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Merge tag 'perf-urgent-2024-04-14' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-block.git] / drivers / md / dm-crypt.c
CommitLineData
3bd94003 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4 2/*
bf14299f 3 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 4 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
bbb16584
MB		 5 * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2013-2020 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 7 *
8 * This file is released under the GPL.
9 */
10
43d69034 11#include <linux/completion.h>
d1806f6a 12#include <linux/err.h>
1da177e4
LT		 13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
c538f6ec 16#include <linux/key.h>
1da177e4
LT		 17#include <linux/bio.h>
18#include <linux/blkdev.h>
fe45e630 19#include <linux/blk-integrity.h>
1da177e4
LT		 20#include <linux/mempool.h>
21#include <linux/slab.h>
22#include <linux/crypto.h>
23#include <linux/workqueue.h>
dc267621 24#include <linux/kthread.h>
3fcfab16 25#include <linux/backing-dev.h>
60063497 26#include <linux/atomic.h>
378f058c 27#include <linux/scatterlist.h>
b3c5fd30 28#include <linux/rbtree.h>
027c431c 29#include <linux/ctype.h>
1da177e4 30#include <asm/page.h>
48527fa7 31#include <asm/unaligned.h>
34745785
MB		 32#include <crypto/hash.h>
33#include <crypto/md5.h>
bbdb23b5 34#include <crypto/skcipher.h>
ef43aa38
MB		 35#include <crypto/aead.h>
36#include <crypto/authenc.h>
e3023094 37#include <crypto/utils.h>
ef43aa38 38#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
27f5411a 39#include <linux/key-type.h>
c538f6ec 40#include <keys/user-type.h>
27f5411a 41#include <keys/encrypted-type.h>
363880c4 42#include <keys/trusted-type.h>
1da177e4 43
586e80e6 44#include <linux/device-mapper.h>
1da177e4 45
58d0f180
MW		 46#include "dm-audit.h"
47
72d94861 48#define DM_MSG_PREFIX "crypt"
1da177e4 49
1da177e4
LT		 50/*
51 * context holding the current state of a multi-part conversion
52 */
53struct convert_context {
43d69034 54 struct completion restart;
1da177e4 55 struct bio *bio_in;
003b5c57 56 struct bvec_iter iter_in;
787f1b28 57 struct bio *bio_out;
003b5c57 58 struct bvec_iter iter_out;
40b6229b 59 atomic_t cc_pending;
787f1b28 60 u64 cc_sector;
ef43aa38
MB		 61 union {
62 struct skcipher_request *req;
63 struct aead_request *req_aead;
64 } r;
42e15d12
MP		 65 bool aead_recheck;
66 bool aead_failed;
ef43aa38 67
1da177e4
LT		 68};
69
53017030
MB		 70/*
71 * per bio private data
72 */
73struct dm_crypt_io {
49a8a920 74 struct crypt_config *cc;
53017030 75 struct bio *base_bio;
ef43aa38 76 u8 *integrity_metadata;
d9a02e01 77 bool integrity_metadata_from_pool:1;
d9a02e01 78
53017030
MB		 79 struct work_struct work;
80
81 struct convert_context ctx;
82
40b6229b 83 atomic_t io_pending;
4e4cbee9 84 blk_status_t error;
0c395b0f 85 sector_t sector;
dc267621 86
42e15d12
MP		 87 struct bvec_iter saved_bi_iter;
88
b3c5fd30 89 struct rb_node rb_node;
298a9fa0 90} CRYPTO_MINALIGN_ATTR;
53017030 91
01482b76 92struct dm_crypt_request {
b2174eeb 93 struct convert_context *ctx;
ef43aa38
MB		 94 struct scatterlist sg_in[4];
95 struct scatterlist sg_out[4];
8d683dcd 96 u64 iv_sector;
01482b76
MB		 97};
98
1da177e4
LT		 99struct crypt_config;
100
101struct crypt_iv_operations {
102 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 103 const char *opts);
1da177e4 104 void (*dtr)(struct crypt_config *cc);
b95bf2d3 105 int (*init)(struct crypt_config *cc);
542da317 106 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 107 int (*generator)(struct crypt_config *cc, u8 *iv,
108 struct dm_crypt_request *dmreq);
109 int (*post)(struct crypt_config *cc, u8 *iv,
110 struct dm_crypt_request *dmreq);
1da177e4
LT		 111};
112
60473592
MB		 113struct iv_benbi_private {
114 int shift;
115};
116
34745785
MB		 117#define LMK_SEED_SIZE 64 /* hash + 0 */
118struct iv_lmk_private {
119 struct crypto_shash *hash_tfm;
120 u8 *seed;
121};
122
ed04d981
MB		 123#define TCW_WHITENING_SIZE 16
124struct iv_tcw_private {
125 struct crypto_shash *crc32_tfm;
126 u8 *iv_seed;
127 u8 *whitening;
128};
129
bbb16584
MB		 130#define ELEPHANT_MAX_KEY_SIZE 32
131struct iv_elephant_private {
132 struct crypto_skcipher *tfm;
133};
134
1da177e4
LT		 135/*
136 * Crypt: maps a linear range of a block device
137 * and encrypts / decrypts at the same time.
138 */
0f5d8e6e 139enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
39d42fa9 140 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD,
8e225f04
DLM		 141 DM_CRYPT_NO_READ_WORKQUEUE, DM_CRYPT_NO_WRITE_WORKQUEUE,
142 DM_CRYPT_WRITE_INLINE };
c0297721 143
ef43aa38 144enum cipher_flags {
74d1da39 145 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */
8f0009a2 146 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */
bbb16584 147 CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */
ef43aa38
MB		 148};
149
c0297721 150/*
610f2de3 151 * The fields in here must be read only after initialization.
c0297721 152 */
1da177e4
LT		 153struct crypt_config {
154 struct dm_dev *dev;
155 sector_t start;
156
5059353d
MP		 157 struct percpu_counter n_allocated_pages;
158
cabf08e4
MB		 159 struct workqueue_struct *io_queue;
160 struct workqueue_struct *crypt_queue;
3f1e9070 161
c7329eff 162 spinlock_t write_thread_lock;
72d711c8 163 struct task_struct *write_thread;
b3c5fd30 164 struct rb_root write_tree;
dc267621 165
7dbcd137 166 char *cipher_string;
ef43aa38 167 char *cipher_auth;
c538f6ec 168 char *key_string;
5ebaee6d 169
1b1b58f5 170 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 171 union {
60473592 172 struct iv_benbi_private benbi;
34745785 173 struct iv_lmk_private lmk;
ed04d981 174 struct iv_tcw_private tcw;
bbb16584 175 struct iv_elephant_private elephant;
79066ad3 176 } iv_gen_private;
8d683dcd 177 u64 iv_offset;
1da177e4 178 unsigned int iv_size;
86a3238c 179 unsigned short sector_size;
ff3af92b 180 unsigned char sector_shift;
1da177e4 181
ef43aa38
MB		 182 union {
183 struct crypto_skcipher **tfms;
184 struct crypto_aead **tfms_aead;
185 } cipher_tfm;
86a3238c 186 unsigned int tfms_count;
ef43aa38 187 unsigned long cipher_flags;
c0297721 188
ddd42edf
MB		 189 /*
190 * Layout of each crypto request:
191 *
bbdb23b5 192 * struct skcipher_request
ddd42edf
MB		 193 * context
194 * padding
195 * struct dm_crypt_request
196 * padding
197 * IV
198 *
199 * The padding is added so that dm_crypt_request and the IV are
200 * correctly aligned.
201 */
202 unsigned int dmreq_start;
ddd42edf 203
298a9fa0
MP		 204 unsigned int per_bio_data_size;
205
e48d4bbf 206 unsigned long flags;
1da177e4 207 unsigned int key_size;
da31a078
MB		 208 unsigned int key_parts; /* independent parts in key buffer */
209 unsigned int key_extra_size; /* additional keys length */
ef43aa38
MB		 210 unsigned int key_mac_size; /* MAC key size for authenc(...) */
211
212 unsigned int integrity_tag_size;
213 unsigned int integrity_iv_size;
214 unsigned int on_disk_tag_size;
215
72d711c8
MS		 216 /*
217 * pool for per bio private data, crypto requests,
218 * encryption requeusts/buffer pages and integrity tags
219 */
86a3238c 220 unsigned int tag_pool_max_sectors;
72d711c8
MS		 221 mempool_t tag_pool;
222 mempool_t req_pool;
223 mempool_t page_pool;
224
225 struct bio_set bs;
226 struct mutex bio_alloc_lock;
227
ef43aa38 228 u8 *authenc_key; /* space for keys in authenc() format (if used) */
6521ba56 229 u8 key[] __counted_by(key_size);
1da177e4
LT		 230};
231
ef43aa38
MB		 232#define MIN_IOS 64
233#define MAX_TAG_SIZE 480
234#define POOL_ENTRY_SIZE 512
1da177e4 235
5059353d 236static DEFINE_SPINLOCK(dm_crypt_clients_lock);
2f06cd12 237static unsigned int dm_crypt_clients_n;
5059353d
MP		 238static volatile unsigned long dm_crypt_pages_per_client;
239#define DM_CRYPT_MEMORY_PERCENT 2
a8affc03 240#define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_VECS * 16)
5059353d 241
3f868c09 242static void crypt_endio(struct bio *clone);
395b167c 243static void kcryptd_queue_crypt(struct dm_crypt_io *io);
ef43aa38
MB		 244static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
245 struct scatterlist *sg);
027581f3 246
3fd53533
YY		 247static bool crypt_integrity_aead(struct crypt_config *cc);
248
c0297721 249/*
86f917ad 250 * Use this to access cipher attributes that are independent of the key.
c0297721 251 */
bbdb23b5 252static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 253{
ef43aa38
MB		 254 return cc->cipher_tfm.tfms[0];
255}
256
257static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
258{
259 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 260}
261
1da177e4
LT		 262/*
263 * Different IV generation algorithms:
264 *
3c164bd8 265 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 266 * number, padded with zeros if necessary.
1da177e4 267 *
61afef61
MB		 268 * plain64: the initial vector is the 64-bit little-endian version of the sector
269 * number, padded with zeros if necessary.
270 *
7e3fd855
MB		 271 * plain64be: the initial vector is the 64-bit big-endian version of the sector
272 * number, padded with zeros if necessary.
273 *
3c164bd8
RS		 274 * essiv: "encrypted sector|salt initial vector", the sector number is
275 * encrypted with the bulk cipher using a salt as key. The salt
276 * should be derived from the bulk cipher's key via hashing.
1da177e4 277 *
48527fa7
RS		 278 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
279 * (needed for LRW-32-AES and possible other narrow block modes)
280 *
46b47730
LN		 281 * null: the initial vector is always zero. Provides compatibility with
282 * obsolete loop_fish2 devices. Do not use for new devices.
283 *
34745785
MB		 284 * lmk: Compatible implementation of the block chaining mode used
285 * by the Loop-AES block device encryption system
286 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
287 * It operates on full 512 byte sectors and uses CBC
288 * with an IV derived from the sector number, the data and
289 * optionally extra IV seed.
290 * This means that after decryption the first block
291 * of sector must be tweaked according to decrypted data.
292 * Loop-AES can use three encryption schemes:
293 * version 1: is plain aes-cbc mode
294 * version 2: uses 64 multikey scheme with lmk IV generator
295 * version 3: the same as version 2 with additional IV seed
296 * (it uses 65 keys, last key is used as IV seed)
297 *
ed04d981
MB		 298 * tcw: Compatible implementation of the block chaining mode used
299 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 300 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 301 * It operates on full 512 byte sectors and uses CBC
302 * with an IV derived from initial key and the sector number.
303 * In addition, whitening value is applied on every sector, whitening
304 * is calculated from initial key, sector number and mixed using CRC32.
305 * Note that this encryption scheme is vulnerable to watermarking attacks
306 * and should be used for old compatible containers access only.
b9411d73
MB		 307 *
308 * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode)
309 * The IV is encrypted little-endian byte-offset (with the same key
310 * and cipher as the volume).
bbb16584
MB		 311 *
312 * elephant: The extended version of eboiv with additional Elephant diffuser
313 * used with Bitlocker CBC mode.
314 * This mode was used in older Windows systems
6f3bc22b 315 * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf
1da177e4
LT		 316 */
317
2dc5327d
MB		 318static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
319 struct dm_crypt_request *dmreq)
1da177e4
LT		 320{
321 memset(iv, 0, cc->iv_size);
283a8328 322 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 323
324 return 0;
325}
326
61afef61 327static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 328 struct dm_crypt_request *dmreq)
61afef61
MB		 329{
330 memset(iv, 0, cc->iv_size);
283a8328 331 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 332
333 return 0;
334}
335
7e3fd855
MB		 336static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv,
337 struct dm_crypt_request *dmreq)
338{
339 memset(iv, 0, cc->iv_size);
340 /* iv_size is at least of size u64; usually it is 16 bytes */
341 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector);
342
343 return 0;
344}
345
2dc5327d
MB		 346static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
347 struct dm_crypt_request *dmreq)
1da177e4 348{
a1a262b6
AB		 349 /*
350 * ESSIV encryption of the IV is now handled by the crypto API,
351 * so just pass the plain sector number here.
352 */
1da177e4 353 memset(iv, 0, cc->iv_size);
283a8328 354 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721 355
1da177e4
LT		 356 return 0;
357}
358
48527fa7
RS		 359static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
360 const char *opts)
361{
86a3238c 362 unsigned int bs;
4ea9471f
MB		 363 int log;
364
3fd53533 365 if (crypt_integrity_aead(cc))
4ea9471f
MB		 366 bs = crypto_aead_blocksize(any_tfm_aead(cc));
367 else
368 bs = crypto_skcipher_blocksize(any_tfm(cc));
369 log = ilog2(bs);
48527fa7 370
a4a82ce3
HM		 371 /*
372 * We need to calculate how far we must shift the sector count
373 * to get the cipher block count, we use this shift in _gen.
374 */
48527fa7
RS		 375 if (1 << log != bs) {
376 ti->error = "cypher blocksize is not a power of 2";
377 return -EINVAL;
378 }
379
380 if (log > 9) {
381 ti->error = "cypher blocksize is > 512";
382 return -EINVAL;
383 }
384
60473592 385 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 386
387 return 0;
388}
389
390static void crypt_iv_benbi_dtr(struct crypt_config *cc)
391{
48527fa7
RS		 392}
393
2dc5327d
MB		 394static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
395 struct dm_crypt_request *dmreq)
48527fa7 396{
79066ad3
HX		 397 __be64 val;
398
48527fa7 399 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 400
2dc5327d 401 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 402 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 403
1da177e4
LT		 404 return 0;
405}
406
2dc5327d
MB		 407static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
408 struct dm_crypt_request *dmreq)
46b47730
LN		 409{
410 memset(iv, 0, cc->iv_size);
411
412 return 0;
413}
414
34745785
MB		 415static void crypt_iv_lmk_dtr(struct crypt_config *cc)
416{
417 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
418
419 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
420 crypto_free_shash(lmk->hash_tfm);
421 lmk->hash_tfm = NULL;
422
453431a5 423 kfree_sensitive(lmk->seed);
34745785
MB		 424 lmk->seed = NULL;
425}
426
427static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
428 const char *opts)
429{
430 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
431
8f0009a2
MB		 432 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
433 ti->error = "Unsupported sector size for LMK";
434 return -EINVAL;
435 }
436
cd746938
MP		 437 lmk->hash_tfm = crypto_alloc_shash("md5", 0,
438 CRYPTO_ALG_ALLOCATES_MEMORY);
34745785
MB		 439 if (IS_ERR(lmk->hash_tfm)) {
440 ti->error = "Error initializing LMK hash";
441 return PTR_ERR(lmk->hash_tfm);
442 }
443
444 /* No seed in LMK version 2 */
445 if (cc->key_parts == cc->tfms_count) {
446 lmk->seed = NULL;
447 return 0;
448 }
449
450 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
451 if (!lmk->seed) {
452 crypt_iv_lmk_dtr(cc);
453 ti->error = "Error kmallocing seed storage in LMK";
454 return -ENOMEM;
455 }
456
457 return 0;
458}
459
460static int crypt_iv_lmk_init(struct crypt_config *cc)
461{
462 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
463 int subkey_size = cc->key_size / cc->key_parts;
464
465 /* LMK seed is on the position of LMK_KEYS + 1 key */
466 if (lmk->seed)
467 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
468 crypto_shash_digestsize(lmk->hash_tfm));
469
470 return 0;
471}
472
473static int crypt_iv_lmk_wipe(struct crypt_config *cc)
474{
475 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
476
477 if (lmk->seed)
478 memset(lmk->seed, 0, LMK_SEED_SIZE);
479
480 return 0;
481}
482
483static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
484 struct dm_crypt_request *dmreq,
485 u8 *data)
486{
487 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 488 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 489 struct md5_state md5state;
da31a078 490 __le32 buf[4];
34745785
MB		 491 int i, r;
492
b6106265 493 desc->tfm = lmk->hash_tfm;
34745785 494
b6106265 495 r = crypto_shash_init(desc);
34745785
MB		 496 if (r)
497 return r;
498
499 if (lmk->seed) {
b6106265 500 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 501 if (r)
502 return r;
503 }
504
505 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 506 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 507 if (r)
508 return r;
509
510 /* Sector is cropped to 56 bits here */
511 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
512 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
513 buf[2] = cpu_to_le32(4024);
514 buf[3] = 0;
b6106265 515 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 516 if (r)
517 return r;
518
519 /* No MD5 padding here */
b6106265 520 r = crypto_shash_export(desc, &md5state);
34745785
MB		 521 if (r)
522 return r;
523
524 for (i = 0; i < MD5_HASH_WORDS; i++)
525 __cpu_to_le32s(&md5state.hash[i]);
526 memcpy(iv, &md5state.hash, cc->iv_size);
527
528 return 0;
529}
530
531static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
532 struct dm_crypt_request *dmreq)
533{
ef43aa38 534 struct scatterlist *sg;
34745785
MB		 535 u8 *src;
536 int r = 0;
537
538 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38 539 sg = crypt_get_sg_data(cc, dmreq->sg_in);
0d78954a 540 src = kmap_local_page(sg_page(sg));
ef43aa38 541 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
0d78954a 542 kunmap_local(src);
34745785
MB		 543 } else
544 memset(iv, 0, cc->iv_size);
545
546 return r;
547}
548
549static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
550 struct dm_crypt_request *dmreq)
551{
ef43aa38 552 struct scatterlist *sg;
34745785
MB		 553 u8 *dst;
554 int r;
555
556 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
557 return 0;
558
ef43aa38 559 sg = crypt_get_sg_data(cc, dmreq->sg_out);
0d78954a 560 dst = kmap_local_page(sg_page(sg));
ef43aa38 561 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 562
563 /* Tweak the first block of plaintext sector */
564 if (!r)
ef43aa38 565 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 566
0d78954a 567 kunmap_local(dst);
34745785
MB		 568 return r;
569}
570
ed04d981
MB		 571static void crypt_iv_tcw_dtr(struct crypt_config *cc)
572{
573 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
574
453431a5 575 kfree_sensitive(tcw->iv_seed);
ed04d981 576 tcw->iv_seed = NULL;
453431a5 577 kfree_sensitive(tcw->whitening);
ed04d981
MB		 578 tcw->whitening = NULL;
579
580 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
581 crypto_free_shash(tcw->crc32_tfm);
582 tcw->crc32_tfm = NULL;
583}
584
585static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
586 const char *opts)
587{
588 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
589
8f0009a2
MB		 590 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
591 ti->error = "Unsupported sector size for TCW";
592 return -EINVAL;
593 }
594
ed04d981
MB		 595 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
596 ti->error = "Wrong key size for TCW";
597 return -EINVAL;
598 }
599
cd746938
MP		 600 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0,
601 CRYPTO_ALG_ALLOCATES_MEMORY);
ed04d981
MB		 602 if (IS_ERR(tcw->crc32_tfm)) {
603 ti->error = "Error initializing CRC32 in TCW";
604 return PTR_ERR(tcw->crc32_tfm);
605 }
606
607 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
608 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
609 if (!tcw->iv_seed || !tcw->whitening) {
610 crypt_iv_tcw_dtr(cc);
611 ti->error = "Error allocating seed storage in TCW";
612 return -ENOMEM;
613 }
614
615 return 0;
616}
617
618static int crypt_iv_tcw_init(struct crypt_config *cc)
619{
620 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
621 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
622
623 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
624 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
625 TCW_WHITENING_SIZE);
626
627 return 0;
628}
629
630static int crypt_iv_tcw_wipe(struct crypt_config *cc)
631{
632 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
633
634 memset(tcw->iv_seed, 0, cc->iv_size);
635 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
636
637 return 0;
638}
639
640static int crypt_iv_tcw_whitening(struct crypt_config *cc,
641 struct dm_crypt_request *dmreq,
642 u8 *data)
643{
644 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 645 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 646 u8 buf[TCW_WHITENING_SIZE];
b6106265 647 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 648 int i, r;
649
650 /* xor whitening with sector number */
45fe93df
AB		 651 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
652 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 653
654 /* calculate crc32 for every 32bit part and xor it */
b6106265 655 desc->tfm = tcw->crc32_tfm;
ed04d981 656 for (i = 0; i < 4; i++) {
6d0ee3b6 657 r = crypto_shash_digest(desc, &buf[i * 4], 4, &buf[i * 4]);
ed04d981
MB		 658 if (r)
659 goto out;
660 }
661 crypto_xor(&buf[0], &buf[12], 4);
662 crypto_xor(&buf[4], &buf[8], 4);
663
664 /* apply whitening (8 bytes) to whole sector */
665 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
666 crypto_xor(data + i * 8, buf, 8);
667out:
1a71d6ff 668 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 669 return r;
670}
671
672static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
673 struct dm_crypt_request *dmreq)
674{
ef43aa38 675 struct scatterlist *sg;
ed04d981 676 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 677 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 678 u8 *src;
679 int r = 0;
680
681 /* Remove whitening from ciphertext */
682 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38 683 sg = crypt_get_sg_data(cc, dmreq->sg_in);
0d78954a 684 src = kmap_local_page(sg_page(sg));
ef43aa38 685 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
0d78954a 686 kunmap_local(src);
ed04d981
MB		 687 }
688
689 /* Calculate IV */
45fe93df 690 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 691 if (cc->iv_size > 8)
45fe93df
AB		 692 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
693 cc->iv_size - 8);
ed04d981
MB		 694
695 return r;
696}
697
698static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
699 struct dm_crypt_request *dmreq)
700{
ef43aa38 701 struct scatterlist *sg;
ed04d981
MB		 702 u8 *dst;
703 int r;
704
705 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
706 return 0;
707
708 /* Apply whitening on ciphertext */
ef43aa38 709 sg = crypt_get_sg_data(cc, dmreq->sg_out);
0d78954a 710 dst = kmap_local_page(sg_page(sg));
ef43aa38 711 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
0d78954a 712 kunmap_local(dst);
ed04d981
MB		 713
714 return r;
715}
716
ef43aa38
MB		 717static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
718 struct dm_crypt_request *dmreq)
719{
720 /* Used only for writes, there must be an additional space to store IV */
721 get_random_bytes(iv, cc->iv_size);
722 return 0;
723}
724
b9411d73
MB		 725static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti,
726 const char *opts)
727{
3fd53533 728 if (crypt_integrity_aead(cc)) {
39d13a1a
AB		 729 ti->error = "AEAD transforms not supported for EBOIV";
730 return -EINVAL;
b9411d73
MB		 731 }
732
39d13a1a 733 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) {
2e84fecf 734 ti->error = "Block size of EBOIV cipher does not match IV size of block cipher";
b9411d73
MB		 735 return -EINVAL;
736 }
737
b9411d73
MB		 738 return 0;
739}
740
39d13a1a
AB		 741static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
742 struct dm_crypt_request *dmreq)
b9411d73 743{
e3023094 744 struct crypto_skcipher *tfm = any_tfm(cc);
39d13a1a
AB		 745 struct skcipher_request *req;
746 struct scatterlist src, dst;
7785a9e4 747 DECLARE_CRYPTO_WAIT(wait);
e3023094 748 unsigned int reqsize;
b9411d73 749 int err;
e3023094 750 u8 *buf;
b9411d73 751
152d0bcd
HX		 752 reqsize = sizeof(*req) + crypto_skcipher_reqsize(tfm);
753 reqsize = ALIGN(reqsize, __alignof__(__le64));
e3023094
HX		 754
755 req = kmalloc(reqsize + cc->iv_size, GFP_NOIO);
39d13a1a
AB		 756 if (!req)
757 return -ENOMEM;
b9411d73 758
e3023094
HX		 759 skcipher_request_set_tfm(req, tfm);
760
761 buf = (u8 *)req + reqsize;
39d13a1a
AB		 762 memset(buf, 0, cc->iv_size);
763 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
b9411d73 764
39d13a1a
AB		 765 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size);
766 sg_init_one(&dst, iv, cc->iv_size);
767 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf);
768 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
769 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
e3023094 770 kfree_sensitive(req);
b9411d73 771
39d13a1a 772 return err;
b9411d73
MB		 773}
774
bbb16584
MB		 775static void crypt_iv_elephant_dtr(struct crypt_config *cc)
776{
777 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
778
779 crypto_free_skcipher(elephant->tfm);
780 elephant->tfm = NULL;
781}
782
783static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti,
784 const char *opts)
785{
786 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
787 int r;
788
cd746938
MP		 789 elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0,
790 CRYPTO_ALG_ALLOCATES_MEMORY);
bbb16584
MB		 791 if (IS_ERR(elephant->tfm)) {
792 r = PTR_ERR(elephant->tfm);
793 elephant->tfm = NULL;
794 return r;
795 }
796
797 r = crypt_iv_eboiv_ctr(cc, ti, NULL);
798 if (r)
799 crypt_iv_elephant_dtr(cc);
800 return r;
801}
802
803static void diffuser_disk_to_cpu(u32 *d, size_t n)
804{
805#ifndef __LITTLE_ENDIAN
806 int i;
807
808 for (i = 0; i < n; i++)
809 d[i] = le32_to_cpu((__le32)d[i]);
810#endif
811}
812
813static void diffuser_cpu_to_disk(__le32 *d, size_t n)
814{
815#ifndef __LITTLE_ENDIAN
816 int i;
817
818 for (i = 0; i < n; i++)
819 d[i] = cpu_to_le32((u32)d[i]);
820#endif
821}
822
823static void diffuser_a_decrypt(u32 *d, size_t n)
824{
825 int i, i1, i2, i3;
826
827 for (i = 0; i < 5; i++) {
828 i1 = 0;
829 i2 = n - 2;
830 i3 = n - 5;
831
832 while (i1 < (n - 1)) {
833 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
834 i1++; i2++; i3++;
835
836 if (i3 >= n)
837 i3 -= n;
838
839 d[i1] += d[i2] ^ d[i3];
840 i1++; i2++; i3++;
841
842 if (i2 >= n)
843 i2 -= n;
844
845 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
846 i1++; i2++; i3++;
847
848 d[i1] += d[i2] ^ d[i3];
849 i1++; i2++; i3++;
850 }
851 }
852}
853
854static void diffuser_a_encrypt(u32 *d, size_t n)
855{
856 int i, i1, i2, i3;
857
858 for (i = 0; i < 5; i++) {
859 i1 = n - 1;
860 i2 = n - 2 - 1;
861 i3 = n - 5 - 1;
862
863 while (i1 > 0) {
864 d[i1] -= d[i2] ^ d[i3];
865 i1--; i2--; i3--;
866
867 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
868 i1--; i2--; i3--;
869
870 if (i2 < 0)
871 i2 += n;
872
873 d[i1] -= d[i2] ^ d[i3];
874 i1--; i2--; i3--;
875
876 if (i3 < 0)
877 i3 += n;
878
879 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
880 i1--; i2--; i3--;
881 }
882 }
883}
884
885static void diffuser_b_decrypt(u32 *d, size_t n)
886{
887 int i, i1, i2, i3;
888
889 for (i = 0; i < 3; i++) {
890 i1 = 0;
891 i2 = 2;
892 i3 = 5;
893
894 while (i1 < (n - 1)) {
895 d[i1] += d[i2] ^ d[i3];
896 i1++; i2++; i3++;
897
898 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
899 i1++; i2++; i3++;
900
901 if (i2 >= n)
902 i2 -= n;
903
904 d[i1] += d[i2] ^ d[i3];
905 i1++; i2++; i3++;
906
907 if (i3 >= n)
908 i3 -= n;
909
910 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
911 i1++; i2++; i3++;
912 }
913 }
914}
915
916static void diffuser_b_encrypt(u32 *d, size_t n)
917{
918 int i, i1, i2, i3;
919
920 for (i = 0; i < 3; i++) {
921 i1 = n - 1;
922 i2 = 2 - 1;
923 i3 = 5 - 1;
924
925 while (i1 > 0) {
926 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
927 i1--; i2--; i3--;
928
929 if (i3 < 0)
930 i3 += n;
931
932 d[i1] -= d[i2] ^ d[i3];
933 i1--; i2--; i3--;
934
935 if (i2 < 0)
936 i2 += n;
937
938 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
939 i1--; i2--; i3--;
940
941 d[i1] -= d[i2] ^ d[i3];
942 i1--; i2--; i3--;
943 }
944 }
945}
946
947static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq)
948{
949 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
950 u8 *es, *ks, *data, *data2, *data_offset;
951 struct skcipher_request *req;
952 struct scatterlist *sg, *sg2, src, dst;
7785a9e4 953 DECLARE_CRYPTO_WAIT(wait);
bbb16584
MB		 954 int i, r;
955
956 req = skcipher_request_alloc(elephant->tfm, GFP_NOIO);
957 es = kzalloc(16, GFP_NOIO); /* Key for AES */
958 ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */
959
960 if (!req || !es || !ks) {
961 r = -ENOMEM;
962 goto out;
963 }
964
965 *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
966
967 /* E(Ks, e(s)) */
968 sg_init_one(&src, es, 16);
969 sg_init_one(&dst, ks, 16);
970 skcipher_request_set_crypt(req, &src, &dst, 16, NULL);
971 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
972 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
973 if (r)
974 goto out;
975
976 /* E(Ks, e'(s)) */
977 es[15] = 0x80;
978 sg_init_one(&dst, &ks[16], 16);
979 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
980 if (r)
981 goto out;
982
983 sg = crypt_get_sg_data(cc, dmreq->sg_out);
0d78954a 984 data = kmap_local_page(sg_page(sg));
bbb16584
MB		 985 data_offset = data + sg->offset;
986
987 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */
988 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
989 sg2 = crypt_get_sg_data(cc, dmreq->sg_in);
0d78954a 990 data2 = kmap_local_page(sg_page(sg2));
bbb16584 991 memcpy(data_offset, data2 + sg2->offset, cc->sector_size);
0d78954a 992 kunmap_local(data2);
bbb16584
MB		 993 }
994
995 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ced6e475
HM		 996 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32));
997 diffuser_b_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32));
998 diffuser_a_decrypt((u32 *)data_offset, cc->sector_size / sizeof(u32));
999 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32));
bbb16584
MB		 1000 }
1001
1002 for (i = 0; i < (cc->sector_size / 32); i++)
1003 crypto_xor(data_offset + i * 32, ks, 32);
1004
1005 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ced6e475
HM		 1006 diffuser_disk_to_cpu((u32 *)data_offset, cc->sector_size / sizeof(u32));
1007 diffuser_a_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32));
1008 diffuser_b_encrypt((u32 *)data_offset, cc->sector_size / sizeof(u32));
1009 diffuser_cpu_to_disk((__le32 *)data_offset, cc->sector_size / sizeof(u32));
bbb16584
MB		 1010 }
1011
0d78954a 1012 kunmap_local(data);
bbb16584 1013out:
453431a5
WL		 1014 kfree_sensitive(ks);
1015 kfree_sensitive(es);
bbb16584
MB		 1016 skcipher_request_free(req);
1017 return r;
1018}
1019
1020static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv,
1021 struct dm_crypt_request *dmreq)
1022{
1023 int r;
1024
1025 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
1026 r = crypt_iv_elephant(cc, dmreq);
1027 if (r)
1028 return r;
1029 }
1030
1031 return crypt_iv_eboiv_gen(cc, iv, dmreq);
1032}
1033
1034static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv,
1035 struct dm_crypt_request *dmreq)
1036{
1037 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
1038 return crypt_iv_elephant(cc, dmreq);
1039
1040 return 0;
1041}
1042
1043static int crypt_iv_elephant_init(struct crypt_config *cc)
1044{
1045 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1046 int key_offset = cc->key_size - cc->key_extra_size;
1047
1048 return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size);
1049}
1050
1051static int crypt_iv_elephant_wipe(struct crypt_config *cc)
1052{
1053 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1054 u8 key[ELEPHANT_MAX_KEY_SIZE];
1055
1056 memset(key, 0, cc->key_extra_size);
1057 return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size);
1058}
1059
1b1b58f5 1060static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 1061 .generator = crypt_iv_plain_gen
1062};
1063
1b1b58f5 1064static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 1065 .generator = crypt_iv_plain64_gen
1066};
1067
7e3fd855
MB		 1068static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
1069 .generator = crypt_iv_plain64be_gen
1070};
1071
1b1b58f5 1072static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 1073 .generator = crypt_iv_essiv_gen
1074};
1075
1b1b58f5 1076static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 1077 .ctr = crypt_iv_benbi_ctr,
1078 .dtr = crypt_iv_benbi_dtr,
1079 .generator = crypt_iv_benbi_gen
1080};
1da177e4 1081
1b1b58f5 1082static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 1083 .generator = crypt_iv_null_gen
1084};
1085
1b1b58f5 1086static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 1087 .ctr = crypt_iv_lmk_ctr,
1088 .dtr = crypt_iv_lmk_dtr,
1089 .init = crypt_iv_lmk_init,
1090 .wipe = crypt_iv_lmk_wipe,
1091 .generator = crypt_iv_lmk_gen,
1092 .post = crypt_iv_lmk_post
1093};
1094
1b1b58f5 1095static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 1096 .ctr = crypt_iv_tcw_ctr,
1097 .dtr = crypt_iv_tcw_dtr,
1098 .init = crypt_iv_tcw_init,
1099 .wipe = crypt_iv_tcw_wipe,
1100 .generator = crypt_iv_tcw_gen,
1101 .post = crypt_iv_tcw_post
1102};
1103
e8dc79d1 1104static const struct crypt_iv_operations crypt_iv_random_ops = {
ef43aa38
MB		 1105 .generator = crypt_iv_random_gen
1106};
1107
e8dc79d1 1108static const struct crypt_iv_operations crypt_iv_eboiv_ops = {
b9411d73 1109 .ctr = crypt_iv_eboiv_ctr,
b9411d73
MB		 1110 .generator = crypt_iv_eboiv_gen
1111};
1112
e8dc79d1 1113static const struct crypt_iv_operations crypt_iv_elephant_ops = {
bbb16584
MB		 1114 .ctr = crypt_iv_elephant_ctr,
1115 .dtr = crypt_iv_elephant_dtr,
1116 .init = crypt_iv_elephant_init,
1117 .wipe = crypt_iv_elephant_wipe,
1118 .generator = crypt_iv_elephant_gen,
1119 .post = crypt_iv_elephant_post
1120};
1121
ef43aa38
MB		 1122/*
1123 * Integrity extensions
1124 */
1125static bool crypt_integrity_aead(struct crypt_config *cc)
1126{
1127 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
1128}
1129
1130static bool crypt_integrity_hmac(struct crypt_config *cc)
1131{
33d2f09f 1132 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 1133}
1134
1135/* Get sg containing data */
1136static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
1137 struct scatterlist *sg)
1138{
33d2f09f 1139 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 1140 return &sg[2];
1141
1142 return sg;
1143}
1144
1145static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
1146{
1147 struct bio_integrity_payload *bip;
1148 unsigned int tag_len;
1149 int ret;
1150
1151 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
1152 return 0;
1153
1154 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
1155 if (IS_ERR(bip))
1156 return PTR_ERR(bip);
1157
ff0c129d 1158 tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift);
ef43aa38 1159
ef43aa38
MB		 1160 bip->bip_iter.bi_sector = io->cc->start + io->sector;
1161
ef43aa38
MB		 1162 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
1163 tag_len, offset_in_page(io->integrity_metadata));
1164 if (unlikely(ret != tag_len))
1165 return -ENOMEM;
1166
1167 return 0;
1168}
1169
1170static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
1171{
1172#ifdef CONFIG_BLK_DEV_INTEGRITY
1173 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
7a1cd723 1174 struct mapped_device *md = dm_table_get_md(ti->table);
ef43aa38
MB		 1175
1176 /* From now we require underlying device with our integrity profile */
1177 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
1178 ti->error = "Integrity profile not supported.";
1179 return -EINVAL;
1180 }
1181
583fe747
MP		 1182 if (bi->tag_size != cc->on_disk_tag_size ||
1183 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 1184 ti->error = "Integrity profile tag size mismatch.";
1185 return -EINVAL;
1186 }
583fe747
MP		 1187 if (1 << bi->interval_exp != cc->sector_size) {
1188 ti->error = "Integrity profile sector size mismatch.";
1189 return -EINVAL;
1190 }
ef43aa38 1191
33d2f09f 1192 if (crypt_integrity_aead(cc)) {
ef43aa38 1193 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
7a1cd723 1194 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md),
ef43aa38
MB		 1195 cc->integrity_tag_size, cc->integrity_iv_size);
1196
1197 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
1198 ti->error = "Integrity AEAD auth tag size is not supported.";
1199 return -EINVAL;
1200 }
1201 } else if (cc->integrity_iv_size)
7a1cd723 1202 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md),
ef43aa38
MB		 1203 cc->integrity_iv_size);
1204
1205 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
1206 ti->error = "Not enough space for integrity tag in the profile.";
1207 return -EINVAL;
1208 }
1209
1210 return 0;
1211#else
1212 ti->error = "Integrity profile not supported.";
1213 return -EINVAL;
1214#endif
1215}
1216
d469f841
MB		 1217static void crypt_convert_init(struct crypt_config *cc,
1218 struct convert_context *ctx,
1219 struct bio *bio_out, struct bio *bio_in,
fcd369da 1220 sector_t sector)
1da177e4
LT		 1221{
1222 ctx->bio_in = bio_in;
1223 ctx->bio_out = bio_out;
003b5c57
KO		 1224 if (bio_in)
1225 ctx->iter_in = bio_in->bi_iter;
1226 if (bio_out)
1227 ctx->iter_out = bio_out->bi_iter;
c66029f4 1228 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1229 init_completion(&ctx->restart);
1da177e4
LT		 1230}
1231
b2174eeb 1232static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1233 void *req)
b2174eeb
HY		 1234{
1235 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1236}
1237
ef43aa38 1238static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1239{
ef43aa38 1240 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1241}
1242
2dc5327d
MB		 1243static u8 *iv_of_dmreq(struct crypt_config *cc,
1244 struct dm_crypt_request *dmreq)
1245{
33d2f09f 1246 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1247 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1248 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1249 else
1250 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1251 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1252}
1253
ef43aa38
MB		 1254static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1255 struct dm_crypt_request *dmreq)
1256{
1257 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1258}
1259
c13b5487 1260static __le64 *org_sector_of_dmreq(struct crypt_config *cc,
ef43aa38
MB		 1261 struct dm_crypt_request *dmreq)
1262{
1263 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
0ef0b471 1264
c13b5487 1265 return (__le64 *) ptr;
ef43aa38
MB		 1266}
1267
1268static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1269 struct dm_crypt_request *dmreq)
1270{
1271 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1272 cc->iv_size + sizeof(uint64_t);
0ef0b471 1273
ced6e475 1274 return (unsigned int *)ptr;
ef43aa38
MB		 1275}
1276
1277static void *tag_from_dmreq(struct crypt_config *cc,
1278 struct dm_crypt_request *dmreq)
1279{
1280 struct convert_context *ctx = dmreq->ctx;
1281 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1282
1283 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1284 cc->on_disk_tag_size];
1285}
1286
1287static void *iv_tag_from_dmreq(struct crypt_config *cc,
1288 struct dm_crypt_request *dmreq)
1289{
1290 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1291}
1292
1293static int crypt_convert_block_aead(struct crypt_config *cc,
1294 struct convert_context *ctx,
1295 struct aead_request *req,
1296 unsigned int tag_offset)
01482b76 1297{
003b5c57
KO		 1298 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1299 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1300 struct dm_crypt_request *dmreq;
ef43aa38 1301 u8 *iv, *org_iv, *tag_iv, *tag;
c13b5487 1302 __le64 *sector;
ef43aa38
MB		 1303 int r = 0;
1304
1305 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1306
8f0009a2 1307 /* Reject unexpected unaligned bio. */
0440d5c0 1308 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1309 return -EIO;
3a7f6c99 1310
b2174eeb 1311 dmreq = dmreq_of_req(cc, req);
ef43aa38 1312 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1313 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1314 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1315 dmreq->ctx = ctx;
1316
1317 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1318
1319 sector = org_sector_of_dmreq(cc, dmreq);
1320 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1321
2dc5327d 1322 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1323 org_iv = org_iv_of_dmreq(cc, dmreq);
1324 tag = tag_from_dmreq(cc, dmreq);
1325 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1326
1327 /* AEAD request:
1328 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1329 * | (authenticated) | (auth+encryption) | |
1330 * | sector_LE | IV | sector in/out | tag in/out |
1331 */
1332 sg_init_table(dmreq->sg_in, 4);
1333 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1334 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1335 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1336 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1337
1338 sg_init_table(dmreq->sg_out, 4);
1339 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1340 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1341 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1342 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1343
1344 if (cc->iv_gen_ops) {
1345 /* For READs use IV stored in integrity metadata */
1346 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1347 memcpy(org_iv, tag_iv, cc->iv_size);
1348 } else {
1349 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1350 if (r < 0)
1351 return r;
1352 /* Store generated IV in integrity metadata */
1353 if (cc->integrity_iv_size)
1354 memcpy(tag_iv, org_iv, cc->iv_size);
1355 }
1356 /* Working copy of IV, to be modified in crypto API */
1357 memcpy(iv, org_iv, cc->iv_size);
1358 }
1359
1360 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1361 if (bio_data_dir(ctx->bio_in) == WRITE) {
1362 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1363 cc->sector_size, iv);
ef43aa38
MB		 1364 r = crypto_aead_encrypt(req);
1365 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1366 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1367 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1368 } else {
1369 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1370 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1371 r = crypto_aead_decrypt(req);
1372 }
1373
f710126c 1374 if (r == -EBADMSG) {
58d0f180
MW		 1375 sector_t s = le64_to_cpu(*sector);
1376
42e15d12
MP		 1377 ctx->aead_failed = true;
1378 if (ctx->aead_recheck) {
1379 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu",
1380 ctx->bio_in->bi_bdev, s);
1381 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead",
1382 ctx->bio_in, s, 0);
1383 }
f710126c 1384 }
ef43aa38
MB		 1385
1386 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1387 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1388
8f0009a2
MB		 1389 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1390 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1391
ef43aa38
MB		 1392 return r;
1393}
1394
1395static int crypt_convert_block_skcipher(struct crypt_config *cc,
1396 struct convert_context *ctx,
1397 struct skcipher_request *req,
1398 unsigned int tag_offset)
1399{
1400 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1401 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1402 struct scatterlist *sg_in, *sg_out;
1403 struct dm_crypt_request *dmreq;
ef43aa38 1404 u8 *iv, *org_iv, *tag_iv;
c13b5487 1405 __le64 *sector;
ef43aa38 1406 int r = 0;
01482b76 1407
8f0009a2 1408 /* Reject unexpected unaligned bio. */
0440d5c0 1409 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1410 return -EIO;
1411
ef43aa38 1412 dmreq = dmreq_of_req(cc, req);
c66029f4 1413 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1414 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1415 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1416 dmreq->ctx = ctx;
01482b76 1417
ef43aa38
MB		 1418 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1419
1420 iv = iv_of_dmreq(cc, dmreq);
1421 org_iv = org_iv_of_dmreq(cc, dmreq);
1422 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1423
1424 sector = org_sector_of_dmreq(cc, dmreq);
1425 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1426
1427 /* For skcipher we use only the first sg item */
1428 sg_in = &dmreq->sg_in[0];
1429 sg_out = &dmreq->sg_out[0];
01482b76 1430
ef43aa38 1431 sg_init_table(sg_in, 1);
8f0009a2 1432 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1433
1434 sg_init_table(sg_out, 1);
8f0009a2 1435 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1436
3a7f6c99 1437 if (cc->iv_gen_ops) {
ef43aa38
MB		 1438 /* For READs use IV stored in integrity metadata */
1439 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1440 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1441 } else {
1442 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1443 if (r < 0)
1444 return r;
bbb16584
MB		 1445 /* Data can be already preprocessed in generator */
1446 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags))
1447 sg_in = sg_out;
ef43aa38
MB		 1448 /* Store generated IV in integrity metadata */
1449 if (cc->integrity_iv_size)
1450 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1451 }
1452 /* Working copy of IV, to be modified in crypto API */
1453 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1454 }
1455
8f0009a2 1456 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1457
1458 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1459 r = crypto_skcipher_encrypt(req);
3a7f6c99 1460 else
bbdb23b5 1461 r = crypto_skcipher_decrypt(req);
3a7f6c99 1462
2dc5327d 1463 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1464 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1465
8f0009a2
MB		 1466 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1467 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1468
3a7f6c99 1469 return r;
01482b76
MB		 1470}
1471
dcfe653d 1472static void kcryptd_async_done(void *async_req, int error);
c0297721 1473
d68b2958 1474static int crypt_alloc_req_skcipher(struct crypt_config *cc,
ef43aa38 1475 struct convert_context *ctx)
ddd42edf 1476{
86a3238c 1477 unsigned int key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1478
d68b2958
IK		 1479 if (!ctx->r.req) {
1480 ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
1481 if (!ctx->r.req)
1482 return -ENOMEM;
1483 }
c0297721 1484
ef43aa38 1485 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1486
1487 /*
1488 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1489 * requests if driver request queue is full.
1490 */
ef43aa38 1491 skcipher_request_set_callback(ctx->r.req,
432061b3 1492 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1493 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
d68b2958
IK		 1494
1495 return 0;
ddd42edf
MB		 1496}
1497
d68b2958 1498static int crypt_alloc_req_aead(struct crypt_config *cc,
ef43aa38
MB		 1499 struct convert_context *ctx)
1500{
004b8ae9
IK		 1501 if (!ctx->r.req_aead) {
1502 ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
1503 if (!ctx->r.req_aead)
d68b2958
IK		 1504 return -ENOMEM;
1505 }
c0297721 1506
ef43aa38 1507 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1508
1509 /*
1510 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1511 * requests if driver request queue is full.
1512 */
ef43aa38 1513 aead_request_set_callback(ctx->r.req_aead,
432061b3 1514 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1515 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
d68b2958
IK		 1516
1517 return 0;
ef43aa38
MB		 1518}
1519
d68b2958 1520static int crypt_alloc_req(struct crypt_config *cc,
ef43aa38
MB		 1521 struct convert_context *ctx)
1522{
33d2f09f 1523 if (crypt_integrity_aead(cc))
d68b2958 1524 return crypt_alloc_req_aead(cc, ctx);
ef43aa38 1525 else
d68b2958 1526 return crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1527}
1528
ef43aa38
MB		 1529static void crypt_free_req_skcipher(struct crypt_config *cc,
1530 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1531{
1532 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1533
bbdb23b5 1534 if ((struct skcipher_request *)(io + 1) != req)
6f1c819c 1535 mempool_free(req, &cc->req_pool);
298a9fa0
MP		 1536}
1537
ef43aa38
MB		 1538static void crypt_free_req_aead(struct crypt_config *cc,
1539 struct aead_request *req, struct bio *base_bio)
1540{
1541 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1542
1543 if ((struct aead_request *)(io + 1) != req)
6f1c819c 1544 mempool_free(req, &cc->req_pool);
ef43aa38
MB		 1545}
1546
1547static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1548{
33d2f09f 1549 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1550 crypt_free_req_aead(cc, req, base_bio);
1551 else
1552 crypt_free_req_skcipher(cc, req, base_bio);
1553}
1554
1da177e4
LT		 1555/*
1556 * Encrypt / decrypt data from one bio to another one (can be the same one)
1557 */
4e4cbee9 1558static blk_status_t crypt_convert(struct crypt_config *cc,
8abec36d 1559 struct convert_context *ctx, bool atomic, bool reset_pending)
1da177e4 1560{
ef43aa38 1561 unsigned int tag_offset = 0;
ff3af92b 1562 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1563 int r;
1da177e4 1564
8abec36d
IK		 1565 /*
1566 * if reset_pending is set we are dealing with the bio for the first time,
1567 * else we're continuing to work on the previous bio, so don't mess with
1568 * the cc_pending counter
1569 */
1570 if (reset_pending)
1571 atomic_set(&ctx->cc_pending, 1);
c8081618 1572
003b5c57 1573 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1574
d68b2958
IK		 1575 r = crypt_alloc_req(cc, ctx);
1576 if (r) {
1577 complete(&ctx->restart);
1578 return BLK_STS_DEV_RESOURCE;
1579 }
1580
40b6229b 1581 atomic_inc(&ctx->cc_pending);
3f1e9070 1582
33d2f09f 1583 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1584 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1585 else
1586 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1587
1588 switch (r) {
54cea3f6
MB		 1589 /*
1590 * The request was queued by a crypto driver
1591 * but the driver request queue is full, let's wait.
1592 */
3a7f6c99 1593 case -EBUSY:
8abec36d
IK		 1594 if (in_interrupt()) {
1595 if (try_wait_for_completion(&ctx->restart)) {
1596 /*
1597 * we don't have to block to wait for completion,
1598 * so proceed
1599 */
1600 } else {
1601 /*
1602 * we can't wait for completion without blocking
1603 * exit and continue processing in a workqueue
1604 */
1605 ctx->r.req = NULL;
1606 ctx->cc_sector += sector_step;
1607 tag_offset++;
1608 return BLK_STS_DEV_RESOURCE;
1609 }
1610 } else {
1611 wait_for_completion(&ctx->restart);
1612 }
16735d02 1613 reinit_completion(&ctx->restart);
df561f66 1614 fallthrough;
54cea3f6
MB		 1615 /*
1616 * The request is queued and processed asynchronously,
1617 * completion function kcryptd_async_done() will be called.
1618 */
c0403ec0 1619 case -EINPROGRESS:
ef43aa38 1620 ctx->r.req = NULL;
8f0009a2 1621 ctx->cc_sector += sector_step;
583fe747 1622 tag_offset++;
3f1e9070 1623 continue;
54cea3f6
MB		 1624 /*
1625 * The request was already processed (synchronously).
1626 */
3a7f6c99 1627 case 0:
40b6229b 1628 atomic_dec(&ctx->cc_pending);
8f0009a2 1629 ctx->cc_sector += sector_step;
583fe747 1630 tag_offset++;
39d42fa9
IK		 1631 if (!atomic)
1632 cond_resched();
3a7f6c99 1633 continue;
ef43aa38
MB		 1634 /*
1635 * There was a data integrity error.
1636 */
1637 case -EBADMSG:
1638 atomic_dec(&ctx->cc_pending);
4e4cbee9 1639 return BLK_STS_PROTECTION;
ef43aa38
MB		 1640 /*
1641 * There was an error while processing the request.
1642 */
3f1e9070 1643 default:
40b6229b 1644 atomic_dec(&ctx->cc_pending);
4e4cbee9 1645 return BLK_STS_IOERR;
3f1e9070 1646 }
1da177e4
LT		 1647 }
1648
3f1e9070 1649 return 0;
1da177e4
LT		 1650}
1651
cf2f1abf
MP		 1652static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1653
1da177e4
LT		 1654/*
1655 * Generate a new unfragmented bio with the given size
586b286b
MS		 1656 * This should never violate the device limitations (but only because
1657 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1658 *
1659 * This function may be called concurrently. If we allocate from the mempool
1660 * concurrently, there is a possibility of deadlock. For example, if we have
1661 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1662 * the mempool concurrently, it may deadlock in a situation where both processes
1663 * have allocated 128 pages and the mempool is exhausted.
1664 *
1665 * In order to avoid this scenario we allocate the pages under a mutex.
1666 *
1667 * In order to not degrade performance with excessive locking, we try
1668 * non-blocking allocations without a mutex first but on failure we fallback
1669 * to blocking allocations with a mutex.
5054e778
MP		 1670 *
1671 * In order to reduce allocation overhead, we try to allocate compound pages in
1672 * the first pass. If they are not available, we fall back to the mempool.
1da177e4 1673 */
86a3238c 1674static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size)
1da177e4 1675{
49a8a920 1676 struct crypt_config *cc = io->cc;
8b004457 1677 struct bio *clone;
1da177e4 1678 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241 1679 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
5054e778 1680 unsigned int remaining_size;
5e0a760b 1681 unsigned int order = MAX_PAGE_ORDER;
1da177e4 1682
7145c241 1683retry:
d0164adc 1684 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1685 mutex_lock(&cc->bio_alloc_lock);
1686
609be106
CH		 1687 clone = bio_alloc_bioset(cc->dev->bdev, nr_iovecs, io->base_bio->bi_opf,
1688 GFP_NOIO, &cc->bs);
3f868c09
CH		 1689 clone->bi_private = io;
1690 clone->bi_end_io = crypt_endio;
5d8d4081 1691 clone->bi_ioprio = io->base_bio->bi_ioprio;
6a24c718 1692
7145c241
MP		 1693 remaining_size = size;
1694
5054e778
MP		 1695 while (remaining_size) {
1696 struct page *pages;
1697 unsigned size_to_add;
1698 unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1699 order = min(order, remaining_order);
1700
1701 while (order > 0) {
9793c269
MP		 1702 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) +
1703 (1 << order) > dm_crypt_pages_per_client))
1704 goto decrease_order;
5054e778
MP		 1705 pages = alloc_pages(gfp_mask
1706 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP,
1707 order);
9793c269
MP		 1708 if (likely(pages != NULL)) {
1709 percpu_counter_add(&cc->n_allocated_pages, 1 << order);
5054e778 1710 goto have_pages;
9793c269
MP		 1711 }
1712decrease_order:
5054e778
MP		 1713 order--;
1714 }
1715
1716 pages = mempool_alloc(&cc->page_pool, gfp_mask);
1717 if (!pages) {
7145c241
MP		 1718 crypt_free_buffer_pages(cc, clone);
1719 bio_put(clone);
d0164adc 1720 gfp_mask |= __GFP_DIRECT_RECLAIM;
5054e778 1721 order = 0;
7145c241
MP		 1722 goto retry;
1723 }
1da177e4 1724
5054e778
MP		 1725have_pages:
1726 size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size);
1727 __bio_add_page(clone, pages, size_to_add, 0);
1728 remaining_size -= size_to_add;
1da177e4
LT		 1729 }
1730
ef43aa38
MB		 1731 /* Allocate space for integrity tags */
1732 if (dm_crypt_integrity_io_alloc(io, clone)) {
1733 crypt_free_buffer_pages(cc, clone);
1734 bio_put(clone);
1735 clone = NULL;
1736 }
53db984e 1737
d0164adc 1738 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1739 mutex_unlock(&cc->bio_alloc_lock);
1740
8b004457 1741 return clone;
1da177e4
LT		 1742}
1743
644bd2f0 1744static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1745{
5054e778 1746 struct folio_iter fi;
1da177e4 1747
5054e778
MP		 1748 if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */
1749 bio_for_each_folio_all(fi, clone) {
9793c269
MP		 1750 if (folio_test_large(fi.folio)) {
1751 percpu_counter_sub(&cc->n_allocated_pages,
1752 1 << folio_order(fi.folio));
5054e778 1753 folio_put(fi.folio);
9793c269 1754 } else {
5054e778 1755 mempool_free(&fi.folio->page, &cc->page_pool);
9793c269 1756 }
5054e778 1757 }
1da177e4
LT		 1758 }
1759}
1760
298a9fa0
MP		 1761static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1762 struct bio *bio, sector_t sector)
dc440d1e 1763{
49a8a920 1764 io->cc = cc;
dc440d1e
MB		 1765 io->base_bio = bio;
1766 io->sector = sector;
1767 io->error = 0;
42e15d12
MP		 1768 io->ctx.aead_recheck = false;
1769 io->ctx.aead_failed = false;
ef43aa38
MB		 1770 io->ctx.r.req = NULL;
1771 io->integrity_metadata = NULL;
1772 io->integrity_metadata_from_pool = false;
40b6229b 1773 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1774}
1775
3e1a8bdd
MB		 1776static void crypt_inc_pending(struct dm_crypt_io *io)
1777{
40b6229b 1778 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1779}
1780
42e15d12
MP		 1781static void kcryptd_queue_read(struct dm_crypt_io *io);
1782
1da177e4
LT		 1783/*
1784 * One of the bios was finished. Check for completion of
1785 * the whole request and correctly clean up the buffer.
1786 */
5742fd77 1787static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1788{
49a8a920 1789 struct crypt_config *cc = io->cc;
b35f8caa 1790 struct bio *base_bio = io->base_bio;
4e4cbee9 1791 blk_status_t error = io->error;
1da177e4 1792
40b6229b 1793 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1794 return;
1795
42e15d12
MP		 1796 if (likely(!io->ctx.aead_recheck) && unlikely(io->ctx.aead_failed) &&
1797 cc->on_disk_tag_size && bio_data_dir(base_bio) == READ) {
1798 io->ctx.aead_recheck = true;
1799 io->ctx.aead_failed = false;
1800 io->error = 0;
1801 kcryptd_queue_read(io);
1802 return;
1803 }
1804
ef43aa38
MB		 1805 if (io->ctx.r.req)
1806 crypt_free_req(cc, io->ctx.r.req, base_bio);
1807
1808 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1809 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1810 else
1811 kfree(io->integrity_metadata);
b35f8caa 1812
4e4cbee9 1813 base_bio->bi_status = error;
8e14f610 1814
d9a02e01 1815 bio_endio(base_bio);
1da177e4
LT		 1816}
1817
1818/*
cabf08e4 1819 * kcryptd/kcryptd_io:
1da177e4
LT		 1820 *
1821 * Needed because it would be very unwise to do decryption in an
23541d2d 1822 * interrupt context.
cabf08e4
MB		 1823 *
1824 * kcryptd performs the actual encryption or decryption.
1825 *
1826 * kcryptd_io performs the IO submission.
1827 *
1828 * They must be separated as otherwise the final stages could be
1829 * starved by new requests which can block in the first stages due
1830 * to memory allocation.
c0297721
AK		 1831 *
1832 * The work is done per CPU global for all dm-crypt instances.
1833 * They should not depend on each other and do not block.
1da177e4 1834 */
4246a0b6 1835static void crypt_endio(struct bio *clone)
8b004457 1836{
028867ac 1837 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1838 struct crypt_config *cc = io->cc;
86a3238c 1839 unsigned int rw = bio_data_dir(clone);
42e15d12
MP		 1840 blk_status_t error = clone->bi_status;
1841
1842 if (io->ctx.aead_recheck && !error) {
1843 kcryptd_queue_crypt(io);
1844 return;
1845 }
8b004457
MB		 1846
1847 /*
6712ecf8 1848 * free the processed pages
8b004457 1849 */
42e15d12 1850 if (rw == WRITE || io->ctx.aead_recheck)
644bd2f0 1851 crypt_free_buffer_pages(cc, clone);
8b004457
MB		 1852
1853 bio_put(clone);
8b004457 1854
9b81c842 1855 if (rw == READ && !error) {
ee7a491e
MB		 1856 kcryptd_queue_crypt(io);
1857 return;
1858 }
5742fd77 1859
9b81c842
SL		 1860 if (unlikely(error))
1861 io->error = error;
5742fd77
MB		 1862
1863 crypt_dec_pending(io);
8b004457
MB		 1864}
1865
e5524e12
MS		 1866#define CRYPT_MAP_READ_GFP GFP_NOWAIT
1867
20c82538 1868static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1869{
49a8a920 1870 struct crypt_config *cc = io->cc;
8b004457 1871 struct bio *clone;
93e605c2 1872
42e15d12
MP		 1873 if (io->ctx.aead_recheck) {
1874 if (!(gfp & __GFP_DIRECT_RECLAIM))
1875 return 1;
1876 crypt_inc_pending(io);
1877 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1878 if (unlikely(!clone)) {
1879 crypt_dec_pending(io);
1880 return 1;
1881 }
1882 clone->bi_iter.bi_sector = cc->start + io->sector;
1883 crypt_convert_init(cc, &io->ctx, clone, clone, io->sector);
1884 io->saved_bi_iter = clone->bi_iter;
1885 dm_submit_bio_remap(io->base_bio, clone);
1886 return 0;
1887 }
1888
8b004457 1889 /*
abfc426d
CH		 1890 * We need the original biovec array in order to decrypt the whole bio
1891 * data *afterwards* -- thanks to immutable biovecs we don't need to
1892 * worry about the block layer modifying the biovec array; so leverage
1893 * bio_alloc_clone().
8b004457 1894 */
abfc426d 1895 clone = bio_alloc_clone(cc->dev->bdev, io->base_bio, gfp, &cc->bs);
7eaceacc 1896 if (!clone)
20c82538 1897 return 1;
3f868c09
CH		 1898 clone->bi_private = io;
1899 clone->bi_end_io = crypt_endio;
8b004457 1900
20c82538
MB		 1901 crypt_inc_pending(io);
1902
4f024f37 1903 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1904
ef43aa38
MB		 1905 if (dm_crypt_integrity_io_alloc(io, clone)) {
1906 crypt_dec_pending(io);
1907 bio_put(clone);
1908 return 1;
1909 }
1910
b7f8dff0 1911 dm_submit_bio_remap(io->base_bio, clone);
20c82538 1912 return 0;
8b004457
MB		 1913}
1914
dc267621
MP		 1915static void kcryptd_io_read_work(struct work_struct *work)
1916{
1917 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1918
1919 crypt_inc_pending(io);
1920 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1921 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1922 crypt_dec_pending(io);
1923}
1924
1925static void kcryptd_queue_read(struct dm_crypt_io *io)
1926{
1927 struct crypt_config *cc = io->cc;
1928
1929 INIT_WORK(&io->work, kcryptd_io_read_work);
1930 queue_work(cc->io_queue, &io->work);
1931}
1932
4e4eef64
MB		 1933static void kcryptd_io_write(struct dm_crypt_io *io)
1934{
95497a96 1935 struct bio *clone = io->ctx.bio_out;
dc267621 1936
b7f8dff0 1937 dm_submit_bio_remap(io->base_bio, clone);
4e4eef64
MB		 1938}
1939
b3c5fd30
MP		 1940#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1941
dc267621 1942static int dmcrypt_write(void *data)
395b167c 1943{
dc267621 1944 struct crypt_config *cc = data;
b3c5fd30
MP		 1945 struct dm_crypt_io *io;
1946
dc267621 1947 while (1) {
b3c5fd30 1948 struct rb_root write_tree;
dc267621 1949 struct blk_plug plug;
395b167c 1950
c7329eff 1951 spin_lock_irq(&cc->write_thread_lock);
dc267621 1952continue_locked:
395b167c 1953
b3c5fd30 1954 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1955 goto pop_from_list;
1956
f659b100 1957 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1958
c7329eff 1959 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1960
f659b100 1961 if (unlikely(kthread_should_stop())) {
642fa448 1962 set_current_state(TASK_RUNNING);
f659b100
RV		 1963 break;
1964 }
1965
dc267621
MP		 1966 schedule();
1967
c7329eff 1968 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1969 goto continue_locked;
1970
1971pop_from_list:
b3c5fd30
MP		 1972 write_tree = cc->write_tree;
1973 cc->write_tree = RB_ROOT;
c7329eff 1974 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1975
b3c5fd30
MP		 1976 BUG_ON(rb_parent(write_tree.rb_node));
1977
1978 /*
1979 * Note: we cannot walk the tree here with rb_next because
1980 * the structures may be freed when kcryptd_io_write is called.
1981 */
dc267621
MP		 1982 blk_start_plug(&plug);
1983 do {
b3c5fd30
MP		 1984 io = crypt_io_from_node(rb_first(&write_tree));
1985 rb_erase(&io->rb_node, &write_tree);
dc267621 1986 kcryptd_io_write(io);
fb294b1c 1987 cond_resched();
b3c5fd30 1988 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1989 blk_finish_plug(&plug);
1990 }
1991 return 0;
395b167c
AK		 1992}
1993
72c6e7af 1994static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1995{
dec1cedf 1996 struct bio *clone = io->ctx.bio_out;
49a8a920 1997 struct crypt_config *cc = io->cc;
dc267621 1998 unsigned long flags;
b3c5fd30
MP		 1999 sector_t sector;
2000 struct rb_node **rbp, *parent;
dec1cedf 2001
4e4cbee9 2002 if (unlikely(io->error)) {
dec1cedf
MB		 2003 crypt_free_buffer_pages(cc, clone);
2004 bio_put(clone);
6c031f41 2005 crypt_dec_pending(io);
dec1cedf
MB		 2006 return;
2007 }
2008
2009 /* crypt_convert should have filled the clone bio */
003b5c57 2010 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 2011
4f024f37 2012 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 2013
39d42fa9
IK		 2014 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) ||
2015 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) {
b7f8dff0 2016 dm_submit_bio_remap(io->base_bio, clone);
0f5d8e6e
MP		 2017 return;
2018 }
2019
c7329eff
MP		 2020 spin_lock_irqsave(&cc->write_thread_lock, flags);
2021 if (RB_EMPTY_ROOT(&cc->write_tree))
2022 wake_up_process(cc->write_thread);
b3c5fd30
MP		 2023 rbp = &cc->write_tree.rb_node;
2024 parent = NULL;
2025 sector = io->sector;
2026 while (*rbp) {
2027 parent = *rbp;
2028 if (sector < crypt_io_from_node(parent)->sector)
2029 rbp = &(*rbp)->rb_left;
2030 else
2031 rbp = &(*rbp)->rb_right;
2032 }
2033 rb_link_node(&io->rb_node, parent, rbp);
2034 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 2035 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 2036}
2037
8e225f04
DLM		 2038static bool kcryptd_crypt_write_inline(struct crypt_config *cc,
2039 struct convert_context *ctx)
2040
2041{
2042 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags))
2043 return false;
2044
2045 /*
2046 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering
2047 * constraints so they do not need to be issued inline by
2048 * kcryptd_crypt_write_convert().
2049 */
2050 switch (bio_op(ctx->bio_in)) {
2051 case REQ_OP_WRITE:
8e225f04
DLM		 2052 case REQ_OP_WRITE_ZEROES:
2053 return true;
2054 default:
2055 return false;
2056 }
2057}
2058
8abec36d
IK		 2059static void kcryptd_crypt_write_continue(struct work_struct *work)
2060{
2061 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
2062 struct crypt_config *cc = io->cc;
2063 struct convert_context *ctx = &io->ctx;
2064 int crypt_finished;
2065 sector_t sector = io->sector;
2066 blk_status_t r;
2067
2068 wait_for_completion(&ctx->restart);
2069 reinit_completion(&ctx->restart);
2070
2071 r = crypt_convert(cc, &io->ctx, true, false);
2072 if (r)
2073 io->error = r;
2074 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2075 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2076 /* Wait for completion signaled by kcryptd_async_done() */
2077 wait_for_completion(&ctx->restart);
2078 crypt_finished = 1;
2079 }
2080
2081 /* Encryption was already finished, submit io now */
2082 if (crypt_finished) {
2083 kcryptd_crypt_write_io_submit(io, 0);
2084 io->sector = sector;
2085 }
2086
2087 crypt_dec_pending(io);
2088}
2089
fc5a5e9a 2090static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 2091{
49a8a920 2092 struct crypt_config *cc = io->cc;
8e225f04 2093 struct convert_context *ctx = &io->ctx;
8b004457 2094 struct bio *clone;
c8081618 2095 int crypt_finished;
b635b00e 2096 sector_t sector = io->sector;
4e4cbee9 2097 blk_status_t r;
8b004457 2098
fc5a5e9a
MB		 2099 /*
2100 * Prevent io from disappearing until this function completes.
2101 */
2102 crypt_inc_pending(io);
8e225f04 2103 crypt_convert_init(cc, ctx, NULL, io->base_bio, sector);
fc5a5e9a 2104
cf2f1abf
MP		 2105 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
2106 if (unlikely(!clone)) {
4e4cbee9 2107 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 2108 goto dec;
2109 }
c8081618 2110
cf2f1abf
MP		 2111 io->ctx.bio_out = clone;
2112 io->ctx.iter_out = clone->bi_iter;
b635b00e 2113
50c70240
MP		 2114 if (crypt_integrity_aead(cc)) {
2115 bio_copy_data(clone, io->base_bio);
2116 io->ctx.bio_in = clone;
2117 io->ctx.iter_in = clone->bi_iter;
2118 }
2119
cf2f1abf 2120 sector += bio_sectors(clone);
93e605c2 2121
cf2f1abf 2122 crypt_inc_pending(io);
8e225f04 2123 r = crypt_convert(cc, ctx,
8abec36d
IK		 2124 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true);
2125 /*
2126 * Crypto API backlogged the request, because its queue was full
2127 * and we're in softirq context, so continue from a workqueue
2128 * (TODO: is it actually possible to be in softirq in the write path?)
2129 */
2130 if (r == BLK_STS_DEV_RESOURCE) {
2131 INIT_WORK(&io->work, kcryptd_crypt_write_continue);
2132 queue_work(cc->crypt_queue, &io->work);
2133 return;
2134 }
4e4cbee9 2135 if (r)
ef43aa38 2136 io->error = r;
8e225f04
DLM		 2137 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2138 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2139 /* Wait for completion signaled by kcryptd_async_done() */
2140 wait_for_completion(&ctx->restart);
2141 crypt_finished = 1;
2142 }
933f01d4 2143
cf2f1abf
MP		 2144 /* Encryption was already finished, submit io now */
2145 if (crypt_finished) {
2146 kcryptd_crypt_write_io_submit(io, 0);
2147 io->sector = sector;
93e605c2 2148 }
899c95d3 2149
cf2f1abf 2150dec:
899c95d3 2151 crypt_dec_pending(io);
84131db6
MB		 2152}
2153
72c6e7af 2154static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 2155{
42e15d12
MP		 2156 if (io->ctx.aead_recheck) {
2157 if (!io->error) {
2158 io->ctx.bio_in->bi_iter = io->saved_bi_iter;
2159 bio_copy_data(io->base_bio, io->ctx.bio_in);
2160 }
2161 crypt_free_buffer_pages(io->cc, io->ctx.bio_in);
2162 bio_put(io->ctx.bio_in);
2163 }
5742fd77
MB		 2164 crypt_dec_pending(io);
2165}
2166
8abec36d
IK		 2167static void kcryptd_crypt_read_continue(struct work_struct *work)
2168{
2169 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
2170 struct crypt_config *cc = io->cc;
2171 blk_status_t r;
2172
2173 wait_for_completion(&io->ctx.restart);
2174 reinit_completion(&io->ctx.restart);
2175
2176 r = crypt_convert(cc, &io->ctx, true, false);
2177 if (r)
2178 io->error = r;
2179
2180 if (atomic_dec_and_test(&io->ctx.cc_pending))
2181 kcryptd_crypt_read_done(io);
2182
2183 crypt_dec_pending(io);
2184}
2185
4e4eef64 2186static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 2187{
49a8a920 2188 struct crypt_config *cc = io->cc;
4e4cbee9 2189 blk_status_t r;
1da177e4 2190
3e1a8bdd 2191 crypt_inc_pending(io);
3a7f6c99 2192
42e15d12
MP		 2193 if (io->ctx.aead_recheck) {
2194 io->ctx.cc_sector = io->sector + cc->iv_offset;
2195 r = crypt_convert(cc, &io->ctx,
2196 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true);
2197 } else {
2198 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
2199 io->sector);
1da177e4 2200
42e15d12
MP		 2201 r = crypt_convert(cc, &io->ctx,
2202 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true);
2203 }
8abec36d
IK		 2204 /*
2205 * Crypto API backlogged the request, because its queue was full
2206 * and we're in softirq context, so continue from a workqueue
2207 */
2208 if (r == BLK_STS_DEV_RESOURCE) {
2209 INIT_WORK(&io->work, kcryptd_crypt_read_continue);
2210 queue_work(cc->crypt_queue, &io->work);
2211 return;
2212 }
4e4cbee9 2213 if (r)
ef43aa38 2214 io->error = r;
5742fd77 2215
40b6229b 2216 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 2217 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 2218
2219 crypt_dec_pending(io);
1da177e4
LT		 2220}
2221
dcfe653d 2222static void kcryptd_async_done(void *data, int error)
95497a96 2223{
dcfe653d 2224 struct dm_crypt_request *dmreq = data;
b2174eeb 2225 struct convert_context *ctx = dmreq->ctx;
95497a96 2226 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 2227 struct crypt_config *cc = io->cc;
95497a96 2228
54cea3f6
MB		 2229 /*
2230 * A request from crypto driver backlog is going to be processed now,
2231 * finish the completion and continue in crypt_convert().
2232 * (Callback will be called for the second time for this request.)
2233 */
c0403ec0
RV		 2234 if (error == -EINPROGRESS) {
2235 complete(&ctx->restart);
95497a96 2236 return;
c0403ec0 2237 }
95497a96 2238
2dc5327d 2239 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 2240 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 2241
ef43aa38 2242 if (error == -EBADMSG) {
58d0f180
MW		 2243 sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq));
2244
42e15d12
MP		 2245 ctx->aead_failed = true;
2246 if (ctx->aead_recheck) {
2247 DMERR_LIMIT("%pg: INTEGRITY AEAD ERROR, sector %llu",
2248 ctx->bio_in->bi_bdev, s);
2249 dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead",
2250 ctx->bio_in, s, 0);
2251 }
4e4cbee9 2252 io->error = BLK_STS_PROTECTION;
ef43aa38 2253 } else if (error < 0)
4e4cbee9 2254 io->error = BLK_STS_IOERR;
72c6e7af 2255
298a9fa0 2256 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 2257
40b6229b 2258 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 2259 return;
95497a96 2260
8e225f04
DLM		 2261 /*
2262 * The request is fully completed: for inline writes, let
2263 * kcryptd_crypt_write_convert() do the IO submission.
2264 */
2265 if (bio_data_dir(io->base_bio) == READ) {
72c6e7af 2266 kcryptd_crypt_read_done(io);
8e225f04
DLM		 2267 return;
2268 }
2269
2270 if (kcryptd_crypt_write_inline(cc, ctx)) {
2271 complete(&ctx->restart);
2272 return;
2273 }
2274
2275 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 2276}
2277
395b167c 2278static void kcryptd_crypt(struct work_struct *work)
1da177e4 2279{
028867ac 2280 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 2281
cabf08e4 2282 if (bio_data_dir(io->base_bio) == READ)
395b167c 2283 kcryptd_crypt_read_convert(io);
4e4eef64 2284 else
395b167c 2285 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 2286}
2287
395b167c 2288static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 2289{
49a8a920 2290 struct crypt_config *cc = io->cc;
cabf08e4 2291
39d42fa9
IK		 2292 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) ||
2293 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) {
c87a95dc 2294 /*
d3703ef3 2295 * in_hardirq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context.
c87a95dc
IK		 2296 * irqs_disabled(): the kernel may run some IO completion from the idle thread, but
2297 * it is being executed with irqs disabled.
2298 */
fb6ad4ae
TH		 2299 if (in_hardirq() || irqs_disabled()) {
2300 INIT_WORK(&io->work, kcryptd_crypt);
2301 queue_work(system_bh_wq, &io->work);
2302 return;
2303 } else {
0a9bab39 2304 kcryptd_crypt(&io->work);
39d42fa9
IK		 2305 return;
2306 }
39d42fa9
IK		 2307 }
2308
395b167c
AK		 2309 INIT_WORK(&io->work, kcryptd_crypt);
2310 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 2311}
2312
ef43aa38 2313static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 2314{
ef43aa38
MB		 2315 if (!cc->cipher_tfm.tfms_aead)
2316 return;
1da177e4 2317
ef43aa38
MB		 2318 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2319 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
2320 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 2321 }
2322
ef43aa38
MB		 2323 kfree(cc->cipher_tfm.tfms_aead);
2324 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 2325}
2326
ef43aa38 2327static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 2328{
86a3238c 2329 unsigned int i;
d1f96423 2330
ef43aa38 2331 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2332 return;
2333
d1f96423 2334 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 2335 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
2336 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
2337 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 2338 }
fd2d231f 2339
ef43aa38
MB		 2340 kfree(cc->cipher_tfm.tfms);
2341 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 2342}
2343
ef43aa38
MB		 2344static void crypt_free_tfms(struct crypt_config *cc)
2345{
33d2f09f 2346 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2347 crypt_free_tfms_aead(cc);
2348 else
2349 crypt_free_tfms_skcipher(cc);
2350}
2351
2352static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 2353{
86a3238c 2354 unsigned int i;
d1f96423
MB		 2355 int err;
2356
6396bb22
KC		 2357 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
2358 sizeof(struct crypto_skcipher *),
2359 GFP_KERNEL);
ef43aa38 2360 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2361 return -ENOMEM;
2362
d1f96423 2363 for (i = 0; i < cc->tfms_count; i++) {
cd746938
MP		 2364 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0,
2365 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2366 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
2367 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 2368 crypt_free_tfms(cc);
d1f96423
MB		 2369 return err;
2370 }
2371 }
2372
af331eba
EB		 2373 /*
2374 * dm-crypt performance can vary greatly depending on which crypto
2375 * algorithm implementation is used. Help people debug performance
2376 * problems by logging the ->cra_driver_name.
2377 */
7a1cd723 2378 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2379 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 2380 return 0;
2381}
2382
ef43aa38
MB		 2383static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
2384{
ef43aa38
MB		 2385 int err;
2386
2387 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
2388 if (!cc->cipher_tfm.tfms)
2389 return -ENOMEM;
2390
cd746938
MP		 2391 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0,
2392 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2393 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2394 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
2395 crypt_free_tfms(cc);
2396 return err;
2397 }
2398
7a1cd723 2399 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2400 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 2401 return 0;
2402}
2403
2404static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
2405{
33d2f09f 2406 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2407 return crypt_alloc_tfms_aead(cc, ciphermode);
2408 else
2409 return crypt_alloc_tfms_skcipher(cc, ciphermode);
2410}
2411
86a3238c 2412static unsigned int crypt_subkey_size(struct crypt_config *cc)
ef43aa38
MB		 2413{
2414 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
2415}
2416
86a3238c 2417static unsigned int crypt_authenckey_size(struct crypt_config *cc)
ef43aa38
MB		 2418{
2419 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
2420}
2421
2422/*
2423 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
2424 * the key must be for some reason in special format.
2425 * This funcion converts cc->key to this special format.
2426 */
2427static void crypt_copy_authenckey(char *p, const void *key,
86a3238c 2428 unsigned int enckeylen, unsigned int authkeylen)
ef43aa38
MB		 2429{
2430 struct crypto_authenc_key_param *param;
2431 struct rtattr *rta;
2432
2433 rta = (struct rtattr *)p;
2434 param = RTA_DATA(rta);
2435 param->enckeylen = cpu_to_be32(enckeylen);
2436 rta->rta_len = RTA_LENGTH(sizeof(*param));
2437 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
2438 p += RTA_SPACE(sizeof(*param));
2439 memcpy(p, key + enckeylen, authkeylen);
2440 p += authkeylen;
2441 memcpy(p, key, enckeylen);
2442}
2443
671ea6b4 2444static int crypt_setkey(struct crypt_config *cc)
c0297721 2445{
86a3238c 2446 unsigned int subkey_size;
fd2d231f
MP		 2447 int err = 0, i, r;
2448
da31a078 2449 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 2450 subkey_size = crypt_subkey_size(cc);
da31a078 2451
27c70036
MB		 2452 if (crypt_integrity_hmac(cc)) {
2453 if (subkey_size < cc->key_mac_size)
2454 return -EINVAL;
2455
ef43aa38
MB		 2456 crypt_copy_authenckey(cc->authenc_key, cc->key,
2457 subkey_size - cc->key_mac_size,
2458 cc->key_mac_size);
27c70036
MB		 2459 }
2460
fd2d231f 2461 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 2462 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 2463 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2464 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 2465 else if (crypt_integrity_aead(cc))
2466 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2467 cc->key + (i * subkey_size),
2468 subkey_size);
ef43aa38
MB		 2469 else
2470 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
2471 cc->key + (i * subkey_size),
2472 subkey_size);
fd2d231f
MP		 2473 if (r)
2474 err = r;
c0297721
AK		 2475 }
2476
ef43aa38
MB		 2477 if (crypt_integrity_hmac(cc))
2478 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
2479
c0297721
AK		 2480 return err;
2481}
2482
c538f6ec
OK		 2483#ifdef CONFIG_KEYS
2484
027c431c
OK		 2485static bool contains_whitespace(const char *str)
2486{
2487 while (*str)
2488 if (isspace(*str++))
2489 return true;
2490 return false;
2491}
2492
27f5411a
DB		 2493static int set_key_user(struct crypt_config *cc, struct key *key)
2494{
2495 const struct user_key_payload *ukp;
2496
2497 ukp = user_key_payload_locked(key);
2498 if (!ukp)
2499 return -EKEYREVOKED;
2500
2501 if (cc->key_size != ukp->datalen)
2502 return -EINVAL;
2503
2504 memcpy(cc->key, ukp->data, cc->key_size);
2505
2506 return 0;
2507}
2508
27f5411a
DB		 2509static int set_key_encrypted(struct crypt_config *cc, struct key *key)
2510{
2511 const struct encrypted_key_payload *ekp;
2512
2513 ekp = key->payload.data[0];
2514 if (!ekp)
2515 return -EKEYREVOKED;
2516
2517 if (cc->key_size != ekp->decrypted_datalen)
2518 return -EINVAL;
2519
2520 memcpy(cc->key, ekp->decrypted_data, cc->key_size);
2521
2522 return 0;
2523}
27f5411a 2524
363880c4
AF		 2525static int set_key_trusted(struct crypt_config *cc, struct key *key)
2526{
2527 const struct trusted_key_payload *tkp;
2528
2529 tkp = key->payload.data[0];
2530 if (!tkp)
2531 return -EKEYREVOKED;
2532
2533 if (cc->key_size != tkp->key_len)
2534 return -EINVAL;
2535
2536 memcpy(cc->key, tkp->key, cc->key_size);
2537
2538 return 0;
2539}
2540
c538f6ec
OK		 2541static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2542{
2543 char *new_key_string, *key_desc;
2544 int ret;
27f5411a 2545 struct key_type *type;
c538f6ec 2546 struct key *key;
27f5411a 2547 int (*set_key)(struct crypt_config *cc, struct key *key);
c538f6ec 2548
027c431c
OK		 2549 /*
2550 * Reject key_string with whitespace. dm core currently lacks code for
2551 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2552 */
2553 if (contains_whitespace(key_string)) {
2554 DMERR("whitespace chars not allowed in key string");
2555 return -EINVAL;
2556 }
2557
c538f6ec 2558 /* look for next ':' separating key_type from key_description */
fc772580 2559 key_desc = strchr(key_string, ':');
c538f6ec
OK		 2560 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2561 return -EINVAL;
2562
27f5411a
DB		 2563 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
2564 type = &key_type_logon;
2565 set_key = set_key_user;
2566 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
2567 type = &key_type_user;
2568 set_key = set_key_user;
831475cc
AF		 2569 } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) &&
2570 !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
27f5411a
DB		 2571 type = &key_type_encrypted;
2572 set_key = set_key_encrypted;
363880c4 2573 } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) &&
255e2646 2574 !strncmp(key_string, "trusted:", key_desc - key_string + 1)) {
363880c4
AF		 2575 type = &key_type_trusted;
2576 set_key = set_key_trusted;
27f5411a 2577 } else {
c538f6ec 2578 return -EINVAL;
27f5411a 2579 }
c538f6ec
OK		 2580
2581 new_key_string = kstrdup(key_string, GFP_KERNEL);
2582 if (!new_key_string)
2583 return -ENOMEM;
2584
27f5411a 2585 key = request_key(type, key_desc + 1, NULL);
c538f6ec 2586 if (IS_ERR(key)) {
453431a5 2587 kfree_sensitive(new_key_string);
c538f6ec
OK		 2588 return PTR_ERR(key);
2589 }
2590
f5b0cba8 2591 down_read(&key->sem);
c538f6ec 2592
27f5411a
DB		 2593 ret = set_key(cc, key);
2594 if (ret < 0) {
f5b0cba8 2595 up_read(&key->sem);
c538f6ec 2596 key_put(key);
453431a5 2597 kfree_sensitive(new_key_string);
27f5411a 2598 return ret;
c538f6ec
OK		 2599 }
2600
f5b0cba8 2601 up_read(&key->sem);
c538f6ec
OK		 2602 key_put(key);
2603
2604 /* clear the flag since following operations may invalidate previously valid key */
2605 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2606
2607 ret = crypt_setkey(cc);
2608
c538f6ec
OK		 2609 if (!ret) {
2610 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
453431a5 2611 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2612 cc->key_string = new_key_string;
2613 } else
453431a5 2614 kfree_sensitive(new_key_string);
c538f6ec
OK		 2615
2616 return ret;
2617}
2618
2619static int get_key_size(char **key_string)
2620{
2621 char *colon, dummy;
2622 int ret;
2623
2624 if (*key_string[0] != ':')
2625 return strlen(*key_string) >> 1;
2626
2627 /* look for next ':' in key string */
2628 colon = strpbrk(*key_string + 1, ":");
2629 if (!colon)
2630 return -EINVAL;
2631
2632 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2633 return -EINVAL;
2634
2635 *key_string = colon;
2636
2637 /* remaining key string should be :<logon|user>:<key_desc> */
2638
2639 return ret;
2640}
2641
2642#else
2643
2644static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2645{
2646 return -EINVAL;
2647}
2648
2649static int get_key_size(char **key_string)
2650{
6fc51504 2651 return (*key_string[0] == ':') ? -EINVAL : (int)(strlen(*key_string) >> 1);
c538f6ec
OK		 2652}
2653
27f5411a 2654#endif /* CONFIG_KEYS */
c538f6ec 2655
e48d4bbf
MB		 2656static int crypt_set_key(struct crypt_config *cc, char *key)
2657{
de8be5ac
MB		 2658 int r = -EINVAL;
2659 int key_string_len = strlen(key);
2660
69a8cfcd
MB		 2661 /* Hyphen (which gives a key_size of zero) means there is no key. */
2662 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2663 goto out;
e48d4bbf 2664
c538f6ec
OK		 2665 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2666 if (key[0] == ':') {
2667 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2668 goto out;
c538f6ec 2669 }
e48d4bbf 2670
265e9098
OK		 2671 /* clear the flag since following operations may invalidate previously valid key */
2672 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2673
c538f6ec 2674 /* wipe references to any kernel keyring key */
453431a5 2675 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2676 cc->key_string = NULL;
2677
e944e03e
AS		 2678 /* Decode key from its hex representation. */
2679 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2680 goto out;
e48d4bbf 2681
671ea6b4 2682 r = crypt_setkey(cc);
265e9098
OK		 2683 if (!r)
2684 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2685
2686out:
2687 /* Hex key string not needed after here, so wipe it. */
2688 memset(key, '0', key_string_len);
2689
2690 return r;
e48d4bbf
MB		 2691}
2692
2693static int crypt_wipe_key(struct crypt_config *cc)
2694{
c82feeec
OK		 2695 int r;
2696
e48d4bbf 2697 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2698 get_random_bytes(&cc->key, cc->key_size);
4a52ffc7
MB		 2699
2700 /* Wipe IV private keys */
2701 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2702 r = cc->iv_gen_ops->wipe(cc);
2703 if (r)
2704 return r;
2705 }
2706
453431a5 2707 kfree_sensitive(cc->key_string);
c538f6ec 2708 cc->key_string = NULL;
c82feeec
OK		 2709 r = crypt_setkey(cc);
2710 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2711
c82feeec 2712 return r;
e48d4bbf
MB		 2713}
2714
5059353d
MP		 2715static void crypt_calculate_pages_per_client(void)
2716{
ca79b0c2 2717 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2718
2719 if (!dm_crypt_clients_n)
2720 return;
2721
2722 pages /= dm_crypt_clients_n;
2723 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2724 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2725 dm_crypt_pages_per_client = pages;
2726}
2727
2728static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2729{
2730 struct crypt_config *cc = pool_data;
2731 struct page *page;
2732
528b16bf
AW		 2733 /*
2734 * Note, percpu_counter_read_positive() may over (and under) estimate
2735 * the current usage by at most (batch - 1) * num_online_cpus() pages,
2736 * but avoids potential spinlock contention of an exact result.
2737 */
2738 if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) >= dm_crypt_pages_per_client) &&
5059353d
MP		 2739 likely(gfp_mask & __GFP_NORETRY))
2740 return NULL;
2741
2742 page = alloc_page(gfp_mask);
2743 if (likely(page != NULL))
2744 percpu_counter_add(&cc->n_allocated_pages, 1);
2745
2746 return page;
2747}
2748
2749static void crypt_page_free(void *page, void *pool_data)
2750{
2751 struct crypt_config *cc = pool_data;
2752
2753 __free_page(page);
2754 percpu_counter_sub(&cc->n_allocated_pages, 1);
2755}
2756
28513fcc
MB		 2757static void crypt_dtr(struct dm_target *ti)
2758{
2759 struct crypt_config *cc = ti->private;
2760
2761 ti->private = NULL;
2762
2763 if (!cc)
2764 return;
2765
f659b100 2766 if (cc->write_thread)
dc267621
MP		 2767 kthread_stop(cc->write_thread);
2768
28513fcc
MB		 2769 if (cc->io_queue)
2770 destroy_workqueue(cc->io_queue);
2771 if (cc->crypt_queue)
2772 destroy_workqueue(cc->crypt_queue);
2773
fd2d231f
MP		 2774 crypt_free_tfms(cc);
2775
6f1c819c 2776 bioset_exit(&cc->bs);
28513fcc 2777
6f1c819c
KO		 2778 mempool_exit(&cc->page_pool);
2779 mempool_exit(&cc->req_pool);
2780 mempool_exit(&cc->tag_pool);
2781
d00a11df
KO		 2782 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2783 percpu_counter_destroy(&cc->n_allocated_pages);
2784
28513fcc
MB		 2785 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2786 cc->iv_gen_ops->dtr(cc);
2787
28513fcc
MB		 2788 if (cc->dev)
2789 dm_put_device(ti, cc->dev);
2790
453431a5
WL		 2791 kfree_sensitive(cc->cipher_string);
2792 kfree_sensitive(cc->key_string);
2793 kfree_sensitive(cc->cipher_auth);
2794 kfree_sensitive(cc->authenc_key);
28513fcc 2795
d5ffebdd
MS		 2796 mutex_destroy(&cc->bio_alloc_lock);
2797
28513fcc 2798 /* Must zero key material before freeing */
453431a5 2799 kfree_sensitive(cc);
5059353d
MP		 2800
2801 spin_lock(&dm_crypt_clients_lock);
2802 WARN_ON(!dm_crypt_clients_n);
2803 dm_crypt_clients_n--;
2804 crypt_calculate_pages_per_client();
2805 spin_unlock(&dm_crypt_clients_lock);
58d0f180
MW		 2806
2807 dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1);
28513fcc
MB		 2808}
2809
e889f97a
MB		 2810static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2811{
2812 struct crypt_config *cc = ti->private;
2813
33d2f09f 2814 if (crypt_integrity_aead(cc))
e889f97a
MB		 2815 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2816 else
2817 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2818
e889f97a
MB		 2819 if (cc->iv_size)
2820 /* at least a 64 bit sector number should fit in our buffer */
2821 cc->iv_size = max(cc->iv_size,
2822 (unsigned int)(sizeof(u64) / sizeof(u8)));
2823 else if (ivmode) {
2824 DMWARN("Selected cipher does not support IVs");
2825 ivmode = NULL;
2826 }
2827
2828 /* Choose ivmode, see comments at iv code. */
2829 if (ivmode == NULL)
2830 cc->iv_gen_ops = NULL;
2831 else if (strcmp(ivmode, "plain") == 0)
2832 cc->iv_gen_ops = &crypt_iv_plain_ops;
2833 else if (strcmp(ivmode, "plain64") == 0)
2834 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2835 else if (strcmp(ivmode, "plain64be") == 0)
2836 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2837 else if (strcmp(ivmode, "essiv") == 0)
2838 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2839 else if (strcmp(ivmode, "benbi") == 0)
2840 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2841 else if (strcmp(ivmode, "null") == 0)
2842 cc->iv_gen_ops = &crypt_iv_null_ops;
b9411d73
MB		 2843 else if (strcmp(ivmode, "eboiv") == 0)
2844 cc->iv_gen_ops = &crypt_iv_eboiv_ops;
bbb16584
MB		 2845 else if (strcmp(ivmode, "elephant") == 0) {
2846 cc->iv_gen_ops = &crypt_iv_elephant_ops;
2847 cc->key_parts = 2;
2848 cc->key_extra_size = cc->key_size / 2;
2849 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE)
2850 return -EINVAL;
2851 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags);
2852 } else if (strcmp(ivmode, "lmk") == 0) {
e889f97a
MB		 2853 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2854 /*
2855 * Version 2 and 3 is recognised according
2856 * to length of provided multi-key string.
2857 * If present (version 3), last key is used as IV seed.
2858 * All keys (including IV seed) are always the same size.
2859 */
2860 if (cc->key_size % cc->key_parts) {
2861 cc->key_parts++;
2862 cc->key_extra_size = cc->key_size / cc->key_parts;
2863 }
2864 } else if (strcmp(ivmode, "tcw") == 0) {
2865 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2866 cc->key_parts += 2; /* IV + whitening */
2867 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2868 } else if (strcmp(ivmode, "random") == 0) {
2869 cc->iv_gen_ops = &crypt_iv_random_ops;
2870 /* Need storage space in integrity fields. */
2871 cc->integrity_iv_size = cc->iv_size;
2872 } else {
2873 ti->error = "Invalid IV mode";
2874 return -EINVAL;
2875 }
2876
2877 return 0;
2878}
2879
33d2f09f
MB		 2880/*
2881 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2882 * The HMAC is needed to calculate tag size (HMAC digest size).
2883 * This should be probably done by crypto-api calls (once available...)
2884 */
2885static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2886{
2887 char *start, *end, *mac_alg = NULL;
2888 struct crypto_ahash *mac;
2889
2890 if (!strstarts(cipher_api, "authenc("))
2891 return 0;
2892
2893 start = strchr(cipher_api, '(');
2894 end = strchr(cipher_api, ',');
2895 if (!start || !end || ++start > end)
2896 return -EINVAL;
2897
e9d7bd2c 2898 mac_alg = kmemdup_nul(start, end - start, GFP_KERNEL);
33d2f09f
MB		 2899 if (!mac_alg)
2900 return -ENOMEM;
33d2f09f 2901
cd746938 2902 mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
33d2f09f
MB		 2903 kfree(mac_alg);
2904
2905 if (IS_ERR(mac))
2906 return PTR_ERR(mac);
2907
2908 cc->key_mac_size = crypto_ahash_digestsize(mac);
2909 crypto_free_ahash(mac);
2910
2911 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2912 if (!cc->authenc_key)
2913 return -ENOMEM;
2914
2915 return 0;
2916}
2917
2918static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2919 char **ivmode, char **ivopts)
2920{
2921 struct crypt_config *cc = ti->private;
a1a262b6 2922 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME];
33d2f09f
MB		 2923 int ret = -EINVAL;
2924
2925 cc->tfms_count = 1;
2926
2927 /*
2928 * New format (capi: prefix)
2929 * capi:cipher_api_spec-iv:ivopts
2930 */
2931 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2932
2933 /* Separate IV options if present, it can contain another '-' in hash name */
2934 *ivopts = strrchr(tmp, ':');
2935 if (*ivopts) {
2936 **ivopts = '\0';
2937 (*ivopts)++;
2938 }
2939 /* Parse IV mode */
2940 *ivmode = strrchr(tmp, '-');
2941 if (*ivmode) {
2942 **ivmode = '\0';
2943 (*ivmode)++;
2944 }
2945 /* The rest is crypto API spec */
2946 cipher_api = tmp;
33d2f09f 2947
a1a262b6
AB		 2948 /* Alloc AEAD, can be used only in new format. */
2949 if (crypt_integrity_aead(cc)) {
2950 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2951 if (ret < 0) {
2952 ti->error = "Invalid AEAD cipher spec";
2a32897c 2953 return ret;
a1a262b6
AB		 2954 }
2955 }
2956
33d2f09f
MB		 2957 if (*ivmode && !strcmp(*ivmode, "lmk"))
2958 cc->tfms_count = 64;
2959
a1a262b6
AB		 2960 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2961 if (!*ivopts) {
2962 ti->error = "Digest algorithm missing for ESSIV mode";
2963 return -EINVAL;
2964 }
2965 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)",
2966 cipher_api, *ivopts);
2967 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
2968 ti->error = "Cannot allocate cipher string";
2969 return -ENOMEM;
2970 }
2971 cipher_api = buf;
2972 }
2973
33d2f09f
MB		 2974 cc->key_parts = cc->tfms_count;
2975
2976 /* Allocate cipher */
2977 ret = crypt_alloc_tfms(cc, cipher_api);
2978 if (ret < 0) {
2979 ti->error = "Error allocating crypto tfm";
2980 return ret;
2981 }
2982
a1a262b6 2983 if (crypt_integrity_aead(cc))
33d2f09f 2984 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
a1a262b6 2985 else
33d2f09f
MB		 2986 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2987
33d2f09f
MB		 2988 return 0;
2989}
2990
2991static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2992 char **ivmode, char **ivopts)
1da177e4 2993{
5ebaee6d 2994 struct crypt_config *cc = ti->private;
33d2f09f 2995 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2996 char *cipher_api = NULL;
fd2d231f 2997 int ret = -EINVAL;
31998ef1 2998 char dummy;
1da177e4 2999
33d2f09f 3000 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 3001 ti->error = "Bad cipher specification";
1da177e4
LT		 3002 return -EINVAL;
3003 }
3004
5ebaee6d
MB		 3005 /*
3006 * Legacy dm-crypt cipher specification
d1f96423 3007 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 3008 */
3009 tmp = cipher_in;
d1f96423
MB		 3010 keycount = strsep(&tmp, "-");
3011 cipher = strsep(&keycount, ":");
3012
3013 if (!keycount)
3014 cc->tfms_count = 1;
31998ef1 3015 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 3016 !is_power_of_2(cc->tfms_count)) {
3017 ti->error = "Bad cipher key count specification";
3018 return -EINVAL;
3019 }
3020 cc->key_parts = cc->tfms_count;
5ebaee6d 3021
1da177e4 3022 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 3023 *ivmode = strsep(&tmp, ":");
3024 *ivopts = tmp;
1da177e4 3025
7dbcd137
MB		 3026 /*
3027 * For compatibility with the original dm-crypt mapping format, if
3028 * only the cipher name is supplied, use cbc-plain.
3029 */
33d2f09f 3030 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 3031 chainmode = "cbc";
33d2f09f 3032 *ivmode = "plain";
1da177e4
LT		 3033 }
3034
33d2f09f 3035 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 3036 ti->error = "IV mechanism required";
3037 return -EINVAL;
1da177e4
LT		 3038 }
3039
5ebaee6d
MB		 3040 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
3041 if (!cipher_api)
3042 goto bad_mem;
3043
a1a262b6
AB		 3044 if (*ivmode && !strcmp(*ivmode, "essiv")) {
3045 if (!*ivopts) {
3046 ti->error = "Digest algorithm missing for ESSIV mode";
3047 kfree(cipher_api);
3048 return -EINVAL;
3049 }
3050 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
3051 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts);
3052 } else {
3053 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
3054 "%s(%s)", chainmode, cipher);
3055 }
3056 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
5ebaee6d
MB		 3057 kfree(cipher_api);
3058 goto bad_mem;
1da177e4
LT		 3059 }
3060
5ebaee6d 3061 /* Allocate cipher */
fd2d231f
MP		 3062 ret = crypt_alloc_tfms(cc, cipher_api);
3063 if (ret < 0) {
3064 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 3065 kfree(cipher_api);
3066 return ret;
1da177e4 3067 }
bd86e320 3068 kfree(cipher_api);
1da177e4 3069
33d2f09f
MB		 3070 return 0;
3071bad_mem:
3072 ti->error = "Cannot allocate cipher strings";
3073 return -ENOMEM;
3074}
5ebaee6d 3075
33d2f09f
MB		 3076static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
3077{
3078 struct crypt_config *cc = ti->private;
3079 char *ivmode = NULL, *ivopts = NULL;
3080 int ret;
3081
3082 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
3083 if (!cc->cipher_string) {
3084 ti->error = "Cannot allocate cipher strings";
3085 return -ENOMEM;
1da177e4
LT		 3086 }
3087
33d2f09f
MB		 3088 if (strstarts(cipher_in, "capi:"))
3089 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
3090 else
3091 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
3092 if (ret)
3093 return ret;
3094
5ebaee6d 3095 /* Initialize IV */
e889f97a
MB		 3096 ret = crypt_ctr_ivmode(ti, ivmode);
3097 if (ret < 0)
33d2f09f 3098 return ret;
1da177e4 3099
da31a078
MB		 3100 /* Initialize and set key */
3101 ret = crypt_set_key(cc, key);
3102 if (ret < 0) {
3103 ti->error = "Error decoding and setting key";
33d2f09f 3104 return ret;
da31a078
MB		 3105 }
3106
28513fcc
MB		 3107 /* Allocate IV */
3108 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
3109 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
3110 if (ret < 0) {
3111 ti->error = "Error creating IV";
33d2f09f 3112 return ret;
28513fcc
MB		 3113 }
3114 }
1da177e4 3115
28513fcc
MB		 3116 /* Initialize IV (set keys for ESSIV etc) */
3117 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
3118 ret = cc->iv_gen_ops->init(cc);
3119 if (ret < 0) {
3120 ti->error = "Error initialising IV";
33d2f09f 3121 return ret;
28513fcc 3122 }
b95bf2d3
MB		 3123 }
3124
dc94902b
OK		 3125 /* wipe the kernel key payload copy */
3126 if (cc->key_string)
3127 memset(cc->key, 0, cc->key_size * sizeof(u8));
3128
5ebaee6d 3129 return ret;
5ebaee6d 3130}
5ebaee6d 3131
ef43aa38
MB		 3132static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
3133{
3134 struct crypt_config *cc = ti->private;
3135 struct dm_arg_set as;
5916a22b 3136 static const struct dm_arg _args[] = {
39d42fa9 3137 {0, 8, "Invalid number of feature args"},
ef43aa38
MB		 3138 };
3139 unsigned int opt_params, val;
3140 const char *opt_string, *sval;
8f0009a2 3141 char dummy;
ef43aa38
MB		 3142 int ret;
3143
3144 /* Optional parameters */
3145 as.argc = argc;
3146 as.argv = argv;
3147
3148 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
3149 if (ret)
3150 return ret;
3151
3152 while (opt_params--) {
3153 opt_string = dm_shift_arg(&as);
3154 if (!opt_string) {
3155 ti->error = "Not enough feature arguments";
3156 return -EINVAL;
3157 }
3158
3159 if (!strcasecmp(opt_string, "allow_discards"))
3160 ti->num_discard_bios = 1;
3161
3162 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
3163 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
3164
3165 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
3166 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3167 else if (!strcasecmp(opt_string, "no_read_workqueue"))
3168 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3169 else if (!strcasecmp(opt_string, "no_write_workqueue"))
3170 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ef43aa38
MB		 3171 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
3172 if (val == 0 || val > MAX_TAG_SIZE) {
3173 ti->error = "Invalid integrity arguments";
3174 return -EINVAL;
3175 }
3176 cc->on_disk_tag_size = val;
3177 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
3178 if (!strcasecmp(sval, "aead")) {
3179 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
42e15d12 3180 } else if (strcasecmp(sval, "none")) {
ef43aa38
MB		 3181 ti->error = "Unknown integrity profile";
3182 return -EINVAL;
3183 }
3184
3185 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
3186 if (!cc->cipher_auth)
3187 return -ENOMEM;
ff3af92b 3188 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 3189 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
3190 cc->sector_size > 4096 ||
ff3af92b 3191 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 3192 ti->error = "Invalid feature value for sector_size";
3193 return -EINVAL;
3194 }
783874b0
MB		 3195 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
3196 ti->error = "Device size is not multiple of sector_size feature";
3197 return -EINVAL;
3198 }
ff3af92b 3199 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 3200 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
3201 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
3202 else {
ef43aa38
MB		 3203 ti->error = "Invalid feature arguments";
3204 return -EINVAL;
3205 }
3206 }
3207
3208 return 0;
5ebaee6d
MB		 3209}
3210
8e225f04 3211#ifdef CONFIG_BLK_DEV_ZONED
8e225f04
DLM		 3212static int crypt_report_zones(struct dm_target *ti,
3213 struct dm_report_zones_args *args, unsigned int nr_zones)
3214{
3215 struct crypt_config *cc = ti->private;
8e225f04 3216
912e8875
DLM		 3217 return dm_report_zones(cc->dev->bdev, cc->start,
3218 cc->start + dm_target_offset(ti, args->next_sector),
3219 args, nr_zones);
8e225f04 3220}
e3290b94
MS		 3221#else
3222#define crypt_report_zones NULL
8e225f04
DLM		 3223#endif
3224
5ebaee6d
MB		 3225/*
3226 * Construct an encryption mapping:
c538f6ec 3227 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 3228 */
3229static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
3230{
3231 struct crypt_config *cc;
ed0302e8 3232 const char *devname = dm_table_device_name(ti->table);
c538f6ec 3233 int key_size;
ef43aa38 3234 unsigned int align_mask;
5ebaee6d
MB		 3235 unsigned long long tmpll;
3236 int ret;
ef43aa38 3237 size_t iv_size_padding, additional_req_size;
31998ef1 3238 char dummy;
772ae5f5 3239
772ae5f5 3240 if (argc < 5) {
5ebaee6d
MB		 3241 ti->error = "Not enough arguments";
3242 return -EINVAL;
1da177e4
LT		 3243 }
3244
c538f6ec
OK		 3245 key_size = get_key_size(&argv[1]);
3246 if (key_size < 0) {
3247 ti->error = "Cannot parse key size";
3248 return -EINVAL;
3249 }
5ebaee6d 3250
9c81c99b 3251 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL);
5ebaee6d
MB		 3252 if (!cc) {
3253 ti->error = "Cannot allocate encryption context";
3254 return -ENOMEM;
3255 }
69a8cfcd 3256 cc->key_size = key_size;
8f0009a2 3257 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 3258 cc->sector_shift = 0;
5ebaee6d
MB		 3259
3260 ti->private = cc;
ef43aa38 3261
5059353d
MP		 3262 spin_lock(&dm_crypt_clients_lock);
3263 dm_crypt_clients_n++;
3264 crypt_calculate_pages_per_client();
3265 spin_unlock(&dm_crypt_clients_lock);
3266
3267 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
3268 if (ret < 0)
3269 goto bad;
3270
ef43aa38
MB		 3271 /* Optional parameters need to be read before cipher constructor */
3272 if (argc > 5) {
3273 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
3274 if (ret)
3275 goto bad;
3276 }
3277
5ebaee6d
MB		 3278 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
3279 if (ret < 0)
3280 goto bad;
3281
33d2f09f 3282 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 3283 cc->dmreq_start = sizeof(struct aead_request);
3284 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
3285 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
3286 } else {
3287 cc->dmreq_start = sizeof(struct skcipher_request);
3288 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
3289 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
3290 }
d49ec52f
MP		 3291 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
3292
ef43aa38 3293 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 3294 /* Allocate the padding exactly */
3295 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 3296 & align_mask;
d49ec52f
MP		 3297 } else {
3298 /*
3299 * If the cipher requires greater alignment than kmalloc
3300 * alignment, we don't know the exact position of the
3301 * initialization vector. We must assume worst case.
3302 */
ef43aa38 3303 iv_size_padding = align_mask;
d49ec52f 3304 }
ddd42edf 3305
ef43aa38
MB		 3306 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
3307 additional_req_size = sizeof(struct dm_crypt_request) +
3308 iv_size_padding + cc->iv_size +
3309 cc->iv_size +
3310 sizeof(uint64_t) +
3311 sizeof(unsigned int);
3312
6f1c819c
KO		 3313 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
3314 if (ret) {
ddd42edf 3315 ti->error = "Cannot allocate crypt request mempool";
28513fcc 3316 goto bad;
ddd42edf 3317 }
ddd42edf 3318
30187e1d 3319 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 3320 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
7bc75714 3321 ARCH_DMA_MINALIGN);
298a9fa0 3322
a8affc03 3323 ret = mempool_init(&cc->page_pool, BIO_MAX_VECS, crypt_page_alloc, crypt_page_free, cc);
6f1c819c 3324 if (ret) {
72d94861 3325 ti->error = "Cannot allocate page mempool";
28513fcc 3326 goto bad;
1da177e4
LT		 3327 }
3328
6f1c819c
KO		 3329 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
3330 if (ret) {
6a24c718 3331 ti->error = "Cannot allocate crypt bioset";
28513fcc 3332 goto bad;
6a24c718
MB		 3333 }
3334
7145c241
MP		 3335 mutex_init(&cc->bio_alloc_lock);
3336
28513fcc 3337 ret = -EINVAL;
8f0009a2
MB		 3338 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
3339 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 3340 ti->error = "Invalid iv_offset sector";
28513fcc 3341 goto bad;
1da177e4 3342 }
4ee218cd 3343 cc->iv_offset = tmpll;
1da177e4 3344
e80d1c80
VG		 3345 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
3346 if (ret) {
28513fcc
MB		 3347 ti->error = "Device lookup failed";
3348 goto bad;
3349 }
3350
e80d1c80 3351 ret = -EINVAL;
ef87bfc2 3352 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 3353 ti->error = "Invalid device sector";
28513fcc 3354 goto bad;
1da177e4 3355 }
4ee218cd 3356 cc->start = tmpll;
1da177e4 3357
8e225f04 3358 if (bdev_is_zoned(cc->dev->bdev)) {
f34ee1dc
DLM		 3359 /*
3360 * For zoned block devices, we need to preserve the issuer write
3361 * ordering. To do so, disable write workqueues and force inline
3362 * encryption completion.
3363 */
8e225f04
DLM		 3364 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
3365 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags);
f34ee1dc
DLM		 3366
3367 /*
3368 * All zone append writes to a zone of a zoned block device will
3369 * have the same BIO sector, the start of the zone. When the
3370 * cypher IV mode uses sector values, all data targeting a
3371 * zone will be encrypted using the first sector numbers of the
3372 * zone. This will not result in write errors but will
3373 * cause most reads to fail as reads will use the sector values
3374 * for the actual data locations, resulting in IV mismatch.
3375 * To avoid this problem, ask DM core to emulate zone append
3376 * operations with regular writes.
3377 */
3378 DMDEBUG("Zone append operations will be emulated");
3379 ti->emulate_zone_append = true;
8e225f04
DLM		 3380 }
3381
33d2f09f 3382 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 3383 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 3384 if (ret)
3385 goto bad;
3386
ef43aa38
MB		 3387 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
3388 if (!cc->tag_pool_max_sectors)
3389 cc->tag_pool_max_sectors = 1;
f3396c58 3390
6f1c819c 3391 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 3392 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 3393 if (ret) {
ef43aa38
MB		 3394 ti->error = "Cannot allocate integrity tags mempool";
3395 goto bad;
772ae5f5 3396 }
583fe747
MP		 3397
3398 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 3399 }
3400
28513fcc 3401 ret = -ENOMEM;
f612b213 3402 cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
cabf08e4
MB		 3403 if (!cc->io_queue) {
3404 ti->error = "Couldn't create kcryptd io queue";
28513fcc 3405 goto bad;
cabf08e4
MB		 3406 }
3407
f3396c58 3408 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
48b0777c 3409 cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
ed0302e8 3410 1, devname);
f3396c58 3411 else
48b0777c
MS		 3412 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
3413 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 3414 num_online_cpus(), devname);
cabf08e4 3415 if (!cc->crypt_queue) {
9934a8be 3416 ti->error = "Couldn't create kcryptd queue";
28513fcc 3417 goto bad;
9934a8be
MB		 3418 }
3419
c7329eff 3420 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 3421 cc->write_tree = RB_ROOT;
dc267621 3422
a5217c11 3423 cc->write_thread = kthread_run(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 3424 if (IS_ERR(cc->write_thread)) {
3425 ret = PTR_ERR(cc->write_thread);
3426 cc->write_thread = NULL;
3427 ti->error = "Couldn't spawn write thread";
3428 goto bad;
3429 }
dc267621 3430
55a62eef 3431 ti->num_flush_bios = 1;
a666e5c0 3432 ti->limit_swap_bios = true;
e5524e12 3433 ti->accounts_remapped_io = true;
983c7db3 3434
58d0f180 3435 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1);
1da177e4
LT		 3436 return 0;
3437
28513fcc 3438bad:
58d0f180 3439 dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0);
28513fcc
MB		 3440 crypt_dtr(ti);
3441 return ret;
1da177e4
LT		 3442}
3443
7de3ee57 3444static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 3445{
028867ac 3446 struct dm_crypt_io *io;
49a8a920 3447 struct crypt_config *cc = ti->private;
647c7db1 3448
772ae5f5 3449 /*
28a8f0d3
MC		 3450 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
3451 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 3452 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 3453 */
1eff9d32 3454 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 3455 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 3456 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 3457 if (bio_sectors(bio))
4f024f37
KO		 3458 bio->bi_iter.bi_sector = cc->start +
3459 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 3460 return DM_MAPIO_REMAPPED;
3461 }
1da177e4 3462
4e870e94
MP		 3463 /*
3464 * Check if bio is too large, split as needed.
3465 */
a8affc03 3466 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_VECS << PAGE_SHIFT)) &&
ef43aa38 3467 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
a8affc03 3468 dm_accept_partial_bio(bio, ((BIO_MAX_VECS << PAGE_SHIFT) >> SECTOR_SHIFT));
4e870e94 3469
8f0009a2
MB		 3470 /*
3471 * Ensure that bio is a multiple of internal sector encryption size
3472 * and is aligned to this size as defined in IO hints.
3473 */
3474 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 3475 return DM_MAPIO_KILL;
8f0009a2
MB		 3476
3477 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 3478 return DM_MAPIO_KILL;
8f0009a2 3479
298a9fa0
MP		 3480 io = dm_per_bio_data(bio, cc->per_bio_data_size);
3481 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 3482
3483 if (cc->on_disk_tag_size) {
86a3238c 3484 unsigned int tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38 3485
d715fa23
HM		 3486 if (unlikely(tag_len > KMALLOC_MAX_SIZE))
3487 io->integrity_metadata = NULL;
3488 else
3489 io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
ef43aa38 3490
d715fa23 3491 if (unlikely(!io->integrity_metadata)) {
ef43aa38
MB		 3492 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
3493 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 3494 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 3495 io->integrity_metadata_from_pool = true;
3496 }
3497 }
3498
33d2f09f 3499 if (crypt_integrity_aead(cc))
ef43aa38
MB		 3500 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
3501 else
3502 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 3503
20c82538 3504 if (bio_data_dir(io->base_bio) == READ) {
e5524e12 3505 if (kcryptd_io_read(io, CRYPT_MAP_READ_GFP))
dc267621 3506 kcryptd_queue_read(io);
20c82538 3507 } else
cabf08e4 3508 kcryptd_queue_crypt(io);
1da177e4 3509
d2a7ad29 3510 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 3511}
3512
567dd8f3
MP		 3513static char hex2asc(unsigned char c)
3514{
86a3238c 3515 return c + '0' + ((unsigned int)(9 - c) >> 4 & 0x27);
567dd8f3
MP		 3516}
3517
fd7c092e 3518static void crypt_status(struct dm_target *ti, status_type_t type,
86a3238c 3519 unsigned int status_flags, char *result, unsigned int maxlen)
1da177e4 3520{
5ebaee6d 3521 struct crypt_config *cc = ti->private;
86a3238c 3522 unsigned int i, sz = 0;
f3396c58 3523 int num_feature_args = 0;
1da177e4
LT		 3524
3525 switch (type) {
3526 case STATUSTYPE_INFO:
3527 result[0] = '\0';
3528 break;
3529
3530 case STATUSTYPE_TABLE:
7dbcd137 3531 DMEMIT("%s ", cc->cipher_string);
1da177e4 3532
c538f6ec
OK		 3533 if (cc->key_size > 0) {
3534 if (cc->key_string)
3535 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
567dd8f3
MP		 3536 else {
3537 for (i = 0; i < cc->key_size; i++) {
3538 DMEMIT("%c%c", hex2asc(cc->key[i] >> 4),
3539 hex2asc(cc->key[i] & 0xf));
3540 }
3541 }
c538f6ec 3542 } else
fd7c092e 3543 DMEMIT("-");
1da177e4 3544
4ee218cd
AM		 3545 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
3546 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 3547
f3396c58
MP		 3548 num_feature_args += !!ti->num_discard_bios;
3549 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 3550 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3551 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3552 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ff3af92b 3553 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 3554 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 3555 if (cc->on_disk_tag_size)
3556 num_feature_args++;
f3396c58
MP		 3557 if (num_feature_args) {
3558 DMEMIT(" %d", num_feature_args);
3559 if (ti->num_discard_bios)
3560 DMEMIT(" allow_discards");
3561 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
3562 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 3563 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
3564 DMEMIT(" submit_from_crypt_cpus");
39d42fa9
IK		 3565 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags))
3566 DMEMIT(" no_read_workqueue");
3567 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))
3568 DMEMIT(" no_write_workqueue");
ef43aa38
MB		 3569 if (cc->on_disk_tag_size)
3570 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 3571 if (cc->sector_size != (1 << SECTOR_SHIFT))
3572 DMEMIT(" sector_size:%d", cc->sector_size);
3573 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
3574 DMEMIT(" iv_large_sectors");
f3396c58 3575 }
8ec45662
TS		 3576 break;
3577
3578 case STATUSTYPE_IMA:
3579 DMEMIT_TARGET_NAME_VERSION(ti->type);
3580 DMEMIT(",allow_discards=%c", ti->num_discard_bios ? 'y' : 'n');
3581 DMEMIT(",same_cpu_crypt=%c", test_bit(DM_CRYPT_SAME_CPU, &cc->flags) ? 'y' : 'n');
3582 DMEMIT(",submit_from_crypt_cpus=%c", test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags) ?
3583 'y' : 'n');
3584 DMEMIT(",no_read_workqueue=%c", test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags) ?
3585 'y' : 'n');
3586 DMEMIT(",no_write_workqueue=%c", test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags) ?
3587 'y' : 'n');
3588 DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ?
3589 'y' : 'n');
772ae5f5 3590
8ec45662
TS		 3591 if (cc->on_disk_tag_size)
3592 DMEMIT(",integrity_tag_size=%u,cipher_auth=%s",
3593 cc->on_disk_tag_size, cc->cipher_auth);
3594 if (cc->sector_size != (1 << SECTOR_SHIFT))
3595 DMEMIT(",sector_size=%d", cc->sector_size);
3596 if (cc->cipher_string)
3597 DMEMIT(",cipher_string=%s", cc->cipher_string);
3598
3599 DMEMIT(",key_size=%u", cc->key_size);
3600 DMEMIT(",key_parts=%u", cc->key_parts);
3601 DMEMIT(",key_extra_size=%u", cc->key_extra_size);
3602 DMEMIT(",key_mac_size=%u", cc->key_mac_size);
3603 DMEMIT(";");
1da177e4
LT		 3604 break;
3605 }
1da177e4
LT		 3606}
3607
e48d4bbf
MB		 3608static void crypt_postsuspend(struct dm_target *ti)
3609{
3610 struct crypt_config *cc = ti->private;
3611
3612 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3613}
3614
3615static int crypt_preresume(struct dm_target *ti)
3616{
3617 struct crypt_config *cc = ti->private;
3618
3619 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3620 DMERR("aborting resume - crypt key is not set.");
3621 return -EAGAIN;
3622 }
3623
3624 return 0;
3625}
3626
3627static void crypt_resume(struct dm_target *ti)
3628{
3629 struct crypt_config *cc = ti->private;
3630
3631 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3632}
3633
3634/* Message interface
3635 * key set <key>
3636 * key wipe
3637 */
86a3238c
HM		 3638static int crypt_message(struct dm_target *ti, unsigned int argc, char **argv,
3639 char *result, unsigned int maxlen)
e48d4bbf
MB		 3640{
3641 struct crypt_config *cc = ti->private;
c538f6ec 3642 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3643
3644 if (argc < 2)
3645 goto error;
3646
498f0103 3647 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3648 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3649 DMWARN("not suspended during key manipulation.");
3650 return -EINVAL;
3651 }
498f0103 3652 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3653 /* The key size may not be changed. */
3654 key_size = get_key_size(&argv[2]);
3655 if (key_size < 0 || cc->key_size != key_size) {
3656 memset(argv[2], '0', strlen(argv[2]));
3657 return -EINVAL;
3658 }
3659
542da317
MB		 3660 ret = crypt_set_key(cc, argv[2]);
3661 if (ret)
3662 return ret;
3663 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3664 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3665 /* wipe the kernel key payload copy */
3666 if (cc->key_string)
3667 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3668 return ret;
3669 }
4a52ffc7 3670 if (argc == 2 && !strcasecmp(argv[1], "wipe"))
e48d4bbf
MB		 3671 return crypt_wipe_key(cc);
3672 }
3673
3674error:
3675 DMWARN("unrecognised message received.");
3676 return -EINVAL;
3677}
3678
af4874e0
MS		 3679static int crypt_iterate_devices(struct dm_target *ti,
3680 iterate_devices_callout_fn fn, void *data)
3681{
3682 struct crypt_config *cc = ti->private;
3683
5dea271b 3684 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3685}
3686
586b286b
MS		 3687static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3688{
8f0009a2
MB		 3689 struct crypt_config *cc = ti->private;
3690
586b286b
MS		 3691 /*
3692 * Unfortunate constraint that is required to avoid the potential
3693 * for exceeding underlying device's max_segments limits -- due to
3694 * crypt_alloc_buffer() possibly allocating pages for the encryption
3695 * bio that are not as physically contiguous as the original bio.
3696 */
3697 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3698
bc9e9cf0 3699 limits->logical_block_size =
86a3238c 3700 max_t(unsigned int, limits->logical_block_size, cc->sector_size);
bc9e9cf0 3701 limits->physical_block_size =
86a3238c
HM		 3702 max_t(unsigned int, limits->physical_block_size, cc->sector_size);
3703 limits->io_min = max_t(unsigned int, limits->io_min, cc->sector_size);
86e4d3e8 3704 limits->dma_alignment = limits->logical_block_size - 1;
586b286b
MS		 3705}
3706
1da177e4
LT		 3707static struct target_type crypt_target = {
3708 .name = "crypt",
0e0c50e8 3709 .version = {1, 25, 0},
1da177e4
LT		 3710 .module = THIS_MODULE,
3711 .ctr = crypt_ctr,
3712 .dtr = crypt_dtr,
8e225f04
DLM		 3713 .features = DM_TARGET_ZONED_HM,
3714 .report_zones = crypt_report_zones,
1da177e4
LT		 3715 .map = crypt_map,
3716 .status = crypt_status,
e48d4bbf
MB		 3717 .postsuspend = crypt_postsuspend,
3718 .preresume = crypt_preresume,
3719 .resume = crypt_resume,
3720 .message = crypt_message,
af4874e0 3721 .iterate_devices = crypt_iterate_devices,
586b286b 3722 .io_hints = crypt_io_hints,
1da177e4 3723};
3664ff82 3724module_dm(crypt);
1da177e4 3725
bf14299f 3726MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3727MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3728MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)