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dm crypt: use GFP_ATOMIC when allocating crypto requests from softirq
[linux-2.6-block.git] / drivers / md / dm-crypt.c
CommitLineData
1da177e4 1/*
bf14299f 2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
1da177e4 3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
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{
d68b2958
IK		 1484 if (!ctx->r.req) {
1485 ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
1486 if (!ctx->r.req)
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
1da177e4
LT		 1733/*
1734 * One of the bios was finished. Check for completion of
1735 * the whole request and correctly clean up the buffer.
1736 */
5742fd77 1737static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1738{
49a8a920 1739 struct crypt_config *cc = io->cc;
b35f8caa 1740 struct bio *base_bio = io->base_bio;
4e4cbee9 1741 blk_status_t error = io->error;
1da177e4 1742
40b6229b 1743 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1744 return;
1745
ef43aa38
MB		 1746 if (io->ctx.r.req)
1747 crypt_free_req(cc, io->ctx.r.req, base_bio);
1748
1749 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1750 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1751 else
1752 kfree(io->integrity_metadata);
b35f8caa 1753
4e4cbee9 1754 base_bio->bi_status = error;
4246a0b6 1755 bio_endio(base_bio);
1da177e4
LT		 1756}
1757
1758/*
cabf08e4 1759 * kcryptd/kcryptd_io:
1da177e4
LT		 1760 *
1761 * Needed because it would be very unwise to do decryption in an
23541d2d 1762 * interrupt context.
cabf08e4
MB		 1763 *
1764 * kcryptd performs the actual encryption or decryption.
1765 *
1766 * kcryptd_io performs the IO submission.
1767 *
1768 * They must be separated as otherwise the final stages could be
1769 * starved by new requests which can block in the first stages due
1770 * to memory allocation.
c0297721
AK		 1771 *
1772 * The work is done per CPU global for all dm-crypt instances.
1773 * They should not depend on each other and do not block.
1da177e4 1774 */
4246a0b6 1775static void crypt_endio(struct bio *clone)
8b004457 1776{
028867ac 1777 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1778 struct crypt_config *cc = io->cc;
ee7a491e 1779 unsigned rw = bio_data_dir(clone);
4e4cbee9 1780 blk_status_t error;
8b004457
MB		 1781
1782 /*
6712ecf8 1783 * free the processed pages
8b004457 1784 */
ee7a491e 1785 if (rw == WRITE)
644bd2f0 1786 crypt_free_buffer_pages(cc, clone);
8b004457 1787
4e4cbee9 1788 error = clone->bi_status;
8b004457 1789 bio_put(clone);
8b004457 1790
9b81c842 1791 if (rw == READ && !error) {
ee7a491e
MB		 1792 kcryptd_queue_crypt(io);
1793 return;
1794 }
5742fd77 1795
9b81c842
SL		 1796 if (unlikely(error))
1797 io->error = error;
5742fd77
MB		 1798
1799 crypt_dec_pending(io);
8b004457
MB		 1800}
1801
028867ac 1802static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1803{
49a8a920 1804 struct crypt_config *cc = io->cc;
8b004457
MB		 1805
1806 clone->bi_private = io;
1807 clone->bi_end_io = crypt_endio;
74d46992 1808 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1809 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1810}
1811
20c82538 1812static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1813{
49a8a920 1814 struct crypt_config *cc = io->cc;
8b004457 1815 struct bio *clone;
93e605c2 1816
8b004457 1817 /*
59779079
MS		 1818 * We need the original biovec array in order to decrypt
1819 * the whole bio data *afterwards* -- thanks to immutable
1820 * biovecs we don't need to worry about the block layer
1821 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1822 */
6f1c819c 1823 clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
7eaceacc 1824 if (!clone)
20c82538 1825 return 1;
8b004457 1826
20c82538
MB		 1827 crypt_inc_pending(io);
1828
8b004457 1829 clone_init(io, clone);
4f024f37 1830 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1831
ef43aa38
MB		 1832 if (dm_crypt_integrity_io_alloc(io, clone)) {
1833 crypt_dec_pending(io);
1834 bio_put(clone);
1835 return 1;
1836 }
1837
ed00aabd 1838 submit_bio_noacct(clone);
20c82538 1839 return 0;
8b004457
MB		 1840}
1841
dc267621
MP		 1842static void kcryptd_io_read_work(struct work_struct *work)
1843{
1844 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1845
1846 crypt_inc_pending(io);
1847 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1848 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1849 crypt_dec_pending(io);
1850}
1851
1852static void kcryptd_queue_read(struct dm_crypt_io *io)
1853{
1854 struct crypt_config *cc = io->cc;
1855
1856 INIT_WORK(&io->work, kcryptd_io_read_work);
1857 queue_work(cc->io_queue, &io->work);
1858}
1859
4e4eef64
MB		 1860static void kcryptd_io_write(struct dm_crypt_io *io)
1861{
95497a96 1862 struct bio *clone = io->ctx.bio_out;
dc267621 1863
ed00aabd 1864 submit_bio_noacct(clone);
4e4eef64
MB		 1865}
1866
b3c5fd30
MP		 1867#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1868
dc267621 1869static int dmcrypt_write(void *data)
395b167c 1870{
dc267621 1871 struct crypt_config *cc = data;
b3c5fd30
MP		 1872 struct dm_crypt_io *io;
1873
dc267621 1874 while (1) {
b3c5fd30 1875 struct rb_root write_tree;
dc267621 1876 struct blk_plug plug;
395b167c 1877
c7329eff 1878 spin_lock_irq(&cc->write_thread_lock);
dc267621 1879continue_locked:
395b167c 1880
b3c5fd30 1881 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1882 goto pop_from_list;
1883
f659b100 1884 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1885
c7329eff 1886 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1887
f659b100 1888 if (unlikely(kthread_should_stop())) {
642fa448 1889 set_current_state(TASK_RUNNING);
f659b100
RV		 1890 break;
1891 }
1892
dc267621
MP		 1893 schedule();
1894
642fa448 1895 set_current_state(TASK_RUNNING);
c7329eff 1896 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1897 goto continue_locked;
1898
1899pop_from_list:
b3c5fd30
MP		 1900 write_tree = cc->write_tree;
1901 cc->write_tree = RB_ROOT;
c7329eff 1902 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1903
b3c5fd30
MP		 1904 BUG_ON(rb_parent(write_tree.rb_node));
1905
1906 /*
1907 * Note: we cannot walk the tree here with rb_next because
1908 * the structures may be freed when kcryptd_io_write is called.
1909 */
dc267621
MP		 1910 blk_start_plug(&plug);
1911 do {
b3c5fd30
MP		 1912 io = crypt_io_from_node(rb_first(&write_tree));
1913 rb_erase(&io->rb_node, &write_tree);
dc267621 1914 kcryptd_io_write(io);
b3c5fd30 1915 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1916 blk_finish_plug(&plug);
1917 }
1918 return 0;
395b167c
AK		 1919}
1920
72c6e7af 1921static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1922{
dec1cedf 1923 struct bio *clone = io->ctx.bio_out;
49a8a920 1924 struct crypt_config *cc = io->cc;
dc267621 1925 unsigned long flags;
b3c5fd30
MP		 1926 sector_t sector;
1927 struct rb_node **rbp, *parent;
dec1cedf 1928
4e4cbee9 1929 if (unlikely(io->error)) {
dec1cedf
MB		 1930 crypt_free_buffer_pages(cc, clone);
1931 bio_put(clone);
6c031f41 1932 crypt_dec_pending(io);
dec1cedf
MB		 1933 return;
1934 }
1935
1936 /* crypt_convert should have filled the clone bio */
003b5c57 1937 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1938
4f024f37 1939 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1940
39d42fa9
IK		 1941 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) ||
1942 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) {
ed00aabd 1943 submit_bio_noacct(clone);
0f5d8e6e
MP		 1944 return;
1945 }
1946
c7329eff
MP		 1947 spin_lock_irqsave(&cc->write_thread_lock, flags);
1948 if (RB_EMPTY_ROOT(&cc->write_tree))
1949 wake_up_process(cc->write_thread);
b3c5fd30
MP		 1950 rbp = &cc->write_tree.rb_node;
1951 parent = NULL;
1952 sector = io->sector;
1953 while (*rbp) {
1954 parent = *rbp;
1955 if (sector < crypt_io_from_node(parent)->sector)
1956 rbp = &(*rbp)->rb_left;
1957 else
1958 rbp = &(*rbp)->rb_right;
1959 }
1960 rb_link_node(&io->rb_node, parent, rbp);
1961 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 1962 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 1963}
1964
8e225f04
DLM		 1965static bool kcryptd_crypt_write_inline(struct crypt_config *cc,
1966 struct convert_context *ctx)
1967
1968{
1969 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags))
1970 return false;
1971
1972 /*
1973 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering
1974 * constraints so they do not need to be issued inline by
1975 * kcryptd_crypt_write_convert().
1976 */
1977 switch (bio_op(ctx->bio_in)) {
1978 case REQ_OP_WRITE:
1979 case REQ_OP_WRITE_SAME:
1980 case REQ_OP_WRITE_ZEROES:
1981 return true;
1982 default:
1983 return false;
1984 }
1985}
1986
8abec36d
IK		 1987static void kcryptd_crypt_write_continue(struct work_struct *work)
1988{
1989 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1990 struct crypt_config *cc = io->cc;
1991 struct convert_context *ctx = &io->ctx;
1992 int crypt_finished;
1993 sector_t sector = io->sector;
1994 blk_status_t r;
1995
1996 wait_for_completion(&ctx->restart);
1997 reinit_completion(&ctx->restart);
1998
1999 r = crypt_convert(cc, &io->ctx, true, false);
2000 if (r)
2001 io->error = r;
2002 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2003 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2004 /* Wait for completion signaled by kcryptd_async_done() */
2005 wait_for_completion(&ctx->restart);
2006 crypt_finished = 1;
2007 }
2008
2009 /* Encryption was already finished, submit io now */
2010 if (crypt_finished) {
2011 kcryptd_crypt_write_io_submit(io, 0);
2012 io->sector = sector;
2013 }
2014
2015 crypt_dec_pending(io);
2016}
2017
fc5a5e9a 2018static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 2019{
49a8a920 2020 struct crypt_config *cc = io->cc;
8e225f04 2021 struct convert_context *ctx = &io->ctx;
8b004457 2022 struct bio *clone;
c8081618 2023 int crypt_finished;
b635b00e 2024 sector_t sector = io->sector;
4e4cbee9 2025 blk_status_t r;
8b004457 2026
fc5a5e9a
MB		 2027 /*
2028 * Prevent io from disappearing until this function completes.
2029 */
2030 crypt_inc_pending(io);
8e225f04 2031 crypt_convert_init(cc, ctx, NULL, io->base_bio, sector);
fc5a5e9a 2032
cf2f1abf
MP		 2033 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
2034 if (unlikely(!clone)) {
4e4cbee9 2035 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 2036 goto dec;
2037 }
c8081618 2038
cf2f1abf
MP		 2039 io->ctx.bio_out = clone;
2040 io->ctx.iter_out = clone->bi_iter;
b635b00e 2041
cf2f1abf 2042 sector += bio_sectors(clone);
93e605c2 2043
cf2f1abf 2044 crypt_inc_pending(io);
8e225f04 2045 r = crypt_convert(cc, ctx,
8abec36d
IK		 2046 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true);
2047 /*
2048 * Crypto API backlogged the request, because its queue was full
2049 * and we're in softirq context, so continue from a workqueue
2050 * (TODO: is it actually possible to be in softirq in the write path?)
2051 */
2052 if (r == BLK_STS_DEV_RESOURCE) {
2053 INIT_WORK(&io->work, kcryptd_crypt_write_continue);
2054 queue_work(cc->crypt_queue, &io->work);
2055 return;
2056 }
4e4cbee9 2057 if (r)
ef43aa38 2058 io->error = r;
8e225f04
DLM		 2059 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
2060 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
2061 /* Wait for completion signaled by kcryptd_async_done() */
2062 wait_for_completion(&ctx->restart);
2063 crypt_finished = 1;
2064 }
933f01d4 2065
cf2f1abf
MP		 2066 /* Encryption was already finished, submit io now */
2067 if (crypt_finished) {
2068 kcryptd_crypt_write_io_submit(io, 0);
2069 io->sector = sector;
93e605c2 2070 }
899c95d3 2071
cf2f1abf 2072dec:
899c95d3 2073 crypt_dec_pending(io);
84131db6
MB		 2074}
2075
72c6e7af 2076static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 2077{
5742fd77
MB		 2078 crypt_dec_pending(io);
2079}
2080
8abec36d
IK		 2081static void kcryptd_crypt_read_continue(struct work_struct *work)
2082{
2083 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
2084 struct crypt_config *cc = io->cc;
2085 blk_status_t r;
2086
2087 wait_for_completion(&io->ctx.restart);
2088 reinit_completion(&io->ctx.restart);
2089
2090 r = crypt_convert(cc, &io->ctx, true, false);
2091 if (r)
2092 io->error = r;
2093
2094 if (atomic_dec_and_test(&io->ctx.cc_pending))
2095 kcryptd_crypt_read_done(io);
2096
2097 crypt_dec_pending(io);
2098}
2099
4e4eef64 2100static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 2101{
49a8a920 2102 struct crypt_config *cc = io->cc;
4e4cbee9 2103 blk_status_t r;
1da177e4 2104
3e1a8bdd 2105 crypt_inc_pending(io);
3a7f6c99 2106
53017030 2107 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 2108 io->sector);
1da177e4 2109
39d42fa9 2110 r = crypt_convert(cc, &io->ctx,
8abec36d
IK		 2111 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true);
2112 /*
2113 * Crypto API backlogged the request, because its queue was full
2114 * and we're in softirq context, so continue from a workqueue
2115 */
2116 if (r == BLK_STS_DEV_RESOURCE) {
2117 INIT_WORK(&io->work, kcryptd_crypt_read_continue);
2118 queue_work(cc->crypt_queue, &io->work);
2119 return;
2120 }
4e4cbee9 2121 if (r)
ef43aa38 2122 io->error = r;
5742fd77 2123
40b6229b 2124 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 2125 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 2126
2127 crypt_dec_pending(io);
1da177e4
LT		 2128}
2129
95497a96
MB		 2130static void kcryptd_async_done(struct crypto_async_request *async_req,
2131 int error)
2132{
b2174eeb
HY		 2133 struct dm_crypt_request *dmreq = async_req->data;
2134 struct convert_context *ctx = dmreq->ctx;
95497a96 2135 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 2136 struct crypt_config *cc = io->cc;
95497a96 2137
54cea3f6
MB		 2138 /*
2139 * A request from crypto driver backlog is going to be processed now,
2140 * finish the completion and continue in crypt_convert().
2141 * (Callback will be called for the second time for this request.)
2142 */
c0403ec0
RV		 2143 if (error == -EINPROGRESS) {
2144 complete(&ctx->restart);
95497a96 2145 return;
c0403ec0 2146 }
95497a96 2147
2dc5327d 2148 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 2149 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 2150
ef43aa38 2151 if (error == -EBADMSG) {
f710126c
MB		 2152 char b[BDEVNAME_SIZE];
2153 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 2154 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 2155 io->error = BLK_STS_PROTECTION;
ef43aa38 2156 } else if (error < 0)
4e4cbee9 2157 io->error = BLK_STS_IOERR;
72c6e7af 2158
298a9fa0 2159 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 2160
40b6229b 2161 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 2162 return;
95497a96 2163
8e225f04
DLM		 2164 /*
2165 * The request is fully completed: for inline writes, let
2166 * kcryptd_crypt_write_convert() do the IO submission.
2167 */
2168 if (bio_data_dir(io->base_bio) == READ) {
72c6e7af 2169 kcryptd_crypt_read_done(io);
8e225f04
DLM		 2170 return;
2171 }
2172
2173 if (kcryptd_crypt_write_inline(cc, ctx)) {
2174 complete(&ctx->restart);
2175 return;
2176 }
2177
2178 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 2179}
2180
395b167c 2181static void kcryptd_crypt(struct work_struct *work)
1da177e4 2182{
028867ac 2183 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 2184
cabf08e4 2185 if (bio_data_dir(io->base_bio) == READ)
395b167c 2186 kcryptd_crypt_read_convert(io);
4e4eef64 2187 else
395b167c 2188 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 2189}
2190
39d42fa9
IK		 2191static void kcryptd_crypt_tasklet(unsigned long work)
2192{
2193 kcryptd_crypt((struct work_struct *)work);
2194}
2195
395b167c 2196static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 2197{
49a8a920 2198 struct crypt_config *cc = io->cc;
cabf08e4 2199
39d42fa9
IK		 2200 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) ||
2201 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) {
2202 if (in_irq()) {
2203 /* Crypto API's "skcipher_walk_first() refuses to work in hard IRQ context */
2204 tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work);
2205 tasklet_schedule(&io->tasklet);
2206 return;
2207 }
2208
2209 kcryptd_crypt(&io->work);
2210 return;
2211 }
2212
395b167c
AK		 2213 INIT_WORK(&io->work, kcryptd_crypt);
2214 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 2215}
2216
ef43aa38 2217static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 2218{
ef43aa38
MB		 2219 if (!cc->cipher_tfm.tfms_aead)
2220 return;
1da177e4 2221
ef43aa38
MB		 2222 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2223 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
2224 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 2225 }
2226
ef43aa38
MB		 2227 kfree(cc->cipher_tfm.tfms_aead);
2228 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 2229}
2230
ef43aa38 2231static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 2232{
d1f96423
MB		 2233 unsigned i;
2234
ef43aa38 2235 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2236 return;
2237
d1f96423 2238 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 2239 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
2240 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
2241 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 2242 }
fd2d231f 2243
ef43aa38
MB		 2244 kfree(cc->cipher_tfm.tfms);
2245 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 2246}
2247
ef43aa38
MB		 2248static void crypt_free_tfms(struct crypt_config *cc)
2249{
33d2f09f 2250 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2251 crypt_free_tfms_aead(cc);
2252 else
2253 crypt_free_tfms_skcipher(cc);
2254}
2255
2256static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 2257{
d1f96423
MB		 2258 unsigned i;
2259 int err;
2260
6396bb22
KC		 2261 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
2262 sizeof(struct crypto_skcipher *),
2263 GFP_KERNEL);
ef43aa38 2264 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2265 return -ENOMEM;
2266
d1f96423 2267 for (i = 0; i < cc->tfms_count; i++) {
cd746938
MP		 2268 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0,
2269 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2270 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
2271 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 2272 crypt_free_tfms(cc);
d1f96423
MB		 2273 return err;
2274 }
2275 }
2276
af331eba
EB		 2277 /*
2278 * dm-crypt performance can vary greatly depending on which crypto
2279 * algorithm implementation is used. Help people debug performance
2280 * problems by logging the ->cra_driver_name.
2281 */
7a1cd723 2282 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2283 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 2284 return 0;
2285}
2286
ef43aa38
MB		 2287static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
2288{
ef43aa38
MB		 2289 int err;
2290
2291 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
2292 if (!cc->cipher_tfm.tfms)
2293 return -ENOMEM;
2294
cd746938
MP		 2295 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0,
2296 CRYPTO_ALG_ALLOCATES_MEMORY);
ef43aa38
MB		 2297 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2298 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
2299 crypt_free_tfms(cc);
2300 return err;
2301 }
2302
7a1cd723 2303 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2304 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 2305 return 0;
2306}
2307
2308static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
2309{
33d2f09f 2310 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2311 return crypt_alloc_tfms_aead(cc, ciphermode);
2312 else
2313 return crypt_alloc_tfms_skcipher(cc, ciphermode);
2314}
2315
2316static unsigned crypt_subkey_size(struct crypt_config *cc)
2317{
2318 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
2319}
2320
2321static unsigned crypt_authenckey_size(struct crypt_config *cc)
2322{
2323 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
2324}
2325
2326/*
2327 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
2328 * the key must be for some reason in special format.
2329 * This funcion converts cc->key to this special format.
2330 */
2331static void crypt_copy_authenckey(char *p, const void *key,
2332 unsigned enckeylen, unsigned authkeylen)
2333{
2334 struct crypto_authenc_key_param *param;
2335 struct rtattr *rta;
2336
2337 rta = (struct rtattr *)p;
2338 param = RTA_DATA(rta);
2339 param->enckeylen = cpu_to_be32(enckeylen);
2340 rta->rta_len = RTA_LENGTH(sizeof(*param));
2341 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
2342 p += RTA_SPACE(sizeof(*param));
2343 memcpy(p, key + enckeylen, authkeylen);
2344 p += authkeylen;
2345 memcpy(p, key, enckeylen);
2346}
2347
671ea6b4 2348static int crypt_setkey(struct crypt_config *cc)
c0297721 2349{
da31a078 2350 unsigned subkey_size;
fd2d231f
MP		 2351 int err = 0, i, r;
2352
da31a078 2353 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 2354 subkey_size = crypt_subkey_size(cc);
da31a078 2355
27c70036
MB		 2356 if (crypt_integrity_hmac(cc)) {
2357 if (subkey_size < cc->key_mac_size)
2358 return -EINVAL;
2359
ef43aa38
MB		 2360 crypt_copy_authenckey(cc->authenc_key, cc->key,
2361 subkey_size - cc->key_mac_size,
2362 cc->key_mac_size);
27c70036
MB		 2363 }
2364
fd2d231f 2365 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 2366 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 2367 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2368 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 2369 else if (crypt_integrity_aead(cc))
2370 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2371 cc->key + (i * subkey_size),
2372 subkey_size);
ef43aa38
MB		 2373 else
2374 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
2375 cc->key + (i * subkey_size),
2376 subkey_size);
fd2d231f
MP		 2377 if (r)
2378 err = r;
c0297721
AK		 2379 }
2380
ef43aa38
MB		 2381 if (crypt_integrity_hmac(cc))
2382 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
2383
c0297721
AK		 2384 return err;
2385}
2386
c538f6ec
OK		 2387#ifdef CONFIG_KEYS
2388
027c431c
OK		 2389static bool contains_whitespace(const char *str)
2390{
2391 while (*str)
2392 if (isspace(*str++))
2393 return true;
2394 return false;
2395}
2396
27f5411a
DB		 2397static int set_key_user(struct crypt_config *cc, struct key *key)
2398{
2399 const struct user_key_payload *ukp;
2400
2401 ukp = user_key_payload_locked(key);
2402 if (!ukp)
2403 return -EKEYREVOKED;
2404
2405 if (cc->key_size != ukp->datalen)
2406 return -EINVAL;
2407
2408 memcpy(cc->key, ukp->data, cc->key_size);
2409
2410 return 0;
2411}
2412
2413#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2414static int set_key_encrypted(struct crypt_config *cc, struct key *key)
2415{
2416 const struct encrypted_key_payload *ekp;
2417
2418 ekp = key->payload.data[0];
2419 if (!ekp)
2420 return -EKEYREVOKED;
2421
2422 if (cc->key_size != ekp->decrypted_datalen)
2423 return -EINVAL;
2424
2425 memcpy(cc->key, ekp->decrypted_data, cc->key_size);
2426
2427 return 0;
2428}
2429#endif /* CONFIG_ENCRYPTED_KEYS */
2430
c538f6ec
OK		 2431static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2432{
2433 char *new_key_string, *key_desc;
2434 int ret;
27f5411a 2435 struct key_type *type;
c538f6ec 2436 struct key *key;
27f5411a 2437 int (*set_key)(struct crypt_config *cc, struct key *key);
c538f6ec 2438
027c431c
OK		 2439 /*
2440 * Reject key_string with whitespace. dm core currently lacks code for
2441 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2442 */
2443 if (contains_whitespace(key_string)) {
2444 DMERR("whitespace chars not allowed in key string");
2445 return -EINVAL;
2446 }
2447
c538f6ec
OK		 2448 /* look for next ':' separating key_type from key_description */
2449 key_desc = strpbrk(key_string, ":");
2450 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2451 return -EINVAL;
2452
27f5411a
DB		 2453 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
2454 type = &key_type_logon;
2455 set_key = set_key_user;
2456 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
2457 type = &key_type_user;
2458 set_key = set_key_user;
2459#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2460 } else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
2461 type = &key_type_encrypted;
2462 set_key = set_key_encrypted;
2463#endif
2464 } else {
c538f6ec 2465 return -EINVAL;
27f5411a 2466 }
c538f6ec
OK		 2467
2468 new_key_string = kstrdup(key_string, GFP_KERNEL);
2469 if (!new_key_string)
2470 return -ENOMEM;
2471
27f5411a 2472 key = request_key(type, key_desc + 1, NULL);
c538f6ec 2473 if (IS_ERR(key)) {
453431a5 2474 kfree_sensitive(new_key_string);
c538f6ec
OK		 2475 return PTR_ERR(key);
2476 }
2477
f5b0cba8 2478 down_read(&key->sem);
c538f6ec 2479
27f5411a
DB		 2480 ret = set_key(cc, key);
2481 if (ret < 0) {
f5b0cba8 2482 up_read(&key->sem);
c538f6ec 2483 key_put(key);
453431a5 2484 kfree_sensitive(new_key_string);
27f5411a 2485 return ret;
c538f6ec
OK		 2486 }
2487
f5b0cba8 2488 up_read(&key->sem);
c538f6ec
OK		 2489 key_put(key);
2490
2491 /* clear the flag since following operations may invalidate previously valid key */
2492 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2493
2494 ret = crypt_setkey(cc);
2495
c538f6ec
OK		 2496 if (!ret) {
2497 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
453431a5 2498 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2499 cc->key_string = new_key_string;
2500 } else
453431a5 2501 kfree_sensitive(new_key_string);
c538f6ec
OK		 2502
2503 return ret;
2504}
2505
2506static int get_key_size(char **key_string)
2507{
2508 char *colon, dummy;
2509 int ret;
2510
2511 if (*key_string[0] != ':')
2512 return strlen(*key_string) >> 1;
2513
2514 /* look for next ':' in key string */
2515 colon = strpbrk(*key_string + 1, ":");
2516 if (!colon)
2517 return -EINVAL;
2518
2519 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2520 return -EINVAL;
2521
2522 *key_string = colon;
2523
2524 /* remaining key string should be :<logon|user>:<key_desc> */
2525
2526 return ret;
2527}
2528
2529#else
2530
2531static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2532{
2533 return -EINVAL;
2534}
2535
2536static int get_key_size(char **key_string)
2537{
2538 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2539}
2540
27f5411a 2541#endif /* CONFIG_KEYS */
c538f6ec 2542
e48d4bbf
MB		 2543static int crypt_set_key(struct crypt_config *cc, char *key)
2544{
de8be5ac
MB		 2545 int r = -EINVAL;
2546 int key_string_len = strlen(key);
2547
69a8cfcd
MB		 2548 /* Hyphen (which gives a key_size of zero) means there is no key. */
2549 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2550 goto out;
e48d4bbf 2551
c538f6ec
OK		 2552 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2553 if (key[0] == ':') {
2554 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2555 goto out;
c538f6ec 2556 }
e48d4bbf 2557
265e9098
OK		 2558 /* clear the flag since following operations may invalidate previously valid key */
2559 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2560
c538f6ec 2561 /* wipe references to any kernel keyring key */
453431a5 2562 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2563 cc->key_string = NULL;
2564
e944e03e
AS		 2565 /* Decode key from its hex representation. */
2566 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2567 goto out;
e48d4bbf 2568
671ea6b4 2569 r = crypt_setkey(cc);
265e9098
OK		 2570 if (!r)
2571 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2572
2573out:
2574 /* Hex key string not needed after here, so wipe it. */
2575 memset(key, '0', key_string_len);
2576
2577 return r;
e48d4bbf
MB		 2578}
2579
2580static int crypt_wipe_key(struct crypt_config *cc)
2581{
c82feeec
OK		 2582 int r;
2583
e48d4bbf 2584 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2585 get_random_bytes(&cc->key, cc->key_size);
4a52ffc7
MB		 2586
2587 /* Wipe IV private keys */
2588 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2589 r = cc->iv_gen_ops->wipe(cc);
2590 if (r)
2591 return r;
2592 }
2593
453431a5 2594 kfree_sensitive(cc->key_string);
c538f6ec 2595 cc->key_string = NULL;
c82feeec
OK		 2596 r = crypt_setkey(cc);
2597 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2598
c82feeec 2599 return r;
e48d4bbf
MB		 2600}
2601
5059353d
MP		 2602static void crypt_calculate_pages_per_client(void)
2603{
ca79b0c2 2604 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2605
2606 if (!dm_crypt_clients_n)
2607 return;
2608
2609 pages /= dm_crypt_clients_n;
2610 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2611 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2612 dm_crypt_pages_per_client = pages;
2613}
2614
2615static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2616{
2617 struct crypt_config *cc = pool_data;
2618 struct page *page;
2619
2620 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2621 likely(gfp_mask & __GFP_NORETRY))
2622 return NULL;
2623
2624 page = alloc_page(gfp_mask);
2625 if (likely(page != NULL))
2626 percpu_counter_add(&cc->n_allocated_pages, 1);
2627
2628 return page;
2629}
2630
2631static void crypt_page_free(void *page, void *pool_data)
2632{
2633 struct crypt_config *cc = pool_data;
2634
2635 __free_page(page);
2636 percpu_counter_sub(&cc->n_allocated_pages, 1);
2637}
2638
28513fcc
MB		 2639static void crypt_dtr(struct dm_target *ti)
2640{
2641 struct crypt_config *cc = ti->private;
2642
2643 ti->private = NULL;
2644
2645 if (!cc)
2646 return;
2647
f659b100 2648 if (cc->write_thread)
dc267621
MP		 2649 kthread_stop(cc->write_thread);
2650
28513fcc
MB		 2651 if (cc->io_queue)
2652 destroy_workqueue(cc->io_queue);
2653 if (cc->crypt_queue)
2654 destroy_workqueue(cc->crypt_queue);
2655
fd2d231f
MP		 2656 crypt_free_tfms(cc);
2657
6f1c819c 2658 bioset_exit(&cc->bs);
28513fcc 2659
6f1c819c
KO		 2660 mempool_exit(&cc->page_pool);
2661 mempool_exit(&cc->req_pool);
2662 mempool_exit(&cc->tag_pool);
2663
d00a11df
KO		 2664 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2665 percpu_counter_destroy(&cc->n_allocated_pages);
2666
28513fcc
MB		 2667 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2668 cc->iv_gen_ops->dtr(cc);
2669
28513fcc
MB		 2670 if (cc->dev)
2671 dm_put_device(ti, cc->dev);
2672
453431a5
WL		 2673 kfree_sensitive(cc->cipher_string);
2674 kfree_sensitive(cc->key_string);
2675 kfree_sensitive(cc->cipher_auth);
2676 kfree_sensitive(cc->authenc_key);
28513fcc 2677
d5ffebdd
MS		 2678 mutex_destroy(&cc->bio_alloc_lock);
2679
28513fcc 2680 /* Must zero key material before freeing */
453431a5 2681 kfree_sensitive(cc);
5059353d
MP		 2682
2683 spin_lock(&dm_crypt_clients_lock);
2684 WARN_ON(!dm_crypt_clients_n);
2685 dm_crypt_clients_n--;
2686 crypt_calculate_pages_per_client();
2687 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2688}
2689
e889f97a
MB		 2690static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2691{
2692 struct crypt_config *cc = ti->private;
2693
33d2f09f 2694 if (crypt_integrity_aead(cc))
e889f97a
MB		 2695 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2696 else
2697 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2698
e889f97a
MB		 2699 if (cc->iv_size)
2700 /* at least a 64 bit sector number should fit in our buffer */
2701 cc->iv_size = max(cc->iv_size,
2702 (unsigned int)(sizeof(u64) / sizeof(u8)));
2703 else if (ivmode) {
2704 DMWARN("Selected cipher does not support IVs");
2705 ivmode = NULL;
2706 }
2707
2708 /* Choose ivmode, see comments at iv code. */
2709 if (ivmode == NULL)
2710 cc->iv_gen_ops = NULL;
2711 else if (strcmp(ivmode, "plain") == 0)
2712 cc->iv_gen_ops = &crypt_iv_plain_ops;
2713 else if (strcmp(ivmode, "plain64") == 0)
2714 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2715 else if (strcmp(ivmode, "plain64be") == 0)
2716 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2717 else if (strcmp(ivmode, "essiv") == 0)
2718 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2719 else if (strcmp(ivmode, "benbi") == 0)
2720 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2721 else if (strcmp(ivmode, "null") == 0)
2722 cc->iv_gen_ops = &crypt_iv_null_ops;
b9411d73
MB		 2723 else if (strcmp(ivmode, "eboiv") == 0)
2724 cc->iv_gen_ops = &crypt_iv_eboiv_ops;
bbb16584
MB		 2725 else if (strcmp(ivmode, "elephant") == 0) {
2726 cc->iv_gen_ops = &crypt_iv_elephant_ops;
2727 cc->key_parts = 2;
2728 cc->key_extra_size = cc->key_size / 2;
2729 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE)
2730 return -EINVAL;
2731 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags);
2732 } else if (strcmp(ivmode, "lmk") == 0) {
e889f97a
MB		 2733 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2734 /*
2735 * Version 2 and 3 is recognised according
2736 * to length of provided multi-key string.
2737 * If present (version 3), last key is used as IV seed.
2738 * All keys (including IV seed) are always the same size.
2739 */
2740 if (cc->key_size % cc->key_parts) {
2741 cc->key_parts++;
2742 cc->key_extra_size = cc->key_size / cc->key_parts;
2743 }
2744 } else if (strcmp(ivmode, "tcw") == 0) {
2745 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2746 cc->key_parts += 2; /* IV + whitening */
2747 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2748 } else if (strcmp(ivmode, "random") == 0) {
2749 cc->iv_gen_ops = &crypt_iv_random_ops;
2750 /* Need storage space in integrity fields. */
2751 cc->integrity_iv_size = cc->iv_size;
2752 } else {
2753 ti->error = "Invalid IV mode";
2754 return -EINVAL;
2755 }
2756
2757 return 0;
2758}
2759
33d2f09f
MB		 2760/*
2761 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2762 * The HMAC is needed to calculate tag size (HMAC digest size).
2763 * This should be probably done by crypto-api calls (once available...)
2764 */
2765static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2766{
2767 char *start, *end, *mac_alg = NULL;
2768 struct crypto_ahash *mac;
2769
2770 if (!strstarts(cipher_api, "authenc("))
2771 return 0;
2772
2773 start = strchr(cipher_api, '(');
2774 end = strchr(cipher_api, ',');
2775 if (!start || !end || ++start > end)
2776 return -EINVAL;
2777
2778 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2779 if (!mac_alg)
2780 return -ENOMEM;
2781 strncpy(mac_alg, start, end - start);
2782
cd746938 2783 mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
33d2f09f
MB		 2784 kfree(mac_alg);
2785
2786 if (IS_ERR(mac))
2787 return PTR_ERR(mac);
2788
2789 cc->key_mac_size = crypto_ahash_digestsize(mac);
2790 crypto_free_ahash(mac);
2791
2792 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2793 if (!cc->authenc_key)
2794 return -ENOMEM;
2795
2796 return 0;
2797}
2798
2799static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2800 char **ivmode, char **ivopts)
2801{
2802 struct crypt_config *cc = ti->private;
a1a262b6 2803 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME];
33d2f09f
MB		 2804 int ret = -EINVAL;
2805
2806 cc->tfms_count = 1;
2807
2808 /*
2809 * New format (capi: prefix)
2810 * capi:cipher_api_spec-iv:ivopts
2811 */
2812 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2813
2814 /* Separate IV options if present, it can contain another '-' in hash name */
2815 *ivopts = strrchr(tmp, ':');
2816 if (*ivopts) {
2817 **ivopts = '\0';
2818 (*ivopts)++;
2819 }
2820 /* Parse IV mode */
2821 *ivmode = strrchr(tmp, '-');
2822 if (*ivmode) {
2823 **ivmode = '\0';
2824 (*ivmode)++;
2825 }
2826 /* The rest is crypto API spec */
2827 cipher_api = tmp;
33d2f09f 2828
a1a262b6
AB		 2829 /* Alloc AEAD, can be used only in new format. */
2830 if (crypt_integrity_aead(cc)) {
2831 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2832 if (ret < 0) {
2833 ti->error = "Invalid AEAD cipher spec";
2834 return -ENOMEM;
2835 }
2836 }
2837
33d2f09f
MB		 2838 if (*ivmode && !strcmp(*ivmode, "lmk"))
2839 cc->tfms_count = 64;
2840
a1a262b6
AB		 2841 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2842 if (!*ivopts) {
2843 ti->error = "Digest algorithm missing for ESSIV mode";
2844 return -EINVAL;
2845 }
2846 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)",
2847 cipher_api, *ivopts);
2848 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
2849 ti->error = "Cannot allocate cipher string";
2850 return -ENOMEM;
2851 }
2852 cipher_api = buf;
2853 }
2854
33d2f09f
MB		 2855 cc->key_parts = cc->tfms_count;
2856
2857 /* Allocate cipher */
2858 ret = crypt_alloc_tfms(cc, cipher_api);
2859 if (ret < 0) {
2860 ti->error = "Error allocating crypto tfm";
2861 return ret;
2862 }
2863
a1a262b6 2864 if (crypt_integrity_aead(cc))
33d2f09f 2865 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
a1a262b6 2866 else
33d2f09f
MB		 2867 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2868
33d2f09f
MB		 2869 return 0;
2870}
2871
2872static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2873 char **ivmode, char **ivopts)
1da177e4 2874{
5ebaee6d 2875 struct crypt_config *cc = ti->private;
33d2f09f 2876 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2877 char *cipher_api = NULL;
fd2d231f 2878 int ret = -EINVAL;
31998ef1 2879 char dummy;
1da177e4 2880
33d2f09f 2881 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2882 ti->error = "Bad cipher specification";
1da177e4
LT		 2883 return -EINVAL;
2884 }
2885
5ebaee6d
MB		 2886 /*
2887 * Legacy dm-crypt cipher specification
d1f96423 2888 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2889 */
2890 tmp = cipher_in;
d1f96423
MB		 2891 keycount = strsep(&tmp, "-");
2892 cipher = strsep(&keycount, ":");
2893
2894 if (!keycount)
2895 cc->tfms_count = 1;
31998ef1 2896 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2897 !is_power_of_2(cc->tfms_count)) {
2898 ti->error = "Bad cipher key count specification";
2899 return -EINVAL;
2900 }
2901 cc->key_parts = cc->tfms_count;
5ebaee6d 2902
1da177e4 2903 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 2904 *ivmode = strsep(&tmp, ":");
2905 *ivopts = tmp;
1da177e4 2906
7dbcd137
MB		 2907 /*
2908 * For compatibility with the original dm-crypt mapping format, if
2909 * only the cipher name is supplied, use cbc-plain.
2910 */
33d2f09f 2911 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2912 chainmode = "cbc";
33d2f09f 2913 *ivmode = "plain";
1da177e4
LT		 2914 }
2915
33d2f09f 2916 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2917 ti->error = "IV mechanism required";
2918 return -EINVAL;
1da177e4
LT		 2919 }
2920
5ebaee6d
MB		 2921 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2922 if (!cipher_api)
2923 goto bad_mem;
2924
a1a262b6
AB		 2925 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2926 if (!*ivopts) {
2927 ti->error = "Digest algorithm missing for ESSIV mode";
2928 kfree(cipher_api);
2929 return -EINVAL;
2930 }
2931 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2932 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts);
2933 } else {
2934 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2935 "%s(%s)", chainmode, cipher);
2936 }
2937 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
5ebaee6d
MB		 2938 kfree(cipher_api);
2939 goto bad_mem;
1da177e4
LT		 2940 }
2941
5ebaee6d 2942 /* Allocate cipher */
fd2d231f
MP		 2943 ret = crypt_alloc_tfms(cc, cipher_api);
2944 if (ret < 0) {
2945 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2946 kfree(cipher_api);
2947 return ret;
1da177e4 2948 }
bd86e320 2949 kfree(cipher_api);
1da177e4 2950
33d2f09f
MB		 2951 return 0;
2952bad_mem:
2953 ti->error = "Cannot allocate cipher strings";
2954 return -ENOMEM;
2955}
5ebaee6d 2956
33d2f09f
MB		 2957static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2958{
2959 struct crypt_config *cc = ti->private;
2960 char *ivmode = NULL, *ivopts = NULL;
2961 int ret;
2962
2963 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2964 if (!cc->cipher_string) {
2965 ti->error = "Cannot allocate cipher strings";
2966 return -ENOMEM;
1da177e4
LT		 2967 }
2968
33d2f09f
MB		 2969 if (strstarts(cipher_in, "capi:"))
2970 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2971 else
2972 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2973 if (ret)
2974 return ret;
2975
5ebaee6d 2976 /* Initialize IV */
e889f97a
MB		 2977 ret = crypt_ctr_ivmode(ti, ivmode);
2978 if (ret < 0)
33d2f09f 2979 return ret;
1da177e4 2980
da31a078
MB		 2981 /* Initialize and set key */
2982 ret = crypt_set_key(cc, key);
2983 if (ret < 0) {
2984 ti->error = "Error decoding and setting key";
33d2f09f 2985 return ret;
da31a078
MB		 2986 }
2987
28513fcc
MB		 2988 /* Allocate IV */
2989 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2990 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2991 if (ret < 0) {
2992 ti->error = "Error creating IV";
33d2f09f 2993 return ret;
28513fcc
MB		 2994 }
2995 }
1da177e4 2996
28513fcc
MB		 2997 /* Initialize IV (set keys for ESSIV etc) */
2998 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2999 ret = cc->iv_gen_ops->init(cc);
3000 if (ret < 0) {
3001 ti->error = "Error initialising IV";
33d2f09f 3002 return ret;
28513fcc 3003 }
b95bf2d3
MB		 3004 }
3005
dc94902b
OK		 3006 /* wipe the kernel key payload copy */
3007 if (cc->key_string)
3008 memset(cc->key, 0, cc->key_size * sizeof(u8));
3009
5ebaee6d 3010 return ret;
5ebaee6d 3011}
5ebaee6d 3012
ef43aa38
MB		 3013static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
3014{
3015 struct crypt_config *cc = ti->private;
3016 struct dm_arg_set as;
5916a22b 3017 static const struct dm_arg _args[] = {
39d42fa9 3018 {0, 8, "Invalid number of feature args"},
ef43aa38
MB		 3019 };
3020 unsigned int opt_params, val;
3021 const char *opt_string, *sval;
8f0009a2 3022 char dummy;
ef43aa38
MB		 3023 int ret;
3024
3025 /* Optional parameters */
3026 as.argc = argc;
3027 as.argv = argv;
3028
3029 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
3030 if (ret)
3031 return ret;
3032
3033 while (opt_params--) {
3034 opt_string = dm_shift_arg(&as);
3035 if (!opt_string) {
3036 ti->error = "Not enough feature arguments";
3037 return -EINVAL;
3038 }
3039
3040 if (!strcasecmp(opt_string, "allow_discards"))
3041 ti->num_discard_bios = 1;
3042
3043 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
3044 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
3045
3046 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
3047 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3048 else if (!strcasecmp(opt_string, "no_read_workqueue"))
3049 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3050 else if (!strcasecmp(opt_string, "no_write_workqueue"))
3051 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ef43aa38
MB		 3052 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
3053 if (val == 0 || val > MAX_TAG_SIZE) {
3054 ti->error = "Invalid integrity arguments";
3055 return -EINVAL;
3056 }
3057 cc->on_disk_tag_size = val;
3058 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
3059 if (!strcasecmp(sval, "aead")) {
3060 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 3061 } else if (strcasecmp(sval, "none")) {
3062 ti->error = "Unknown integrity profile";
3063 return -EINVAL;
3064 }
3065
3066 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
3067 if (!cc->cipher_auth)
3068 return -ENOMEM;
ff3af92b 3069 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 3070 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
3071 cc->sector_size > 4096 ||
ff3af92b 3072 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 3073 ti->error = "Invalid feature value for sector_size";
3074 return -EINVAL;
3075 }
783874b0
MB		 3076 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
3077 ti->error = "Device size is not multiple of sector_size feature";
3078 return -EINVAL;
3079 }
ff3af92b 3080 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 3081 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
3082 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
3083 else {
ef43aa38
MB		 3084 ti->error = "Invalid feature arguments";
3085 return -EINVAL;
3086 }
3087 }
3088
3089 return 0;
5ebaee6d
MB		 3090}
3091
8e225f04
DLM		 3092#ifdef CONFIG_BLK_DEV_ZONED
3093
3094static int crypt_report_zones(struct dm_target *ti,
3095 struct dm_report_zones_args *args, unsigned int nr_zones)
3096{
3097 struct crypt_config *cc = ti->private;
3098 sector_t sector = cc->start + dm_target_offset(ti, args->next_sector);
3099
3100 args->start = cc->start;
3101 return blkdev_report_zones(cc->dev->bdev, sector, nr_zones,
3102 dm_report_zones_cb, args);
3103}
3104
3105#endif
3106
5ebaee6d
MB		 3107/*
3108 * Construct an encryption mapping:
c538f6ec 3109 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 3110 */
3111static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
3112{
3113 struct crypt_config *cc;
ed0302e8 3114 const char *devname = dm_table_device_name(ti->table);
c538f6ec 3115 int key_size;
ef43aa38 3116 unsigned int align_mask;
5ebaee6d
MB		 3117 unsigned long long tmpll;
3118 int ret;
ef43aa38 3119 size_t iv_size_padding, additional_req_size;
31998ef1 3120 char dummy;
772ae5f5 3121
772ae5f5 3122 if (argc < 5) {
5ebaee6d
MB		 3123 ti->error = "Not enough arguments";
3124 return -EINVAL;
1da177e4
LT		 3125 }
3126
c538f6ec
OK		 3127 key_size = get_key_size(&argv[1]);
3128 if (key_size < 0) {
3129 ti->error = "Cannot parse key size";
3130 return -EINVAL;
3131 }
5ebaee6d 3132
9c81c99b 3133 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL);
5ebaee6d
MB		 3134 if (!cc) {
3135 ti->error = "Cannot allocate encryption context";
3136 return -ENOMEM;
3137 }
69a8cfcd 3138 cc->key_size = key_size;
8f0009a2 3139 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 3140 cc->sector_shift = 0;
5ebaee6d
MB		 3141
3142 ti->private = cc;
ef43aa38 3143
5059353d
MP		 3144 spin_lock(&dm_crypt_clients_lock);
3145 dm_crypt_clients_n++;
3146 crypt_calculate_pages_per_client();
3147 spin_unlock(&dm_crypt_clients_lock);
3148
3149 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
3150 if (ret < 0)
3151 goto bad;
3152
ef43aa38
MB		 3153 /* Optional parameters need to be read before cipher constructor */
3154 if (argc > 5) {
3155 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
3156 if (ret)
3157 goto bad;
3158 }
3159
5ebaee6d
MB		 3160 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
3161 if (ret < 0)
3162 goto bad;
3163
33d2f09f 3164 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 3165 cc->dmreq_start = sizeof(struct aead_request);
3166 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
3167 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
3168 } else {
3169 cc->dmreq_start = sizeof(struct skcipher_request);
3170 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
3171 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
3172 }
d49ec52f
MP		 3173 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
3174
ef43aa38 3175 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 3176 /* Allocate the padding exactly */
3177 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 3178 & align_mask;
d49ec52f
MP		 3179 } else {
3180 /*
3181 * If the cipher requires greater alignment than kmalloc
3182 * alignment, we don't know the exact position of the
3183 * initialization vector. We must assume worst case.
3184 */
ef43aa38 3185 iv_size_padding = align_mask;
d49ec52f 3186 }
ddd42edf 3187
ef43aa38
MB		 3188 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
3189 additional_req_size = sizeof(struct dm_crypt_request) +
3190 iv_size_padding + cc->iv_size +
3191 cc->iv_size +
3192 sizeof(uint64_t) +
3193 sizeof(unsigned int);
3194
6f1c819c
KO		 3195 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
3196 if (ret) {
ddd42edf 3197 ti->error = "Cannot allocate crypt request mempool";
28513fcc 3198 goto bad;
ddd42edf 3199 }
ddd42edf 3200
30187e1d 3201 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 3202 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 3203 ARCH_KMALLOC_MINALIGN);
298a9fa0 3204
6f1c819c
KO		 3205 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
3206 if (ret) {
72d94861 3207 ti->error = "Cannot allocate page mempool";
28513fcc 3208 goto bad;
1da177e4
LT		 3209 }
3210
6f1c819c
KO		 3211 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
3212 if (ret) {
6a24c718 3213 ti->error = "Cannot allocate crypt bioset";
28513fcc 3214 goto bad;
6a24c718
MB		 3215 }
3216
7145c241
MP		 3217 mutex_init(&cc->bio_alloc_lock);
3218
28513fcc 3219 ret = -EINVAL;
8f0009a2
MB		 3220 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
3221 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 3222 ti->error = "Invalid iv_offset sector";
28513fcc 3223 goto bad;
1da177e4 3224 }
4ee218cd 3225 cc->iv_offset = tmpll;
1da177e4 3226
e80d1c80
VG		 3227 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
3228 if (ret) {
28513fcc
MB		 3229 ti->error = "Device lookup failed";
3230 goto bad;
3231 }
3232
e80d1c80 3233 ret = -EINVAL;
ef87bfc2 3234 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 3235 ti->error = "Invalid device sector";
28513fcc 3236 goto bad;
1da177e4 3237 }
4ee218cd 3238 cc->start = tmpll;
1da177e4 3239
8e225f04
DLM		 3240 /*
3241 * For zoned block devices, we need to preserve the issuer write
3242 * ordering. To do so, disable write workqueues and force inline
3243 * encryption completion.
3244 */
3245 if (bdev_is_zoned(cc->dev->bdev)) {
3246 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
3247 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags);
3248 }
3249
33d2f09f 3250 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 3251 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 3252 if (ret)
3253 goto bad;
3254
ef43aa38
MB		 3255 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
3256 if (!cc->tag_pool_max_sectors)
3257 cc->tag_pool_max_sectors = 1;
f3396c58 3258
6f1c819c 3259 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 3260 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 3261 if (ret) {
ef43aa38
MB		 3262 ti->error = "Cannot allocate integrity tags mempool";
3263 goto bad;
772ae5f5 3264 }
583fe747
MP		 3265
3266 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 3267 }
3268
28513fcc 3269 ret = -ENOMEM;
f612b213 3270 cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
cabf08e4
MB		 3271 if (!cc->io_queue) {
3272 ti->error = "Couldn't create kcryptd io queue";
28513fcc 3273 goto bad;
cabf08e4
MB		 3274 }
3275
f3396c58 3276 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
48b0777c 3277 cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
ed0302e8 3278 1, devname);
f3396c58 3279 else
48b0777c
MS		 3280 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
3281 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 3282 num_online_cpus(), devname);
cabf08e4 3283 if (!cc->crypt_queue) {
9934a8be 3284 ti->error = "Couldn't create kcryptd queue";
28513fcc 3285 goto bad;
9934a8be
MB		 3286 }
3287
c7329eff 3288 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 3289 cc->write_tree = RB_ROOT;
dc267621 3290
ed0302e8 3291 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 3292 if (IS_ERR(cc->write_thread)) {
3293 ret = PTR_ERR(cc->write_thread);
3294 cc->write_thread = NULL;
3295 ti->error = "Couldn't spawn write thread";
3296 goto bad;
3297 }
3298 wake_up_process(cc->write_thread);
3299
55a62eef 3300 ti->num_flush_bios = 1;
983c7db3 3301
1da177e4
LT		 3302 return 0;
3303
28513fcc
MB		 3304bad:
3305 crypt_dtr(ti);
3306 return ret;
1da177e4
LT		 3307}
3308
7de3ee57 3309static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 3310{
028867ac 3311 struct dm_crypt_io *io;
49a8a920 3312 struct crypt_config *cc = ti->private;
647c7db1 3313
772ae5f5 3314 /*
28a8f0d3
MC		 3315 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
3316 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 3317 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 3318 */
1eff9d32 3319 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 3320 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 3321 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 3322 if (bio_sectors(bio))
4f024f37
KO		 3323 bio->bi_iter.bi_sector = cc->start +
3324 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 3325 return DM_MAPIO_REMAPPED;
3326 }
1da177e4 3327
4e870e94
MP		 3328 /*
3329 * Check if bio is too large, split as needed.
3330 */
3331 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 3332 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 3333 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
3334
8f0009a2
MB		 3335 /*
3336 * Ensure that bio is a multiple of internal sector encryption size
3337 * and is aligned to this size as defined in IO hints.
3338 */
3339 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 3340 return DM_MAPIO_KILL;
8f0009a2
MB		 3341
3342 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 3343 return DM_MAPIO_KILL;
8f0009a2 3344
298a9fa0
MP		 3345 io = dm_per_bio_data(bio, cc->per_bio_data_size);
3346 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 3347
3348 if (cc->on_disk_tag_size) {
583fe747 3349 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 3350
3351 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 3352 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 3353 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
3354 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
3355 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 3356 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 3357 io->integrity_metadata_from_pool = true;
3358 }
3359 }
3360
33d2f09f 3361 if (crypt_integrity_aead(cc))
ef43aa38
MB		 3362 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
3363 else
3364 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 3365
20c82538
MB		 3366 if (bio_data_dir(io->base_bio) == READ) {
3367 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 3368 kcryptd_queue_read(io);
20c82538 3369 } else
cabf08e4 3370 kcryptd_queue_crypt(io);
1da177e4 3371
d2a7ad29 3372 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 3373}
3374
fd7c092e
MP		 3375static void crypt_status(struct dm_target *ti, status_type_t type,
3376 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 3377{
5ebaee6d 3378 struct crypt_config *cc = ti->private;
fd7c092e 3379 unsigned i, sz = 0;
f3396c58 3380 int num_feature_args = 0;
1da177e4
LT		 3381
3382 switch (type) {
3383 case STATUSTYPE_INFO:
3384 result[0] = '\0';
3385 break;
3386
3387 case STATUSTYPE_TABLE:
7dbcd137 3388 DMEMIT("%s ", cc->cipher_string);
1da177e4 3389
c538f6ec
OK		 3390 if (cc->key_size > 0) {
3391 if (cc->key_string)
3392 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
3393 else
3394 for (i = 0; i < cc->key_size; i++)
3395 DMEMIT("%02x", cc->key[i]);
3396 } else
fd7c092e 3397 DMEMIT("-");
1da177e4 3398
4ee218cd
AM		 3399 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
3400 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 3401
f3396c58
MP		 3402 num_feature_args += !!ti->num_discard_bios;
3403 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 3404 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3405 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3406 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ff3af92b 3407 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 3408 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 3409 if (cc->on_disk_tag_size)
3410 num_feature_args++;
f3396c58
MP		 3411 if (num_feature_args) {
3412 DMEMIT(" %d", num_feature_args);
3413 if (ti->num_discard_bios)
3414 DMEMIT(" allow_discards");
3415 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
3416 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 3417 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
3418 DMEMIT(" submit_from_crypt_cpus");
39d42fa9
IK		 3419 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags))
3420 DMEMIT(" no_read_workqueue");
3421 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))
3422 DMEMIT(" no_write_workqueue");
ef43aa38
MB		 3423 if (cc->on_disk_tag_size)
3424 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 3425 if (cc->sector_size != (1 << SECTOR_SHIFT))
3426 DMEMIT(" sector_size:%d", cc->sector_size);
3427 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
3428 DMEMIT(" iv_large_sectors");
f3396c58 3429 }
772ae5f5 3430
1da177e4
LT		 3431 break;
3432 }
1da177e4
LT		 3433}
3434
e48d4bbf
MB		 3435static void crypt_postsuspend(struct dm_target *ti)
3436{
3437 struct crypt_config *cc = ti->private;
3438
3439 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3440}
3441
3442static int crypt_preresume(struct dm_target *ti)
3443{
3444 struct crypt_config *cc = ti->private;
3445
3446 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3447 DMERR("aborting resume - crypt key is not set.");
3448 return -EAGAIN;
3449 }
3450
3451 return 0;
3452}
3453
3454static void crypt_resume(struct dm_target *ti)
3455{
3456 struct crypt_config *cc = ti->private;
3457
3458 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3459}
3460
3461/* Message interface
3462 * key set <key>
3463 * key wipe
3464 */
1eb5fa84
MS		 3465static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3466 char *result, unsigned maxlen)
e48d4bbf
MB		 3467{
3468 struct crypt_config *cc = ti->private;
c538f6ec 3469 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3470
3471 if (argc < 2)
3472 goto error;
3473
498f0103 3474 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3475 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3476 DMWARN("not suspended during key manipulation.");
3477 return -EINVAL;
3478 }
498f0103 3479 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3480 /* The key size may not be changed. */
3481 key_size = get_key_size(&argv[2]);
3482 if (key_size < 0 || cc->key_size != key_size) {
3483 memset(argv[2], '0', strlen(argv[2]));
3484 return -EINVAL;
3485 }
3486
542da317
MB		 3487 ret = crypt_set_key(cc, argv[2]);
3488 if (ret)
3489 return ret;
3490 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3491 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3492 /* wipe the kernel key payload copy */
3493 if (cc->key_string)
3494 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3495 return ret;
3496 }
4a52ffc7 3497 if (argc == 2 && !strcasecmp(argv[1], "wipe"))
e48d4bbf
MB		 3498 return crypt_wipe_key(cc);
3499 }
3500
3501error:
3502 DMWARN("unrecognised message received.");
3503 return -EINVAL;
3504}
3505
af4874e0
MS		 3506static int crypt_iterate_devices(struct dm_target *ti,
3507 iterate_devices_callout_fn fn, void *data)
3508{
3509 struct crypt_config *cc = ti->private;
3510
5dea271b 3511 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3512}
3513
586b286b
MS		 3514static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3515{
8f0009a2
MB		 3516 struct crypt_config *cc = ti->private;
3517
586b286b
MS		 3518 /*
3519 * Unfortunate constraint that is required to avoid the potential
3520 * for exceeding underlying device's max_segments limits -- due to
3521 * crypt_alloc_buffer() possibly allocating pages for the encryption
3522 * bio that are not as physically contiguous as the original bio.
3523 */
3524 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3525
bc9e9cf0 3526 limits->logical_block_size =
64611a15 3527 max_t(unsigned, limits->logical_block_size, cc->sector_size);
bc9e9cf0
MP		 3528 limits->physical_block_size =
3529 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3530 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3531}
3532
1da177e4
LT		 3533static struct target_type crypt_target = {
3534 .name = "crypt",
39d42fa9 3535 .version = {1, 22, 0},
1da177e4
LT		 3536 .module = THIS_MODULE,
3537 .ctr = crypt_ctr,
3538 .dtr = crypt_dtr,
8e225f04
DLM		 3539#ifdef CONFIG_BLK_DEV_ZONED
3540 .features = DM_TARGET_ZONED_HM,
3541 .report_zones = crypt_report_zones,
3542#endif
1da177e4
LT		 3543 .map = crypt_map,
3544 .status = crypt_status,
e48d4bbf
MB		 3545 .postsuspend = crypt_postsuspend,
3546 .preresume = crypt_preresume,
3547 .resume = crypt_resume,
3548 .message = crypt_message,
af4874e0 3549 .iterate_devices = crypt_iterate_devices,
586b286b 3550 .io_hints = crypt_io_hints,
1da177e4
LT		 3551};
3552
3553static int __init dm_crypt_init(void)
3554{
3555 int r;
3556
1da177e4 3557 r = dm_register_target(&crypt_target);
94f5e024 3558 if (r < 0)
72d94861 3559 DMERR("register failed %d", r);
1da177e4 3560
1da177e4
LT		 3561 return r;
3562}
3563
3564static void __exit dm_crypt_exit(void)
3565{
10d3bd09 3566 dm_unregister_target(&crypt_target);
1da177e4
LT		 3567}
3568
3569module_init(dm_crypt_init);
3570module_exit(dm_crypt_exit);
3571
bf14299f 3572MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3573MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3574MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)