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dm: fix dropped return code from dm_get_bdev_for_ioctl
[linux-2.6-block.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
ef43aa38
MB		 4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 6 *
7 * This file is released under the GPL.
8 */
9
43d69034 10#include <linux/completion.h>
d1806f6a 11#include <linux/err.h>
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
c538f6ec 15#include <linux/key.h>
1da177e4
LT		 16#include <linux/bio.h>
17#include <linux/blkdev.h>
18#include <linux/mempool.h>
19#include <linux/slab.h>
20#include <linux/crypto.h>
21#include <linux/workqueue.h>
dc267621 22#include <linux/kthread.h>
3fcfab16 23#include <linux/backing-dev.h>
60063497 24#include <linux/atomic.h>
378f058c 25#include <linux/scatterlist.h>
b3c5fd30 26#include <linux/rbtree.h>
027c431c 27#include <linux/ctype.h>
1da177e4 28#include <asm/page.h>
48527fa7 29#include <asm/unaligned.h>
34745785
MB		 30#include <crypto/hash.h>
31#include <crypto/md5.h>
32#include <crypto/algapi.h>
bbdb23b5 33#include <crypto/skcipher.h>
ef43aa38
MB		 34#include <crypto/aead.h>
35#include <crypto/authenc.h>
36#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
c538f6ec 37#include <keys/user-type.h>
1da177e4 38
586e80e6 39#include <linux/device-mapper.h>
1da177e4 40
72d94861 41#define DM_MSG_PREFIX "crypt"
1da177e4 42
1da177e4
LT		 43/*
44 * context holding the current state of a multi-part conversion
45 */
46struct convert_context {
43d69034 47 struct completion restart;
1da177e4
LT		 48 struct bio *bio_in;
49 struct bio *bio_out;
003b5c57
KO		 50 struct bvec_iter iter_in;
51 struct bvec_iter iter_out;
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 */
45fe93df
AB		 761 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
762 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 763
764 /* calculate crc32 for every 32bit part and xor it */
b6106265
JSM		 765 desc->tfm = tcw->crc32_tfm;
766 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ed04d981 767 for (i = 0; i < 4; i++) {
b6106265 768 r = crypto_shash_init(desc);
ed04d981
MB		 769 if (r)
770 goto out;
b6106265 771 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 772 if (r)
773 goto out;
b6106265 774 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 775 if (r)
776 goto out;
777 }
778 crypto_xor(&buf[0], &buf[12], 4);
779 crypto_xor(&buf[4], &buf[8], 4);
780
781 /* apply whitening (8 bytes) to whole sector */
782 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
783 crypto_xor(data + i * 8, buf, 8);
784out:
1a71d6ff 785 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 786 return r;
787}
788
789static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
790 struct dm_crypt_request *dmreq)
791{
ef43aa38 792 struct scatterlist *sg;
ed04d981 793 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 794 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 795 u8 *src;
796 int r = 0;
797
798 /* Remove whitening from ciphertext */
799 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 800 sg = crypt_get_sg_data(cc, dmreq->sg_in);
801 src = kmap_atomic(sg_page(sg));
802 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 803 kunmap_atomic(src);
804 }
805
806 /* Calculate IV */
45fe93df 807 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 808 if (cc->iv_size > 8)
45fe93df
AB		 809 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
810 cc->iv_size - 8);
ed04d981
MB		 811
812 return r;
813}
814
815static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
816 struct dm_crypt_request *dmreq)
817{
ef43aa38 818 struct scatterlist *sg;
ed04d981
MB		 819 u8 *dst;
820 int r;
821
822 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
823 return 0;
824
825 /* Apply whitening on ciphertext */
ef43aa38
MB		 826 sg = crypt_get_sg_data(cc, dmreq->sg_out);
827 dst = kmap_atomic(sg_page(sg));
828 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 829 kunmap_atomic(dst);
830
831 return r;
832}
833
ef43aa38
MB		 834static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
835 struct dm_crypt_request *dmreq)
836{
837 /* Used only for writes, there must be an additional space to store IV */
838 get_random_bytes(iv, cc->iv_size);
839 return 0;
840}
841
1b1b58f5 842static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 843 .generator = crypt_iv_plain_gen
844};
845
1b1b58f5 846static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 847 .generator = crypt_iv_plain64_gen
848};
849
7e3fd855
MB		 850static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
851 .generator = crypt_iv_plain64be_gen
852};
853
1b1b58f5 854static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 855 .ctr = crypt_iv_essiv_ctr,
856 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 857 .init = crypt_iv_essiv_init,
542da317 858 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 859 .generator = crypt_iv_essiv_gen
860};
861
1b1b58f5 862static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 863 .ctr = crypt_iv_benbi_ctr,
864 .dtr = crypt_iv_benbi_dtr,
865 .generator = crypt_iv_benbi_gen
866};
1da177e4 867
1b1b58f5 868static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 869 .generator = crypt_iv_null_gen
870};
871
1b1b58f5 872static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 873 .ctr = crypt_iv_lmk_ctr,
874 .dtr = crypt_iv_lmk_dtr,
875 .init = crypt_iv_lmk_init,
876 .wipe = crypt_iv_lmk_wipe,
877 .generator = crypt_iv_lmk_gen,
878 .post = crypt_iv_lmk_post
879};
880
1b1b58f5 881static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 882 .ctr = crypt_iv_tcw_ctr,
883 .dtr = crypt_iv_tcw_dtr,
884 .init = crypt_iv_tcw_init,
885 .wipe = crypt_iv_tcw_wipe,
886 .generator = crypt_iv_tcw_gen,
887 .post = crypt_iv_tcw_post
888};
889
ef43aa38
MB		 890static struct crypt_iv_operations crypt_iv_random_ops = {
891 .generator = crypt_iv_random_gen
892};
893
894/*
895 * Integrity extensions
896 */
897static bool crypt_integrity_aead(struct crypt_config *cc)
898{
899 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
900}
901
902static bool crypt_integrity_hmac(struct crypt_config *cc)
903{
33d2f09f 904 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 905}
906
907/* Get sg containing data */
908static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
909 struct scatterlist *sg)
910{
33d2f09f 911 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 912 return &sg[2];
913
914 return sg;
915}
916
917static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
918{
919 struct bio_integrity_payload *bip;
920 unsigned int tag_len;
921 int ret;
922
923 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
924 return 0;
925
926 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
927 if (IS_ERR(bip))
928 return PTR_ERR(bip);
929
930 tag_len = io->cc->on_disk_tag_size * bio_sectors(bio);
931
932 bip->bip_iter.bi_size = tag_len;
933 bip->bip_iter.bi_sector = io->cc->start + io->sector;
934
ef43aa38
MB		 935 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
936 tag_len, offset_in_page(io->integrity_metadata));
937 if (unlikely(ret != tag_len))
938 return -ENOMEM;
939
940 return 0;
941}
942
943static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
944{
945#ifdef CONFIG_BLK_DEV_INTEGRITY
946 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
947
948 /* From now we require underlying device with our integrity profile */
949 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
950 ti->error = "Integrity profile not supported.";
951 return -EINVAL;
952 }
953
583fe747
MP		 954 if (bi->tag_size != cc->on_disk_tag_size ||
955 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 956 ti->error = "Integrity profile tag size mismatch.";
957 return -EINVAL;
958 }
583fe747
MP		 959 if (1 << bi->interval_exp != cc->sector_size) {
960 ti->error = "Integrity profile sector size mismatch.";
961 return -EINVAL;
962 }
ef43aa38 963
33d2f09f 964 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 965 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
966 DMINFO("Integrity AEAD, tag size %u, IV size %u.",
967 cc->integrity_tag_size, cc->integrity_iv_size);
968
969 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
970 ti->error = "Integrity AEAD auth tag size is not supported.";
971 return -EINVAL;
972 }
973 } else if (cc->integrity_iv_size)
974 DMINFO("Additional per-sector space %u bytes for IV.",
975 cc->integrity_iv_size);
976
977 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
978 ti->error = "Not enough space for integrity tag in the profile.";
979 return -EINVAL;
980 }
981
982 return 0;
983#else
984 ti->error = "Integrity profile not supported.";
985 return -EINVAL;
986#endif
987}
988
d469f841
MB		 989static void crypt_convert_init(struct crypt_config *cc,
990 struct convert_context *ctx,
991 struct bio *bio_out, struct bio *bio_in,
fcd369da 992 sector_t sector)
1da177e4
LT		 993{
994 ctx->bio_in = bio_in;
995 ctx->bio_out = bio_out;
003b5c57
KO		 996 if (bio_in)
997 ctx->iter_in = bio_in->bi_iter;
998 if (bio_out)
999 ctx->iter_out = bio_out->bi_iter;
c66029f4 1000 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1001 init_completion(&ctx->restart);
1da177e4
LT		 1002}
1003
b2174eeb 1004static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1005 void *req)
b2174eeb
HY		 1006{
1007 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1008}
1009
ef43aa38 1010static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1011{
ef43aa38 1012 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1013}
1014
2dc5327d
MB		 1015static u8 *iv_of_dmreq(struct crypt_config *cc,
1016 struct dm_crypt_request *dmreq)
1017{
33d2f09f 1018 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1019 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1020 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1021 else
1022 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1023 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1024}
1025
ef43aa38
MB		 1026static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1027 struct dm_crypt_request *dmreq)
1028{
1029 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1030}
1031
1032static uint64_t *org_sector_of_dmreq(struct crypt_config *cc,
1033 struct dm_crypt_request *dmreq)
1034{
1035 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
1036 return (uint64_t*) ptr;
1037}
1038
1039static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1040 struct dm_crypt_request *dmreq)
1041{
1042 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1043 cc->iv_size + sizeof(uint64_t);
1044 return (unsigned int*)ptr;
1045}
1046
1047static void *tag_from_dmreq(struct crypt_config *cc,
1048 struct dm_crypt_request *dmreq)
1049{
1050 struct convert_context *ctx = dmreq->ctx;
1051 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1052
1053 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1054 cc->on_disk_tag_size];
1055}
1056
1057static void *iv_tag_from_dmreq(struct crypt_config *cc,
1058 struct dm_crypt_request *dmreq)
1059{
1060 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1061}
1062
1063static int crypt_convert_block_aead(struct crypt_config *cc,
1064 struct convert_context *ctx,
1065 struct aead_request *req,
1066 unsigned int tag_offset)
01482b76 1067{
003b5c57
KO		 1068 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1069 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1070 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1071 u8 *iv, *org_iv, *tag_iv, *tag;
1072 uint64_t *sector;
1073 int r = 0;
1074
1075 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1076
8f0009a2 1077 /* Reject unexpected unaligned bio. */
0440d5c0 1078 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1079 return -EIO;
3a7f6c99 1080
b2174eeb 1081 dmreq = dmreq_of_req(cc, req);
ef43aa38 1082 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1083 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1084 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1085 dmreq->ctx = ctx;
1086
1087 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1088
1089 sector = org_sector_of_dmreq(cc, dmreq);
1090 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1091
2dc5327d 1092 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1093 org_iv = org_iv_of_dmreq(cc, dmreq);
1094 tag = tag_from_dmreq(cc, dmreq);
1095 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1096
1097 /* AEAD request:
1098 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1099 * | (authenticated) | (auth+encryption) | |
1100 * | sector_LE | IV | sector in/out | tag in/out |
1101 */
1102 sg_init_table(dmreq->sg_in, 4);
1103 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1104 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1105 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1106 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1107
1108 sg_init_table(dmreq->sg_out, 4);
1109 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1110 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1111 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1112 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1113
1114 if (cc->iv_gen_ops) {
1115 /* For READs use IV stored in integrity metadata */
1116 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1117 memcpy(org_iv, tag_iv, cc->iv_size);
1118 } else {
1119 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1120 if (r < 0)
1121 return r;
1122 /* Store generated IV in integrity metadata */
1123 if (cc->integrity_iv_size)
1124 memcpy(tag_iv, org_iv, cc->iv_size);
1125 }
1126 /* Working copy of IV, to be modified in crypto API */
1127 memcpy(iv, org_iv, cc->iv_size);
1128 }
1129
1130 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1131 if (bio_data_dir(ctx->bio_in) == WRITE) {
1132 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1133 cc->sector_size, iv);
ef43aa38
MB		 1134 r = crypto_aead_encrypt(req);
1135 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1136 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1137 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1138 } else {
1139 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1140 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1141 r = crypto_aead_decrypt(req);
1142 }
1143
1144 if (r == -EBADMSG)
1145 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1146 (unsigned long long)le64_to_cpu(*sector));
1147
1148 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1149 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1150
8f0009a2
MB		 1151 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1152 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1153
ef43aa38
MB		 1154 return r;
1155}
1156
1157static int crypt_convert_block_skcipher(struct crypt_config *cc,
1158 struct convert_context *ctx,
1159 struct skcipher_request *req,
1160 unsigned int tag_offset)
1161{
1162 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1163 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1164 struct scatterlist *sg_in, *sg_out;
1165 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1166 u8 *iv, *org_iv, *tag_iv;
1167 uint64_t *sector;
1168 int r = 0;
01482b76 1169
8f0009a2 1170 /* Reject unexpected unaligned bio. */
0440d5c0 1171 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1172 return -EIO;
1173
ef43aa38 1174 dmreq = dmreq_of_req(cc, req);
c66029f4 1175 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1176 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1177 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1178 dmreq->ctx = ctx;
01482b76 1179
ef43aa38
MB		 1180 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1181
1182 iv = iv_of_dmreq(cc, dmreq);
1183 org_iv = org_iv_of_dmreq(cc, dmreq);
1184 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1185
1186 sector = org_sector_of_dmreq(cc, dmreq);
1187 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1188
1189 /* For skcipher we use only the first sg item */
1190 sg_in = &dmreq->sg_in[0];
1191 sg_out = &dmreq->sg_out[0];
01482b76 1192
ef43aa38 1193 sg_init_table(sg_in, 1);
8f0009a2 1194 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1195
1196 sg_init_table(sg_out, 1);
8f0009a2 1197 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1198
3a7f6c99 1199 if (cc->iv_gen_ops) {
ef43aa38
MB		 1200 /* For READs use IV stored in integrity metadata */
1201 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1202 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1203 } else {
1204 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1205 if (r < 0)
1206 return r;
1207 /* Store generated IV in integrity metadata */
1208 if (cc->integrity_iv_size)
1209 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1210 }
1211 /* Working copy of IV, to be modified in crypto API */
1212 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1213 }
1214
8f0009a2 1215 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1216
1217 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1218 r = crypto_skcipher_encrypt(req);
3a7f6c99 1219 else
bbdb23b5 1220 r = crypto_skcipher_decrypt(req);
3a7f6c99 1221
2dc5327d 1222 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1223 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1224
8f0009a2
MB		 1225 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1226 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1227
3a7f6c99 1228 return r;
01482b76
MB		 1229}
1230
95497a96
MB		 1231static void kcryptd_async_done(struct crypto_async_request *async_req,
1232 int error);
c0297721 1233
ef43aa38
MB		 1234static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1235 struct convert_context *ctx)
ddd42edf 1236{
c66029f4 1237 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1238
ef43aa38
MB		 1239 if (!ctx->r.req)
1240 ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1241
ef43aa38 1242 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1243
1244 /*
1245 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1246 * requests if driver request queue is full.
1247 */
ef43aa38 1248 skcipher_request_set_callback(ctx->r.req,
c0297721 1249 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38 1250 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
ddd42edf
MB		 1251}
1252
ef43aa38
MB		 1253static void crypt_alloc_req_aead(struct crypt_config *cc,
1254 struct convert_context *ctx)
1255{
1256 if (!ctx->r.req_aead)
1257 ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1258
ef43aa38 1259 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1260
1261 /*
1262 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1263 * requests if driver request queue is full.
1264 */
ef43aa38 1265 aead_request_set_callback(ctx->r.req_aead,
c0297721 1266 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38
MB		 1267 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1268}
1269
1270static void crypt_alloc_req(struct crypt_config *cc,
1271 struct convert_context *ctx)
1272{
33d2f09f 1273 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1274 crypt_alloc_req_aead(cc, ctx);
1275 else
1276 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1277}
1278
ef43aa38
MB		 1279static void crypt_free_req_skcipher(struct crypt_config *cc,
1280 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1281{
1282 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1283
bbdb23b5 1284 if ((struct skcipher_request *)(io + 1) != req)
298a9fa0
MP		 1285 mempool_free(req, cc->req_pool);
1286}
1287
ef43aa38
MB		 1288static void crypt_free_req_aead(struct crypt_config *cc,
1289 struct aead_request *req, struct bio *base_bio)
1290{
1291 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1292
1293 if ((struct aead_request *)(io + 1) != req)
1294 mempool_free(req, cc->req_pool);
1295}
1296
1297static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1298{
33d2f09f 1299 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1300 crypt_free_req_aead(cc, req, base_bio);
1301 else
1302 crypt_free_req_skcipher(cc, req, base_bio);
1303}
1304
1da177e4
LT		 1305/*
1306 * Encrypt / decrypt data from one bio to another one (can be the same one)
1307 */
4e4cbee9 1308static blk_status_t crypt_convert(struct crypt_config *cc,
d469f841 1309 struct convert_context *ctx)
1da177e4 1310{
ef43aa38 1311 unsigned int tag_offset = 0;
ff3af92b 1312 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1313 int r;
1da177e4 1314
40b6229b 1315 atomic_set(&ctx->cc_pending, 1);
c8081618 1316
003b5c57 1317 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1318
3a7f6c99 1319 crypt_alloc_req(cc, ctx);
40b6229b 1320 atomic_inc(&ctx->cc_pending);
3f1e9070 1321
33d2f09f 1322 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1323 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1324 else
1325 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1326
1327 switch (r) {
54cea3f6
MB		 1328 /*
1329 * The request was queued by a crypto driver
1330 * but the driver request queue is full, let's wait.
1331 */
3a7f6c99
MB		 1332 case -EBUSY:
1333 wait_for_completion(&ctx->restart);
16735d02 1334 reinit_completion(&ctx->restart);
54cea3f6
MB		 1335 /* fall through */
1336 /*
1337 * The request is queued and processed asynchronously,
1338 * completion function kcryptd_async_done() will be called.
1339 */
c0403ec0 1340 case -EINPROGRESS:
ef43aa38 1341 ctx->r.req = NULL;
8f0009a2 1342 ctx->cc_sector += sector_step;
583fe747 1343 tag_offset++;
3f1e9070 1344 continue;
54cea3f6
MB		 1345 /*
1346 * The request was already processed (synchronously).
1347 */
3a7f6c99 1348 case 0:
40b6229b 1349 atomic_dec(&ctx->cc_pending);
8f0009a2 1350 ctx->cc_sector += sector_step;
583fe747 1351 tag_offset++;
c7f1b204 1352 cond_resched();
3a7f6c99 1353 continue;
ef43aa38
MB		 1354 /*
1355 * There was a data integrity error.
1356 */
1357 case -EBADMSG:
1358 atomic_dec(&ctx->cc_pending);
4e4cbee9 1359 return BLK_STS_PROTECTION;
ef43aa38
MB		 1360 /*
1361 * There was an error while processing the request.
1362 */
3f1e9070 1363 default:
40b6229b 1364 atomic_dec(&ctx->cc_pending);
4e4cbee9 1365 return BLK_STS_IOERR;
3f1e9070 1366 }
1da177e4
LT		 1367 }
1368
3f1e9070 1369 return 0;
1da177e4
LT		 1370}
1371
cf2f1abf
MP		 1372static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1373
1da177e4
LT		 1374/*
1375 * Generate a new unfragmented bio with the given size
586b286b
MS		 1376 * This should never violate the device limitations (but only because
1377 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1378 *
1379 * This function may be called concurrently. If we allocate from the mempool
1380 * concurrently, there is a possibility of deadlock. For example, if we have
1381 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1382 * the mempool concurrently, it may deadlock in a situation where both processes
1383 * have allocated 128 pages and the mempool is exhausted.
1384 *
1385 * In order to avoid this scenario we allocate the pages under a mutex.
1386 *
1387 * In order to not degrade performance with excessive locking, we try
1388 * non-blocking allocations without a mutex first but on failure we fallback
1389 * to blocking allocations with a mutex.
1da177e4 1390 */
cf2f1abf 1391static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1392{
49a8a920 1393 struct crypt_config *cc = io->cc;
8b004457 1394 struct bio *clone;
1da177e4 1395 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1396 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1397 unsigned i, len, remaining_size;
91e10625 1398 struct page *page;
1da177e4 1399
7145c241 1400retry:
d0164adc 1401 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1402 mutex_lock(&cc->bio_alloc_lock);
1403
2f9941b6 1404 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
8b004457 1405 if (!clone)
ef43aa38 1406 goto out;
1da177e4 1407
027581f3 1408 clone_init(io, clone);
6a24c718 1409
7145c241
MP		 1410 remaining_size = size;
1411
f97380bc 1412 for (i = 0; i < nr_iovecs; i++) {
91e10625 1413 page = mempool_alloc(cc->page_pool, gfp_mask);
7145c241
MP		 1414 if (!page) {
1415 crypt_free_buffer_pages(cc, clone);
1416 bio_put(clone);
d0164adc 1417 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1418 goto retry;
1419 }
1da177e4 1420
7145c241 1421 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1422
0dae7fe5 1423 bio_add_page(clone, page, len, 0);
1da177e4 1424
7145c241 1425 remaining_size -= len;
1da177e4
LT		 1426 }
1427
ef43aa38
MB		 1428 /* Allocate space for integrity tags */
1429 if (dm_crypt_integrity_io_alloc(io, clone)) {
1430 crypt_free_buffer_pages(cc, clone);
1431 bio_put(clone);
1432 clone = NULL;
1433 }
1434out:
d0164adc 1435 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1436 mutex_unlock(&cc->bio_alloc_lock);
1437
8b004457 1438 return clone;
1da177e4
LT		 1439}
1440
644bd2f0 1441static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1442{
644bd2f0 1443 unsigned int i;
1da177e4
LT		 1444 struct bio_vec *bv;
1445
cb34e057 1446 bio_for_each_segment_all(bv, clone, i) {
1da177e4
LT		 1447 BUG_ON(!bv->bv_page);
1448 mempool_free(bv->bv_page, cc->page_pool);
1da177e4
LT		 1449 }
1450}
1451
298a9fa0
MP		 1452static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1453 struct bio *bio, sector_t sector)
dc440d1e 1454{
49a8a920 1455 io->cc = cc;
dc440d1e
MB		 1456 io->base_bio = bio;
1457 io->sector = sector;
1458 io->error = 0;
ef43aa38
MB		 1459 io->ctx.r.req = NULL;
1460 io->integrity_metadata = NULL;
1461 io->integrity_metadata_from_pool = false;
40b6229b 1462 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1463}
1464
3e1a8bdd
MB		 1465static void crypt_inc_pending(struct dm_crypt_io *io)
1466{
40b6229b 1467 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1468}
1469
1da177e4
LT		 1470/*
1471 * One of the bios was finished. Check for completion of
1472 * the whole request and correctly clean up the buffer.
1473 */
5742fd77 1474static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1475{
49a8a920 1476 struct crypt_config *cc = io->cc;
b35f8caa 1477 struct bio *base_bio = io->base_bio;
4e4cbee9 1478 blk_status_t error = io->error;
1da177e4 1479
40b6229b 1480 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1481 return;
1482
ef43aa38
MB		 1483 if (io->ctx.r.req)
1484 crypt_free_req(cc, io->ctx.r.req, base_bio);
1485
1486 if (unlikely(io->integrity_metadata_from_pool))
1487 mempool_free(io->integrity_metadata, io->cc->tag_pool);
1488 else
1489 kfree(io->integrity_metadata);
b35f8caa 1490
4e4cbee9 1491 base_bio->bi_status = error;
4246a0b6 1492 bio_endio(base_bio);
1da177e4
LT		 1493}
1494
1495/*
cabf08e4 1496 * kcryptd/kcryptd_io:
1da177e4
LT		 1497 *
1498 * Needed because it would be very unwise to do decryption in an
23541d2d 1499 * interrupt context.
cabf08e4
MB		 1500 *
1501 * kcryptd performs the actual encryption or decryption.
1502 *
1503 * kcryptd_io performs the IO submission.
1504 *
1505 * They must be separated as otherwise the final stages could be
1506 * starved by new requests which can block in the first stages due
1507 * to memory allocation.
c0297721
AK		 1508 *
1509 * The work is done per CPU global for all dm-crypt instances.
1510 * They should not depend on each other and do not block.
1da177e4 1511 */
4246a0b6 1512static void crypt_endio(struct bio *clone)
8b004457 1513{
028867ac 1514 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1515 struct crypt_config *cc = io->cc;
ee7a491e 1516 unsigned rw = bio_data_dir(clone);
4e4cbee9 1517 blk_status_t error;
8b004457
MB		 1518
1519 /*
6712ecf8 1520 * free the processed pages
8b004457 1521 */
ee7a491e 1522 if (rw == WRITE)
644bd2f0 1523 crypt_free_buffer_pages(cc, clone);
8b004457 1524
4e4cbee9 1525 error = clone->bi_status;
8b004457 1526 bio_put(clone);
8b004457 1527
9b81c842 1528 if (rw == READ && !error) {
ee7a491e
MB		 1529 kcryptd_queue_crypt(io);
1530 return;
1531 }
5742fd77 1532
9b81c842
SL		 1533 if (unlikely(error))
1534 io->error = error;
5742fd77
MB		 1535
1536 crypt_dec_pending(io);
8b004457
MB		 1537}
1538
028867ac 1539static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1540{
49a8a920 1541 struct crypt_config *cc = io->cc;
8b004457
MB		 1542
1543 clone->bi_private = io;
1544 clone->bi_end_io = crypt_endio;
74d46992 1545 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1546 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1547}
1548
20c82538 1549static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1550{
49a8a920 1551 struct crypt_config *cc = io->cc;
8b004457 1552 struct bio *clone;
93e605c2 1553
8b004457 1554 /*
59779079
MS		 1555 * We need the original biovec array in order to decrypt
1556 * the whole bio data *afterwards* -- thanks to immutable
1557 * biovecs we don't need to worry about the block layer
1558 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1559 */
59779079 1560 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
7eaceacc 1561 if (!clone)
20c82538 1562 return 1;
8b004457 1563
20c82538
MB		 1564 crypt_inc_pending(io);
1565
8b004457 1566 clone_init(io, clone);
4f024f37 1567 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1568
ef43aa38
MB		 1569 if (dm_crypt_integrity_io_alloc(io, clone)) {
1570 crypt_dec_pending(io);
1571 bio_put(clone);
1572 return 1;
1573 }
1574
93e605c2 1575 generic_make_request(clone);
20c82538 1576 return 0;
8b004457
MB		 1577}
1578
dc267621
MP		 1579static void kcryptd_io_read_work(struct work_struct *work)
1580{
1581 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1582
1583 crypt_inc_pending(io);
1584 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1585 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1586 crypt_dec_pending(io);
1587}
1588
1589static void kcryptd_queue_read(struct dm_crypt_io *io)
1590{
1591 struct crypt_config *cc = io->cc;
1592
1593 INIT_WORK(&io->work, kcryptd_io_read_work);
1594 queue_work(cc->io_queue, &io->work);
1595}
1596
4e4eef64
MB		 1597static void kcryptd_io_write(struct dm_crypt_io *io)
1598{
95497a96 1599 struct bio *clone = io->ctx.bio_out;
dc267621 1600
95497a96 1601 generic_make_request(clone);
4e4eef64
MB		 1602}
1603
b3c5fd30
MP		 1604#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1605
dc267621 1606static int dmcrypt_write(void *data)
395b167c 1607{
dc267621 1608 struct crypt_config *cc = data;
b3c5fd30
MP		 1609 struct dm_crypt_io *io;
1610
dc267621 1611 while (1) {
b3c5fd30 1612 struct rb_root write_tree;
dc267621 1613 struct blk_plug plug;
395b167c 1614
dc267621 1615 DECLARE_WAITQUEUE(wait, current);
395b167c 1616
dc267621
MP		 1617 spin_lock_irq(&cc->write_thread_wait.lock);
1618continue_locked:
395b167c 1619
b3c5fd30 1620 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1621 goto pop_from_list;
1622
f659b100 1623 set_current_state(TASK_INTERRUPTIBLE);
dc267621
MP		 1624 __add_wait_queue(&cc->write_thread_wait, &wait);
1625
1626 spin_unlock_irq(&cc->write_thread_wait.lock);
1627
f659b100 1628 if (unlikely(kthread_should_stop())) {
642fa448 1629 set_current_state(TASK_RUNNING);
f659b100
RV		 1630 remove_wait_queue(&cc->write_thread_wait, &wait);
1631 break;
1632 }
1633
dc267621
MP		 1634 schedule();
1635
642fa448 1636 set_current_state(TASK_RUNNING);
dc267621
MP		 1637 spin_lock_irq(&cc->write_thread_wait.lock);
1638 __remove_wait_queue(&cc->write_thread_wait, &wait);
1639 goto continue_locked;
1640
1641pop_from_list:
b3c5fd30
MP		 1642 write_tree = cc->write_tree;
1643 cc->write_tree = RB_ROOT;
dc267621
MP		 1644 spin_unlock_irq(&cc->write_thread_wait.lock);
1645
b3c5fd30
MP		 1646 BUG_ON(rb_parent(write_tree.rb_node));
1647
1648 /*
1649 * Note: we cannot walk the tree here with rb_next because
1650 * the structures may be freed when kcryptd_io_write is called.
1651 */
dc267621
MP		 1652 blk_start_plug(&plug);
1653 do {
b3c5fd30
MP		 1654 io = crypt_io_from_node(rb_first(&write_tree));
1655 rb_erase(&io->rb_node, &write_tree);
dc267621 1656 kcryptd_io_write(io);
b3c5fd30 1657 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1658 blk_finish_plug(&plug);
1659 }
1660 return 0;
395b167c
AK		 1661}
1662
72c6e7af 1663static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1664{
dec1cedf 1665 struct bio *clone = io->ctx.bio_out;
49a8a920 1666 struct crypt_config *cc = io->cc;
dc267621 1667 unsigned long flags;
b3c5fd30
MP		 1668 sector_t sector;
1669 struct rb_node **rbp, *parent;
dec1cedf 1670
4e4cbee9 1671 if (unlikely(io->error)) {
dec1cedf
MB		 1672 crypt_free_buffer_pages(cc, clone);
1673 bio_put(clone);
6c031f41 1674 crypt_dec_pending(io);
dec1cedf
MB		 1675 return;
1676 }
1677
1678 /* crypt_convert should have filled the clone bio */
003b5c57 1679 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1680
4f024f37 1681 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1682
0f5d8e6e
MP		 1683 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1684 generic_make_request(clone);
1685 return;
1686 }
1687
dc267621 1688 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
b3c5fd30
MP		 1689 rbp = &cc->write_tree.rb_node;
1690 parent = NULL;
1691 sector = io->sector;
1692 while (*rbp) {
1693 parent = *rbp;
1694 if (sector < crypt_io_from_node(parent)->sector)
1695 rbp = &(*rbp)->rb_left;
1696 else
1697 rbp = &(*rbp)->rb_right;
1698 }
1699 rb_link_node(&io->rb_node, parent, rbp);
1700 rb_insert_color(&io->rb_node, &cc->write_tree);
1701
dc267621
MP		 1702 wake_up_locked(&cc->write_thread_wait);
1703 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
4e4eef64
MB		 1704}
1705
fc5a5e9a 1706static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1707{
49a8a920 1708 struct crypt_config *cc = io->cc;
8b004457 1709 struct bio *clone;
c8081618 1710 int crypt_finished;
b635b00e 1711 sector_t sector = io->sector;
4e4cbee9 1712 blk_status_t r;
8b004457 1713
fc5a5e9a
MB		 1714 /*
1715 * Prevent io from disappearing until this function completes.
1716 */
1717 crypt_inc_pending(io);
b635b00e 1718 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1719
cf2f1abf
MP		 1720 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1721 if (unlikely(!clone)) {
4e4cbee9 1722 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 1723 goto dec;
1724 }
c8081618 1725
cf2f1abf
MP		 1726 io->ctx.bio_out = clone;
1727 io->ctx.iter_out = clone->bi_iter;
b635b00e 1728
cf2f1abf 1729 sector += bio_sectors(clone);
93e605c2 1730
cf2f1abf
MP		 1731 crypt_inc_pending(io);
1732 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1733 if (r)
ef43aa38 1734 io->error = r;
cf2f1abf 1735 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1736
cf2f1abf
MP		 1737 /* Encryption was already finished, submit io now */
1738 if (crypt_finished) {
1739 kcryptd_crypt_write_io_submit(io, 0);
1740 io->sector = sector;
93e605c2 1741 }
899c95d3 1742
cf2f1abf 1743dec:
899c95d3 1744 crypt_dec_pending(io);
84131db6
MB		 1745}
1746
72c6e7af 1747static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1748{
5742fd77
MB		 1749 crypt_dec_pending(io);
1750}
1751
4e4eef64 1752static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1753{
49a8a920 1754 struct crypt_config *cc = io->cc;
4e4cbee9 1755 blk_status_t r;
1da177e4 1756
3e1a8bdd 1757 crypt_inc_pending(io);
3a7f6c99 1758
53017030 1759 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1760 io->sector);
1da177e4 1761
5742fd77 1762 r = crypt_convert(cc, &io->ctx);
4e4cbee9 1763 if (r)
ef43aa38 1764 io->error = r;
5742fd77 1765
40b6229b 1766 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1767 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1768
1769 crypt_dec_pending(io);
1da177e4
LT		 1770}
1771
95497a96
MB		 1772static void kcryptd_async_done(struct crypto_async_request *async_req,
1773 int error)
1774{
b2174eeb
HY		 1775 struct dm_crypt_request *dmreq = async_req->data;
1776 struct convert_context *ctx = dmreq->ctx;
95497a96 1777 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1778 struct crypt_config *cc = io->cc;
95497a96 1779
54cea3f6
MB		 1780 /*
1781 * A request from crypto driver backlog is going to be processed now,
1782 * finish the completion and continue in crypt_convert().
1783 * (Callback will be called for the second time for this request.)
1784 */
c0403ec0
RV		 1785 if (error == -EINPROGRESS) {
1786 complete(&ctx->restart);
95497a96 1787 return;
c0403ec0 1788 }
95497a96 1789
2dc5327d 1790 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 1791 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 1792
ef43aa38
MB		 1793 if (error == -EBADMSG) {
1794 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1795 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 1796 io->error = BLK_STS_PROTECTION;
ef43aa38 1797 } else if (error < 0)
4e4cbee9 1798 io->error = BLK_STS_IOERR;
72c6e7af 1799
298a9fa0 1800 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1801
40b6229b 1802 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1803 return;
95497a96
MB		 1804
1805 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1806 kcryptd_crypt_read_done(io);
95497a96 1807 else
72c6e7af 1808 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1809}
1810
395b167c 1811static void kcryptd_crypt(struct work_struct *work)
1da177e4 1812{
028867ac 1813 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1814
cabf08e4 1815 if (bio_data_dir(io->base_bio) == READ)
395b167c 1816 kcryptd_crypt_read_convert(io);
4e4eef64 1817 else
395b167c 1818 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1819}
1820
395b167c 1821static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1822{
49a8a920 1823 struct crypt_config *cc = io->cc;
cabf08e4 1824
395b167c
AK		 1825 INIT_WORK(&io->work, kcryptd_crypt);
1826 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1827}
1828
ef43aa38 1829static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 1830{
ef43aa38
MB		 1831 if (!cc->cipher_tfm.tfms_aead)
1832 return;
1da177e4 1833
ef43aa38
MB		 1834 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1835 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1836 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 1837 }
1838
ef43aa38
MB		 1839 kfree(cc->cipher_tfm.tfms_aead);
1840 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 1841}
1842
ef43aa38 1843static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1844{
d1f96423
MB		 1845 unsigned i;
1846
ef43aa38 1847 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1848 return;
1849
d1f96423 1850 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1851 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1852 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1853 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1854 }
fd2d231f 1855
ef43aa38
MB		 1856 kfree(cc->cipher_tfm.tfms);
1857 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1858}
1859
ef43aa38
MB		 1860static void crypt_free_tfms(struct crypt_config *cc)
1861{
33d2f09f 1862 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1863 crypt_free_tfms_aead(cc);
1864 else
1865 crypt_free_tfms_skcipher(cc);
1866}
1867
1868static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1869{
d1f96423
MB		 1870 unsigned i;
1871 int err;
1872
ef43aa38
MB		 1873 cc->cipher_tfm.tfms = kzalloc(cc->tfms_count *
1874 sizeof(struct crypto_skcipher *), GFP_KERNEL);
1875 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1876 return -ENOMEM;
1877
d1f96423 1878 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1879 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1880 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1881 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1882 crypt_free_tfms(cc);
d1f96423
MB		 1883 return err;
1884 }
1885 }
1886
1887 return 0;
1888}
1889
ef43aa38
MB		 1890static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1891{
ef43aa38
MB		 1892 int err;
1893
1894 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1895 if (!cc->cipher_tfm.tfms)
1896 return -ENOMEM;
1897
ef43aa38
MB		 1898 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1899 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1900 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1901 crypt_free_tfms(cc);
1902 return err;
1903 }
1904
ef43aa38
MB		 1905 return 0;
1906}
1907
1908static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1909{
33d2f09f 1910 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1911 return crypt_alloc_tfms_aead(cc, ciphermode);
1912 else
1913 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1914}
1915
1916static unsigned crypt_subkey_size(struct crypt_config *cc)
1917{
1918 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1919}
1920
1921static unsigned crypt_authenckey_size(struct crypt_config *cc)
1922{
1923 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1924}
1925
1926/*
1927 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1928 * the key must be for some reason in special format.
1929 * This funcion converts cc->key to this special format.
1930 */
1931static void crypt_copy_authenckey(char *p, const void *key,
1932 unsigned enckeylen, unsigned authkeylen)
1933{
1934 struct crypto_authenc_key_param *param;
1935 struct rtattr *rta;
1936
1937 rta = (struct rtattr *)p;
1938 param = RTA_DATA(rta);
1939 param->enckeylen = cpu_to_be32(enckeylen);
1940 rta->rta_len = RTA_LENGTH(sizeof(*param));
1941 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1942 p += RTA_SPACE(sizeof(*param));
1943 memcpy(p, key + enckeylen, authkeylen);
1944 p += authkeylen;
1945 memcpy(p, key, enckeylen);
1946}
1947
671ea6b4 1948static int crypt_setkey(struct crypt_config *cc)
c0297721 1949{
da31a078 1950 unsigned subkey_size;
fd2d231f
MP		 1951 int err = 0, i, r;
1952
da31a078 1953 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1954 subkey_size = crypt_subkey_size(cc);
da31a078 1955
27c70036
MB		 1956 if (crypt_integrity_hmac(cc)) {
1957 if (subkey_size < cc->key_mac_size)
1958 return -EINVAL;
1959
ef43aa38
MB		 1960 crypt_copy_authenckey(cc->authenc_key, cc->key,
1961 subkey_size - cc->key_mac_size,
1962 cc->key_mac_size);
27c70036
MB		 1963 }
1964
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
c538f6ec
OK		 2060 if (!ret) {
2061 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2062 kzfree(cc->key_string);
2063 cc->key_string = new_key_string;
2064 } else
2065 kzfree(new_key_string);
2066
2067 return ret;
2068}
2069
2070static int get_key_size(char **key_string)
2071{
2072 char *colon, dummy;
2073 int ret;
2074
2075 if (*key_string[0] != ':')
2076 return strlen(*key_string) >> 1;
2077
2078 /* look for next ':' in key string */
2079 colon = strpbrk(*key_string + 1, ":");
2080 if (!colon)
2081 return -EINVAL;
2082
2083 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2084 return -EINVAL;
2085
2086 *key_string = colon;
2087
2088 /* remaining key string should be :<logon|user>:<key_desc> */
2089
2090 return ret;
2091}
2092
2093#else
2094
2095static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2096{
2097 return -EINVAL;
2098}
2099
2100static int get_key_size(char **key_string)
2101{
2102 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2103}
2104
2105#endif
2106
e48d4bbf
MB		 2107static int crypt_set_key(struct crypt_config *cc, char *key)
2108{
de8be5ac
MB		 2109 int r = -EINVAL;
2110 int key_string_len = strlen(key);
2111
69a8cfcd
MB		 2112 /* Hyphen (which gives a key_size of zero) means there is no key. */
2113 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2114 goto out;
e48d4bbf 2115
c538f6ec
OK		 2116 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2117 if (key[0] == ':') {
2118 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2119 goto out;
c538f6ec 2120 }
e48d4bbf 2121
265e9098
OK		 2122 /* clear the flag since following operations may invalidate previously valid key */
2123 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2124
c538f6ec
OK		 2125 /* wipe references to any kernel keyring key */
2126 kzfree(cc->key_string);
2127 cc->key_string = NULL;
2128
e944e03e
AS		 2129 /* Decode key from its hex representation. */
2130 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2131 goto out;
e48d4bbf 2132
671ea6b4 2133 r = crypt_setkey(cc);
265e9098
OK		 2134 if (!r)
2135 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2136
2137out:
2138 /* Hex key string not needed after here, so wipe it. */
2139 memset(key, '0', key_string_len);
2140
2141 return r;
e48d4bbf
MB		 2142}
2143
2144static int crypt_wipe_key(struct crypt_config *cc)
2145{
c82feeec
OK		 2146 int r;
2147
e48d4bbf 2148 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2149 get_random_bytes(&cc->key, cc->key_size);
c538f6ec
OK		 2150 kzfree(cc->key_string);
2151 cc->key_string = NULL;
c82feeec
OK		 2152 r = crypt_setkey(cc);
2153 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2154
c82feeec 2155 return r;
e48d4bbf
MB		 2156}
2157
28513fcc
MB		 2158static void crypt_dtr(struct dm_target *ti)
2159{
2160 struct crypt_config *cc = ti->private;
2161
2162 ti->private = NULL;
2163
2164 if (!cc)
2165 return;
2166
f659b100 2167 if (cc->write_thread)
dc267621
MP		 2168 kthread_stop(cc->write_thread);
2169
28513fcc
MB		 2170 if (cc->io_queue)
2171 destroy_workqueue(cc->io_queue);
2172 if (cc->crypt_queue)
2173 destroy_workqueue(cc->crypt_queue);
2174
fd2d231f
MP		 2175 crypt_free_tfms(cc);
2176
28513fcc
MB		 2177 if (cc->bs)
2178 bioset_free(cc->bs);
2179
6f65985e
JL		 2180 mempool_destroy(cc->page_pool);
2181 mempool_destroy(cc->req_pool);
ef43aa38 2182 mempool_destroy(cc->tag_pool);
28513fcc
MB		 2183
2184 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2185 cc->iv_gen_ops->dtr(cc);
2186
28513fcc
MB		 2187 if (cc->dev)
2188 dm_put_device(ti, cc->dev);
2189
5ebaee6d 2190 kzfree(cc->cipher);
7dbcd137 2191 kzfree(cc->cipher_string);
c538f6ec 2192 kzfree(cc->key_string);
ef43aa38
MB		 2193 kzfree(cc->cipher_auth);
2194 kzfree(cc->authenc_key);
28513fcc 2195
d5ffebdd
MS		 2196 mutex_destroy(&cc->bio_alloc_lock);
2197
28513fcc
MB		 2198 /* Must zero key material before freeing */
2199 kzfree(cc);
2200}
2201
e889f97a
MB		 2202static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2203{
2204 struct crypt_config *cc = ti->private;
2205
33d2f09f 2206 if (crypt_integrity_aead(cc))
e889f97a
MB		 2207 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2208 else
2209 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2210
e889f97a
MB		 2211 if (cc->iv_size)
2212 /* at least a 64 bit sector number should fit in our buffer */
2213 cc->iv_size = max(cc->iv_size,
2214 (unsigned int)(sizeof(u64) / sizeof(u8)));
2215 else if (ivmode) {
2216 DMWARN("Selected cipher does not support IVs");
2217 ivmode = NULL;
2218 }
2219
2220 /* Choose ivmode, see comments at iv code. */
2221 if (ivmode == NULL)
2222 cc->iv_gen_ops = NULL;
2223 else if (strcmp(ivmode, "plain") == 0)
2224 cc->iv_gen_ops = &crypt_iv_plain_ops;
2225 else if (strcmp(ivmode, "plain64") == 0)
2226 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2227 else if (strcmp(ivmode, "plain64be") == 0)
2228 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2229 else if (strcmp(ivmode, "essiv") == 0)
2230 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2231 else if (strcmp(ivmode, "benbi") == 0)
2232 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2233 else if (strcmp(ivmode, "null") == 0)
2234 cc->iv_gen_ops = &crypt_iv_null_ops;
2235 else if (strcmp(ivmode, "lmk") == 0) {
2236 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2237 /*
2238 * Version 2 and 3 is recognised according
2239 * to length of provided multi-key string.
2240 * If present (version 3), last key is used as IV seed.
2241 * All keys (including IV seed) are always the same size.
2242 */
2243 if (cc->key_size % cc->key_parts) {
2244 cc->key_parts++;
2245 cc->key_extra_size = cc->key_size / cc->key_parts;
2246 }
2247 } else if (strcmp(ivmode, "tcw") == 0) {
2248 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2249 cc->key_parts += 2; /* IV + whitening */
2250 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2251 } else if (strcmp(ivmode, "random") == 0) {
2252 cc->iv_gen_ops = &crypt_iv_random_ops;
2253 /* Need storage space in integrity fields. */
2254 cc->integrity_iv_size = cc->iv_size;
2255 } else {
2256 ti->error = "Invalid IV mode";
2257 return -EINVAL;
2258 }
2259
2260 return 0;
2261}
2262
33d2f09f
MB		 2263/*
2264 * Workaround to parse cipher algorithm from crypto API spec.
2265 * The cc->cipher is currently used only in ESSIV.
2266 * This should be probably done by crypto-api calls (once available...)
2267 */
2268static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2269{
2270 const char *alg_name = NULL;
2271 char *start, *end;
2272
2273 if (crypt_integrity_aead(cc)) {
2274 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2275 if (!alg_name)
2276 return -EINVAL;
2277 if (crypt_integrity_hmac(cc)) {
2278 alg_name = strchr(alg_name, ',');
2279 if (!alg_name)
2280 return -EINVAL;
2281 }
2282 alg_name++;
2283 } else {
2284 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2285 if (!alg_name)
2286 return -EINVAL;
2287 }
2288
2289 start = strchr(alg_name, '(');
2290 end = strchr(alg_name, ')');
2291
2292 if (!start && !end) {
2293 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2294 return cc->cipher ? 0 : -ENOMEM;
2295 }
2296
2297 if (!start || !end || ++start >= end)
2298 return -EINVAL;
2299
2300 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2301 if (!cc->cipher)
2302 return -ENOMEM;
2303
2304 strncpy(cc->cipher, start, end - start);
2305
2306 return 0;
2307}
2308
2309/*
2310 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2311 * The HMAC is needed to calculate tag size (HMAC digest size).
2312 * This should be probably done by crypto-api calls (once available...)
2313 */
2314static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2315{
2316 char *start, *end, *mac_alg = NULL;
2317 struct crypto_ahash *mac;
2318
2319 if (!strstarts(cipher_api, "authenc("))
2320 return 0;
2321
2322 start = strchr(cipher_api, '(');
2323 end = strchr(cipher_api, ',');
2324 if (!start || !end || ++start > end)
2325 return -EINVAL;
2326
2327 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2328 if (!mac_alg)
2329 return -ENOMEM;
2330 strncpy(mac_alg, start, end - start);
2331
2332 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2333 kfree(mac_alg);
2334
2335 if (IS_ERR(mac))
2336 return PTR_ERR(mac);
2337
2338 cc->key_mac_size = crypto_ahash_digestsize(mac);
2339 crypto_free_ahash(mac);
2340
2341 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2342 if (!cc->authenc_key)
2343 return -ENOMEM;
2344
2345 return 0;
2346}
2347
2348static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2349 char **ivmode, char **ivopts)
2350{
2351 struct crypt_config *cc = ti->private;
2352 char *tmp, *cipher_api;
2353 int ret = -EINVAL;
2354
2355 cc->tfms_count = 1;
2356
2357 /*
2358 * New format (capi: prefix)
2359 * capi:cipher_api_spec-iv:ivopts
2360 */
2361 tmp = &cipher_in[strlen("capi:")];
2362 cipher_api = strsep(&tmp, "-");
2363 *ivmode = strsep(&tmp, ":");
2364 *ivopts = tmp;
2365
2366 if (*ivmode && !strcmp(*ivmode, "lmk"))
2367 cc->tfms_count = 64;
2368
2369 cc->key_parts = cc->tfms_count;
2370
2371 /* Allocate cipher */
2372 ret = crypt_alloc_tfms(cc, cipher_api);
2373 if (ret < 0) {
2374 ti->error = "Error allocating crypto tfm";
2375 return ret;
2376 }
2377
2378 /* Alloc AEAD, can be used only in new format. */
2379 if (crypt_integrity_aead(cc)) {
2380 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2381 if (ret < 0) {
2382 ti->error = "Invalid AEAD cipher spec";
2383 return -ENOMEM;
2384 }
2385 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2386 } else
2387 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2388
2389 ret = crypt_ctr_blkdev_cipher(cc);
2390 if (ret < 0) {
2391 ti->error = "Cannot allocate cipher string";
2392 return -ENOMEM;
2393 }
2394
2395 return 0;
2396}
2397
2398static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2399 char **ivmode, char **ivopts)
1da177e4 2400{
5ebaee6d 2401 struct crypt_config *cc = ti->private;
33d2f09f 2402 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2403 char *cipher_api = NULL;
fd2d231f 2404 int ret = -EINVAL;
31998ef1 2405 char dummy;
1da177e4 2406
33d2f09f 2407 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2408 ti->error = "Bad cipher specification";
1da177e4
LT		 2409 return -EINVAL;
2410 }
2411
5ebaee6d
MB		 2412 /*
2413 * Legacy dm-crypt cipher specification
d1f96423 2414 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2415 */
2416 tmp = cipher_in;
d1f96423
MB		 2417 keycount = strsep(&tmp, "-");
2418 cipher = strsep(&keycount, ":");
2419
2420 if (!keycount)
2421 cc->tfms_count = 1;
31998ef1 2422 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2423 !is_power_of_2(cc->tfms_count)) {
2424 ti->error = "Bad cipher key count specification";
2425 return -EINVAL;
2426 }
2427 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2428
2429 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2430 if (!cc->cipher)
2431 goto bad_mem;
2432
1da177e4 2433 chainmode = strsep(&tmp, "-");
33d2f09f
MB		 2434 *ivopts = strsep(&tmp, "-");
2435 *ivmode = strsep(&*ivopts, ":");
1da177e4
LT		 2436
2437 if (tmp)
5ebaee6d 2438 DMWARN("Ignoring unexpected additional cipher options");
1da177e4 2439
7dbcd137
MB		 2440 /*
2441 * For compatibility with the original dm-crypt mapping format, if
2442 * only the cipher name is supplied, use cbc-plain.
2443 */
33d2f09f 2444 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2445 chainmode = "cbc";
33d2f09f 2446 *ivmode = "plain";
1da177e4
LT		 2447 }
2448
33d2f09f 2449 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2450 ti->error = "IV mechanism required";
2451 return -EINVAL;
1da177e4
LT		 2452 }
2453
5ebaee6d
MB		 2454 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2455 if (!cipher_api)
2456 goto bad_mem;
2457
2458 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2459 "%s(%s)", chainmode, cipher);
2460 if (ret < 0) {
2461 kfree(cipher_api);
2462 goto bad_mem;
1da177e4
LT		 2463 }
2464
5ebaee6d 2465 /* Allocate cipher */
fd2d231f
MP		 2466 ret = crypt_alloc_tfms(cc, cipher_api);
2467 if (ret < 0) {
2468 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2469 kfree(cipher_api);
2470 return ret;
1da177e4 2471 }
bd86e320 2472 kfree(cipher_api);
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
dc94902b
OK		 2529 /* wipe the kernel key payload copy */
2530 if (cc->key_string)
2531 memset(cc->key, 0, cc->key_size * sizeof(u8));
2532
5ebaee6d 2533 return ret;
5ebaee6d 2534}
5ebaee6d 2535
ef43aa38
MB		 2536static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2537{
2538 struct crypt_config *cc = ti->private;
2539 struct dm_arg_set as;
5916a22b 2540 static const struct dm_arg _args[] = {
8f0009a2 2541 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2542 };
2543 unsigned int opt_params, val;
2544 const char *opt_string, *sval;
8f0009a2 2545 char dummy;
ef43aa38
MB		 2546 int ret;
2547
2548 /* Optional parameters */
2549 as.argc = argc;
2550 as.argv = argv;
2551
2552 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2553 if (ret)
2554 return ret;
2555
2556 while (opt_params--) {
2557 opt_string = dm_shift_arg(&as);
2558 if (!opt_string) {
2559 ti->error = "Not enough feature arguments";
2560 return -EINVAL;
2561 }
2562
2563 if (!strcasecmp(opt_string, "allow_discards"))
2564 ti->num_discard_bios = 1;
2565
2566 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2567 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2568
2569 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2570 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2571 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2572 if (val == 0 || val > MAX_TAG_SIZE) {
2573 ti->error = "Invalid integrity arguments";
2574 return -EINVAL;
2575 }
2576 cc->on_disk_tag_size = val;
2577 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2578 if (!strcasecmp(sval, "aead")) {
2579 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2580 } else if (strcasecmp(sval, "none")) {
2581 ti->error = "Unknown integrity profile";
2582 return -EINVAL;
2583 }
2584
2585 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2586 if (!cc->cipher_auth)
2587 return -ENOMEM;
ff3af92b 2588 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2589 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2590 cc->sector_size > 4096 ||
ff3af92b 2591 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2592 ti->error = "Invalid feature value for sector_size";
2593 return -EINVAL;
2594 }
783874b0
MB		 2595 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
2596 ti->error = "Device size is not multiple of sector_size feature";
2597 return -EINVAL;
2598 }
ff3af92b 2599 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2600 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2601 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2602 else {
ef43aa38
MB		 2603 ti->error = "Invalid feature arguments";
2604 return -EINVAL;
2605 }
2606 }
2607
2608 return 0;
5ebaee6d
MB		 2609}
2610
2611/*
2612 * Construct an encryption mapping:
c538f6ec 2613 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2614 */
2615static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2616{
2617 struct crypt_config *cc;
c538f6ec 2618 int key_size;
ef43aa38 2619 unsigned int align_mask;
5ebaee6d
MB		 2620 unsigned long long tmpll;
2621 int ret;
ef43aa38 2622 size_t iv_size_padding, additional_req_size;
31998ef1 2623 char dummy;
772ae5f5 2624
772ae5f5 2625 if (argc < 5) {
5ebaee6d
MB		 2626 ti->error = "Not enough arguments";
2627 return -EINVAL;
1da177e4
LT		 2628 }
2629
c538f6ec
OK		 2630 key_size = get_key_size(&argv[1]);
2631 if (key_size < 0) {
2632 ti->error = "Cannot parse key size";
2633 return -EINVAL;
2634 }
5ebaee6d
MB		 2635
2636 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2637 if (!cc) {
2638 ti->error = "Cannot allocate encryption context";
2639 return -ENOMEM;
2640 }
69a8cfcd 2641 cc->key_size = key_size;
8f0009a2 2642 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2643 cc->sector_shift = 0;
5ebaee6d
MB		 2644
2645 ti->private = cc;
ef43aa38
MB		 2646
2647 /* Optional parameters need to be read before cipher constructor */
2648 if (argc > 5) {
2649 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2650 if (ret)
2651 goto bad;
2652 }
2653
5ebaee6d
MB		 2654 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2655 if (ret < 0)
2656 goto bad;
2657
33d2f09f 2658 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2659 cc->dmreq_start = sizeof(struct aead_request);
2660 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2661 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2662 } else {
2663 cc->dmreq_start = sizeof(struct skcipher_request);
2664 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2665 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2666 }
d49ec52f
MP		 2667 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2668
ef43aa38 2669 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2670 /* Allocate the padding exactly */
2671 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2672 & align_mask;
d49ec52f
MP		 2673 } else {
2674 /*
2675 * If the cipher requires greater alignment than kmalloc
2676 * alignment, we don't know the exact position of the
2677 * initialization vector. We must assume worst case.
2678 */
ef43aa38 2679 iv_size_padding = align_mask;
d49ec52f 2680 }
ddd42edf 2681
94f5e024 2682 ret = -ENOMEM;
ef43aa38
MB		 2683
2684 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2685 additional_req_size = sizeof(struct dm_crypt_request) +
2686 iv_size_padding + cc->iv_size +
2687 cc->iv_size +
2688 sizeof(uint64_t) +
2689 sizeof(unsigned int);
2690
2691 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size);
ddd42edf
MB		 2692 if (!cc->req_pool) {
2693 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2694 goto bad;
ddd42edf 2695 }
ddd42edf 2696
30187e1d 2697 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2698 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2699 ARCH_KMALLOC_MINALIGN);
298a9fa0 2700
cf2f1abf 2701 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
1da177e4 2702 if (!cc->page_pool) {
72d94861 2703 ti->error = "Cannot allocate page mempool";
28513fcc 2704 goto bad;
1da177e4
LT		 2705 }
2706
80cd1757 2707 cc->bs = bioset_create(MIN_IOS, 0, BIOSET_NEED_BVECS);
6a24c718
MB		 2708 if (!cc->bs) {
2709 ti->error = "Cannot allocate crypt bioset";
28513fcc 2710 goto bad;
6a24c718
MB		 2711 }
2712
7145c241
MP		 2713 mutex_init(&cc->bio_alloc_lock);
2714
28513fcc 2715 ret = -EINVAL;
8f0009a2
MB		 2716 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2717 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2718 ti->error = "Invalid iv_offset sector";
28513fcc 2719 goto bad;
1da177e4 2720 }
4ee218cd 2721 cc->iv_offset = tmpll;
1da177e4 2722
e80d1c80
VG		 2723 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2724 if (ret) {
28513fcc
MB		 2725 ti->error = "Device lookup failed";
2726 goto bad;
2727 }
2728
e80d1c80 2729 ret = -EINVAL;
31998ef1 2730 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
72d94861 2731 ti->error = "Invalid device sector";
28513fcc 2732 goto bad;
1da177e4 2733 }
4ee218cd 2734 cc->start = tmpll;
1da177e4 2735
33d2f09f 2736 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2737 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2738 if (ret)
2739 goto bad;
2740
ef43aa38
MB		 2741 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2742 if (!cc->tag_pool_max_sectors)
2743 cc->tag_pool_max_sectors = 1;
f3396c58 2744
ef43aa38
MB		 2745 cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS,
2746 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
2747 if (!cc->tag_pool) {
2748 ti->error = "Cannot allocate integrity tags mempool";
3cc2e57c 2749 ret = -ENOMEM;
ef43aa38 2750 goto bad;
772ae5f5 2751 }
583fe747
MP		 2752
2753 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 2754 }
2755
28513fcc 2756 ret = -ENOMEM;
a1b89132 2757 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
cabf08e4
MB		 2758 if (!cc->io_queue) {
2759 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2760 goto bad;
cabf08e4
MB		 2761 }
2762
f3396c58 2763 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
a1b89132 2764 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
f3396c58 2765 else
a1b89132
TM		 2766 cc->crypt_queue = alloc_workqueue("kcryptd",
2767 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
f3396c58 2768 num_online_cpus());
cabf08e4 2769 if (!cc->crypt_queue) {
9934a8be 2770 ti->error = "Couldn't create kcryptd queue";
28513fcc 2771 goto bad;
9934a8be
MB		 2772 }
2773
dc267621 2774 init_waitqueue_head(&cc->write_thread_wait);
b3c5fd30 2775 cc->write_tree = RB_ROOT;
dc267621
MP		 2776
2777 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
2778 if (IS_ERR(cc->write_thread)) {
2779 ret = PTR_ERR(cc->write_thread);
2780 cc->write_thread = NULL;
2781 ti->error = "Couldn't spawn write thread";
2782 goto bad;
2783 }
2784 wake_up_process(cc->write_thread);
2785
55a62eef 2786 ti->num_flush_bios = 1;
983c7db3 2787
1da177e4
LT		 2788 return 0;
2789
28513fcc
MB		 2790bad:
2791 crypt_dtr(ti);
2792 return ret;
1da177e4
LT		 2793}
2794
7de3ee57 2795static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2796{
028867ac 2797 struct dm_crypt_io *io;
49a8a920 2798 struct crypt_config *cc = ti->private;
647c7db1 2799
772ae5f5 2800 /*
28a8f0d3
MC		 2801 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2802 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2803 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2804 */
1eff9d32 2805 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2806 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 2807 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 2808 if (bio_sectors(bio))
4f024f37
KO		 2809 bio->bi_iter.bi_sector = cc->start +
2810 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2811 return DM_MAPIO_REMAPPED;
2812 }
1da177e4 2813
4e870e94
MP		 2814 /*
2815 * Check if bio is too large, split as needed.
2816 */
2817 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2818 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2819 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2820
8f0009a2
MB		 2821 /*
2822 * Ensure that bio is a multiple of internal sector encryption size
2823 * and is aligned to this size as defined in IO hints.
2824 */
2825 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 2826 return DM_MAPIO_KILL;
8f0009a2
MB		 2827
2828 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 2829 return DM_MAPIO_KILL;
8f0009a2 2830
298a9fa0
MP		 2831 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2832 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2833
2834 if (cc->on_disk_tag_size) {
583fe747 2835 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 2836
2837 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 2838 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 2839 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2840 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2841 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
2842 io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO);
2843 io->integrity_metadata_from_pool = true;
2844 }
2845 }
2846
33d2f09f 2847 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2848 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2849 else
2850 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2851
20c82538
MB		 2852 if (bio_data_dir(io->base_bio) == READ) {
2853 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2854 kcryptd_queue_read(io);
20c82538 2855 } else
cabf08e4 2856 kcryptd_queue_crypt(io);
1da177e4 2857
d2a7ad29 2858 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2859}
2860
fd7c092e
MP		 2861static void crypt_status(struct dm_target *ti, status_type_t type,
2862 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2863{
5ebaee6d 2864 struct crypt_config *cc = ti->private;
fd7c092e 2865 unsigned i, sz = 0;
f3396c58 2866 int num_feature_args = 0;
1da177e4
LT		 2867
2868 switch (type) {
2869 case STATUSTYPE_INFO:
2870 result[0] = '\0';
2871 break;
2872
2873 case STATUSTYPE_TABLE:
7dbcd137 2874 DMEMIT("%s ", cc->cipher_string);
1da177e4 2875
c538f6ec
OK		 2876 if (cc->key_size > 0) {
2877 if (cc->key_string)
2878 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2879 else
2880 for (i = 0; i < cc->key_size; i++)
2881 DMEMIT("%02x", cc->key[i]);
2882 } else
fd7c092e 2883 DMEMIT("-");
1da177e4 2884
4ee218cd
AM		 2885 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2886 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2887
f3396c58
MP		 2888 num_feature_args += !!ti->num_discard_bios;
2889 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2890 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2891 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2892 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2893 if (cc->on_disk_tag_size)
2894 num_feature_args++;
f3396c58
MP		 2895 if (num_feature_args) {
2896 DMEMIT(" %d", num_feature_args);
2897 if (ti->num_discard_bios)
2898 DMEMIT(" allow_discards");
2899 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2900 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2901 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2902 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2903 if (cc->on_disk_tag_size)
2904 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2905 if (cc->sector_size != (1 << SECTOR_SHIFT))
2906 DMEMIT(" sector_size:%d", cc->sector_size);
2907 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2908 DMEMIT(" iv_large_sectors");
f3396c58 2909 }
772ae5f5 2910
1da177e4
LT		 2911 break;
2912 }
1da177e4
LT		 2913}
2914
e48d4bbf
MB		 2915static void crypt_postsuspend(struct dm_target *ti)
2916{
2917 struct crypt_config *cc = ti->private;
2918
2919 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2920}
2921
2922static int crypt_preresume(struct dm_target *ti)
2923{
2924 struct crypt_config *cc = ti->private;
2925
2926 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
2927 DMERR("aborting resume - crypt key is not set.");
2928 return -EAGAIN;
2929 }
2930
2931 return 0;
2932}
2933
2934static void crypt_resume(struct dm_target *ti)
2935{
2936 struct crypt_config *cc = ti->private;
2937
2938 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2939}
2940
2941/* Message interface
2942 * key set <key>
2943 * key wipe
2944 */
2945static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2946{
2947 struct crypt_config *cc = ti->private;
c538f6ec 2948 int key_size, ret = -EINVAL;
e48d4bbf
MB		 2949
2950 if (argc < 2)
2951 goto error;
2952
498f0103 2953 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 2954 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2955 DMWARN("not suspended during key manipulation.");
2956 return -EINVAL;
2957 }
498f0103 2958 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 2959 /* The key size may not be changed. */
2960 key_size = get_key_size(&argv[2]);
2961 if (key_size < 0 || cc->key_size != key_size) {
2962 memset(argv[2], '0', strlen(argv[2]));
2963 return -EINVAL;
2964 }
2965
542da317
MB		 2966 ret = crypt_set_key(cc, argv[2]);
2967 if (ret)
2968 return ret;
2969 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2970 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 2971 /* wipe the kernel key payload copy */
2972 if (cc->key_string)
2973 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 2974 return ret;
2975 }
498f0103 2976 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 2977 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2978 ret = cc->iv_gen_ops->wipe(cc);
2979 if (ret)
2980 return ret;
2981 }
e48d4bbf 2982 return crypt_wipe_key(cc);
542da317 2983 }
e48d4bbf
MB		 2984 }
2985
2986error:
2987 DMWARN("unrecognised message received.");
2988 return -EINVAL;
2989}
2990
af4874e0
MS		 2991static int crypt_iterate_devices(struct dm_target *ti,
2992 iterate_devices_callout_fn fn, void *data)
2993{
2994 struct crypt_config *cc = ti->private;
2995
5dea271b 2996 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 2997}
2998
586b286b
MS		 2999static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3000{
8f0009a2
MB		 3001 struct crypt_config *cc = ti->private;
3002
586b286b
MS		 3003 /*
3004 * Unfortunate constraint that is required to avoid the potential
3005 * for exceeding underlying device's max_segments limits -- due to
3006 * crypt_alloc_buffer() possibly allocating pages for the encryption
3007 * bio that are not as physically contiguous as the original bio.
3008 */
3009 limits->max_segment_size = PAGE_SIZE;
8f0009a2
MB		 3010
3011 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
3012 limits->logical_block_size = cc->sector_size;
3013 limits->physical_block_size = cc->sector_size;
3014 blk_limits_io_min(limits, cc->sector_size);
3015 }
586b286b
MS		 3016}
3017
1da177e4
LT		 3018static struct target_type crypt_target = {
3019 .name = "crypt",
dc94902b 3020 .version = {1, 18, 1},
1da177e4
LT		 3021 .module = THIS_MODULE,
3022 .ctr = crypt_ctr,
3023 .dtr = crypt_dtr,
3024 .map = crypt_map,
3025 .status = crypt_status,
e48d4bbf
MB		 3026 .postsuspend = crypt_postsuspend,
3027 .preresume = crypt_preresume,
3028 .resume = crypt_resume,
3029 .message = crypt_message,
af4874e0 3030 .iterate_devices = crypt_iterate_devices,
586b286b 3031 .io_hints = crypt_io_hints,
1da177e4
LT		 3032};
3033
3034static int __init dm_crypt_init(void)
3035{
3036 int r;
3037
1da177e4 3038 r = dm_register_target(&crypt_target);
94f5e024 3039 if (r < 0)
72d94861 3040 DMERR("register failed %d", r);
1da177e4 3041
1da177e4
LT		 3042 return r;
3043}
3044
3045static void __exit dm_crypt_exit(void)
3046{
10d3bd09 3047 dm_unregister_target(&crypt_target);
1da177e4
LT		 3048}
3049
3050module_init(dm_crypt_init);
3051module_exit(dm_crypt_exit);
3052
bf14299f 3053MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3054MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3055MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)