",
949 cc->integrity_tag_size, cc->integrity_iv_size);
950
951 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
952 ti->error = "Integrity AEAD auth tag size is not supported.";
953 return -EINVAL;
954 }
955 } else if (cc->integrity_iv_size)
956 DMINFO("Additional per-sector space %u bytes for IV.",
957 cc->integrity_iv_size);
958
959 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
960 ti->error = "Not enough space for integrity tag in the profile.";
961 return -EINVAL;
962 }
963
964 return 0;
965#else
966 ti->error = "Integrity profile not supported.";
967 return -EINVAL;
968#endif
969}
970
d469f841
MB		 971static void crypt_convert_init(struct crypt_config *cc,
972 struct convert_context *ctx,
973 struct bio *bio_out, struct bio *bio_in,
fcd369da 974 sector_t sector)
1da177e4
LT		 975{
976 ctx->bio_in = bio_in;
977 ctx->bio_out = bio_out;
003b5c57
KO		 978 if (bio_in)
979 ctx->iter_in = bio_in->bi_iter;
980 if (bio_out)
981 ctx->iter_out = bio_out->bi_iter;
c66029f4 982 ctx->cc_sector = sector + cc->iv_offset;
43d69034 983 init_completion(&ctx->restart);
1da177e4
LT		 984}
985
b2174eeb 986static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 987 void *req)
b2174eeb
HY		 988{
989 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
990}
991
ef43aa38 992static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 993{
ef43aa38 994 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 995}
996
2dc5327d
MB		 997static u8 *iv_of_dmreq(struct crypt_config *cc,
998 struct dm_crypt_request *dmreq)
999{
33d2f09f 1000 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1001 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1002 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1003 else
1004 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1005 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1006}
1007
ef43aa38
MB		 1008static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1009 struct dm_crypt_request *dmreq)
1010{
1011 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1012}
1013
1014static uint64_t *org_sector_of_dmreq(struct crypt_config *cc,
1015 struct dm_crypt_request *dmreq)
1016{
1017 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
1018 return (uint64_t*) ptr;
1019}
1020
1021static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1022 struct dm_crypt_request *dmreq)
1023{
1024 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1025 cc->iv_size + sizeof(uint64_t);
1026 return (unsigned int*)ptr;
1027}
1028
1029static void *tag_from_dmreq(struct crypt_config *cc,
1030 struct dm_crypt_request *dmreq)
1031{
1032 struct convert_context *ctx = dmreq->ctx;
1033 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1034
1035 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1036 cc->on_disk_tag_size];
1037}
1038
1039static void *iv_tag_from_dmreq(struct crypt_config *cc,
1040 struct dm_crypt_request *dmreq)
1041{
1042 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1043}
1044
1045static int crypt_convert_block_aead(struct crypt_config *cc,
1046 struct convert_context *ctx,
1047 struct aead_request *req,
1048 unsigned int tag_offset)
01482b76 1049{
003b5c57
KO		 1050 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1051 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1052 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1053 u8 *iv, *org_iv, *tag_iv, *tag;
1054 uint64_t *sector;
1055 int r = 0;
1056
1057 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1058
8f0009a2
MB		 1059 /* Reject unexpected unaligned bio. */
1060 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1061 return -EIO;
1062
b2174eeb 1063 dmreq = dmreq_of_req(cc, req);
ef43aa38 1064 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1065 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1066 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1067 dmreq->ctx = ctx;
1068
1069 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1070
1071 sector = org_sector_of_dmreq(cc, dmreq);
1072 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1073
2dc5327d 1074 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1075 org_iv = org_iv_of_dmreq(cc, dmreq);
1076 tag = tag_from_dmreq(cc, dmreq);
1077 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1078
1079 /* AEAD request:
1080 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1081 * | (authenticated) | (auth+encryption) | |
1082 * | sector_LE | IV | sector in/out | tag in/out |
1083 */
1084 sg_init_table(dmreq->sg_in, 4);
1085 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1086 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1087 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1088 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1089
1090 sg_init_table(dmreq->sg_out, 4);
1091 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1092 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1093 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1094 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1095
1096 if (cc->iv_gen_ops) {
1097 /* For READs use IV stored in integrity metadata */
1098 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1099 memcpy(org_iv, tag_iv, cc->iv_size);
1100 } else {
1101 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1102 if (r < 0)
1103 return r;
1104 /* Store generated IV in integrity metadata */
1105 if (cc->integrity_iv_size)
1106 memcpy(tag_iv, org_iv, cc->iv_size);
1107 }
1108 /* Working copy of IV, to be modified in crypto API */
1109 memcpy(iv, org_iv, cc->iv_size);
1110 }
1111
1112 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1113 if (bio_data_dir(ctx->bio_in) == WRITE) {
1114 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1115 cc->sector_size, iv);
ef43aa38
MB		 1116 r = crypto_aead_encrypt(req);
1117 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1118 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1119 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1120 } else {
1121 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1122 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1123 r = crypto_aead_decrypt(req);
1124 }
1125
1126 if (r == -EBADMSG)
1127 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1128 (unsigned long long)le64_to_cpu(*sector));
1129
1130 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1131 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1132
8f0009a2
MB		 1133 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1134 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1135
ef43aa38
MB		 1136 return r;
1137}
1138
1139static int crypt_convert_block_skcipher(struct crypt_config *cc,
1140 struct convert_context *ctx,
1141 struct skcipher_request *req,
1142 unsigned int tag_offset)
1143{
1144 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1145 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1146 struct scatterlist *sg_in, *sg_out;
1147 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1148 u8 *iv, *org_iv, *tag_iv;
1149 uint64_t *sector;
1150 int r = 0;
1151
8f0009a2
MB		 1152 /* Reject unexpected unaligned bio. */
1153 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1154 return -EIO;
1155
ef43aa38 1156 dmreq = dmreq_of_req(cc, req);
c66029f4 1157 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1158 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1159 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1160 dmreq->ctx = ctx;
01482b76 1161
ef43aa38
MB		 1162 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1163
1164 iv = iv_of_dmreq(cc, dmreq);
1165 org_iv = org_iv_of_dmreq(cc, dmreq);
1166 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1167
1168 sector = org_sector_of_dmreq(cc, dmreq);
1169 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1170
1171 /* For skcipher we use only the first sg item */
1172 sg_in = &dmreq->sg_in[0];
1173 sg_out = &dmreq->sg_out[0];
01482b76 1174
ef43aa38 1175 sg_init_table(sg_in, 1);
8f0009a2 1176 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1177
1178 sg_init_table(sg_out, 1);
8f0009a2 1179 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1180
3a7f6c99 1181 if (cc->iv_gen_ops) {
ef43aa38
MB		 1182 /* For READs use IV stored in integrity metadata */
1183 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1184 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1185 } else {
1186 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1187 if (r < 0)
1188 return r;
1189 /* Store generated IV in integrity metadata */
1190 if (cc->integrity_iv_size)
1191 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1192 }
1193 /* Working copy of IV, to be modified in crypto API */
1194 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1195 }
1196
8f0009a2 1197 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1198
1199 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1200 r = crypto_skcipher_encrypt(req);
3a7f6c99 1201 else
bbdb23b5 1202 r = crypto_skcipher_decrypt(req);
3a7f6c99 1203
2dc5327d 1204 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1205 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1206
8f0009a2
MB		 1207 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1208 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1209
3a7f6c99 1210 return r;
01482b76
MB		 1211}
1212
95497a96
MB		 1213static void kcryptd_async_done(struct crypto_async_request *async_req,
1214 int error);
c0297721 1215
ef43aa38
MB		 1216static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1217 struct convert_context *ctx)
ddd42edf 1218{
c66029f4 1219 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1220
ef43aa38
MB		 1221 if (!ctx->r.req)
1222 ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO);
1223
1224 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
1225
1226 /*
1227 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1228 * requests if driver request queue is full.
1229 */
1230 skcipher_request_set_callback(ctx->r.req,
1231 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
1232 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
1233}
1234
1235static void crypt_alloc_req_aead(struct crypt_config *cc,
1236 struct convert_context *ctx)
1237{
1238 if (!ctx->r.req_aead)
1239 ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1240
ef43aa38 1241 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1242
1243 /*
1244 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1245 * requests if driver request queue is full.
1246 */
ef43aa38 1247 aead_request_set_callback(ctx->r.req_aead,
c0297721 1248 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38
MB		 1249 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1250}
1251
1252static void crypt_alloc_req(struct crypt_config *cc,
1253 struct convert_context *ctx)
1254{
33d2f09f 1255 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1256 crypt_alloc_req_aead(cc, ctx);
1257 else
1258 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1259}
1260
ef43aa38
MB		 1261static void crypt_free_req_skcipher(struct crypt_config *cc,
1262 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1263{
1264 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1265
bbdb23b5 1266 if ((struct skcipher_request *)(io + 1) != req)
298a9fa0
MP		 1267 mempool_free(req, cc->req_pool);
1268}
1269
ef43aa38
MB		 1270static void crypt_free_req_aead(struct crypt_config *cc,
1271 struct aead_request *req, struct bio *base_bio)
1272{
1273 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1274
1275 if ((struct aead_request *)(io + 1) != req)
1276 mempool_free(req, cc->req_pool);
1277}
1278
1279static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1280{
33d2f09f 1281 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1282 crypt_free_req_aead(cc, req, base_bio);
1283 else
1284 crypt_free_req_skcipher(cc, req, base_bio);
1285}
1286
1da177e4
LT		 1287/*
1288 * Encrypt / decrypt data from one bio to another one (can be the same one)
1289 */
1290static int crypt_convert(struct crypt_config *cc,
d469f841 1291 struct convert_context *ctx)
1da177e4 1292{
ef43aa38 1293 unsigned int tag_offset = 0;
ff3af92b 1294 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1295 int r;
1da177e4 1296
40b6229b 1297 atomic_set(&ctx->cc_pending, 1);
c8081618 1298
003b5c57 1299 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1300
3a7f6c99 1301 crypt_alloc_req(cc, ctx);
40b6229b 1302 atomic_inc(&ctx->cc_pending);
3f1e9070 1303
33d2f09f 1304 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1305 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1306 else
1307 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1308
1309 switch (r) {
54cea3f6
MB		 1310 /*
1311 * The request was queued by a crypto driver
1312 * but the driver request queue is full, let's wait.
1313 */
3a7f6c99
MB		 1314 case -EBUSY:
1315 wait_for_completion(&ctx->restart);
16735d02 1316 reinit_completion(&ctx->restart);
54cea3f6
MB		 1317 /* fall through */
1318 /*
1319 * The request is queued and processed asynchronously,
1320 * completion function kcryptd_async_done() will be called.
1321 */
c0403ec0 1322 case -EINPROGRESS:
ef43aa38 1323 ctx->r.req = NULL;
8f0009a2
MB		 1324 ctx->cc_sector += sector_step;
1325 tag_offset += sector_step;
3f1e9070 1326 continue;
54cea3f6
MB		 1327 /*
1328 * The request was already processed (synchronously).
1329 */
3a7f6c99 1330 case 0:
40b6229b 1331 atomic_dec(&ctx->cc_pending);
8f0009a2
MB		 1332 ctx->cc_sector += sector_step;
1333 tag_offset += sector_step;
c7f1b204 1334 cond_resched();
3a7f6c99 1335 continue;
ef43aa38
MB		 1336 /*
1337 * There was a data integrity error.
1338 */
1339 case -EBADMSG:
1340 atomic_dec(&ctx->cc_pending);
1341 return -EILSEQ;
1342 /*
1343 * There was an error while processing the request.
1344 */
3f1e9070 1345 default:
40b6229b 1346 atomic_dec(&ctx->cc_pending);
ef43aa38 1347 return -EIO;
3f1e9070 1348 }
1da177e4
LT		 1349 }
1350
3f1e9070 1351 return 0;
1da177e4
LT		 1352}
1353
cf2f1abf
MP		 1354static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1355
1da177e4
LT		 1356/*
1357 * Generate a new unfragmented bio with the given size
586b286b
MS		 1358 * This should never violate the device limitations (but only because
1359 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1360 *
1361 * This function may be called concurrently. If we allocate from the mempool
1362 * concurrently, there is a possibility of deadlock. For example, if we have
1363 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1364 * the mempool concurrently, it may deadlock in a situation where both processes
1365 * have allocated 128 pages and the mempool is exhausted.
1366 *
1367 * In order to avoid this scenario we allocate the pages under a mutex.
1368 *
1369 * In order to not degrade performance with excessive locking, we try
1370 * non-blocking allocations without a mutex first but on failure we fallback
1371 * to blocking allocations with a mutex.
1da177e4 1372 */
cf2f1abf 1373static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1374{
49a8a920 1375 struct crypt_config *cc = io->cc;
8b004457 1376 struct bio *clone;
1da177e4 1377 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1378 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1379 unsigned i, len, remaining_size;
91e10625 1380 struct page *page;
1da177e4 1381
7145c241 1382retry:
d0164adc 1383 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1384 mutex_lock(&cc->bio_alloc_lock);
1385
2f9941b6 1386 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
8b004457 1387 if (!clone)
ef43aa38 1388 goto out;
1da177e4 1389
027581f3 1390 clone_init(io, clone);
6a24c718 1391
7145c241
MP		 1392 remaining_size = size;
1393
f97380bc 1394 for (i = 0; i < nr_iovecs; i++) {
91e10625 1395 page = mempool_alloc(cc->page_pool, gfp_mask);
7145c241
MP		 1396 if (!page) {
1397 crypt_free_buffer_pages(cc, clone);
1398 bio_put(clone);
d0164adc 1399 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1400 goto retry;
1401 }
1da177e4 1402
7145c241 1403 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1404
0dae7fe5 1405 bio_add_page(clone, page, len, 0);
1da177e4 1406
7145c241 1407 remaining_size -= len;
1da177e4
LT		 1408 }
1409
ef43aa38
MB		 1410 /* Allocate space for integrity tags */
1411 if (dm_crypt_integrity_io_alloc(io, clone)) {
1412 crypt_free_buffer_pages(cc, clone);
1413 bio_put(clone);
1414 clone = NULL;
1415 }
1416out:
d0164adc 1417 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1418 mutex_unlock(&cc->bio_alloc_lock);
1419
8b004457 1420 return clone;
1da177e4
LT		 1421}
1422
644bd2f0 1423static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1424{
644bd2f0 1425 unsigned int i;
1da177e4
LT		 1426 struct bio_vec *bv;
1427
cb34e057 1428 bio_for_each_segment_all(bv, clone, i) {
1da177e4
LT		 1429 BUG_ON(!bv->bv_page);
1430 mempool_free(bv->bv_page, cc->page_pool);
1431 bv->bv_page = NULL;
1432 }
1433}
1434
298a9fa0
MP		 1435static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1436 struct bio *bio, sector_t sector)
dc440d1e 1437{
49a8a920 1438 io->cc = cc;
dc440d1e
MB		 1439 io->base_bio = bio;
1440 io->sector = sector;
1441 io->error = 0;
ef43aa38
MB		 1442 io->ctx.r.req = NULL;
1443 io->integrity_metadata = NULL;
1444 io->integrity_metadata_from_pool = false;
40b6229b 1445 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1446}
1447
3e1a8bdd
MB		 1448static void crypt_inc_pending(struct dm_crypt_io *io)
1449{
40b6229b 1450 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1451}
1452
1da177e4
LT		 1453/*
1454 * One of the bios was finished. Check for completion of
1455 * the whole request and correctly clean up the buffer.
1456 */
5742fd77 1457static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1458{
49a8a920 1459 struct crypt_config *cc = io->cc;
b35f8caa 1460 struct bio *base_bio = io->base_bio;
b35f8caa 1461 int error = io->error;
1da177e4 1462
40b6229b 1463 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1464 return;
1465
ef43aa38
MB		 1466 if (io->ctx.r.req)
1467 crypt_free_req(cc, io->ctx.r.req, base_bio);
1468
1469 if (unlikely(io->integrity_metadata_from_pool))
1470 mempool_free(io->integrity_metadata, io->cc->tag_pool);
1471 else
1472 kfree(io->integrity_metadata);
b35f8caa 1473
4246a0b6
CH		 1474 base_bio->bi_error = error;
1475 bio_endio(base_bio);
1da177e4
LT		 1476}
1477
1478/*
cabf08e4 1479 * kcryptd/kcryptd_io:
1da177e4
LT		 1480 *
1481 * Needed because it would be very unwise to do decryption in an
23541d2d 1482 * interrupt context.
cabf08e4
MB		 1483 *
1484 * kcryptd performs the actual encryption or decryption.
1485 *
1486 * kcryptd_io performs the IO submission.
1487 *
1488 * They must be separated as otherwise the final stages could be
1489 * starved by new requests which can block in the first stages due
1490 * to memory allocation.
c0297721
AK		 1491 *
1492 * The work is done per CPU global for all dm-crypt instances.
1493 * They should not depend on each other and do not block.
1da177e4 1494 */
4246a0b6 1495static void crypt_endio(struct bio *clone)
8b004457 1496{
028867ac 1497 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1498 struct crypt_config *cc = io->cc;
ee7a491e 1499 unsigned rw = bio_data_dir(clone);
9b81c842 1500 int error;
8b004457
MB		 1501
1502 /*
6712ecf8 1503 * free the processed pages
8b004457 1504 */
ee7a491e 1505 if (rw == WRITE)
644bd2f0 1506 crypt_free_buffer_pages(cc, clone);
8b004457 1507
9b81c842 1508 error = clone->bi_error;
8b004457 1509 bio_put(clone);
8b004457 1510
9b81c842 1511 if (rw == READ && !error) {
ee7a491e
MB		 1512 kcryptd_queue_crypt(io);
1513 return;
1514 }
5742fd77 1515
9b81c842
SL		 1516 if (unlikely(error))
1517 io->error = error;
5742fd77
MB		 1518
1519 crypt_dec_pending(io);
8b004457
MB		 1520}
1521
028867ac 1522static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1523{
49a8a920 1524 struct crypt_config *cc = io->cc;
8b004457
MB		 1525
1526 clone->bi_private = io;
1527 clone->bi_end_io = crypt_endio;
1528 clone->bi_bdev = cc->dev->bdev;
ef295ecf 1529 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1530}
1531
20c82538 1532static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1533{
49a8a920 1534 struct crypt_config *cc = io->cc;
8b004457 1535 struct bio *clone;
93e605c2 1536
8b004457 1537 /*
59779079
MS		 1538 * We need the original biovec array in order to decrypt
1539 * the whole bio data *afterwards* -- thanks to immutable
1540 * biovecs we don't need to worry about the block layer
1541 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1542 */
59779079 1543 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
7eaceacc 1544 if (!clone)
20c82538 1545 return 1;
8b004457 1546
20c82538
MB		 1547 crypt_inc_pending(io);
1548
8b004457 1549 clone_init(io, clone);
4f024f37 1550 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1551
ef43aa38
MB		 1552 if (dm_crypt_integrity_io_alloc(io, clone)) {
1553 crypt_dec_pending(io);
1554 bio_put(clone);
1555 return 1;
1556 }
1557
93e605c2 1558 generic_make_request(clone);
20c82538 1559 return 0;
8b004457
MB		 1560}
1561
dc267621
MP		 1562static void kcryptd_io_read_work(struct work_struct *work)
1563{
1564 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1565
1566 crypt_inc_pending(io);
1567 if (kcryptd_io_read(io, GFP_NOIO))
1568 io->error = -ENOMEM;
1569 crypt_dec_pending(io);
1570}
1571
1572static void kcryptd_queue_read(struct dm_crypt_io *io)
1573{
1574 struct crypt_config *cc = io->cc;
1575
1576 INIT_WORK(&io->work, kcryptd_io_read_work);
1577 queue_work(cc->io_queue, &io->work);
1578}
1579
4e4eef64
MB		 1580static void kcryptd_io_write(struct dm_crypt_io *io)
1581{
95497a96 1582 struct bio *clone = io->ctx.bio_out;
dc267621 1583
95497a96 1584 generic_make_request(clone);
4e4eef64
MB		 1585}
1586
b3c5fd30
MP		 1587#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1588
dc267621 1589static int dmcrypt_write(void *data)
395b167c 1590{
dc267621 1591 struct crypt_config *cc = data;
b3c5fd30
MP		 1592 struct dm_crypt_io *io;
1593
dc267621 1594 while (1) {
b3c5fd30 1595 struct rb_root write_tree;
dc267621 1596 struct blk_plug plug;
395b167c 1597
dc267621 1598 DECLARE_WAITQUEUE(wait, current);
395b167c 1599
dc267621
MP		 1600 spin_lock_irq(&cc->write_thread_wait.lock);
1601continue_locked:
395b167c 1602
b3c5fd30 1603 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1604 goto pop_from_list;
1605
f659b100 1606 set_current_state(TASK_INTERRUPTIBLE);
dc267621
MP		 1607 __add_wait_queue(&cc->write_thread_wait, &wait);
1608
1609 spin_unlock_irq(&cc->write_thread_wait.lock);
1610
f659b100 1611 if (unlikely(kthread_should_stop())) {
642fa448 1612 set_current_state(TASK_RUNNING);
f659b100
RV		 1613 remove_wait_queue(&cc->write_thread_wait, &wait);
1614 break;
1615 }
1616
dc267621
MP		 1617 schedule();
1618
642fa448 1619 set_current_state(TASK_RUNNING);
dc267621
MP		 1620 spin_lock_irq(&cc->write_thread_wait.lock);
1621 __remove_wait_queue(&cc->write_thread_wait, &wait);
1622 goto continue_locked;
1623
1624pop_from_list:
b3c5fd30
MP		 1625 write_tree = cc->write_tree;
1626 cc->write_tree = RB_ROOT;
dc267621
MP		 1627 spin_unlock_irq(&cc->write_thread_wait.lock);
1628
b3c5fd30
MP		 1629 BUG_ON(rb_parent(write_tree.rb_node));
1630
1631 /*
1632 * Note: we cannot walk the tree here with rb_next because
1633 * the structures may be freed when kcryptd_io_write is called.
1634 */
dc267621
MP		 1635 blk_start_plug(&plug);
1636 do {
b3c5fd30
MP		 1637 io = crypt_io_from_node(rb_first(&write_tree));
1638 rb_erase(&io->rb_node, &write_tree);
dc267621 1639 kcryptd_io_write(io);
b3c5fd30 1640 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1641 blk_finish_plug(&plug);
1642 }
1643 return 0;
395b167c
AK		 1644}
1645
72c6e7af 1646static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1647{
dec1cedf 1648 struct bio *clone = io->ctx.bio_out;
49a8a920 1649 struct crypt_config *cc = io->cc;
dc267621 1650 unsigned long flags;
b3c5fd30
MP		 1651 sector_t sector;
1652 struct rb_node **rbp, *parent;
dec1cedf 1653
72c6e7af 1654 if (unlikely(io->error < 0)) {
dec1cedf
MB		 1655 crypt_free_buffer_pages(cc, clone);
1656 bio_put(clone);
6c031f41 1657 crypt_dec_pending(io);
dec1cedf
MB		 1658 return;
1659 }
1660
1661 /* crypt_convert should have filled the clone bio */
003b5c57 1662 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1663
4f024f37 1664 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1665
0f5d8e6e
MP		 1666 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1667 generic_make_request(clone);
1668 return;
1669 }
1670
dc267621 1671 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
b3c5fd30
MP		 1672 rbp = &cc->write_tree.rb_node;
1673 parent = NULL;
1674 sector = io->sector;
1675 while (*rbp) {
1676 parent = *rbp;
1677 if (sector < crypt_io_from_node(parent)->sector)
1678 rbp = &(*rbp)->rb_left;
1679 else
1680 rbp = &(*rbp)->rb_right;
1681 }
1682 rb_link_node(&io->rb_node, parent, rbp);
1683 rb_insert_color(&io->rb_node, &cc->write_tree);
1684
dc267621
MP		 1685 wake_up_locked(&cc->write_thread_wait);
1686 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
4e4eef64
MB		 1687}
1688
fc5a5e9a 1689static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1690{
49a8a920 1691 struct crypt_config *cc = io->cc;
8b004457 1692 struct bio *clone;
c8081618 1693 int crypt_finished;
b635b00e 1694 sector_t sector = io->sector;
dec1cedf 1695 int r;
8b004457 1696
fc5a5e9a
MB		 1697 /*
1698 * Prevent io from disappearing until this function completes.
1699 */
1700 crypt_inc_pending(io);
b635b00e 1701 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1702
cf2f1abf
MP		 1703 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1704 if (unlikely(!clone)) {
1705 io->error = -EIO;
1706 goto dec;
1707 }
c8081618 1708
cf2f1abf
MP		 1709 io->ctx.bio_out = clone;
1710 io->ctx.iter_out = clone->bi_iter;
b635b00e 1711
cf2f1abf 1712 sector += bio_sectors(clone);
93e605c2 1713
cf2f1abf
MP		 1714 crypt_inc_pending(io);
1715 r = crypt_convert(cc, &io->ctx);
ef43aa38
MB		 1716 if (r < 0)
1717 io->error = r;
cf2f1abf 1718 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1719
cf2f1abf
MP		 1720 /* Encryption was already finished, submit io now */
1721 if (crypt_finished) {
1722 kcryptd_crypt_write_io_submit(io, 0);
1723 io->sector = sector;
93e605c2 1724 }
899c95d3 1725
cf2f1abf 1726dec:
899c95d3 1727 crypt_dec_pending(io);
84131db6
MB		 1728}
1729
72c6e7af 1730static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1731{
5742fd77
MB		 1732 crypt_dec_pending(io);
1733}
1734
4e4eef64 1735static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1736{
49a8a920 1737 struct crypt_config *cc = io->cc;
5742fd77 1738 int r = 0;
1da177e4 1739
3e1a8bdd 1740 crypt_inc_pending(io);
3a7f6c99 1741
53017030 1742 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1743 io->sector);
1da177e4 1744
5742fd77 1745 r = crypt_convert(cc, &io->ctx);
72c6e7af 1746 if (r < 0)
ef43aa38 1747 io->error = r;
5742fd77 1748
40b6229b 1749 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1750 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1751
1752 crypt_dec_pending(io);
1da177e4
LT		 1753}
1754
95497a96
MB		 1755static void kcryptd_async_done(struct crypto_async_request *async_req,
1756 int error)
1757{
b2174eeb
HY		 1758 struct dm_crypt_request *dmreq = async_req->data;
1759 struct convert_context *ctx = dmreq->ctx;
95497a96 1760 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1761 struct crypt_config *cc = io->cc;
95497a96 1762
54cea3f6
MB		 1763 /*
1764 * A request from crypto driver backlog is going to be processed now,
1765 * finish the completion and continue in crypt_convert().
1766 * (Callback will be called for the second time for this request.)
1767 */
c0403ec0
RV		 1768 if (error == -EINPROGRESS) {
1769 complete(&ctx->restart);
95497a96 1770 return;
c0403ec0 1771 }
95497a96 1772
2dc5327d 1773 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 1774 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 1775
ef43aa38
MB		 1776 if (error == -EBADMSG) {
1777 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1778 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
1779 io->error = -EILSEQ;
1780 } else if (error < 0)
72c6e7af
MP		 1781 io->error = -EIO;
1782
298a9fa0 1783 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1784
40b6229b 1785 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1786 return;
95497a96
MB		 1787
1788 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1789 kcryptd_crypt_read_done(io);
95497a96 1790 else
72c6e7af 1791 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1792}
1793
395b167c 1794static void kcryptd_crypt(struct work_struct *work)
1da177e4 1795{
028867ac 1796 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1797
cabf08e4 1798 if (bio_data_dir(io->base_bio) == READ)
395b167c 1799 kcryptd_crypt_read_convert(io);
4e4eef64 1800 else
395b167c 1801 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1802}
1803
395b167c 1804static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1805{
49a8a920 1806 struct crypt_config *cc = io->cc;
cabf08e4 1807
395b167c
AK		 1808 INIT_WORK(&io->work, kcryptd_crypt);
1809 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1810}
1811
1812/*
1813 * Decode key from its hex representation
1814 */
1815static int crypt_decode_key(u8 *key, char *hex, unsigned int size)
1816{
1817 char buffer[3];
1da177e4
LT		 1818 unsigned int i;
1819
1820 buffer[2] = '\0';
1821
8b004457 1822 for (i = 0; i < size; i++) {
1da177e4
LT		 1823 buffer[0] = *hex++;
1824 buffer[1] = *hex++;
1825
1a66a08a 1826 if (kstrtou8(buffer, 16, &key[i]))
1da177e4
LT		 1827 return -EINVAL;
1828 }
1829
1830 if (*hex != '\0')
1831 return -EINVAL;
1832
1833 return 0;
1834}
1835
ef43aa38
MB		 1836static void crypt_free_tfms_aead(struct crypt_config *cc)
1837{
1838 if (!cc->cipher_tfm.tfms_aead)
1839 return;
1840
1841 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1842 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1843 cc->cipher_tfm.tfms_aead[0] = NULL;
1844 }
1845
1846 kfree(cc->cipher_tfm.tfms_aead);
1847 cc->cipher_tfm.tfms_aead = NULL;
1848}
1849
1850static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1851{
d1f96423
MB		 1852 unsigned i;
1853
ef43aa38 1854 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1855 return;
1856
d1f96423 1857 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1858 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1859 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1860 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1861 }
fd2d231f 1862
ef43aa38
MB		 1863 kfree(cc->cipher_tfm.tfms);
1864 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1865}
1866
ef43aa38
MB		 1867static void crypt_free_tfms(struct crypt_config *cc)
1868{
33d2f09f 1869 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1870 crypt_free_tfms_aead(cc);
1871 else
1872 crypt_free_tfms_skcipher(cc);
1873}
1874
1875static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1876{
d1f96423
MB		 1877 unsigned i;
1878 int err;
1879
ef43aa38
MB		 1880 cc->cipher_tfm.tfms = kzalloc(cc->tfms_count *
1881 sizeof(struct crypto_skcipher *), GFP_KERNEL);
1882 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1883 return -ENOMEM;
1884
d1f96423 1885 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1886 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1887 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1888 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1889 crypt_free_tfms(cc);
d1f96423
MB		 1890 return err;
1891 }
1892 }
1893
1894 return 0;
1895}
1896
ef43aa38
MB		 1897static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1898{
ef43aa38
MB		 1899 int err;
1900
1901 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1902 if (!cc->cipher_tfm.tfms)
1903 return -ENOMEM;
1904
ef43aa38
MB		 1905 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1906 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1907 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1908 crypt_free_tfms(cc);
1909 return err;
1910 }
1911
ef43aa38
MB		 1912 return 0;
1913}
1914
1915static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1916{
33d2f09f 1917 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1918 return crypt_alloc_tfms_aead(cc, ciphermode);
1919 else
1920 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1921}
1922
1923static unsigned crypt_subkey_size(struct crypt_config *cc)
1924{
1925 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1926}
1927
1928static unsigned crypt_authenckey_size(struct crypt_config *cc)
1929{
1930 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1931}
1932
1933/*
1934 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1935 * the key must be for some reason in special format.
1936 * This funcion converts cc->key to this special format.
1937 */
1938static void crypt_copy_authenckey(char *p, const void *key,
1939 unsigned enckeylen, unsigned authkeylen)
1940{
1941 struct crypto_authenc_key_param *param;
1942 struct rtattr *rta;
1943
1944 rta = (struct rtattr *)p;
1945 param = RTA_DATA(rta);
1946 param->enckeylen = cpu_to_be32(enckeylen);
1947 rta->rta_len = RTA_LENGTH(sizeof(*param));
1948 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1949 p += RTA_SPACE(sizeof(*param));
1950 memcpy(p, key + enckeylen, authkeylen);
1951 p += authkeylen;
1952 memcpy(p, key, enckeylen);
1953}
1954
671ea6b4 1955static int crypt_setkey(struct crypt_config *cc)
c0297721 1956{
da31a078 1957 unsigned subkey_size;
fd2d231f
MP		 1958 int err = 0, i, r;
1959
da31a078 1960 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1961 subkey_size = crypt_subkey_size(cc);
da31a078 1962
ef43aa38
MB		 1963 if (crypt_integrity_hmac(cc))
1964 crypt_copy_authenckey(cc->authenc_key, cc->key,
1965 subkey_size - cc->key_mac_size,
1966 cc->key_mac_size);
fd2d231f 1967 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 1968 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 1969 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1970 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 1971 else if (crypt_integrity_aead(cc))
1972 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1973 cc->key + (i * subkey_size),
1974 subkey_size);
ef43aa38
MB		 1975 else
1976 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
1977 cc->key + (i * subkey_size),
1978 subkey_size);
fd2d231f
MP		 1979 if (r)
1980 err = r;
c0297721
AK		 1981 }
1982
ef43aa38
MB		 1983 if (crypt_integrity_hmac(cc))
1984 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
1985
c0297721
AK		 1986 return err;
1987}
1988
c538f6ec
OK		 1989#ifdef CONFIG_KEYS
1990
027c431c
OK		 1991static bool contains_whitespace(const char *str)
1992{
1993 while (*str)
1994 if (isspace(*str++))
1995 return true;
1996 return false;
1997}
1998
c538f6ec
OK		 1999static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2000{
2001 char *new_key_string, *key_desc;
2002 int ret;
2003 struct key *key;
2004 const struct user_key_payload *ukp;
2005
027c431c
OK		 2006 /*
2007 * Reject key_string with whitespace. dm core currently lacks code for
2008 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2009 */
2010 if (contains_whitespace(key_string)) {
2011 DMERR("whitespace chars not allowed in key string");
2012 return -EINVAL;
2013 }
2014
c538f6ec
OK		 2015 /* look for next ':' separating key_type from key_description */
2016 key_desc = strpbrk(key_string, ":");
2017 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2018 return -EINVAL;
2019
2020 if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
2021 strncmp(key_string, "user:", key_desc - key_string + 1))
2022 return -EINVAL;
2023
2024 new_key_string = kstrdup(key_string, GFP_KERNEL);
2025 if (!new_key_string)
2026 return -ENOMEM;
2027
2028 key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
2029 key_desc + 1, NULL);
2030 if (IS_ERR(key)) {
2031 kzfree(new_key_string);
2032 return PTR_ERR(key);
2033 }
2034
f5b0cba8 2035 down_read(&key->sem);
c538f6ec 2036
0837e49a 2037 ukp = user_key_payload_locked(key);
c538f6ec 2038 if (!ukp) {
f5b0cba8 2039 up_read(&key->sem);
c538f6ec
OK		 2040 key_put(key);
2041 kzfree(new_key_string);
2042 return -EKEYREVOKED;
2043 }
2044
2045 if (cc->key_size != ukp->datalen) {
f5b0cba8 2046 up_read(&key->sem);
c538f6ec
OK		 2047 key_put(key);
2048 kzfree(new_key_string);
2049 return -EINVAL;
2050 }
2051
2052 memcpy(cc->key, ukp->data, cc->key_size);
2053
f5b0cba8 2054 up_read(&key->sem);
c538f6ec
OK		 2055 key_put(key);
2056
2057 /* clear the flag since following operations may invalidate previously valid key */
2058 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2059
2060 ret = crypt_setkey(cc);
2061
2062 /* wipe the kernel key payload copy in each case */
2063 memset(cc->key, 0, cc->key_size * sizeof(u8));
2064
2065 if (!ret) {
2066 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2067 kzfree(cc->key_string);
2068 cc->key_string = new_key_string;
2069 } else
2070 kzfree(new_key_string);
2071
2072 return ret;
2073}
2074
2075static int get_key_size(char **key_string)
2076{
2077 char *colon, dummy;
2078 int ret;
2079
2080 if (*key_string[0] != ':')
2081 return strlen(*key_string) >> 1;
2082
2083 /* look for next ':' in key string */
2084 colon = strpbrk(*key_string + 1, ":");
2085 if (!colon)
2086 return -EINVAL;
2087
2088 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2089 return -EINVAL;
2090
2091 *key_string = colon;
2092
2093 /* remaining key string should be :<logon|user>:<key_desc> */
2094
2095 return ret;
2096}
2097
2098#else
2099
2100static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2101{
2102 return -EINVAL;
2103}
2104
2105static int get_key_size(char **key_string)
2106{
2107 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2108}
2109
2110#endif
2111
e48d4bbf
MB		 2112static int crypt_set_key(struct crypt_config *cc, char *key)
2113{
de8be5ac
MB		 2114 int r = -EINVAL;
2115 int key_string_len = strlen(key);
2116
69a8cfcd
MB		 2117 /* Hyphen (which gives a key_size of zero) means there is no key. */
2118 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2119 goto out;
e48d4bbf 2120
c538f6ec
OK		 2121 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2122 if (key[0] == ':') {
2123 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2124 goto out;
c538f6ec 2125 }
e48d4bbf 2126
265e9098
OK		 2127 /* clear the flag since following operations may invalidate previously valid key */
2128 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2129
c538f6ec
OK		 2130 /* wipe references to any kernel keyring key */
2131 kzfree(cc->key_string);
2132 cc->key_string = NULL;
2133
69a8cfcd 2134 if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
de8be5ac 2135 goto out;
e48d4bbf 2136
671ea6b4 2137 r = crypt_setkey(cc);
265e9098
OK		 2138 if (!r)
2139 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2140
2141out:
2142 /* Hex key string not needed after here, so wipe it. */
2143 memset(key, '0', key_string_len);
2144
2145 return r;
e48d4bbf
MB		 2146}
2147
2148static int crypt_wipe_key(struct crypt_config *cc)
2149{
2150 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2151 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c538f6ec
OK		 2152 kzfree(cc->key_string);
2153 cc->key_string = NULL;
c0297721 2154
671ea6b4 2155 return crypt_setkey(cc);
e48d4bbf
MB		 2156}
2157
28513fcc
MB		 2158static void crypt_dtr(struct dm_target *ti)
2159{
2160 struct crypt_config *cc = ti->private;
2161
2162 ti->private = NULL;
2163
2164 if (!cc)
2165 return;
2166
f659b100 2167 if (cc->write_thread)
dc267621
MP		 2168 kthread_stop(cc->write_thread);
2169
28513fcc
MB		 2170 if (cc->io_queue)
2171 destroy_workqueue(cc->io_queue);
2172 if (cc->crypt_queue)
2173 destroy_workqueue(cc->crypt_queue);
2174
fd2d231f
MP		 2175 crypt_free_tfms(cc);
2176
28513fcc
MB		 2177 if (cc->bs)
2178 bioset_free(cc->bs);
2179
6f65985e
JL		 2180 mempool_destroy(cc->page_pool);
2181 mempool_destroy(cc->req_pool);
ef43aa38 2182 mempool_destroy(cc->tag_pool);
28513fcc
MB		 2183
2184 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2185 cc->iv_gen_ops->dtr(cc);
2186
28513fcc
MB		 2187 if (cc->dev)
2188 dm_put_device(ti, cc->dev);
2189
5ebaee6d 2190 kzfree(cc->cipher);
7dbcd137 2191 kzfree(cc->cipher_string);
c538f6ec 2192 kzfree(cc->key_string);
ef43aa38
MB		 2193 kzfree(cc->cipher_auth);
2194 kzfree(cc->authenc_key);
28513fcc
MB		 2195
2196 /* Must zero key material before freeing */
2197 kzfree(cc);
2198}
2199
e889f97a
MB		 2200static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2201{
2202 struct crypt_config *cc = ti->private;
2203
33d2f09f 2204 if (crypt_integrity_aead(cc))
e889f97a
MB		 2205 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2206 else
2207 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2208
e889f97a
MB		 2209 if (cc->iv_size)
2210 /* at least a 64 bit sector number should fit in our buffer */
2211 cc->iv_size = max(cc->iv_size,
2212 (unsigned int)(sizeof(u64) / sizeof(u8)));
2213 else if (ivmode) {
2214 DMWARN("Selected cipher does not support IVs");
2215 ivmode = NULL;
2216 }
2217
2218 /* Choose ivmode, see comments at iv code. */
2219 if (ivmode == NULL)
2220 cc->iv_gen_ops = NULL;
2221 else if (strcmp(ivmode, "plain") == 0)
2222 cc->iv_gen_ops = &crypt_iv_plain_ops;
2223 else if (strcmp(ivmode, "plain64") == 0)
2224 cc->iv_gen_ops = &crypt_iv_plain64_ops;
2225 else if (strcmp(ivmode, "essiv") == 0)
2226 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2227 else if (strcmp(ivmode, "benbi") == 0)
2228 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2229 else if (strcmp(ivmode, "null") == 0)
2230 cc->iv_gen_ops = &crypt_iv_null_ops;
2231 else if (strcmp(ivmode, "lmk") == 0) {
2232 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2233 /*
2234 * Version 2 and 3 is recognised according
2235 * to length of provided multi-key string.
2236 * If present (version 3), last key is used as IV seed.
2237 * All keys (including IV seed) are always the same size.
2238 */
2239 if (cc->key_size % cc->key_parts) {
2240 cc->key_parts++;
2241 cc->key_extra_size = cc->key_size / cc->key_parts;
2242 }
2243 } else if (strcmp(ivmode, "tcw") == 0) {
2244 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2245 cc->key_parts += 2; /* IV + whitening */
2246 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2247 } else if (strcmp(ivmode, "random") == 0) {
2248 cc->iv_gen_ops = &crypt_iv_random_ops;
2249 /* Need storage space in integrity fields. */
2250 cc->integrity_iv_size = cc->iv_size;
2251 } else {
2252 ti->error = "Invalid IV mode";
2253 return -EINVAL;
2254 }
2255
2256 return 0;
2257}
2258
33d2f09f
MB		 2259/*
2260 * Workaround to parse cipher algorithm from crypto API spec.
2261 * The cc->cipher is currently used only in ESSIV.
2262 * This should be probably done by crypto-api calls (once available...)
2263 */
2264static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2265{
2266 const char *alg_name = NULL;
2267 char *start, *end;
2268
2269 if (crypt_integrity_aead(cc)) {
2270 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2271 if (!alg_name)
2272 return -EINVAL;
2273 if (crypt_integrity_hmac(cc)) {
2274 alg_name = strchr(alg_name, ',');
2275 if (!alg_name)
2276 return -EINVAL;
2277 }
2278 alg_name++;
2279 } else {
2280 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2281 if (!alg_name)
2282 return -EINVAL;
2283 }
2284
2285 start = strchr(alg_name, '(');
2286 end = strchr(alg_name, ')');
2287
2288 if (!start && !end) {
2289 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2290 return cc->cipher ? 0 : -ENOMEM;
2291 }
2292
2293 if (!start || !end || ++start >= end)
2294 return -EINVAL;
2295
2296 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2297 if (!cc->cipher)
2298 return -ENOMEM;
2299
2300 strncpy(cc->cipher, start, end - start);
2301
2302 return 0;
2303}
2304
2305/*
2306 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2307 * The HMAC is needed to calculate tag size (HMAC digest size).
2308 * This should be probably done by crypto-api calls (once available...)
2309 */
2310static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2311{
2312 char *start, *end, *mac_alg = NULL;
2313 struct crypto_ahash *mac;
2314
2315 if (!strstarts(cipher_api, "authenc("))
2316 return 0;
2317
2318 start = strchr(cipher_api, '(');
2319 end = strchr(cipher_api, ',');
2320 if (!start || !end || ++start > end)
2321 return -EINVAL;
2322
2323 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2324 if (!mac_alg)
2325 return -ENOMEM;
2326 strncpy(mac_alg, start, end - start);
2327
2328 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2329 kfree(mac_alg);
2330
2331 if (IS_ERR(mac))
2332 return PTR_ERR(mac);
2333
2334 cc->key_mac_size = crypto_ahash_digestsize(mac);
2335 crypto_free_ahash(mac);
2336
2337 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2338 if (!cc->authenc_key)
2339 return -ENOMEM;
2340
2341 return 0;
2342}
2343
2344static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2345 char **ivmode, char **ivopts)
2346{
2347 struct crypt_config *cc = ti->private;
2348 char *tmp, *cipher_api;
2349 int ret = -EINVAL;
2350
2351 cc->tfms_count = 1;
2352
2353 /*
2354 * New format (capi: prefix)
2355 * capi:cipher_api_spec-iv:ivopts
2356 */
2357 tmp = &cipher_in[strlen("capi:")];
2358 cipher_api = strsep(&tmp, "-");
2359 *ivmode = strsep(&tmp, ":");
2360 *ivopts = tmp;
2361
2362 if (*ivmode && !strcmp(*ivmode, "lmk"))
2363 cc->tfms_count = 64;
2364
2365 cc->key_parts = cc->tfms_count;
2366
2367 /* Allocate cipher */
2368 ret = crypt_alloc_tfms(cc, cipher_api);
2369 if (ret < 0) {
2370 ti->error = "Error allocating crypto tfm";
2371 return ret;
2372 }
2373
2374 /* Alloc AEAD, can be used only in new format. */
2375 if (crypt_integrity_aead(cc)) {
2376 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2377 if (ret < 0) {
2378 ti->error = "Invalid AEAD cipher spec";
2379 return -ENOMEM;
2380 }
2381 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2382 } else
2383 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2384
2385 ret = crypt_ctr_blkdev_cipher(cc);
2386 if (ret < 0) {
2387 ti->error = "Cannot allocate cipher string";
2388 return -ENOMEM;
2389 }
2390
2391 return 0;
2392}
2393
2394static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2395 char **ivmode, char **ivopts)
1da177e4 2396{
5ebaee6d 2397 struct crypt_config *cc = ti->private;
33d2f09f 2398 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2399 char *cipher_api = NULL;
fd2d231f 2400 int ret = -EINVAL;
31998ef1 2401 char dummy;
1da177e4 2402
33d2f09f 2403 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2404 ti->error = "Bad cipher specification";
1da177e4
LT		 2405 return -EINVAL;
2406 }
2407
5ebaee6d
MB		 2408 /*
2409 * Legacy dm-crypt cipher specification
d1f96423 2410 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2411 */
2412 tmp = cipher_in;
d1f96423
MB		 2413 keycount = strsep(&tmp, "-");
2414 cipher = strsep(&keycount, ":");
2415
2416 if (!keycount)
2417 cc->tfms_count = 1;
31998ef1 2418 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2419 !is_power_of_2(cc->tfms_count)) {
2420 ti->error = "Bad cipher key count specification";
2421 return -EINVAL;
2422 }
2423 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2424
2425 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2426 if (!cc->cipher)
2427 goto bad_mem;
2428
1da177e4 2429 chainmode = strsep(&tmp, "-");
33d2f09f
MB		 2430 *ivopts = strsep(&tmp, "-");
2431 *ivmode = strsep(&*ivopts, ":");
1da177e4
LT		 2432
2433 if (tmp)
5ebaee6d 2434 DMWARN("Ignoring unexpected additional cipher options");
1da177e4 2435
7dbcd137
MB		 2436 /*
2437 * For compatibility with the original dm-crypt mapping format, if
2438 * only the cipher name is supplied, use cbc-plain.
2439 */
33d2f09f 2440 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2441 chainmode = "cbc";
33d2f09f 2442 *ivmode = "plain";
1da177e4
LT		 2443 }
2444
33d2f09f 2445 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2446 ti->error = "IV mechanism required";
2447 return -EINVAL;
1da177e4
LT		 2448 }
2449
5ebaee6d
MB		 2450 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2451 if (!cipher_api)
2452 goto bad_mem;
2453
2454 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2455 "%s(%s)", chainmode, cipher);
2456 if (ret < 0) {
2457 kfree(cipher_api);
2458 goto bad_mem;
1da177e4
LT		 2459 }
2460
5ebaee6d 2461 /* Allocate cipher */
fd2d231f
MP		 2462 ret = crypt_alloc_tfms(cc, cipher_api);
2463 if (ret < 0) {
2464 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2465 kfree(cipher_api);
2466 return ret;
2467 }
2468
2469 return 0;
2470bad_mem:
2471 ti->error = "Cannot allocate cipher strings";
2472 return -ENOMEM;
2473}
2474
2475static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2476{
2477 struct crypt_config *cc = ti->private;
2478 char *ivmode = NULL, *ivopts = NULL;
2479 int ret;
2480
2481 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2482 if (!cc->cipher_string) {
2483 ti->error = "Cannot allocate cipher strings";
2484 return -ENOMEM;
1da177e4 2485 }
1da177e4 2486
33d2f09f
MB		 2487 if (strstarts(cipher_in, "capi:"))
2488 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2489 else
2490 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2491 if (ret)
2492 return ret;
2493
5ebaee6d 2494 /* Initialize IV */
e889f97a
MB		 2495 ret = crypt_ctr_ivmode(ti, ivmode);
2496 if (ret < 0)
33d2f09f 2497 return ret;
1da177e4 2498
da31a078
MB		 2499 /* Initialize and set key */
2500 ret = crypt_set_key(cc, key);
2501 if (ret < 0) {
2502 ti->error = "Error decoding and setting key";
33d2f09f 2503 return ret;
da31a078
MB		 2504 }
2505
28513fcc
MB		 2506 /* Allocate IV */
2507 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2508 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2509 if (ret < 0) {
2510 ti->error = "Error creating IV";
33d2f09f 2511 return ret;
28513fcc
MB		 2512 }
2513 }
1da177e4 2514
28513fcc
MB		 2515 /* Initialize IV (set keys for ESSIV etc) */
2516 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2517 ret = cc->iv_gen_ops->init(cc);
2518 if (ret < 0) {
2519 ti->error = "Error initialising IV";
33d2f09f 2520 return ret;
28513fcc 2521 }
b95bf2d3
MB		 2522 }
2523
5ebaee6d 2524 return ret;
5ebaee6d
MB		 2525}
2526
ef43aa38
MB		 2527static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2528{
2529 struct crypt_config *cc = ti->private;
2530 struct dm_arg_set as;
2531 static struct dm_arg _args[] = {
8f0009a2 2532 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2533 };
2534 unsigned int opt_params, val;
2535 const char *opt_string, *sval;
8f0009a2 2536 char dummy;
ef43aa38
MB		 2537 int ret;
2538
2539 /* Optional parameters */
2540 as.argc = argc;
2541 as.argv = argv;
2542
2543 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2544 if (ret)
2545 return ret;
2546
2547 while (opt_params--) {
2548 opt_string = dm_shift_arg(&as);
2549 if (!opt_string) {
2550 ti->error = "Not enough feature arguments";
2551 return -EINVAL;
2552 }
2553
2554 if (!strcasecmp(opt_string, "allow_discards"))
2555 ti->num_discard_bios = 1;
2556
2557 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2558 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2559
2560 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2561 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2562 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2563 if (val == 0 || val > MAX_TAG_SIZE) {
2564 ti->error = "Invalid integrity arguments";
2565 return -EINVAL;
2566 }
2567 cc->on_disk_tag_size = val;
2568 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2569 if (!strcasecmp(sval, "aead")) {
2570 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2571 } else if (strcasecmp(sval, "none")) {
2572 ti->error = "Unknown integrity profile";
2573 return -EINVAL;
2574 }
2575
2576 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2577 if (!cc->cipher_auth)
2578 return -ENOMEM;
ff3af92b 2579 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2580 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2581 cc->sector_size > 4096 ||
ff3af92b 2582 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2583 ti->error = "Invalid feature value for sector_size";
2584 return -EINVAL;
2585 }
ff3af92b 2586 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2587 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2588 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2589 else {
ef43aa38
MB		 2590 ti->error = "Invalid feature arguments";
2591 return -EINVAL;
2592 }
2593 }
2594
2595 return 0;
2596}
2597
5ebaee6d
MB		 2598/*
2599 * Construct an encryption mapping:
c538f6ec 2600 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2601 */
2602static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2603{
2604 struct crypt_config *cc;
c538f6ec 2605 int key_size;
ef43aa38 2606 unsigned int align_mask;
5ebaee6d
MB		 2607 unsigned long long tmpll;
2608 int ret;
ef43aa38 2609 size_t iv_size_padding, additional_req_size;
31998ef1 2610 char dummy;
772ae5f5 2611
772ae5f5 2612 if (argc < 5) {
5ebaee6d
MB		 2613 ti->error = "Not enough arguments";
2614 return -EINVAL;
1da177e4
LT		 2615 }
2616
c538f6ec
OK		 2617 key_size = get_key_size(&argv[1]);
2618 if (key_size < 0) {
2619 ti->error = "Cannot parse key size";
2620 return -EINVAL;
2621 }
5ebaee6d
MB		 2622
2623 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2624 if (!cc) {
2625 ti->error = "Cannot allocate encryption context";
2626 return -ENOMEM;
2627 }
69a8cfcd 2628 cc->key_size = key_size;
8f0009a2 2629 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2630 cc->sector_shift = 0;
5ebaee6d
MB		 2631
2632 ti->private = cc;
ef43aa38
MB		 2633
2634 /* Optional parameters need to be read before cipher constructor */
2635 if (argc > 5) {
2636 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2637 if (ret)
2638 goto bad;
2639 }
2640
5ebaee6d
MB		 2641 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2642 if (ret < 0)
2643 goto bad;
2644
33d2f09f 2645 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2646 cc->dmreq_start = sizeof(struct aead_request);
2647 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2648 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2649 } else {
2650 cc->dmreq_start = sizeof(struct skcipher_request);
2651 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2652 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2653 }
d49ec52f
MP		 2654 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2655
ef43aa38 2656 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2657 /* Allocate the padding exactly */
2658 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2659 & align_mask;
d49ec52f
MP		 2660 } else {
2661 /*
2662 * If the cipher requires greater alignment than kmalloc
2663 * alignment, we don't know the exact position of the
2664 * initialization vector. We must assume worst case.
2665 */
ef43aa38 2666 iv_size_padding = align_mask;
d49ec52f 2667 }
ddd42edf 2668
94f5e024 2669 ret = -ENOMEM;
ef43aa38
MB		 2670
2671 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2672 additional_req_size = sizeof(struct dm_crypt_request) +
2673 iv_size_padding + cc->iv_size +
2674 cc->iv_size +
2675 sizeof(uint64_t) +
2676 sizeof(unsigned int);
2677
2678 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size);
ddd42edf
MB		 2679 if (!cc->req_pool) {
2680 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2681 goto bad;
ddd42edf 2682 }
ddd42edf 2683
30187e1d 2684 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2685 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2686 ARCH_KMALLOC_MINALIGN);
298a9fa0 2687
cf2f1abf 2688 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
1da177e4 2689 if (!cc->page_pool) {
72d94861 2690 ti->error = "Cannot allocate page mempool";
28513fcc 2691 goto bad;
1da177e4
LT		 2692 }
2693
bb799ca0 2694 cc->bs = bioset_create(MIN_IOS, 0);
6a24c718
MB		 2695 if (!cc->bs) {
2696 ti->error = "Cannot allocate crypt bioset";
28513fcc 2697 goto bad;
6a24c718
MB		 2698 }
2699
7145c241
MP		 2700 mutex_init(&cc->bio_alloc_lock);
2701
28513fcc 2702 ret = -EINVAL;
8f0009a2
MB		 2703 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2704 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2705 ti->error = "Invalid iv_offset sector";
28513fcc 2706 goto bad;
1da177e4 2707 }
4ee218cd 2708 cc->iv_offset = tmpll;
1da177e4 2709
e80d1c80
VG		 2710 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2711 if (ret) {
28513fcc
MB		 2712 ti->error = "Device lookup failed";
2713 goto bad;
2714 }
2715
e80d1c80 2716 ret = -EINVAL;
31998ef1 2717 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
72d94861 2718 ti->error = "Invalid device sector";
28513fcc 2719 goto bad;
1da177e4 2720 }
4ee218cd 2721 cc->start = tmpll;
1da177e4 2722
33d2f09f 2723 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2724 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2725 if (ret)
2726 goto bad;
2727
ef43aa38
MB		 2728 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2729 if (!cc->tag_pool_max_sectors)
2730 cc->tag_pool_max_sectors = 1;
f3396c58 2731
ef43aa38
MB		 2732 cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS,
2733 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
2734 if (!cc->tag_pool) {
2735 ti->error = "Cannot allocate integrity tags mempool";
2736 goto bad;
772ae5f5
MB		 2737 }
2738 }
2739
28513fcc 2740 ret = -ENOMEM;
670368a8 2741 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
cabf08e4
MB		 2742 if (!cc->io_queue) {
2743 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2744 goto bad;
cabf08e4
MB		 2745 }
2746
f3396c58
MP		 2747 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2748 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
2749 else
2750 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
2751 num_online_cpus());
cabf08e4 2752 if (!cc->crypt_queue) {
9934a8be 2753 ti->error = "Couldn't create kcryptd queue";
28513fcc 2754 goto bad;
9934a8be
MB		 2755 }
2756
dc267621 2757 init_waitqueue_head(&cc->write_thread_wait);
b3c5fd30 2758 cc->write_tree = RB_ROOT;
dc267621
MP		 2759
2760 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
2761 if (IS_ERR(cc->write_thread)) {
2762 ret = PTR_ERR(cc->write_thread);
2763 cc->write_thread = NULL;
2764 ti->error = "Couldn't spawn write thread";
2765 goto bad;
2766 }
2767 wake_up_process(cc->write_thread);
2768
55a62eef 2769 ti->num_flush_bios = 1;
0ac55489 2770 ti->discard_zeroes_data_unsupported = true;
983c7db3 2771
1da177e4
LT		 2772 return 0;
2773
28513fcc
MB		 2774bad:
2775 crypt_dtr(ti);
2776 return ret;
1da177e4
LT		 2777}
2778
7de3ee57 2779static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2780{
028867ac 2781 struct dm_crypt_io *io;
49a8a920 2782 struct crypt_config *cc = ti->private;
647c7db1 2783
772ae5f5 2784 /*
28a8f0d3
MC		 2785 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2786 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2787 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2788 */
1eff9d32 2789 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2790 bio_op(bio) == REQ_OP_DISCARD)) {
647c7db1 2791 bio->bi_bdev = cc->dev->bdev;
772ae5f5 2792 if (bio_sectors(bio))
4f024f37
KO		 2793 bio->bi_iter.bi_sector = cc->start +
2794 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2795 return DM_MAPIO_REMAPPED;
2796 }
1da177e4 2797
4e870e94
MP		 2798 /*
2799 * Check if bio is too large, split as needed.
2800 */
2801 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2802 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2803 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2804
8f0009a2
MB		 2805 /*
2806 * Ensure that bio is a multiple of internal sector encryption size
2807 * and is aligned to this size as defined in IO hints.
2808 */
2809 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
2810 return -EIO;
2811
2812 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
2813 return -EIO;
2814
298a9fa0
MP		 2815 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2816 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2817
2818 if (cc->on_disk_tag_size) {
2819 unsigned tag_len = cc->on_disk_tag_size * bio_sectors(bio);
2820
2821 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
8f0009a2 2822 unlikely(!(io->integrity_metadata = kzalloc(tag_len,
ef43aa38
MB		 2823 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2824 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2825 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
2826 io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO);
2827 io->integrity_metadata_from_pool = true;
8f0009a2 2828 memset(io->integrity_metadata, 0, cc->tag_pool_max_sectors * (1 << SECTOR_SHIFT));
ef43aa38
MB		 2829 }
2830 }
2831
33d2f09f 2832 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2833 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2834 else
2835 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2836
20c82538
MB		 2837 if (bio_data_dir(io->base_bio) == READ) {
2838 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2839 kcryptd_queue_read(io);
20c82538 2840 } else
cabf08e4 2841 kcryptd_queue_crypt(io);
1da177e4 2842
d2a7ad29 2843 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2844}
2845
fd7c092e
MP		 2846static void crypt_status(struct dm_target *ti, status_type_t type,
2847 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2848{
5ebaee6d 2849 struct crypt_config *cc = ti->private;
fd7c092e 2850 unsigned i, sz = 0;
f3396c58 2851 int num_feature_args = 0;
1da177e4
LT		 2852
2853 switch (type) {
2854 case STATUSTYPE_INFO:
2855 result[0] = '\0';
2856 break;
2857
2858 case STATUSTYPE_TABLE:
7dbcd137 2859 DMEMIT("%s ", cc->cipher_string);
1da177e4 2860
c538f6ec
OK		 2861 if (cc->key_size > 0) {
2862 if (cc->key_string)
2863 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2864 else
2865 for (i = 0; i < cc->key_size; i++)
2866 DMEMIT("%02x", cc->key[i]);
2867 } else
fd7c092e 2868 DMEMIT("-");
1da177e4 2869
4ee218cd
AM		 2870 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2871 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2872
f3396c58
MP		 2873 num_feature_args += !!ti->num_discard_bios;
2874 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2875 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2876 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2877 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2878 if (cc->on_disk_tag_size)
2879 num_feature_args++;
f3396c58
MP		 2880 if (num_feature_args) {
2881 DMEMIT(" %d", num_feature_args);
2882 if (ti->num_discard_bios)
2883 DMEMIT(" allow_discards");
2884 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2885 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2886 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2887 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2888 if (cc->on_disk_tag_size)
2889 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2890 if (cc->sector_size != (1 << SECTOR_SHIFT))
2891 DMEMIT(" sector_size:%d", cc->sector_size);
2892 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2893 DMEMIT(" iv_large_sectors");
f3396c58 2894 }
772ae5f5 2895
1da177e4
LT		 2896 break;
2897 }
1da177e4
LT		 2898}
2899
e48d4bbf
MB		 2900static void crypt_postsuspend(struct dm_target *ti)
2901{
2902 struct crypt_config *cc = ti->private;
2903
2904 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2905}
2906
2907static int crypt_preresume(struct dm_target *ti)
2908{
2909 struct crypt_config *cc = ti->private;
2910
2911 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
2912 DMERR("aborting resume - crypt key is not set.");
2913 return -EAGAIN;
2914 }
2915
2916 return 0;
2917}
2918
2919static void crypt_resume(struct dm_target *ti)
2920{
2921 struct crypt_config *cc = ti->private;
2922
2923 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2924}
2925
2926/* Message interface
2927 * key set <key>
2928 * key wipe
2929 */
2930static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2931{
2932 struct crypt_config *cc = ti->private;
c538f6ec 2933 int key_size, ret = -EINVAL;
e48d4bbf
MB		 2934
2935 if (argc < 2)
2936 goto error;
2937
498f0103 2938 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 2939 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2940 DMWARN("not suspended during key manipulation.");
2941 return -EINVAL;
2942 }
498f0103 2943 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 2944 /* The key size may not be changed. */
2945 key_size = get_key_size(&argv[2]);
2946 if (key_size < 0 || cc->key_size != key_size) {
2947 memset(argv[2], '0', strlen(argv[2]));
2948 return -EINVAL;
2949 }
2950
542da317
MB		 2951 ret = crypt_set_key(cc, argv[2]);
2952 if (ret)
2953 return ret;
2954 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2955 ret = cc->iv_gen_ops->init(cc);
2956 return ret;
2957 }
498f0103 2958 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 2959 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2960 ret = cc->iv_gen_ops->wipe(cc);
2961 if (ret)
2962 return ret;
2963 }
e48d4bbf 2964 return crypt_wipe_key(cc);
542da317 2965 }
e48d4bbf
MB		 2966 }
2967
2968error:
2969 DMWARN("unrecognised message received.");
2970 return -EINVAL;
2971}
2972
af4874e0
MS		 2973static int crypt_iterate_devices(struct dm_target *ti,
2974 iterate_devices_callout_fn fn, void *data)
2975{
2976 struct crypt_config *cc = ti->private;
2977
5dea271b 2978 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 2979}
2980
586b286b
MS		 2981static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
2982{
8f0009a2
MB		 2983 struct crypt_config *cc = ti->private;
2984
586b286b
MS		 2985 /*
2986 * Unfortunate constraint that is required to avoid the potential
2987 * for exceeding underlying device's max_segments limits -- due to
2988 * crypt_alloc_buffer() possibly allocating pages for the encryption
2989 * bio that are not as physically contiguous as the original bio.
2990 */
2991 limits->max_segment_size = PAGE_SIZE;
8f0009a2
MB		 2992
2993 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
2994 limits->logical_block_size = cc->sector_size;
2995 limits->physical_block_size = cc->sector_size;
2996 blk_limits_io_min(limits, cc->sector_size);
2997 }
586b286b
MS		 2998}
2999
1da177e4
LT		 3000static struct target_type crypt_target = {
3001 .name = "crypt",
8f0009a2 3002 .version = {1, 17, 0},
1da177e4
LT		 3003 .module = THIS_MODULE,
3004 .ctr = crypt_ctr,
3005 .dtr = crypt_dtr,
3006 .map = crypt_map,
3007 .status = crypt_status,
e48d4bbf
MB		 3008 .postsuspend = crypt_postsuspend,
3009 .preresume = crypt_preresume,
3010 .resume = crypt_resume,
3011 .message = crypt_message,
af4874e0 3012 .iterate_devices = crypt_iterate_devices,
586b286b 3013 .io_hints = crypt_io_hints,
1da177e4
LT		 3014};
3015
3016static int __init dm_crypt_init(void)
3017{
3018 int r;
3019
1da177e4 3020 r = dm_register_target(&crypt_target);
94f5e024 3021 if (r < 0)
72d94861 3022 DMERR("register failed %d", r);
1da177e4 3023
1da177e4
LT		 3024 return r;
3025}
3026
3027static void __exit dm_crypt_exit(void)
3028{
10d3bd09 3029 dm_unregister_target(&crypt_target);
1da177e4
LT		 3030}
3031
3032module_init(dm_crypt_init);
3033module_exit(dm_crypt_exit);
3034
bf14299f 3035MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3036MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3037MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)