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Linux 5.9-rc2
[linux-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
34745785
MB		 427 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
428 if (IS_ERR(lmk->hash_tfm)) {
429 ti->error = "Error initializing LMK hash";
430 return PTR_ERR(lmk->hash_tfm);
431 }
432
433 /* No seed in LMK version 2 */
434 if (cc->key_parts == cc->tfms_count) {
435 lmk->seed = NULL;
436 return 0;
437 }
438
439 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
440 if (!lmk->seed) {
441 crypt_iv_lmk_dtr(cc);
442 ti->error = "Error kmallocing seed storage in LMK";
443 return -ENOMEM;
444 }
445
446 return 0;
447}
448
449static int crypt_iv_lmk_init(struct crypt_config *cc)
450{
451 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
452 int subkey_size = cc->key_size / cc->key_parts;
453
454 /* LMK seed is on the position of LMK_KEYS + 1 key */
455 if (lmk->seed)
456 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
457 crypto_shash_digestsize(lmk->hash_tfm));
458
459 return 0;
460}
461
462static int crypt_iv_lmk_wipe(struct crypt_config *cc)
463{
464 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
465
466 if (lmk->seed)
467 memset(lmk->seed, 0, LMK_SEED_SIZE);
468
469 return 0;
470}
471
472static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
473 struct dm_crypt_request *dmreq,
474 u8 *data)
475{
476 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
b6106265 477 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
34745785 478 struct md5_state md5state;
da31a078 479 __le32 buf[4];
34745785
MB		 480 int i, r;
481
b6106265 482 desc->tfm = lmk->hash_tfm;
34745785 483
b6106265 484 r = crypto_shash_init(desc);
34745785
MB		 485 if (r)
486 return r;
487
488 if (lmk->seed) {
b6106265 489 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
34745785
MB		 490 if (r)
491 return r;
492 }
493
494 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
b6106265 495 r = crypto_shash_update(desc, data + 16, 16 * 31);
34745785
MB		 496 if (r)
497 return r;
498
499 /* Sector is cropped to 56 bits here */
500 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
501 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
502 buf[2] = cpu_to_le32(4024);
503 buf[3] = 0;
b6106265 504 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
34745785
MB		 505 if (r)
506 return r;
507
508 /* No MD5 padding here */
b6106265 509 r = crypto_shash_export(desc, &md5state);
34745785
MB		 510 if (r)
511 return r;
512
513 for (i = 0; i < MD5_HASH_WORDS; i++)
514 __cpu_to_le32s(&md5state.hash[i]);
515 memcpy(iv, &md5state.hash, cc->iv_size);
516
517 return 0;
518}
519
520static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
521 struct dm_crypt_request *dmreq)
522{
ef43aa38 523 struct scatterlist *sg;
34745785
MB		 524 u8 *src;
525 int r = 0;
526
527 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
ef43aa38
MB		 528 sg = crypt_get_sg_data(cc, dmreq->sg_in);
529 src = kmap_atomic(sg_page(sg));
530 r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset);
c2e022cb 531 kunmap_atomic(src);
34745785
MB		 532 } else
533 memset(iv, 0, cc->iv_size);
534
535 return r;
536}
537
538static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
539 struct dm_crypt_request *dmreq)
540{
ef43aa38 541 struct scatterlist *sg;
34745785
MB		 542 u8 *dst;
543 int r;
544
545 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
546 return 0;
547
ef43aa38
MB		 548 sg = crypt_get_sg_data(cc, dmreq->sg_out);
549 dst = kmap_atomic(sg_page(sg));
550 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset);
34745785
MB		 551
552 /* Tweak the first block of plaintext sector */
553 if (!r)
ef43aa38 554 crypto_xor(dst + sg->offset, iv, cc->iv_size);
34745785 555
c2e022cb 556 kunmap_atomic(dst);
34745785
MB		 557 return r;
558}
559
ed04d981
MB		 560static void crypt_iv_tcw_dtr(struct crypt_config *cc)
561{
562 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
563
453431a5 564 kfree_sensitive(tcw->iv_seed);
ed04d981 565 tcw->iv_seed = NULL;
453431a5 566 kfree_sensitive(tcw->whitening);
ed04d981
MB		 567 tcw->whitening = NULL;
568
569 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
570 crypto_free_shash(tcw->crc32_tfm);
571 tcw->crc32_tfm = NULL;
572}
573
574static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
575 const char *opts)
576{
577 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
578
8f0009a2
MB		 579 if (cc->sector_size != (1 << SECTOR_SHIFT)) {
580 ti->error = "Unsupported sector size for TCW";
581 return -EINVAL;
582 }
583
ed04d981
MB		 584 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
585 ti->error = "Wrong key size for TCW";
586 return -EINVAL;
587 }
588
589 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
590 if (IS_ERR(tcw->crc32_tfm)) {
591 ti->error = "Error initializing CRC32 in TCW";
592 return PTR_ERR(tcw->crc32_tfm);
593 }
594
595 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
596 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
597 if (!tcw->iv_seed || !tcw->whitening) {
598 crypt_iv_tcw_dtr(cc);
599 ti->error = "Error allocating seed storage in TCW";
600 return -ENOMEM;
601 }
602
603 return 0;
604}
605
606static int crypt_iv_tcw_init(struct crypt_config *cc)
607{
608 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
609 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
610
611 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
612 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
613 TCW_WHITENING_SIZE);
614
615 return 0;
616}
617
618static int crypt_iv_tcw_wipe(struct crypt_config *cc)
619{
620 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
621
622 memset(tcw->iv_seed, 0, cc->iv_size);
623 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
624
625 return 0;
626}
627
628static int crypt_iv_tcw_whitening(struct crypt_config *cc,
629 struct dm_crypt_request *dmreq,
630 u8 *data)
631{
632 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 633 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981 634 u8 buf[TCW_WHITENING_SIZE];
b6106265 635 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
ed04d981
MB		 636 int i, r;
637
638 /* xor whitening with sector number */
45fe93df
AB		 639 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
640 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
ed04d981
MB		 641
642 /* calculate crc32 for every 32bit part and xor it */
b6106265 643 desc->tfm = tcw->crc32_tfm;
ed04d981 644 for (i = 0; i < 4; i++) {
b6106265 645 r = crypto_shash_init(desc);
ed04d981
MB		 646 if (r)
647 goto out;
b6106265 648 r = crypto_shash_update(desc, &buf[i * 4], 4);
ed04d981
MB		 649 if (r)
650 goto out;
b6106265 651 r = crypto_shash_final(desc, &buf[i * 4]);
ed04d981
MB		 652 if (r)
653 goto out;
654 }
655 crypto_xor(&buf[0], &buf[12], 4);
656 crypto_xor(&buf[4], &buf[8], 4);
657
658 /* apply whitening (8 bytes) to whole sector */
659 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
660 crypto_xor(data + i * 8, buf, 8);
661out:
1a71d6ff 662 memzero_explicit(buf, sizeof(buf));
ed04d981
MB		 663 return r;
664}
665
666static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
667 struct dm_crypt_request *dmreq)
668{
ef43aa38 669 struct scatterlist *sg;
ed04d981 670 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
350b5393 671 __le64 sector = cpu_to_le64(dmreq->iv_sector);
ed04d981
MB		 672 u8 *src;
673 int r = 0;
674
675 /* Remove whitening from ciphertext */
676 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
ef43aa38
MB		 677 sg = crypt_get_sg_data(cc, dmreq->sg_in);
678 src = kmap_atomic(sg_page(sg));
679 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
ed04d981
MB		 680 kunmap_atomic(src);
681 }
682
683 /* Calculate IV */
45fe93df 684 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
ed04d981 685 if (cc->iv_size > 8)
45fe93df
AB		 686 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
687 cc->iv_size - 8);
ed04d981
MB		 688
689 return r;
690}
691
692static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
693 struct dm_crypt_request *dmreq)
694{
ef43aa38 695 struct scatterlist *sg;
ed04d981
MB		 696 u8 *dst;
697 int r;
698
699 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
700 return 0;
701
702 /* Apply whitening on ciphertext */
ef43aa38
MB		 703 sg = crypt_get_sg_data(cc, dmreq->sg_out);
704 dst = kmap_atomic(sg_page(sg));
705 r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset);
ed04d981
MB		 706 kunmap_atomic(dst);
707
708 return r;
709}
710
ef43aa38
MB		 711static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
712 struct dm_crypt_request *dmreq)
713{
714 /* Used only for writes, there must be an additional space to store IV */
715 get_random_bytes(iv, cc->iv_size);
716 return 0;
717}
718
b9411d73
MB		 719static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti,
720 const char *opts)
721{
3fd53533 722 if (crypt_integrity_aead(cc)) {
39d13a1a
AB		 723 ti->error = "AEAD transforms not supported for EBOIV";
724 return -EINVAL;
b9411d73
MB		 725 }
726
39d13a1a 727 if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) {
b9411d73
MB		 728 ti->error = "Block size of EBOIV cipher does "
729 "not match IV size of block cipher";
b9411d73
MB		 730 return -EINVAL;
731 }
732
b9411d73
MB		 733 return 0;
734}
735
39d13a1a
AB		 736static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
737 struct dm_crypt_request *dmreq)
b9411d73 738{
39d13a1a
AB		 739 u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64));
740 struct skcipher_request *req;
741 struct scatterlist src, dst;
742 struct crypto_wait wait;
b9411d73
MB		 743 int err;
744
9402e959 745 req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO);
39d13a1a
AB		 746 if (!req)
747 return -ENOMEM;
b9411d73 748
39d13a1a
AB		 749 memset(buf, 0, cc->iv_size);
750 *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
b9411d73 751
39d13a1a
AB		 752 sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size);
753 sg_init_one(&dst, iv, cc->iv_size);
754 skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf);
755 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
756 err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
757 skcipher_request_free(req);
b9411d73 758
39d13a1a 759 return err;
b9411d73
MB		 760}
761
bbb16584
MB		 762static void crypt_iv_elephant_dtr(struct crypt_config *cc)
763{
764 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
765
766 crypto_free_skcipher(elephant->tfm);
767 elephant->tfm = NULL;
768}
769
770static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti,
771 const char *opts)
772{
773 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
774 int r;
775
776 elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);
777 if (IS_ERR(elephant->tfm)) {
778 r = PTR_ERR(elephant->tfm);
779 elephant->tfm = NULL;
780 return r;
781 }
782
783 r = crypt_iv_eboiv_ctr(cc, ti, NULL);
784 if (r)
785 crypt_iv_elephant_dtr(cc);
786 return r;
787}
788
789static void diffuser_disk_to_cpu(u32 *d, size_t n)
790{
791#ifndef __LITTLE_ENDIAN
792 int i;
793
794 for (i = 0; i < n; i++)
795 d[i] = le32_to_cpu((__le32)d[i]);
796#endif
797}
798
799static void diffuser_cpu_to_disk(__le32 *d, size_t n)
800{
801#ifndef __LITTLE_ENDIAN
802 int i;
803
804 for (i = 0; i < n; i++)
805 d[i] = cpu_to_le32((u32)d[i]);
806#endif
807}
808
809static void diffuser_a_decrypt(u32 *d, size_t n)
810{
811 int i, i1, i2, i3;
812
813 for (i = 0; i < 5; i++) {
814 i1 = 0;
815 i2 = n - 2;
816 i3 = n - 5;
817
818 while (i1 < (n - 1)) {
819 d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
820 i1++; i2++; i3++;
821
822 if (i3 >= n)
823 i3 -= n;
824
825 d[i1] += d[i2] ^ d[i3];
826 i1++; i2++; i3++;
827
828 if (i2 >= n)
829 i2 -= n;
830
831 d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
832 i1++; i2++; i3++;
833
834 d[i1] += d[i2] ^ d[i3];
835 i1++; i2++; i3++;
836 }
837 }
838}
839
840static void diffuser_a_encrypt(u32 *d, size_t n)
841{
842 int i, i1, i2, i3;
843
844 for (i = 0; i < 5; i++) {
845 i1 = n - 1;
846 i2 = n - 2 - 1;
847 i3 = n - 5 - 1;
848
849 while (i1 > 0) {
850 d[i1] -= d[i2] ^ d[i3];
851 i1--; i2--; i3--;
852
853 d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19);
854 i1--; i2--; i3--;
855
856 if (i2 < 0)
857 i2 += n;
858
859 d[i1] -= d[i2] ^ d[i3];
860 i1--; i2--; i3--;
861
862 if (i3 < 0)
863 i3 += n;
864
865 d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23);
866 i1--; i2--; i3--;
867 }
868 }
869}
870
871static void diffuser_b_decrypt(u32 *d, size_t n)
872{
873 int i, i1, i2, i3;
874
875 for (i = 0; i < 3; i++) {
876 i1 = 0;
877 i2 = 2;
878 i3 = 5;
879
880 while (i1 < (n - 1)) {
881 d[i1] += d[i2] ^ d[i3];
882 i1++; i2++; i3++;
883
884 d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
885 i1++; i2++; i3++;
886
887 if (i2 >= n)
888 i2 -= n;
889
890 d[i1] += d[i2] ^ d[i3];
891 i1++; i2++; i3++;
892
893 if (i3 >= n)
894 i3 -= n;
895
896 d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
897 i1++; i2++; i3++;
898 }
899 }
900}
901
902static void diffuser_b_encrypt(u32 *d, size_t n)
903{
904 int i, i1, i2, i3;
905
906 for (i = 0; i < 3; i++) {
907 i1 = n - 1;
908 i2 = 2 - 1;
909 i3 = 5 - 1;
910
911 while (i1 > 0) {
912 d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7);
913 i1--; i2--; i3--;
914
915 if (i3 < 0)
916 i3 += n;
917
918 d[i1] -= d[i2] ^ d[i3];
919 i1--; i2--; i3--;
920
921 if (i2 < 0)
922 i2 += n;
923
924 d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22);
925 i1--; i2--; i3--;
926
927 d[i1] -= d[i2] ^ d[i3];
928 i1--; i2--; i3--;
929 }
930 }
931}
932
933static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq)
934{
935 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
936 u8 *es, *ks, *data, *data2, *data_offset;
937 struct skcipher_request *req;
938 struct scatterlist *sg, *sg2, src, dst;
939 struct crypto_wait wait;
940 int i, r;
941
942 req = skcipher_request_alloc(elephant->tfm, GFP_NOIO);
943 es = kzalloc(16, GFP_NOIO); /* Key for AES */
944 ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */
945
946 if (!req || !es || !ks) {
947 r = -ENOMEM;
948 goto out;
949 }
950
951 *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
952
953 /* E(Ks, e(s)) */
954 sg_init_one(&src, es, 16);
955 sg_init_one(&dst, ks, 16);
956 skcipher_request_set_crypt(req, &src, &dst, 16, NULL);
957 skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
958 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
959 if (r)
960 goto out;
961
962 /* E(Ks, e'(s)) */
963 es[15] = 0x80;
964 sg_init_one(&dst, &ks[16], 16);
965 r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
966 if (r)
967 goto out;
968
969 sg = crypt_get_sg_data(cc, dmreq->sg_out);
970 data = kmap_atomic(sg_page(sg));
971 data_offset = data + sg->offset;
972
973 /* Cannot modify original bio, copy to sg_out and apply Elephant to it */
974 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
975 sg2 = crypt_get_sg_data(cc, dmreq->sg_in);
976 data2 = kmap_atomic(sg_page(sg2));
977 memcpy(data_offset, data2 + sg2->offset, cc->sector_size);
978 kunmap_atomic(data2);
979 }
980
981 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
982 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
983 diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
984 diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
985 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
986 }
987
988 for (i = 0; i < (cc->sector_size / 32); i++)
989 crypto_xor(data_offset + i * 32, ks, 32);
990
991 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
992 diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32));
993 diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
994 diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32));
995 diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32));
996 }
997
998 kunmap_atomic(data);
999out:
453431a5
WL		 1000 kfree_sensitive(ks);
1001 kfree_sensitive(es);
bbb16584
MB		 1002 skcipher_request_free(req);
1003 return r;
1004}
1005
1006static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv,
1007 struct dm_crypt_request *dmreq)
1008{
1009 int r;
1010
1011 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
1012 r = crypt_iv_elephant(cc, dmreq);
1013 if (r)
1014 return r;
1015 }
1016
1017 return crypt_iv_eboiv_gen(cc, iv, dmreq);
1018}
1019
1020static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv,
1021 struct dm_crypt_request *dmreq)
1022{
1023 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
1024 return crypt_iv_elephant(cc, dmreq);
1025
1026 return 0;
1027}
1028
1029static int crypt_iv_elephant_init(struct crypt_config *cc)
1030{
1031 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1032 int key_offset = cc->key_size - cc->key_extra_size;
1033
1034 return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size);
1035}
1036
1037static int crypt_iv_elephant_wipe(struct crypt_config *cc)
1038{
1039 struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant;
1040 u8 key[ELEPHANT_MAX_KEY_SIZE];
1041
1042 memset(key, 0, cc->key_extra_size);
1043 return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size);
1044}
1045
1b1b58f5 1046static const struct crypt_iv_operations crypt_iv_plain_ops = {
1da177e4
LT		 1047 .generator = crypt_iv_plain_gen
1048};
1049
1b1b58f5 1050static const struct crypt_iv_operations crypt_iv_plain64_ops = {
61afef61
MB		 1051 .generator = crypt_iv_plain64_gen
1052};
1053
7e3fd855
MB		 1054static const struct crypt_iv_operations crypt_iv_plain64be_ops = {
1055 .generator = crypt_iv_plain64be_gen
1056};
1057
1b1b58f5 1058static const struct crypt_iv_operations crypt_iv_essiv_ops = {
1da177e4
LT		 1059 .generator = crypt_iv_essiv_gen
1060};
1061
1b1b58f5 1062static const struct crypt_iv_operations crypt_iv_benbi_ops = {
48527fa7
RS		 1063 .ctr = crypt_iv_benbi_ctr,
1064 .dtr = crypt_iv_benbi_dtr,
1065 .generator = crypt_iv_benbi_gen
1066};
1da177e4 1067
1b1b58f5 1068static const struct crypt_iv_operations crypt_iv_null_ops = {
46b47730
LN		 1069 .generator = crypt_iv_null_gen
1070};
1071
1b1b58f5 1072static const struct crypt_iv_operations crypt_iv_lmk_ops = {
34745785
MB		 1073 .ctr = crypt_iv_lmk_ctr,
1074 .dtr = crypt_iv_lmk_dtr,
1075 .init = crypt_iv_lmk_init,
1076 .wipe = crypt_iv_lmk_wipe,
1077 .generator = crypt_iv_lmk_gen,
1078 .post = crypt_iv_lmk_post
1079};
1080
1b1b58f5 1081static const struct crypt_iv_operations crypt_iv_tcw_ops = {
ed04d981
MB		 1082 .ctr = crypt_iv_tcw_ctr,
1083 .dtr = crypt_iv_tcw_dtr,
1084 .init = crypt_iv_tcw_init,
1085 .wipe = crypt_iv_tcw_wipe,
1086 .generator = crypt_iv_tcw_gen,
1087 .post = crypt_iv_tcw_post
1088};
1089
ef43aa38
MB		 1090static struct crypt_iv_operations crypt_iv_random_ops = {
1091 .generator = crypt_iv_random_gen
1092};
1093
b9411d73
MB		 1094static struct crypt_iv_operations crypt_iv_eboiv_ops = {
1095 .ctr = crypt_iv_eboiv_ctr,
b9411d73
MB		 1096 .generator = crypt_iv_eboiv_gen
1097};
1098
bbb16584
MB		 1099static struct crypt_iv_operations crypt_iv_elephant_ops = {
1100 .ctr = crypt_iv_elephant_ctr,
1101 .dtr = crypt_iv_elephant_dtr,
1102 .init = crypt_iv_elephant_init,
1103 .wipe = crypt_iv_elephant_wipe,
1104 .generator = crypt_iv_elephant_gen,
1105 .post = crypt_iv_elephant_post
1106};
1107
ef43aa38
MB		 1108/*
1109 * Integrity extensions
1110 */
1111static bool crypt_integrity_aead(struct crypt_config *cc)
1112{
1113 return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
1114}
1115
1116static bool crypt_integrity_hmac(struct crypt_config *cc)
1117{
33d2f09f 1118 return crypt_integrity_aead(cc) && cc->key_mac_size;
ef43aa38
MB		 1119}
1120
1121/* Get sg containing data */
1122static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc,
1123 struct scatterlist *sg)
1124{
33d2f09f 1125 if (unlikely(crypt_integrity_aead(cc)))
ef43aa38
MB		 1126 return &sg[2];
1127
1128 return sg;
1129}
1130
1131static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio)
1132{
1133 struct bio_integrity_payload *bip;
1134 unsigned int tag_len;
1135 int ret;
1136
1137 if (!bio_sectors(bio) || !io->cc->on_disk_tag_size)
1138 return 0;
1139
1140 bip = bio_integrity_alloc(bio, GFP_NOIO, 1);
1141 if (IS_ERR(bip))
1142 return PTR_ERR(bip);
1143
ff0c129d 1144 tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift);
ef43aa38
MB		 1145
1146 bip->bip_iter.bi_size = tag_len;
1147 bip->bip_iter.bi_sector = io->cc->start + io->sector;
1148
ef43aa38
MB		 1149 ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata),
1150 tag_len, offset_in_page(io->integrity_metadata));
1151 if (unlikely(ret != tag_len))
1152 return -ENOMEM;
1153
1154 return 0;
1155}
1156
1157static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti)
1158{
1159#ifdef CONFIG_BLK_DEV_INTEGRITY
1160 struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk);
7a1cd723 1161 struct mapped_device *md = dm_table_get_md(ti->table);
ef43aa38
MB		 1162
1163 /* From now we require underlying device with our integrity profile */
1164 if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) {
1165 ti->error = "Integrity profile not supported.";
1166 return -EINVAL;
1167 }
1168
583fe747
MP		 1169 if (bi->tag_size != cc->on_disk_tag_size ||
1170 bi->tuple_size != cc->on_disk_tag_size) {
ef43aa38
MB		 1171 ti->error = "Integrity profile tag size mismatch.";
1172 return -EINVAL;
1173 }
583fe747
MP		 1174 if (1 << bi->interval_exp != cc->sector_size) {
1175 ti->error = "Integrity profile sector size mismatch.";
1176 return -EINVAL;
1177 }
ef43aa38 1178
33d2f09f 1179 if (crypt_integrity_aead(cc)) {
ef43aa38 1180 cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size;
7a1cd723 1181 DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md),
ef43aa38
MB		 1182 cc->integrity_tag_size, cc->integrity_iv_size);
1183
1184 if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) {
1185 ti->error = "Integrity AEAD auth tag size is not supported.";
1186 return -EINVAL;
1187 }
1188 } else if (cc->integrity_iv_size)
7a1cd723 1189 DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md),
ef43aa38
MB		 1190 cc->integrity_iv_size);
1191
1192 if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) {
1193 ti->error = "Not enough space for integrity tag in the profile.";
1194 return -EINVAL;
1195 }
1196
1197 return 0;
1198#else
1199 ti->error = "Integrity profile not supported.";
1200 return -EINVAL;
1201#endif
1202}
1203
d469f841
MB		 1204static void crypt_convert_init(struct crypt_config *cc,
1205 struct convert_context *ctx,
1206 struct bio *bio_out, struct bio *bio_in,
fcd369da 1207 sector_t sector)
1da177e4
LT		 1208{
1209 ctx->bio_in = bio_in;
1210 ctx->bio_out = bio_out;
003b5c57
KO		 1211 if (bio_in)
1212 ctx->iter_in = bio_in->bi_iter;
1213 if (bio_out)
1214 ctx->iter_out = bio_out->bi_iter;
c66029f4 1215 ctx->cc_sector = sector + cc->iv_offset;
43d69034 1216 init_completion(&ctx->restart);
1da177e4
LT		 1217}
1218
b2174eeb 1219static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
ef43aa38 1220 void *req)
b2174eeb
HY		 1221{
1222 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
1223}
1224
ef43aa38 1225static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq)
b2174eeb 1226{
ef43aa38 1227 return (void *)((char *)dmreq - cc->dmreq_start);
b2174eeb
HY		 1228}
1229
2dc5327d
MB		 1230static u8 *iv_of_dmreq(struct crypt_config *cc,
1231 struct dm_crypt_request *dmreq)
1232{
33d2f09f 1233 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1234 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1235 crypto_aead_alignmask(any_tfm_aead(cc)) + 1);
1236 else
1237 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
1238 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
2dc5327d
MB		 1239}
1240
ef43aa38
MB		 1241static u8 *org_iv_of_dmreq(struct crypt_config *cc,
1242 struct dm_crypt_request *dmreq)
1243{
1244 return iv_of_dmreq(cc, dmreq) + cc->iv_size;
1245}
1246
c13b5487 1247static __le64 *org_sector_of_dmreq(struct crypt_config *cc,
ef43aa38
MB		 1248 struct dm_crypt_request *dmreq)
1249{
1250 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size;
c13b5487 1251 return (__le64 *) ptr;
ef43aa38
MB		 1252}
1253
1254static unsigned int *org_tag_of_dmreq(struct crypt_config *cc,
1255 struct dm_crypt_request *dmreq)
1256{
1257 u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size +
1258 cc->iv_size + sizeof(uint64_t);
1259 return (unsigned int*)ptr;
1260}
1261
1262static void *tag_from_dmreq(struct crypt_config *cc,
1263 struct dm_crypt_request *dmreq)
1264{
1265 struct convert_context *ctx = dmreq->ctx;
1266 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
1267
1268 return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) *
1269 cc->on_disk_tag_size];
1270}
1271
1272static void *iv_tag_from_dmreq(struct crypt_config *cc,
1273 struct dm_crypt_request *dmreq)
1274{
1275 return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size;
1276}
1277
1278static int crypt_convert_block_aead(struct crypt_config *cc,
1279 struct convert_context *ctx,
1280 struct aead_request *req,
1281 unsigned int tag_offset)
01482b76 1282{
003b5c57
KO		 1283 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1284 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
3a7f6c99 1285 struct dm_crypt_request *dmreq;
ef43aa38 1286 u8 *iv, *org_iv, *tag_iv, *tag;
c13b5487 1287 __le64 *sector;
ef43aa38
MB		 1288 int r = 0;
1289
1290 BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
3a7f6c99 1291
8f0009a2 1292 /* Reject unexpected unaligned bio. */
0440d5c0 1293 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2 1294 return -EIO;
3a7f6c99 1295
b2174eeb 1296 dmreq = dmreq_of_req(cc, req);
ef43aa38 1297 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1298 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1299 dmreq->iv_sector >>= cc->sector_shift;
ef43aa38
MB		 1300 dmreq->ctx = ctx;
1301
1302 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1303
1304 sector = org_sector_of_dmreq(cc, dmreq);
1305 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1306
2dc5327d 1307 iv = iv_of_dmreq(cc, dmreq);
ef43aa38
MB		 1308 org_iv = org_iv_of_dmreq(cc, dmreq);
1309 tag = tag_from_dmreq(cc, dmreq);
1310 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1311
1312 /* AEAD request:
1313 * |----- AAD -------|------ DATA -------|-- AUTH TAG --|
1314 * | (authenticated) | (auth+encryption) | |
1315 * | sector_LE | IV | sector in/out | tag in/out |
1316 */
1317 sg_init_table(dmreq->sg_in, 4);
1318 sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t));
1319 sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size);
8f0009a2 1320 sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1321 sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size);
1322
1323 sg_init_table(dmreq->sg_out, 4);
1324 sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t));
1325 sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size);
8f0009a2 1326 sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
ef43aa38
MB		 1327 sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size);
1328
1329 if (cc->iv_gen_ops) {
1330 /* For READs use IV stored in integrity metadata */
1331 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1332 memcpy(org_iv, tag_iv, cc->iv_size);
1333 } else {
1334 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1335 if (r < 0)
1336 return r;
1337 /* Store generated IV in integrity metadata */
1338 if (cc->integrity_iv_size)
1339 memcpy(tag_iv, org_iv, cc->iv_size);
1340 }
1341 /* Working copy of IV, to be modified in crypto API */
1342 memcpy(iv, org_iv, cc->iv_size);
1343 }
1344
1345 aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size);
1346 if (bio_data_dir(ctx->bio_in) == WRITE) {
1347 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1348 cc->sector_size, iv);
ef43aa38
MB		 1349 r = crypto_aead_encrypt(req);
1350 if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size)
1351 memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0,
1352 cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size));
1353 } else {
1354 aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out,
8f0009a2 1355 cc->sector_size + cc->integrity_tag_size, iv);
ef43aa38
MB		 1356 r = crypto_aead_decrypt(req);
1357 }
1358
f710126c
MB		 1359 if (r == -EBADMSG) {
1360 char b[BDEVNAME_SIZE];
1361 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 1362 (unsigned long long)le64_to_cpu(*sector));
f710126c 1363 }
ef43aa38
MB		 1364
1365 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
1366 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1367
8f0009a2
MB		 1368 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1369 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
01482b76 1370
ef43aa38
MB		 1371 return r;
1372}
1373
1374static int crypt_convert_block_skcipher(struct crypt_config *cc,
1375 struct convert_context *ctx,
1376 struct skcipher_request *req,
1377 unsigned int tag_offset)
1378{
1379 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
1380 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
1381 struct scatterlist *sg_in, *sg_out;
1382 struct dm_crypt_request *dmreq;
ef43aa38 1383 u8 *iv, *org_iv, *tag_iv;
c13b5487 1384 __le64 *sector;
ef43aa38 1385 int r = 0;
01482b76 1386
8f0009a2 1387 /* Reject unexpected unaligned bio. */
0440d5c0 1388 if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
8f0009a2
MB		 1389 return -EIO;
1390
ef43aa38 1391 dmreq = dmreq_of_req(cc, req);
c66029f4 1392 dmreq->iv_sector = ctx->cc_sector;
8f0009a2 1393 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
ff3af92b 1394 dmreq->iv_sector >>= cc->sector_shift;
b2174eeb 1395 dmreq->ctx = ctx;
01482b76 1396
ef43aa38
MB		 1397 *org_tag_of_dmreq(cc, dmreq) = tag_offset;
1398
1399 iv = iv_of_dmreq(cc, dmreq);
1400 org_iv = org_iv_of_dmreq(cc, dmreq);
1401 tag_iv = iv_tag_from_dmreq(cc, dmreq);
1402
1403 sector = org_sector_of_dmreq(cc, dmreq);
1404 *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset);
1405
1406 /* For skcipher we use only the first sg item */
1407 sg_in = &dmreq->sg_in[0];
1408 sg_out = &dmreq->sg_out[0];
01482b76 1409
ef43aa38 1410 sg_init_table(sg_in, 1);
8f0009a2 1411 sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset);
ef43aa38
MB		 1412
1413 sg_init_table(sg_out, 1);
8f0009a2 1414 sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset);
01482b76 1415
3a7f6c99 1416 if (cc->iv_gen_ops) {
ef43aa38
MB		 1417 /* For READs use IV stored in integrity metadata */
1418 if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) {
1419 memcpy(org_iv, tag_iv, cc->integrity_iv_size);
1420 } else {
1421 r = cc->iv_gen_ops->generator(cc, org_iv, dmreq);
1422 if (r < 0)
1423 return r;
bbb16584
MB		 1424 /* Data can be already preprocessed in generator */
1425 if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags))
1426 sg_in = sg_out;
ef43aa38
MB		 1427 /* Store generated IV in integrity metadata */
1428 if (cc->integrity_iv_size)
1429 memcpy(tag_iv, org_iv, cc->integrity_iv_size);
1430 }
1431 /* Working copy of IV, to be modified in crypto API */
1432 memcpy(iv, org_iv, cc->iv_size);
3a7f6c99
MB		 1433 }
1434
8f0009a2 1435 skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv);
3a7f6c99
MB		 1436
1437 if (bio_data_dir(ctx->bio_in) == WRITE)
bbdb23b5 1438 r = crypto_skcipher_encrypt(req);
3a7f6c99 1439 else
bbdb23b5 1440 r = crypto_skcipher_decrypt(req);
3a7f6c99 1441
2dc5327d 1442 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38
MB		 1443 r = cc->iv_gen_ops->post(cc, org_iv, dmreq);
1444
8f0009a2
MB		 1445 bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size);
1446 bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
2dc5327d 1447
3a7f6c99 1448 return r;
01482b76
MB		 1449}
1450
95497a96
MB		 1451static void kcryptd_async_done(struct crypto_async_request *async_req,
1452 int error);
c0297721 1453
ef43aa38
MB		 1454static void crypt_alloc_req_skcipher(struct crypt_config *cc,
1455 struct convert_context *ctx)
ddd42edf 1456{
c66029f4 1457 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
c0297721 1458
ef43aa38 1459 if (!ctx->r.req)
6f1c819c 1460 ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1461
ef43aa38 1462 skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]);
54cea3f6
MB		 1463
1464 /*
1465 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1466 * requests if driver request queue is full.
1467 */
ef43aa38 1468 skcipher_request_set_callback(ctx->r.req,
432061b3 1469 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38 1470 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req));
ddd42edf
MB		 1471}
1472
ef43aa38
MB		 1473static void crypt_alloc_req_aead(struct crypt_config *cc,
1474 struct convert_context *ctx)
1475{
1476 if (!ctx->r.req_aead)
6f1c819c 1477 ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO);
c0297721 1478
ef43aa38 1479 aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]);
54cea3f6
MB		 1480
1481 /*
1482 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
1483 * requests if driver request queue is full.
1484 */
ef43aa38 1485 aead_request_set_callback(ctx->r.req_aead,
432061b3 1486 CRYPTO_TFM_REQ_MAY_BACKLOG,
ef43aa38
MB		 1487 kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead));
1488}
1489
1490static void crypt_alloc_req(struct crypt_config *cc,
1491 struct convert_context *ctx)
1492{
33d2f09f 1493 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1494 crypt_alloc_req_aead(cc, ctx);
1495 else
1496 crypt_alloc_req_skcipher(cc, ctx);
ddd42edf
MB		 1497}
1498
ef43aa38
MB		 1499static void crypt_free_req_skcipher(struct crypt_config *cc,
1500 struct skcipher_request *req, struct bio *base_bio)
298a9fa0
MP		 1501{
1502 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1503
bbdb23b5 1504 if ((struct skcipher_request *)(io + 1) != req)
6f1c819c 1505 mempool_free(req, &cc->req_pool);
298a9fa0
MP		 1506}
1507
ef43aa38
MB		 1508static void crypt_free_req_aead(struct crypt_config *cc,
1509 struct aead_request *req, struct bio *base_bio)
1510{
1511 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
1512
1513 if ((struct aead_request *)(io + 1) != req)
6f1c819c 1514 mempool_free(req, &cc->req_pool);
ef43aa38
MB		 1515}
1516
1517static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio)
1518{
33d2f09f 1519 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1520 crypt_free_req_aead(cc, req, base_bio);
1521 else
1522 crypt_free_req_skcipher(cc, req, base_bio);
1523}
1524
1da177e4
LT		 1525/*
1526 * Encrypt / decrypt data from one bio to another one (can be the same one)
1527 */
4e4cbee9 1528static blk_status_t crypt_convert(struct crypt_config *cc,
39d42fa9 1529 struct convert_context *ctx, bool atomic)
1da177e4 1530{
ef43aa38 1531 unsigned int tag_offset = 0;
ff3af92b 1532 unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
3f1e9070 1533 int r;
1da177e4 1534
40b6229b 1535 atomic_set(&ctx->cc_pending, 1);
c8081618 1536
003b5c57 1537 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
1da177e4 1538
3a7f6c99 1539 crypt_alloc_req(cc, ctx);
40b6229b 1540 atomic_inc(&ctx->cc_pending);
3f1e9070 1541
33d2f09f 1542 if (crypt_integrity_aead(cc))
ef43aa38
MB		 1543 r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
1544 else
1545 r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
3a7f6c99
MB		 1546
1547 switch (r) {
54cea3f6
MB		 1548 /*
1549 * The request was queued by a crypto driver
1550 * but the driver request queue is full, let's wait.
1551 */
3a7f6c99
MB		 1552 case -EBUSY:
1553 wait_for_completion(&ctx->restart);
16735d02 1554 reinit_completion(&ctx->restart);
54cea3f6
MB		 1555 /* fall through */
1556 /*
1557 * The request is queued and processed asynchronously,
1558 * completion function kcryptd_async_done() will be called.
1559 */
c0403ec0 1560 case -EINPROGRESS:
ef43aa38 1561 ctx->r.req = NULL;
8f0009a2 1562 ctx->cc_sector += sector_step;
583fe747 1563 tag_offset++;
3f1e9070 1564 continue;
54cea3f6
MB		 1565 /*
1566 * The request was already processed (synchronously).
1567 */
3a7f6c99 1568 case 0:
40b6229b 1569 atomic_dec(&ctx->cc_pending);
8f0009a2 1570 ctx->cc_sector += sector_step;
583fe747 1571 tag_offset++;
39d42fa9
IK		 1572 if (!atomic)
1573 cond_resched();
3a7f6c99 1574 continue;
ef43aa38
MB		 1575 /*
1576 * There was a data integrity error.
1577 */
1578 case -EBADMSG:
1579 atomic_dec(&ctx->cc_pending);
4e4cbee9 1580 return BLK_STS_PROTECTION;
ef43aa38
MB		 1581 /*
1582 * There was an error while processing the request.
1583 */
3f1e9070 1584 default:
40b6229b 1585 atomic_dec(&ctx->cc_pending);
4e4cbee9 1586 return BLK_STS_IOERR;
3f1e9070 1587 }
1da177e4
LT		 1588 }
1589
3f1e9070 1590 return 0;
1da177e4
LT		 1591}
1592
cf2f1abf
MP		 1593static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
1594
1da177e4
LT		 1595/*
1596 * Generate a new unfragmented bio with the given size
586b286b
MS		 1597 * This should never violate the device limitations (but only because
1598 * max_segment_size is being constrained to PAGE_SIZE).
7145c241
MP		 1599 *
1600 * This function may be called concurrently. If we allocate from the mempool
1601 * concurrently, there is a possibility of deadlock. For example, if we have
1602 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
1603 * the mempool concurrently, it may deadlock in a situation where both processes
1604 * have allocated 128 pages and the mempool is exhausted.
1605 *
1606 * In order to avoid this scenario we allocate the pages under a mutex.
1607 *
1608 * In order to not degrade performance with excessive locking, we try
1609 * non-blocking allocations without a mutex first but on failure we fallback
1610 * to blocking allocations with a mutex.
1da177e4 1611 */
cf2f1abf 1612static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
1da177e4 1613{
49a8a920 1614 struct crypt_config *cc = io->cc;
8b004457 1615 struct bio *clone;
1da177e4 1616 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
7145c241
MP		 1617 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
1618 unsigned i, len, remaining_size;
91e10625 1619 struct page *page;
1da177e4 1620
7145c241 1621retry:
d0164adc 1622 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1623 mutex_lock(&cc->bio_alloc_lock);
1624
6f1c819c 1625 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs);
8b004457 1626 if (!clone)
ef43aa38 1627 goto out;
1da177e4 1628
027581f3 1629 clone_init(io, clone);
6a24c718 1630
7145c241
MP		 1631 remaining_size = size;
1632
f97380bc 1633 for (i = 0; i < nr_iovecs; i++) {
6f1c819c 1634 page = mempool_alloc(&cc->page_pool, gfp_mask);
7145c241
MP		 1635 if (!page) {
1636 crypt_free_buffer_pages(cc, clone);
1637 bio_put(clone);
d0164adc 1638 gfp_mask |= __GFP_DIRECT_RECLAIM;
7145c241
MP		 1639 goto retry;
1640 }
1da177e4 1641
7145c241 1642 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
91e10625 1643
0dae7fe5 1644 bio_add_page(clone, page, len, 0);
1da177e4 1645
7145c241 1646 remaining_size -= len;
1da177e4
LT		 1647 }
1648
ef43aa38
MB		 1649 /* Allocate space for integrity tags */
1650 if (dm_crypt_integrity_io_alloc(io, clone)) {
1651 crypt_free_buffer_pages(cc, clone);
1652 bio_put(clone);
1653 clone = NULL;
1654 }
1655out:
d0164adc 1656 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
7145c241
MP		 1657 mutex_unlock(&cc->bio_alloc_lock);
1658
8b004457 1659 return clone;
1da177e4
LT		 1660}
1661
644bd2f0 1662static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
1da177e4 1663{
1da177e4 1664 struct bio_vec *bv;
6dc4f100 1665 struct bvec_iter_all iter_all;
1da177e4 1666
2b070cfe 1667 bio_for_each_segment_all(bv, clone, iter_all) {
1da177e4 1668 BUG_ON(!bv->bv_page);
6f1c819c 1669 mempool_free(bv->bv_page, &cc->page_pool);
1da177e4
LT		 1670 }
1671}
1672
298a9fa0
MP		 1673static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1674 struct bio *bio, sector_t sector)
dc440d1e 1675{
49a8a920 1676 io->cc = cc;
dc440d1e
MB		 1677 io->base_bio = bio;
1678 io->sector = sector;
1679 io->error = 0;
ef43aa38
MB		 1680 io->ctx.r.req = NULL;
1681 io->integrity_metadata = NULL;
1682 io->integrity_metadata_from_pool = false;
40b6229b 1683 atomic_set(&io->io_pending, 0);
dc440d1e
MB		 1684}
1685
3e1a8bdd
MB		 1686static void crypt_inc_pending(struct dm_crypt_io *io)
1687{
40b6229b 1688 atomic_inc(&io->io_pending);
3e1a8bdd
MB		 1689}
1690
1da177e4
LT		 1691/*
1692 * One of the bios was finished. Check for completion of
1693 * the whole request and correctly clean up the buffer.
1694 */
5742fd77 1695static void crypt_dec_pending(struct dm_crypt_io *io)
1da177e4 1696{
49a8a920 1697 struct crypt_config *cc = io->cc;
b35f8caa 1698 struct bio *base_bio = io->base_bio;
4e4cbee9 1699 blk_status_t error = io->error;
1da177e4 1700
40b6229b 1701 if (!atomic_dec_and_test(&io->io_pending))
1da177e4
LT		 1702 return;
1703
ef43aa38
MB		 1704 if (io->ctx.r.req)
1705 crypt_free_req(cc, io->ctx.r.req, base_bio);
1706
1707 if (unlikely(io->integrity_metadata_from_pool))
6f1c819c 1708 mempool_free(io->integrity_metadata, &io->cc->tag_pool);
ef43aa38
MB		 1709 else
1710 kfree(io->integrity_metadata);
b35f8caa 1711
4e4cbee9 1712 base_bio->bi_status = error;
4246a0b6 1713 bio_endio(base_bio);
1da177e4
LT		 1714}
1715
1716/*
cabf08e4 1717 * kcryptd/kcryptd_io:
1da177e4
LT		 1718 *
1719 * Needed because it would be very unwise to do decryption in an
23541d2d 1720 * interrupt context.
cabf08e4
MB		 1721 *
1722 * kcryptd performs the actual encryption or decryption.
1723 *
1724 * kcryptd_io performs the IO submission.
1725 *
1726 * They must be separated as otherwise the final stages could be
1727 * starved by new requests which can block in the first stages due
1728 * to memory allocation.
c0297721
AK		 1729 *
1730 * The work is done per CPU global for all dm-crypt instances.
1731 * They should not depend on each other and do not block.
1da177e4 1732 */
4246a0b6 1733static void crypt_endio(struct bio *clone)
8b004457 1734{
028867ac 1735 struct dm_crypt_io *io = clone->bi_private;
49a8a920 1736 struct crypt_config *cc = io->cc;
ee7a491e 1737 unsigned rw = bio_data_dir(clone);
4e4cbee9 1738 blk_status_t error;
8b004457
MB		 1739
1740 /*
6712ecf8 1741 * free the processed pages
8b004457 1742 */
ee7a491e 1743 if (rw == WRITE)
644bd2f0 1744 crypt_free_buffer_pages(cc, clone);
8b004457 1745
4e4cbee9 1746 error = clone->bi_status;
8b004457 1747 bio_put(clone);
8b004457 1748
9b81c842 1749 if (rw == READ && !error) {
ee7a491e
MB		 1750 kcryptd_queue_crypt(io);
1751 return;
1752 }
5742fd77 1753
9b81c842
SL		 1754 if (unlikely(error))
1755 io->error = error;
5742fd77
MB		 1756
1757 crypt_dec_pending(io);
8b004457
MB		 1758}
1759
028867ac 1760static void clone_init(struct dm_crypt_io *io, struct bio *clone)
8b004457 1761{
49a8a920 1762 struct crypt_config *cc = io->cc;
8b004457
MB		 1763
1764 clone->bi_private = io;
1765 clone->bi_end_io = crypt_endio;
74d46992 1766 bio_set_dev(clone, cc->dev->bdev);
ef295ecf 1767 clone->bi_opf = io->base_bio->bi_opf;
8b004457
MB		 1768}
1769
20c82538 1770static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
8b004457 1771{
49a8a920 1772 struct crypt_config *cc = io->cc;
8b004457 1773 struct bio *clone;
93e605c2 1774
8b004457 1775 /*
59779079
MS		 1776 * We need the original biovec array in order to decrypt
1777 * the whole bio data *afterwards* -- thanks to immutable
1778 * biovecs we don't need to worry about the block layer
1779 * modifying the biovec array; so leverage bio_clone_fast().
8b004457 1780 */
6f1c819c 1781 clone = bio_clone_fast(io->base_bio, gfp, &cc->bs);
7eaceacc 1782 if (!clone)
20c82538 1783 return 1;
8b004457 1784
20c82538
MB		 1785 crypt_inc_pending(io);
1786
8b004457 1787 clone_init(io, clone);
4f024f37 1788 clone->bi_iter.bi_sector = cc->start + io->sector;
8b004457 1789
ef43aa38
MB		 1790 if (dm_crypt_integrity_io_alloc(io, clone)) {
1791 crypt_dec_pending(io);
1792 bio_put(clone);
1793 return 1;
1794 }
1795
ed00aabd 1796 submit_bio_noacct(clone);
20c82538 1797 return 0;
8b004457
MB		 1798}
1799
dc267621
MP		 1800static void kcryptd_io_read_work(struct work_struct *work)
1801{
1802 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1803
1804 crypt_inc_pending(io);
1805 if (kcryptd_io_read(io, GFP_NOIO))
4e4cbee9 1806 io->error = BLK_STS_RESOURCE;
dc267621
MP		 1807 crypt_dec_pending(io);
1808}
1809
1810static void kcryptd_queue_read(struct dm_crypt_io *io)
1811{
1812 struct crypt_config *cc = io->cc;
1813
1814 INIT_WORK(&io->work, kcryptd_io_read_work);
1815 queue_work(cc->io_queue, &io->work);
1816}
1817
4e4eef64
MB		 1818static void kcryptd_io_write(struct dm_crypt_io *io)
1819{
95497a96 1820 struct bio *clone = io->ctx.bio_out;
dc267621 1821
ed00aabd 1822 submit_bio_noacct(clone);
4e4eef64
MB		 1823}
1824
b3c5fd30
MP		 1825#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1826
dc267621 1827static int dmcrypt_write(void *data)
395b167c 1828{
dc267621 1829 struct crypt_config *cc = data;
b3c5fd30
MP		 1830 struct dm_crypt_io *io;
1831
dc267621 1832 while (1) {
b3c5fd30 1833 struct rb_root write_tree;
dc267621 1834 struct blk_plug plug;
395b167c 1835
c7329eff 1836 spin_lock_irq(&cc->write_thread_lock);
dc267621 1837continue_locked:
395b167c 1838
b3c5fd30 1839 if (!RB_EMPTY_ROOT(&cc->write_tree))
dc267621
MP		 1840 goto pop_from_list;
1841
f659b100 1842 set_current_state(TASK_INTERRUPTIBLE);
dc267621 1843
c7329eff 1844 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1845
f659b100 1846 if (unlikely(kthread_should_stop())) {
642fa448 1847 set_current_state(TASK_RUNNING);
f659b100
RV		 1848 break;
1849 }
1850
dc267621
MP		 1851 schedule();
1852
642fa448 1853 set_current_state(TASK_RUNNING);
c7329eff 1854 spin_lock_irq(&cc->write_thread_lock);
dc267621
MP		 1855 goto continue_locked;
1856
1857pop_from_list:
b3c5fd30
MP		 1858 write_tree = cc->write_tree;
1859 cc->write_tree = RB_ROOT;
c7329eff 1860 spin_unlock_irq(&cc->write_thread_lock);
dc267621 1861
b3c5fd30
MP		 1862 BUG_ON(rb_parent(write_tree.rb_node));
1863
1864 /*
1865 * Note: we cannot walk the tree here with rb_next because
1866 * the structures may be freed when kcryptd_io_write is called.
1867 */
dc267621
MP		 1868 blk_start_plug(&plug);
1869 do {
b3c5fd30
MP		 1870 io = crypt_io_from_node(rb_first(&write_tree));
1871 rb_erase(&io->rb_node, &write_tree);
dc267621 1872 kcryptd_io_write(io);
b3c5fd30 1873 } while (!RB_EMPTY_ROOT(&write_tree));
dc267621
MP		 1874 blk_finish_plug(&plug);
1875 }
1876 return 0;
395b167c
AK		 1877}
1878
72c6e7af 1879static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
4e4eef64 1880{
dec1cedf 1881 struct bio *clone = io->ctx.bio_out;
49a8a920 1882 struct crypt_config *cc = io->cc;
dc267621 1883 unsigned long flags;
b3c5fd30
MP		 1884 sector_t sector;
1885 struct rb_node **rbp, *parent;
dec1cedf 1886
4e4cbee9 1887 if (unlikely(io->error)) {
dec1cedf
MB		 1888 crypt_free_buffer_pages(cc, clone);
1889 bio_put(clone);
6c031f41 1890 crypt_dec_pending(io);
dec1cedf
MB		 1891 return;
1892 }
1893
1894 /* crypt_convert should have filled the clone bio */
003b5c57 1895 BUG_ON(io->ctx.iter_out.bi_size);
dec1cedf 1896
4f024f37 1897 clone->bi_iter.bi_sector = cc->start + io->sector;
899c95d3 1898
39d42fa9
IK		 1899 if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) ||
1900 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) {
ed00aabd 1901 submit_bio_noacct(clone);
0f5d8e6e
MP		 1902 return;
1903 }
1904
c7329eff
MP		 1905 spin_lock_irqsave(&cc->write_thread_lock, flags);
1906 if (RB_EMPTY_ROOT(&cc->write_tree))
1907 wake_up_process(cc->write_thread);
b3c5fd30
MP		 1908 rbp = &cc->write_tree.rb_node;
1909 parent = NULL;
1910 sector = io->sector;
1911 while (*rbp) {
1912 parent = *rbp;
1913 if (sector < crypt_io_from_node(parent)->sector)
1914 rbp = &(*rbp)->rb_left;
1915 else
1916 rbp = &(*rbp)->rb_right;
1917 }
1918 rb_link_node(&io->rb_node, parent, rbp);
1919 rb_insert_color(&io->rb_node, &cc->write_tree);
c7329eff 1920 spin_unlock_irqrestore(&cc->write_thread_lock, flags);
4e4eef64
MB		 1921}
1922
8e225f04
DLM		 1923static bool kcryptd_crypt_write_inline(struct crypt_config *cc,
1924 struct convert_context *ctx)
1925
1926{
1927 if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags))
1928 return false;
1929
1930 /*
1931 * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering
1932 * constraints so they do not need to be issued inline by
1933 * kcryptd_crypt_write_convert().
1934 */
1935 switch (bio_op(ctx->bio_in)) {
1936 case REQ_OP_WRITE:
1937 case REQ_OP_WRITE_SAME:
1938 case REQ_OP_WRITE_ZEROES:
1939 return true;
1940 default:
1941 return false;
1942 }
1943}
1944
fc5a5e9a 1945static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
8b004457 1946{
49a8a920 1947 struct crypt_config *cc = io->cc;
8e225f04 1948 struct convert_context *ctx = &io->ctx;
8b004457 1949 struct bio *clone;
c8081618 1950 int crypt_finished;
b635b00e 1951 sector_t sector = io->sector;
4e4cbee9 1952 blk_status_t r;
8b004457 1953
fc5a5e9a
MB		 1954 /*
1955 * Prevent io from disappearing until this function completes.
1956 */
1957 crypt_inc_pending(io);
8e225f04 1958 crypt_convert_init(cc, ctx, NULL, io->base_bio, sector);
fc5a5e9a 1959
cf2f1abf
MP		 1960 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1961 if (unlikely(!clone)) {
4e4cbee9 1962 io->error = BLK_STS_IOERR;
cf2f1abf
MP		 1963 goto dec;
1964 }
c8081618 1965
cf2f1abf
MP		 1966 io->ctx.bio_out = clone;
1967 io->ctx.iter_out = clone->bi_iter;
b635b00e 1968
cf2f1abf 1969 sector += bio_sectors(clone);
93e605c2 1970
cf2f1abf 1971 crypt_inc_pending(io);
8e225f04 1972 r = crypt_convert(cc, ctx,
39d42fa9 1973 test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags));
4e4cbee9 1974 if (r)
ef43aa38 1975 io->error = r;
8e225f04
DLM		 1976 crypt_finished = atomic_dec_and_test(&ctx->cc_pending);
1977 if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) {
1978 /* Wait for completion signaled by kcryptd_async_done() */
1979 wait_for_completion(&ctx->restart);
1980 crypt_finished = 1;
1981 }
933f01d4 1982
cf2f1abf
MP		 1983 /* Encryption was already finished, submit io now */
1984 if (crypt_finished) {
1985 kcryptd_crypt_write_io_submit(io, 0);
1986 io->sector = sector;
93e605c2 1987 }
899c95d3 1988
cf2f1abf 1989dec:
899c95d3 1990 crypt_dec_pending(io);
84131db6
MB		 1991}
1992
72c6e7af 1993static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
5742fd77 1994{
5742fd77
MB		 1995 crypt_dec_pending(io);
1996}
1997
4e4eef64 1998static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
8b004457 1999{
49a8a920 2000 struct crypt_config *cc = io->cc;
4e4cbee9 2001 blk_status_t r;
1da177e4 2002
3e1a8bdd 2003 crypt_inc_pending(io);
3a7f6c99 2004
53017030 2005 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
0c395b0f 2006 io->sector);
1da177e4 2007
39d42fa9
IK		 2008 r = crypt_convert(cc, &io->ctx,
2009 test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags));
4e4cbee9 2010 if (r)
ef43aa38 2011 io->error = r;
5742fd77 2012
40b6229b 2013 if (atomic_dec_and_test(&io->ctx.cc_pending))
72c6e7af 2014 kcryptd_crypt_read_done(io);
3a7f6c99
MB		 2015
2016 crypt_dec_pending(io);
1da177e4
LT		 2017}
2018
95497a96
MB		 2019static void kcryptd_async_done(struct crypto_async_request *async_req,
2020 int error)
2021{
b2174eeb
HY		 2022 struct dm_crypt_request *dmreq = async_req->data;
2023 struct convert_context *ctx = dmreq->ctx;
95497a96 2024 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
49a8a920 2025 struct crypt_config *cc = io->cc;
95497a96 2026
54cea3f6
MB		 2027 /*
2028 * A request from crypto driver backlog is going to be processed now,
2029 * finish the completion and continue in crypt_convert().
2030 * (Callback will be called for the second time for this request.)
2031 */
c0403ec0
RV		 2032 if (error == -EINPROGRESS) {
2033 complete(&ctx->restart);
95497a96 2034 return;
c0403ec0 2035 }
95497a96 2036
2dc5327d 2037 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
ef43aa38 2038 error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq);
2dc5327d 2039
ef43aa38 2040 if (error == -EBADMSG) {
f710126c
MB		 2041 char b[BDEVNAME_SIZE];
2042 DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
ef43aa38 2043 (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
4e4cbee9 2044 io->error = BLK_STS_PROTECTION;
ef43aa38 2045 } else if (error < 0)
4e4cbee9 2046 io->error = BLK_STS_IOERR;
72c6e7af 2047
298a9fa0 2048 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
95497a96 2049
40b6229b 2050 if (!atomic_dec_and_test(&ctx->cc_pending))
c0403ec0 2051 return;
95497a96 2052
8e225f04
DLM		 2053 /*
2054 * The request is fully completed: for inline writes, let
2055 * kcryptd_crypt_write_convert() do the IO submission.
2056 */
2057 if (bio_data_dir(io->base_bio) == READ) {
72c6e7af 2058 kcryptd_crypt_read_done(io);
8e225f04
DLM		 2059 return;
2060 }
2061
2062 if (kcryptd_crypt_write_inline(cc, ctx)) {
2063 complete(&ctx->restart);
2064 return;
2065 }
2066
2067 kcryptd_crypt_write_io_submit(io, 1);
95497a96
MB		 2068}
2069
395b167c 2070static void kcryptd_crypt(struct work_struct *work)
1da177e4 2071{
028867ac 2072 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
8b004457 2073
cabf08e4 2074 if (bio_data_dir(io->base_bio) == READ)
395b167c 2075 kcryptd_crypt_read_convert(io);
4e4eef64 2076 else
395b167c 2077 kcryptd_crypt_write_convert(io);
cabf08e4
MB		 2078}
2079
39d42fa9
IK		 2080static void kcryptd_crypt_tasklet(unsigned long work)
2081{
2082 kcryptd_crypt((struct work_struct *)work);
2083}
2084
395b167c 2085static void kcryptd_queue_crypt(struct dm_crypt_io *io)
cabf08e4 2086{
49a8a920 2087 struct crypt_config *cc = io->cc;
cabf08e4 2088
39d42fa9
IK		 2089 if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) ||
2090 (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) {
2091 if (in_irq()) {
2092 /* Crypto API's "skcipher_walk_first() refuses to work in hard IRQ context */
2093 tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work);
2094 tasklet_schedule(&io->tasklet);
2095 return;
2096 }
2097
2098 kcryptd_crypt(&io->work);
2099 return;
2100 }
2101
395b167c
AK		 2102 INIT_WORK(&io->work, kcryptd_crypt);
2103 queue_work(cc->crypt_queue, &io->work);
1da177e4
LT		 2104}
2105
ef43aa38 2106static void crypt_free_tfms_aead(struct crypt_config *cc)
1da177e4 2107{
ef43aa38
MB		 2108 if (!cc->cipher_tfm.tfms_aead)
2109 return;
1da177e4 2110
ef43aa38
MB		 2111 if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2112 crypto_free_aead(cc->cipher_tfm.tfms_aead[0]);
2113 cc->cipher_tfm.tfms_aead[0] = NULL;
1da177e4
LT		 2114 }
2115
ef43aa38
MB		 2116 kfree(cc->cipher_tfm.tfms_aead);
2117 cc->cipher_tfm.tfms_aead = NULL;
1da177e4
LT		 2118}
2119
ef43aa38 2120static void crypt_free_tfms_skcipher(struct crypt_config *cc)
d1f96423 2121{
d1f96423
MB		 2122 unsigned i;
2123
ef43aa38 2124 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2125 return;
2126
d1f96423 2127 for (i = 0; i < cc->tfms_count; i++)
ef43aa38
MB		 2128 if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) {
2129 crypto_free_skcipher(cc->cipher_tfm.tfms[i]);
2130 cc->cipher_tfm.tfms[i] = NULL;
d1f96423 2131 }
fd2d231f 2132
ef43aa38
MB		 2133 kfree(cc->cipher_tfm.tfms);
2134 cc->cipher_tfm.tfms = NULL;
d1f96423
MB		 2135}
2136
ef43aa38
MB		 2137static void crypt_free_tfms(struct crypt_config *cc)
2138{
33d2f09f 2139 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2140 crypt_free_tfms_aead(cc);
2141 else
2142 crypt_free_tfms_skcipher(cc);
2143}
2144
2145static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode)
d1f96423 2146{
d1f96423
MB		 2147 unsigned i;
2148 int err;
2149
6396bb22
KC		 2150 cc->cipher_tfm.tfms = kcalloc(cc->tfms_count,
2151 sizeof(struct crypto_skcipher *),
2152 GFP_KERNEL);
ef43aa38 2153 if (!cc->cipher_tfm.tfms)
fd2d231f
MP		 2154 return -ENOMEM;
2155
d1f96423 2156 for (i = 0; i < cc->tfms_count; i++) {
ef43aa38
MB		 2157 cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
2158 if (IS_ERR(cc->cipher_tfm.tfms[i])) {
2159 err = PTR_ERR(cc->cipher_tfm.tfms[i]);
fd2d231f 2160 crypt_free_tfms(cc);
d1f96423
MB		 2161 return err;
2162 }
2163 }
2164
af331eba
EB		 2165 /*
2166 * dm-crypt performance can vary greatly depending on which crypto
2167 * algorithm implementation is used. Help people debug performance
2168 * problems by logging the ->cra_driver_name.
2169 */
7a1cd723 2170 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2171 crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name);
d1f96423
MB		 2172 return 0;
2173}
2174
ef43aa38
MB		 2175static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode)
2176{
ef43aa38
MB		 2177 int err;
2178
2179 cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL);
2180 if (!cc->cipher_tfm.tfms)
2181 return -ENOMEM;
2182
ef43aa38
MB		 2183 cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0);
2184 if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) {
2185 err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]);
2186 crypt_free_tfms(cc);
2187 return err;
2188 }
2189
7a1cd723 2190 DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode,
af331eba 2191 crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name);
ef43aa38
MB		 2192 return 0;
2193}
2194
2195static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
2196{
33d2f09f 2197 if (crypt_integrity_aead(cc))
ef43aa38
MB		 2198 return crypt_alloc_tfms_aead(cc, ciphermode);
2199 else
2200 return crypt_alloc_tfms_skcipher(cc, ciphermode);
2201}
2202
2203static unsigned crypt_subkey_size(struct crypt_config *cc)
2204{
2205 return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
2206}
2207
2208static unsigned crypt_authenckey_size(struct crypt_config *cc)
2209{
2210 return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param));
2211}
2212
2213/*
2214 * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
2215 * the key must be for some reason in special format.
2216 * This funcion converts cc->key to this special format.
2217 */
2218static void crypt_copy_authenckey(char *p, const void *key,
2219 unsigned enckeylen, unsigned authkeylen)
2220{
2221 struct crypto_authenc_key_param *param;
2222 struct rtattr *rta;
2223
2224 rta = (struct rtattr *)p;
2225 param = RTA_DATA(rta);
2226 param->enckeylen = cpu_to_be32(enckeylen);
2227 rta->rta_len = RTA_LENGTH(sizeof(*param));
2228 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
2229 p += RTA_SPACE(sizeof(*param));
2230 memcpy(p, key + enckeylen, authkeylen);
2231 p += authkeylen;
2232 memcpy(p, key, enckeylen);
2233}
2234
671ea6b4 2235static int crypt_setkey(struct crypt_config *cc)
c0297721 2236{
da31a078 2237 unsigned subkey_size;
fd2d231f
MP		 2238 int err = 0, i, r;
2239
da31a078 2240 /* Ignore extra keys (which are used for IV etc) */
ef43aa38 2241 subkey_size = crypt_subkey_size(cc);
da31a078 2242
27c70036
MB		 2243 if (crypt_integrity_hmac(cc)) {
2244 if (subkey_size < cc->key_mac_size)
2245 return -EINVAL;
2246
ef43aa38
MB		 2247 crypt_copy_authenckey(cc->authenc_key, cc->key,
2248 subkey_size - cc->key_mac_size,
2249 cc->key_mac_size);
27c70036
MB		 2250 }
2251
fd2d231f 2252 for (i = 0; i < cc->tfms_count; i++) {
33d2f09f 2253 if (crypt_integrity_hmac(cc))
ef43aa38
MB		 2254 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2255 cc->authenc_key, crypt_authenckey_size(cc));
33d2f09f
MB		 2256 else if (crypt_integrity_aead(cc))
2257 r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
2258 cc->key + (i * subkey_size),
2259 subkey_size);
ef43aa38
MB		 2260 else
2261 r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
2262 cc->key + (i * subkey_size),
2263 subkey_size);
fd2d231f
MP		 2264 if (r)
2265 err = r;
c0297721
AK		 2266 }
2267
ef43aa38
MB		 2268 if (crypt_integrity_hmac(cc))
2269 memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc));
2270
c0297721
AK		 2271 return err;
2272}
2273
c538f6ec
OK		 2274#ifdef CONFIG_KEYS
2275
027c431c
OK		 2276static bool contains_whitespace(const char *str)
2277{
2278 while (*str)
2279 if (isspace(*str++))
2280 return true;
2281 return false;
2282}
2283
27f5411a
DB		 2284static int set_key_user(struct crypt_config *cc, struct key *key)
2285{
2286 const struct user_key_payload *ukp;
2287
2288 ukp = user_key_payload_locked(key);
2289 if (!ukp)
2290 return -EKEYREVOKED;
2291
2292 if (cc->key_size != ukp->datalen)
2293 return -EINVAL;
2294
2295 memcpy(cc->key, ukp->data, cc->key_size);
2296
2297 return 0;
2298}
2299
2300#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2301static int set_key_encrypted(struct crypt_config *cc, struct key *key)
2302{
2303 const struct encrypted_key_payload *ekp;
2304
2305 ekp = key->payload.data[0];
2306 if (!ekp)
2307 return -EKEYREVOKED;
2308
2309 if (cc->key_size != ekp->decrypted_datalen)
2310 return -EINVAL;
2311
2312 memcpy(cc->key, ekp->decrypted_data, cc->key_size);
2313
2314 return 0;
2315}
2316#endif /* CONFIG_ENCRYPTED_KEYS */
2317
c538f6ec
OK		 2318static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2319{
2320 char *new_key_string, *key_desc;
2321 int ret;
27f5411a 2322 struct key_type *type;
c538f6ec 2323 struct key *key;
27f5411a 2324 int (*set_key)(struct crypt_config *cc, struct key *key);
c538f6ec 2325
027c431c
OK		 2326 /*
2327 * Reject key_string with whitespace. dm core currently lacks code for
2328 * proper whitespace escaping in arguments on DM_TABLE_STATUS path.
2329 */
2330 if (contains_whitespace(key_string)) {
2331 DMERR("whitespace chars not allowed in key string");
2332 return -EINVAL;
2333 }
2334
c538f6ec
OK		 2335 /* look for next ':' separating key_type from key_description */
2336 key_desc = strpbrk(key_string, ":");
2337 if (!key_desc || key_desc == key_string || !strlen(key_desc + 1))
2338 return -EINVAL;
2339
27f5411a
DB		 2340 if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) {
2341 type = &key_type_logon;
2342 set_key = set_key_user;
2343 } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) {
2344 type = &key_type_user;
2345 set_key = set_key_user;
2346#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
2347 } else if (!strncmp(key_string, "encrypted:", key_desc - key_string + 1)) {
2348 type = &key_type_encrypted;
2349 set_key = set_key_encrypted;
2350#endif
2351 } else {
c538f6ec 2352 return -EINVAL;
27f5411a 2353 }
c538f6ec
OK		 2354
2355 new_key_string = kstrdup(key_string, GFP_KERNEL);
2356 if (!new_key_string)
2357 return -ENOMEM;
2358
27f5411a 2359 key = request_key(type, key_desc + 1, NULL);
c538f6ec 2360 if (IS_ERR(key)) {
453431a5 2361 kfree_sensitive(new_key_string);
c538f6ec
OK		 2362 return PTR_ERR(key);
2363 }
2364
f5b0cba8 2365 down_read(&key->sem);
c538f6ec 2366
27f5411a
DB		 2367 ret = set_key(cc, key);
2368 if (ret < 0) {
f5b0cba8 2369 up_read(&key->sem);
c538f6ec 2370 key_put(key);
453431a5 2371 kfree_sensitive(new_key_string);
27f5411a 2372 return ret;
c538f6ec
OK		 2373 }
2374
f5b0cba8 2375 up_read(&key->sem);
c538f6ec
OK		 2376 key_put(key);
2377
2378 /* clear the flag since following operations may invalidate previously valid key */
2379 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
2380
2381 ret = crypt_setkey(cc);
2382
c538f6ec
OK		 2383 if (!ret) {
2384 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
453431a5 2385 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2386 cc->key_string = new_key_string;
2387 } else
453431a5 2388 kfree_sensitive(new_key_string);
c538f6ec
OK		 2389
2390 return ret;
2391}
2392
2393static int get_key_size(char **key_string)
2394{
2395 char *colon, dummy;
2396 int ret;
2397
2398 if (*key_string[0] != ':')
2399 return strlen(*key_string) >> 1;
2400
2401 /* look for next ':' in key string */
2402 colon = strpbrk(*key_string + 1, ":");
2403 if (!colon)
2404 return -EINVAL;
2405
2406 if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':')
2407 return -EINVAL;
2408
2409 *key_string = colon;
2410
2411 /* remaining key string should be :<logon|user>:<key_desc> */
2412
2413 return ret;
2414}
2415
2416#else
2417
2418static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string)
2419{
2420 return -EINVAL;
2421}
2422
2423static int get_key_size(char **key_string)
2424{
2425 return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
2426}
2427
27f5411a 2428#endif /* CONFIG_KEYS */
c538f6ec 2429
e48d4bbf
MB		 2430static int crypt_set_key(struct crypt_config *cc, char *key)
2431{
de8be5ac
MB		 2432 int r = -EINVAL;
2433 int key_string_len = strlen(key);
2434
69a8cfcd
MB		 2435 /* Hyphen (which gives a key_size of zero) means there is no key. */
2436 if (!cc->key_size && strcmp(key, "-"))
de8be5ac 2437 goto out;
e48d4bbf 2438
c538f6ec
OK		 2439 /* ':' means the key is in kernel keyring, short-circuit normal key processing */
2440 if (key[0] == ':') {
2441 r = crypt_set_keyring_key(cc, key + 1);
de8be5ac 2442 goto out;
c538f6ec 2443 }
e48d4bbf 2444
265e9098
OK		 2445 /* clear the flag since following operations may invalidate previously valid key */
2446 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
e48d4bbf 2447
c538f6ec 2448 /* wipe references to any kernel keyring key */
453431a5 2449 kfree_sensitive(cc->key_string);
c538f6ec
OK		 2450 cc->key_string = NULL;
2451
e944e03e
AS		 2452 /* Decode key from its hex representation. */
2453 if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0)
de8be5ac 2454 goto out;
e48d4bbf 2455
671ea6b4 2456 r = crypt_setkey(cc);
265e9098
OK		 2457 if (!r)
2458 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
de8be5ac
MB		 2459
2460out:
2461 /* Hex key string not needed after here, so wipe it. */
2462 memset(key, '0', key_string_len);
2463
2464 return r;
e48d4bbf
MB		 2465}
2466
2467static int crypt_wipe_key(struct crypt_config *cc)
2468{
c82feeec
OK		 2469 int r;
2470
e48d4bbf 2471 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
c82feeec 2472 get_random_bytes(&cc->key, cc->key_size);
4a52ffc7
MB		 2473
2474 /* Wipe IV private keys */
2475 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2476 r = cc->iv_gen_ops->wipe(cc);
2477 if (r)
2478 return r;
2479 }
2480
453431a5 2481 kfree_sensitive(cc->key_string);
c538f6ec 2482 cc->key_string = NULL;
c82feeec
OK		 2483 r = crypt_setkey(cc);
2484 memset(&cc->key, 0, cc->key_size * sizeof(u8));
c0297721 2485
c82feeec 2486 return r;
e48d4bbf
MB		 2487}
2488
5059353d
MP		 2489static void crypt_calculate_pages_per_client(void)
2490{
ca79b0c2 2491 unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
5059353d
MP		 2492
2493 if (!dm_crypt_clients_n)
2494 return;
2495
2496 pages /= dm_crypt_clients_n;
2497 if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT)
2498 pages = DM_CRYPT_MIN_PAGES_PER_CLIENT;
2499 dm_crypt_pages_per_client = pages;
2500}
2501
2502static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data)
2503{
2504 struct crypt_config *cc = pool_data;
2505 struct page *page;
2506
2507 if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) &&
2508 likely(gfp_mask & __GFP_NORETRY))
2509 return NULL;
2510
2511 page = alloc_page(gfp_mask);
2512 if (likely(page != NULL))
2513 percpu_counter_add(&cc->n_allocated_pages, 1);
2514
2515 return page;
2516}
2517
2518static void crypt_page_free(void *page, void *pool_data)
2519{
2520 struct crypt_config *cc = pool_data;
2521
2522 __free_page(page);
2523 percpu_counter_sub(&cc->n_allocated_pages, 1);
2524}
2525
28513fcc
MB		 2526static void crypt_dtr(struct dm_target *ti)
2527{
2528 struct crypt_config *cc = ti->private;
2529
2530 ti->private = NULL;
2531
2532 if (!cc)
2533 return;
2534
f659b100 2535 if (cc->write_thread)
dc267621
MP		 2536 kthread_stop(cc->write_thread);
2537
28513fcc
MB		 2538 if (cc->io_queue)
2539 destroy_workqueue(cc->io_queue);
2540 if (cc->crypt_queue)
2541 destroy_workqueue(cc->crypt_queue);
2542
fd2d231f
MP		 2543 crypt_free_tfms(cc);
2544
6f1c819c 2545 bioset_exit(&cc->bs);
28513fcc 2546
6f1c819c
KO		 2547 mempool_exit(&cc->page_pool);
2548 mempool_exit(&cc->req_pool);
2549 mempool_exit(&cc->tag_pool);
2550
d00a11df
KO		 2551 WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
2552 percpu_counter_destroy(&cc->n_allocated_pages);
2553
28513fcc
MB		 2554 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
2555 cc->iv_gen_ops->dtr(cc);
2556
28513fcc
MB		 2557 if (cc->dev)
2558 dm_put_device(ti, cc->dev);
2559
453431a5
WL		 2560 kfree_sensitive(cc->cipher_string);
2561 kfree_sensitive(cc->key_string);
2562 kfree_sensitive(cc->cipher_auth);
2563 kfree_sensitive(cc->authenc_key);
28513fcc 2564
d5ffebdd
MS		 2565 mutex_destroy(&cc->bio_alloc_lock);
2566
28513fcc 2567 /* Must zero key material before freeing */
453431a5 2568 kfree_sensitive(cc);
5059353d
MP		 2569
2570 spin_lock(&dm_crypt_clients_lock);
2571 WARN_ON(!dm_crypt_clients_n);
2572 dm_crypt_clients_n--;
2573 crypt_calculate_pages_per_client();
2574 spin_unlock(&dm_crypt_clients_lock);
28513fcc
MB		 2575}
2576
e889f97a
MB		 2577static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
2578{
2579 struct crypt_config *cc = ti->private;
2580
33d2f09f 2581 if (crypt_integrity_aead(cc))
e889f97a
MB		 2582 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
2583 else
2584 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2585
e889f97a
MB		 2586 if (cc->iv_size)
2587 /* at least a 64 bit sector number should fit in our buffer */
2588 cc->iv_size = max(cc->iv_size,
2589 (unsigned int)(sizeof(u64) / sizeof(u8)));
2590 else if (ivmode) {
2591 DMWARN("Selected cipher does not support IVs");
2592 ivmode = NULL;
2593 }
2594
2595 /* Choose ivmode, see comments at iv code. */
2596 if (ivmode == NULL)
2597 cc->iv_gen_ops = NULL;
2598 else if (strcmp(ivmode, "plain") == 0)
2599 cc->iv_gen_ops = &crypt_iv_plain_ops;
2600 else if (strcmp(ivmode, "plain64") == 0)
2601 cc->iv_gen_ops = &crypt_iv_plain64_ops;
7e3fd855
MB		 2602 else if (strcmp(ivmode, "plain64be") == 0)
2603 cc->iv_gen_ops = &crypt_iv_plain64be_ops;
e889f97a
MB		 2604 else if (strcmp(ivmode, "essiv") == 0)
2605 cc->iv_gen_ops = &crypt_iv_essiv_ops;
2606 else if (strcmp(ivmode, "benbi") == 0)
2607 cc->iv_gen_ops = &crypt_iv_benbi_ops;
2608 else if (strcmp(ivmode, "null") == 0)
2609 cc->iv_gen_ops = &crypt_iv_null_ops;
b9411d73
MB		 2610 else if (strcmp(ivmode, "eboiv") == 0)
2611 cc->iv_gen_ops = &crypt_iv_eboiv_ops;
bbb16584
MB		 2612 else if (strcmp(ivmode, "elephant") == 0) {
2613 cc->iv_gen_ops = &crypt_iv_elephant_ops;
2614 cc->key_parts = 2;
2615 cc->key_extra_size = cc->key_size / 2;
2616 if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE)
2617 return -EINVAL;
2618 set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags);
2619 } else if (strcmp(ivmode, "lmk") == 0) {
e889f97a
MB		 2620 cc->iv_gen_ops = &crypt_iv_lmk_ops;
2621 /*
2622 * Version 2 and 3 is recognised according
2623 * to length of provided multi-key string.
2624 * If present (version 3), last key is used as IV seed.
2625 * All keys (including IV seed) are always the same size.
2626 */
2627 if (cc->key_size % cc->key_parts) {
2628 cc->key_parts++;
2629 cc->key_extra_size = cc->key_size / cc->key_parts;
2630 }
2631 } else if (strcmp(ivmode, "tcw") == 0) {
2632 cc->iv_gen_ops = &crypt_iv_tcw_ops;
2633 cc->key_parts += 2; /* IV + whitening */
2634 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
2635 } else if (strcmp(ivmode, "random") == 0) {
2636 cc->iv_gen_ops = &crypt_iv_random_ops;
2637 /* Need storage space in integrity fields. */
2638 cc->integrity_iv_size = cc->iv_size;
2639 } else {
2640 ti->error = "Invalid IV mode";
2641 return -EINVAL;
2642 }
2643
2644 return 0;
2645}
2646
33d2f09f
MB		 2647/*
2648 * Workaround to parse HMAC algorithm from AEAD crypto API spec.
2649 * The HMAC is needed to calculate tag size (HMAC digest size).
2650 * This should be probably done by crypto-api calls (once available...)
2651 */
2652static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
2653{
2654 char *start, *end, *mac_alg = NULL;
2655 struct crypto_ahash *mac;
2656
2657 if (!strstarts(cipher_api, "authenc("))
2658 return 0;
2659
2660 start = strchr(cipher_api, '(');
2661 end = strchr(cipher_api, ',');
2662 if (!start || !end || ++start > end)
2663 return -EINVAL;
2664
2665 mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
2666 if (!mac_alg)
2667 return -ENOMEM;
2668 strncpy(mac_alg, start, end - start);
2669
2670 mac = crypto_alloc_ahash(mac_alg, 0, 0);
2671 kfree(mac_alg);
2672
2673 if (IS_ERR(mac))
2674 return PTR_ERR(mac);
2675
2676 cc->key_mac_size = crypto_ahash_digestsize(mac);
2677 crypto_free_ahash(mac);
2678
2679 cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL);
2680 if (!cc->authenc_key)
2681 return -ENOMEM;
2682
2683 return 0;
2684}
2685
2686static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key,
2687 char **ivmode, char **ivopts)
2688{
2689 struct crypt_config *cc = ti->private;
a1a262b6 2690 char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME];
33d2f09f
MB		 2691 int ret = -EINVAL;
2692
2693 cc->tfms_count = 1;
2694
2695 /*
2696 * New format (capi: prefix)
2697 * capi:cipher_api_spec-iv:ivopts
2698 */
2699 tmp = &cipher_in[strlen("capi:")];
1856b9f7
MB		 2700
2701 /* Separate IV options if present, it can contain another '-' in hash name */
2702 *ivopts = strrchr(tmp, ':');
2703 if (*ivopts) {
2704 **ivopts = '\0';
2705 (*ivopts)++;
2706 }
2707 /* Parse IV mode */
2708 *ivmode = strrchr(tmp, '-');
2709 if (*ivmode) {
2710 **ivmode = '\0';
2711 (*ivmode)++;
2712 }
2713 /* The rest is crypto API spec */
2714 cipher_api = tmp;
33d2f09f 2715
a1a262b6
AB		 2716 /* Alloc AEAD, can be used only in new format. */
2717 if (crypt_integrity_aead(cc)) {
2718 ret = crypt_ctr_auth_cipher(cc, cipher_api);
2719 if (ret < 0) {
2720 ti->error = "Invalid AEAD cipher spec";
2721 return -ENOMEM;
2722 }
2723 }
2724
33d2f09f
MB		 2725 if (*ivmode && !strcmp(*ivmode, "lmk"))
2726 cc->tfms_count = 64;
2727
a1a262b6
AB		 2728 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2729 if (!*ivopts) {
2730 ti->error = "Digest algorithm missing for ESSIV mode";
2731 return -EINVAL;
2732 }
2733 ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)",
2734 cipher_api, *ivopts);
2735 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
2736 ti->error = "Cannot allocate cipher string";
2737 return -ENOMEM;
2738 }
2739 cipher_api = buf;
2740 }
2741
33d2f09f
MB		 2742 cc->key_parts = cc->tfms_count;
2743
2744 /* Allocate cipher */
2745 ret = crypt_alloc_tfms(cc, cipher_api);
2746 if (ret < 0) {
2747 ti->error = "Error allocating crypto tfm";
2748 return ret;
2749 }
2750
a1a262b6 2751 if (crypt_integrity_aead(cc))
33d2f09f 2752 cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc));
a1a262b6 2753 else
33d2f09f
MB		 2754 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
2755
33d2f09f
MB		 2756 return 0;
2757}
2758
2759static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key,
2760 char **ivmode, char **ivopts)
1da177e4 2761{
5ebaee6d 2762 struct crypt_config *cc = ti->private;
33d2f09f 2763 char *tmp, *cipher, *chainmode, *keycount;
5ebaee6d 2764 char *cipher_api = NULL;
fd2d231f 2765 int ret = -EINVAL;
31998ef1 2766 char dummy;
1da177e4 2767
33d2f09f 2768 if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) {
5ebaee6d 2769 ti->error = "Bad cipher specification";
1da177e4
LT		 2770 return -EINVAL;
2771 }
2772
5ebaee6d
MB		 2773 /*
2774 * Legacy dm-crypt cipher specification
d1f96423 2775 * cipher[:keycount]-mode-iv:ivopts
5ebaee6d
MB		 2776 */
2777 tmp = cipher_in;
d1f96423
MB		 2778 keycount = strsep(&tmp, "-");
2779 cipher = strsep(&keycount, ":");
2780
2781 if (!keycount)
2782 cc->tfms_count = 1;
31998ef1 2783 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
d1f96423
MB		 2784 !is_power_of_2(cc->tfms_count)) {
2785 ti->error = "Bad cipher key count specification";
2786 return -EINVAL;
2787 }
2788 cc->key_parts = cc->tfms_count;
5ebaee6d 2789
1da177e4 2790 chainmode = strsep(&tmp, "-");
1856b9f7
MB		 2791 *ivmode = strsep(&tmp, ":");
2792 *ivopts = tmp;
1da177e4 2793
7dbcd137
MB		 2794 /*
2795 * For compatibility with the original dm-crypt mapping format, if
2796 * only the cipher name is supplied, use cbc-plain.
2797 */
33d2f09f 2798 if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) {
1da177e4 2799 chainmode = "cbc";
33d2f09f 2800 *ivmode = "plain";
1da177e4
LT		 2801 }
2802
33d2f09f 2803 if (strcmp(chainmode, "ecb") && !*ivmode) {
5ebaee6d
MB		 2804 ti->error = "IV mechanism required";
2805 return -EINVAL;
1da177e4
LT		 2806 }
2807
5ebaee6d
MB		 2808 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
2809 if (!cipher_api)
2810 goto bad_mem;
2811
a1a262b6
AB		 2812 if (*ivmode && !strcmp(*ivmode, "essiv")) {
2813 if (!*ivopts) {
2814 ti->error = "Digest algorithm missing for ESSIV mode";
2815 kfree(cipher_api);
2816 return -EINVAL;
2817 }
2818 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2819 "essiv(%s(%s),%s)", chainmode, cipher, *ivopts);
2820 } else {
2821 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
2822 "%s(%s)", chainmode, cipher);
2823 }
2824 if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) {
5ebaee6d
MB		 2825 kfree(cipher_api);
2826 goto bad_mem;
1da177e4
LT		 2827 }
2828
5ebaee6d 2829 /* Allocate cipher */
fd2d231f
MP		 2830 ret = crypt_alloc_tfms(cc, cipher_api);
2831 if (ret < 0) {
2832 ti->error = "Error allocating crypto tfm";
33d2f09f
MB		 2833 kfree(cipher_api);
2834 return ret;
1da177e4 2835 }
bd86e320 2836 kfree(cipher_api);
1da177e4 2837
33d2f09f
MB		 2838 return 0;
2839bad_mem:
2840 ti->error = "Cannot allocate cipher strings";
2841 return -ENOMEM;
2842}
5ebaee6d 2843
33d2f09f
MB		 2844static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key)
2845{
2846 struct crypt_config *cc = ti->private;
2847 char *ivmode = NULL, *ivopts = NULL;
2848 int ret;
2849
2850 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
2851 if (!cc->cipher_string) {
2852 ti->error = "Cannot allocate cipher strings";
2853 return -ENOMEM;
1da177e4
LT		 2854 }
2855
33d2f09f
MB		 2856 if (strstarts(cipher_in, "capi:"))
2857 ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts);
2858 else
2859 ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts);
2860 if (ret)
2861 return ret;
2862
5ebaee6d 2863 /* Initialize IV */
e889f97a
MB		 2864 ret = crypt_ctr_ivmode(ti, ivmode);
2865 if (ret < 0)
33d2f09f 2866 return ret;
1da177e4 2867
da31a078
MB		 2868 /* Initialize and set key */
2869 ret = crypt_set_key(cc, key);
2870 if (ret < 0) {
2871 ti->error = "Error decoding and setting key";
33d2f09f 2872 return ret;
da31a078
MB		 2873 }
2874
28513fcc
MB		 2875 /* Allocate IV */
2876 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
2877 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
2878 if (ret < 0) {
2879 ti->error = "Error creating IV";
33d2f09f 2880 return ret;
28513fcc
MB		 2881 }
2882 }
1da177e4 2883
28513fcc
MB		 2884 /* Initialize IV (set keys for ESSIV etc) */
2885 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
2886 ret = cc->iv_gen_ops->init(cc);
2887 if (ret < 0) {
2888 ti->error = "Error initialising IV";
33d2f09f 2889 return ret;
28513fcc 2890 }
b95bf2d3
MB		 2891 }
2892
dc94902b
OK		 2893 /* wipe the kernel key payload copy */
2894 if (cc->key_string)
2895 memset(cc->key, 0, cc->key_size * sizeof(u8));
2896
5ebaee6d 2897 return ret;
5ebaee6d 2898}
5ebaee6d 2899
ef43aa38
MB		 2900static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv)
2901{
2902 struct crypt_config *cc = ti->private;
2903 struct dm_arg_set as;
5916a22b 2904 static const struct dm_arg _args[] = {
39d42fa9 2905 {0, 8, "Invalid number of feature args"},
ef43aa38
MB		 2906 };
2907 unsigned int opt_params, val;
2908 const char *opt_string, *sval;
8f0009a2 2909 char dummy;
ef43aa38
MB		 2910 int ret;
2911
2912 /* Optional parameters */
2913 as.argc = argc;
2914 as.argv = argv;
2915
2916 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
2917 if (ret)
2918 return ret;
2919
2920 while (opt_params--) {
2921 opt_string = dm_shift_arg(&as);
2922 if (!opt_string) {
2923 ti->error = "Not enough feature arguments";
2924 return -EINVAL;
2925 }
2926
2927 if (!strcasecmp(opt_string, "allow_discards"))
2928 ti->num_discard_bios = 1;
2929
2930 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
2931 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
2932
2933 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
2934 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 2935 else if (!strcasecmp(opt_string, "no_read_workqueue"))
2936 set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
2937 else if (!strcasecmp(opt_string, "no_write_workqueue"))
2938 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ef43aa38
MB		 2939 else if (sscanf(opt_string, "integrity:%u:", &val) == 1) {
2940 if (val == 0 || val > MAX_TAG_SIZE) {
2941 ti->error = "Invalid integrity arguments";
2942 return -EINVAL;
2943 }
2944 cc->on_disk_tag_size = val;
2945 sval = strchr(opt_string + strlen("integrity:"), ':') + 1;
2946 if (!strcasecmp(sval, "aead")) {
2947 set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags);
ef43aa38
MB		 2948 } else if (strcasecmp(sval, "none")) {
2949 ti->error = "Unknown integrity profile";
2950 return -EINVAL;
2951 }
2952
2953 cc->cipher_auth = kstrdup(sval, GFP_KERNEL);
2954 if (!cc->cipher_auth)
2955 return -ENOMEM;
ff3af92b 2956 } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) {
8f0009a2
MB		 2957 if (cc->sector_size < (1 << SECTOR_SHIFT) ||
2958 cc->sector_size > 4096 ||
ff3af92b 2959 (cc->sector_size & (cc->sector_size - 1))) {
8f0009a2
MB		 2960 ti->error = "Invalid feature value for sector_size";
2961 return -EINVAL;
2962 }
783874b0
MB		 2963 if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
2964 ti->error = "Device size is not multiple of sector_size feature";
2965 return -EINVAL;
2966 }
ff3af92b 2967 cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
8f0009a2
MB		 2968 } else if (!strcasecmp(opt_string, "iv_large_sectors"))
2969 set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
2970 else {
ef43aa38
MB		 2971 ti->error = "Invalid feature arguments";
2972 return -EINVAL;
2973 }
2974 }
2975
2976 return 0;
5ebaee6d
MB		 2977}
2978
8e225f04
DLM		 2979#ifdef CONFIG_BLK_DEV_ZONED
2980
2981static int crypt_report_zones(struct dm_target *ti,
2982 struct dm_report_zones_args *args, unsigned int nr_zones)
2983{
2984 struct crypt_config *cc = ti->private;
2985 sector_t sector = cc->start + dm_target_offset(ti, args->next_sector);
2986
2987 args->start = cc->start;
2988 return blkdev_report_zones(cc->dev->bdev, sector, nr_zones,
2989 dm_report_zones_cb, args);
2990}
2991
2992#endif
2993
5ebaee6d
MB		 2994/*
2995 * Construct an encryption mapping:
c538f6ec 2996 * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start>
5ebaee6d
MB		 2997 */
2998static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2999{
3000 struct crypt_config *cc;
ed0302e8 3001 const char *devname = dm_table_device_name(ti->table);
c538f6ec 3002 int key_size;
ef43aa38 3003 unsigned int align_mask;
5ebaee6d
MB		 3004 unsigned long long tmpll;
3005 int ret;
ef43aa38 3006 size_t iv_size_padding, additional_req_size;
31998ef1 3007 char dummy;
772ae5f5 3008
772ae5f5 3009 if (argc < 5) {
5ebaee6d
MB		 3010 ti->error = "Not enough arguments";
3011 return -EINVAL;
1da177e4
LT		 3012 }
3013
c538f6ec
OK		 3014 key_size = get_key_size(&argv[1]);
3015 if (key_size < 0) {
3016 ti->error = "Cannot parse key size";
3017 return -EINVAL;
3018 }
5ebaee6d 3019
9c81c99b 3020 cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL);
5ebaee6d
MB		 3021 if (!cc) {
3022 ti->error = "Cannot allocate encryption context";
3023 return -ENOMEM;
3024 }
69a8cfcd 3025 cc->key_size = key_size;
8f0009a2 3026 cc->sector_size = (1 << SECTOR_SHIFT);
ff3af92b 3027 cc->sector_shift = 0;
5ebaee6d
MB		 3028
3029 ti->private = cc;
ef43aa38 3030
5059353d
MP		 3031 spin_lock(&dm_crypt_clients_lock);
3032 dm_crypt_clients_n++;
3033 crypt_calculate_pages_per_client();
3034 spin_unlock(&dm_crypt_clients_lock);
3035
3036 ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL);
3037 if (ret < 0)
3038 goto bad;
3039
ef43aa38
MB		 3040 /* Optional parameters need to be read before cipher constructor */
3041 if (argc > 5) {
3042 ret = crypt_ctr_optional(ti, argc - 5, &argv[5]);
3043 if (ret)
3044 goto bad;
3045 }
3046
5ebaee6d
MB		 3047 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
3048 if (ret < 0)
3049 goto bad;
3050
33d2f09f 3051 if (crypt_integrity_aead(cc)) {
ef43aa38
MB		 3052 cc->dmreq_start = sizeof(struct aead_request);
3053 cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc));
3054 align_mask = crypto_aead_alignmask(any_tfm_aead(cc));
3055 } else {
3056 cc->dmreq_start = sizeof(struct skcipher_request);
3057 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
3058 align_mask = crypto_skcipher_alignmask(any_tfm(cc));
3059 }
d49ec52f
MP		 3060 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
3061
ef43aa38 3062 if (align_mask < CRYPTO_MINALIGN) {
d49ec52f
MP		 3063 /* Allocate the padding exactly */
3064 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
ef43aa38 3065 & align_mask;
d49ec52f
MP		 3066 } else {
3067 /*
3068 * If the cipher requires greater alignment than kmalloc
3069 * alignment, we don't know the exact position of the
3070 * initialization vector. We must assume worst case.
3071 */
ef43aa38 3072 iv_size_padding = align_mask;
d49ec52f 3073 }
ddd42edf 3074
ef43aa38
MB		 3075 /* ...| IV + padding | original IV | original sec. number | bio tag offset | */
3076 additional_req_size = sizeof(struct dm_crypt_request) +
3077 iv_size_padding + cc->iv_size +
3078 cc->iv_size +
3079 sizeof(uint64_t) +
3080 sizeof(unsigned int);
3081
6f1c819c
KO		 3082 ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size);
3083 if (ret) {
ddd42edf 3084 ti->error = "Cannot allocate crypt request mempool";
28513fcc 3085 goto bad;
ddd42edf 3086 }
ddd42edf 3087
30187e1d 3088 cc->per_bio_data_size = ti->per_io_data_size =
ef43aa38 3089 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size,
d49ec52f 3090 ARCH_KMALLOC_MINALIGN);
298a9fa0 3091
6f1c819c
KO		 3092 ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc);
3093 if (ret) {
72d94861 3094 ti->error = "Cannot allocate page mempool";
28513fcc 3095 goto bad;
1da177e4
LT		 3096 }
3097
6f1c819c
KO		 3098 ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS);
3099 if (ret) {
6a24c718 3100 ti->error = "Cannot allocate crypt bioset";
28513fcc 3101 goto bad;
6a24c718
MB		 3102 }
3103
7145c241
MP		 3104 mutex_init(&cc->bio_alloc_lock);
3105
28513fcc 3106 ret = -EINVAL;
8f0009a2
MB		 3107 if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) ||
3108 (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) {
72d94861 3109 ti->error = "Invalid iv_offset sector";
28513fcc 3110 goto bad;
1da177e4 3111 }
4ee218cd 3112 cc->iv_offset = tmpll;
1da177e4 3113
e80d1c80
VG		 3114 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
3115 if (ret) {
28513fcc
MB		 3116 ti->error = "Device lookup failed";
3117 goto bad;
3118 }
3119
e80d1c80 3120 ret = -EINVAL;
ef87bfc2 3121 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
72d94861 3122 ti->error = "Invalid device sector";
28513fcc 3123 goto bad;
1da177e4 3124 }
4ee218cd 3125 cc->start = tmpll;
1da177e4 3126
8e225f04
DLM		 3127 /*
3128 * For zoned block devices, we need to preserve the issuer write
3129 * ordering. To do so, disable write workqueues and force inline
3130 * encryption completion.
3131 */
3132 if (bdev_is_zoned(cc->dev->bdev)) {
3133 set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
3134 set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags);
3135 }
3136
33d2f09f 3137 if (crypt_integrity_aead(cc) || cc->integrity_iv_size) {
ef43aa38 3138 ret = crypt_integrity_ctr(cc, ti);
772ae5f5
MB		 3139 if (ret)
3140 goto bad;
3141
ef43aa38
MB		 3142 cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size;
3143 if (!cc->tag_pool_max_sectors)
3144 cc->tag_pool_max_sectors = 1;
f3396c58 3145
6f1c819c 3146 ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS,
ef43aa38 3147 cc->tag_pool_max_sectors * cc->on_disk_tag_size);
6f1c819c 3148 if (ret) {
ef43aa38
MB		 3149 ti->error = "Cannot allocate integrity tags mempool";
3150 goto bad;
772ae5f5 3151 }
583fe747
MP		 3152
3153 cc->tag_pool_max_sectors <<= cc->sector_shift;
772ae5f5
MB		 3154 }
3155
28513fcc 3156 ret = -ENOMEM;
f612b213 3157 cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
cabf08e4
MB		 3158 if (!cc->io_queue) {
3159 ti->error = "Couldn't create kcryptd io queue";
28513fcc 3160 goto bad;
cabf08e4
MB		 3161 }
3162
f3396c58 3163 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
f612b213 3164 cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
ed0302e8 3165 1, devname);
f3396c58 3166 else
ed0302e8 3167 cc->crypt_queue = alloc_workqueue("kcryptd/%s",
f612b213 3168 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
ed0302e8 3169 num_online_cpus(), devname);
cabf08e4 3170 if (!cc->crypt_queue) {
9934a8be 3171 ti->error = "Couldn't create kcryptd queue";
28513fcc 3172 goto bad;
9934a8be
MB		 3173 }
3174
c7329eff 3175 spin_lock_init(&cc->write_thread_lock);
b3c5fd30 3176 cc->write_tree = RB_ROOT;
dc267621 3177
ed0302e8 3178 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname);
dc267621
MP		 3179 if (IS_ERR(cc->write_thread)) {
3180 ret = PTR_ERR(cc->write_thread);
3181 cc->write_thread = NULL;
3182 ti->error = "Couldn't spawn write thread";
3183 goto bad;
3184 }
3185 wake_up_process(cc->write_thread);
3186
55a62eef 3187 ti->num_flush_bios = 1;
983c7db3 3188
1da177e4
LT		 3189 return 0;
3190
28513fcc
MB		 3191bad:
3192 crypt_dtr(ti);
3193 return ret;
1da177e4
LT		 3194}
3195
7de3ee57 3196static int crypt_map(struct dm_target *ti, struct bio *bio)
1da177e4 3197{
028867ac 3198 struct dm_crypt_io *io;
49a8a920 3199 struct crypt_config *cc = ti->private;
647c7db1 3200
772ae5f5 3201 /*
28a8f0d3
MC		 3202 * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues.
3203 * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight
e6047149 3204 * - for REQ_OP_DISCARD caller must use flush if IO ordering matters
772ae5f5 3205 */
1eff9d32 3206 if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
28a8f0d3 3207 bio_op(bio) == REQ_OP_DISCARD)) {
74d46992 3208 bio_set_dev(bio, cc->dev->bdev);
772ae5f5 3209 if (bio_sectors(bio))
4f024f37
KO		 3210 bio->bi_iter.bi_sector = cc->start +
3211 dm_target_offset(ti, bio->bi_iter.bi_sector);
647c7db1
MP		 3212 return DM_MAPIO_REMAPPED;
3213 }
1da177e4 3214
4e870e94
MP		 3215 /*
3216 * Check if bio is too large, split as needed.
3217 */
3218 if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) &&
ef43aa38 3219 (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
4e870e94
MP		 3220 dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT));
3221
8f0009a2
MB		 3222 /*
3223 * Ensure that bio is a multiple of internal sector encryption size
3224 * and is aligned to this size as defined in IO hints.
3225 */
3226 if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
846785e6 3227 return DM_MAPIO_KILL;
8f0009a2
MB		 3228
3229 if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
846785e6 3230 return DM_MAPIO_KILL;
8f0009a2 3231
298a9fa0
MP		 3232 io = dm_per_bio_data(bio, cc->per_bio_data_size);
3233 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
ef43aa38
MB		 3234
3235 if (cc->on_disk_tag_size) {
583fe747 3236 unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
ef43aa38
MB		 3237
3238 if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
583fe747 3239 unlikely(!(io->integrity_metadata = kmalloc(tag_len,
ef43aa38
MB		 3240 GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
3241 if (bio_sectors(bio) > cc->tag_pool_max_sectors)
3242 dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
6f1c819c 3243 io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);
ef43aa38
MB		 3244 io->integrity_metadata_from_pool = true;
3245 }
3246 }
3247
33d2f09f 3248 if (crypt_integrity_aead(cc))
ef43aa38
MB		 3249 io->ctx.r.req_aead = (struct aead_request *)(io + 1);
3250 else
3251 io->ctx.r.req = (struct skcipher_request *)(io + 1);
cabf08e4 3252
20c82538
MB		 3253 if (bio_data_dir(io->base_bio) == READ) {
3254 if (kcryptd_io_read(io, GFP_NOWAIT))
dc267621 3255 kcryptd_queue_read(io);
20c82538 3256 } else
cabf08e4 3257 kcryptd_queue_crypt(io);
1da177e4 3258
d2a7ad29 3259 return DM_MAPIO_SUBMITTED;
1da177e4
LT		 3260}
3261
fd7c092e
MP		 3262static void crypt_status(struct dm_target *ti, status_type_t type,
3263 unsigned status_flags, char *result, unsigned maxlen)
1da177e4 3264{
5ebaee6d 3265 struct crypt_config *cc = ti->private;
fd7c092e 3266 unsigned i, sz = 0;
f3396c58 3267 int num_feature_args = 0;
1da177e4
LT		 3268
3269 switch (type) {
3270 case STATUSTYPE_INFO:
3271 result[0] = '\0';
3272 break;
3273
3274 case STATUSTYPE_TABLE:
7dbcd137 3275 DMEMIT("%s ", cc->cipher_string);
1da177e4 3276
c538f6ec
OK		 3277 if (cc->key_size > 0) {
3278 if (cc->key_string)
3279 DMEMIT(":%u:%s", cc->key_size, cc->key_string);
3280 else
3281 for (i = 0; i < cc->key_size; i++)
3282 DMEMIT("%02x", cc->key[i]);
3283 } else
fd7c092e 3284 DMEMIT("-");
1da177e4 3285
4ee218cd
AM		 3286 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
3287 cc->dev->name, (unsigned long long)cc->start);
772ae5f5 3288
f3396c58
MP		 3289 num_feature_args += !!ti->num_discard_bios;
3290 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
0f5d8e6e 3291 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
39d42fa9
IK		 3292 num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
3293 num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
ff3af92b 3294 num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT);
8f0009a2 3295 num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);
ef43aa38
MB		 3296 if (cc->on_disk_tag_size)
3297 num_feature_args++;
f3396c58
MP		 3298 if (num_feature_args) {
3299 DMEMIT(" %d", num_feature_args);
3300 if (ti->num_discard_bios)
3301 DMEMIT(" allow_discards");
3302 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
3303 DMEMIT(" same_cpu_crypt");
0f5d8e6e
MP		 3304 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
3305 DMEMIT(" submit_from_crypt_cpus");
39d42fa9
IK		 3306 if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags))
3307 DMEMIT(" no_read_workqueue");
3308 if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))
3309 DMEMIT(" no_write_workqueue");
ef43aa38
MB		 3310 if (cc->on_disk_tag_size)
3311 DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth);
8f0009a2
MB		 3312 if (cc->sector_size != (1 << SECTOR_SHIFT))
3313 DMEMIT(" sector_size:%d", cc->sector_size);
3314 if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags))
3315 DMEMIT(" iv_large_sectors");
f3396c58 3316 }
772ae5f5 3317
1da177e4
LT		 3318 break;
3319 }
1da177e4
LT		 3320}
3321
e48d4bbf
MB		 3322static void crypt_postsuspend(struct dm_target *ti)
3323{
3324 struct crypt_config *cc = ti->private;
3325
3326 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3327}
3328
3329static int crypt_preresume(struct dm_target *ti)
3330{
3331 struct crypt_config *cc = ti->private;
3332
3333 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
3334 DMERR("aborting resume - crypt key is not set.");
3335 return -EAGAIN;
3336 }
3337
3338 return 0;
3339}
3340
3341static void crypt_resume(struct dm_target *ti)
3342{
3343 struct crypt_config *cc = ti->private;
3344
3345 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
3346}
3347
3348/* Message interface
3349 * key set <key>
3350 * key wipe
3351 */
1eb5fa84
MS		 3352static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
3353 char *result, unsigned maxlen)
e48d4bbf
MB		 3354{
3355 struct crypt_config *cc = ti->private;
c538f6ec 3356 int key_size, ret = -EINVAL;
e48d4bbf
MB		 3357
3358 if (argc < 2)
3359 goto error;
3360
498f0103 3361 if (!strcasecmp(argv[0], "key")) {
e48d4bbf
MB		 3362 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
3363 DMWARN("not suspended during key manipulation.");
3364 return -EINVAL;
3365 }
498f0103 3366 if (argc == 3 && !strcasecmp(argv[1], "set")) {
c538f6ec
OK		 3367 /* The key size may not be changed. */
3368 key_size = get_key_size(&argv[2]);
3369 if (key_size < 0 || cc->key_size != key_size) {
3370 memset(argv[2], '0', strlen(argv[2]));
3371 return -EINVAL;
3372 }
3373
542da317
MB		 3374 ret = crypt_set_key(cc, argv[2]);
3375 if (ret)
3376 return ret;
3377 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
3378 ret = cc->iv_gen_ops->init(cc);
dc94902b
OK		 3379 /* wipe the kernel key payload copy */
3380 if (cc->key_string)
3381 memset(cc->key, 0, cc->key_size * sizeof(u8));
542da317
MB		 3382 return ret;
3383 }
4a52ffc7 3384 if (argc == 2 && !strcasecmp(argv[1], "wipe"))
e48d4bbf
MB		 3385 return crypt_wipe_key(cc);
3386 }
3387
3388error:
3389 DMWARN("unrecognised message received.");
3390 return -EINVAL;
3391}
3392
af4874e0
MS		 3393static int crypt_iterate_devices(struct dm_target *ti,
3394 iterate_devices_callout_fn fn, void *data)
3395{
3396 struct crypt_config *cc = ti->private;
3397
5dea271b 3398 return fn(ti, cc->dev, cc->start, ti->len, data);
af4874e0
MS		 3399}
3400
586b286b
MS		 3401static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
3402{
8f0009a2
MB		 3403 struct crypt_config *cc = ti->private;
3404
586b286b
MS		 3405 /*
3406 * Unfortunate constraint that is required to avoid the potential
3407 * for exceeding underlying device's max_segments limits -- due to
3408 * crypt_alloc_buffer() possibly allocating pages for the encryption
3409 * bio that are not as physically contiguous as the original bio.
3410 */
3411 limits->max_segment_size = PAGE_SIZE;
8f0009a2 3412
bc9e9cf0 3413 limits->logical_block_size =
64611a15 3414 max_t(unsigned, limits->logical_block_size, cc->sector_size);
bc9e9cf0
MP		 3415 limits->physical_block_size =
3416 max_t(unsigned, limits->physical_block_size, cc->sector_size);
3417 limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size);
586b286b
MS		 3418}
3419
1da177e4
LT		 3420static struct target_type crypt_target = {
3421 .name = "crypt",
39d42fa9 3422 .version = {1, 22, 0},
1da177e4
LT		 3423 .module = THIS_MODULE,
3424 .ctr = crypt_ctr,
3425 .dtr = crypt_dtr,
8e225f04
DLM		 3426#ifdef CONFIG_BLK_DEV_ZONED
3427 .features = DM_TARGET_ZONED_HM,
3428 .report_zones = crypt_report_zones,
3429#endif
1da177e4
LT		 3430 .map = crypt_map,
3431 .status = crypt_status,
e48d4bbf
MB		 3432 .postsuspend = crypt_postsuspend,
3433 .preresume = crypt_preresume,
3434 .resume = crypt_resume,
3435 .message = crypt_message,
af4874e0 3436 .iterate_devices = crypt_iterate_devices,
586b286b 3437 .io_hints = crypt_io_hints,
1da177e4
LT		 3438};
3439
3440static int __init dm_crypt_init(void)
3441{
3442 int r;
3443
1da177e4 3444 r = dm_register_target(&crypt_target);
94f5e024 3445 if (r < 0)
72d94861 3446 DMERR("register failed %d", r);
1da177e4 3447
1da177e4
LT		 3448 return r;
3449}
3450
3451static void __exit dm_crypt_exit(void)
3452{
10d3bd09 3453 dm_unregister_target(&crypt_target);
1da177e4
LT		 3454}
3455
3456module_init(dm_crypt_init);
3457module_exit(dm_crypt_exit);
3458
bf14299f 3459MODULE_AUTHOR("Jana Saout <jana@saout.de>");
1da177e4
LT		 3460MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
3461MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)