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UBUNTU: Ubuntu-5.11.0-22.23
[mirror_ubuntu-hirsute-kernel.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
bbb16584
MB		 4 * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2020 Milan Broz <gmazyland@gmail.com>
1da177e4
LT		 6 *
7 * This file is released under the GPL.
8 */
9
43d69034 10#include <linux/completion.h>
d1806f6a 11#include <linux/err.h>
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
c538f6ec 15#include <linux/key.h>
1da177e4
LT		 16#include <linux/bio.h>
17#include <linux/blkdev.h>
18#include <linux/mempool.h>
19#include <linux/slab.h>
20#include <linux/crypto.h>
21#include <linux/workqueue.h>
dc267621 22#include <linux/kthread.h>
3fcfab16 23#include <linux/backing-dev.h>
60063497 24#include <linux/atomic.h>
378f058c 25#include <linux/scatterlist.h>
b3c5fd30 26#include <linux/rbtree.h>
027c431c 27#include <linux/ctype.h>
1da177e4 28#include <asm/page.h>
48527fa7 29#include <asm/unaligned.h>
34745785
MB		 30#include <crypto/hash.h>
31#include <crypto/md5.h>
32#include <crypto/algapi.h>
bbdb23b5 33#include <crypto/skcipher.h>
ef43aa38
MB		 34#include <crypto/aead.h>
35#include <crypto/authenc.h>
36#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */
27f5411a 37#include <linux/key-type.h>
c538f6ec 38#include <keys/user-type.h>
27f5411a 39#include <keys/encrypted-type.h>
1da177e4 40
586e80e6 41#include <linux/device-mapper.h>
1da177e4 42
72d94861 43#define DM_MSG_PREFIX "crypt"
1da177e4 44
1da177e4
LT		 45/*
46 * context holding the current state of a multi-part conversion
47 */
48struct convert_context {
43d69034 49 struct completion restart;
1da177e4
LT		 50 struct bio *bio_in;
51 struct bio *bio_out;
003b5c57
KO		 52 struct bvec_iter iter_in;
53 struct bvec_iter iter_out;
8d683dcd 54 u64 cc_sector;
40b6229b 55 atomic_t cc_pending;
ef43aa38
MB		 56 union {
57 struct skcipher_request *req;
58 struct aead_request *req_aead;
59 } r;
60
1da177e4
LT		 61};
62
53017030
MB		 63/*
64 * per bio private data
65 */
66struct dm_crypt_io {
49a8a920 67 struct crypt_config *cc;
53017030 68 struct bio *base_bio;
ef43aa38
MB		 69 u8 *integrity_metadata;
70 bool integrity_metadata_from_pool;
53017030 71 struct work_struct work;
39d42fa9 72 struct tasklet_struct tasklet;
53017030
MB		 73
74 struct convert_context ctx;
75
40b6229b 76 atomic_t io_pending;
4e4cbee9 77 blk_status_t error;
0c395b0f 78 sector_t sector;
dc267621 79
b3c5fd30 80 struct rb_node rb_node;
298a9fa0 81} CRYPTO_MINALIGN_ATTR;
53017030 82
01482b76 83struct dm_crypt_request {
b2174eeb 84 struct convert_context *ctx;
ef43aa38
MB		 85 struct scatterlist sg_in[4];
86 struct scatterlist sg_out[4];
8d683dcd 87 u64 iv_sector;
01482b76
MB		 88};
89
1da177e4
LT		 90struct crypt_config;
91
92struct crypt_iv_operations {
93 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
d469f841 94 const char *opts);
1da177e4 95 void (*dtr)(struct crypt_config *cc);
b95bf2d3 96 int (*init)(struct crypt_config *cc);
542da317 97 int (*wipe)(struct crypt_config *cc);
2dc5327d
MB		 98 int (*generator)(struct crypt_config *cc, u8 *iv,
99 struct dm_crypt_request *dmreq);
100 int (*post)(struct crypt_config *cc, u8 *iv,
101 struct dm_crypt_request *dmreq);
1da177e4
LT		 102};
103
60473592
MB		 104struct iv_benbi_private {
105 int shift;
106};
107
34745785
MB		 108#define LMK_SEED_SIZE 64 /* hash + 0 */
109struct iv_lmk_private {
110 struct crypto_shash *hash_tfm;
111 u8 *seed;
112};
113
ed04d981
MB		 114#define TCW_WHITENING_SIZE 16
115struct iv_tcw_private {
116 struct crypto_shash *crc32_tfm;
117 u8 *iv_seed;
118 u8 *whitening;
119};
120
bbb16584
MB		 121#define ELEPHANT_MAX_KEY_SIZE 32
122struct iv_elephant_private {
123 struct crypto_skcipher *tfm;
124};
125
1da177e4
LT		 126/*
127 * Crypt: maps a linear range of a block device
128 * and encrypts / decrypts at the same time.
129 */
0f5d8e6e 130enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
39d42fa9 131 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD,
8e225f04
DLM		 132 DM_CRYPT_NO_READ_WORKQUEUE, DM_CRYPT_NO_WRITE_WORKQUEUE,
133 DM_CRYPT_WRITE_INLINE };
c0297721 134
ef43aa38
MB		 135enum cipher_flags {
136 CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */
8f0009a2 137 CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */
bbb16584 138 CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */
ef43aa38
MB		 139};
140
c0297721 141/*
610f2de3 142 * The fields in here must be read only after initialization.
c0297721 143 */
1da177e4
LT		 144struct crypt_config {
145 struct dm_dev *dev;
146 sector_t start;
147
5059353d
MP		 148 struct percpu_counter n_allocated_pages;
149
cabf08e4
MB		 150 struct workqueue_struct *io_queue;
151 struct workqueue_struct *crypt_queue;
3f1e9070 152
c7329eff 153 spinlock_t write_thread_lock;
72d711c8 154 struct task_struct *write_thread;
b3c5fd30 155 struct rb_root write_tree;
dc267621 156
7dbcd137 157 char *cipher_string;
ef43aa38 158 char *cipher_auth;
c538f6ec 159 char *key_string;
5ebaee6d 160
1b1b58f5 161 const struct crypt_iv_operations *iv_gen_ops;
79066ad3 162 union {
60473592 163 struct iv_benbi_private benbi;
34745785 164 struct iv_lmk_private lmk;
ed04d981 165 struct iv_tcw_private tcw;
bbb16584 166 struct iv_elephant_private elephant;
79066ad3 167 } iv_gen_private;
8d683dcd 168 u64 iv_offset;
1da177e4 169 unsigned int iv_size;
ff3af92b
MP		 170 unsigned short int sector_size;
171 unsigned char sector_shift;
1da177e4 172
ef43aa38
MB		 173 union {
174 struct crypto_skcipher **tfms;
175 struct crypto_aead **tfms_aead;
176 } cipher_tfm;
d1f96423 177 unsigned tfms_count;
ef43aa38 178 unsigned long cipher_flags;
c0297721 179
ddd42edf
MB		 180 /*
181 * Layout of each crypto request:
182 *
bbdb23b5 183 * struct skcipher_request
ddd42edf
MB		 184 * context
185 * padding
186 * struct dm_crypt_request
187 * padding
188 * IV
189 *
190 * The padding is added so that dm_crypt_request and the IV are
191 * correctly aligned.
192 */
193 unsigned int dmreq_start;
ddd42edf 194
298a9fa0
MP		 195 unsigned int per_bio_data_size;
196
e48d4bbf 197 unsigned long flags;
1da177e4 198 unsigned int key_size;
da31a078
MB		 199 unsigned int key_parts; /* independent parts in key buffer */
200 unsigned int key_extra_size; /* additional keys length */
ef43aa38
MB		 201 unsigned int key_mac_size; /* MAC key size for authenc(...) */
202
203 unsigned int integrity_tag_size;
204 unsigned int integrity_iv_size;
205 unsigned int on_disk_tag_size;
206
72d711c8
MS		 207 /*
208 * pool for per bio private data, crypto requests,
209 * encryption requeusts/buffer pages and integrity tags
210 */
211 unsigned tag_pool_max_sectors;
212 mempool_t tag_pool;
213 mempool_t req_pool;
214 mempool_t page_pool;
215
216 struct bio_set bs;
217 struct mutex bio_alloc_lock;
218
ef43aa38 219 u8 *authenc_key; /* space for keys in authenc() format (if used) */
b18ae8dd 220 u8 key[];
1da177e4
LT		 221};
222
ef43aa38
MB		 223#define MIN_IOS 64
224#define MAX_TAG_SIZE 480
225#define POOL_ENTRY_SIZE 512
1da177e4 226
5059353d
MP		 227static DEFINE_SPINLOCK(dm_crypt_clients_lock);
228static unsigned dm_crypt_clients_n = 0;
229static volatile unsigned long dm_crypt_pages_per_client;
230#define DM_CRYPT_MEMORY_PERCENT 2
231#define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_PAGES * 16)
232
028867ac 233static void clone_init(struct dm_crypt_io *, struct bio *);
395b167c 234static void kcryptd_queue_crypt(struct dm_crypt_io *io);
ef43aa38
MB		 235static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
236 struct scatterlist *sg);
027581f3 237
3fd53533
YY		 238static bool crypt_integrity_aead(struct crypt_config *cc);
239
c0297721 240/*
86f917ad 241 * Use this to access cipher attributes that are independent of the key.
c0297721 242 */
bbdb23b5 243static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
c0297721 244{
ef43aa38
MB		 245 return cc->cipher_tfm.tfms[0];
246}
247
248static struct crypto_aead *any_tfm_aead(struct crypt_config *cc)
249{
250 return cc->cipher_tfm.tfms_aead[0];
c0297721
AK		 251}
252
1da177e4
LT		 253/*
254 * Different IV generation algorithms:
255 *
3c164bd8 256 * plain: the initial vector is the 32-bit little-endian version of the sector
3a4fa0a2 257 * number, padded with zeros if necessary.
1da177e4 258 *
61afef61
MB		 259 * plain64: the initial vector is the 64-bit little-endian version of the sector
260 * number, padded with zeros if necessary.
261 *
7e3fd855
MB		 262 * plain64be: the initial vector is the 64-bit big-endian version of the sector
263 * number, padded with zeros if necessary.
264 *
3c164bd8
RS		 265 * essiv: "encrypted sector|salt initial vector", the sector number is
266 * encrypted with the bulk cipher using a salt as key. The salt
267 * should be derived from the bulk cipher's key via hashing.
1da177e4 268 *
48527fa7
RS		 269 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
270 * (needed for LRW-32-AES and possible other narrow block modes)
271 *
46b47730
LN		 272 * null: the initial vector is always zero. Provides compatibility with
273 * obsolete loop_fish2 devices. Do not use for new devices.
274 *
34745785
MB		 275 * lmk: Compatible implementation of the block chaining mode used
276 * by the Loop-AES block device encryption system
277 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
278 * It operates on full 512 byte sectors and uses CBC
279 * with an IV derived from the sector number, the data and
280 * optionally extra IV seed.
281 * This means that after decryption the first block
282 * of sector must be tweaked according to decrypted data.
283 * Loop-AES can use three encryption schemes:
284 * version 1: is plain aes-cbc mode
285 * version 2: uses 64 multikey scheme with lmk IV generator
286 * version 3: the same as version 2 with additional IV seed
287 * (it uses 65 keys, last key is used as IV seed)
288 *
ed04d981
MB		 289 * tcw: Compatible implementation of the block chaining mode used
290 * by the TrueCrypt device encryption system (prior to version 4.1).
e44f23b3 291 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
ed04d981
MB		 292 * It operates on full 512 byte sectors and uses CBC
293 * with an IV derived from initial key and the sector number.
294 * In addition, whitening value is applied on every sector, whitening
295 * is calculated from initial key, sector number and mixed using CRC32.
296 * Note that this encryption scheme is vulnerable to watermarking attacks
297 * and should be used for old compatible containers access only.
b9411d73
MB		 298 *
299 * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode)
300 * The IV is encrypted little-endian byte-offset (with the same key
301 * and cipher as the volume).
bbb16584
MB		 302 *
303 * elephant: The extended version of eboiv with additional Elephant diffuser
304 * used with Bitlocker CBC mode.
305 * This mode was used in older Windows systems
6f3bc22b 306 * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf
1da177e4
LT		 307 */
308
2dc5327d
MB		 309static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
310 struct dm_crypt_request *dmreq)
1da177e4
LT		 311{
312 memset(iv, 0, cc->iv_size);
283a8328 313 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
1da177e4
LT		 314
315 return 0;
316}
317
61afef61 318static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
2dc5327d 319 struct dm_crypt_request *dmreq)
61afef61
MB		 320{
321 memset(iv, 0, cc->iv_size);
283a8328 322 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
61afef61
MB		 323
324 return 0;
325}
326
7e3fd855
MB		 327static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv,
328 struct dm_crypt_request *dmreq)
329{
330 memset(iv, 0, cc->iv_size);
331 /* iv_size is at least of size u64; usually it is 16 bytes */
332 *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector);
333
334 return 0;
335}
336
2dc5327d
MB		 337static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
338 struct dm_crypt_request *dmreq)
1da177e4 339{
a1a262b6
AB		 340 /*
341 * ESSIV encryption of the IV is now handled by the crypto API,
342 * so just pass the plain sector number here.
343 */
1da177e4 344 memset(iv, 0, cc->iv_size);
283a8328 345 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
c0297721 346
1da177e4
LT		 347 return 0;
348}
349
48527fa7
RS		 350static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
351 const char *opts)
352{
4ea9471f
MB		 353 unsigned bs;
354 int log;
355
3fd53533 356 if (crypt_integrity_aead(cc))
4ea9471f
MB		 357 bs = crypto_aead_blocksize(any_tfm_aead(cc));
358 else
359 bs = crypto_skcipher_blocksize(any_tfm(cc));
360 log = ilog2(bs);
48527fa7
RS		 361
362 /* we need to calculate how far we must shift the sector count
363 * to get the cipher block count, we use this shift in _gen */
364
365 if (1 << log != bs) {
366 ti->error = "cypher blocksize is not a power of 2";
367 return -EINVAL;
368 }
369
370 if (log > 9) {
371 ti->error = "cypher blocksize is > 512";
372 return -EINVAL;
373 }
374
60473592 375 cc->iv_gen_private.benbi.shift = 9 - log;
48527fa7
RS		 376
377 return 0;
378}
379
380static void crypt_iv_benbi_dtr(struct crypt_config *cc)
381{
48527fa7
RS		 382}
383
2dc5327d
MB		 384static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
385 struct dm_crypt_request *dmreq)
48527fa7 386{
79066ad3
HX		 387 __be64 val;
388
48527fa7 389 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
79066ad3 390
2dc5327d 391 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
79066ad3 392 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
48527fa7 393
1da177e4
LT		 394 return 0;
395}
396
2dc5327d
MB		 397static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
398 struct dm_crypt_request *dmreq)
46b47730
LN		 399{
400 memset(iv, 0, cc->iv_size);
401
402 return 0;
403}
404
34745785
MB		 405static void crypt_iv_lmk_dtr(struct crypt_config *cc)
406{
407 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
408
409 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
410 crypto_free_shash(lmk->hash_tfm);
411 lmk->hash_tfm = NULL;
412
453431a5 413 kfree_sensitive(lmk->seed);
34745785
MB		 414 lmk->seed = NULL;
415}
416
417static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
418 const char *opts)
419{
420 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
421
8f0009a2
MB		 422 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
423 ti->error = "Unsupported sector size for LMK";
424 return -EINVAL;
425 }
426
cd746938
MP		 427 lmk->hash_tfm = crypto_alloc_shash("md5", 0,
428 CRYPTO_ALG_ALLOCATES_MEMORY);
34745785
MB		 429 if (IS_ERR(lmk->hash_tfm)) {
430 ti->error = "Error initializing LMK hash";
431 return PTR_ERR(lmk->hash_tfm);
432 }
433
434 /* No seed in LMK version 2 */
435 if (cc->key_parts == cc->tfms_count) {
436 lmk->seed = NULL;
437 return 0;
438 }
439
440 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
441 if (!lmk->seed) {
442 crypt_iv_lmk_dtr(cc);
443 ti->error = "Error kmallocing seed storage in LMK";
444 return -ENOMEM;
445 }
446
447 return 0;
448}
449
450static int crypt_iv_lmk_init(struct crypt_config *cc)
451{
452 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
453 int subkey_size = cc->key_size / cc->key_parts;
454
455 /* LMK seed is on the position of LMK_KEYS + 1 key */
456 if (lmk->seed)
457 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
458 crypto_shash_digestsize(lmk->hash_tfm));
459
460 return 0;
461}
462
463static int crypt_iv_lmk_wipe(struct crypt_config *cc)
464{
465 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
466
467 if (lmk->seed)
468 memset(lmk->seed, 0, LMK_SEED_SIZE);
469
470 return 0;
471}
472
473static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
474 struct dm_crypt_request *dmreq,
475 u8 *data)
476{
477 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 478 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 479 struct md5_state md5state;
da31a078 480 __le32 buf[4];
34745785
MB		 481 int i, r;
482
b6106265 483 desc->tfm = lmk->hash_tfm;
34745785 484
b6106265 485 r = crypto_shash_init(desc);
34745785
MB		 486 if (r)
487 return r;
488
489 if (lmk->seed) {
b6106265 490 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 491 if (r)
492 return r;
493 }
494
495 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 496 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 497 if (r)
498 return r;
499
500 /* Sector is cropped to 56 bits here */
501 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
502 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
503 buf[2] = cpu_to_le32(4024);
504 buf[3] = 0;
b6106265 505 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 506 if (r)
507 return r;
508
509 /* No MD5 padding here */
b6106265 510 r = crypto_shash_export(desc, &md5state);
34745785
MB		 511 if (r)
512 return r;
513
514 for (i = 0; i < MD5_HASH_WORDS; i++)
515 __cpu_to_le32s(&md5state.hash[i]);
516 memcpy(iv, &md5state.hash, cc->iv_size);
517
518 return 0;
519}
520
521static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
522 struct dm_crypt_request *dmreq)
523{
ef43aa38 524 struct scatterlist *sg;
34745785
MB		 525 u8 *src;
526 int r = 0;
527
528 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 529 sg = crypt_get_sg_data(cc, dmreq->sg_in);
530 src = kmap_atomic(sg_page(sg));
531 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 532 kunmap_atomic(src);
34745785
MB		 533 } else
534 memset(iv, 0, cc->iv_size);
535
536 return r;
537}
538
539static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
540 struct dm_crypt_request *dmreq)
541{
ef43aa38 542 struct scatterlist *sg;
34745785
MB		 543 u8 *dst;
544 int r;
545
546 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
547 return 0;
548
ef43aa38
MB		 549 sg = crypt_get_sg_data(cc, dmreq->sg_out);
550 dst = kmap_atomic(sg_page(sg));
551 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 552
553 /* Tweak the first block of plaintext sector */
554 if (!r)
ef43aa38 555 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 556
c2e022cb 557 kunmap_atomic(dst);
34745785
MB		 558 return r;
559}
560
ed04d981
MB		 561static void crypt_iv_tcw_dtr(struct crypt_config *cc)
562{
563 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
564
453431a5 565 kfree_sensitive(tcw->iv_seed);
ed04d981 566 tcw->iv_seed = NULL;
453431a5 567 kfree_sensitive(tcw->whitening);
ed04d981
MB		 568 tcw->whitening = NULL;
569
570 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
571 crypto_free_shash(tcw->crc32_tfm);
572 tcw->crc32_tfm = NULL;
573}
574
575static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
576 const char *opts)
577{
578 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
579
8f0009a2
MB		 580 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
581 ti->error = "Unsupported sector size for TCW";
582 return -EINVAL;
583 }
584
ed04d981
MB		 585 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
586 ti->error = "Wrong key size for TCW";
587 return -EINVAL;
588 }
589
cd746938
MP		 590 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0,
591 CRYPTO_ALG_ALLOCATES_MEMORY);
ed04d981
MB		 592 if (IS_ERR(tcw->crc32_tfm)) {
593 ti->error = "Error initializing CRC32 in TCW";
594 return PTR_ERR(tcw->crc32_tfm);
595 }
596
597 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
598 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
599 if (!tcw->iv_seed || !tcw->whitening) {
600 crypt_iv_tcw_dtr(cc);
601 ti->error = "Error allocating seed storage in TCW";
602 return -ENOMEM;
603 }
604
605 return 0;
606}
607
608static int crypt_iv_tcw_init(struct crypt_config *cc)
609{
610 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
611 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
612
613 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
614 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
615 TCW_WHITENING_SIZE);
616
617 return 0;
618}
619
620static int crypt_iv_tcw_wipe(struct crypt_config *cc)
621{
622 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
623
624 memset(tcw->iv_seed, 0, cc->iv_size);
625 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
626
627 return 0;
628}
629
630static int crypt_iv_tcw_whitening(struct crypt_config *cc,
631 struct dm_crypt_request *dmreq,
632 u8 *data)
633{
634 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 635 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 636 u8 buf[TCW_WHITENING_SIZE];
b6106265 637 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 638 int i, r;
639
640 /* xor whitening with sector number */
45fe93df
AB		 641 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
642 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 643
644 /* calculate crc32 for every 32bit part and xor it */
b6106265 645 desc->tfm = tcw->crc32_tfm;
ed04d981 646 for (i = 0; i < 4; i++) {
b6106265 647 r = crypto_shash_init(desc);
ed04d981
MB		 648 if (r)
649 goto out;
b6106265 650 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 651 if (r)
652 goto out;
b6106265 653 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 654 if (r)
655 goto out;
656 }
657 crypto_xor(&buf[0], &buf[12], 4);
658 crypto_xor(&buf[4], &buf[8], 4);
659
660 /* apply whitening (8 bytes) to whole sector */
661 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
662 crypto_xor(data + i * 8, buf, 8);
663out:
1a71d6ff 664 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 665 return r;
666}
667
668static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
669 struct dm_crypt_request *dmreq)
670{
ef43aa38 671 struct scatterlist *sg;
ed04d981 672 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 673 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 674 u8 *src;
675 int r = 0;
676
677 /* Remove whitening from ciphertext */
678 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 679 sg = crypt_get_sg_data(cc, dmreq->sg_in);
680 src = kmap_atomic(sg_page(sg));
681 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 682 kunmap_atomic(src);
683 }
684
685 /* Calculate IV */
45fe93df 686 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 687 if (cc->iv_size > 8)
45fe93df
AB		 688 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
689 cc->iv_size - 8);
ed04d981
MB		 690
691 return r;
692}
693
694static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
695 struct dm_crypt_request *dmreq)
696{
ef43aa38 697 struct scatterlist *sg;
ed04d981
MB		 698 u8 *dst;
699 int r;
700
701 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
702 return 0;
703
704 /* Apply whitening on ciphertext */
ef43aa38
MB		 705 sg = crypt_get_sg_data(cc, dmreq->sg_out);
706 dst = kmap_atomic(sg_page(sg));
707 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 708 kunmap_atomic(dst);
709
710 return r;
711}
712
ef43aa38
MB		 713static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
714 struct dm_crypt_request *dmreq)
715{
716 /* Used only for writes, there must be an additional space to store IV */
717 get_random_bytes(iv, cc->iv_size);
718 return 0;
719}
720
b9411d73
MB		 721static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti,
722 const char *opts)
723{
3fd53533 724 if (crypt_integrity_aead(cc)) {
39d13a1a
AB		 725 ti->error = "AEAD transforms not supported for EBOIV";
726 return -EINVAL;
b9411d73
MB		 727 }
728
39d13a1a 729 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) {
b9411d73
MB		 730 ti->error = "Block size of EBOIV cipher does "
731 "not match IV size of block cipher";
b9411d73
MB		 732 return -EINVAL;
733 }
734
b9411d73
MB		 735 return 0;
736}
737
39d13a1a
AB		 738static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
739 struct dm_crypt_request *dmreq)
b9411d73 740{
39d13a1a
AB		 741 u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64));
742 struct skcipher_request *req;
743 struct scatterlist src, dst;
7785a9e4 744 DECLARE_CRYPTO_WAIT(wait);
b9411d73
MB		 745 int err;
746
9402e959 747 req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO);
39d13a1a
AB		 748 if (!req)
749 return -ENOMEM;
b9411d73 750
39d13a1a
AB		 751 memset(buf, 0, cc->iv_size);
752 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
b9411d73 753
39d13a1a
AB		 754 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size);
755 sg_init_one(&dst, iv, cc->iv_size);
756 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf);
757 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
758 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
759 skcipher_request_free(req);
b9411d73 760
39d13a1a 761 return err;
b9411d73
MB		 762}
763
bbb16584
MB		 764static void crypt_iv_elephant_dtr(struct crypt_config *cc)
765{
766 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
767
768 crypto_free_skcipher(elephant->tfm);
769 elephant->tfm = NULL;
770}
771
772static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti,
773 const char *opts)
774{
775 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
776 int r;
777
cd746938
MP		 778 elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0,
779 CRYPTO_ALG_ALLOCATES_MEMORY);
bbb16584
MB		 780 if (IS_ERR(elephant->tfm)) {
781 r = PTR_ERR(elephant->tfm);
782 elephant->tfm = NULL;
783 return r;
784 }
785
786 r = crypt_iv_eboiv_ctr(cc, ti, NULL);
787 if (r)
788 crypt_iv_elephant_dtr(cc);
789 return r;
790}
791
792static void diffuser_disk_to_cpu(u32 *d, size_t n)
793{
794#ifndef __LITTLE_ENDIAN
795 int i;
796
797 for (i = 0; i < n; i++)
798 d[i] = le32_to_cpu((__le32)d[i]);
799#endif
800}
801
802static void diffuser_cpu_to_disk(__le32 *d, size_t n)
803{
804#ifndef __LITTLE_ENDIAN
805 int i;
806
807 for (i = 0; i < n; i++)
808 d[i] = cpu_to_le32((u32)d[i]);
809#endif
810}
811
812static void diffuser_a_decrypt(u32 *d, size_t n)
813{
814 int i, i1, i2, i3;
815
816 for (i = 0; i < 5; i++) {
817 i1 = 0;
818 i2 = n - 2;
819 i3 = n - 5;
820
821 while (i1 < (n - 1)) {
822 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
823 i1++; i2++; i3++;
824
825 if (i3 >= n)
826 i3 -= n;
827
828 d[i1] += d[i2] ^ d[i3];
829 i1++; i2++; i3++;
830
831 if (i2 >= n)
832 i2 -= n;
833
834 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
835 i1++; i2++; i3++;
836
837 d[i1] += d[i2] ^ d[i3];
838 i1++; i2++; i3++;
839 }
840 }
841}
842
843static void diffuser_a_encrypt(u32 *d, size_t n)
844{
845 int i, i1, i2, i3;
846
847 for (i = 0; i < 5; i++) {
848 i1 = n - 1;
849 i2 = n - 2 - 1;
850 i3 = n - 5 - 1;
851
852 while (i1 > 0) {
853 d[i1] -= d[i2] ^ d[i3];
854 i1--; i2--; i3--;
855
856 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
857 i1--; i2--; i3--;
858
859 if (i2 < 0)
860 i2 += n;
861
862 d[i1] -= d[i2] ^ d[i3];
863 i1--; i2--; i3--;
864
865 if (i3 < 0)
866 i3 += n;
867
868 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
869 i1--; i2--; i3--;
870 }
871 }
872}
873
874static void diffuser_b_decrypt(u32 *d, size_t n)
875{
876 int i, i1, i2, i3;
877
878 for (i = 0; i < 3; i++) {
879 i1 = 0;
880 i2 = 2;
881 i3 = 5;
882
883 while (i1 < (n - 1)) {
884 d[i1] += d[i2] ^ d[i3];
885 i1++; i2++; i3++;
886
887 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
888 i1++; i2++; i3++;
889
890 if (i2 >= n)
891 i2 -= n;
892
893 d[i1] += d[i2] ^ d[i3];
894 i1++; i2++; i3++;
895
896 if (i3 >= n)
897 i3 -= n;
898
899 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
900 i1++; i2++; i3++;
901 }
902 }
903}
904
905static void diffuser_b_encrypt(u32 *d, size_t n)
906{
907 int i, i1, i2, i3;
908
909 for (i = 0; i < 3; i++) {
910 i1 = n - 1;
911 i2 = 2 - 1;
912 i3 = 5 - 1;
913
914 while (i1 > 0) {
915 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
916 i1--; i2--; i3--;
917
918 if (i3 < 0)
919 i3 += n;
920
921 d[i1] -= d[i2] ^ d[i3];
922 i1--; i2--; i3--;
923
924 if (i2 < 0)
925 i2 += n;
926
927 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
928 i1--; i2--; i3--;
929
930 d[i1] -= d[i2] ^ d[i3];
931 i1--; i2--; i3--;
932 }
933 }
934}
935
936static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq)
937{
938 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
939 u8 *es, *ks, *data, *data2, *data_offset;
940 struct skcipher_request *req;
941 struct scatterlist *sg, *sg2, src, dst;
7785a9e4 942 DECLARE_CRYPTO_WAIT(wait);
bbb16584
MB		 943 int i, r;
944
945 req = skcipher_request_alloc(elephant->tfm, GFP_NOIO);
946 es = kzalloc(16, GFP_NOIO); /* Key for AES */
947 ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */
948
949 if (!req || !es || !ks) {
950 r = -ENOMEM;
951 goto out;
952 }
953
954 *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
955
956 /* E(Ks, e(s)) */
957 sg_init_one(&src, es, 16);
958 sg_init_one(&dst, ks, 16);
959 skcipher_request_set_crypt(req, &src, &dst, 16, NULL);
960 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
961 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
962 if (r)
963 goto out;
964
965 /* E(Ks, e'(s)) */
966 es[15] = 0x80;
967 sg_init_one(&dst, &ks[16], 16);
968 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
969 if (r)
970 goto out;
971
972 sg = crypt_get_sg_data(cc, dmreq->sg_out);
973 data = kmap_atomic(sg_page(sg));
974 data_offset = data + sg->offset;
975
976 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */
977 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
978 sg2 = crypt_get_sg_data(cc, dmreq->sg_in);
979 data2 = kmap_atomic(sg_page(sg2));
980 memcpy(data_offset, data2 + sg2->offset, cc->sector_size);
981 kunmap_atomic(data2);
982 }
983
984 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
985 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
986 diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
987 diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
988 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
989 }
990
991 for (i = 0; i < (cc->sector_size / 32); i++)
992 crypto_xor(data_offset + i * 32, ks, 32);
993
994 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
995 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
996 diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
997 diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
998 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
999 }
1000
1001 kunmap_atomic(data);
1002out:
453431a5
WL		 1003 kfree_sensitive(ks);
1004 kfree_sensitive(es);
bbb16584
MB		 1005 skcipher_request_free(req);
1006 return r;
1007}
1008
1009static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv,
1010 struct dm_crypt_request *dmreq)
1011{
1012 int r;
1013
1014 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
1015 r = crypt_iv_elephant(cc, dmreq);
1016 if (r)
1017 return r;
1018 }
1019
1020 return crypt_iv_eboiv_gen(cc, iv, dmreq);
1021}
1022
1023static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv,
1024 struct dm_crypt_request *dmreq)
1025{
1026 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
1027 return crypt_iv_elephant(cc, dmreq);
1028
1029 return 0;
1030}
1031
1032static int crypt_iv_elephant_init(struct crypt_config *cc)
1033{
1034 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1035 int key_offset = cc->key_size - cc->key_extra_size;
1036
1037 return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size);
1038}
1039
1040static int crypt_iv_elephant_wipe(struct crypt_config *cc)
1041{
1042 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1043 u8 key[ELEPHANT_MAX_KEY_SIZE];
1044
1045 memset(key, 0, cc->key_extra_size);
1046 return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size);
1047}
1048
1b1b58f5 1049static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 1050 .generator = crypt_iv_plain_gen
1051};
1052
1b1b58f5 1053static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 1054 .generator = crypt_iv_plain64_gen
1055};
1056
7e3fd855
MB		 1057static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
1058 .generator = crypt_iv_plain64be_gen
1059};
1060
1b1b58f5 1061static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 1062 .generator = crypt_iv_essiv_gen
1063};
1064
1b1b58f5 1065static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 1066 .ctr = crypt_iv_benbi_ctr,
1067 .dtr = crypt_iv_benbi_dtr,
1068 .generator = crypt_iv_benbi_gen
1069};
1da177e4 1070
1b1b58f5 1071static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 1072 .generator = crypt_iv_null_gen
1073};
1074
1b1b58f5 1075static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 1076 .ctr = crypt_iv_lmk_ctr,
1077 .dtr = crypt_iv_lmk_dtr,
1078 .init = crypt_iv_lmk_init,
1079 .wipe = crypt_iv_lmk_wipe,
1080 .generator = crypt_iv_lmk_gen,
1081 .post = crypt_iv_lmk_post
1082};
1083
1b1b58f5 1084static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 1085 .ctr = crypt_iv_tcw_ctr,
1086 .dtr = crypt_iv_tcw_dtr,
1087 .init = crypt_iv_tcw_init,
1088 .wipe = crypt_iv_tcw_wipe,
1089 .generator = crypt_iv_tcw_gen,
1090 .post = crypt_iv_tcw_post
1091};
1092
e8dc79d1 1093static const struct crypt_iv_operations crypt_iv_random_ops = {
ef43aa38
MB		 1094 .generator = crypt_iv_random_gen
1095};
1096
e8dc79d1 1097static const struct crypt_iv_operations crypt_iv_eboiv_ops = {
b9411d73 1098 .ctr = crypt_iv_eboiv_ctr,
b9411d73
MB		 1099 .generator = crypt_iv_eboiv_gen
1100};
1101
e8dc79d1 1102static const struct crypt_iv_operations crypt_iv_elephant_ops = {
bbb16584
MB		 1103 .ctr = crypt_iv_elephant_ctr,
1104 .dtr = crypt_iv_elephant_dtr,
1105 .init = crypt_iv_elephant_init,
1106 .wipe = crypt_iv_elephant_wipe,
1107 .generator = crypt_iv_elephant_gen,
1108 .post = crypt_iv_elephant_post
1109};
1110
ef43aa38
MB		 1111/*
1112 * Integrity extensions
1113 */
1114static bool crypt_integrity_aead(struct crypt_config *cc)
1115{
1116 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
1117}
1118
1119static bool crypt_integrity_hmac(struct crypt_config *cc)
1120{
33d2f09f 1121 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 1122}
1123
1124/* Get sg containing data */
1125static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
1126 struct scatterlist *sg)
1127{
33d2f09f 1128 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 1129 return &sg[2];
1130
1131 return sg;
1132}
1133
1134static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
1135{
1136 struct bio_integrity_payload *bip;
1137 unsigned int tag_len;
1138 int ret;
1139
1140 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
1141 return 0;
1142
1143 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
1144 if (IS_ERR(bip))
1145 return PTR_ERR(bip);
1146
ff0c129d 1147 tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift);
ef43aa38
MB		 1148
1149 bip->bip_iter.bi_size = tag_len;
1150 bip->bip_iter.bi_sector = io->cc->start + io->sector;
1151
ef43aa38
MB		 1152 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
1153 tag_len, offset_in_page(io->integrity_metadata));
1154 if (unlikely(ret != tag_len))
1155 return -ENOMEM;
1156
1157 return 0;
1158}
1159
1160static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
1161{
1162#ifdef CONFIG_BLK_DEV_INTEGRITY
1163 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
7a1cd723 1164 struct mapped_device *md = dm_table_get_md(ti->table);
ef43aa38
MB		 1165
1166 /* From now we require underlying device with our integrity profile */
1167 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
1168 ti->error = "Integrity profile not supported.";
1169 return -EINVAL;
1170 }
1171
583fe747
MP		 1172 if (bi->tag_size != cc->on_disk_tag_size ||
1173 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 1174 ti->error = "Integrity profile tag size mismatch.";
1175 return -EINVAL;
1176 }
583fe747
MP		 1177 if (1 << bi->interval_exp != cc->sector_size) {
1178 ti->error = "Integrity profile sector size mismatch.";
1179 return -EINVAL;
1180 }
ef43aa38 1181
33d2f09f 1182 if (crypt_integrity_aead(cc)) {
ef43aa38 1183 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
7a1cd723 1184 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md),
ef43aa38
MB		 1185 cc->integrity_tag_size, cc->integrity_iv_size);
1186
1187 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
1188 ti->error = "Integrity AEAD auth tag size is not supported.";
1189 return -EINVAL;
1190 }
1191 } else if (cc->integrity_iv_size)
7a1cd723 1192 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md),
ef43aa38
MB		 1193 cc->integrity_iv_size);
1194
1195 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
1196 ti->error = "Not enough space for integrity tag in the profile.";
1197 return -EINVAL;
1198 }
1199
1200 return 0;
1201#else
1202 ti->error = "Integrity profile not supported.";
1203 return -EINVAL;
1204#endif
1205}
1206
d469f841
MB		 1207static void crypt_convert_init(struct crypt_config *cc,
1208 struct convert_context *ctx,
1209 struct bio *bio_out, struct bio *bio_in,
fcd369da 1210 sector_t sector)
1da177e4
LT		 1211{
1212 ctx->bio_in = bio_in;
1213 ctx->bio_out = bio_out;
003b5c57
KO		 1214 if (bio_in)
1215 ctx->iter_in = bio_in->bi_iter;
1216 if (bio_out)
1217 ctx->iter_out = bio_out->bi_iter;
c66029f4 1218 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1219 init_completion(&ctx->restart);
1da177e4
LT		 1220}
1221
b2174eeb 1222static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1223 void *req)
b2174eeb
HY		 1224{
1225 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1226}
1227
ef43aa38 1228static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1229{
ef43aa38 1230 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1231}
1232
2dc5327d
MB		 1233static u8 *iv_of_dmreq(struct crypt_config *cc,
1234 struct dm_crypt_request *dmreq)
1235{
33d2f09f 1236 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1237 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1238 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1239 else
1240 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1241 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1242}
1243
ef43aa38
MB		 1244static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1245 struct dm_crypt_request *dmreq)
1246{
1247 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1248}
1249
c13b5487 1250static __le64 *org_sector_of_dmreq(struct crypt_config *cc,
ef43aa38
MB		 1251 struct dm_crypt_request *dmreq)
1252{
1253 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
c13b5487 1254 return (__le64 *) ptr;
ef43aa38
MB		 1255}
1256
1257static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1258 struct dm_crypt_request *dmreq)
1259{
1260 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1261 cc->iv_size + sizeof(uint64_t);
1262 return (unsigned int*)ptr;
1263}
1264
1265static void *tag_from_dmreq(struct crypt_config *cc,
1266 struct dm_crypt_request *dmreq)
1267{
1268 struct convert_context *ctx = dmreq->ctx;
1269 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1270
1271 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1272 cc->on_disk_tag_size];
1273}
1274
1275static void *iv_tag_from_dmreq(struct crypt_config *cc,
1276 struct dm_crypt_request *dmreq)
1277{
1278 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1279}
1280
1281static int crypt_convert_block_aead(struct crypt_config *cc,
1282 struct convert_context *ctx,
1283 struct aead_request *req,
1284 unsigned int tag_offset)
01482b76 1285{
003b5c57
KO		 1286 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1287 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1288 struct dm_crypt_request *dmreq;
ef43aa38 1289 u8 *iv, *org_iv, *tag_iv, *tag;
c13b5487 1290 __le64 *sector;
ef43aa38
MB		 1291 int r = 0;
1292
1293 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1294
8f0009a2 1295 /* Reject unexpected unaligned bio. */
0440d5c0 1296 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1297 return -EIO;
3a7f6c99 1298
b2174eeb 1299 dmreq = dmreq_of_req(cc, req);
ef43aa38 1300 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1301 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1302 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1303 dmreq->ctx = ctx;
1304
1305 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1306
1307 sector = org_sector_of_dmreq(cc, dmreq);
1308 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1309
2dc5327d 1310 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1311 org_iv = org_iv_of_dmreq(cc, dmreq);
1312 tag = tag_from_dmreq(cc, dmreq);
1313 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1314
1315 /* AEAD request:
1316 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1317 * | (authenticated) | (auth+encryption) | |
1318 * | sector_LE | IV | sector in/out | tag in/out |
1319 */
1320 sg_init_table(dmreq->sg_in, 4);
1321 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1322 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1323 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1324 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1325
1326 sg_init_table(dmreq->sg_out, 4);
1327 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1328 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1329 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1330 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1331
1332 if (cc->iv_gen_ops) {
1333 /* For READs use IV stored in integrity metadata */
1334 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1335 memcpy(org_iv, tag_iv, cc->iv_size);
1336 } else {
1337 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1338 if (r < 0)
1339 return r;
1340 /* Store generated IV in integrity metadata */
1341 if (cc->integrity_iv_size)
1342 memcpy(tag_iv, org_iv, cc->iv_size);
1343 }
1344 /* Working copy of IV, to be modified in crypto API */
1345 memcpy(iv, org_iv, cc->iv_size);
1346 }
1347
1348 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1349 if (bio_data_dir(ctx->bio_in) == WRITE) {
1350 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1351 cc->sector_size, iv);
ef43aa38
MB		 1352 r = crypto_aead_encrypt(req);
1353 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1354 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1355 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1356 } else {
1357 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1358 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1359 r = crypto_aead_decrypt(req);
1360 }
1361
f710126c
MB		 1362 if (r == -EBADMSG) {
1363 char b[BDEVNAME_SIZE];
1364 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 1365 (unsigned long long)le64_to_cpu(*sector));
f710126c 1366 }
ef43aa38
MB		 1367
1368 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1369 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1370
8f0009a2
MB		 1371 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1372 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1373
ef43aa38
MB		 1374 return r;
1375}
1376
1377static int crypt_convert_block_skcipher(struct crypt_config *cc,
1378 struct convert_context *ctx,
1379 struct skcipher_request *req,
1380 unsigned int tag_offset)
1381{
1382 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1383 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1384 struct scatterlist *sg_in, *sg_out;
1385 struct dm_crypt_request *dmreq;
ef43aa38 1386 u8 *iv, *org_iv, *tag_iv;
c13b5487 1387 __le64 *sector;
ef43aa38 1388 int r = 0;
01482b76 1389
8f0009a2 1390 /* Reject unexpected unaligned bio. */
0440d5c0 1391 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1392 return -EIO;
1393
ef43aa38 1394 dmreq = dmreq_of_req(cc, req);
c66029f4 1395 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1396 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1397 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1398 dmreq->ctx = ctx;
01482b76 1399
ef43aa38
MB		 1400 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1401
1402 iv = iv_of_dmreq(cc, dmreq);
1403 org_iv = org_iv_of_dmreq(cc, dmreq);
1404 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1405
1406 sector = org_sector_of_dmreq(cc, dmreq);
1407 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1408
1409 /* For skcipher we use only the first sg item */
1410 sg_in = &dmreq->sg_in[0];
1411 sg_out = &dmreq->sg_out[0];
01482b76 1412
ef43aa38 1413 sg_init_table(sg_in, 1);
8f0009a2 1414 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1415
1416 sg_init_table(sg_out, 1);
8f0009a2 1417 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1418
3a7f6c99 1419 if (cc->iv_gen_ops) {
ef43aa38
MB		 1420 /* For READs use IV stored in integrity metadata */
1421 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1422 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1423 } else {
1424 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1425 if (r < 0)
1426 return r;
bbb16584
MB		 1427 /* Data can be already preprocessed in generator */
1428 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags))
1429 sg_in = sg_out;
ef43aa38
MB		 1430 /* Store generated IV in integrity metadata */
1431 if (cc->integrity_iv_size)
1432 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1433 }
1434 /* Working copy of IV, to be modified in crypto API */
1435 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1436 }
1437
8f0009a2 1438 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1439
1440 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1441 r = crypto_skcipher_encrypt(req);
3a7f6c99 1442 else
bbdb23b5 1443 r = crypto_skcipher_decrypt(req);
3a7f6c99 1444
2dc5327d 1445 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1446 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1447
8f0009a2
MB		 1448 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1449 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1450
3a7f6c99 1451 return r;
01482b76
MB		 1452}
1453
95497a96
MB		 1454static void kcryptd_async_done(struct crypto_async_request *async_req,
1455 int error);
c0297721 1456
d68b2958 1457static int crypt_alloc_req_skcipher(struct crypt_config *cc,
ef43aa38 1458 struct convert_context *ctx)
ddd42edf 1459{
c66029f4 1460 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1461
d68b2958
IK		 1462 if (!ctx->r.req) {
1463 ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
1464 if (!ctx->r.req)
1465 return -ENOMEM;
1466 }
c0297721 1467
ef43aa38 1468 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1469
1470 /*
1471 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1472 * requests if driver request queue is full.
1473 */
ef43aa38 1474 skcipher_request_set_callback(ctx->r.req,
432061b3 1475 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1476 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
d68b2958
IK		 1477
1478 return 0;
ddd42edf
MB		 1479}
1480
d68b2958 1481static int crypt_alloc_req_aead(struct crypt_config *cc,
ef43aa38
MB		 1482 struct convert_context *ctx)
1483{
004b8ae9
IK		 1484 if (!ctx->r.req_aead) {
1485 ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
1486 if (!ctx->r.req_aead)
d68b2958
IK		 1487 return -ENOMEM;
1488 }
c0297721 1489
ef43aa38 1490 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1491
1492 /*
1493 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1494 * requests if driver request queue is full.
1495 */
ef43aa38 1496 aead_request_set_callback(ctx->r.req_aead,
432061b3 1497 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1498 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
d68b2958
IK		 1499
1500 return 0;
ef43aa38
MB		 1501}
1502
d68b2958 1503static int crypt_alloc_req(struct crypt_config *cc,
ef43aa38
MB		 1504 struct convert_context *ctx)
1505{
33d2f09f 1506 if (crypt_integrity_aead(cc))
d68b2958 1507 return crypt_alloc_req_aead(cc, ctx);
ef43aa38 1508 else
d68b2958 1509 return crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1510}
1511
ef43aa38
MB		 1512static void crypt_free_req_skcipher(struct crypt_config *cc,
1513 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1514{
1515 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1516
bbdb23b5 1517 if ((struct skcipher_request *)(io + 1) != req)
6f1c819c 1518 mempool_free(req, &cc->req_pool);
298a9fa0
MP		 1519}
1520
ef43aa38
MB		 1521static void crypt_free_req_aead(struct crypt_config *cc,
1522 struct aead_request *req, struct bio *base_bio)
1523{
1524 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1525
1526 if ((struct aead_request *)(io + 1) != req)
6f1c819c 1527 mempool_free(req, &cc->req_pool);
ef43aa38
MB		 1528}
1529
1530static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1531{
33d2f09f 1532 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1533 crypt_free_req_aead(cc, req, base_bio);
1534 else
1535 crypt_free_req_skcipher(cc, req, base_bio);
1536}
1537
1da177e4
LT		 1538/*
1539 * Encrypt / decrypt data from one bio to another one (can be the same one)
1540 */
4e4cbee9 1541static blk_status_t crypt_convert(struct crypt_config *cc,
8abec36d 1542 struct convert_context *ctx, bool atomic, bool reset_pending)
1da177e4 1543{
ef43aa38 1544 unsigned int tag_offset = 0;
ff3af92b 1545 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1546 int r;
1da177e4 1547
8abec36d
IK		 1548 /*
1549 * if reset_pending is set we are dealing with the bio for the first time,
1550 * else we're continuing to work on the previous bio, so don't mess with
1551 * the cc_pending counter
1552 */
1553 if (reset_pending)
1554 atomic_set(&ctx->cc_pending, 1);
c8081618 1555
003b5c57 1556 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1557
d68b2958
IK		 1558 r = crypt_alloc_req(cc, ctx);
1559 if (r) {
1560 complete(&ctx->restart);
1561 return BLK_STS_DEV_RESOURCE;
1562 }
1563
40b6229b 1564 atomic_inc(&ctx->cc_pending);
3f1e9070 1565
33d2f09f 1566 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1567 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1568 else
1569 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1570
1571 switch (r) {
54cea3f6
MB		 1572 /*
1573 * The request was queued by a crypto driver
1574 * but the driver request queue is full, let's wait.
1575 */
3a7f6c99 1576 case -EBUSY:
8abec36d
IK		 1577 if (in_interrupt()) {
1578 if (try_wait_for_completion(&ctx->restart)) {
1579 /*
1580 * we don't have to block to wait for completion,
1581 * so proceed
1582 */
1583 } else {
1584 /*
1585 * we can't wait for completion without blocking
1586 * exit and continue processing in a workqueue
1587 */
1588 ctx->r.req = NULL;
1589 ctx->cc_sector += sector_step;
1590 tag_offset++;
1591 return BLK_STS_DEV_RESOURCE;
1592 }
1593 } else {
1594 wait_for_completion(&ctx->restart);
1595 }
16735d02 1596 reinit_completion(&ctx->restart);
df561f66 1597 fallthrough;
54cea3f6
MB		 1598 /*
1599 * The request is queued and processed asynchronously,
1600 * completion function kcryptd_async_done() will be called.
1601 */
c0403ec0 1602 case -EINPROGRESS:
ef43aa38 1603 ctx->r.req = NULL;
8f0009a2 1604 ctx->cc_sector += sector_step;
583fe747 1605 tag_offset++;
3f1e9070 1606 continue;
54cea3f6
MB		 1607 /*
1608 * The request was already processed (synchronously).
1609 */
3a7f6c99 1610 case 0:
40b6229b 1611 atomic_dec(&ctx->cc_pending);
8f0009a2 1612 ctx->cc_sector += sector_step;
583fe747 1613 tag_offset++;
39d42fa9
IK		 1614 if (!atomic)
1615 cond_resched();
3a7f6c99 1616 continue;
ef43aa38
MB		 1617 /*
1618 * There was a data integrity error.
1619 */
1620 case -EBADMSG:
1621 atomic_dec(&ctx->cc_pending);
4e4cbee9 1622 return BLK_STS_PROTECTION;
ef43aa38
MB		 1623 /*
1624 * There was an error while processing the request.
1625 */
3f1e9070 1626 default:
40b6229b 1627 atomic_dec(&ctx->cc_pending);
4e4cbee9 1628 return BLK_STS_IOERR;
3f1e9070 1629 }
1da177e4
LT		 1630 }
1631
3f1e9070 1632 return 0;
1da177e4
LT		 1633}
1634
cf2f1abf
MP		 1635static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1636
1da177e4
LT		 1637/*
1638 * Generate a new unfragmented bio with the given size
586b286b
MS		 1639 * This should never violate the device limitations (but only because
1640 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1641 *
1642 * This function may be called concurrently. If we allocate from the mempool
1643 * concurrently, there is a possibility of deadlock. For example, if we have
1644 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1645 * the mempool concurrently, it may deadlock in a situation where both processes
1646 * have allocated 128 pages and the mempool is exhausted.
1647 *
1648 * In order to avoid this scenario we allocate the pages under a mutex.
1649 *
1650 * In order to not degrade performance with excessive locking, we try
1651 * non-blocking allocations without a mutex first but on failure we fallback
1652 * to blocking allocations with a mutex.
1da177e4 1653 */
cf2f1abf 1654static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1655{
49a8a920 1656 struct crypt_config *cc = io->cc;
8b004457 1657 struct bio *clone;
1da177e4 1658 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1659 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1660 unsigned i, len, remaining_size;
91e10625 1661 struct page *page;
1da177e4 1662
7145c241 1663retry:
d0164adc 1664 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1665 mutex_lock(&cc->bio_alloc_lock);
1666
6f1c819c 1667 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs);
8b004457 1668 if (!clone)
ef43aa38 1669 goto out;
1da177e4 1670
027581f3 1671 clone_init(io, clone);
6a24c718 1672
7145c241
MP		 1673 remaining_size = size;
1674
f97380bc 1675 for (i = 0; i < nr_iovecs; i++) {
6f1c819c 1676 page = mempool_alloc(&cc->page_pool, gfp_mask);
7145c241
MP		 1677 if (!page) {
1678 crypt_free_buffer_pages(cc, clone);
1679 bio_put(clone);
d0164adc 1680 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1681 goto retry;
1682 }
1da177e4 1683
7145c241 1684 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1685
0dae7fe5 1686 bio_add_page(clone, page, len, 0);
1da177e4 1687
7145c241 1688 remaining_size -= len;
1da177e4
LT		 1689 }
1690
ef43aa38
MB		 1691 /* Allocate space for integrity tags */
1692 if (dm_crypt_integrity_io_alloc(io, clone)) {
1693 crypt_free_buffer_pages(cc, clone);
1694 bio_put(clone);
1695 clone = NULL;
1696 }
1697out:
d0164adc 1698 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1699 mutex_unlock(&cc->bio_alloc_lock);
1700
8b004457 1701 return clone;
1da177e4
LT		 1702}
1703
644bd2f0 1704static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1705{
1da177e4 1706 struct bio_vec *bv;
6dc4f100 1707 struct bvec_iter_all iter_all;
1da177e4 1708
2b070cfe 1709 bio_for_each_segment_all(bv, clone, iter_all) {
1da177e4 1710 BUG_ON(!bv->bv_page);
6f1c819c 1711 mempool_free(bv->bv_page, &cc->page_pool);
1da177e4
LT		 1712 }
1713}
1714
298a9fa0
MP		 1715static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1716 struct bio *bio, sector_t sector)
dc440d1e 1717{
49a8a920 1718 io->cc = cc;
dc440d1e
MB		 1719 io->base_bio = bio;
1720 io->sector = sector;
1721 io->error = 0;
ef43aa38
MB		 1722 io->ctx.r.req = NULL;
1723 io->integrity_metadata = NULL;
1724 io->integrity_metadata_from_pool = false;
40b6229b 1725 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1726}
1727
3e1a8bdd
MB		 1728static void crypt_inc_pending(struct dm_crypt_io *io)
1729{
40b6229b 1730 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1731}
1732
8e14f610
IK		 1733static void kcryptd_io_bio_endio(struct work_struct *work)
1734{
1735 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1736 bio_endio(io->base_bio);
1737}
1738
1da177e4
LT		 1739/*
1740 * One of the bios was finished. Check for completion of
1741 * the whole request and correctly clean up the buffer.
1742 */
5742fd77 1743static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1744{
49a8a920 1745 struct crypt_config *cc = io->cc;
b35f8caa 1746 struct bio *base_bio = io->base_bio;
4e4cbee9 1747 blk_status_t error = io->error;
1da177e4 1748
40b6229b 1749 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1750 return;
1751
ef43aa38
MB		 1752 if (io->ctx.r.req)
1753 crypt_free_req(cc, io->ctx.r.req, base_bio);
1754
1755 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1756 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1757 else
1758 kfree(io->integrity_metadata);
b35f8caa 1759
4e4cbee9 1760 base_bio->bi_status = error;
8e14f610
IK		 1761
1762 /*
1763 * If we are running this function from our tasklet,
1764 * we can't call bio_endio() here, because it will call
1765 * clone_endio() from dm.c, which in turn will
1766 * free the current struct dm_crypt_io structure with
1767 * our tasklet. In this case we need to delay bio_endio()
1768 * execution to after the tasklet is done and dequeued.
1769 */
1770 if (tasklet_trylock(&io->tasklet)) {
1771 tasklet_unlock(&io->tasklet);
1772 bio_endio(base_bio);
1773 return;
1774 }
1775
1776 INIT_WORK(&io->work, kcryptd_io_bio_endio);
1777 queue_work(cc->io_queue, &io->work);
1da177e4
LT		 1778}
1779
1780/*
cabf08e4 1781 * kcryptd/kcryptd_io:
1da177e4
LT		 1782 *
1783 * Needed because it would be very unwise to do decryption in an
23541d2d 1784 * interrupt context.
cabf08e4
MB		 1785 *
1786 * kcryptd performs the actual encryption or decryption.
1787 *
1788 * kcryptd_io performs the IO submission.
1789 *
1790 * They must be separated as otherwise the final stages could be
1791 * starved by new requests which can block in the first stages due
1792 * to memory allocation.
c0297721
AK		 1793 *
1794 * The work is done per CPU global for all dm-crypt instances.
1795 * They should not depend on each other and do not block.
1da177e4 1796 */
4246a0b6 1797static void crypt_endio(struct bio *clone)
8b004457 1798{
028867ac 1799 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1800 struct crypt_config *cc = io->cc;
ee7a491e 1801 unsigned rw = bio_data_dir(clone);
4e4cbee9 1802 blk_status_t error;
8b004457
MB		 1803
1804 /*
6712ecf8 1805 * free the processed pages
8b004457 1806 */
ee7a491e 1807 if (rw == WRITE)
644bd2f0 1808 crypt_free_buffer_pages(cc, clone);
8b004457 1809
4e4cbee9 1810 error = clone->bi_status;
8b004457 1811 bio_put(clone);
8b004457 1812
9b81c842 1813 if (rw == READ && !error) {
ee7a491e
MB		 1814 kcryptd_queue_crypt(io);
1815 return;
1816 }
5742fd77 1817
9b81c842
SL		 1818 if (unlikely(error))
1819 io->error = error;
5742fd77
MB		 1820
1821 crypt_dec_pending(io);
8b004457
MB		 1822}
1823
028867ac 1824static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1825{
49a8a920 1826 struct crypt_config *cc = io->cc;
8b004457
MB		 1827
1828 clone->bi_private = io;
1829 clone->bi_end_io = crypt_endio;
74d46992 1830 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1831 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1832}
1833
20c82538 1834static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1835{
49a8a920 1836 struct crypt_config *cc = io->cc;
8b004457 1837 struct bio *clone;
93e605c2 1838
8b004457 1839 /*
59779079
MS		 1840 * We need the original biovec array in order to decrypt
1841 * the whole bio data *afterwards* -- thanks to immutable
1842 * biovecs we don't need to worry about the block layer
1843 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1844 */
6f1c819c 1845 clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
7eaceacc 1846 if (!clone)
20c82538 1847 return 1;
8b004457 1848
20c82538
MB		 1849 crypt_inc_pending(io);
1850
8b004457 1851 clone_init(io, clone);
4f024f37 1852 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1853
ef43aa38
MB		 1854 if (dm_crypt_integrity_io_alloc(io, clone)) {
1855 crypt_dec_pending(io);
1856 bio_put(clone);
1857 return 1;
1858 }
1859
ed00aabd 1860 submit_bio_noacct(clone);
20c82538 1861 return 0;
8b004457
MB		 1862}
1863
dc267621
MP		 1864static void kcryptd_io_read_work(struct work_struct *work)
1865{
1866 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1867
1868 crypt_inc_pending(io);
1869 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1870 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1871 crypt_dec_pending(io);
1872}
1873
1874static void kcryptd_queue_read(struct dm_crypt_io *io)
1875{
1876 struct crypt_config *cc = io->cc;
1877
1878 INIT_WORK(&io->work, kcryptd_io_read_work);
1879 queue_work(cc->io_queue, &io->work);
1880}
1881
4e4eef64
MB		 1882static void kcryptd_io_write(struct dm_crypt_io *io)
1883{
95497a96 1884 struct bio *clone = io->ctx.bio_out;
dc267621 1885
ed00aabd 1886 submit_bio_noacct(clone);
4e4eef64
MB		 1887}
1888
b3c5fd30
MP		 1889#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1890
dc267621 1891static int dmcrypt_write(void *data)
395b167c 1892{
dc267621 1893 struct crypt_config *cc = data;
b3c5fd30
MP		 1894 struct dm_crypt_io *io;
1895
dc267621 1896 while (1) {
b3c5fd30 1897 struct rb_root write_tree;
dc267621 1898 struct blk_plug plug;
395b167c 1899
c7329eff 1900 spin_lock_irq(&cc->write_thread_lock);
dc267621 1901continue_locked:
395b167c 1902
b3c5fd30 1903 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1904 goto pop_from_list;
1905
f659b100 1906 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1907
c7329eff 1908 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1909
f659b100 1910 if (unlikely(kthread_should_stop())) {
642fa448 1911 set_current_state(TASK_RUNNING);
f659b100
RV		 1912 break;
1913 }
1914
dc267621
MP		 1915 schedule();
1916
642fa448 1917 set_current_state(TASK_RUNNING);
c7329eff 1918 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1919 goto continue_locked;
1920
1921pop_from_list:
b3c5fd30
MP		 1922 write_tree = cc->write_tree;
1923 cc->write_tree = RB_ROOT;
c7329eff 1924 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1925
b3c5fd30
MP		 1926 BUG_ON(rb_parent(write_tree.rb_node));
1927
1928 /*
1929 * Note: we cannot walk the tree here with rb_next because
1930 * the structures may be freed when kcryptd_io_write is called.
1931 */
dc267621
MP		 1932 blk_start_plug(&plug);
1933 do {
b3c5fd30
MP		 1934 io = crypt_io_from_node(rb_first(&write_tree));
1935 rb_erase(&io->rb_node, &write_tree);
dc267621 1936 kcryptd_io_write(io);
b3c5fd30 1937 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1938 blk_finish_plug(&plug);
1939 }
1940 return 0;
395b167c
AK		 1941}
1942
72c6e7af 1943static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1944{
dec1cedf 1945 struct bio *clone = io->ctx.bio_out;
49a8a920 1946 struct crypt_config *cc = io->cc;
dc267621 1947 unsigned long flags;
b3c5fd30
MP		 1948 sector_t sector;
1949 struct rb_node **rbp, *parent;
dec1cedf 1950
4e4cbee9 1951 if (unlikely(io->error)) {
dec1cedf
MB		 1952 crypt_free_buffer_pages(cc, clone);
1953 bio_put(clone);
6c031f41 1954 crypt_dec_pending(io);
dec1cedf
MB		 1955 return;
1956 }
1957
1958 /* crypt_convert should have filled the clone bio */
003b5c57 1959 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1960
4f024f37 1961 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1962
39d42fa9
IK		 1963 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) ||
1964 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) {
ed00aabd 1965 submit_bio_noacct(clone);
0f5d8e6e
MP		 1966 return;
1967 }
1968
c7329eff
MP		 1969 spin_lock_irqsave(&cc->write_thread_lock, flags);
1970 if (RB_EMPTY_ROOT(&cc->write_tree))
1971 wake_up_process(cc->write_thread);
b3c5fd30
MP		 1972 rbp = &cc->write_tree.rb_node;
1973 parent = NULL;
1974 sector = io->sector;
1975 while (*rbp) {
1976 parent = *rbp;
1977 if (sector < crypt_io_from_node(parent)->sector)
1978 rbp = &(*rbp)->rb_left;
1979 else
1980 rbp = &(*rbp)->rb_right;
1981 }
1982 rb_link_node(&io->rb_node, parent, rbp);
1983 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 1984 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 1985}
1986
8e225f04
DLM		 1987static bool kcryptd_crypt_write_inline(struct crypt_config *cc,
1988 struct convert_context *ctx)
1989
1990{
1991 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags))
1992 return false;
1993
1994 /*
1995 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering
1996 * constraints so they do not need to be issued inline by
1997 * kcryptd_crypt_write_convert().
1998 */
1999 switch (bio_op(ctx->bio_in)) {
2000 case REQ_OP_WRITE:
2001 case REQ_OP_WRITE_SAME:
2002 case REQ_OP_WRITE_ZEROES:
2003 return true;
2004 default:
2005 return false;
2006 }
2007}
2008
8abec36d
IK		 2009static void kcryptd_crypt_write_continue(struct work_struct *work)
2010{
2011 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
2012 struct crypt_config *cc = io->cc;
2013 struct convert_context *ctx = &io->ctx;
2014 int crypt_finished;
2015 sector_t sector = io->sector;
2016 blk_status_t r;
2017
2018 wait_for_completion(&ctx->restart);
2019 reinit_completion(&ctx->restart);
2020
2021 r = crypt_convert(cc, &io->ctx, true, false);
2022 if (r)
2023 io->error = r;
2024 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2025 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2026 /* Wait for completion signaled by kcryptd_async_done() */
2027 wait_for_completion(&ctx->restart);
2028 crypt_finished = 1;
2029 }
2030
2031 /* Encryption was already finished, submit io now */
2032 if (crypt_finished) {
2033 kcryptd_crypt_write_io_submit(io, 0);
2034 io->sector = sector;
2035 }
2036
2037 crypt_dec_pending(io);
2038}
2039
fc5a5e9a 2040static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 2041{
49a8a920 2042 struct crypt_config *cc = io->cc;
8e225f04 2043 struct convert_context *ctx = &io->ctx;
8b004457 2044 struct bio *clone;
c8081618 2045 int crypt_finished;
b635b00e 2046 sector_t sector = io->sector;
4e4cbee9 2047 blk_status_t r;
8b004457 2048
fc5a5e9a
MB		 2049 /*
2050 * Prevent io from disappearing until this function completes.
2051 */
2052 crypt_inc_pending(io);
8e225f04 2053 crypt_convert_init(cc, ctx, NULL, io->base_bio, sector);
fc5a5e9a 2054
cf2f1abf
MP		 2055 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
2056 if (unlikely(!clone)) {
4e4cbee9 2057 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 2058 goto dec;
2059 }
c8081618 2060
cf2f1abf
MP		 2061 io->ctx.bio_out = clone;
2062 io->ctx.iter_out = clone->bi_iter;
b635b00e 2063
cf2f1abf 2064 sector += bio_sectors(clone);
93e605c2 2065
cf2f1abf 2066 crypt_inc_pending(io);
8e225f04 2067 r = crypt_convert(cc, ctx,
8abec36d
IK		 2068 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true);
2069 /*
2070 * Crypto API backlogged the request, because its queue was full
2071 * and we're in softirq context, so continue from a workqueue
2072 * (TODO: is it actually possible to be in softirq in the write path?)
2073 */
2074 if (r == BLK_STS_DEV_RESOURCE) {
2075 INIT_WORK(&io->work, kcryptd_crypt_write_continue);
2076 queue_work(cc->crypt_queue, &io->work);
2077 return;
2078 }
4e4cbee9 2079 if (r)
ef43aa38 2080 io->error = r;
8e225f04
DLM		 2081 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2082 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2083 /* Wait for completion signaled by kcryptd_async_done() */
2084 wait_for_completion(&ctx->restart);
2085 crypt_finished = 1;
2086 }
933f01d4 2087
cf2f1abf
MP		 2088 /* Encryption was already finished, submit io now */
2089 if (crypt_finished) {
2090 kcryptd_crypt_write_io_submit(io, 0);
2091 io->sector = sector;
93e605c2 2092 }
899c95d3 2093
cf2f1abf 2094dec:
899c95d3 2095 crypt_dec_pending(io);
84131db6
MB		 2096}
2097
72c6e7af 2098static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 2099{
5742fd77
MB		 2100 crypt_dec_pending(io);
2101}
2102
8abec36d
IK		 2103static void kcryptd_crypt_read_continue(struct work_struct *work)
2104{
2105 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
2106 struct crypt_config *cc = io->cc;
2107 blk_status_t r;
2108
2109 wait_for_completion(&io->ctx.restart);
2110 reinit_completion(&io->ctx.restart);
2111
2112 r = crypt_convert(cc, &io->ctx, true, false);
2113 if (r)
2114 io->error = r;
2115
2116 if (atomic_dec_and_test(&io->ctx.cc_pending))
2117 kcryptd_crypt_read_done(io);
2118
2119 crypt_dec_pending(io);
2120}
2121
4e4eef64 2122static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 2123{
49a8a920 2124 struct crypt_config *cc = io->cc;
4e4cbee9 2125 blk_status_t r;
1da177e4 2126
3e1a8bdd 2127 crypt_inc_pending(io);
3a7f6c99 2128
53017030 2129 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 2130 io->sector);
1da177e4 2131
39d42fa9 2132 r = crypt_convert(cc, &io->ctx,
8abec36d
IK		 2133 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true);
2134 /*
2135 * Crypto API backlogged the request, because its queue was full
2136 * and we're in softirq context, so continue from a workqueue
2137 */
2138 if (r == BLK_STS_DEV_RESOURCE) {
2139 INIT_WORK(&io->work, kcryptd_crypt_read_continue);
2140 queue_work(cc->crypt_queue, &io->work);
2141 return;
2142 }
4e4cbee9 2143 if (r)
ef43aa38 2144 io->error = r;
5742fd77 2145
40b6229b 2146 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 2147 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 2148
2149 crypt_dec_pending(io);
1da177e4
LT		 2150}
2151
95497a96
MB		 2152static void kcryptd_async_done(struct crypto_async_request *async_req,
2153 int error)
2154{
b2174eeb
HY		 2155 struct dm_crypt_request *dmreq = async_req->data;
2156 struct convert_context *ctx = dmreq->ctx;
95497a96 2157 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 2158 struct crypt_config *cc = io->cc;
95497a96 2159
54cea3f6
MB		 2160 /*
2161 * A request from crypto driver backlog is going to be processed now,
2162 * finish the completion and continue in crypt_convert().
2163 * (Callback will be called for the second time for this request.)
2164 */
c0403ec0
RV		 2165 if (error == -EINPROGRESS) {
2166 complete(&ctx->restart);
95497a96 2167 return;
c0403ec0 2168 }
95497a96 2169
2dc5327d 2170 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 2171 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 2172
ef43aa38 2173 if (error == -EBADMSG) {
f710126c
MB		 2174 char b[BDEVNAME_SIZE];
2175 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 2176 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 2177 io->error = BLK_STS_PROTECTION;
ef43aa38 2178 } else if (error < 0)
4e4cbee9 2179 io->error = BLK_STS_IOERR;
72c6e7af 2180
298a9fa0 2181 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 2182
40b6229b 2183 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 2184 return;
95497a96 2185
8e225f04
DLM		 2186 /*
2187 * The request is fully completed: for inline writes, let
2188 * kcryptd_crypt_write_convert() do the IO submission.
2189 */
2190 if (bio_data_dir(io->base_bio) == READ) {
72c6e7af 2191 kcryptd_crypt_read_done(io);
8e225f04
DLM		 2192 return;
2193 }
2194
2195 if (kcryptd_crypt_write_inline(cc, ctx)) {
2196 complete(&ctx->restart);
2197 return;
2198 }
2199
2200 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 2201}
2202
395b167c 2203static void kcryptd_crypt(struct work_struct *work)
1da177e4 2204{
028867ac 2205 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 2206
cabf08e4 2207 if (bio_data_dir(io->base_bio) == READ)
395b167c 2208 kcryptd_crypt_read_convert(io);
4e4eef64 2209 else
395b167c 2210 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 2211}
2212
39d42fa9
IK		 2213static void kcryptd_crypt_tasklet(unsigned long work)
2214{
2215 kcryptd_crypt((struct work_struct *)work);
2216}
2217
395b167c 2218static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 2219{
49a8a920 2220 struct crypt_config *cc = io->cc;
cabf08e4 2221
39d42fa9
IK		 2222 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) ||
2223 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) {
c87a95dc
IK		 2224 /*
2225 * in_irq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context.
2226 * irqs_disabled(): the kernel may run some IO completion from the idle thread, but
2227 * it is being executed with irqs disabled.
2228 */
2229 if (in_irq() || irqs_disabled()) {
39d42fa9
IK		 2230 tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work);
2231 tasklet_schedule(&io->tasklet);
2232 return;
2233 }
2234
2235 kcryptd_crypt(&io->work);
2236 return;
2237 }
2238
395b167c
AK		 2239 INIT_WORK(&io->work, kcryptd_crypt);
2240 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 2241}
2242
ef43aa38 2243static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 2244{
ef43aa38
MB		 2245 if (!cc->cipher_tfm.tfms_aead)
2246 return;
1da177e4 2247
ef43aa38
MB		 2248 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2249 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
2250 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 2251 }
2252
ef43aa38
MB		 2253 kfree(cc->cipher_tfm.tfms_aead);
2254 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 2255}
2256
ef43aa38 2257static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 2258{
d1f96423
MB		 2259 unsigned i;
2260
ef43aa38 2261 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2262 return;
2263
d1f96423 2264 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 2265 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
2266 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
2267 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 2268 }
fd2d231f 2269
ef43aa38
MB		 2270 kfree(cc->cipher_tfm.tfms);
2271 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 2272}
2273
ef43aa38
MB		 2274static void crypt_free_tfms(struct crypt_config *cc)
2275{
33d2f09f 2276 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2277 crypt_free_tfms_aead(cc);
2278 else
2279 crypt_free_tfms_skcipher(cc);
2280}
2281
2282static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 2283{
d1f96423
MB		 2284 unsigned i;
2285 int err;
2286
6396bb22
KC		 2287 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
2288 sizeof(struct crypto_skcipher *),
2289 GFP_KERNEL);
ef43aa38 2290 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2291 return -ENOMEM;
2292
d1f96423 2293 for (i = 0; i < cc->tfms_count; i++) {
cd746938
MP		 2294 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0,
2295 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2296 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
2297 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 2298 crypt_free_tfms(cc);
d1f96423
MB		 2299 return err;
2300 }
2301 }
2302
af331eba
EB		 2303 /*
2304 * dm-crypt performance can vary greatly depending on which crypto
2305 * algorithm implementation is used. Help people debug performance
2306 * problems by logging the ->cra_driver_name.
2307 */
7a1cd723 2308 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2309 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 2310 return 0;
2311}
2312
ef43aa38
MB		 2313static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
2314{
ef43aa38
MB		 2315 int err;
2316
2317 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
2318 if (!cc->cipher_tfm.tfms)
2319 return -ENOMEM;
2320
cd746938
MP		 2321 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0,
2322 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2323 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2324 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
2325 crypt_free_tfms(cc);
2326 return err;
2327 }
2328
7a1cd723 2329 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2330 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 2331 return 0;
2332}
2333
2334static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
2335{
33d2f09f 2336 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2337 return crypt_alloc_tfms_aead(cc, ciphermode);
2338 else
2339 return crypt_alloc_tfms_skcipher(cc, ciphermode);
2340}
2341
2342static unsigned crypt_subkey_size(struct crypt_config *cc)
2343{
2344 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
2345}
2346
2347static unsigned crypt_authenckey_size(struct crypt_config *cc)
2348{
2349 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
2350}
2351
2352/*
2353 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
2354 * the key must be for some reason in special format.
2355 * This funcion converts cc->key to this special format.
2356 */
2357static void crypt_copy_authenckey(char *p, const void *key,
2358 unsigned enckeylen, unsigned authkeylen)
2359{
2360 struct crypto_authenc_key_param *param;
2361 struct rtattr *rta;
2362
2363 rta = (struct rtattr *)p;
2364 param = RTA_DATA(rta);
2365 param->enckeylen = cpu_to_be32(enckeylen);
2366 rta->rta_len = RTA_LENGTH(sizeof(*param));
2367 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
2368 p += RTA_SPACE(sizeof(*param));
2369 memcpy(p, key + enckeylen, authkeylen);
2370 p += authkeylen;
2371 memcpy(p, key, enckeylen);
2372}
2373
671ea6b4 2374static int crypt_setkey(struct crypt_config *cc)
c0297721 2375{
da31a078 2376 unsigned subkey_size;
fd2d231f
MP		 2377 int err = 0, i, r;
2378
da31a078 2379 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 2380 subkey_size = crypt_subkey_size(cc);
da31a078 2381
27c70036
MB		 2382 if (crypt_integrity_hmac(cc)) {
2383 if (subkey_size < cc->key_mac_size)
2384 return -EINVAL;
2385
ef43aa38
MB		 2386 crypt_copy_authenckey(cc->authenc_key, cc->key,
2387 subkey_size - cc->key_mac_size,
2388 cc->key_mac_size);
27c70036
MB		 2389 }
2390
fd2d231f 2391 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 2392 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 2393 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2394 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 2395 else if (crypt_integrity_aead(cc))
2396 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2397 cc->key + (i * subkey_size),
2398 subkey_size);
ef43aa38
MB		 2399 else
2400 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
2401 cc->key + (i * subkey_size),
2402 subkey_size);
fd2d231f
MP		 2403 if (r)
2404 err = r;
c0297721
AK		 2405 }
2406
ef43aa38
MB		 2407 if (crypt_integrity_hmac(cc))
2408 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
2409
c0297721
AK		 2410 return err;
2411}
2412
c538f6ec
OK		 2413#ifdef CONFIG_KEYS
2414
027c431c
OK		 2415static bool contains_whitespace(const char *str)
2416{
2417 while (*str)
2418 if (isspace(*str++))
2419 return true;
2420 return false;
2421}
2422
27f5411a
DB		 2423static int set_key_user(struct crypt_config *cc, struct key *key)
2424{
2425 const struct user_key_payload *ukp;
2426
2427 ukp = user_key_payload_locked(key);
2428 if (!ukp)
2429 return -EKEYREVOKED;
2430
2431 if (cc->key_size != ukp->datalen)
2432 return -EINVAL;
2433
2434 memcpy(cc->key, ukp->data, cc->key_size);
2435
2436 return 0;
2437}
2438
2439#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2440static int set_key_encrypted(struct crypt_config *cc, struct key *key)
2441{
2442 const struct encrypted_key_payload *ekp;
2443
2444 ekp = key->payload.data[0];
2445 if (!ekp)
2446 return -EKEYREVOKED;
2447
2448 if (cc->key_size != ekp->decrypted_datalen)
2449 return -EINVAL;
2450
2451 memcpy(cc->key, ekp->decrypted_data, cc->key_size);
2452
2453 return 0;
2454}
2455#endif /* CONFIG_ENCRYPTED_KEYS */
2456
c538f6ec
OK		 2457static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2458{
2459 char *new_key_string, *key_desc;
2460 int ret;
27f5411a 2461 struct key_type *type;
c538f6ec 2462 struct key *key;
27f5411a 2463 int (*set_key)(struct crypt_config *cc, struct key *key);
c538f6ec 2464
027c431c
OK		 2465 /*
2466 * Reject key_string with whitespace. dm core currently lacks code for
2467 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2468 */
2469 if (contains_whitespace(key_string)) {
2470 DMERR("whitespace chars not allowed in key string");
2471 return -EINVAL;
2472 }
2473
c538f6ec
OK		 2474 /* look for next ':' separating key_type from key_description */
2475 key_desc = strpbrk(key_string, ":");
2476 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2477 return -EINVAL;
2478
27f5411a
DB		 2479 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
2480 type = &key_type_logon;
2481 set_key = set_key_user;
2482 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
2483 type = &key_type_user;
2484 set_key = set_key_user;
2485#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2486 } else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
2487 type = &key_type_encrypted;
2488 set_key = set_key_encrypted;
2489#endif
2490 } else {
c538f6ec 2491 return -EINVAL;
27f5411a 2492 }
c538f6ec
OK		 2493
2494 new_key_string = kstrdup(key_string, GFP_KERNEL);
2495 if (!new_key_string)
2496 return -ENOMEM;
2497
27f5411a 2498 key = request_key(type, key_desc + 1, NULL);
c538f6ec 2499 if (IS_ERR(key)) {
453431a5 2500 kfree_sensitive(new_key_string);
c538f6ec
OK		 2501 return PTR_ERR(key);
2502 }
2503
f5b0cba8 2504 down_read(&key->sem);
c538f6ec 2505
27f5411a
DB		 2506 ret = set_key(cc, key);
2507 if (ret < 0) {
f5b0cba8 2508 up_read(&key->sem);
c538f6ec 2509 key_put(key);
453431a5 2510 kfree_sensitive(new_key_string);
27f5411a 2511 return ret;
c538f6ec
OK		 2512 }
2513
f5b0cba8 2514 up_read(&key->sem);
c538f6ec
OK		 2515 key_put(key);
2516
2517 /* clear the flag since following operations may invalidate previously valid key */
2518 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2519
2520 ret = crypt_setkey(cc);
2521
c538f6ec
OK		 2522 if (!ret) {
2523 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
453431a5 2524 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2525 cc->key_string = new_key_string;
2526 } else
453431a5 2527 kfree_sensitive(new_key_string);
c538f6ec
OK		 2528
2529 return ret;
2530}
2531
2532static int get_key_size(char **key_string)
2533{
2534 char *colon, dummy;
2535 int ret;
2536
2537 if (*key_string[0] != ':')
2538 return strlen(*key_string) >> 1;
2539
2540 /* look for next ':' in key string */
2541 colon = strpbrk(*key_string + 1, ":");
2542 if (!colon)
2543 return -EINVAL;
2544
2545 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2546 return -EINVAL;
2547
2548 *key_string = colon;
2549
2550 /* remaining key string should be :<logon|user>:<key_desc> */
2551
2552 return ret;
2553}
2554
2555#else
2556
2557static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2558{
2559 return -EINVAL;
2560}
2561
2562static int get_key_size(char **key_string)
2563{
2564 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2565}
2566
27f5411a 2567#endif /* CONFIG_KEYS */
c538f6ec 2568
e48d4bbf
MB		 2569static int crypt_set_key(struct crypt_config *cc, char *key)
2570{
de8be5ac
MB		 2571 int r = -EINVAL;
2572 int key_string_len = strlen(key);
2573
69a8cfcd
MB		 2574 /* Hyphen (which gives a key_size of zero) means there is no key. */
2575 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2576 goto out;
e48d4bbf 2577
c538f6ec
OK		 2578 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2579 if (key[0] == ':') {
2580 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2581 goto out;
c538f6ec 2582 }
e48d4bbf 2583
265e9098
OK		 2584 /* clear the flag since following operations may invalidate previously valid key */
2585 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2586
c538f6ec 2587 /* wipe references to any kernel keyring key */
453431a5 2588 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2589 cc->key_string = NULL;
2590
e944e03e
AS		 2591 /* Decode key from its hex representation. */
2592 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2593 goto out;
e48d4bbf 2594
671ea6b4 2595 r = crypt_setkey(cc);
265e9098
OK		 2596 if (!r)
2597 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2598
2599out:
2600 /* Hex key string not needed after here, so wipe it. */
2601 memset(key, '0', key_string_len);
2602
2603 return r;
e48d4bbf
MB		 2604}
2605
2606static int crypt_wipe_key(struct crypt_config *cc)
2607{
c82feeec
OK		 2608 int r;
2609
e48d4bbf 2610 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2611 get_random_bytes(&cc->key, cc->key_size);
4a52ffc7
MB		 2612
2613 /* Wipe IV private keys */
2614 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2615 r = cc->iv_gen_ops->wipe(cc);
2616 if (r)
2617 return r;
2618 }
2619
453431a5 2620 kfree_sensitive(cc->key_string);
c538f6ec 2621 cc->key_string = NULL;
c82feeec
OK		 2622 r = crypt_setkey(cc);
2623 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2624
c82feeec 2625 return r;
e48d4bbf
MB		 2626}
2627
5059353d
MP		 2628static void crypt_calculate_pages_per_client(void)
2629{
ca79b0c2 2630 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2631
2632 if (!dm_crypt_clients_n)
2633 return;
2634
2635 pages /= dm_crypt_clients_n;
2636 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2637 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2638 dm_crypt_pages_per_client = pages;
2639}
2640
2641static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2642{
2643 struct crypt_config *cc = pool_data;
2644 struct page *page;
2645
2646 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2647 likely(gfp_mask & __GFP_NORETRY))
2648 return NULL;
2649
2650 page = alloc_page(gfp_mask);
2651 if (likely(page != NULL))
2652 percpu_counter_add(&cc->n_allocated_pages, 1);
2653
2654 return page;
2655}
2656
2657static void crypt_page_free(void *page, void *pool_data)
2658{
2659 struct crypt_config *cc = pool_data;
2660
2661 __free_page(page);
2662 percpu_counter_sub(&cc->n_allocated_pages, 1);
2663}
2664
28513fcc
MB		 2665static void crypt_dtr(struct dm_target *ti)
2666{
2667 struct crypt_config *cc = ti->private;
2668
2669 ti->private = NULL;
2670
2671 if (!cc)
2672 return;
2673
f659b100 2674 if (cc->write_thread)
dc267621
MP		 2675 kthread_stop(cc->write_thread);
2676
28513fcc
MB		 2677 if (cc->io_queue)
2678 destroy_workqueue(cc->io_queue);
2679 if (cc->crypt_queue)
2680 destroy_workqueue(cc->crypt_queue);
2681
fd2d231f
MP		 2682 crypt_free_tfms(cc);
2683
6f1c819c 2684 bioset_exit(&cc->bs);
28513fcc 2685
6f1c819c
KO		 2686 mempool_exit(&cc->page_pool);
2687 mempool_exit(&cc->req_pool);
2688 mempool_exit(&cc->tag_pool);
2689
d00a11df
KO		 2690 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2691 percpu_counter_destroy(&cc->n_allocated_pages);
2692
28513fcc
MB		 2693 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2694 cc->iv_gen_ops->dtr(cc);
2695
28513fcc
MB		 2696 if (cc->dev)
2697 dm_put_device(ti, cc->dev);
2698
453431a5
WL		 2699 kfree_sensitive(cc->cipher_string);
2700 kfree_sensitive(cc->key_string);
2701 kfree_sensitive(cc->cipher_auth);
2702 kfree_sensitive(cc->authenc_key);
28513fcc 2703
d5ffebdd
MS		 2704 mutex_destroy(&cc->bio_alloc_lock);
2705
28513fcc 2706 /* Must zero key material before freeing */
453431a5 2707 kfree_sensitive(cc);
5059353d
MP		 2708
2709 spin_lock(&dm_crypt_clients_lock);
2710 WARN_ON(!dm_crypt_clients_n);
2711 dm_crypt_clients_n--;
2712 crypt_calculate_pages_per_client();
2713 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2714}
2715
e889f97a
MB		 2716static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2717{
2718 struct crypt_config *cc = ti->private;
2719
33d2f09f 2720 if (crypt_integrity_aead(cc))
e889f97a
MB		 2721 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2722 else
2723 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2724
e889f97a
MB		 2725 if (cc->iv_size)
2726 /* at least a 64 bit sector number should fit in our buffer */
2727 cc->iv_size = max(cc->iv_size,
2728 (unsigned int)(sizeof(u64) / sizeof(u8)));
2729 else if (ivmode) {
2730 DMWARN("Selected cipher does not support IVs");
2731 ivmode = NULL;
2732 }
2733
2734 /* Choose ivmode, see comments at iv code. */
2735 if (ivmode == NULL)
2736 cc->iv_gen_ops = NULL;
2737 else if (strcmp(ivmode, "plain") == 0)
2738 cc->iv_gen_ops = &crypt_iv_plain_ops;
2739 else if (strcmp(ivmode, "plain64") == 0)
2740 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2741 else if (strcmp(ivmode, "plain64be") == 0)
2742 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2743 else if (strcmp(ivmode, "essiv") == 0)
2744 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2745 else if (strcmp(ivmode, "benbi") == 0)
2746 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2747 else if (strcmp(ivmode, "null") == 0)
2748 cc->iv_gen_ops = &crypt_iv_null_ops;
b9411d73
MB		 2749 else if (strcmp(ivmode, "eboiv") == 0)
2750 cc->iv_gen_ops = &crypt_iv_eboiv_ops;
bbb16584
MB		 2751 else if (strcmp(ivmode, "elephant") == 0) {
2752 cc->iv_gen_ops = &crypt_iv_elephant_ops;
2753 cc->key_parts = 2;
2754 cc->key_extra_size = cc->key_size / 2;
2755 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE)
2756 return -EINVAL;
2757 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags);
2758 } else if (strcmp(ivmode, "lmk") == 0) {
e889f97a
MB		 2759 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2760 /*
2761 * Version 2 and 3 is recognised according
2762 * to length of provided multi-key string.
2763 * If present (version 3), last key is used as IV seed.
2764 * All keys (including IV seed) are always the same size.
2765 */
2766 if (cc->key_size % cc->key_parts) {
2767 cc->key_parts++;
2768 cc->key_extra_size = cc->key_size / cc->key_parts;
2769 }
2770 } else if (strcmp(ivmode, "tcw") == 0) {
2771 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2772 cc->key_parts += 2; /* IV + whitening */
2773 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2774 } else if (strcmp(ivmode, "random") == 0) {
2775 cc->iv_gen_ops = &crypt_iv_random_ops;
2776 /* Need storage space in integrity fields. */
2777 cc->integrity_iv_size = cc->iv_size;
2778 } else {
2779 ti->error = "Invalid IV mode";
2780 return -EINVAL;
2781 }
2782
2783 return 0;
2784}
2785
33d2f09f
MB		 2786/*
2787 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2788 * The HMAC is needed to calculate tag size (HMAC digest size).
2789 * This should be probably done by crypto-api calls (once available...)
2790 */
2791static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2792{
2793 char *start, *end, *mac_alg = NULL;
2794 struct crypto_ahash *mac;
2795
2796 if (!strstarts(cipher_api, "authenc("))
2797 return 0;
2798
2799 start = strchr(cipher_api, '(');
2800 end = strchr(cipher_api, ',');
2801 if (!start || !end || ++start > end)
2802 return -EINVAL;
2803
2804 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2805 if (!mac_alg)
2806 return -ENOMEM;
2807 strncpy(mac_alg, start, end - start);
2808
cd746938 2809 mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
33d2f09f
MB		 2810 kfree(mac_alg);
2811
2812 if (IS_ERR(mac))
2813 return PTR_ERR(mac);
2814
2815 cc->key_mac_size = crypto_ahash_digestsize(mac);
2816 crypto_free_ahash(mac);
2817
2818 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2819 if (!cc->authenc_key)
2820 return -ENOMEM;
2821
2822 return 0;
2823}
2824
2825static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2826 char **ivmode, char **ivopts)
2827{
2828 struct crypt_config *cc = ti->private;
a1a262b6 2829 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME];
33d2f09f
MB		 2830 int ret = -EINVAL;
2831
2832 cc->tfms_count = 1;
2833
2834 /*
2835 * New format (capi: prefix)
2836 * capi:cipher_api_spec-iv:ivopts
2837 */
2838 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2839
2840 /* Separate IV options if present, it can contain another '-' in hash name */
2841 *ivopts = strrchr(tmp, ':');
2842 if (*ivopts) {
2843 **ivopts = '\0';
2844 (*ivopts)++;
2845 }
2846 /* Parse IV mode */
2847 *ivmode = strrchr(tmp, '-');
2848 if (*ivmode) {
2849 **ivmode = '\0';
2850 (*ivmode)++;
2851 }
2852 /* The rest is crypto API spec */
2853 cipher_api = tmp;
33d2f09f 2854
a1a262b6
AB		 2855 /* Alloc AEAD, can be used only in new format. */
2856 if (crypt_integrity_aead(cc)) {
2857 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2858 if (ret < 0) {
2859 ti->error = "Invalid AEAD cipher spec";
2860 return -ENOMEM;
2861 }
2862 }
2863
33d2f09f
MB		 2864 if (*ivmode && !strcmp(*ivmode, "lmk"))
2865 cc->tfms_count = 64;
2866
a1a262b6
AB		 2867 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2868 if (!*ivopts) {
2869 ti->error = "Digest algorithm missing for ESSIV mode";
2870 return -EINVAL;
2871 }
2872 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)",
2873 cipher_api, *ivopts);
2874 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
2875 ti->error = "Cannot allocate cipher string";
2876 return -ENOMEM;
2877 }
2878 cipher_api = buf;
2879 }
2880
33d2f09f
MB		 2881 cc->key_parts = cc->tfms_count;
2882
2883 /* Allocate cipher */
2884 ret = crypt_alloc_tfms(cc, cipher_api);
2885 if (ret < 0) {
2886 ti->error = "Error allocating crypto tfm";
2887 return ret;
2888 }
2889
a1a262b6 2890 if (crypt_integrity_aead(cc))
33d2f09f 2891 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
a1a262b6 2892 else
33d2f09f
MB		 2893 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2894
33d2f09f
MB		 2895 return 0;
2896}
2897
2898static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2899 char **ivmode, char **ivopts)
1da177e4 2900{
5ebaee6d 2901 struct crypt_config *cc = ti->private;
33d2f09f 2902 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2903 char *cipher_api = NULL;
fd2d231f 2904 int ret = -EINVAL;
31998ef1 2905 char dummy;
1da177e4 2906
33d2f09f 2907 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2908 ti->error = "Bad cipher specification";
1da177e4
LT		 2909 return -EINVAL;
2910 }
2911
5ebaee6d
MB		 2912 /*
2913 * Legacy dm-crypt cipher specification
d1f96423 2914 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2915 */
2916 tmp = cipher_in;
d1f96423
MB		 2917 keycount = strsep(&tmp, "-");
2918 cipher = strsep(&keycount, ":");
2919
2920 if (!keycount)
2921 cc->tfms_count = 1;
31998ef1 2922 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2923 !is_power_of_2(cc->tfms_count)) {
2924 ti->error = "Bad cipher key count specification";
2925 return -EINVAL;
2926 }
2927 cc->key_parts = cc->tfms_count;
5ebaee6d 2928
1da177e4 2929 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 2930 *ivmode = strsep(&tmp, ":");
2931 *ivopts = tmp;
1da177e4 2932
7dbcd137
MB		 2933 /*
2934 * For compatibility with the original dm-crypt mapping format, if
2935 * only the cipher name is supplied, use cbc-plain.
2936 */
33d2f09f 2937 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2938 chainmode = "cbc";
33d2f09f 2939 *ivmode = "plain";
1da177e4
LT		 2940 }
2941
33d2f09f 2942 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2943 ti->error = "IV mechanism required";
2944 return -EINVAL;
1da177e4
LT		 2945 }
2946
5ebaee6d
MB		 2947 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2948 if (!cipher_api)
2949 goto bad_mem;
2950
a1a262b6
AB		 2951 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2952 if (!*ivopts) {
2953 ti->error = "Digest algorithm missing for ESSIV mode";
2954 kfree(cipher_api);
2955 return -EINVAL;
2956 }
2957 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2958 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts);
2959 } else {
2960 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2961 "%s(%s)", chainmode, cipher);
2962 }
2963 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
5ebaee6d
MB		 2964 kfree(cipher_api);
2965 goto bad_mem;
1da177e4
LT		 2966 }
2967
5ebaee6d 2968 /* Allocate cipher */
fd2d231f
MP		 2969 ret = crypt_alloc_tfms(cc, cipher_api);
2970 if (ret < 0) {
2971 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2972 kfree(cipher_api);
2973 return ret;
1da177e4 2974 }
bd86e320 2975 kfree(cipher_api);
1da177e4 2976
33d2f09f
MB		 2977 return 0;
2978bad_mem:
2979 ti->error = "Cannot allocate cipher strings";
2980 return -ENOMEM;
2981}
5ebaee6d 2982
33d2f09f
MB		 2983static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2984{
2985 struct crypt_config *cc = ti->private;
2986 char *ivmode = NULL, *ivopts = NULL;
2987 int ret;
2988
2989 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2990 if (!cc->cipher_string) {
2991 ti->error = "Cannot allocate cipher strings";
2992 return -ENOMEM;
1da177e4
LT		 2993 }
2994
33d2f09f
MB		 2995 if (strstarts(cipher_in, "capi:"))
2996 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2997 else
2998 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2999 if (ret)
3000 return ret;
3001
5ebaee6d 3002 /* Initialize IV */
e889f97a
MB		 3003 ret = crypt_ctr_ivmode(ti, ivmode);
3004 if (ret < 0)
33d2f09f 3005 return ret;
1da177e4 3006
da31a078
MB		 3007 /* Initialize and set key */
3008 ret = crypt_set_key(cc, key);
3009 if (ret < 0) {
3010 ti->error = "Error decoding and setting key";
33d2f09f 3011 return ret;
da31a078
MB		 3012 }
3013
28513fcc
MB		 3014 /* Allocate IV */
3015 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
3016 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
3017 if (ret < 0) {
3018 ti->error = "Error creating IV";
33d2f09f 3019 return ret;
28513fcc
MB		 3020 }
3021 }
1da177e4 3022
28513fcc
MB		 3023 /* Initialize IV (set keys for ESSIV etc) */
3024 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
3025 ret = cc->iv_gen_ops->init(cc);
3026 if (ret < 0) {
3027 ti->error = "Error initialising IV";
33d2f09f 3028 return ret;
28513fcc 3029 }
b95bf2d3
MB		 3030 }
3031
dc94902b
OK		 3032 /* wipe the kernel key payload copy */
3033 if (cc->key_string)
3034 memset(cc->key, 0, cc->key_size * sizeof(u8));
3035
5ebaee6d 3036 return ret;
5ebaee6d 3037}
5ebaee6d 3038
ef43aa38
MB		 3039static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
3040{
3041 struct crypt_config *cc = ti->private;
3042 struct dm_arg_set as;
5916a22b 3043 static const struct dm_arg _args[] = {
39d42fa9 3044 {0, 8, "Invalid number of feature args"},
ef43aa38
MB		 3045 };
3046 unsigned int opt_params, val;
3047 const char *opt_string, *sval;
8f0009a2 3048 char dummy;
ef43aa38
MB		 3049 int ret;
3050
3051 /* Optional parameters */
3052 as.argc = argc;
3053 as.argv = argv;
3054
3055 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
3056 if (ret)
3057 return ret;
3058
3059 while (opt_params--) {
3060 opt_string = dm_shift_arg(&as);
3061 if (!opt_string) {
3062 ti->error = "Not enough feature arguments";
3063 return -EINVAL;
3064 }
3065
3066 if (!strcasecmp(opt_string, "allow_discards"))
3067 ti->num_discard_bios = 1;
3068
3069 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
3070 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
3071
3072 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
3073 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3074 else if (!strcasecmp(opt_string, "no_read_workqueue"))
3075 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3076 else if (!strcasecmp(opt_string, "no_write_workqueue"))
3077 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ef43aa38
MB		 3078 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
3079 if (val == 0 || val > MAX_TAG_SIZE) {
3080 ti->error = "Invalid integrity arguments";
3081 return -EINVAL;
3082 }
3083 cc->on_disk_tag_size = val;
3084 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
3085 if (!strcasecmp(sval, "aead")) {
3086 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 3087 } else if (strcasecmp(sval, "none")) {
3088 ti->error = "Unknown integrity profile";
3089 return -EINVAL;
3090 }
3091
3092 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
3093 if (!cc->cipher_auth)
3094 return -ENOMEM;
ff3af92b 3095 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 3096 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
3097 cc->sector_size > 4096 ||
ff3af92b 3098 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 3099 ti->error = "Invalid feature value for sector_size";
3100 return -EINVAL;
3101 }
783874b0
MB		 3102 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
3103 ti->error = "Device size is not multiple of sector_size feature";
3104 return -EINVAL;
3105 }
ff3af92b 3106 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 3107 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
3108 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
3109 else {
ef43aa38
MB		 3110 ti->error = "Invalid feature arguments";
3111 return -EINVAL;
3112 }
3113 }
3114
3115 return 0;
5ebaee6d
MB		 3116}
3117
8e225f04
DLM		 3118#ifdef CONFIG_BLK_DEV_ZONED
3119
3120static int crypt_report_zones(struct dm_target *ti,
3121 struct dm_report_zones_args *args, unsigned int nr_zones)
3122{
3123 struct crypt_config *cc = ti->private;
3124 sector_t sector = cc->start + dm_target_offset(ti, args->next_sector);
3125
3126 args->start = cc->start;
3127 return blkdev_report_zones(cc->dev->bdev, sector, nr_zones,
3128 dm_report_zones_cb, args);
3129}
3130
3131#endif
3132
5ebaee6d
MB		 3133/*
3134 * Construct an encryption mapping:
c538f6ec 3135 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 3136 */
3137static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
3138{
3139 struct crypt_config *cc;
ed0302e8 3140 const char *devname = dm_table_device_name(ti->table);
c538f6ec 3141 int key_size;
ef43aa38 3142 unsigned int align_mask;
5ebaee6d
MB		 3143 unsigned long long tmpll;
3144 int ret;
ef43aa38 3145 size_t iv_size_padding, additional_req_size;
31998ef1 3146 char dummy;
772ae5f5 3147
772ae5f5 3148 if (argc < 5) {
5ebaee6d
MB		 3149 ti->error = "Not enough arguments";
3150 return -EINVAL;
1da177e4
LT		 3151 }
3152
c538f6ec
OK		 3153 key_size = get_key_size(&argv[1]);
3154 if (key_size < 0) {
3155 ti->error = "Cannot parse key size";
3156 return -EINVAL;
3157 }
5ebaee6d 3158
9c81c99b 3159 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL);
5ebaee6d
MB		 3160 if (!cc) {
3161 ti->error = "Cannot allocate encryption context";
3162 return -ENOMEM;
3163 }
69a8cfcd 3164 cc->key_size = key_size;
8f0009a2 3165 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 3166 cc->sector_shift = 0;
5ebaee6d
MB		 3167
3168 ti->private = cc;
ef43aa38 3169
5059353d
MP		 3170 spin_lock(&dm_crypt_clients_lock);
3171 dm_crypt_clients_n++;
3172 crypt_calculate_pages_per_client();
3173 spin_unlock(&dm_crypt_clients_lock);
3174
3175 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
3176 if (ret < 0)
3177 goto bad;
3178
ef43aa38
MB		 3179 /* Optional parameters need to be read before cipher constructor */
3180 if (argc > 5) {
3181 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
3182 if (ret)
3183 goto bad;
3184 }
3185
5ebaee6d
MB		 3186 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
3187 if (ret < 0)
3188 goto bad;
3189
33d2f09f 3190 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 3191 cc->dmreq_start = sizeof(struct aead_request);
3192 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
3193 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
3194 } else {
3195 cc->dmreq_start = sizeof(struct skcipher_request);
3196 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
3197 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
3198 }
d49ec52f
MP		 3199 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
3200
ef43aa38 3201 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 3202 /* Allocate the padding exactly */
3203 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 3204 & align_mask;
d49ec52f
MP		 3205 } else {
3206 /*
3207 * If the cipher requires greater alignment than kmalloc
3208 * alignment, we don't know the exact position of the
3209 * initialization vector. We must assume worst case.
3210 */
ef43aa38 3211 iv_size_padding = align_mask;
d49ec52f 3212 }
ddd42edf 3213
ef43aa38
MB		 3214 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
3215 additional_req_size = sizeof(struct dm_crypt_request) +
3216 iv_size_padding + cc->iv_size +
3217 cc->iv_size +
3218 sizeof(uint64_t) +
3219 sizeof(unsigned int);
3220
6f1c819c
KO		 3221 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
3222 if (ret) {
ddd42edf 3223 ti->error = "Cannot allocate crypt request mempool";
28513fcc 3224 goto bad;
ddd42edf 3225 }
ddd42edf 3226
30187e1d 3227 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 3228 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 3229 ARCH_KMALLOC_MINALIGN);
298a9fa0 3230
6f1c819c
KO		 3231 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
3232 if (ret) {
72d94861 3233 ti->error = "Cannot allocate page mempool";
28513fcc 3234 goto bad;
1da177e4
LT		 3235 }
3236
6f1c819c
KO		 3237 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
3238 if (ret) {
6a24c718 3239 ti->error = "Cannot allocate crypt bioset";
28513fcc 3240 goto bad;
6a24c718
MB		 3241 }
3242
7145c241
MP		 3243 mutex_init(&cc->bio_alloc_lock);
3244
28513fcc 3245 ret = -EINVAL;
8f0009a2
MB		 3246 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
3247 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 3248 ti->error = "Invalid iv_offset sector";
28513fcc 3249 goto bad;
1da177e4 3250 }
4ee218cd 3251 cc->iv_offset = tmpll;
1da177e4 3252
e80d1c80
VG		 3253 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
3254 if (ret) {
28513fcc
MB		 3255 ti->error = "Device lookup failed";
3256 goto bad;
3257 }
3258
e80d1c80 3259 ret = -EINVAL;
ef87bfc2 3260 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 3261 ti->error = "Invalid device sector";
28513fcc 3262 goto bad;
1da177e4 3263 }
4ee218cd 3264 cc->start = tmpll;
1da177e4 3265
8e225f04
DLM		 3266 /*
3267 * For zoned block devices, we need to preserve the issuer write
3268 * ordering. To do so, disable write workqueues and force inline
3269 * encryption completion.
3270 */
3271 if (bdev_is_zoned(cc->dev->bdev)) {
3272 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
3273 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags);
3274 }
3275
33d2f09f 3276 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 3277 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 3278 if (ret)
3279 goto bad;
3280
ef43aa38
MB		 3281 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
3282 if (!cc->tag_pool_max_sectors)
3283 cc->tag_pool_max_sectors = 1;
f3396c58 3284
6f1c819c 3285 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 3286 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 3287 if (ret) {
ef43aa38
MB		 3288 ti->error = "Cannot allocate integrity tags mempool";
3289 goto bad;
772ae5f5 3290 }
583fe747
MP		 3291
3292 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 3293 }
3294
28513fcc 3295 ret = -ENOMEM;
f612b213 3296 cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
cabf08e4
MB		 3297 if (!cc->io_queue) {
3298 ti->error = "Couldn't create kcryptd io queue";
28513fcc 3299 goto bad;
cabf08e4
MB		 3300 }
3301
f3396c58 3302 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
48b0777c 3303 cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
ed0302e8 3304 1, devname);
f3396c58 3305 else
48b0777c
MS		 3306 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
3307 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 3308 num_online_cpus(), devname);
cabf08e4 3309 if (!cc->crypt_queue) {
9934a8be 3310 ti->error = "Couldn't create kcryptd queue";
28513fcc 3311 goto bad;
9934a8be
MB		 3312 }
3313
c7329eff 3314 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 3315 cc->write_tree = RB_ROOT;
dc267621 3316
ed0302e8 3317 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 3318 if (IS_ERR(cc->write_thread)) {
3319 ret = PTR_ERR(cc->write_thread);
3320 cc->write_thread = NULL;
3321 ti->error = "Couldn't spawn write thread";
3322 goto bad;
3323 }
3324 wake_up_process(cc->write_thread);
3325
55a62eef 3326 ti->num_flush_bios = 1;
bffdde6f 3327 ti->limit_swap_bios = true;
983c7db3 3328
1da177e4
LT		 3329 return 0;
3330
28513fcc
MB		 3331bad:
3332 crypt_dtr(ti);
3333 return ret;
1da177e4
LT		 3334}
3335
7de3ee57 3336static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 3337{
028867ac 3338 struct dm_crypt_io *io;
49a8a920 3339 struct crypt_config *cc = ti->private;
647c7db1 3340
772ae5f5 3341 /*
28a8f0d3
MC		 3342 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
3343 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 3344 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 3345 */
1eff9d32 3346 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 3347 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 3348 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 3349 if (bio_sectors(bio))
4f024f37
KO		 3350 bio->bi_iter.bi_sector = cc->start +
3351 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 3352 return DM_MAPIO_REMAPPED;
3353 }
1da177e4 3354
4e870e94
MP		 3355 /*
3356 * Check if bio is too large, split as needed.
3357 */
3358 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 3359 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 3360 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
3361
8f0009a2
MB		 3362 /*
3363 * Ensure that bio is a multiple of internal sector encryption size
3364 * and is aligned to this size as defined in IO hints.
3365 */
3366 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 3367 return DM_MAPIO_KILL;
8f0009a2
MB		 3368
3369 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 3370 return DM_MAPIO_KILL;
8f0009a2 3371
298a9fa0
MP		 3372 io = dm_per_bio_data(bio, cc->per_bio_data_size);
3373 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 3374
3375 if (cc->on_disk_tag_size) {
583fe747 3376 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 3377
3378 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 3379 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 3380 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
3381 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
3382 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 3383 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 3384 io->integrity_metadata_from_pool = true;
3385 }
3386 }
3387
33d2f09f 3388 if (crypt_integrity_aead(cc))
ef43aa38
MB		 3389 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
3390 else
3391 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 3392
20c82538
MB		 3393 if (bio_data_dir(io->base_bio) == READ) {
3394 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 3395 kcryptd_queue_read(io);
20c82538 3396 } else
cabf08e4 3397 kcryptd_queue_crypt(io);
1da177e4 3398
d2a7ad29 3399 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 3400}
3401
fd7c092e
MP		 3402static void crypt_status(struct dm_target *ti, status_type_t type,
3403 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 3404{
5ebaee6d 3405 struct crypt_config *cc = ti->private;
fd7c092e 3406 unsigned i, sz = 0;
f3396c58 3407 int num_feature_args = 0;
1da177e4
LT		 3408
3409 switch (type) {
3410 case STATUSTYPE_INFO:
3411 result[0] = '\0';
3412 break;
3413
3414 case STATUSTYPE_TABLE:
7dbcd137 3415 DMEMIT("%s ", cc->cipher_string);
1da177e4 3416
c538f6ec
OK		 3417 if (cc->key_size > 0) {
3418 if (cc->key_string)
3419 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
3420 else
3421 for (i = 0; i < cc->key_size; i++)
3422 DMEMIT("%02x", cc->key[i]);
3423 } else
fd7c092e 3424 DMEMIT("-");
1da177e4 3425
4ee218cd
AM		 3426 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
3427 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 3428
f3396c58
MP		 3429 num_feature_args += !!ti->num_discard_bios;
3430 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 3431 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3432 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3433 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ff3af92b 3434 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 3435 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 3436 if (cc->on_disk_tag_size)
3437 num_feature_args++;
f3396c58
MP		 3438 if (num_feature_args) {
3439 DMEMIT(" %d", num_feature_args);
3440 if (ti->num_discard_bios)
3441 DMEMIT(" allow_discards");
3442 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
3443 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 3444 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
3445 DMEMIT(" submit_from_crypt_cpus");
39d42fa9
IK		 3446 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags))
3447 DMEMIT(" no_read_workqueue");
3448 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))
3449 DMEMIT(" no_write_workqueue");
ef43aa38
MB		 3450 if (cc->on_disk_tag_size)
3451 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 3452 if (cc->sector_size != (1 << SECTOR_SHIFT))
3453 DMEMIT(" sector_size:%d", cc->sector_size);
3454 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
3455 DMEMIT(" iv_large_sectors");
f3396c58 3456 }
772ae5f5 3457
1da177e4
LT		 3458 break;
3459 }
1da177e4
LT		 3460}
3461
e48d4bbf
MB		 3462static void crypt_postsuspend(struct dm_target *ti)
3463{
3464 struct crypt_config *cc = ti->private;
3465
3466 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3467}
3468
3469static int crypt_preresume(struct dm_target *ti)
3470{
3471 struct crypt_config *cc = ti->private;
3472
3473 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3474 DMERR("aborting resume - crypt key is not set.");
3475 return -EAGAIN;
3476 }
3477
3478 return 0;
3479}
3480
3481static void crypt_resume(struct dm_target *ti)
3482{
3483 struct crypt_config *cc = ti->private;
3484
3485 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3486}
3487
3488/* Message interface
3489 * key set <key>
3490 * key wipe
3491 */
1eb5fa84
MS		 3492static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3493 char *result, unsigned maxlen)
e48d4bbf
MB		 3494{
3495 struct crypt_config *cc = ti->private;
c538f6ec 3496 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3497
3498 if (argc < 2)
3499 goto error;
3500
498f0103 3501 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3502 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3503 DMWARN("not suspended during key manipulation.");
3504 return -EINVAL;
3505 }
498f0103 3506 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3507 /* The key size may not be changed. */
3508 key_size = get_key_size(&argv[2]);
3509 if (key_size < 0 || cc->key_size != key_size) {
3510 memset(argv[2], '0', strlen(argv[2]));
3511 return -EINVAL;
3512 }
3513
542da317
MB		 3514 ret = crypt_set_key(cc, argv[2]);
3515 if (ret)
3516 return ret;
3517 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3518 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3519 /* wipe the kernel key payload copy */
3520 if (cc->key_string)
3521 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3522 return ret;
3523 }
4a52ffc7 3524 if (argc == 2 && !strcasecmp(argv[1], "wipe"))
e48d4bbf
MB		 3525 return crypt_wipe_key(cc);
3526 }
3527
3528error:
3529 DMWARN("unrecognised message received.");
3530 return -EINVAL;
3531}
3532
af4874e0
MS		 3533static int crypt_iterate_devices(struct dm_target *ti,
3534 iterate_devices_callout_fn fn, void *data)
3535{
3536 struct crypt_config *cc = ti->private;
3537
5dea271b 3538 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3539}
3540
586b286b
MS		 3541static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3542{
8f0009a2
MB		 3543 struct crypt_config *cc = ti->private;
3544
586b286b
MS		 3545 /*
3546 * Unfortunate constraint that is required to avoid the potential
3547 * for exceeding underlying device's max_segments limits -- due to
3548 * crypt_alloc_buffer() possibly allocating pages for the encryption
3549 * bio that are not as physically contiguous as the original bio.
3550 */
3551 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3552
bc9e9cf0 3553 limits->logical_block_size =
64611a15 3554 max_t(unsigned, limits->logical_block_size, cc->sector_size);
bc9e9cf0
MP		 3555 limits->physical_block_size =
3556 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3557 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3558}
3559
1da177e4
LT		 3560static struct target_type crypt_target = {
3561 .name = "crypt",
39d42fa9 3562 .version = {1, 22, 0},
1da177e4
LT		 3563 .module = THIS_MODULE,
3564 .ctr = crypt_ctr,
3565 .dtr = crypt_dtr,
8e225f04
DLM		 3566#ifdef CONFIG_BLK_DEV_ZONED
3567 .features = DM_TARGET_ZONED_HM,
3568 .report_zones = crypt_report_zones,
3569#endif
1da177e4
LT		 3570 .map = crypt_map,
3571 .status = crypt_status,
e48d4bbf
MB		 3572 .postsuspend = crypt_postsuspend,
3573 .preresume = crypt_preresume,
3574 .resume = crypt_resume,
3575 .message = crypt_message,
af4874e0 3576 .iterate_devices = crypt_iterate_devices,
586b286b 3577 .io_hints = crypt_io_hints,
1da177e4
LT		 3578};
3579
3580static int __init dm_crypt_init(void)
3581{
3582 int r;
3583
1da177e4 3584 r = dm_register_target(&crypt_target);
94f5e024 3585 if (r < 0)
72d94861 3586 DMERR("register failed %d", r);
1da177e4 3587
1da177e4
LT		 3588 return r;
3589}
3590
3591static void __exit dm_crypt_exit(void)
3592{
10d3bd09 3593 dm_unregister_target(&crypt_target);
1da177e4
LT		 3594}
3595
3596module_init(dm_crypt_init);
3597module_exit(dm_crypt_exit);
3598
bf14299f 3599MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3600MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3601MODULE_LICENSE("GPL");
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