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dm mpath: requeue after a small delay if blk_get_request() fails
[mirror_ubuntu-hirsute-kernel.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
ef43aa38
MB		 4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 6 *
7 * This file is released under the GPL.
8 */
9
43d69034 10#include <linux/completion.h>
d1806f6a 11#include <linux/err.h>
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
c538f6ec 15#include <linux/key.h>
1da177e4
LT		 16#include <linux/bio.h>
17#include <linux/blkdev.h>
18#include <linux/mempool.h>
19#include <linux/slab.h>
20#include <linux/crypto.h>
21#include <linux/workqueue.h>
dc267621 22#include <linux/kthread.h>
3fcfab16 23#include <linux/backing-dev.h>
60063497 24#include <linux/atomic.h>
378f058c 25#include <linux/scatterlist.h>
b3c5fd30 26#include <linux/rbtree.h>
027c431c 27#include <linux/ctype.h>
1da177e4 28#include <asm/page.h>
48527fa7 29#include <asm/unaligned.h>
34745785
MB		 30#include <crypto/hash.h>
31#include <crypto/md5.h>
32#include <crypto/algapi.h>
bbdb23b5 33#include <crypto/skcipher.h>
ef43aa38
MB		 34#include <crypto/aead.h>
35#include <crypto/authenc.h>
36#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
c538f6ec 37#include <keys/user-type.h>
1da177e4 38
586e80e6 39#include <linux/device-mapper.h>
1da177e4 40
72d94861 41#define DM_MSG_PREFIX "crypt"
1da177e4 42
1da177e4
LT		 43/*
44 * context holding the current state of a multi-part conversion
45 */
46struct convert_context {
43d69034 47 struct completion restart;
1da177e4
LT		 48 struct bio *bio_in;
49 struct bio *bio_out;
003b5c57
KO		 50 struct bvec_iter iter_in;
51 struct bvec_iter iter_out;
c66029f4 52 sector_t cc_sector;
40b6229b 53 atomic_t cc_pending;
ef43aa38
MB		 54 union {
55 struct skcipher_request *req;
56 struct aead_request *req_aead;
57 } r;
58
1da177e4
LT		 59};
60
53017030
MB		 61/*
62 * per bio private data
63 */
64struct dm_crypt_io {
49a8a920 65 struct crypt_config *cc;
53017030 66 struct bio *base_bio;
ef43aa38
MB		 67 u8 *integrity_metadata;
68 bool integrity_metadata_from_pool;
53017030
MB		 69 struct work_struct work;
70
71 struct convert_context ctx;
72
40b6229b 73 atomic_t io_pending;
53017030 74 int error;
0c395b0f 75 sector_t sector;
dc267621 76
b3c5fd30 77 struct rb_node rb_node;
298a9fa0 78} CRYPTO_MINALIGN_ATTR;
53017030 79
01482b76 80struct dm_crypt_request {
b2174eeb 81 struct convert_context *ctx;
ef43aa38
MB		 82 struct scatterlist sg_in[4];
83 struct scatterlist sg_out[4];
2dc5327d 84 sector_t iv_sector;
01482b76
MB		 85};
86
1da177e4
LT		 87struct crypt_config;
88
89struct crypt_iv_operations {
90 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 91 const char *opts);
1da177e4 92 void (*dtr)(struct crypt_config *cc);
b95bf2d3 93 int (*init)(struct crypt_config *cc);
542da317 94 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 95 int (*generator)(struct crypt_config *cc, u8 *iv,
96 struct dm_crypt_request *dmreq);
97 int (*post)(struct crypt_config *cc, u8 *iv,
98 struct dm_crypt_request *dmreq);
1da177e4
LT		 99};
100
60473592 101struct iv_essiv_private {
bbdb23b5 102 struct crypto_ahash *hash_tfm;
b95bf2d3 103 u8 *salt;
60473592
MB		 104};
105
106struct iv_benbi_private {
107 int shift;
108};
109
34745785
MB		 110#define LMK_SEED_SIZE 64 /* hash + 0 */
111struct iv_lmk_private {
112 struct crypto_shash *hash_tfm;
113 u8 *seed;
114};
115
ed04d981
MB		 116#define TCW_WHITENING_SIZE 16
117struct iv_tcw_private {
118 struct crypto_shash *crc32_tfm;
119 u8 *iv_seed;
120 u8 *whitening;
121};
122
1da177e4
LT		 123/*
124 * Crypt: maps a linear range of a block device
125 * and encrypts / decrypts at the same time.
126 */
0f5d8e6e 127enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
f659b100 128 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
c0297721 129
ef43aa38
MB		 130enum cipher_flags {
131 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */
8f0009a2 132 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */
ef43aa38
MB		 133};
134
c0297721 135/*
610f2de3 136 * The fields in here must be read only after initialization.
c0297721 137 */
1da177e4
LT		 138struct crypt_config {
139 struct dm_dev *dev;
140 sector_t start;
141
142 /*
ef43aa38
MB		 143 * pool for per bio private data, crypto requests,
144 * encryption requeusts/buffer pages and integrity tags
1da177e4 145 */
ddd42edf 146 mempool_t *req_pool;
1da177e4 147 mempool_t *page_pool;
ef43aa38
MB		 148 mempool_t *tag_pool;
149 unsigned tag_pool_max_sectors;
150
6a24c718 151 struct bio_set *bs;
7145c241 152 struct mutex bio_alloc_lock;
1da177e4 153
cabf08e4
MB		 154 struct workqueue_struct *io_queue;
155 struct workqueue_struct *crypt_queue;
3f1e9070 156
dc267621
MP		 157 struct task_struct *write_thread;
158 wait_queue_head_t write_thread_wait;
b3c5fd30 159 struct rb_root write_tree;
dc267621 160
5ebaee6d 161 char *cipher;
7dbcd137 162 char *cipher_string;
ef43aa38 163 char *cipher_auth;
c538f6ec 164 char *key_string;
5ebaee6d 165
1b1b58f5 166 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 167 union {
60473592
MB		 168 struct iv_essiv_private essiv;
169 struct iv_benbi_private benbi;
34745785 170 struct iv_lmk_private lmk;
ed04d981 171 struct iv_tcw_private tcw;
79066ad3 172 } iv_gen_private;
1da177e4
LT		 173 sector_t iv_offset;
174 unsigned int iv_size;
ff3af92b
MP		 175 unsigned short int sector_size;
176 unsigned char sector_shift;
1da177e4 177
fd2d231f
MP		 178 /* ESSIV: struct crypto_cipher *essiv_tfm */
179 void *iv_private;
ef43aa38
MB		 180 union {
181 struct crypto_skcipher **tfms;
182 struct crypto_aead **tfms_aead;
183 } cipher_tfm;
d1f96423 184 unsigned tfms_count;
ef43aa38 185 unsigned long cipher_flags;
c0297721 186
ddd42edf
MB		 187 /*
188 * Layout of each crypto request:
189 *
bbdb23b5 190 * struct skcipher_request
ddd42edf
MB		 191 * context
192 * padding
193 * struct dm_crypt_request
194 * padding
195 * IV
196 *
197 * The padding is added so that dm_crypt_request and the IV are
198 * correctly aligned.
199 */
200 unsigned int dmreq_start;
ddd42edf 201
298a9fa0
MP		 202 unsigned int per_bio_data_size;
203
e48d4bbf 204 unsigned long flags;
1da177e4 205 unsigned int key_size;
da31a078
MB		 206 unsigned int key_parts; /* independent parts in key buffer */
207 unsigned int key_extra_size; /* additional keys length */
ef43aa38
MB		 208 unsigned int key_mac_size; /* MAC key size for authenc(...) */
209
210 unsigned int integrity_tag_size;
211 unsigned int integrity_iv_size;
212 unsigned int on_disk_tag_size;
213
214 u8 *authenc_key; /* space for keys in authenc() format (if used) */
1da177e4
LT		 215 u8 key[0];
216};
217
ef43aa38
MB		 218#define MIN_IOS 64
219#define MAX_TAG_SIZE 480
220#define POOL_ENTRY_SIZE 512
1da177e4 221
028867ac 222static void clone_init(struct dm_crypt_io *, struct bio *);
395b167c 223static void kcryptd_queue_crypt(struct dm_crypt_io *io);
ef43aa38
MB		 224static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
225 struct scatterlist *sg);
027581f3 226
c0297721
AK		 227/*
228 * Use this to access cipher attributes that are the same for each CPU.
229 */
bbdb23b5 230static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 231{
ef43aa38
MB		 232 return cc->cipher_tfm.tfms[0];
233}
234
235static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
236{
237 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 238}
239
1da177e4
LT		 240/*
241 * Different IV generation algorithms:
242 *
3c164bd8 243 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 244 * number, padded with zeros if necessary.
1da177e4 245 *
61afef61
MB		 246 * plain64: the initial vector is the 64-bit little-endian version of the sector
247 * number, padded with zeros if necessary.
248 *
3c164bd8
RS		 249 * essiv: "encrypted sector|salt initial vector", the sector number is
250 * encrypted with the bulk cipher using a salt as key. The salt
251 * should be derived from the bulk cipher's key via hashing.
1da177e4 252 *
48527fa7
RS		 253 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
254 * (needed for LRW-32-AES and possible other narrow block modes)
255 *
46b47730
LN		 256 * null: the initial vector is always zero. Provides compatibility with
257 * obsolete loop_fish2 devices. Do not use for new devices.
258 *
34745785
MB		 259 * lmk: Compatible implementation of the block chaining mode used
260 * by the Loop-AES block device encryption system
261 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
262 * It operates on full 512 byte sectors and uses CBC
263 * with an IV derived from the sector number, the data and
264 * optionally extra IV seed.
265 * This means that after decryption the first block
266 * of sector must be tweaked according to decrypted data.
267 * Loop-AES can use three encryption schemes:
268 * version 1: is plain aes-cbc mode
269 * version 2: uses 64 multikey scheme with lmk IV generator
270 * version 3: the same as version 2 with additional IV seed
271 * (it uses 65 keys, last key is used as IV seed)
272 *
ed04d981
MB		 273 * tcw: Compatible implementation of the block chaining mode used
274 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 275 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 276 * It operates on full 512 byte sectors and uses CBC
277 * with an IV derived from initial key and the sector number.
278 * In addition, whitening value is applied on every sector, whitening
279 * is calculated from initial key, sector number and mixed using CRC32.
280 * Note that this encryption scheme is vulnerable to watermarking attacks
281 * and should be used for old compatible containers access only.
282 *
1da177e4
LT		 283 * plumb: unimplemented, see:
284 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
285 */
286
2dc5327d
MB		 287static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
288 struct dm_crypt_request *dmreq)
1da177e4
LT		 289{
290 memset(iv, 0, cc->iv_size);
283a8328 291 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 292
293 return 0;
294}
295
61afef61 296static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 297 struct dm_crypt_request *dmreq)
61afef61
MB		 298{
299 memset(iv, 0, cc->iv_size);
283a8328 300 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 301
302 return 0;
303}
304
b95bf2d3
MB		 305/* Initialise ESSIV - compute salt but no local memory allocations */
306static int crypt_iv_essiv_init(struct crypt_config *cc)
307{
308 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 309 AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm);
b95bf2d3 310 struct scatterlist sg;
c0297721 311 struct crypto_cipher *essiv_tfm;
fd2d231f 312 int err;
b95bf2d3
MB		 313
314 sg_init_one(&sg, cc->key, cc->key_size);
bbdb23b5
HX		 315 ahash_request_set_tfm(req, essiv->hash_tfm);
316 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
317 ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size);
b95bf2d3 318
bbdb23b5
HX		 319 err = crypto_ahash_digest(req);
320 ahash_request_zero(req);
b95bf2d3
MB		 321 if (err)
322 return err;
323
fd2d231f 324 essiv_tfm = cc->iv_private;
c0297721 325
fd2d231f 326 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
bbdb23b5 327 crypto_ahash_digestsize(essiv->hash_tfm));
fd2d231f
MP		 328 if (err)
329 return err;
c0297721
AK		 330
331 return 0;
b95bf2d3
MB		 332}
333
542da317
MB		 334/* Wipe salt and reset key derived from volume key */
335static int crypt_iv_essiv_wipe(struct crypt_config *cc)
336{
337 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
bbdb23b5 338 unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm);
c0297721 339 struct crypto_cipher *essiv_tfm;
fd2d231f 340 int r, err = 0;
542da317
MB		 341
342 memset(essiv->salt, 0, salt_size);
343
fd2d231f
MP		 344 essiv_tfm = cc->iv_private;
345 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
346 if (r)
347 err = r;
c0297721
AK		 348
349 return err;
350}
351
352/* Set up per cpu cipher state */
353static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
354 struct dm_target *ti,
355 u8 *salt, unsigned saltsize)
356{
357 struct crypto_cipher *essiv_tfm;
358 int err;
359
360 /* Setup the essiv_tfm with the given salt */
361 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
362 if (IS_ERR(essiv_tfm)) {
363 ti->error = "Error allocating crypto tfm for ESSIV";
364 return essiv_tfm;
365 }
366
ef43aa38 367 if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) {
c0297721
AK		 368 ti->error = "Block size of ESSIV cipher does "
369 "not match IV size of block cipher";
370 crypto_free_cipher(essiv_tfm);
371 return ERR_PTR(-EINVAL);
372 }
373
374 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
375 if (err) {
376 ti->error = "Failed to set key for ESSIV cipher";
377 crypto_free_cipher(essiv_tfm);
378 return ERR_PTR(err);
379 }
380
381 return essiv_tfm;
542da317
MB		 382}
383
60473592
MB		 384static void crypt_iv_essiv_dtr(struct crypt_config *cc)
385{
c0297721 386 struct crypto_cipher *essiv_tfm;
60473592
MB		 387 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
388
bbdb23b5 389 crypto_free_ahash(essiv->hash_tfm);
b95bf2d3
MB		 390 essiv->hash_tfm = NULL;
391
392 kzfree(essiv->salt);
393 essiv->salt = NULL;
c0297721 394
fd2d231f 395 essiv_tfm = cc->iv_private;
c0297721 396
fd2d231f
MP		 397 if (essiv_tfm)
398 crypto_free_cipher(essiv_tfm);
c0297721 399
fd2d231f 400 cc->iv_private = NULL;
60473592
MB		 401}
402
1da177e4 403static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
d469f841 404 const char *opts)
1da177e4 405{
5861f1be 406 struct crypto_cipher *essiv_tfm = NULL;
bbdb23b5 407 struct crypto_ahash *hash_tfm = NULL;
5861f1be 408 u8 *salt = NULL;
fd2d231f 409 int err;
1da177e4 410
5861f1be 411 if (!opts) {
72d94861 412 ti->error = "Digest algorithm missing for ESSIV mode";
1da177e4
LT		 413 return -EINVAL;
414 }
415
b95bf2d3 416 /* Allocate hash algorithm */
bbdb23b5 417 hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC);
35058687 418 if (IS_ERR(hash_tfm)) {
72d94861 419 ti->error = "Error initializing ESSIV hash";
5861f1be
MB		 420 err = PTR_ERR(hash_tfm);
421 goto bad;
1da177e4
LT		 422 }
423
bbdb23b5 424 salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL);
5861f1be 425 if (!salt) {
72d94861 426 ti->error = "Error kmallocing salt storage in ESSIV";
5861f1be
MB		 427 err = -ENOMEM;
428 goto bad;
1da177e4
LT		 429 }
430
b95bf2d3 431 cc->iv_gen_private.essiv.salt = salt;
b95bf2d3
MB		 432 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
433
fd2d231f 434 essiv_tfm = setup_essiv_cpu(cc, ti, salt,
bbdb23b5 435 crypto_ahash_digestsize(hash_tfm));
ef43aa38 436
fd2d231f
MP		 437 if (IS_ERR(essiv_tfm)) {
438 crypt_iv_essiv_dtr(cc);
439 return PTR_ERR(essiv_tfm);
c0297721 440 }
fd2d231f 441 cc->iv_private = essiv_tfm;
c0297721 442
1da177e4 443 return 0;
5861f1be
MB		 444
445bad:
5861f1be 446 if (hash_tfm && !IS_ERR(hash_tfm))
bbdb23b5 447 crypto_free_ahash(hash_tfm);
b95bf2d3 448 kfree(salt);
5861f1be 449 return err;
1da177e4
LT		 450}
451
2dc5327d
MB		 452static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
453 struct dm_crypt_request *dmreq)
1da177e4 454{
fd2d231f 455 struct crypto_cipher *essiv_tfm = cc->iv_private;
c0297721 456
1da177e4 457 memset(iv, 0, cc->iv_size);
283a8328 458 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721
AK		 459 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
460
1da177e4
LT		 461 return 0;
462}
463
48527fa7
RS		 464static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
465 const char *opts)
466{
bbdb23b5 467 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
f0d1b0b3 468 int log = ilog2(bs);
48527fa7
RS		 469
470 /* we need to calculate how far we must shift the sector count
471 * to get the cipher block count, we use this shift in _gen */
472
473 if (1 << log != bs) {
474 ti->error = "cypher blocksize is not a power of 2";
475 return -EINVAL;
476 }
477
478 if (log > 9) {
479 ti->error = "cypher blocksize is > 512";
480 return -EINVAL;
481 }
482
60473592 483 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 484
485 return 0;
486}
487
488static void crypt_iv_benbi_dtr(struct crypt_config *cc)
489{
48527fa7
RS		 490}
491
2dc5327d
MB		 492static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
493 struct dm_crypt_request *dmreq)
48527fa7 494{
79066ad3
HX		 495 __be64 val;
496
48527fa7 497 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 498
2dc5327d 499 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 500 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 501
1da177e4
LT		 502 return 0;
503}
504
2dc5327d
MB		 505static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
506 struct dm_crypt_request *dmreq)
46b47730
LN		 507{
508 memset(iv, 0, cc->iv_size);
509
510 return 0;
511}
512
34745785
MB		 513static void crypt_iv_lmk_dtr(struct crypt_config *cc)
514{
515 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
516
517 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
518 crypto_free_shash(lmk->hash_tfm);
519 lmk->hash_tfm = NULL;
520
521 kzfree(lmk->seed);
522 lmk->seed = NULL;
523}
524
525static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
526 const char *opts)
527{
528 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
529
8f0009a2
MB		 530 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
531 ti->error = "Unsupported sector size for LMK";
532 return -EINVAL;
533 }
534
34745785
MB		 535 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
536 if (IS_ERR(lmk->hash_tfm)) {
537 ti->error = "Error initializing LMK hash";
538 return PTR_ERR(lmk->hash_tfm);
539 }
540
541 /* No seed in LMK version 2 */
542 if (cc->key_parts == cc->tfms_count) {
543 lmk->seed = NULL;
544 return 0;
545 }
546
547 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
548 if (!lmk->seed) {
549 crypt_iv_lmk_dtr(cc);
550 ti->error = "Error kmallocing seed storage in LMK";
551 return -ENOMEM;
552 }
553
554 return 0;
555}
556
557static int crypt_iv_lmk_init(struct crypt_config *cc)
558{
559 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
560 int subkey_size = cc->key_size / cc->key_parts;
561
562 /* LMK seed is on the position of LMK_KEYS + 1 key */
563 if (lmk->seed)
564 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
565 crypto_shash_digestsize(lmk->hash_tfm));
566
567 return 0;
568}
569
570static int crypt_iv_lmk_wipe(struct crypt_config *cc)
571{
572 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
573
574 if (lmk->seed)
575 memset(lmk->seed, 0, LMK_SEED_SIZE);
576
577 return 0;
578}
579
580static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
581 struct dm_crypt_request *dmreq,
582 u8 *data)
583{
584 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 585 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 586 struct md5_state md5state;
da31a078 587 __le32 buf[4];
34745785
MB		 588 int i, r;
589
b6106265
JSM		 590 desc->tfm = lmk->hash_tfm;
591 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
34745785 592
b6106265 593 r = crypto_shash_init(desc);
34745785
MB		 594 if (r)
595 return r;
596
597 if (lmk->seed) {
b6106265 598 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 599 if (r)
600 return r;
601 }
602
603 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 604 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 605 if (r)
606 return r;
607
608 /* Sector is cropped to 56 bits here */
609 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
610 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
611 buf[2] = cpu_to_le32(4024);
612 buf[3] = 0;
b6106265 613 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 614 if (r)
615 return r;
616
617 /* No MD5 padding here */
b6106265 618 r = crypto_shash_export(desc, &md5state);
34745785
MB		 619 if (r)
620 return r;
621
622 for (i = 0; i < MD5_HASH_WORDS; i++)
623 __cpu_to_le32s(&md5state.hash[i]);
624 memcpy(iv, &md5state.hash, cc->iv_size);
625
626 return 0;
627}
628
629static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
630 struct dm_crypt_request *dmreq)
631{
ef43aa38 632 struct scatterlist *sg;
34745785
MB		 633 u8 *src;
634 int r = 0;
635
636 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 637 sg = crypt_get_sg_data(cc, dmreq->sg_in);
638 src = kmap_atomic(sg_page(sg));
639 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 640 kunmap_atomic(src);
34745785
MB		 641 } else
642 memset(iv, 0, cc->iv_size);
643
644 return r;
645}
646
647static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
648 struct dm_crypt_request *dmreq)
649{
ef43aa38 650 struct scatterlist *sg;
34745785
MB		 651 u8 *dst;
652 int r;
653
654 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
655 return 0;
656
ef43aa38
MB		 657 sg = crypt_get_sg_data(cc, dmreq->sg_out);
658 dst = kmap_atomic(sg_page(sg));
659 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 660
661 /* Tweak the first block of plaintext sector */
662 if (!r)
ef43aa38 663 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 664
c2e022cb 665 kunmap_atomic(dst);
34745785
MB		 666 return r;
667}
668
ed04d981
MB		 669static void crypt_iv_tcw_dtr(struct crypt_config *cc)
670{
671 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
672
673 kzfree(tcw->iv_seed);
674 tcw->iv_seed = NULL;
675 kzfree(tcw->whitening);
676 tcw->whitening = NULL;
677
678 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
679 crypto_free_shash(tcw->crc32_tfm);
680 tcw->crc32_tfm = NULL;
681}
682
683static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
684 const char *opts)
685{
686 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
687
8f0009a2
MB		 688 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
689 ti->error = "Unsupported sector size for TCW";
690 return -EINVAL;
691 }
692
ed04d981
MB		 693 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
694 ti->error = "Wrong key size for TCW";
695 return -EINVAL;
696 }
697
698 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
699 if (IS_ERR(tcw->crc32_tfm)) {
700 ti->error = "Error initializing CRC32 in TCW";
701 return PTR_ERR(tcw->crc32_tfm);
702 }
703
704 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
705 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
706 if (!tcw->iv_seed || !tcw->whitening) {
707 crypt_iv_tcw_dtr(cc);
708 ti->error = "Error allocating seed storage in TCW";
709 return -ENOMEM;
710 }
711
712 return 0;
713}
714
715static int crypt_iv_tcw_init(struct crypt_config *cc)
716{
717 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
718 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
719
720 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
721 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
722 TCW_WHITENING_SIZE);
723
724 return 0;
725}
726
727static int crypt_iv_tcw_wipe(struct crypt_config *cc)
728{
729 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
730
731 memset(tcw->iv_seed, 0, cc->iv_size);
732 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
733
734 return 0;
735}
736
737static int crypt_iv_tcw_whitening(struct crypt_config *cc,
738 struct dm_crypt_request *dmreq,
739 u8 *data)
740{
741 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 742 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 743 u8 buf[TCW_WHITENING_SIZE];
b6106265 744 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 745 int i, r;
746
747 /* xor whitening with sector number */
748 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
749 crypto_xor(buf, (u8 *)&sector, 8);
750 crypto_xor(&buf[8], (u8 *)&sector, 8);
751
752 /* calculate crc32 for every 32bit part and xor it */
b6106265
JSM		 753 desc->tfm = tcw->crc32_tfm;
754 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ed04d981 755 for (i = 0; i < 4; i++) {
b6106265 756 r = crypto_shash_init(desc);
ed04d981
MB		 757 if (r)
758 goto out;
b6106265 759 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 760 if (r)
761 goto out;
b6106265 762 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 763 if (r)
764 goto out;
765 }
766 crypto_xor(&buf[0], &buf[12], 4);
767 crypto_xor(&buf[4], &buf[8], 4);
768
769 /* apply whitening (8 bytes) to whole sector */
770 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
771 crypto_xor(data + i * 8, buf, 8);
772out:
1a71d6ff 773 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 774 return r;
775}
776
777static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
778 struct dm_crypt_request *dmreq)
779{
ef43aa38 780 struct scatterlist *sg;
ed04d981 781 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 782 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 783 u8 *src;
784 int r = 0;
785
786 /* Remove whitening from ciphertext */
787 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 788 sg = crypt_get_sg_data(cc, dmreq->sg_in);
789 src = kmap_atomic(sg_page(sg));
790 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 791 kunmap_atomic(src);
792 }
793
794 /* Calculate IV */
795 memcpy(iv, tcw->iv_seed, cc->iv_size);
796 crypto_xor(iv, (u8 *)&sector, 8);
797 if (cc->iv_size > 8)
798 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
799
800 return r;
801}
802
803static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
804 struct dm_crypt_request *dmreq)
805{
ef43aa38 806 struct scatterlist *sg;
ed04d981
MB		 807 u8 *dst;
808 int r;
809
810 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
811 return 0;
812
813 /* Apply whitening on ciphertext */
ef43aa38
MB		 814 sg = crypt_get_sg_data(cc, dmreq->sg_out);
815 dst = kmap_atomic(sg_page(sg));
816 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 817 kunmap_atomic(dst);
818
819 return r;
820}
821
ef43aa38
MB		 822static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
823 struct dm_crypt_request *dmreq)
824{
825 /* Used only for writes, there must be an additional space to store IV */
826 get_random_bytes(iv, cc->iv_size);
827 return 0;
828}
829
1b1b58f5 830static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 831 .generator = crypt_iv_plain_gen
832};
833
1b1b58f5 834static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 835 .generator = crypt_iv_plain64_gen
836};
837
1b1b58f5 838static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 839 .ctr = crypt_iv_essiv_ctr,
840 .dtr = crypt_iv_essiv_dtr,
b95bf2d3 841 .init = crypt_iv_essiv_init,
542da317 842 .wipe = crypt_iv_essiv_wipe,
1da177e4
LT		 843 .generator = crypt_iv_essiv_gen
844};
845
1b1b58f5 846static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 847 .ctr = crypt_iv_benbi_ctr,
848 .dtr = crypt_iv_benbi_dtr,
849 .generator = crypt_iv_benbi_gen
850};
1da177e4 851
1b1b58f5 852static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 853 .generator = crypt_iv_null_gen
854};
855
1b1b58f5 856static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 857 .ctr = crypt_iv_lmk_ctr,
858 .dtr = crypt_iv_lmk_dtr,
859 .init = crypt_iv_lmk_init,
860 .wipe = crypt_iv_lmk_wipe,
861 .generator = crypt_iv_lmk_gen,
862 .post = crypt_iv_lmk_post
863};
864
1b1b58f5 865static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 866 .ctr = crypt_iv_tcw_ctr,
867 .dtr = crypt_iv_tcw_dtr,
868 .init = crypt_iv_tcw_init,
869 .wipe = crypt_iv_tcw_wipe,
870 .generator = crypt_iv_tcw_gen,
871 .post = crypt_iv_tcw_post
872};
873
ef43aa38
MB		 874static struct crypt_iv_operations crypt_iv_random_ops = {
875 .generator = crypt_iv_random_gen
876};
877
878/*
879 * Integrity extensions
880 */
881static bool crypt_integrity_aead(struct crypt_config *cc)
882{
883 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
884}
885
886static bool crypt_integrity_hmac(struct crypt_config *cc)
887{
33d2f09f 888 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 889}
890
891/* Get sg containing data */
892static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
893 struct scatterlist *sg)
894{
33d2f09f 895 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 896 return &sg[2];
897
898 return sg;
899}
900
901static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
902{
903 struct bio_integrity_payload *bip;
904 unsigned int tag_len;
905 int ret;
906
907 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
908 return 0;
909
910 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
911 if (IS_ERR(bip))
912 return PTR_ERR(bip);
913
914 tag_len = io->cc->on_disk_tag_size * bio_sectors(bio);
915
916 bip->bip_iter.bi_size = tag_len;
917 bip->bip_iter.bi_sector = io->cc->start + io->sector;
918
919 /* We own the metadata, do not let bio_free to release it */
920 bip->bip_flags &= ~BIP_BLOCK_INTEGRITY;
921
922 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
923 tag_len, offset_in_page(io->integrity_metadata));
924 if (unlikely(ret != tag_len))
925 return -ENOMEM;
926
927 return 0;
928}
929
930static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
931{
932#ifdef CONFIG_BLK_DEV_INTEGRITY
933 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
934
935 /* From now we require underlying device with our integrity profile */
936 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
937 ti->error = "Integrity profile not supported.";
938 return -EINVAL;
939 }
940
583fe747
MP		 941 if (bi->tag_size != cc->on_disk_tag_size ||
942 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 943 ti->error = "Integrity profile tag size mismatch.";
944 return -EINVAL;
945 }
583fe747
MP		 946 if (1 << bi->interval_exp != cc->sector_size) {
947 ti->error = "Integrity profile sector size mismatch.";
948 return -EINVAL;
949 }
ef43aa38 950
33d2f09f 951 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 952 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
953 DMINFO("Integrity AEAD, tag size %u, IV size %u.",
954 cc->integrity_tag_size, cc->integrity_iv_size);
955
956 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
957 ti->error = "Integrity AEAD auth tag size is not supported.";
958 return -EINVAL;
959 }
960 } else if (cc->integrity_iv_size)
961 DMINFO("Additional per-sector space %u bytes for IV.",
962 cc->integrity_iv_size);
963
964 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
965 ti->error = "Not enough space for integrity tag in the profile.";
966 return -EINVAL;
967 }
968
969 return 0;
970#else
971 ti->error = "Integrity profile not supported.";
972 return -EINVAL;
973#endif
974}
975
d469f841
MB		 976static void crypt_convert_init(struct crypt_config *cc,
977 struct convert_context *ctx,
978 struct bio *bio_out, struct bio *bio_in,
fcd369da 979 sector_t sector)
1da177e4
LT		 980{
981 ctx->bio_in = bio_in;
982 ctx->bio_out = bio_out;
003b5c57
KO		 983 if (bio_in)
984 ctx->iter_in = bio_in->bi_iter;
985 if (bio_out)
986 ctx->iter_out = bio_out->bi_iter;
c66029f4 987 ctx->cc_sector = sector + cc->iv_offset;
43d69034 988 init_completion(&ctx->restart);
1da177e4
LT		 989}
990
b2174eeb 991static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 992 void *req)
b2174eeb
HY		 993{
994 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
995}
996
ef43aa38 997static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 998{
ef43aa38 999 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1000}
1001
2dc5327d
MB		 1002static u8 *iv_of_dmreq(struct crypt_config *cc,
1003 struct dm_crypt_request *dmreq)
1004{
33d2f09f 1005 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1006 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1007 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1008 else
1009 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1010 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1011}
1012
ef43aa38
MB		 1013static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1014 struct dm_crypt_request *dmreq)
1015{
1016 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1017}
1018
1019static uint64_t *org_sector_of_dmreq(struct crypt_config *cc,
1020 struct dm_crypt_request *dmreq)
1021{
1022 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
1023 return (uint64_t*) ptr;
1024}
1025
1026static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1027 struct dm_crypt_request *dmreq)
1028{
1029 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1030 cc->iv_size + sizeof(uint64_t);
1031 return (unsigned int*)ptr;
1032}
1033
1034static void *tag_from_dmreq(struct crypt_config *cc,
1035 struct dm_crypt_request *dmreq)
1036{
1037 struct convert_context *ctx = dmreq->ctx;
1038 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1039
1040 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1041 cc->on_disk_tag_size];
1042}
1043
1044static void *iv_tag_from_dmreq(struct crypt_config *cc,
1045 struct dm_crypt_request *dmreq)
1046{
1047 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1048}
1049
1050static int crypt_convert_block_aead(struct crypt_config *cc,
1051 struct convert_context *ctx,
1052 struct aead_request *req,
1053 unsigned int tag_offset)
01482b76 1054{
003b5c57
KO		 1055 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1056 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1057 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1058 u8 *iv, *org_iv, *tag_iv, *tag;
1059 uint64_t *sector;
1060 int r = 0;
1061
1062 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1063
8f0009a2
MB		 1064 /* Reject unexpected unaligned bio. */
1065 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1066 return -EIO;
1067
b2174eeb 1068 dmreq = dmreq_of_req(cc, req);
ef43aa38 1069 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1070 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1071 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1072 dmreq->ctx = ctx;
1073
1074 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1075
1076 sector = org_sector_of_dmreq(cc, dmreq);
1077 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1078
2dc5327d 1079 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1080 org_iv = org_iv_of_dmreq(cc, dmreq);
1081 tag = tag_from_dmreq(cc, dmreq);
1082 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1083
1084 /* AEAD request:
1085 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1086 * | (authenticated) | (auth+encryption) | |
1087 * | sector_LE | IV | sector in/out | tag in/out |
1088 */
1089 sg_init_table(dmreq->sg_in, 4);
1090 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1091 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1092 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1093 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1094
1095 sg_init_table(dmreq->sg_out, 4);
1096 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1097 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1098 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1099 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1100
1101 if (cc->iv_gen_ops) {
1102 /* For READs use IV stored in integrity metadata */
1103 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1104 memcpy(org_iv, tag_iv, cc->iv_size);
1105 } else {
1106 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1107 if (r < 0)
1108 return r;
1109 /* Store generated IV in integrity metadata */
1110 if (cc->integrity_iv_size)
1111 memcpy(tag_iv, org_iv, cc->iv_size);
1112 }
1113 /* Working copy of IV, to be modified in crypto API */
1114 memcpy(iv, org_iv, cc->iv_size);
1115 }
1116
1117 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1118 if (bio_data_dir(ctx->bio_in) == WRITE) {
1119 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1120 cc->sector_size, iv);
ef43aa38
MB		 1121 r = crypto_aead_encrypt(req);
1122 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1123 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1124 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1125 } else {
1126 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1127 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1128 r = crypto_aead_decrypt(req);
1129 }
1130
1131 if (r == -EBADMSG)
1132 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1133 (unsigned long long)le64_to_cpu(*sector));
1134
1135 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1136 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1137
8f0009a2
MB		 1138 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1139 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1140
ef43aa38
MB		 1141 return r;
1142}
1143
1144static int crypt_convert_block_skcipher(struct crypt_config *cc,
1145 struct convert_context *ctx,
1146 struct skcipher_request *req,
1147 unsigned int tag_offset)
1148{
1149 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1150 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1151 struct scatterlist *sg_in, *sg_out;
1152 struct dm_crypt_request *dmreq;
ef43aa38
MB		 1153 u8 *iv, *org_iv, *tag_iv;
1154 uint64_t *sector;
1155 int r = 0;
1156
8f0009a2
MB		 1157 /* Reject unexpected unaligned bio. */
1158 if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
1159 return -EIO;
1160
ef43aa38 1161 dmreq = dmreq_of_req(cc, req);
c66029f4 1162 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1163 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1164 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1165 dmreq->ctx = ctx;
01482b76 1166
ef43aa38
MB		 1167 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1168
1169 iv = iv_of_dmreq(cc, dmreq);
1170 org_iv = org_iv_of_dmreq(cc, dmreq);
1171 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1172
1173 sector = org_sector_of_dmreq(cc, dmreq);
1174 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1175
1176 /* For skcipher we use only the first sg item */
1177 sg_in = &dmreq->sg_in[0];
1178 sg_out = &dmreq->sg_out[0];
01482b76 1179
ef43aa38 1180 sg_init_table(sg_in, 1);
8f0009a2 1181 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1182
1183 sg_init_table(sg_out, 1);
8f0009a2 1184 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1185
3a7f6c99 1186 if (cc->iv_gen_ops) {
ef43aa38
MB		 1187 /* For READs use IV stored in integrity metadata */
1188 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1189 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1190 } else {
1191 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1192 if (r < 0)
1193 return r;
1194 /* Store generated IV in integrity metadata */
1195 if (cc->integrity_iv_size)
1196 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1197 }
1198 /* Working copy of IV, to be modified in crypto API */
1199 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1200 }
1201
8f0009a2 1202 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1203
1204 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1205 r = crypto_skcipher_encrypt(req);
3a7f6c99 1206 else
bbdb23b5 1207 r = crypto_skcipher_decrypt(req);
3a7f6c99 1208
2dc5327d 1209 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1210 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1211
8f0009a2
MB		 1212 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1213 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1214
3a7f6c99 1215 return r;
01482b76
MB		 1216}
1217
95497a96
MB		 1218static void kcryptd_async_done(struct crypto_async_request *async_req,
1219 int error);
c0297721 1220
ef43aa38
MB		 1221static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1222 struct convert_context *ctx)
ddd42edf 1223{
c66029f4 1224 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1225
ef43aa38
MB		 1226 if (!ctx->r.req)
1227 ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO);
1228
1229 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
1230
1231 /*
1232 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1233 * requests if driver request queue is full.
1234 */
1235 skcipher_request_set_callback(ctx->r.req,
1236 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
1237 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
1238}
1239
1240static void crypt_alloc_req_aead(struct crypt_config *cc,
1241 struct convert_context *ctx)
1242{
1243 if (!ctx->r.req_aead)
1244 ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO);
c0297721 1245
ef43aa38 1246 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1247
1248 /*
1249 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1250 * requests if driver request queue is full.
1251 */
ef43aa38 1252 aead_request_set_callback(ctx->r.req_aead,
c0297721 1253 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ef43aa38
MB		 1254 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1255}
1256
1257static void crypt_alloc_req(struct crypt_config *cc,
1258 struct convert_context *ctx)
1259{
33d2f09f 1260 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1261 crypt_alloc_req_aead(cc, ctx);
1262 else
1263 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1264}
1265
ef43aa38
MB		 1266static void crypt_free_req_skcipher(struct crypt_config *cc,
1267 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1268{
1269 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1270
bbdb23b5 1271 if ((struct skcipher_request *)(io + 1) != req)
298a9fa0
MP		 1272 mempool_free(req, cc->req_pool);
1273}
1274
ef43aa38
MB		 1275static void crypt_free_req_aead(struct crypt_config *cc,
1276 struct aead_request *req, struct bio *base_bio)
1277{
1278 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1279
1280 if ((struct aead_request *)(io + 1) != req)
1281 mempool_free(req, cc->req_pool);
1282}
1283
1284static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1285{
33d2f09f 1286 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1287 crypt_free_req_aead(cc, req, base_bio);
1288 else
1289 crypt_free_req_skcipher(cc, req, base_bio);
1290}
1291
1da177e4
LT		 1292/*
1293 * Encrypt / decrypt data from one bio to another one (can be the same one)
1294 */
1295static int crypt_convert(struct crypt_config *cc,
d469f841 1296 struct convert_context *ctx)
1da177e4 1297{
ef43aa38 1298 unsigned int tag_offset = 0;
ff3af92b 1299 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1300 int r;
1da177e4 1301
40b6229b 1302 atomic_set(&ctx->cc_pending, 1);
c8081618 1303
003b5c57 1304 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1305
3a7f6c99 1306 crypt_alloc_req(cc, ctx);
40b6229b 1307 atomic_inc(&ctx->cc_pending);
3f1e9070 1308
33d2f09f 1309 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1310 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1311 else
1312 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1313
1314 switch (r) {
54cea3f6
MB		 1315 /*
1316 * The request was queued by a crypto driver
1317 * but the driver request queue is full, let's wait.
1318 */
3a7f6c99
MB		 1319 case -EBUSY:
1320 wait_for_completion(&ctx->restart);
16735d02 1321 reinit_completion(&ctx->restart);
54cea3f6
MB		 1322 /* fall through */
1323 /*
1324 * The request is queued and processed asynchronously,
1325 * completion function kcryptd_async_done() will be called.
1326 */
c0403ec0 1327 case -EINPROGRESS:
ef43aa38 1328 ctx->r.req = NULL;
8f0009a2 1329 ctx->cc_sector += sector_step;
583fe747 1330 tag_offset++;
3f1e9070 1331 continue;
54cea3f6
MB		 1332 /*
1333 * The request was already processed (synchronously).
1334 */
3a7f6c99 1335 case 0:
40b6229b 1336 atomic_dec(&ctx->cc_pending);
8f0009a2 1337 ctx->cc_sector += sector_step;
583fe747 1338 tag_offset++;
c7f1b204 1339 cond_resched();
3a7f6c99 1340 continue;
ef43aa38
MB		 1341 /*
1342 * There was a data integrity error.
1343 */
1344 case -EBADMSG:
1345 atomic_dec(&ctx->cc_pending);
1346 return -EILSEQ;
1347 /*
1348 * There was an error while processing the request.
1349 */
3f1e9070 1350 default:
40b6229b 1351 atomic_dec(&ctx->cc_pending);
ef43aa38 1352 return -EIO;
3f1e9070 1353 }
1da177e4
LT		 1354 }
1355
3f1e9070 1356 return 0;
1da177e4
LT		 1357}
1358
cf2f1abf
MP		 1359static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1360
1da177e4
LT		 1361/*
1362 * Generate a new unfragmented bio with the given size
586b286b
MS		 1363 * This should never violate the device limitations (but only because
1364 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1365 *
1366 * This function may be called concurrently. If we allocate from the mempool
1367 * concurrently, there is a possibility of deadlock. For example, if we have
1368 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1369 * the mempool concurrently, it may deadlock in a situation where both processes
1370 * have allocated 128 pages and the mempool is exhausted.
1371 *
1372 * In order to avoid this scenario we allocate the pages under a mutex.
1373 *
1374 * In order to not degrade performance with excessive locking, we try
1375 * non-blocking allocations without a mutex first but on failure we fallback
1376 * to blocking allocations with a mutex.
1da177e4 1377 */
cf2f1abf 1378static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1379{
49a8a920 1380 struct crypt_config *cc = io->cc;
8b004457 1381 struct bio *clone;
1da177e4 1382 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1383 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1384 unsigned i, len, remaining_size;
91e10625 1385 struct page *page;
1da177e4 1386
7145c241 1387retry:
d0164adc 1388 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1389 mutex_lock(&cc->bio_alloc_lock);
1390
2f9941b6 1391 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
8b004457 1392 if (!clone)
ef43aa38 1393 goto out;
1da177e4 1394
027581f3 1395 clone_init(io, clone);
6a24c718 1396
7145c241
MP		 1397 remaining_size = size;
1398
f97380bc 1399 for (i = 0; i < nr_iovecs; i++) {
91e10625 1400 page = mempool_alloc(cc->page_pool, gfp_mask);
7145c241
MP		 1401 if (!page) {
1402 crypt_free_buffer_pages(cc, clone);
1403 bio_put(clone);
d0164adc 1404 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1405 goto retry;
1406 }
1da177e4 1407
7145c241 1408 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1409
0dae7fe5 1410 bio_add_page(clone, page, len, 0);
1da177e4 1411
7145c241 1412 remaining_size -= len;
1da177e4
LT		 1413 }
1414
ef43aa38
MB		 1415 /* Allocate space for integrity tags */
1416 if (dm_crypt_integrity_io_alloc(io, clone)) {
1417 crypt_free_buffer_pages(cc, clone);
1418 bio_put(clone);
1419 clone = NULL;
1420 }
1421out:
d0164adc 1422 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1423 mutex_unlock(&cc->bio_alloc_lock);
1424
8b004457 1425 return clone;
1da177e4
LT		 1426}
1427
644bd2f0 1428static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1429{
644bd2f0 1430 unsigned int i;
1da177e4
LT		 1431 struct bio_vec *bv;
1432
cb34e057 1433 bio_for_each_segment_all(bv, clone, i) {
1da177e4
LT		 1434 BUG_ON(!bv->bv_page);
1435 mempool_free(bv->bv_page, cc->page_pool);
1436 bv->bv_page = NULL;
1437 }
1438}
1439
298a9fa0
MP		 1440static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1441 struct bio *bio, sector_t sector)
dc440d1e 1442{
49a8a920 1443 io->cc = cc;
dc440d1e
MB		 1444 io->base_bio = bio;
1445 io->sector = sector;
1446 io->error = 0;
ef43aa38
MB		 1447 io->ctx.r.req = NULL;
1448 io->integrity_metadata = NULL;
1449 io->integrity_metadata_from_pool = false;
40b6229b 1450 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1451}
1452
3e1a8bdd
MB		 1453static void crypt_inc_pending(struct dm_crypt_io *io)
1454{
40b6229b 1455 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1456}
1457
1da177e4
LT		 1458/*
1459 * One of the bios was finished. Check for completion of
1460 * the whole request and correctly clean up the buffer.
1461 */
5742fd77 1462static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1463{
49a8a920 1464 struct crypt_config *cc = io->cc;
b35f8caa 1465 struct bio *base_bio = io->base_bio;
b35f8caa 1466 int error = io->error;
1da177e4 1467
40b6229b 1468 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1469 return;
1470
ef43aa38
MB		 1471 if (io->ctx.r.req)
1472 crypt_free_req(cc, io->ctx.r.req, base_bio);
1473
1474 if (unlikely(io->integrity_metadata_from_pool))
1475 mempool_free(io->integrity_metadata, io->cc->tag_pool);
1476 else
1477 kfree(io->integrity_metadata);
b35f8caa 1478
4246a0b6
CH		 1479 base_bio->bi_error = error;
1480 bio_endio(base_bio);
1da177e4
LT		 1481}
1482
1483/*
cabf08e4 1484 * kcryptd/kcryptd_io:
1da177e4
LT		 1485 *
1486 * Needed because it would be very unwise to do decryption in an
23541d2d 1487 * interrupt context.
cabf08e4
MB		 1488 *
1489 * kcryptd performs the actual encryption or decryption.
1490 *
1491 * kcryptd_io performs the IO submission.
1492 *
1493 * They must be separated as otherwise the final stages could be
1494 * starved by new requests which can block in the first stages due
1495 * to memory allocation.
c0297721
AK		 1496 *
1497 * The work is done per CPU global for all dm-crypt instances.
1498 * They should not depend on each other and do not block.
1da177e4 1499 */
4246a0b6 1500static void crypt_endio(struct bio *clone)
8b004457 1501{
028867ac 1502 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1503 struct crypt_config *cc = io->cc;
ee7a491e 1504 unsigned rw = bio_data_dir(clone);
9b81c842 1505 int error;
8b004457
MB		 1506
1507 /*
6712ecf8 1508 * free the processed pages
8b004457 1509 */
ee7a491e 1510 if (rw == WRITE)
644bd2f0 1511 crypt_free_buffer_pages(cc, clone);
8b004457 1512
9b81c842 1513 error = clone->bi_error;
8b004457 1514 bio_put(clone);
8b004457 1515
9b81c842 1516 if (rw == READ && !error) {
ee7a491e
MB		 1517 kcryptd_queue_crypt(io);
1518 return;
1519 }
5742fd77 1520
9b81c842
SL		 1521 if (unlikely(error))
1522 io->error = error;
5742fd77
MB		 1523
1524 crypt_dec_pending(io);
8b004457
MB		 1525}
1526
028867ac 1527static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1528{
49a8a920 1529 struct crypt_config *cc = io->cc;
8b004457
MB		 1530
1531 clone->bi_private = io;
1532 clone->bi_end_io = crypt_endio;
1533 clone->bi_bdev = cc->dev->bdev;
ef295ecf 1534 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1535}
1536
20c82538 1537static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1538{
49a8a920 1539 struct crypt_config *cc = io->cc;
8b004457 1540 struct bio *clone;
93e605c2 1541
8b004457 1542 /*
59779079
MS		 1543 * We need the original biovec array in order to decrypt
1544 * the whole bio data *afterwards* -- thanks to immutable
1545 * biovecs we don't need to worry about the block layer
1546 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1547 */
59779079 1548 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
7eaceacc 1549 if (!clone)
20c82538 1550 return 1;
8b004457 1551
20c82538
MB		 1552 crypt_inc_pending(io);
1553
8b004457 1554 clone_init(io, clone);
4f024f37 1555 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1556
ef43aa38
MB		 1557 if (dm_crypt_integrity_io_alloc(io, clone)) {
1558 crypt_dec_pending(io);
1559 bio_put(clone);
1560 return 1;
1561 }
1562
93e605c2 1563 generic_make_request(clone);
20c82538 1564 return 0;
8b004457
MB		 1565}
1566
dc267621
MP		 1567static void kcryptd_io_read_work(struct work_struct *work)
1568{
1569 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1570
1571 crypt_inc_pending(io);
1572 if (kcryptd_io_read(io, GFP_NOIO))
1573 io->error = -ENOMEM;
1574 crypt_dec_pending(io);
1575}
1576
1577static void kcryptd_queue_read(struct dm_crypt_io *io)
1578{
1579 struct crypt_config *cc = io->cc;
1580
1581 INIT_WORK(&io->work, kcryptd_io_read_work);
1582 queue_work(cc->io_queue, &io->work);
1583}
1584
4e4eef64
MB		 1585static void kcryptd_io_write(struct dm_crypt_io *io)
1586{
95497a96 1587 struct bio *clone = io->ctx.bio_out;
dc267621 1588
95497a96 1589 generic_make_request(clone);
4e4eef64
MB		 1590}
1591
b3c5fd30
MP		 1592#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1593
dc267621 1594static int dmcrypt_write(void *data)
395b167c 1595{
dc267621 1596 struct crypt_config *cc = data;
b3c5fd30
MP		 1597 struct dm_crypt_io *io;
1598
dc267621 1599 while (1) {
b3c5fd30 1600 struct rb_root write_tree;
dc267621 1601 struct blk_plug plug;
395b167c 1602
dc267621 1603 DECLARE_WAITQUEUE(wait, current);
395b167c 1604
dc267621
MP		 1605 spin_lock_irq(&cc->write_thread_wait.lock);
1606continue_locked:
395b167c 1607
b3c5fd30 1608 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1609 goto pop_from_list;
1610
f659b100 1611 set_current_state(TASK_INTERRUPTIBLE);
dc267621
MP		 1612 __add_wait_queue(&cc->write_thread_wait, &wait);
1613
1614 spin_unlock_irq(&cc->write_thread_wait.lock);
1615
f659b100 1616 if (unlikely(kthread_should_stop())) {
642fa448 1617 set_current_state(TASK_RUNNING);
f659b100
RV		 1618 remove_wait_queue(&cc->write_thread_wait, &wait);
1619 break;
1620 }
1621
dc267621
MP		 1622 schedule();
1623
642fa448 1624 set_current_state(TASK_RUNNING);
dc267621
MP		 1625 spin_lock_irq(&cc->write_thread_wait.lock);
1626 __remove_wait_queue(&cc->write_thread_wait, &wait);
1627 goto continue_locked;
1628
1629pop_from_list:
b3c5fd30
MP		 1630 write_tree = cc->write_tree;
1631 cc->write_tree = RB_ROOT;
dc267621
MP		 1632 spin_unlock_irq(&cc->write_thread_wait.lock);
1633
b3c5fd30
MP		 1634 BUG_ON(rb_parent(write_tree.rb_node));
1635
1636 /*
1637 * Note: we cannot walk the tree here with rb_next because
1638 * the structures may be freed when kcryptd_io_write is called.
1639 */
dc267621
MP		 1640 blk_start_plug(&plug);
1641 do {
b3c5fd30
MP		 1642 io = crypt_io_from_node(rb_first(&write_tree));
1643 rb_erase(&io->rb_node, &write_tree);
dc267621 1644 kcryptd_io_write(io);
b3c5fd30 1645 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1646 blk_finish_plug(&plug);
1647 }
1648 return 0;
395b167c
AK		 1649}
1650
72c6e7af 1651static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1652{
dec1cedf 1653 struct bio *clone = io->ctx.bio_out;
49a8a920 1654 struct crypt_config *cc = io->cc;
dc267621 1655 unsigned long flags;
b3c5fd30
MP		 1656 sector_t sector;
1657 struct rb_node **rbp, *parent;
dec1cedf 1658
72c6e7af 1659 if (unlikely(io->error < 0)) {
dec1cedf
MB		 1660 crypt_free_buffer_pages(cc, clone);
1661 bio_put(clone);
6c031f41 1662 crypt_dec_pending(io);
dec1cedf
MB		 1663 return;
1664 }
1665
1666 /* crypt_convert should have filled the clone bio */
003b5c57 1667 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1668
4f024f37 1669 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1670
0f5d8e6e
MP		 1671 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1672 generic_make_request(clone);
1673 return;
1674 }
1675
dc267621 1676 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
b3c5fd30
MP		 1677 rbp = &cc->write_tree.rb_node;
1678 parent = NULL;
1679 sector = io->sector;
1680 while (*rbp) {
1681 parent = *rbp;
1682 if (sector < crypt_io_from_node(parent)->sector)
1683 rbp = &(*rbp)->rb_left;
1684 else
1685 rbp = &(*rbp)->rb_right;
1686 }
1687 rb_link_node(&io->rb_node, parent, rbp);
1688 rb_insert_color(&io->rb_node, &cc->write_tree);
1689
dc267621
MP		 1690 wake_up_locked(&cc->write_thread_wait);
1691 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
4e4eef64
MB		 1692}
1693
fc5a5e9a 1694static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1695{
49a8a920 1696 struct crypt_config *cc = io->cc;
8b004457 1697 struct bio *clone;
c8081618 1698 int crypt_finished;
b635b00e 1699 sector_t sector = io->sector;
dec1cedf 1700 int r;
8b004457 1701
fc5a5e9a
MB		 1702 /*
1703 * Prevent io from disappearing until this function completes.
1704 */
1705 crypt_inc_pending(io);
b635b00e 1706 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
fc5a5e9a 1707
cf2f1abf
MP		 1708 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1709 if (unlikely(!clone)) {
1710 io->error = -EIO;
1711 goto dec;
1712 }
c8081618 1713
cf2f1abf
MP		 1714 io->ctx.bio_out = clone;
1715 io->ctx.iter_out = clone->bi_iter;
b635b00e 1716
cf2f1abf 1717 sector += bio_sectors(clone);
93e605c2 1718
cf2f1abf
MP		 1719 crypt_inc_pending(io);
1720 r = crypt_convert(cc, &io->ctx);
ef43aa38
MB		 1721 if (r < 0)
1722 io->error = r;
cf2f1abf 1723 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
933f01d4 1724
cf2f1abf
MP		 1725 /* Encryption was already finished, submit io now */
1726 if (crypt_finished) {
1727 kcryptd_crypt_write_io_submit(io, 0);
1728 io->sector = sector;
93e605c2 1729 }
899c95d3 1730
cf2f1abf 1731dec:
899c95d3 1732 crypt_dec_pending(io);
84131db6
MB		 1733}
1734
72c6e7af 1735static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1736{
5742fd77
MB		 1737 crypt_dec_pending(io);
1738}
1739
4e4eef64 1740static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1741{
49a8a920 1742 struct crypt_config *cc = io->cc;
5742fd77 1743 int r = 0;
1da177e4 1744
3e1a8bdd 1745 crypt_inc_pending(io);
3a7f6c99 1746
53017030 1747 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 1748 io->sector);
1da177e4 1749
5742fd77 1750 r = crypt_convert(cc, &io->ctx);
72c6e7af 1751 if (r < 0)
ef43aa38 1752 io->error = r;
5742fd77 1753
40b6229b 1754 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 1755 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 1756
1757 crypt_dec_pending(io);
1da177e4
LT		 1758}
1759
95497a96
MB		 1760static void kcryptd_async_done(struct crypto_async_request *async_req,
1761 int error)
1762{
b2174eeb
HY		 1763 struct dm_crypt_request *dmreq = async_req->data;
1764 struct convert_context *ctx = dmreq->ctx;
95497a96 1765 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 1766 struct crypt_config *cc = io->cc;
95497a96 1767
54cea3f6
MB		 1768 /*
1769 * A request from crypto driver backlog is going to be processed now,
1770 * finish the completion and continue in crypt_convert().
1771 * (Callback will be called for the second time for this request.)
1772 */
c0403ec0
RV		 1773 if (error == -EINPROGRESS) {
1774 complete(&ctx->restart);
95497a96 1775 return;
c0403ec0 1776 }
95497a96 1777
2dc5327d 1778 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 1779 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 1780
ef43aa38
MB		 1781 if (error == -EBADMSG) {
1782 DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu",
1783 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
1784 io->error = -EILSEQ;
1785 } else if (error < 0)
72c6e7af
MP		 1786 io->error = -EIO;
1787
298a9fa0 1788 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 1789
40b6229b 1790 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 1791 return;
95497a96
MB		 1792
1793 if (bio_data_dir(io->base_bio) == READ)
72c6e7af 1794 kcryptd_crypt_read_done(io);
95497a96 1795 else
72c6e7af 1796 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 1797}
1798
395b167c 1799static void kcryptd_crypt(struct work_struct *work)
1da177e4 1800{
028867ac 1801 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 1802
cabf08e4 1803 if (bio_data_dir(io->base_bio) == READ)
395b167c 1804 kcryptd_crypt_read_convert(io);
4e4eef64 1805 else
395b167c 1806 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 1807}
1808
395b167c 1809static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 1810{
49a8a920 1811 struct crypt_config *cc = io->cc;
cabf08e4 1812
395b167c
AK		 1813 INIT_WORK(&io->work, kcryptd_crypt);
1814 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 1815}
1816
1817/*
1818 * Decode key from its hex representation
1819 */
1820static int crypt_decode_key(u8 *key, char *hex, unsigned int size)
1821{
1822 char buffer[3];
1da177e4
LT		 1823 unsigned int i;
1824
1825 buffer[2] = '\0';
1826
8b004457 1827 for (i = 0; i < size; i++) {
1da177e4
LT		 1828 buffer[0] = *hex++;
1829 buffer[1] = *hex++;
1830
1a66a08a 1831 if (kstrtou8(buffer, 16, &key[i]))
1da177e4
LT		 1832 return -EINVAL;
1833 }
1834
1835 if (*hex != '\0')
1836 return -EINVAL;
1837
1838 return 0;
1839}
1840
ef43aa38
MB		 1841static void crypt_free_tfms_aead(struct crypt_config *cc)
1842{
1843 if (!cc->cipher_tfm.tfms_aead)
1844 return;
1845
1846 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1847 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
1848 cc->cipher_tfm.tfms_aead[0] = NULL;
1849 }
1850
1851 kfree(cc->cipher_tfm.tfms_aead);
1852 cc->cipher_tfm.tfms_aead = NULL;
1853}
1854
1855static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 1856{
d1f96423
MB		 1857 unsigned i;
1858
ef43aa38 1859 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1860 return;
1861
d1f96423 1862 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 1863 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
1864 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
1865 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 1866 }
fd2d231f 1867
ef43aa38
MB		 1868 kfree(cc->cipher_tfm.tfms);
1869 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 1870}
1871
ef43aa38
MB		 1872static void crypt_free_tfms(struct crypt_config *cc)
1873{
33d2f09f 1874 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1875 crypt_free_tfms_aead(cc);
1876 else
1877 crypt_free_tfms_skcipher(cc);
1878}
1879
1880static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 1881{
d1f96423
MB		 1882 unsigned i;
1883 int err;
1884
ef43aa38
MB		 1885 cc->cipher_tfm.tfms = kzalloc(cc->tfms_count *
1886 sizeof(struct crypto_skcipher *), GFP_KERNEL);
1887 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 1888 return -ENOMEM;
1889
d1f96423 1890 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 1891 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
1892 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
1893 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 1894 crypt_free_tfms(cc);
d1f96423
MB		 1895 return err;
1896 }
1897 }
1898
1899 return 0;
1900}
1901
ef43aa38
MB		 1902static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
1903{
ef43aa38
MB		 1904 int err;
1905
1906 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
1907 if (!cc->cipher_tfm.tfms)
1908 return -ENOMEM;
1909
ef43aa38
MB		 1910 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
1911 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
1912 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
1913 crypt_free_tfms(cc);
1914 return err;
1915 }
1916
ef43aa38
MB		 1917 return 0;
1918}
1919
1920static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
1921{
33d2f09f 1922 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1923 return crypt_alloc_tfms_aead(cc, ciphermode);
1924 else
1925 return crypt_alloc_tfms_skcipher(cc, ciphermode);
1926}
1927
1928static unsigned crypt_subkey_size(struct crypt_config *cc)
1929{
1930 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1931}
1932
1933static unsigned crypt_authenckey_size(struct crypt_config *cc)
1934{
1935 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
1936}
1937
1938/*
1939 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
1940 * the key must be for some reason in special format.
1941 * This funcion converts cc->key to this special format.
1942 */
1943static void crypt_copy_authenckey(char *p, const void *key,
1944 unsigned enckeylen, unsigned authkeylen)
1945{
1946 struct crypto_authenc_key_param *param;
1947 struct rtattr *rta;
1948
1949 rta = (struct rtattr *)p;
1950 param = RTA_DATA(rta);
1951 param->enckeylen = cpu_to_be32(enckeylen);
1952 rta->rta_len = RTA_LENGTH(sizeof(*param));
1953 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1954 p += RTA_SPACE(sizeof(*param));
1955 memcpy(p, key + enckeylen, authkeylen);
1956 p += authkeylen;
1957 memcpy(p, key, enckeylen);
1958}
1959
671ea6b4 1960static int crypt_setkey(struct crypt_config *cc)
c0297721 1961{
da31a078 1962 unsigned subkey_size;
fd2d231f
MP		 1963 int err = 0, i, r;
1964
da31a078 1965 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 1966 subkey_size = crypt_subkey_size(cc);
da31a078 1967
ef43aa38
MB		 1968 if (crypt_integrity_hmac(cc))
1969 crypt_copy_authenckey(cc->authenc_key, cc->key,
1970 subkey_size - cc->key_mac_size,
1971 cc->key_mac_size);
fd2d231f 1972 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 1973 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 1974 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1975 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 1976 else if (crypt_integrity_aead(cc))
1977 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
1978 cc->key + (i * subkey_size),
1979 subkey_size);
ef43aa38
MB		 1980 else
1981 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
1982 cc->key + (i * subkey_size),
1983 subkey_size);
fd2d231f
MP		 1984 if (r)
1985 err = r;
c0297721
AK		 1986 }
1987
ef43aa38
MB		 1988 if (crypt_integrity_hmac(cc))
1989 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
1990
c0297721
AK		 1991 return err;
1992}
1993
c538f6ec
OK		 1994#ifdef CONFIG_KEYS
1995
027c431c
OK		 1996static bool contains_whitespace(const char *str)
1997{
1998 while (*str)
1999 if (isspace(*str++))
2000 return true;
2001 return false;
2002}
2003
c538f6ec
OK		 2004static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2005{
2006 char *new_key_string, *key_desc;
2007 int ret;
2008 struct key *key;
2009 const struct user_key_payload *ukp;
2010
027c431c
OK		 2011 /*
2012 * Reject key_string with whitespace. dm core currently lacks code for
2013 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2014 */
2015 if (contains_whitespace(key_string)) {
2016 DMERR("whitespace chars not allowed in key string");
2017 return -EINVAL;
2018 }
2019
c538f6ec
OK		 2020 /* look for next ':' separating key_type from key_description */
2021 key_desc = strpbrk(key_string, ":");
2022 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2023 return -EINVAL;
2024
2025 if (strncmp(key_string, "logon:", key_desc - key_string + 1) &&
2026 strncmp(key_string, "user:", key_desc - key_string + 1))
2027 return -EINVAL;
2028
2029 new_key_string = kstrdup(key_string, GFP_KERNEL);
2030 if (!new_key_string)
2031 return -ENOMEM;
2032
2033 key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
2034 key_desc + 1, NULL);
2035 if (IS_ERR(key)) {
2036 kzfree(new_key_string);
2037 return PTR_ERR(key);
2038 }
2039
f5b0cba8 2040 down_read(&key->sem);
c538f6ec 2041
0837e49a 2042 ukp = user_key_payload_locked(key);
c538f6ec 2043 if (!ukp) {
f5b0cba8 2044 up_read(&key->sem);
c538f6ec
OK		 2045 key_put(key);
2046 kzfree(new_key_string);
2047 return -EKEYREVOKED;
2048 }
2049
2050 if (cc->key_size != ukp->datalen) {
f5b0cba8 2051 up_read(&key->sem);
c538f6ec
OK		 2052 key_put(key);
2053 kzfree(new_key_string);
2054 return -EINVAL;
2055 }
2056
2057 memcpy(cc->key, ukp->data, cc->key_size);
2058
f5b0cba8 2059 up_read(&key->sem);
c538f6ec
OK		 2060 key_put(key);
2061
2062 /* clear the flag since following operations may invalidate previously valid key */
2063 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2064
2065 ret = crypt_setkey(cc);
2066
2067 /* wipe the kernel key payload copy in each case */
2068 memset(cc->key, 0, cc->key_size * sizeof(u8));
2069
2070 if (!ret) {
2071 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2072 kzfree(cc->key_string);
2073 cc->key_string = new_key_string;
2074 } else
2075 kzfree(new_key_string);
2076
2077 return ret;
2078}
2079
2080static int get_key_size(char **key_string)
2081{
2082 char *colon, dummy;
2083 int ret;
2084
2085 if (*key_string[0] != ':')
2086 return strlen(*key_string) >> 1;
2087
2088 /* look for next ':' in key string */
2089 colon = strpbrk(*key_string + 1, ":");
2090 if (!colon)
2091 return -EINVAL;
2092
2093 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2094 return -EINVAL;
2095
2096 *key_string = colon;
2097
2098 /* remaining key string should be :<logon|user>:<key_desc> */
2099
2100 return ret;
2101}
2102
2103#else
2104
2105static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2106{
2107 return -EINVAL;
2108}
2109
2110static int get_key_size(char **key_string)
2111{
2112 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2113}
2114
2115#endif
2116
e48d4bbf
MB		 2117static int crypt_set_key(struct crypt_config *cc, char *key)
2118{
de8be5ac
MB		 2119 int r = -EINVAL;
2120 int key_string_len = strlen(key);
2121
69a8cfcd
MB		 2122 /* Hyphen (which gives a key_size of zero) means there is no key. */
2123 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2124 goto out;
e48d4bbf 2125
c538f6ec
OK		 2126 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2127 if (key[0] == ':') {
2128 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2129 goto out;
c538f6ec 2130 }
e48d4bbf 2131
265e9098
OK		 2132 /* clear the flag since following operations may invalidate previously valid key */
2133 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2134
c538f6ec
OK		 2135 /* wipe references to any kernel keyring key */
2136 kzfree(cc->key_string);
2137 cc->key_string = NULL;
2138
69a8cfcd 2139 if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
de8be5ac 2140 goto out;
e48d4bbf 2141
671ea6b4 2142 r = crypt_setkey(cc);
265e9098
OK		 2143 if (!r)
2144 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2145
2146out:
2147 /* Hex key string not needed after here, so wipe it. */
2148 memset(key, '0', key_string_len);
2149
2150 return r;
e48d4bbf
MB		 2151}
2152
2153static int crypt_wipe_key(struct crypt_config *cc)
2154{
2155 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2156 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c538f6ec
OK		 2157 kzfree(cc->key_string);
2158 cc->key_string = NULL;
c0297721 2159
671ea6b4 2160 return crypt_setkey(cc);
e48d4bbf
MB		 2161}
2162
28513fcc
MB		 2163static void crypt_dtr(struct dm_target *ti)
2164{
2165 struct crypt_config *cc = ti->private;
2166
2167 ti->private = NULL;
2168
2169 if (!cc)
2170 return;
2171
f659b100 2172 if (cc->write_thread)
dc267621
MP		 2173 kthread_stop(cc->write_thread);
2174
28513fcc
MB		 2175 if (cc->io_queue)
2176 destroy_workqueue(cc->io_queue);
2177 if (cc->crypt_queue)
2178 destroy_workqueue(cc->crypt_queue);
2179
fd2d231f
MP		 2180 crypt_free_tfms(cc);
2181
28513fcc
MB		 2182 if (cc->bs)
2183 bioset_free(cc->bs);
2184
6f65985e
JL		 2185 mempool_destroy(cc->page_pool);
2186 mempool_destroy(cc->req_pool);
ef43aa38 2187 mempool_destroy(cc->tag_pool);
28513fcc
MB		 2188
2189 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2190 cc->iv_gen_ops->dtr(cc);
2191
28513fcc
MB		 2192 if (cc->dev)
2193 dm_put_device(ti, cc->dev);
2194
5ebaee6d 2195 kzfree(cc->cipher);
7dbcd137 2196 kzfree(cc->cipher_string);
c538f6ec 2197 kzfree(cc->key_string);
ef43aa38
MB		 2198 kzfree(cc->cipher_auth);
2199 kzfree(cc->authenc_key);
28513fcc
MB		 2200
2201 /* Must zero key material before freeing */
2202 kzfree(cc);
2203}
2204
e889f97a
MB		 2205static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2206{
2207 struct crypt_config *cc = ti->private;
2208
33d2f09f 2209 if (crypt_integrity_aead(cc))
e889f97a
MB		 2210 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2211 else
2212 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2213
e889f97a
MB		 2214 if (cc->iv_size)
2215 /* at least a 64 bit sector number should fit in our buffer */
2216 cc->iv_size = max(cc->iv_size,
2217 (unsigned int)(sizeof(u64) / sizeof(u8)));
2218 else if (ivmode) {
2219 DMWARN("Selected cipher does not support IVs");
2220 ivmode = NULL;
2221 }
2222
2223 /* Choose ivmode, see comments at iv code. */
2224 if (ivmode == NULL)
2225 cc->iv_gen_ops = NULL;
2226 else if (strcmp(ivmode, "plain") == 0)
2227 cc->iv_gen_ops = &crypt_iv_plain_ops;
2228 else if (strcmp(ivmode, "plain64") == 0)
2229 cc->iv_gen_ops = &crypt_iv_plain64_ops;
2230 else if (strcmp(ivmode, "essiv") == 0)
2231 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2232 else if (strcmp(ivmode, "benbi") == 0)
2233 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2234 else if (strcmp(ivmode, "null") == 0)
2235 cc->iv_gen_ops = &crypt_iv_null_ops;
2236 else if (strcmp(ivmode, "lmk") == 0) {
2237 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2238 /*
2239 * Version 2 and 3 is recognised according
2240 * to length of provided multi-key string.
2241 * If present (version 3), last key is used as IV seed.
2242 * All keys (including IV seed) are always the same size.
2243 */
2244 if (cc->key_size % cc->key_parts) {
2245 cc->key_parts++;
2246 cc->key_extra_size = cc->key_size / cc->key_parts;
2247 }
2248 } else if (strcmp(ivmode, "tcw") == 0) {
2249 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2250 cc->key_parts += 2; /* IV + whitening */
2251 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2252 } else if (strcmp(ivmode, "random") == 0) {
2253 cc->iv_gen_ops = &crypt_iv_random_ops;
2254 /* Need storage space in integrity fields. */
2255 cc->integrity_iv_size = cc->iv_size;
2256 } else {
2257 ti->error = "Invalid IV mode";
2258 return -EINVAL;
2259 }
2260
2261 return 0;
2262}
2263
33d2f09f
MB		 2264/*
2265 * Workaround to parse cipher algorithm from crypto API spec.
2266 * The cc->cipher is currently used only in ESSIV.
2267 * This should be probably done by crypto-api calls (once available...)
2268 */
2269static int crypt_ctr_blkdev_cipher(struct crypt_config *cc)
2270{
2271 const char *alg_name = NULL;
2272 char *start, *end;
2273
2274 if (crypt_integrity_aead(cc)) {
2275 alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc)));
2276 if (!alg_name)
2277 return -EINVAL;
2278 if (crypt_integrity_hmac(cc)) {
2279 alg_name = strchr(alg_name, ',');
2280 if (!alg_name)
2281 return -EINVAL;
2282 }
2283 alg_name++;
2284 } else {
2285 alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc)));
2286 if (!alg_name)
2287 return -EINVAL;
2288 }
2289
2290 start = strchr(alg_name, '(');
2291 end = strchr(alg_name, ')');
2292
2293 if (!start && !end) {
2294 cc->cipher = kstrdup(alg_name, GFP_KERNEL);
2295 return cc->cipher ? 0 : -ENOMEM;
2296 }
2297
2298 if (!start || !end || ++start >= end)
2299 return -EINVAL;
2300
2301 cc->cipher = kzalloc(end - start + 1, GFP_KERNEL);
2302 if (!cc->cipher)
2303 return -ENOMEM;
2304
2305 strncpy(cc->cipher, start, end - start);
2306
2307 return 0;
2308}
2309
2310/*
2311 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2312 * The HMAC is needed to calculate tag size (HMAC digest size).
2313 * This should be probably done by crypto-api calls (once available...)
2314 */
2315static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2316{
2317 char *start, *end, *mac_alg = NULL;
2318 struct crypto_ahash *mac;
2319
2320 if (!strstarts(cipher_api, "authenc("))
2321 return 0;
2322
2323 start = strchr(cipher_api, '(');
2324 end = strchr(cipher_api, ',');
2325 if (!start || !end || ++start > end)
2326 return -EINVAL;
2327
2328 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2329 if (!mac_alg)
2330 return -ENOMEM;
2331 strncpy(mac_alg, start, end - start);
2332
2333 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2334 kfree(mac_alg);
2335
2336 if (IS_ERR(mac))
2337 return PTR_ERR(mac);
2338
2339 cc->key_mac_size = crypto_ahash_digestsize(mac);
2340 crypto_free_ahash(mac);
2341
2342 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2343 if (!cc->authenc_key)
2344 return -ENOMEM;
2345
2346 return 0;
2347}
2348
2349static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2350 char **ivmode, char **ivopts)
2351{
2352 struct crypt_config *cc = ti->private;
2353 char *tmp, *cipher_api;
2354 int ret = -EINVAL;
2355
2356 cc->tfms_count = 1;
2357
2358 /*
2359 * New format (capi: prefix)
2360 * capi:cipher_api_spec-iv:ivopts
2361 */
2362 tmp = &cipher_in[strlen("capi:")];
2363 cipher_api = strsep(&tmp, "-");
2364 *ivmode = strsep(&tmp, ":");
2365 *ivopts = tmp;
2366
2367 if (*ivmode && !strcmp(*ivmode, "lmk"))
2368 cc->tfms_count = 64;
2369
2370 cc->key_parts = cc->tfms_count;
2371
2372 /* Allocate cipher */
2373 ret = crypt_alloc_tfms(cc, cipher_api);
2374 if (ret < 0) {
2375 ti->error = "Error allocating crypto tfm";
2376 return ret;
2377 }
2378
2379 /* Alloc AEAD, can be used only in new format. */
2380 if (crypt_integrity_aead(cc)) {
2381 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2382 if (ret < 0) {
2383 ti->error = "Invalid AEAD cipher spec";
2384 return -ENOMEM;
2385 }
2386 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2387 } else
2388 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2389
2390 ret = crypt_ctr_blkdev_cipher(cc);
2391 if (ret < 0) {
2392 ti->error = "Cannot allocate cipher string";
2393 return -ENOMEM;
2394 }
2395
2396 return 0;
2397}
2398
2399static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2400 char **ivmode, char **ivopts)
1da177e4 2401{
5ebaee6d 2402 struct crypt_config *cc = ti->private;
33d2f09f 2403 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2404 char *cipher_api = NULL;
fd2d231f 2405 int ret = -EINVAL;
31998ef1 2406 char dummy;
1da177e4 2407
33d2f09f 2408 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2409 ti->error = "Bad cipher specification";
1da177e4
LT		 2410 return -EINVAL;
2411 }
2412
5ebaee6d
MB		 2413 /*
2414 * Legacy dm-crypt cipher specification
d1f96423 2415 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2416 */
2417 tmp = cipher_in;
d1f96423
MB		 2418 keycount = strsep(&tmp, "-");
2419 cipher = strsep(&keycount, ":");
2420
2421 if (!keycount)
2422 cc->tfms_count = 1;
31998ef1 2423 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2424 !is_power_of_2(cc->tfms_count)) {
2425 ti->error = "Bad cipher key count specification";
2426 return -EINVAL;
2427 }
2428 cc->key_parts = cc->tfms_count;
5ebaee6d
MB		 2429
2430 cc->cipher = kstrdup(cipher, GFP_KERNEL);
2431 if (!cc->cipher)
2432 goto bad_mem;
2433
1da177e4 2434 chainmode = strsep(&tmp, "-");
33d2f09f
MB		 2435 *ivopts = strsep(&tmp, "-");
2436 *ivmode = strsep(&*ivopts, ":");
1da177e4
LT		 2437
2438 if (tmp)
5ebaee6d 2439 DMWARN("Ignoring unexpected additional cipher options");
1da177e4 2440
7dbcd137
MB		 2441 /*
2442 * For compatibility with the original dm-crypt mapping format, if
2443 * only the cipher name is supplied, use cbc-plain.
2444 */
33d2f09f 2445 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2446 chainmode = "cbc";
33d2f09f 2447 *ivmode = "plain";
1da177e4
LT		 2448 }
2449
33d2f09f 2450 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2451 ti->error = "IV mechanism required";
2452 return -EINVAL;
1da177e4
LT		 2453 }
2454
5ebaee6d
MB		 2455 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2456 if (!cipher_api)
2457 goto bad_mem;
2458
2459 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2460 "%s(%s)", chainmode, cipher);
2461 if (ret < 0) {
2462 kfree(cipher_api);
2463 goto bad_mem;
1da177e4
LT		 2464 }
2465
5ebaee6d 2466 /* Allocate cipher */
fd2d231f
MP		 2467 ret = crypt_alloc_tfms(cc, cipher_api);
2468 if (ret < 0) {
2469 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2470 kfree(cipher_api);
2471 return ret;
2472 }
2473
2474 return 0;
2475bad_mem:
2476 ti->error = "Cannot allocate cipher strings";
2477 return -ENOMEM;
2478}
2479
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 2490 }
1da177e4 2491
33d2f09f
MB		 2492 if (strstarts(cipher_in, "capi:"))
2493 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2494 else
2495 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2496 if (ret)
2497 return ret;
2498
5ebaee6d 2499 /* Initialize IV */
e889f97a
MB		 2500 ret = crypt_ctr_ivmode(ti, ivmode);
2501 if (ret < 0)
33d2f09f 2502 return ret;
1da177e4 2503
da31a078
MB		 2504 /* Initialize and set key */
2505 ret = crypt_set_key(cc, key);
2506 if (ret < 0) {
2507 ti->error = "Error decoding and setting key";
33d2f09f 2508 return ret;
da31a078
MB		 2509 }
2510
28513fcc
MB		 2511 /* Allocate IV */
2512 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2513 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2514 if (ret < 0) {
2515 ti->error = "Error creating IV";
33d2f09f 2516 return ret;
28513fcc
MB		 2517 }
2518 }
1da177e4 2519
28513fcc
MB		 2520 /* Initialize IV (set keys for ESSIV etc) */
2521 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2522 ret = cc->iv_gen_ops->init(cc);
2523 if (ret < 0) {
2524 ti->error = "Error initialising IV";
33d2f09f 2525 return ret;
28513fcc 2526 }
b95bf2d3
MB		 2527 }
2528
5ebaee6d 2529 return ret;
5ebaee6d
MB		 2530}
2531
ef43aa38
MB		 2532static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2533{
2534 struct crypt_config *cc = ti->private;
2535 struct dm_arg_set as;
2536 static struct dm_arg _args[] = {
8f0009a2 2537 {0, 6, "Invalid number of feature args"},
ef43aa38
MB		 2538 };
2539 unsigned int opt_params, val;
2540 const char *opt_string, *sval;
8f0009a2 2541 char dummy;
ef43aa38
MB		 2542 int ret;
2543
2544 /* Optional parameters */
2545 as.argc = argc;
2546 as.argv = argv;
2547
2548 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2549 if (ret)
2550 return ret;
2551
2552 while (opt_params--) {
2553 opt_string = dm_shift_arg(&as);
2554 if (!opt_string) {
2555 ti->error = "Not enough feature arguments";
2556 return -EINVAL;
2557 }
2558
2559 if (!strcasecmp(opt_string, "allow_discards"))
2560 ti->num_discard_bios = 1;
2561
2562 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2563 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2564
2565 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2566 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
2567 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2568 if (val == 0 || val > MAX_TAG_SIZE) {
2569 ti->error = "Invalid integrity arguments";
2570 return -EINVAL;
2571 }
2572 cc->on_disk_tag_size = val;
2573 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2574 if (!strcasecmp(sval, "aead")) {
2575 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2576 } else if (strcasecmp(sval, "none")) {
2577 ti->error = "Unknown integrity profile";
2578 return -EINVAL;
2579 }
2580
2581 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2582 if (!cc->cipher_auth)
2583 return -ENOMEM;
ff3af92b 2584 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2585 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2586 cc->sector_size > 4096 ||
ff3af92b 2587 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2588 ti->error = "Invalid feature value for sector_size";
2589 return -EINVAL;
2590 }
ff3af92b 2591 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2592 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2593 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2594 else {
ef43aa38
MB		 2595 ti->error = "Invalid feature arguments";
2596 return -EINVAL;
2597 }
2598 }
2599
2600 return 0;
2601}
2602
5ebaee6d
MB		 2603/*
2604 * Construct an encryption mapping:
c538f6ec 2605 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2606 */
2607static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2608{
2609 struct crypt_config *cc;
c538f6ec 2610 int key_size;
ef43aa38 2611 unsigned int align_mask;
5ebaee6d
MB		 2612 unsigned long long tmpll;
2613 int ret;
ef43aa38 2614 size_t iv_size_padding, additional_req_size;
31998ef1 2615 char dummy;
772ae5f5 2616
772ae5f5 2617 if (argc < 5) {
5ebaee6d
MB		 2618 ti->error = "Not enough arguments";
2619 return -EINVAL;
1da177e4
LT		 2620 }
2621
c538f6ec
OK		 2622 key_size = get_key_size(&argv[1]);
2623 if (key_size < 0) {
2624 ti->error = "Cannot parse key size";
2625 return -EINVAL;
2626 }
5ebaee6d
MB		 2627
2628 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
2629 if (!cc) {
2630 ti->error = "Cannot allocate encryption context";
2631 return -ENOMEM;
2632 }
69a8cfcd 2633 cc->key_size = key_size;
8f0009a2 2634 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 2635 cc->sector_shift = 0;
5ebaee6d
MB		 2636
2637 ti->private = cc;
ef43aa38
MB		 2638
2639 /* Optional parameters need to be read before cipher constructor */
2640 if (argc > 5) {
2641 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
2642 if (ret)
2643 goto bad;
2644 }
2645
5ebaee6d
MB		 2646 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
2647 if (ret < 0)
2648 goto bad;
2649
33d2f09f 2650 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 2651 cc->dmreq_start = sizeof(struct aead_request);
2652 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
2653 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
2654 } else {
2655 cc->dmreq_start = sizeof(struct skcipher_request);
2656 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
2657 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
2658 }
d49ec52f
MP		 2659 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
2660
ef43aa38 2661 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 2662 /* Allocate the padding exactly */
2663 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 2664 & align_mask;
d49ec52f
MP		 2665 } else {
2666 /*
2667 * If the cipher requires greater alignment than kmalloc
2668 * alignment, we don't know the exact position of the
2669 * initialization vector. We must assume worst case.
2670 */
ef43aa38 2671 iv_size_padding = align_mask;
d49ec52f 2672 }
ddd42edf 2673
94f5e024 2674 ret = -ENOMEM;
ef43aa38
MB		 2675
2676 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
2677 additional_req_size = sizeof(struct dm_crypt_request) +
2678 iv_size_padding + cc->iv_size +
2679 cc->iv_size +
2680 sizeof(uint64_t) +
2681 sizeof(unsigned int);
2682
2683 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size);
ddd42edf
MB		 2684 if (!cc->req_pool) {
2685 ti->error = "Cannot allocate crypt request mempool";
28513fcc 2686 goto bad;
ddd42edf 2687 }
ddd42edf 2688
30187e1d 2689 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 2690 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 2691 ARCH_KMALLOC_MINALIGN);
298a9fa0 2692
cf2f1abf 2693 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
1da177e4 2694 if (!cc->page_pool) {
72d94861 2695 ti->error = "Cannot allocate page mempool";
28513fcc 2696 goto bad;
1da177e4
LT		 2697 }
2698
bb799ca0 2699 cc->bs = bioset_create(MIN_IOS, 0);
6a24c718
MB		 2700 if (!cc->bs) {
2701 ti->error = "Cannot allocate crypt bioset";
28513fcc 2702 goto bad;
6a24c718
MB		 2703 }
2704
7145c241
MP		 2705 mutex_init(&cc->bio_alloc_lock);
2706
28513fcc 2707 ret = -EINVAL;
8f0009a2
MB		 2708 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
2709 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 2710 ti->error = "Invalid iv_offset sector";
28513fcc 2711 goto bad;
1da177e4 2712 }
4ee218cd 2713 cc->iv_offset = tmpll;
1da177e4 2714
e80d1c80
VG		 2715 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
2716 if (ret) {
28513fcc
MB		 2717 ti->error = "Device lookup failed";
2718 goto bad;
2719 }
2720
e80d1c80 2721 ret = -EINVAL;
31998ef1 2722 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
72d94861 2723 ti->error = "Invalid device sector";
28513fcc 2724 goto bad;
1da177e4 2725 }
4ee218cd 2726 cc->start = tmpll;
1da177e4 2727
33d2f09f 2728 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 2729 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 2730 if (ret)
2731 goto bad;
2732
ef43aa38
MB		 2733 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
2734 if (!cc->tag_pool_max_sectors)
2735 cc->tag_pool_max_sectors = 1;
f3396c58 2736
ef43aa38
MB		 2737 cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS,
2738 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
2739 if (!cc->tag_pool) {
2740 ti->error = "Cannot allocate integrity tags mempool";
2741 goto bad;
772ae5f5 2742 }
583fe747
MP		 2743
2744 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 2745 }
2746
28513fcc 2747 ret = -ENOMEM;
670368a8 2748 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
cabf08e4
MB		 2749 if (!cc->io_queue) {
2750 ti->error = "Couldn't create kcryptd io queue";
28513fcc 2751 goto bad;
cabf08e4
MB		 2752 }
2753
f3396c58
MP		 2754 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2755 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
2756 else
2757 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
2758 num_online_cpus());
cabf08e4 2759 if (!cc->crypt_queue) {
9934a8be 2760 ti->error = "Couldn't create kcryptd queue";
28513fcc 2761 goto bad;
9934a8be
MB		 2762 }
2763
dc267621 2764 init_waitqueue_head(&cc->write_thread_wait);
b3c5fd30 2765 cc->write_tree = RB_ROOT;
dc267621
MP		 2766
2767 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
2768 if (IS_ERR(cc->write_thread)) {
2769 ret = PTR_ERR(cc->write_thread);
2770 cc->write_thread = NULL;
2771 ti->error = "Couldn't spawn write thread";
2772 goto bad;
2773 }
2774 wake_up_process(cc->write_thread);
2775
55a62eef 2776 ti->num_flush_bios = 1;
0ac55489 2777 ti->discard_zeroes_data_unsupported = true;
983c7db3 2778
1da177e4
LT		 2779 return 0;
2780
28513fcc
MB		 2781bad:
2782 crypt_dtr(ti);
2783 return ret;
1da177e4
LT		 2784}
2785
7de3ee57 2786static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 2787{
028867ac 2788 struct dm_crypt_io *io;
49a8a920 2789 struct crypt_config *cc = ti->private;
647c7db1 2790
772ae5f5 2791 /*
28a8f0d3
MC		 2792 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
2793 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 2794 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 2795 */
1eff9d32 2796 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 2797 bio_op(bio) == REQ_OP_DISCARD)) {
647c7db1 2798 bio->bi_bdev = cc->dev->bdev;
772ae5f5 2799 if (bio_sectors(bio))
4f024f37
KO		 2800 bio->bi_iter.bi_sector = cc->start +
2801 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 2802 return DM_MAPIO_REMAPPED;
2803 }
1da177e4 2804
4e870e94
MP		 2805 /*
2806 * Check if bio is too large, split as needed.
2807 */
2808 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 2809 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 2810 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
2811
8f0009a2
MB		 2812 /*
2813 * Ensure that bio is a multiple of internal sector encryption size
2814 * and is aligned to this size as defined in IO hints.
2815 */
2816 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
2817 return -EIO;
2818
2819 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
2820 return -EIO;
2821
298a9fa0
MP		 2822 io = dm_per_bio_data(bio, cc->per_bio_data_size);
2823 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 2824
2825 if (cc->on_disk_tag_size) {
583fe747 2826 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 2827
2828 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 2829 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 2830 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
2831 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
2832 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
2833 io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO);
2834 io->integrity_metadata_from_pool = true;
2835 }
2836 }
2837
33d2f09f 2838 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2839 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
2840 else
2841 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 2842
20c82538
MB		 2843 if (bio_data_dir(io->base_bio) == READ) {
2844 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 2845 kcryptd_queue_read(io);
20c82538 2846 } else
cabf08e4 2847 kcryptd_queue_crypt(io);
1da177e4 2848
d2a7ad29 2849 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 2850}
2851
fd7c092e
MP		 2852static void crypt_status(struct dm_target *ti, status_type_t type,
2853 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 2854{
5ebaee6d 2855 struct crypt_config *cc = ti->private;
fd7c092e 2856 unsigned i, sz = 0;
f3396c58 2857 int num_feature_args = 0;
1da177e4
LT		 2858
2859 switch (type) {
2860 case STATUSTYPE_INFO:
2861 result[0] = '\0';
2862 break;
2863
2864 case STATUSTYPE_TABLE:
7dbcd137 2865 DMEMIT("%s ", cc->cipher_string);
1da177e4 2866
c538f6ec
OK		 2867 if (cc->key_size > 0) {
2868 if (cc->key_string)
2869 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
2870 else
2871 for (i = 0; i < cc->key_size; i++)
2872 DMEMIT("%02x", cc->key[i]);
2873 } else
fd7c092e 2874 DMEMIT("-");
1da177e4 2875
4ee218cd
AM		 2876 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
2877 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 2878
f3396c58
MP		 2879 num_feature_args += !!ti->num_discard_bios;
2880 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 2881 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
ff3af92b 2882 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 2883 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 2884 if (cc->on_disk_tag_size)
2885 num_feature_args++;
f3396c58
MP		 2886 if (num_feature_args) {
2887 DMEMIT(" %d", num_feature_args);
2888 if (ti->num_discard_bios)
2889 DMEMIT(" allow_discards");
2890 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
2891 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 2892 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
2893 DMEMIT(" submit_from_crypt_cpus");
ef43aa38
MB		 2894 if (cc->on_disk_tag_size)
2895 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 2896 if (cc->sector_size != (1 << SECTOR_SHIFT))
2897 DMEMIT(" sector_size:%d", cc->sector_size);
2898 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
2899 DMEMIT(" iv_large_sectors");
f3396c58 2900 }
772ae5f5 2901
1da177e4
LT		 2902 break;
2903 }
1da177e4
LT		 2904}
2905
e48d4bbf
MB		 2906static void crypt_postsuspend(struct dm_target *ti)
2907{
2908 struct crypt_config *cc = ti->private;
2909
2910 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2911}
2912
2913static int crypt_preresume(struct dm_target *ti)
2914{
2915 struct crypt_config *cc = ti->private;
2916
2917 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
2918 DMERR("aborting resume - crypt key is not set.");
2919 return -EAGAIN;
2920 }
2921
2922 return 0;
2923}
2924
2925static void crypt_resume(struct dm_target *ti)
2926{
2927 struct crypt_config *cc = ti->private;
2928
2929 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2930}
2931
2932/* Message interface
2933 * key set <key>
2934 * key wipe
2935 */
2936static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2937{
2938 struct crypt_config *cc = ti->private;
c538f6ec 2939 int key_size, ret = -EINVAL;
e48d4bbf
MB		 2940
2941 if (argc < 2)
2942 goto error;
2943
498f0103 2944 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 2945 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2946 DMWARN("not suspended during key manipulation.");
2947 return -EINVAL;
2948 }
498f0103 2949 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 2950 /* The key size may not be changed. */
2951 key_size = get_key_size(&argv[2]);
2952 if (key_size < 0 || cc->key_size != key_size) {
2953 memset(argv[2], '0', strlen(argv[2]));
2954 return -EINVAL;
2955 }
2956
542da317
MB		 2957 ret = crypt_set_key(cc, argv[2]);
2958 if (ret)
2959 return ret;
2960 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2961 ret = cc->iv_gen_ops->init(cc);
2962 return ret;
2963 }
498f0103 2964 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
542da317
MB		 2965 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2966 ret = cc->iv_gen_ops->wipe(cc);
2967 if (ret)
2968 return ret;
2969 }
e48d4bbf 2970 return crypt_wipe_key(cc);
542da317 2971 }
e48d4bbf
MB		 2972 }
2973
2974error:
2975 DMWARN("unrecognised message received.");
2976 return -EINVAL;
2977}
2978
af4874e0
MS		 2979static int crypt_iterate_devices(struct dm_target *ti,
2980 iterate_devices_callout_fn fn, void *data)
2981{
2982 struct crypt_config *cc = ti->private;
2983
5dea271b 2984 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 2985}
2986
586b286b
MS		 2987static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
2988{
8f0009a2
MB		 2989 struct crypt_config *cc = ti->private;
2990
586b286b
MS		 2991 /*
2992 * Unfortunate constraint that is required to avoid the potential
2993 * for exceeding underlying device's max_segments limits -- due to
2994 * crypt_alloc_buffer() possibly allocating pages for the encryption
2995 * bio that are not as physically contiguous as the original bio.
2996 */
2997 limits->max_segment_size = PAGE_SIZE;
8f0009a2
MB		 2998
2999 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
3000 limits->logical_block_size = cc->sector_size;
3001 limits->physical_block_size = cc->sector_size;
3002 blk_limits_io_min(limits, cc->sector_size);
3003 }
586b286b
MS		 3004}
3005
1da177e4
LT		 3006static struct target_type crypt_target = {
3007 .name = "crypt",
8f0009a2 3008 .version = {1, 17, 0},
1da177e4
LT		 3009 .module = THIS_MODULE,
3010 .ctr = crypt_ctr,
3011 .dtr = crypt_dtr,
3012 .map = crypt_map,
3013 .status = crypt_status,
e48d4bbf
MB		 3014 .postsuspend = crypt_postsuspend,
3015 .preresume = crypt_preresume,
3016 .resume = crypt_resume,
3017 .message = crypt_message,
af4874e0 3018 .iterate_devices = crypt_iterate_devices,
586b286b 3019 .io_hints = crypt_io_hints,
1da177e4
LT		 3020};
3021
3022static int __init dm_crypt_init(void)
3023{
3024 int r;
3025
1da177e4 3026 r = dm_register_target(&crypt_target);
94f5e024 3027 if (r < 0)
72d94861 3028 DMERR("register failed %d", r);
1da177e4 3029
1da177e4
LT		 3030 return r;
3031}
3032
3033static void __exit dm_crypt_exit(void)
3034{
10d3bd09 3035 dm_unregister_target(&crypt_target);
1da177e4
LT		 3036}
3037
3038module_init(dm_crypt_init);
3039module_exit(dm_crypt_exit);
3040
bf14299f 3041MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3042MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3043MODULE_LICENSE("GPL");
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