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md/raid5: fix a race condition in stripe batch
[mirror_ubuntu-artful-kernel.git] / drivers / md / dm-crypt.c
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1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
ef43aa38
MB		 4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 6 *
7 * This file is released under the GPL.
8 */
9
43d69034 10#include <linux/completion.h>
d1806f6a 11#include <linux/err.h>
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
c538f6ec 15#include <linux/key.h>
1da177e4
LT		 16#include <linux/bio.h>
17#include <linux/blkdev.h>
18#include <linux/mempool.h>
19#include <linux/slab.h>
20#include <linux/crypto.h>
21#include <linux/workqueue.h>
dc267621 22#include <linux/kthread.h>
3fcfab16 23#include <linux/backing-dev.h>
60063497 24#include <linux/atomic.h>
378f058c 25#include <linux/scatterlist.h>
b3c5fd30 26#include <linux/rbtree.h>
027c431c 27#include <linux/ctype.h>
1da177e4 28#include <asm/page.h>
48527fa7 29#include <asm/unaligned.h>
34745785
MB		 30#include <crypto/hash.h>
31#include <crypto/md5.h>
32#include <crypto/algapi.h>
bbdb23b5 33#include <crypto/skcipher.h>
ef43aa38
MB		 34#include <crypto/aead.h>
35#include <crypto/authenc.h>
36#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
c538f6ec 37#include <keys/user-type.h>
1da177e4 38
586e80e6 39#include <linux/device-mapper.h>
1da177e4 40
72d94861 41#define DM_MSG_PREFIX "crypt"
1da177e4 42
1da177e4
LT		 43/*
44 * context holding the current state of a multi-part conversion
45 */
46struct convert_context {
43d69034 47 struct completion restart;
1da177e4
LT		 48 struct bio *bio_in;
49 struct bio *bio_out;
003b5c57
KO		 50 struct bvec_iter iter_in;
51 struct bvec_iter iter_out;
c66029f4 52 sector_t cc_sector;
40b6229b 53 atomic_t cc_pending;
ef43aa38
MB		 54 union {
55 struct skcipher_request *req;
56 struct aead_request *req_aead;
57 } r;
58
1da177e4
LT		 59};
60
53017030
MB		 61/*
62 * per bio private data
63 */
64struct dm_crypt_io {
49a8a920 65 struct crypt_config *cc;
53017030 66 struct bio *base_bio;
ef43aa38
MB		 67 u8 *integrity_metadata;
68 bool integrity_metadata_from_pool;
53017030
MB		 69 struct work_struct work;
70
71 struct convert_context ctx;
72
40b6229b 73 atomic_t io_pending;
4e4cbee9 74 blk_status_t error;
0c395b0f 75 sector_t sector;
dc267621 76
b3c5fd30 77 struct rb_node rb_node;
298a9fa0 78} CRYPTO_MINALIGN_ATTR;
53017030 79
01482b76 80struct dm_crypt_request {
b2174eeb 81 struct convert_context *ctx;
ef43aa38
MB		 82 struct scatterlist sg_in[4];
83 struct scatterlist sg_out[4];
2dc5327d 84 sector_t iv_sector;
01482b76
MB		 85};
86
1da177e4
LT		 87struct crypt_config;
88
89struct crypt_iv_operations {
90 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 91 const char *opts);
1da177e4 92 void (*dtr)(struct crypt_config *cc);
b95bf2d3 93 int (*init)(struct crypt_config *cc);
542da317 94 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 95 int (*generator)(struct crypt_config *cc, u8 *iv,
96 struct dm_crypt_request *dmreq);
97 int (*post)(struct crypt_config *cc, u8 *iv,
98 struct dm_crypt_request *dmreq);
1da177e4
LT		 99};
100
60473592 101struct iv_essiv_private {
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 227/*
86f917ad 228 * Use this to access cipher attributes that are independent of the key.
c0297721 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 *
7e3fd855
MB		 249 * plain64be: the initial vector is the 64-bit big-endian version of the sector
250 * number, padded with zeros if necessary.
251 *
3c164bd8
RS		 252 * essiv: "encrypted sector|salt initial vector", the sector number is
253 * encrypted with the bulk cipher using a salt as key. The salt
254 * should be derived from the bulk cipher's key via hashing.
1da177e4 255 *
48527fa7
RS		 256 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
257 * (needed for LRW-32-AES and possible other narrow block modes)
258 *
46b47730
LN		 259 * null: the initial vector is always zero. Provides compatibility with
260 * obsolete loop_fish2 devices. Do not use for new devices.
261 *
34745785
MB		 262 * lmk: Compatible implementation of the block chaining mode used
263 * by the Loop-AES block device encryption system
264 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
265 * It operates on full 512 byte sectors and uses CBC
266 * with an IV derived from the sector number, the data and
267 * optionally extra IV seed.
268 * This means that after decryption the first block
269 * of sector must be tweaked according to decrypted data.
270 * Loop-AES can use three encryption schemes:
271 * version 1: is plain aes-cbc mode
272 * version 2: uses 64 multikey scheme with lmk IV generator
273 * version 3: the same as version 2 with additional IV seed
274 * (it uses 65 keys, last key is used as IV seed)
275 *
ed04d981
MB		 276 * tcw: Compatible implementation of the block chaining mode used
277 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 278 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 279 * It operates on full 512 byte sectors and uses CBC
280 * with an IV derived from initial key and the sector number.
281 * In addition, whitening value is applied on every sector, whitening
282 * is calculated from initial key, sector number and mixed using CRC32.
283 * Note that this encryption scheme is vulnerable to watermarking attacks
284 * and should be used for old compatible containers access only.
285 *
1da177e4
LT		 286 * plumb: unimplemented, see:
287 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
288 */
289
2dc5327d
MB		 290static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
291 struct dm_crypt_request *dmreq)
1da177e4
LT		 292{
293 memset(iv, 0, cc->iv_size);
283a8328 294 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 295
296 return 0;
297}
298
61afef61 299static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 300 struct dm_crypt_request *dmreq)
61afef61
MB		 301{
302 memset(iv, 0, cc->iv_size);
283a8328 303 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 304
305 return 0;
306}
307
7e3fd855
MB		 308static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv,
309 struct dm_crypt_request *dmreq)
310{
311 memset(iv, 0, cc->iv_size);
312 /* iv_size is at least of size u64; usually it is 16 bytes */
313 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector);
314
315 return 0;
316}
317
b95bf2d3
MB		 318/* Initialise ESSIV - compute salt but no local memory allocations */
319static int crypt_iv_essiv_init(struct crypt_config *cc)
320{
321 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 322 AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm);
b95bf2d3 323 struct scatterlist sg;
c0297721 324 struct crypto_cipher *essiv_tfm;
fd2d231f 325 int err;
b95bf2d3
MB		 326
327 sg_init_one(&sg, cc->key, cc->key_size);
bbdb23b5
HX		 328 ahash_request_set_tfm(req, essiv->hash_tfm);
329 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
330 ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size);
b95bf2d3 331
bbdb23b5
HX		 332 err = crypto_ahash_digest(req);
333 ahash_request_zero(req);
b95bf2d3
MB		 334 if (err)
335 return err;
336
fd2d231f 337 essiv_tfm = cc->iv_private;
c0297721 338
fd2d231f 339 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
bbdb23b5 340 crypto_ahash_digestsize(essiv->hash_tfm));
fd2d231f
MP		 341 if (err)
342 return err;
c0297721
AK		 343
344 return 0;
b95bf2d3
MB		 345}
346
542da317
MB		 347/* Wipe salt and reset key derived from volume key */
348static int crypt_iv_essiv_wipe(struct crypt_config *cc)
349{
350 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 351 unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm);
c0297721 352 struct crypto_cipher *essiv_tfm;
fd2d231f 353 int r, err = 0;
542da317
MB		 354
355 memset(essiv->salt, 0, salt_size);
356
fd2d231f
MP		 357 essiv_tfm = cc->iv_private;
358 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
359 if (r)
360 err = r;
c0297721
AK		 361
362 return err;
363}
364
86f917ad
EB		 365/* Allocate the cipher for ESSIV */
366static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc,
367 struct dm_target *ti,
368 const u8 *salt,
369 unsigned int saltsize)
c0297721
AK		 370{
371 struct crypto_cipher *essiv_tfm;
372 int err;
373
374 /* Setup the essiv_tfm with the given salt */
375 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
376 if (IS_ERR(essiv_tfm)) {
377 ti->error = "Error allocating crypto tfm for ESSIV";
378 return essiv_tfm;
379 }
380
ef43aa38 381 if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) {
c0297721
AK		 382 ti->error = "Block size of ESSIV cipher does "
383 "not match IV size of block cipher";
384 crypto_free_cipher(essiv_tfm);
385 return ERR_PTR(-EINVAL);
386 }
387
388 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
389 if (err) {
390 ti->error = "Failed to set key for ESSIV cipher";
391 crypto_free_cipher(essiv_tfm);
392 return ERR_PTR(err);
393 }
394
395 return essiv_tfm;
542da317
MB		 396}
397
60473592
MB		 398static void crypt_iv_essiv_dtr(struct crypt_config *cc)
399{
c0297721 400 struct crypto_cipher *essiv_tfm;
60473592
MB		 401 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
402
bbdb23b5 403 crypto_free_ahash(essiv->hash_tfm);
b95bf2d3
MB		 404 essiv->hash_tfm = NULL;
405
406 kzfree(essiv->salt);
407 essiv->salt = NULL;
c0297721 408
fd2d231f 409 essiv_tfm = cc->iv_private;
c0297721 410
fd2d231f
MP		 411 if (essiv_tfm)
412 crypto_free_cipher(essiv_tfm);
c0297721 413
fd2d231f 414 cc->iv_private = NULL;
60473592
MB		 415}
416
1da177e4 417static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
d469f841 418 const char *opts)
1da177e4 419{
5861f1be 420 struct crypto_cipher *essiv_tfm = NULL;
bbdb23b5 421 struct crypto_ahash *hash_tfm = NULL;
5861f1be 422 u8 *salt = NULL;
fd2d231f 423 int err;
1da177e4 424
5861f1be 425 if (!opts) {
72d94861 426 ti->error = "Digest algorithm missing for ESSIV mode";
1da177e4
LT		 427 return -EINVAL;
428 }
429
b95bf2d3 430 /* Allocate hash algorithm */
bbdb23b5 431 hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC);
35058687 432 if (IS_ERR(hash_tfm)) {
72d94861 433 ti->error = "Error initializing ESSIV hash";
5861f1be
MB		 434 err = PTR_ERR(hash_tfm);
435 goto bad;
1da177e4
LT		 436 }
437
bbdb23b5 438 salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL);
5861f1be 439 if (!salt) {
72d94861 440 ti->error = "Error kmallocing salt storage in ESSIV";
5861f1be
MB		 441 err = -ENOMEM;
442 goto bad;
1da177e4
LT		 443 }
444
b95bf2d3 445 cc->iv_gen_private.essiv.salt = salt;
b95bf2d3
MB		 446 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
447
86f917ad
EB		 448 essiv_tfm = alloc_essiv_cipher(cc, ti, salt,
449 crypto_ahash_digestsize(hash_tfm));
fd2d231f
MP		 450 if (IS_ERR(essiv_tfm)) {
451 crypt_iv_essiv_dtr(cc);
452 return PTR_ERR(essiv_tfm);
c0297721 453 }
fd2d231f 454 cc->iv_private = essiv_tfm;
c0297721 455
1da177e4 456 return 0;
5861f1be
MB		 457
458bad:
5861f1be 459 if (hash_tfm && !IS_ERR(hash_tfm))
bbdb23b5 460 crypto_free_ahash(hash_tfm);
b95bf2d3 461 kfree(salt);
5861f1be 462 return err;
1da177e4
LT		 463}
464
2dc5327d
MB		 465static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
466 struct dm_crypt_request *dmreq)
1da177e4 467{
fd2d231f 468 struct crypto_cipher *essiv_tfm = cc->iv_private;
c0297721 469
1da177e4 470 memset(iv, 0, cc->iv_size);
283a8328 471 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721
AK		 472 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
473
1da177e4
LT		 474 return 0;
475}
476
48527fa7
RS		 477static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
478 const char *opts)
479{
bbdb23b5 480 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
f0d1b0b3 481 int log = ilog2(bs);
48527fa7
RS		 482
483 /* we need to calculate how far we must shift the sector count
484 * to get the cipher block count, we use this shift in _gen */
485
486 if (1 << log != bs) {
487 ti->error = "cypher blocksize is not a power of 2";
488 return -EINVAL;
489 }
490
491 if (log > 9) {
492 ti->error = "cypher blocksize is > 512";
493 return -EINVAL;
494 }
495
60473592 496 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 497
498 return 0;
499}
500
501static void crypt_iv_benbi_dtr(struct crypt_config *cc)
502{
48527fa7
RS		 503}
504
2dc5327d
MB		 505static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
506 struct dm_crypt_request *dmreq)
48527fa7 507{
79066ad3
HX		 508 __be64 val;
509
48527fa7 510 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 511
2dc5327d 512 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 513 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 514
1da177e4
LT		 515 return 0;
516}
517
2dc5327d
MB		 518static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
519 struct dm_crypt_request *dmreq)
46b47730
LN		 520{
521 memset(iv, 0, cc->iv_size);
522
523 return 0;
524}
525
34745785
MB		 526static void crypt_iv_lmk_dtr(struct crypt_config *cc)
527{
528 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
529
530 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
531 crypto_free_shash(lmk->hash_tfm);
532 lmk->hash_tfm = NULL;
533
534 kzfree(lmk->seed);
535 lmk->seed = NULL;
536}
537
538static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
539 const char *opts)
540{
541 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
542
8f0009a2
MB		 543 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
544 ti->error = "Unsupported sector size for LMK";
545 return -EINVAL;
546 }
547
34745785
MB		 548 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
549 if (IS_ERR(lmk->hash_tfm)) {
550 ti->error = "Error initializing LMK hash";
551 return PTR_ERR(lmk->hash_tfm);
552 }
553
554 /* No seed in LMK version 2 */
555 if (cc->key_parts == cc->tfms_count) {
556 lmk->seed = NULL;
557 return 0;
558 }
559
560 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
561 if (!lmk->seed) {
562 crypt_iv_lmk_dtr(cc);
563 ti->error = "Error kmallocing seed storage in LMK";
564 return -ENOMEM;
565 }
566
567 return 0;
568}
569
570static int crypt_iv_lmk_init(struct crypt_config *cc)
571{
572 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
573 int subkey_size = cc->key_size / cc->key_parts;
574
575 /* LMK seed is on the position of LMK_KEYS + 1 key */
576 if (lmk->seed)
577 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
578 crypto_shash_digestsize(lmk->hash_tfm));
579
580 return 0;
581}
582
583static int crypt_iv_lmk_wipe(struct crypt_config *cc)
584{
585 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
586
587 if (lmk->seed)
588 memset(lmk->seed, 0, LMK_SEED_SIZE);
589
590 return 0;
591}
592
593static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
594 struct dm_crypt_request *dmreq,
595 u8 *data)
596{
597 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 598 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 599 struct md5_state md5state;
da31a078 600 __le32 buf[4];
34745785
MB		 601 int i, r;
602
b6106265
JSM		 603 desc->tfm = lmk->hash_tfm;
604 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
34745785 605
b6106265 606 r = crypto_shash_init(desc);
34745785
MB		 607 if (r)
608 return r;
609
610 if (lmk->seed) {
b6106265 611 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 612 if (r)
613 return r;
614 }
615
616 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 617 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 618 if (r)
619 return r;
620
621 /* Sector is cropped to 56 bits here */
622 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
623 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
624 buf[2] = cpu_to_le32(4024);
625 buf[3] = 0;
b6106265 626 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 627 if (r)
628 return r;
629
630 /* No MD5 padding here */
b6106265 631 r = crypto_shash_export(desc, &md5state);
34745785
MB		 632 if (r)
633 return r;
634
635 for (i = 0; i < MD5_HASH_WORDS; i++)
636 __cpu_to_le32s(&md5state.hash[i]);
637 memcpy(iv, &md5state.hash, cc->iv_size);
638
639 return 0;
640}
641
642static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
643 struct dm_crypt_request *dmreq)
644{
ef43aa38 645 struct scatterlist *sg;
34745785
MB		 646 u8 *src;
647 int r = 0;
648
649 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 650 sg = crypt_get_sg_data(cc, dmreq->sg_in);
651 src = kmap_atomic(sg_page(sg));
652 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 653 kunmap_atomic(src);
34745785
MB		 654 } else
655 memset(iv, 0, cc->iv_size);
656
657 return r;
658}
659
660static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
661 struct dm_crypt_request *dmreq)
662{
ef43aa38 663 struct scatterlist *sg;
34745785
MB		 664 u8 *dst;
665 int r;
666
667 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
668 return 0;
669
ef43aa38
MB		 670 sg = crypt_get_sg_data(cc, dmreq->sg_out);
671 dst = kmap_atomic(sg_page(sg));
672 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 673
674 /* Tweak the first block of plaintext sector */
675 if (!r)
ef43aa38 676 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 677
c2e022cb 678 kunmap_atomic(dst);
34745785
MB		 679 return r;
680}
681
ed04d981
MB		 682static void crypt_iv_tcw_dtr(struct crypt_config *cc)
683{
684 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
685
686 kzfree(tcw->iv_seed);
687 tcw->iv_seed = NULL;
688 kzfree(tcw->whitening);
689 tcw->whitening = NULL;
690
691 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
692 crypto_free_shash(tcw->crc32_tfm);
693 tcw->crc32_tfm = NULL;
694}
695
696static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
697 const char *opts)
698{
699 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
700
8f0009a2
MB		 701 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
702 ti->error = "Unsupported sector size for TCW";
703 return -EINVAL;
704 }
705
ed04d981
MB		 706 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
707 ti->error = "Wrong key size for TCW";
708 return -EINVAL;
709 }
710
711 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
712 if (IS_ERR(tcw->crc32_tfm)) {
713 ti->error = "Error initializing CRC32 in TCW";
714 return PTR_ERR(tcw->crc32_tfm);
715 }
716
717 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
718 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
719 if (!tcw->iv_seed || !tcw->whitening) {
720 crypt_iv_tcw_dtr(cc);
721 ti->error = "Error allocating seed storage in TCW";
722 return -ENOMEM;
723 }
724
725 return 0;
726}
727
728static int crypt_iv_tcw_init(struct crypt_config *cc)
729{
730 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
731 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
732
733 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
734 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
735 TCW_WHITENING_SIZE);
736
737 return 0;
738}
739
740static int crypt_iv_tcw_wipe(struct crypt_config *cc)
741{
742 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
743
744 memset(tcw->iv_seed, 0, cc->iv_size);
745 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
746
747 return 0;
748}
749
750static int crypt_iv_tcw_whitening(struct crypt_config *cc,
751 struct dm_crypt_request *dmreq,
752 u8 *data)
753{
754 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 755 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 756 u8 buf[TCW_WHITENING_SIZE];
b6106265 757 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 758 int i, r;
759
760 /* xor whitening with sector number */
761 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
762 crypto_xor(buf, (u8 *)&sector, 8);
763 crypto_xor(&buf[8], (u8 *)&sector, 8);
764
765 /* calculate crc32 for every 32bit part and xor it */
b6106265
JSM		 766 desc->tfm = tcw->crc32_tfm;
767 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ed04d981 768 for (i = 0; i < 4; i++) {
b6106265 769 r = crypto_shash_init(desc);
ed04d981
MB		 770 if (r)
771 goto out;
b6106265 772 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 773 if (r)
774 goto out;
b6106265 775 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 776 if (r)
777 goto out;
778 }
779 crypto_xor(&buf[0], &buf[12], 4);
780 crypto_xor(&buf[4], &buf[8], 4);
781
782 /* apply whitening (8 bytes) to whole sector */
783 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
784 crypto_xor(data + i * 8, buf, 8);
785out:
1a71d6ff 786 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 787 return r;
788}
789
790static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
791 struct dm_crypt_request *dmreq)
792{
ef43aa38 793 struct scatterlist *sg;
ed04d981 794 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 795 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 796 u8 *src;
797 int r = 0;
798
799 /* Remove whitening from ciphertext */
800 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 801 sg = crypt_get_sg_data(cc, dmreq->sg_in);
802 src = kmap_atomic(sg_page(sg));
803 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 804 kunmap_atomic(src);
805 }
806
807 /* Calculate IV */
808 memcpy(iv, tcw->iv_seed, cc->iv_size);
809 crypto_xor(iv, (u8 *)&sector, 8);
810 if (cc->iv_size > 8)
811 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
812
813 return r;
814}
815
816static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
817 struct dm_crypt_request *dmreq)
818{
ef43aa38 819 struct scatterlist *sg;
ed04d981
MB		 820 u8 *dst;
821 int r;
822
823 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
824 return 0;
825
826 /* Apply whitening on ciphertext */
ef43aa38
MB		 827 sg = crypt_get_sg_data(cc, dmreq->sg_out);
828 dst = kmap_atomic(sg_page(sg));
829 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 830 kunmap_atomic(dst);
831
832 return r;
833}
834
ef43aa38
MB		 835static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
836 struct dm_crypt_request *dmreq)
837{
838 /* Used only for writes, there must be an additional space to store IV */
839 get_random_bytes(iv, cc->iv_size);
840 return 0;
841}
842
1b1b58f5 843static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 844 .generator = crypt_iv_plain_gen
845};
846
1b1b58f5 847static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 848 .generator = crypt_iv_plain64_gen
849};
850
7e3fd855
MB		 851static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
852 .generator = crypt_iv_plain64be_gen
853};
854
1b1b58f5 855static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 856 .ctr = crypt_iv_essiv_ctr,
857 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 858 .init = crypt_iv_essiv_init,
542da317 859 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 860 .generator = crypt_iv_essiv_gen
861};
862
1b1b58f5 863static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 864 .ctr = crypt_iv_benbi_ctr,
865 .dtr = crypt_iv_benbi_dtr,
866 .generator = crypt_iv_benbi_gen
867};
1da177e4 868
1b1b58f5 869static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 870 .generator = crypt_iv_null_gen
871};
872
1b1b58f5 873static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 874 .ctr = crypt_iv_lmk_ctr,
875 .dtr = crypt_iv_lmk_dtr,
876 .init = crypt_iv_lmk_init,
877 .wipe = crypt_iv_lmk_wipe,
878 .generator = crypt_iv_lmk_gen,
879 .post = crypt_iv_lmk_post
880};
881
1b1b58f5 882static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 883 .ctr = crypt_iv_tcw_ctr,
884 .dtr = crypt_iv_tcw_dtr,
885 .init = crypt_iv_tcw_init,
886 .wipe = crypt_iv_tcw_wipe,
887 .generator = crypt_iv_tcw_gen,
888 .post = crypt_iv_tcw_post
889};
890
ef43aa38
MB		 891static struct crypt_iv_operations crypt_iv_random_ops = {
892 .generator = crypt_iv_random_gen
893};
894
895/*
896 * Integrity extensions
897 */
898static bool crypt_integrity_aead(struct crypt_config *cc)
899{
900 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
901}
902
903static bool crypt_integrity_hmac(struct crypt_config *cc)
904{
33d2f09f 905 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 906}
907
908/* Get sg containing data */
909static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
910 struct scatterlist *sg)
911{
33d2f09f 912 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 913 return &sg[2];
914
915 return sg;
916}
917
918static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
919{
920 struct bio_integrity_payload *bip;
921 unsigned int tag_len;
922 int ret;
923
924 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
925 return 0;
926
927 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
928 if (IS_ERR(bip))
929 return PTR_ERR(bip);
930
931 tag_len = io->cc->on_disk_tag_size * bio_sectors(bio);
932
933 bip->bip_iter.bi_size = tag_len;
934 bip->bip_iter.bi_sector = io->cc->start + io->sector;
935
936 /* We own the metadata, do not let bio_free to release it */
937 bip->bip_flags &= ~BIP_BLOCK_INTEGRITY;
938
939 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
940 tag_len, offset_in_page(io->integrity_metadata));
941 if (unlikely(ret != tag_len))
942 return -ENOMEM;
943
944 return 0;
945}
946
947static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
948{
949#ifdef CONFIG_BLK_DEV_INTEGRITY
950 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
951
952 /* From now we require underlying device with our integrity profile */
953 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
954 ti->error = "Integrity profile not supported.";
955 return -EINVAL;
956 }
957
583fe747
MP		 958 if (bi->tag_size != cc->on_disk_tag_size ||
959 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 960 ti->error = "Integrity profile tag size mismatch.";
961 return -EINVAL;
962 }
583fe747
MP		 963 if (1 << bi->interval_exp != cc->sector_size) {
964 ti->error = "Integrity profile sector size mismatch.";
965 return -EINVAL;
966 }
ef43aa38 967
33d2f09f 968 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 969 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
970 DMINFO("Integrity AEAD, tag size %u, IV size %u.",
971 cc->integrity_tag_size, cc->integrity_iv_size);
972
973 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
974 ti->error = "Integrity AEAD auth tag size is not supported.";
975 return -EINVAL;
976 }
977 } else if (cc->integrity_iv_size)
978 DMINFO("Additional per-sector space %u bytes for IV.",
979 cc->integrity_iv_size);
980
981 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
982 ti->error = "Not enough space for integrity tag in the profile.";
983 return -EINVAL;
984 }
985
986 return 0;
987#else
988 ti->error = "Integrity profile not supported.";
989 return -EINVAL;
990#endif
991}
992
d469f841
MB		 993static void crypt_convert_init(struct crypt_config *cc,
994 struct convert_context *ctx,
995 struct bio *bio_out, struct bio *bio_in,
fcd369da 996 sector_t sector)
1da177e4
LT		 997{
998 ctx->bio_in = bio_in;
999 ctx->bio_out = bio_out;
003b5c57
KO		 1000 if (bio_in)
1001 ctx->iter_in = bio_in->bi_iter;
1002 if (bio_out)
1003 ctx->iter_out = bio_out->bi_iter;
c66029f4 1004 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1005 init_completion(&ctx->restart);
1da177e4
LT		 1006}
1007
b2174eeb 1008static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1009 void *req)
b2174eeb
HY		 1010{
1011 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1012}
1013
ef43aa38 1014static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1015{
ef43aa38 1016 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1017}
1018
2dc5327d
MB		 1019static u8 *iv_of_dmreq(struct crypt_config *cc,
1020 struct dm_crypt_request *dmreq)
1021{
33d2f09f 1022 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1023 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1024 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1025 else
1026 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1027 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1028}
1029
ef43aa38
MB		 1030static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1031 struct dm_crypt_request *dmreq)
1032{
1033 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1034}
1035
1036static uint64_t *org_sector_of_dmreq(struct crypt_config *cc,
1037 struct dm_crypt_request *dmreq)
1038{
1039 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
1040 return (uint64_t*) ptr;
1041}
1042
1043static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1044 struct dm_crypt_request *dmreq)
1045{
1046 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1047 cc->iv_size + sizeof(uint64_t);
1048 return (unsigned int*)ptr;
1049}
1050
1051static void *tag_from_dmreq(struct crypt_config *cc,
1052 struct dm_crypt_request *dmreq)
1053{
1054 struct convert_context *ctx = dmreq->ctx;
1055 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1056
1057 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1058 cc->on_disk_tag_size];
1059}
1060
1061static void *iv_tag_from_dmreq(struct crypt_config *cc,
1062 struct dm_crypt_request *dmreq)
1063{
1064 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1065}
1066
1067static int crypt_convert_block_aead(struct crypt_config *cc,
1068 struct convert_context *ctx,
1069 struct aead_request *req,
1070 unsigned int tag_offset)
01482b76 1071{
003b5c57
KO		 1072 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1073 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1074 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1075 u8 *iv, *org_iv, *tag_iv, *tag;
1076 uint64_t *sector;
1077 int r = 0;
1078
1079 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1080
8f0009a2
MB		 1081 /* Reject unexpected unaligned bio. */
1082 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1083 return -EIO;
3a7f6c99 1084
b2174eeb 1085 dmreq = dmreq_of_req(cc, req);
ef43aa38 1086 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1087 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1088 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1089 dmreq->ctx = ctx;
1090
1091 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1092
1093 sector = org_sector_of_dmreq(cc, dmreq);
1094 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1095
2dc5327d 1096 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1097 org_iv = org_iv_of_dmreq(cc, dmreq);
1098 tag = tag_from_dmreq(cc, dmreq);
1099 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1100
1101 /* AEAD request:
1102 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1103 * | (authenticated) | (auth+encryption) | |
1104 * | sector_LE | IV | sector in/out | tag in/out |
1105 */
1106 sg_init_table(dmreq->sg_in, 4);
1107 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1108 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1109 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1110 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1111
1112 sg_init_table(dmreq->sg_out, 4);
1113 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1114 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1115 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1116 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1117
1118 if (cc->iv_gen_ops) {
1119 /* For READs use IV stored in integrity metadata */
1120 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1121 memcpy(org_iv, tag_iv, cc->iv_size);
1122 } else {
1123 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1124 if (r < 0)
1125 return r;
1126 /* Store generated IV in integrity metadata */
1127 if (cc->integrity_iv_size)
1128 memcpy(tag_iv, org_iv, cc->iv_size);
1129 }
1130 /* Working copy of IV, to be modified in crypto API */
1131 memcpy(iv, org_iv, cc->iv_size);
1132 }
1133
1134 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1135 if (bio_data_dir(ctx->bio_in) == WRITE) {
1136 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1137 cc->sector_size, iv);
ef43aa38
MB		 1138 r = crypto_aead_encrypt(req);
1139 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1140 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1141 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1142 } else {
1143 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1144 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1145 r = crypto_aead_decrypt(req);
1146 }
1147
1148 if (r == -EBADMSG)
1149 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1150 (unsigned long long)le64_to_cpu(*sector));
1151
1152 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1153 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1154
8f0009a2
MB		 1155 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1156 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1157
ef43aa38
MB		 1158 return r;
1159}
1160
1161static int crypt_convert_block_skcipher(struct crypt_config *cc,
1162 struct convert_context *ctx,
1163 struct skcipher_request *req,
1164 unsigned int tag_offset)
1165{
1166 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1167 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1168 struct scatterlist *sg_in, *sg_out;
1169 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1170 u8 *iv, *org_iv, *tag_iv;
1171 uint64_t *sector;
1172 int r = 0;
01482b76 1173
8f0009a2
MB		 1174 /* Reject unexpected unaligned bio. */
1175 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1176 return -EIO;
1177
ef43aa38 1178 dmreq = dmreq_of_req(cc, req);
c66029f4 1179 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1180 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1181 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1182 dmreq->ctx = ctx;
01482b76 1183
ef43aa38
MB		 1184 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1185
1186 iv = iv_of_dmreq(cc, dmreq);
1187 org_iv = org_iv_of_dmreq(cc, dmreq);
1188 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1189
1190 sector = org_sector_of_dmreq(cc, dmreq);
1191 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1192
1193 /* For skcipher we use only the first sg item */
1194 sg_in = &dmreq->sg_in[0];
1195 sg_out = &dmreq->sg_out[0];
01482b76 1196
ef43aa38 1197 sg_init_table(sg_in, 1);
8f0009a2 1198 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1199
1200 sg_init_table(sg_out, 1);
8f0009a2 1201 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1202
3a7f6c99 1203 if (cc->iv_gen_ops) {
ef43aa38
MB		 1204 /* For READs use IV stored in integrity metadata */
1205 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1206 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1207 } else {
1208 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1209 if (r < 0)
1210 return r;
1211 /* Store generated IV in integrity metadata */
1212 if (cc->integrity_iv_size)
1213 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1214 }
1215 /* Working copy of IV, to be modified in crypto API */
1216 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1217 }
1218
8f0009a2 1219 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1220
1221 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1222 r = crypto_skcipher_encrypt(req);
3a7f6c99 1223 else
bbdb23b5 1224 r = crypto_skcipher_decrypt(req);
3a7f6c99 1225
2dc5327d 1226 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1227 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1228
8f0009a2
MB		 1229 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1230 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1231
3a7f6c99 1232 return r;
01482b76
MB		 1233}
1234
95497a96
MB		 1235static void kcryptd_async_done(struct crypto_async_request *async_req,
1236 int error);
c0297721 1237
ef43aa38
MB		 1238static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1239 struct convert_context *ctx)
ddd42edf 1240{
c66029f4 1241 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1242
ef43aa38
MB		 1243 if (!ctx->r.req)
1244 ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1245
ef43aa38 1246 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1247
1248 /*
1249 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1250 * requests if driver request queue is full.
1251 */
ef43aa38 1252 skcipher_request_set_callback(ctx->r.req,
c0297721 1253 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38 1254 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
ddd42edf
MB		 1255}
1256
ef43aa38
MB		 1257static void crypt_alloc_req_aead(struct crypt_config *cc,
1258 struct convert_context *ctx)
1259{
1260 if (!ctx->r.req_aead)
1261 ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1262
ef43aa38 1263 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1264
1265 /*
1266 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1267 * requests if driver request queue is full.
1268 */
ef43aa38 1269 aead_request_set_callback(ctx->r.req_aead,
c0297721 1270 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38
MB		 1271 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1272}
1273
1274static void crypt_alloc_req(struct crypt_config *cc,
1275 struct convert_context *ctx)
1276{
33d2f09f 1277 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1278 crypt_alloc_req_aead(cc, ctx);
1279 else
1280 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1281}
1282
ef43aa38
MB		 1283static void crypt_free_req_skcipher(struct crypt_config *cc,
1284 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1285{
1286 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1287
bbdb23b5 1288 if ((struct skcipher_request *)(io + 1) != req)
298a9fa0
MP		 1289 mempool_free(req, cc->req_pool);
1290}
1291
ef43aa38
MB		 1292static void crypt_free_req_aead(struct crypt_config *cc,
1293 struct aead_request *req, struct bio *base_bio)
1294{
1295 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1296
1297 if ((struct aead_request *)(io + 1) != req)
1298 mempool_free(req, cc->req_pool);
1299}
1300
1301static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1302{
33d2f09f 1303 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1304 crypt_free_req_aead(cc, req, base_bio);
1305 else
1306 crypt_free_req_skcipher(cc, req, base_bio);
1307}
1308
1da177e4
LT		 1309/*
1310 * Encrypt / decrypt data from one bio to another one (can be the same one)
1311 */
4e4cbee9 1312static blk_status_t crypt_convert(struct crypt_config *cc,
d469f841 1313 struct convert_context *ctx)
1da177e4 1314{
ef43aa38 1315 unsigned int tag_offset = 0;
ff3af92b 1316 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1317 int r;
1da177e4 1318
40b6229b 1319 atomic_set(&ctx->cc_pending, 1);
c8081618 1320
003b5c57 1321 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1322
3a7f6c99 1323 crypt_alloc_req(cc, ctx);
40b6229b 1324 atomic_inc(&ctx->cc_pending);
3f1e9070 1325
33d2f09f 1326 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1327 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1328 else
1329 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1330
1331 switch (r) {
54cea3f6
MB		 1332 /*
1333 * The request was queued by a crypto driver
1334 * but the driver request queue is full, let's wait.
1335 */
3a7f6c99
MB		 1336 case -EBUSY:
1337 wait_for_completion(&ctx->restart);
16735d02 1338 reinit_completion(&ctx->restart);
54cea3f6
MB		 1339 /* fall through */
1340 /*
1341 * The request is queued and processed asynchronously,
1342 * completion function kcryptd_async_done() will be called.
1343 */
c0403ec0 1344 case -EINPROGRESS:
ef43aa38 1345 ctx->r.req = NULL;
8f0009a2 1346 ctx->cc_sector += sector_step;
583fe747 1347 tag_offset++;
3f1e9070 1348 continue;
54cea3f6
MB		 1349 /*
1350 * The request was already processed (synchronously).
1351 */
3a7f6c99 1352 case 0:
40b6229b 1353 atomic_dec(&ctx->cc_pending);
8f0009a2 1354 ctx->cc_sector += sector_step;
583fe747 1355 tag_offset++;
c7f1b204 1356 cond_resched();
3a7f6c99 1357 continue;
ef43aa38
MB		 1358 /*
1359 * There was a data integrity error.
1360 */
1361 case -EBADMSG:
1362 atomic_dec(&ctx->cc_pending);
4e4cbee9 1363 return BLK_STS_PROTECTION;
ef43aa38
MB		 1364 /*
1365 * There was an error while processing the request.
1366 */
3f1e9070 1367 default:
40b6229b 1368 atomic_dec(&ctx->cc_pending);
4e4cbee9 1369 return BLK_STS_IOERR;
3f1e9070 1370 }
1da177e4
LT		 1371 }
1372
3f1e9070 1373 return 0;
1da177e4
LT		 1374}
1375
cf2f1abf
MP		 1376static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1377
1da177e4
LT		 1378/*
1379 * Generate a new unfragmented bio with the given size
586b286b
MS		 1380 * This should never violate the device limitations (but only because
1381 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1382 *
1383 * This function may be called concurrently. If we allocate from the mempool
1384 * concurrently, there is a possibility of deadlock. For example, if we have
1385 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1386 * the mempool concurrently, it may deadlock in a situation where both processes
1387 * have allocated 128 pages and the mempool is exhausted.
1388 *
1389 * In order to avoid this scenario we allocate the pages under a mutex.
1390 *
1391 * In order to not degrade performance with excessive locking, we try
1392 * non-blocking allocations without a mutex first but on failure we fallback
1393 * to blocking allocations with a mutex.
1da177e4 1394 */
cf2f1abf 1395static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1396{
49a8a920 1397 struct crypt_config *cc = io->cc;
8b004457 1398 struct bio *clone;
1da177e4 1399 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1400 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1401 unsigned i, len, remaining_size;
91e10625 1402 struct page *page;
1da177e4 1403
7145c241 1404retry:
d0164adc 1405 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1406 mutex_lock(&cc->bio_alloc_lock);
1407
2f9941b6 1408 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
8b004457 1409 if (!clone)
ef43aa38 1410 goto out;
1da177e4 1411
027581f3 1412 clone_init(io, clone);
6a24c718 1413
7145c241
MP		 1414 remaining_size = size;
1415
f97380bc 1416 for (i = 0; i < nr_iovecs; i++) {
91e10625 1417 page = mempool_alloc(cc->page_pool, gfp_mask);
7145c241
MP		 1418 if (!page) {
1419 crypt_free_buffer_pages(cc, clone);
1420 bio_put(clone);
d0164adc 1421 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1422 goto retry;
1423 }
1da177e4 1424
7145c241 1425 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1426
0dae7fe5 1427 bio_add_page(clone, page, len, 0);
1da177e4 1428
7145c241 1429 remaining_size -= len;
1da177e4
LT		 1430 }
1431
ef43aa38
MB		 1432 /* Allocate space for integrity tags */
1433 if (dm_crypt_integrity_io_alloc(io, clone)) {
1434 crypt_free_buffer_pages(cc, clone);
1435 bio_put(clone);
1436 clone = NULL;
1437 }
1438out:
d0164adc 1439 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1440 mutex_unlock(&cc->bio_alloc_lock);
1441
8b004457 1442 return clone;
1da177e4
LT		 1443}
1444
644bd2f0 1445static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1446{
644bd2f0 1447 unsigned int i;
1da177e4
LT		 1448 struct bio_vec *bv;
1449
cb34e057 1450 bio_for_each_segment_all(bv, clone, i) {
1da177e4
LT		 1451 BUG_ON(!bv->bv_page);
1452 mempool_free(bv->bv_page, cc->page_pool);
1453 bv->bv_page = NULL;
1454 }
1455}
1456
298a9fa0
MP		 1457static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1458 struct bio *bio, sector_t sector)
dc440d1e 1459{
49a8a920 1460 io->cc = cc;
dc440d1e
MB		 1461 io->base_bio = bio;
1462 io->sector = sector;
1463 io->error = 0;
ef43aa38
MB		 1464 io->ctx.r.req = NULL;
1465 io->integrity_metadata = NULL;
1466 io->integrity_metadata_from_pool = false;
40b6229b 1467 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1468}
1469
3e1a8bdd
MB		 1470static void crypt_inc_pending(struct dm_crypt_io *io)
1471{
40b6229b 1472 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1473}
1474
1da177e4
LT		 1475/*
1476 * One of the bios was finished. Check for completion of
1477 * the whole request and correctly clean up the buffer.
1478 */
5742fd77 1479static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1480{
49a8a920 1481 struct crypt_config *cc = io->cc;
b35f8caa 1482 struct bio *base_bio = io->base_bio;
4e4cbee9 1483 blk_status_t error = io->error;
1da177e4 1484
40b6229b 1485 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1486 return;
1487
ef43aa38
MB		 1488 if (io->ctx.r.req)
1489 crypt_free_req(cc, io->ctx.r.req, base_bio);
1490
1491 if (unlikely(io->integrity_metadata_from_pool))
1492 mempool_free(io->integrity_metadata, io->cc->tag_pool);
1493 else
1494 kfree(io->integrity_metadata);
b35f8caa 1495
4e4cbee9 1496 base_bio->bi_status = error;
4246a0b6 1497 bio_endio(base_bio);
1da177e4
LT		 1498}
1499
1500/*
cabf08e4 1501 * kcryptd/kcryptd_io:
1da177e4
LT		 1502 *
1503 * Needed because it would be very unwise to do decryption in an
23541d2d 1504 * interrupt context.
cabf08e4
MB		 1505 *
1506 * kcryptd performs the actual encryption or decryption.
1507 *
1508 * kcryptd_io performs the IO submission.
1509 *
1510 * They must be separated as otherwise the final stages could be
1511 * starved by new requests which can block in the first stages due
1512 * to memory allocation.
c0297721
AK		 1513 *
1514 * The work is done per CPU global for all dm-crypt instances.
1515 * They should not depend on each other and do not block.
1da177e4 1516 */
4246a0b6 1517static void crypt_endio(struct bio *clone)
8b004457 1518{
028867ac 1519 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1520 struct crypt_config *cc = io->cc;
ee7a491e 1521 unsigned rw = bio_data_dir(clone);
4e4cbee9 1522 blk_status_t error;
8b004457
MB		 1523
1524 /*
6712ecf8 1525 * free the processed pages
8b004457 1526 */
ee7a491e 1527 if (rw == WRITE)
644bd2f0 1528 crypt_free_buffer_pages(cc, clone);
8b004457 1529
4e4cbee9 1530 error = clone->bi_status;
8b004457 1531 bio_put(clone);
8b004457 1532
9b81c842 1533 if (rw == READ && !error) {
ee7a491e
MB		 1534 kcryptd_queue_crypt(io);
1535 return;
1536 }
5742fd77 1537
9b81c842
SL		 1538 if (unlikely(error))
1539 io->error = error;
5742fd77
MB		 1540
1541 crypt_dec_pending(io);
8b004457
MB		 1542}
1543
028867ac 1544static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1545{
49a8a920 1546 struct crypt_config *cc = io->cc;
8b004457
MB		 1547
1548 clone->bi_private = io;
1549 clone->bi_end_io = crypt_endio;
1550 clone->bi_bdev = cc->dev->bdev;
ef295ecf 1551 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1552}
1553
20c82538 1554static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1555{
49a8a920 1556 struct crypt_config *cc = io->cc;
8b004457 1557 struct bio *clone;
93e605c2 1558
8b004457 1559 /*
59779079
MS		 1560 * We need the original biovec array in order to decrypt
1561 * the whole bio data *afterwards* -- thanks to immutable
1562 * biovecs we don't need to worry about the block layer
1563 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1564 */
59779079 1565 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
7eaceacc 1566 if (!clone)
20c82538 1567 return 1;
8b004457 1568
20c82538
MB		 1569 crypt_inc_pending(io);
1570
8b004457 1571 clone_init(io, clone);
4f024f37 1572 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1573
ef43aa38
MB		 1574 if (dm_crypt_integrity_io_alloc(io, clone)) {
1575 crypt_dec_pending(io);
1576 bio_put(clone);
1577 return 1;
1578 }
1579
93e605c2 1580 generic_make_request(clone);
20c82538 1581 return 0;
8b004457
MB		 1582}
1583
dc267621
MP		 1584static void kcryptd_io_read_work(struct work_struct *work)
1585{
1586 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1587
1588 crypt_inc_pending(io);
1589 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1590 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1591 crypt_dec_pending(io);
1592}
1593
1594static void kcryptd_queue_read(struct dm_crypt_io *io)
1595{
1596 struct crypt_config *cc = io->cc;
1597
1598 INIT_WORK(&io->work, kcryptd_io_read_work);
1599 queue_work(cc->io_queue, &io->work);
1600}
1601
4e4eef64
MB		 1602static void kcryptd_io_write(struct dm_crypt_io *io)
1603{
95497a96 1604 struct bio *clone = io->ctx.bio_out;
dc267621 1605
95497a96 1606 generic_make_request(clone);
4e4eef64
MB		 1607}
1608
b3c5fd30
MP		 1609#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1610
dc267621 1611static int dmcrypt_write(void *data)
395b167c 1612{
dc267621 1613 struct crypt_config *cc = data;
b3c5fd30
MP		 1614 struct dm_crypt_io *io;
1615
dc267621 1616 while (1) {
b3c5fd30 1617 struct rb_root write_tree;
dc267621 1618 struct blk_plug plug;
395b167c 1619
dc267621 1620 DECLARE_WAITQUEUE(wait, current);
395b167c 1621
dc267621
MP		 1622 spin_lock_irq(&cc->write_thread_wait.lock);
1623continue_locked:
395b167c 1624
b3c5fd30 1625 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1626 goto pop_from_list;
1627
f659b100 1628 set_current_state(TASK_INTERRUPTIBLE);
dc267621
MP		 1629 __add_wait_queue(&cc->write_thread_wait, &wait);
1630
1631 spin_unlock_irq(&cc->write_thread_wait.lock);
1632
f659b100 1633 if (unlikely(kthread_should_stop())) {
642fa448 1634 set_current_state(TASK_RUNNING);
f659b100
RV		 1635 remove_wait_queue(&cc->write_thread_wait, &wait);
1636 break;
1637 }
1638
dc267621
MP		 1639 schedule();
1640
642fa448 1641 set_current_state(TASK_RUNNING);
dc267621
MP		 1642 spin_lock_irq(&cc->write_thread_wait.lock);
1643 __remove_wait_queue(&cc->write_thread_wait, &wait);
1644 goto continue_locked;
1645
1646pop_from_list:
b3c5fd30
MP		 1647 write_tree = cc->write_tree;
1648 cc->write_tree = RB_ROOT;
dc267621
MP		 1649 spin_unlock_irq(&cc->write_thread_wait.lock);
1650
b3c5fd30
MP		 1651 BUG_ON(rb_parent(write_tree.rb_node));
1652
1653 /*
1654 * Note: we cannot walk the tree here with rb_next because
1655 * the structures may be freed when kcryptd_io_write is called.
1656 */
dc267621
MP		 1657 blk_start_plug(&plug);
1658 do {
b3c5fd30
MP		 1659 io = crypt_io_from_node(rb_first(&write_tree));
1660 rb_erase(&io->rb_node, &write_tree);
dc267621 1661 kcryptd_io_write(io);
b3c5fd30 1662 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1663 blk_finish_plug(&plug);
1664 }
1665 return 0;
395b167c
AK		 1666}
1667
72c6e7af 1668static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1669{
dec1cedf 1670 struct bio *clone = io->ctx.bio_out;
49a8a920 1671 struct crypt_config *cc = io->cc;
dc267621 1672 unsigned long flags;
b3c5fd30
MP		 1673 sector_t sector;
1674 struct rb_node **rbp, *parent;
dec1cedf 1675
4e4cbee9 1676 if (unlikely(io->error)) {
dec1cedf
MB		 1677 crypt_free_buffer_pages(cc, clone);
1678 bio_put(clone);
6c031f41 1679 crypt_dec_pending(io);
dec1cedf
MB		 1680 return;
1681 }
1682
1683 /* crypt_convert should have filled the clone bio */
003b5c57 1684 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1685
4f024f37 1686 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1687
0f5d8e6e
MP		 1688 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1689 generic_make_request(clone);
1690 return;
1691 }
1692
dc267621 1693 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
b3c5fd30
MP		 1694 rbp = &cc->write_tree.rb_node;
1695 parent = NULL;
1696 sector = io->sector;
1697 while (*rbp) {
1698 parent = *rbp;
1699 if (sector < crypt_io_from_node(parent)->sector)
1700 rbp = &(*rbp)->rb_left;
1701 else
1702 rbp = &(*rbp)->rb_right;
1703 }
1704 rb_link_node(&io->rb_node, parent, rbp);
1705 rb_insert_color(&io->rb_node, &cc->write_tree);
1706
dc267621
MP		 1707 wake_up_locked(&cc->write_thread_wait);
1708 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
4e4eef64
MB		 1709}
1710
fc5a5e9a 1711static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1712{
49a8a920 1713 struct crypt_config *cc = io->cc;
8b004457 1714 struct bio *clone;
c8081618 1715 int crypt_finished;
b635b00e 1716 sector_t sector = io->sector;
4e4cbee9 1717 blk_status_t r;
8b004457 1718
fc5a5e9a
MB		 1719 /*
1720 * Prevent io from disappearing until this function completes.
1721 */
1722 crypt_inc_pending(io);
b635b00e 1723 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1724
cf2f1abf
MP		 1725 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1726 if (unlikely(!clone)) {
4e4cbee9 1727 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 1728 goto dec;
1729 }
c8081618 1730
cf2f1abf
MP		 1731 io->ctx.bio_out = clone;
1732 io->ctx.iter_out = clone->bi_iter;
b635b00e 1733
cf2f1abf 1734 sector += bio_sectors(clone);
93e605c2 1735
cf2f1abf
MP		 1736 crypt_inc_pending(io);
1737 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1738 if (r)
ef43aa38 1739 io->error = r;
cf2f1abf 1740 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1741
cf2f1abf
MP		 1742 /* Encryption was already finished, submit io now */
1743 if (crypt_finished) {
1744 kcryptd_crypt_write_io_submit(io, 0);
1745 io->sector = sector;
93e605c2 1746 }
899c95d3 1747
cf2f1abf 1748dec:
899c95d3 1749 crypt_dec_pending(io);
84131db6
MB		 1750}
1751
72c6e7af 1752static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1753{
5742fd77
MB		 1754 crypt_dec_pending(io);
1755}
1756
4e4eef64 1757static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1758{
49a8a920 1759 struct crypt_config *cc = io->cc;
4e4cbee9 1760 blk_status_t r;
1da177e4 1761
3e1a8bdd 1762 crypt_inc_pending(io);
3a7f6c99 1763
53017030 1764 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1765 io->sector);
1da177e4 1766
5742fd77 1767 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1768 if (r)
ef43aa38 1769 io->error = r;
5742fd77 1770
40b6229b 1771 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1772 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1773
1774 crypt_dec_pending(io);
1da177e4
LT		 1775}
1776
95497a96
MB		 1777static void kcryptd_async_done(struct crypto_async_request *async_req,
1778 int error)
1779{
b2174eeb
HY		 1780 struct dm_crypt_request *dmreq = async_req->data;
1781 struct convert_context *ctx = dmreq->ctx;
95497a96 1782 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1783 struct crypt_config *cc = io->cc;
95497a96 1784
54cea3f6
MB		 1785 /*
1786 * A request from crypto driver backlog is going to be processed now,
1787 * finish the completion and continue in crypt_convert().
1788 * (Callback will be called for the second time for this request.)
1789 */
c0403ec0
RV		 1790 if (error == -EINPROGRESS) {
1791 complete(&ctx->restart);
95497a96 1792 return;
c0403ec0 1793 }
95497a96 1794
2dc5327d 1795 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 1796 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 1797
ef43aa38
MB		 1798 if (error == -EBADMSG) {
1799 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1800 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 1801 io->error = BLK_STS_PROTECTION;
ef43aa38 1802 } else if (error < 0)
4e4cbee9 1803 io->error = BLK_STS_IOERR;
72c6e7af 1804
298a9fa0 1805 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1806
40b6229b 1807 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1808 return;
95497a96
MB		 1809
1810 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1811 kcryptd_crypt_read_done(io);
95497a96 1812 else
72c6e7af 1813 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1814}
1815
395b167c 1816static void kcryptd_crypt(struct work_struct *work)
1da177e4 1817{
028867ac 1818 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1819
cabf08e4 1820 if (bio_data_dir(io->base_bio) == READ)
395b167c 1821 kcryptd_crypt_read_convert(io);
4e4eef64 1822 else
395b167c 1823 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1824}
1825
395b167c 1826static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1827{
49a8a920 1828 struct crypt_config *cc = io->cc;
cabf08e4 1829
395b167c
AK		 1830 INIT_WORK(&io->work, kcryptd_crypt);
1831 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1832}
1833
ef43aa38 1834static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 1835{
ef43aa38
MB		 1836 if (!cc->cipher_tfm.tfms_aead)
1837 return;
1da177e4 1838
ef43aa38
MB		 1839 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1840 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1841 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 1842 }
1843
ef43aa38
MB		 1844 kfree(cc->cipher_tfm.tfms_aead);
1845 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 1846}
1847
ef43aa38 1848static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1849{
d1f96423
MB		 1850 unsigned i;
1851
ef43aa38 1852 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1853 return;
1854
d1f96423 1855 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1856 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1857 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1858 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1859 }
fd2d231f 1860
ef43aa38
MB		 1861 kfree(cc->cipher_tfm.tfms);
1862 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1863}
1864
ef43aa38
MB		 1865static void crypt_free_tfms(struct crypt_config *cc)
1866{
33d2f09f 1867 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1868 crypt_free_tfms_aead(cc);
1869 else
1870 crypt_free_tfms_skcipher(cc);
1871}
1872
1873static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1874{
d1f96423
MB		 1875 unsigned i;
1876 int err;
1877
ef43aa38
MB		 1878 cc->cipher_tfm.tfms = kzalloc(cc->tfms_count *
1879 sizeof(struct crypto_skcipher *), GFP_KERNEL);
1880 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1881 return -ENOMEM;
1882
d1f96423 1883 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1884 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1885 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1886 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1887 crypt_free_tfms(cc);
d1f96423
MB		 1888 return err;
1889 }
1890 }
1891
1892 return 0;
1893}
1894
ef43aa38
MB		 1895static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1896{
ef43aa38
MB		 1897 int err;
1898
1899 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1900 if (!cc->cipher_tfm.tfms)
1901 return -ENOMEM;
1902
ef43aa38
MB		 1903 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1904 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1905 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1906 crypt_free_tfms(cc);
1907 return err;
1908 }
1909
ef43aa38
MB		 1910 return 0;
1911}
1912
1913static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1914{
33d2f09f 1915 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1916 return crypt_alloc_tfms_aead(cc, ciphermode);
1917 else
1918 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1919}
1920
1921static unsigned crypt_subkey_size(struct crypt_config *cc)
1922{
1923 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1924}
1925
1926static unsigned crypt_authenckey_size(struct crypt_config *cc)
1927{
1928 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1929}
1930
1931/*
1932 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1933 * the key must be for some reason in special format.
1934 * This funcion converts cc->key to this special format.
1935 */
1936static void crypt_copy_authenckey(char *p, const void *key,
1937 unsigned enckeylen, unsigned authkeylen)
1938{
1939 struct crypto_authenc_key_param *param;
1940 struct rtattr *rta;
1941
1942 rta = (struct rtattr *)p;
1943 param = RTA_DATA(rta);
1944 param->enckeylen = cpu_to_be32(enckeylen);
1945 rta->rta_len = RTA_LENGTH(sizeof(*param));
1946 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1947 p += RTA_SPACE(sizeof(*param));
1948 memcpy(p, key + enckeylen, authkeylen);
1949 p += authkeylen;
1950 memcpy(p, key, enckeylen);
1951}
1952
671ea6b4 1953static int crypt_setkey(struct crypt_config *cc)
c0297721 1954{
da31a078 1955 unsigned subkey_size;
fd2d231f
MP		 1956 int err = 0, i, r;
1957
da31a078 1958 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1959 subkey_size = crypt_subkey_size(cc);
da31a078 1960
ef43aa38
MB		 1961 if (crypt_integrity_hmac(cc))
1962 crypt_copy_authenckey(cc->authenc_key, cc->key,
1963 subkey_size - cc->key_mac_size,
1964 cc->key_mac_size);
fd2d231f 1965 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 1966 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 1967 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1968 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 1969 else if (crypt_integrity_aead(cc))
1970 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1971 cc->key + (i * subkey_size),
1972 subkey_size);
ef43aa38
MB		 1973 else
1974 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
1975 cc->key + (i * subkey_size),
1976 subkey_size);
fd2d231f
MP		 1977 if (r)
1978 err = r;
c0297721
AK		 1979 }
1980
ef43aa38
MB		 1981 if (crypt_integrity_hmac(cc))
1982 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
1983
c0297721
AK		 1984 return err;
1985}
1986
c538f6ec
OK		 1987#ifdef CONFIG_KEYS
1988
027c431c
OK		 1989static bool contains_whitespace(const char *str)
1990{
1991 while (*str)
1992 if (isspace(*str++))
1993 return true;
1994 return false;
1995}
1996
c538f6ec
OK		 1997static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
1998{
1999 char *new_key_string, *key_desc;
2000 int ret;
2001 struct key *key;
2002 const struct user_key_payload *ukp;
2003
027c431c
OK		 2004 /*
2005 * Reject key_string with whitespace. dm core currently lacks code for
2006 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2007 */
2008 if (contains_whitespace(key_string)) {
2009 DMERR("whitespace chars not allowed in key string");
2010 return -EINVAL;
2011 }
2012
c538f6ec
OK		 2013 /* look for next ':' separating key_type from key_description */
2014 key_desc = strpbrk(key_string, ":");
2015 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2016 return -EINVAL;
2017
2018 if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
2019 strncmp(key_string, "user:", key_desc - key_string + 1))
2020 return -EINVAL;
2021
2022 new_key_string = kstrdup(key_string, GFP_KERNEL);
2023 if (!new_key_string)
2024 return -ENOMEM;
2025
2026 key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
2027 key_desc + 1, NULL);
2028 if (IS_ERR(key)) {
2029 kzfree(new_key_string);
2030 return PTR_ERR(key);
2031 }
2032
f5b0cba8 2033 down_read(&key->sem);
c538f6ec 2034
0837e49a 2035 ukp = user_key_payload_locked(key);
c538f6ec 2036 if (!ukp) {
f5b0cba8 2037 up_read(&key->sem);
c538f6ec
OK		 2038 key_put(key);
2039 kzfree(new_key_string);
2040 return -EKEYREVOKED;
2041 }
2042
2043 if (cc->key_size != ukp->datalen) {
f5b0cba8 2044 up_read(&key->sem);
c538f6ec
OK		 2045 key_put(key);
2046 kzfree(new_key_string);
2047 return -EINVAL;
2048 }
2049
2050 memcpy(cc->key, ukp->data, cc->key_size);
2051
f5b0cba8 2052 up_read(&key->sem);
c538f6ec
OK		 2053 key_put(key);
2054
2055 /* clear the flag since following operations may invalidate previously valid key */
2056 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2057
2058 ret = crypt_setkey(cc);
2059
2060 /* wipe the kernel key payload copy in each case */
2061 memset(cc->key, 0, cc->key_size * sizeof(u8));
2062
2063 if (!ret) {
2064 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2065 kzfree(cc->key_string);
2066 cc->key_string = new_key_string;
2067 } else
2068 kzfree(new_key_string);
2069
2070 return ret;
2071}
2072
2073static int get_key_size(char **key_string)
2074{
2075 char *colon, dummy;
2076 int ret;
2077
2078 if (*key_string[0] != ':')
2079 return strlen(*key_string) >> 1;
2080
2081 /* look for next ':' in key string */
2082 colon = strpbrk(*key_string + 1, ":");
2083 if (!colon)
2084 return -EINVAL;
2085
2086 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2087 return -EINVAL;
2088
2089 *key_string = colon;
2090
2091 /* remaining key string should be :<logon|user>:<key_desc> */
2092
2093 return ret;
2094}
2095
2096#else
2097
2098static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2099{
2100 return -EINVAL;
2101}
2102
2103static int get_key_size(char **key_string)
2104{
2105 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2106}
2107
2108#endif
2109
e48d4bbf
MB		 2110static int crypt_set_key(struct crypt_config *cc, char *key)
2111{
de8be5ac
MB		 2112 int r = -EINVAL;
2113 int key_string_len = strlen(key);
2114
69a8cfcd
MB		 2115 /* Hyphen (which gives a key_size of zero) means there is no key. */
2116 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2117 goto out;
e48d4bbf 2118
c538f6ec
OK		 2119 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2120 if (key[0] == ':') {
2121 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2122 goto out;
c538f6ec 2123 }
e48d4bbf 2124
265e9098
OK		 2125 /* clear the flag since following operations may invalidate previously valid key */
2126 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2127
c538f6ec
OK		 2128 /* wipe references to any kernel keyring key */
2129 kzfree(cc->key_string);
2130 cc->key_string = NULL;
2131
e944e03e
AS		 2132 /* Decode key from its hex representation. */
2133 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2134 goto out;
e48d4bbf 2135
671ea6b4 2136 r = crypt_setkey(cc);
265e9098
OK		 2137 if (!r)
2138 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2139
2140out:
2141 /* Hex key string not needed after here, so wipe it. */
2142 memset(key, '0', key_string_len);
2143
2144 return r;
e48d4bbf
MB		 2145}
2146
2147static int crypt_wipe_key(struct crypt_config *cc)
2148{
c82feeec
OK		 2149 int r;
2150
e48d4bbf 2151 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2152 get_random_bytes(&cc->key, cc->key_size);
c538f6ec
OK		 2153 kzfree(cc->key_string);
2154 cc->key_string = NULL;
c82feeec
OK		 2155 r = crypt_setkey(cc);
2156 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2157
c82feeec 2158 return r;
e48d4bbf
MB		 2159}
2160
28513fcc
MB		 2161static void crypt_dtr(struct dm_target *ti)
2162{
2163 struct crypt_config *cc = ti->private;
2164
2165 ti->private = NULL;
2166
2167 if (!cc)
2168 return;
2169
f659b100 2170 if (cc->write_thread)
dc267621
MP		 2171 kthread_stop(cc->write_thread);
2172
28513fcc
MB		 2173 if (cc->io_queue)
2174 destroy_workqueue(cc->io_queue);
2175 if (cc->crypt_queue)
2176 destroy_workqueue(cc->crypt_queue);
2177
fd2d231f
MP		 2178 crypt_free_tfms(cc);
2179
28513fcc
MB		 2180 if (cc->bs)
2181 bioset_free(cc->bs);
2182
6f65985e
JL		 2183 mempool_destroy(cc->page_pool);
2184 mempool_destroy(cc->req_pool);
ef43aa38 2185 mempool_destroy(cc->tag_pool);
28513fcc
MB		 2186
2187 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2188 cc->iv_gen_ops->dtr(cc);
2189
28513fcc
MB		 2190 if (cc->dev)
2191 dm_put_device(ti, cc->dev);
2192
5ebaee6d 2193 kzfree(cc->cipher);
7dbcd137 2194 kzfree(cc->cipher_string);
c538f6ec 2195 kzfree(cc->key_string);
ef43aa38
MB		 2196 kzfree(cc->cipher_auth);
2197 kzfree(cc->authenc_key);
28513fcc
MB		 2198
2199 /* Must zero key material before freeing */
2200 kzfree(cc);
2201}
2202
e889f97a
MB		 2203static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2204{
2205 struct crypt_config *cc = ti->private;
2206
33d2f09f 2207 if (crypt_integrity_aead(cc))
e889f97a
MB		 2208 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2209 else
2210 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2211
e889f97a
MB		 2212 if (cc->iv_size)
2213 /* at least a 64 bit sector number should fit in our buffer */
2214 cc->iv_size = max(cc->iv_size,
2215 (unsigned int)(sizeof(u64) / sizeof(u8)));
2216 else if (ivmode) {
2217 DMWARN("Selected cipher does not support IVs");
2218 ivmode = NULL;
2219 }
2220
2221 /* Choose ivmode, see comments at iv code. */
2222 if (ivmode == NULL)
2223 cc->iv_gen_ops = NULL;
2224 else if (strcmp(ivmode, "plain") == 0)
2225 cc->iv_gen_ops = &crypt_iv_plain_ops;
2226 else if (strcmp(ivmode, "plain64") == 0)
2227 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2228 else if (strcmp(ivmode, "plain64be") == 0)
2229 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2230 else if (strcmp(ivmode, "essiv") == 0)
2231 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2232 else if (strcmp(ivmode, "benbi") == 0)
2233 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2234 else if (strcmp(ivmode, "null") == 0)
2235 cc->iv_gen_ops = &crypt_iv_null_ops;
2236 else if (strcmp(ivmode, "lmk") == 0) {
2237 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2238 /*
2239 * Version 2 and 3 is recognised according
2240 * to length of provided multi-key string.
2241 * If present (version 3), last key is used as IV seed.
2242 * All keys (including IV seed) are always the same size.
2243 */
2244 if (cc->key_size % cc->key_parts) {
2245 cc->key_parts++;
2246 cc->key_extra_size = cc->key_size / cc->key_parts;
2247 }
2248 } else if (strcmp(ivmode, "tcw") == 0) {
2249 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2250 cc->key_parts += 2; /* IV + whitening */
2251 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2252 } else if (strcmp(ivmode, "random") == 0) {
2253 cc->iv_gen_ops = &crypt_iv_random_ops;
2254 /* Need storage space in integrity fields. */
2255 cc->integrity_iv_size = cc->iv_size;
2256 } else {
2257 ti->error = "Invalid IV mode";
2258 return -EINVAL;
2259 }
2260
2261 return 0;
2262}
2263
33d2f09f
MB		 2264/*
2265 * Workaround to parse cipher algorithm from crypto API spec.
2266 * The cc->cipher is currently used only in ESSIV.
2267 * This should be probably done by crypto-api calls (once available...)
2268 */
2269static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2270{
2271 const char *alg_name = NULL;
2272 char *start, *end;
2273
2274 if (crypt_integrity_aead(cc)) {
2275 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2276 if (!alg_name)
2277 return -EINVAL;
2278 if (crypt_integrity_hmac(cc)) {
2279 alg_name = strchr(alg_name, ',');
2280 if (!alg_name)
2281 return -EINVAL;
2282 }
2283 alg_name++;
2284 } else {
2285 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2286 if (!alg_name)
2287 return -EINVAL;
2288 }
2289
2290 start = strchr(alg_name, '(');
2291 end = strchr(alg_name, ')');
2292
2293 if (!start && !end) {
2294 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2295 return cc->cipher ? 0 : -ENOMEM;
2296 }
2297
2298 if (!start || !end || ++start >= end)
2299 return -EINVAL;
2300
2301 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2302 if (!cc->cipher)
2303 return -ENOMEM;
2304
2305 strncpy(cc->cipher, start, end - start);
2306
2307 return 0;
2308}
2309
2310/*
2311 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2312 * The HMAC is needed to calculate tag size (HMAC digest size).
2313 * This should be probably done by crypto-api calls (once available...)
2314 */
2315static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2316{
2317 char *start, *end, *mac_alg = NULL;
2318 struct crypto_ahash *mac;
2319
2320 if (!strstarts(cipher_api, "authenc("))
2321 return 0;
2322
2323 start = strchr(cipher_api, '(');
2324 end = strchr(cipher_api, ',');
2325 if (!start || !end || ++start > end)
2326 return -EINVAL;
2327
2328 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2329 if (!mac_alg)
2330 return -ENOMEM;
2331 strncpy(mac_alg, start, end - start);
2332
2333 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2334 kfree(mac_alg);
2335
2336 if (IS_ERR(mac))
2337 return PTR_ERR(mac);
2338
2339 cc->key_mac_size = crypto_ahash_digestsize(mac);
2340 crypto_free_ahash(mac);
2341
2342 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2343 if (!cc->authenc_key)
2344 return -ENOMEM;
2345
2346 return 0;
2347}
2348
2349static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2350 char **ivmode, char **ivopts)
2351{
2352 struct crypt_config *cc = ti->private;
2353 char *tmp, *cipher_api;
2354 int ret = -EINVAL;
2355
2356 cc->tfms_count = 1;
2357
2358 /*
2359 * New format (capi: prefix)
2360 * capi:cipher_api_spec-iv:ivopts
2361 */
2362 tmp = &cipher_in[strlen("capi:")];
2363 cipher_api = strsep(&tmp, "-");
2364 *ivmode = strsep(&tmp, ":");
2365 *ivopts = tmp;
2366
2367 if (*ivmode && !strcmp(*ivmode, "lmk"))
2368 cc->tfms_count = 64;
2369
2370 cc->key_parts = cc->tfms_count;
2371
2372 /* Allocate cipher */
2373 ret = crypt_alloc_tfms(cc, cipher_api);
2374 if (ret < 0) {
2375 ti->error = "Error allocating crypto tfm";
2376 return ret;
2377 }
2378
2379 /* Alloc AEAD, can be used only in new format. */
2380 if (crypt_integrity_aead(cc)) {
2381 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2382 if (ret < 0) {
2383 ti->error = "Invalid AEAD cipher spec";
2384 return -ENOMEM;
2385 }
2386 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2387 } else
2388 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2389
2390 ret = crypt_ctr_blkdev_cipher(cc);
2391 if (ret < 0) {
2392 ti->error = "Cannot allocate cipher string";
2393 return -ENOMEM;
2394 }
2395
2396 return 0;
2397}
2398
2399static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2400 char **ivmode, char **ivopts)
1da177e4 2401{
5ebaee6d 2402 struct crypt_config *cc = ti->private;
33d2f09f 2403 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2404 char *cipher_api = NULL;
fd2d231f 2405 int ret = -EINVAL;
31998ef1 2406 char dummy;
1da177e4 2407
33d2f09f 2408 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2409 ti->error = "Bad cipher specification";
1da177e4
LT		 2410 return -EINVAL;
2411 }
2412
5ebaee6d
MB		 2413 /*
2414 * Legacy dm-crypt cipher specification
d1f96423 2415 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2416 */
2417 tmp = cipher_in;
d1f96423
MB		 2418 keycount = strsep(&tmp, "-");
2419 cipher = strsep(&keycount, ":");
2420
2421 if (!keycount)
2422 cc->tfms_count = 1;
31998ef1 2423 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2424 !is_power_of_2(cc->tfms_count)) {
2425 ti->error = "Bad cipher key count specification";
2426 return -EINVAL;
2427 }
2428 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2429
2430 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2431 if (!cc->cipher)
2432 goto bad_mem;
2433
1da177e4 2434 chainmode = strsep(&tmp, "-");
33d2f09f
MB		 2435 *ivopts = strsep(&tmp, "-");
2436 *ivmode = strsep(&*ivopts, ":");
1da177e4
LT		 2437
2438 if (tmp)
5ebaee6d 2439 DMWARN("Ignoring unexpected additional cipher options");
1da177e4 2440
7dbcd137
MB		 2441 /*
2442 * For compatibility with the original dm-crypt mapping format, if
2443 * only the cipher name is supplied, use cbc-plain.
2444 */
33d2f09f 2445 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2446 chainmode = "cbc";
33d2f09f 2447 *ivmode = "plain";
1da177e4
LT		 2448 }
2449
33d2f09f 2450 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2451 ti->error = "IV mechanism required";
2452 return -EINVAL;
1da177e4
LT		 2453 }
2454
5ebaee6d
MB		 2455 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2456 if (!cipher_api)
2457 goto bad_mem;
2458
2459 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2460 "%s(%s)", chainmode, cipher);
2461 if (ret < 0) {
2462 kfree(cipher_api);
2463 goto bad_mem;
1da177e4
LT		 2464 }
2465
5ebaee6d 2466 /* Allocate cipher */
fd2d231f
MP		 2467 ret = crypt_alloc_tfms(cc, cipher_api);
2468 if (ret < 0) {
2469 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2470 kfree(cipher_api);
2471 return ret;
1da177e4 2472 }
1da177e4 2473
33d2f09f
MB		 2474 return 0;
2475bad_mem:
2476 ti->error = "Cannot allocate cipher strings";
2477 return -ENOMEM;
2478}
5ebaee6d 2479
33d2f09f
MB		 2480static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2481{
2482 struct crypt_config *cc = ti->private;
2483 char *ivmode = NULL, *ivopts = NULL;
2484 int ret;
2485
2486 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2487 if (!cc->cipher_string) {
2488 ti->error = "Cannot allocate cipher strings";
2489 return -ENOMEM;
1da177e4
LT		 2490 }
2491
33d2f09f
MB		 2492 if (strstarts(cipher_in, "capi:"))
2493 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2494 else
2495 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2496 if (ret)
2497 return ret;
2498
5ebaee6d 2499 /* Initialize IV */
e889f97a
MB		 2500 ret = crypt_ctr_ivmode(ti, ivmode);
2501 if (ret < 0)
33d2f09f 2502 return ret;
1da177e4 2503
da31a078
MB		 2504 /* Initialize and set key */
2505 ret = crypt_set_key(cc, key);
2506 if (ret < 0) {
2507 ti->error = "Error decoding and setting key";
33d2f09f 2508 return ret;
da31a078
MB		 2509 }
2510
28513fcc
MB		 2511 /* Allocate IV */
2512 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2513 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2514 if (ret < 0) {
2515 ti->error = "Error creating IV";
33d2f09f 2516 return ret;
28513fcc
MB		 2517 }
2518 }
1da177e4 2519
28513fcc
MB		 2520 /* Initialize IV (set keys for ESSIV etc) */
2521 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2522 ret = cc->iv_gen_ops->init(cc);
2523 if (ret < 0) {
2524 ti->error = "Error initialising IV";
33d2f09f 2525 return ret;
28513fcc 2526 }
b95bf2d3
MB		 2527 }
2528
5ebaee6d 2529 return ret;
5ebaee6d 2530}
5ebaee6d 2531
ef43aa38
MB		 2532static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2533{
2534 struct crypt_config *cc = ti->private;
2535 struct dm_arg_set as;
2536 static struct dm_arg _args[] = {
8f0009a2 2537 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2538 };
2539 unsigned int opt_params, val;
2540 const char *opt_string, *sval;
8f0009a2 2541 char dummy;
ef43aa38
MB		 2542 int ret;
2543
2544 /* Optional parameters */
2545 as.argc = argc;
2546 as.argv = argv;
2547
2548 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2549 if (ret)
2550 return ret;
2551
2552 while (opt_params--) {
2553 opt_string = dm_shift_arg(&as);
2554 if (!opt_string) {
2555 ti->error = "Not enough feature arguments";
2556 return -EINVAL;
2557 }
2558
2559 if (!strcasecmp(opt_string, "allow_discards"))
2560 ti->num_discard_bios = 1;
2561
2562 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2563 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2564
2565 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2566 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2567 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2568 if (val == 0 || val > MAX_TAG_SIZE) {
2569 ti->error = "Invalid integrity arguments";
2570 return -EINVAL;
2571 }
2572 cc->on_disk_tag_size = val;
2573 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2574 if (!strcasecmp(sval, "aead")) {
2575 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2576 } else if (strcasecmp(sval, "none")) {
2577 ti->error = "Unknown integrity profile";
2578 return -EINVAL;
2579 }
2580
2581 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2582 if (!cc->cipher_auth)
2583 return -ENOMEM;
ff3af92b 2584 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2585 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2586 cc->sector_size > 4096 ||
ff3af92b 2587 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2588 ti->error = "Invalid feature value for sector_size";
2589 return -EINVAL;
2590 }
ff3af92b 2591 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2592 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2593 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2594 else {
ef43aa38
MB		 2595 ti->error = "Invalid feature arguments";
2596 return -EINVAL;
2597 }
2598 }
2599
2600 return 0;
5ebaee6d
MB		 2601}
2602
2603/*
2604 * Construct an encryption mapping:
c538f6ec 2605 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2606 */
2607static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2608{
2609 struct crypt_config *cc;
c538f6ec 2610 int key_size;
ef43aa38 2611 unsigned int align_mask;
5ebaee6d
MB		 2612 unsigned long long tmpll;
2613 int ret;
ef43aa38 2614 size_t iv_size_padding, additional_req_size;
31998ef1 2615 char dummy;
772ae5f5 2616
772ae5f5 2617 if (argc < 5) {
5ebaee6d
MB		 2618 ti->error = "Not enough arguments";
2619 return -EINVAL;
1da177e4
LT		 2620 }
2621
c538f6ec
OK		 2622 key_size = get_key_size(&argv[1]);
2623 if (key_size < 0) {
2624 ti->error = "Cannot parse key size";
2625 return -EINVAL;
2626 }
5ebaee6d
MB		 2627
2628 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2629 if (!cc) {
2630 ti->error = "Cannot allocate encryption context";
2631 return -ENOMEM;
2632 }
69a8cfcd 2633 cc->key_size = key_size;
8f0009a2 2634 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2635 cc->sector_shift = 0;
5ebaee6d
MB		 2636
2637 ti->private = cc;
ef43aa38
MB		 2638
2639 /* Optional parameters need to be read before cipher constructor */
2640 if (argc > 5) {
2641 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2642 if (ret)
2643 goto bad;
2644 }
2645
5ebaee6d
MB		 2646 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2647 if (ret < 0)
2648 goto bad;
2649
33d2f09f 2650 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2651 cc->dmreq_start = sizeof(struct aead_request);
2652 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2653 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2654 } else {
2655 cc->dmreq_start = sizeof(struct skcipher_request);
2656 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2657 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2658 }
d49ec52f
MP		 2659 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2660
ef43aa38 2661 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2662 /* Allocate the padding exactly */
2663 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2664 & align_mask;
d49ec52f
MP		 2665 } else {
2666 /*
2667 * If the cipher requires greater alignment than kmalloc
2668 * alignment, we don't know the exact position of the
2669 * initialization vector. We must assume worst case.
2670 */
ef43aa38 2671 iv_size_padding = align_mask;
d49ec52f 2672 }
ddd42edf 2673
94f5e024 2674 ret = -ENOMEM;
ef43aa38
MB		 2675
2676 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2677 additional_req_size = sizeof(struct dm_crypt_request) +
2678 iv_size_padding + cc->iv_size +
2679 cc->iv_size +
2680 sizeof(uint64_t) +
2681 sizeof(unsigned int);
2682
2683 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size);
ddd42edf
MB		 2684 if (!cc->req_pool) {
2685 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2686 goto bad;
ddd42edf 2687 }
ddd42edf 2688
30187e1d 2689 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2690 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2691 ARCH_KMALLOC_MINALIGN);
298a9fa0 2692
cf2f1abf 2693 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
1da177e4 2694 if (!cc->page_pool) {
72d94861 2695 ti->error = "Cannot allocate page mempool";
28513fcc 2696 goto bad;
1da177e4
LT		 2697 }
2698
47e0fb46
N		 2699 cc->bs = bioset_create(MIN_IOS, 0, (BIOSET_NEED_BVECS |
2700 BIOSET_NEED_RESCUER));
6a24c718
MB		 2701 if (!cc->bs) {
2702 ti->error = "Cannot allocate crypt bioset";
28513fcc 2703 goto bad;
6a24c718
MB		 2704 }
2705
7145c241
MP		 2706 mutex_init(&cc->bio_alloc_lock);
2707
28513fcc 2708 ret = -EINVAL;
8f0009a2
MB		 2709 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2710 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2711 ti->error = "Invalid iv_offset sector";
28513fcc 2712 goto bad;
1da177e4 2713 }
4ee218cd 2714 cc->iv_offset = tmpll;
1da177e4 2715
e80d1c80
VG		 2716 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2717 if (ret) {
28513fcc
MB		 2718 ti->error = "Device lookup failed";
2719 goto bad;
2720 }
2721
e80d1c80 2722 ret = -EINVAL;
31998ef1 2723 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
72d94861 2724 ti->error = "Invalid device sector";
28513fcc 2725 goto bad;
1da177e4 2726 }
4ee218cd 2727 cc->start = tmpll;
1da177e4 2728
33d2f09f 2729 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2730 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2731 if (ret)
2732 goto bad;
2733
ef43aa38
MB		 2734 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2735 if (!cc->tag_pool_max_sectors)
2736 cc->tag_pool_max_sectors = 1;
f3396c58 2737
ef43aa38
MB		 2738 cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS,
2739 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
2740 if (!cc->tag_pool) {
2741 ti->error = "Cannot allocate integrity tags mempool";
2742 goto bad;
772ae5f5 2743 }
583fe747
MP		 2744
2745 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 2746 }
2747
28513fcc 2748 ret = -ENOMEM;
a1b89132 2749 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
cabf08e4
MB		 2750 if (!cc->io_queue) {
2751 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2752 goto bad;
cabf08e4
MB		 2753 }
2754
f3396c58 2755 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
a1b89132 2756 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
f3396c58 2757 else
a1b89132
TM		 2758 cc->crypt_queue = alloc_workqueue("kcryptd",
2759 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
f3396c58 2760 num_online_cpus());
cabf08e4 2761 if (!cc->crypt_queue) {
9934a8be 2762 ti->error = "Couldn't create kcryptd queue";
28513fcc 2763 goto bad;
9934a8be
MB		 2764 }
2765
dc267621 2766 init_waitqueue_head(&cc->write_thread_wait);
b3c5fd30 2767 cc->write_tree = RB_ROOT;
dc267621
MP		 2768
2769 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
2770 if (IS_ERR(cc->write_thread)) {
2771 ret = PTR_ERR(cc->write_thread);
2772 cc->write_thread = NULL;
2773 ti->error = "Couldn't spawn write thread";
2774 goto bad;
2775 }
2776 wake_up_process(cc->write_thread);
2777
55a62eef 2778 ti->num_flush_bios = 1;
983c7db3 2779
1da177e4
LT		 2780 return 0;
2781
28513fcc
MB		 2782bad:
2783 crypt_dtr(ti);
2784 return ret;
1da177e4
LT		 2785}
2786
7de3ee57 2787static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2788{
028867ac 2789 struct dm_crypt_io *io;
49a8a920 2790 struct crypt_config *cc = ti->private;
647c7db1 2791
772ae5f5 2792 /*
28a8f0d3
MC		 2793 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2794 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2795 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2796 */
1eff9d32 2797 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2798 bio_op(bio) == REQ_OP_DISCARD)) {
647c7db1 2799 bio->bi_bdev = cc->dev->bdev;
772ae5f5 2800 if (bio_sectors(bio))
4f024f37
KO		 2801 bio->bi_iter.bi_sector = cc->start +
2802 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2803 return DM_MAPIO_REMAPPED;
2804 }
1da177e4 2805
4e870e94
MP		 2806 /*
2807 * Check if bio is too large, split as needed.
2808 */
2809 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2810 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2811 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2812
8f0009a2
MB		 2813 /*
2814 * Ensure that bio is a multiple of internal sector encryption size
2815 * and is aligned to this size as defined in IO hints.
2816 */
2817 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 2818 return DM_MAPIO_KILL;
8f0009a2
MB		 2819
2820 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 2821 return DM_MAPIO_KILL;
8f0009a2 2822
298a9fa0
MP		 2823 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2824 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2825
2826 if (cc->on_disk_tag_size) {
583fe747 2827 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 2828
2829 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 2830 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 2831 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2832 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2833 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
2834 io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO);
2835 io->integrity_metadata_from_pool = true;
2836 }
2837 }
2838
33d2f09f 2839 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2840 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2841 else
2842 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2843
20c82538
MB		 2844 if (bio_data_dir(io->base_bio) == READ) {
2845 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2846 kcryptd_queue_read(io);
20c82538 2847 } else
cabf08e4 2848 kcryptd_queue_crypt(io);
1da177e4 2849
d2a7ad29 2850 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2851}
2852
fd7c092e
MP		 2853static void crypt_status(struct dm_target *ti, status_type_t type,
2854 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2855{
5ebaee6d 2856 struct crypt_config *cc = ti->private;
fd7c092e 2857 unsigned i, sz = 0;
f3396c58 2858 int num_feature_args = 0;
1da177e4
LT		 2859
2860 switch (type) {
2861 case STATUSTYPE_INFO:
2862 result[0] = '\0';
2863 break;
2864
2865 case STATUSTYPE_TABLE:
7dbcd137 2866 DMEMIT("%s ", cc->cipher_string);
1da177e4 2867
c538f6ec
OK		 2868 if (cc->key_size > 0) {
2869 if (cc->key_string)
2870 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2871 else
2872 for (i = 0; i < cc->key_size; i++)
2873 DMEMIT("%02x", cc->key[i]);
2874 } else
fd7c092e 2875 DMEMIT("-");
1da177e4 2876
4ee218cd
AM		 2877 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2878 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2879
f3396c58
MP		 2880 num_feature_args += !!ti->num_discard_bios;
2881 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2882 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2883 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2884 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2885 if (cc->on_disk_tag_size)
2886 num_feature_args++;
f3396c58
MP		 2887 if (num_feature_args) {
2888 DMEMIT(" %d", num_feature_args);
2889 if (ti->num_discard_bios)
2890 DMEMIT(" allow_discards");
2891 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2892 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2893 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2894 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2895 if (cc->on_disk_tag_size)
2896 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2897 if (cc->sector_size != (1 << SECTOR_SHIFT))
2898 DMEMIT(" sector_size:%d", cc->sector_size);
2899 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2900 DMEMIT(" iv_large_sectors");
f3396c58 2901 }
772ae5f5 2902
1da177e4
LT		 2903 break;
2904 }
1da177e4
LT		 2905}
2906
e48d4bbf
MB		 2907static void crypt_postsuspend(struct dm_target *ti)
2908{
2909 struct crypt_config *cc = ti->private;
2910
2911 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2912}
2913
2914static int crypt_preresume(struct dm_target *ti)
2915{
2916 struct crypt_config *cc = ti->private;
2917
2918 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
2919 DMERR("aborting resume - crypt key is not set.");
2920 return -EAGAIN;
2921 }
2922
2923 return 0;
2924}
2925
2926static void crypt_resume(struct dm_target *ti)
2927{
2928 struct crypt_config *cc = ti->private;
2929
2930 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2931}
2932
2933/* Message interface
2934 * key set <key>
2935 * key wipe
2936 */
2937static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2938{
2939 struct crypt_config *cc = ti->private;
c538f6ec 2940 int key_size, ret = -EINVAL;
e48d4bbf
MB		 2941
2942 if (argc < 2)
2943 goto error;
2944
498f0103 2945 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 2946 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2947 DMWARN("not suspended during key manipulation.");
2948 return -EINVAL;
2949 }
498f0103 2950 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 2951 /* The key size may not be changed. */
2952 key_size = get_key_size(&argv[2]);
2953 if (key_size < 0 || cc->key_size != key_size) {
2954 memset(argv[2], '0', strlen(argv[2]));
2955 return -EINVAL;
2956 }
2957
542da317
MB		 2958 ret = crypt_set_key(cc, argv[2]);
2959 if (ret)
2960 return ret;
2961 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2962 ret = cc->iv_gen_ops->init(cc);
2963 return ret;
2964 }
498f0103 2965 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 2966 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2967 ret = cc->iv_gen_ops->wipe(cc);
2968 if (ret)
2969 return ret;
2970 }
e48d4bbf 2971 return crypt_wipe_key(cc);
542da317 2972 }
e48d4bbf
MB		 2973 }
2974
2975error:
2976 DMWARN("unrecognised message received.");
2977 return -EINVAL;
2978}
2979
af4874e0
MS		 2980static int crypt_iterate_devices(struct dm_target *ti,
2981 iterate_devices_callout_fn fn, void *data)
2982{
2983 struct crypt_config *cc = ti->private;
2984
5dea271b 2985 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 2986}
2987
586b286b
MS		 2988static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
2989{
8f0009a2
MB		 2990 struct crypt_config *cc = ti->private;
2991
586b286b
MS		 2992 /*
2993 * Unfortunate constraint that is required to avoid the potential
2994 * for exceeding underlying device's max_segments limits -- due to
2995 * crypt_alloc_buffer() possibly allocating pages for the encryption
2996 * bio that are not as physically contiguous as the original bio.
2997 */
2998 limits->max_segment_size = PAGE_SIZE;
8f0009a2
MB		 2999
3000 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
3001 limits->logical_block_size = cc->sector_size;
3002 limits->physical_block_size = cc->sector_size;
3003 blk_limits_io_min(limits, cc->sector_size);
3004 }
586b286b
MS		 3005}
3006
1da177e4
LT		 3007static struct target_type crypt_target = {
3008 .name = "crypt",
7e3fd855 3009 .version = {1, 18, 0},
1da177e4
LT		 3010 .module = THIS_MODULE,
3011 .ctr = crypt_ctr,
3012 .dtr = crypt_dtr,
3013 .map = crypt_map,
3014 .status = crypt_status,
e48d4bbf
MB		 3015 .postsuspend = crypt_postsuspend,
3016 .preresume = crypt_preresume,
3017 .resume = crypt_resume,
3018 .message = crypt_message,
af4874e0 3019 .iterate_devices = crypt_iterate_devices,
586b286b 3020 .io_hints = crypt_io_hints,
1da177e4
LT		 3021};
3022
3023static int __init dm_crypt_init(void)
3024{
3025 int r;
3026
1da177e4 3027 r = dm_register_target(&crypt_target);
94f5e024 3028 if (r < 0)
72d94861 3029 DMERR("register failed %d", r);
1da177e4 3030
1da177e4
LT		 3031 return r;
3032}
3033
3034static void __exit dm_crypt_exit(void)
3035{
10d3bd09 3036 dm_unregister_target(&crypt_target);
1da177e4
LT		 3037}
3038
3039module_init(dm_crypt_init);
3040module_exit(dm_crypt_exit);
3041
bf14299f 3042MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3043MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3044MODULE_LICENSE("GPL");
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