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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jana Saoutbf142992014-06-24 14:27:04 -04002 * Copyright (C) 2003 Jana Saout <jana@saout.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
Milan Broz54cea3f2015-05-15 17:00:25 +02004 * Copyright (C) 2006-2015 Red Hat, Inc. All rights reserved.
Milan Brozed04d982013-10-28 23:21:04 +01005 * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This file is released under the GPL.
8 */
9
Milan Broz43d69032008-02-08 02:11:09 +000010#include <linux/completion.h>
Herbert Xud1806f62006-08-22 20:29:17 +100011#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/bio.h>
16#include <linux/blkdev.h>
17#include <linux/mempool.h>
18#include <linux/slab.h>
19#include <linux/crypto.h>
20#include <linux/workqueue.h>
Mikulas Patockadc267622015-02-13 08:25:59 -050021#include <linux/kthread.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070022#include <linux/backing-dev.h>
Arun Sharma600634972011-07-26 16:09:06 -070023#include <linux/atomic.h>
David Hardeman378f0582005-09-17 17:55:31 +100024#include <linux/scatterlist.h>
Mikulas Patockab3c5fd32015-02-13 08:27:41 -050025#include <linux/rbtree.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <asm/page.h>
Rik Snel48527fa2006-09-03 08:56:39 +100027#include <asm/unaligned.h>
Milan Broz34745782011-01-13 19:59:55 +000028#include <crypto/hash.h>
29#include <crypto/md5.h>
30#include <crypto/algapi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Mikulas Patocka586e80e2008-10-21 17:44:59 +010032#include <linux/device-mapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Alasdair G Kergon72d94862006-06-26 00:27:35 -070034#define DM_MSG_PREFIX "crypt"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * context holding the current state of a multi-part conversion
38 */
39struct convert_context {
Milan Broz43d69032008-02-08 02:11:09 +000040 struct completion restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 struct bio *bio_in;
42 struct bio *bio_out;
Kent Overstreet003b5c52013-10-11 15:45:43 -070043 struct bvec_iter iter_in;
44 struct bvec_iter iter_out;
Mikulas Patockac66029f2012-07-27 15:08:05 +010045 sector_t cc_sector;
Mikulas Patocka40b62292012-07-27 15:08:04 +010046 atomic_t cc_pending;
Mikulas Patocka610f2de2014-02-20 18:01:01 -050047 struct ablkcipher_request *req;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
49
Milan Broz53017032008-02-08 02:10:38 +000050/*
51 * per bio private data
52 */
53struct dm_crypt_io {
Alasdair G Kergon49a8a922012-07-27 15:08:05 +010054 struct crypt_config *cc;
Milan Broz53017032008-02-08 02:10:38 +000055 struct bio *base_bio;
56 struct work_struct work;
57
58 struct convert_context ctx;
59
Mikulas Patocka40b62292012-07-27 15:08:04 +010060 atomic_t io_pending;
Milan Broz53017032008-02-08 02:10:38 +000061 int error;
Milan Broz0c395b02008-02-08 02:10:54 +000062 sector_t sector;
Mikulas Patockadc267622015-02-13 08:25:59 -050063
Mikulas Patockab3c5fd32015-02-13 08:27:41 -050064 struct rb_node rb_node;
Mikulas Patocka298a9fa2014-03-28 15:51:55 -040065} CRYPTO_MINALIGN_ATTR;
Milan Broz53017032008-02-08 02:10:38 +000066
Milan Broz01482b72008-02-08 02:11:04 +000067struct dm_crypt_request {
Huang Yingb2174ee2009-03-16 17:44:33 +000068 struct convert_context *ctx;
Milan Broz01482b72008-02-08 02:11:04 +000069 struct scatterlist sg_in;
70 struct scatterlist sg_out;
Milan Broz2dc53272011-01-13 19:59:54 +000071 sector_t iv_sector;
Milan Broz01482b72008-02-08 02:11:04 +000072};
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074struct crypt_config;
75
76struct crypt_iv_operations {
77 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
Milan Brozd469f842007-10-19 22:42:37 +010078 const char *opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 void (*dtr)(struct crypt_config *cc);
Milan Brozb95bf2d2009-12-10 23:51:56 +000080 int (*init)(struct crypt_config *cc);
Milan Broz542da312009-12-10 23:51:57 +000081 int (*wipe)(struct crypt_config *cc);
Milan Broz2dc53272011-01-13 19:59:54 +000082 int (*generator)(struct crypt_config *cc, u8 *iv,
83 struct dm_crypt_request *dmreq);
84 int (*post)(struct crypt_config *cc, u8 *iv,
85 struct dm_crypt_request *dmreq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086};
87
Milan Broz60473592009-12-10 23:51:55 +000088struct iv_essiv_private {
Milan Brozb95bf2d2009-12-10 23:51:56 +000089 struct crypto_hash *hash_tfm;
90 u8 *salt;
Milan Broz60473592009-12-10 23:51:55 +000091};
92
93struct iv_benbi_private {
94 int shift;
95};
96
Milan Broz34745782011-01-13 19:59:55 +000097#define LMK_SEED_SIZE 64 /* hash + 0 */
98struct iv_lmk_private {
99 struct crypto_shash *hash_tfm;
100 u8 *seed;
101};
102
Milan Brozed04d982013-10-28 23:21:04 +0100103#define TCW_WHITENING_SIZE 16
104struct iv_tcw_private {
105 struct crypto_shash *crc32_tfm;
106 u8 *iv_seed;
107 u8 *whitening;
108};
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110/*
111 * Crypt: maps a linear range of a block device
112 * and encrypts / decrypts at the same time.
113 */
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -0500114enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
115 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
Andi Kleenc0297722011-01-13 19:59:53 +0000116
117/*
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500118 * The fields in here must be read only after initialization.
Andi Kleenc0297722011-01-13 19:59:53 +0000119 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120struct crypt_config {
121 struct dm_dev *dev;
122 sector_t start;
123
124 /*
Milan Brozddd42ed2008-02-08 02:11:07 +0000125 * pool for per bio private data, crypto requests and
126 * encryption requeusts/buffer pages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 */
Milan Brozddd42ed2008-02-08 02:11:07 +0000128 mempool_t *req_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 mempool_t *page_pool;
Milan Broz6a24c712006-10-03 01:15:40 -0700130 struct bio_set *bs;
Mikulas Patocka7145c242015-02-13 08:24:41 -0500131 struct mutex bio_alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Milan Brozcabf08e2007-10-19 22:38:58 +0100133 struct workqueue_struct *io_queue;
134 struct workqueue_struct *crypt_queue;
Milan Broz3f1e9072008-03-28 14:16:07 -0700135
Mikulas Patockadc267622015-02-13 08:25:59 -0500136 struct task_struct *write_thread;
137 wait_queue_head_t write_thread_wait;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -0500138 struct rb_root write_tree;
Mikulas Patockadc267622015-02-13 08:25:59 -0500139
Milan Broz5ebaee62010-08-12 04:14:07 +0100140 char *cipher;
Milan Broz7dbcd132011-01-13 19:59:52 +0000141 char *cipher_string;
Milan Broz5ebaee62010-08-12 04:14:07 +0100142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct crypt_iv_operations *iv_gen_ops;
Herbert Xu79066ad2006-12-05 13:41:52 -0800144 union {
Milan Broz60473592009-12-10 23:51:55 +0000145 struct iv_essiv_private essiv;
146 struct iv_benbi_private benbi;
Milan Broz34745782011-01-13 19:59:55 +0000147 struct iv_lmk_private lmk;
Milan Brozed04d982013-10-28 23:21:04 +0100148 struct iv_tcw_private tcw;
Herbert Xu79066ad2006-12-05 13:41:52 -0800149 } iv_gen_private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 sector_t iv_offset;
151 unsigned int iv_size;
152
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100153 /* ESSIV: struct crypto_cipher *essiv_tfm */
154 void *iv_private;
155 struct crypto_ablkcipher **tfms;
Milan Brozd1f96422011-01-13 19:59:54 +0000156 unsigned tfms_count;
Andi Kleenc0297722011-01-13 19:59:53 +0000157
158 /*
Milan Brozddd42ed2008-02-08 02:11:07 +0000159 * Layout of each crypto request:
160 *
161 * struct ablkcipher_request
162 * context
163 * padding
164 * struct dm_crypt_request
165 * padding
166 * IV
167 *
168 * The padding is added so that dm_crypt_request and the IV are
169 * correctly aligned.
170 */
171 unsigned int dmreq_start;
Milan Brozddd42ed2008-02-08 02:11:07 +0000172
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400173 unsigned int per_bio_data_size;
174
Milan Broze48d4bb2006-10-03 01:15:37 -0700175 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 unsigned int key_size;
Milan Brozda31a072013-10-28 23:21:03 +0100177 unsigned int key_parts; /* independent parts in key buffer */
178 unsigned int key_extra_size; /* additional keys length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 u8 key[0];
180};
181
Milan Broz6a24c712006-10-03 01:15:40 -0700182#define MIN_IOS 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Alasdair G Kergon028867a2007-07-12 17:26:32 +0100184static void clone_init(struct dm_crypt_io *, struct bio *);
Alasdair G Kergon395b1672008-02-08 02:10:52 +0000185static void kcryptd_queue_crypt(struct dm_crypt_io *io);
Milan Broz2dc53272011-01-13 19:59:54 +0000186static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq);
Olaf Kirch027581f2007-05-09 02:32:52 -0700187
Andi Kleenc0297722011-01-13 19:59:53 +0000188/*
189 * Use this to access cipher attributes that are the same for each CPU.
190 */
191static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc)
192{
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100193 return cc->tfms[0];
Andi Kleenc0297722011-01-13 19:59:53 +0000194}
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 * Different IV generation algorithms:
198 *
Rik Snel3c164bd2006-09-02 18:17:33 +1000199 * plain: the initial vector is the 32-bit little-endian version of the sector
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200200 * number, padded with zeros if necessary.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 *
Milan Broz61afef62009-12-10 23:52:25 +0000202 * plain64: the initial vector is the 64-bit little-endian version of the sector
203 * number, padded with zeros if necessary.
204 *
Rik Snel3c164bd2006-09-02 18:17:33 +1000205 * essiv: "encrypted sector|salt initial vector", the sector number is
206 * encrypted with the bulk cipher using a salt as key. The salt
207 * should be derived from the bulk cipher's key via hashing.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 *
Rik Snel48527fa2006-09-03 08:56:39 +1000209 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
210 * (needed for LRW-32-AES and possible other narrow block modes)
211 *
Ludwig Nussel46b47732007-05-09 02:32:55 -0700212 * null: the initial vector is always zero. Provides compatibility with
213 * obsolete loop_fish2 devices. Do not use for new devices.
214 *
Milan Broz34745782011-01-13 19:59:55 +0000215 * lmk: Compatible implementation of the block chaining mode used
216 * by the Loop-AES block device encryption system
217 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
218 * It operates on full 512 byte sectors and uses CBC
219 * with an IV derived from the sector number, the data and
220 * optionally extra IV seed.
221 * This means that after decryption the first block
222 * of sector must be tweaked according to decrypted data.
223 * Loop-AES can use three encryption schemes:
224 * version 1: is plain aes-cbc mode
225 * version 2: uses 64 multikey scheme with lmk IV generator
226 * version 3: the same as version 2 with additional IV seed
227 * (it uses 65 keys, last key is used as IV seed)
228 *
Milan Brozed04d982013-10-28 23:21:04 +0100229 * tcw: Compatible implementation of the block chaining mode used
230 * by the TrueCrypt device encryption system (prior to version 4.1).
Milan Broze44f23b2015-04-05 18:03:10 +0200231 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
Milan Brozed04d982013-10-28 23:21:04 +0100232 * It operates on full 512 byte sectors and uses CBC
233 * with an IV derived from initial key and the sector number.
234 * In addition, whitening value is applied on every sector, whitening
235 * is calculated from initial key, sector number and mixed using CRC32.
236 * Note that this encryption scheme is vulnerable to watermarking attacks
237 * and should be used for old compatible containers access only.
238 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 * plumb: unimplemented, see:
240 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
241 */
242
Milan Broz2dc53272011-01-13 19:59:54 +0000243static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
244 struct dm_crypt_request *dmreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100247 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 return 0;
250}
251
Milan Broz61afef62009-12-10 23:52:25 +0000252static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
Milan Broz2dc53272011-01-13 19:59:54 +0000253 struct dm_crypt_request *dmreq)
Milan Broz61afef62009-12-10 23:52:25 +0000254{
255 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100256 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
Milan Broz61afef62009-12-10 23:52:25 +0000257
258 return 0;
259}
260
Milan Brozb95bf2d2009-12-10 23:51:56 +0000261/* Initialise ESSIV - compute salt but no local memory allocations */
262static int crypt_iv_essiv_init(struct crypt_config *cc)
263{
264 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
265 struct hash_desc desc;
266 struct scatterlist sg;
Andi Kleenc0297722011-01-13 19:59:53 +0000267 struct crypto_cipher *essiv_tfm;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100268 int err;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000269
270 sg_init_one(&sg, cc->key, cc->key_size);
271 desc.tfm = essiv->hash_tfm;
272 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
273
274 err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt);
275 if (err)
276 return err;
277
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100278 essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000279
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100280 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
281 crypto_hash_digestsize(essiv->hash_tfm));
282 if (err)
283 return err;
Andi Kleenc0297722011-01-13 19:59:53 +0000284
285 return 0;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000286}
287
Milan Broz542da312009-12-10 23:51:57 +0000288/* Wipe salt and reset key derived from volume key */
289static int crypt_iv_essiv_wipe(struct crypt_config *cc)
290{
291 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
292 unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000293 struct crypto_cipher *essiv_tfm;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100294 int r, err = 0;
Milan Broz542da312009-12-10 23:51:57 +0000295
296 memset(essiv->salt, 0, salt_size);
297
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100298 essiv_tfm = cc->iv_private;
299 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
300 if (r)
301 err = r;
Andi Kleenc0297722011-01-13 19:59:53 +0000302
303 return err;
304}
305
306/* Set up per cpu cipher state */
307static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
308 struct dm_target *ti,
309 u8 *salt, unsigned saltsize)
310{
311 struct crypto_cipher *essiv_tfm;
312 int err;
313
314 /* Setup the essiv_tfm with the given salt */
315 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
316 if (IS_ERR(essiv_tfm)) {
317 ti->error = "Error allocating crypto tfm for ESSIV";
318 return essiv_tfm;
319 }
320
321 if (crypto_cipher_blocksize(essiv_tfm) !=
322 crypto_ablkcipher_ivsize(any_tfm(cc))) {
323 ti->error = "Block size of ESSIV cipher does "
324 "not match IV size of block cipher";
325 crypto_free_cipher(essiv_tfm);
326 return ERR_PTR(-EINVAL);
327 }
328
329 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
330 if (err) {
331 ti->error = "Failed to set key for ESSIV cipher";
332 crypto_free_cipher(essiv_tfm);
333 return ERR_PTR(err);
334 }
335
336 return essiv_tfm;
Milan Broz542da312009-12-10 23:51:57 +0000337}
338
Milan Broz60473592009-12-10 23:51:55 +0000339static void crypt_iv_essiv_dtr(struct crypt_config *cc)
340{
Andi Kleenc0297722011-01-13 19:59:53 +0000341 struct crypto_cipher *essiv_tfm;
Milan Broz60473592009-12-10 23:51:55 +0000342 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
343
Milan Brozb95bf2d2009-12-10 23:51:56 +0000344 crypto_free_hash(essiv->hash_tfm);
345 essiv->hash_tfm = NULL;
346
347 kzfree(essiv->salt);
348 essiv->salt = NULL;
Andi Kleenc0297722011-01-13 19:59:53 +0000349
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100350 essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000351
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100352 if (essiv_tfm)
353 crypto_free_cipher(essiv_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000354
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100355 cc->iv_private = NULL;
Milan Broz60473592009-12-10 23:51:55 +0000356}
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
Milan Brozd469f842007-10-19 22:42:37 +0100359 const char *opts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
Milan Broz5861f1b2009-12-10 23:51:56 +0000361 struct crypto_cipher *essiv_tfm = NULL;
362 struct crypto_hash *hash_tfm = NULL;
Milan Broz5861f1b2009-12-10 23:51:56 +0000363 u8 *salt = NULL;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100364 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Milan Broz5861f1b2009-12-10 23:51:56 +0000366 if (!opts) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700367 ti->error = "Digest algorithm missing for ESSIV mode";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return -EINVAL;
369 }
370
Milan Brozb95bf2d2009-12-10 23:51:56 +0000371 /* Allocate hash algorithm */
Herbert Xu35058682006-08-24 19:10:20 +1000372 hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC);
373 if (IS_ERR(hash_tfm)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700374 ti->error = "Error initializing ESSIV hash";
Milan Broz5861f1b2009-12-10 23:51:56 +0000375 err = PTR_ERR(hash_tfm);
376 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
378
Milan Brozb95bf2d2009-12-10 23:51:56 +0000379 salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL);
Milan Broz5861f1b2009-12-10 23:51:56 +0000380 if (!salt) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700381 ti->error = "Error kmallocing salt storage in ESSIV";
Milan Broz5861f1b2009-12-10 23:51:56 +0000382 err = -ENOMEM;
383 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385
Milan Brozb95bf2d2009-12-10 23:51:56 +0000386 cc->iv_gen_private.essiv.salt = salt;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000387 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
388
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100389 essiv_tfm = setup_essiv_cpu(cc, ti, salt,
390 crypto_hash_digestsize(hash_tfm));
391 if (IS_ERR(essiv_tfm)) {
392 crypt_iv_essiv_dtr(cc);
393 return PTR_ERR(essiv_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000394 }
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100395 cc->iv_private = essiv_tfm;
Andi Kleenc0297722011-01-13 19:59:53 +0000396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return 0;
Milan Broz5861f1b2009-12-10 23:51:56 +0000398
399bad:
Milan Broz5861f1b2009-12-10 23:51:56 +0000400 if (hash_tfm && !IS_ERR(hash_tfm))
401 crypto_free_hash(hash_tfm);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000402 kfree(salt);
Milan Broz5861f1b2009-12-10 23:51:56 +0000403 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404}
405
Milan Broz2dc53272011-01-13 19:59:54 +0000406static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
407 struct dm_crypt_request *dmreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408{
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100409 struct crypto_cipher *essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100412 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
Andi Kleenc0297722011-01-13 19:59:53 +0000413 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return 0;
416}
417
Rik Snel48527fa2006-09-03 08:56:39 +1000418static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
419 const char *opts)
420{
Andi Kleenc0297722011-01-13 19:59:53 +0000421 unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc));
David Howellsf0d1b0b2006-12-08 02:37:49 -0800422 int log = ilog2(bs);
Rik Snel48527fa2006-09-03 08:56:39 +1000423
424 /* we need to calculate how far we must shift the sector count
425 * to get the cipher block count, we use this shift in _gen */
426
427 if (1 << log != bs) {
428 ti->error = "cypher blocksize is not a power of 2";
429 return -EINVAL;
430 }
431
432 if (log > 9) {
433 ti->error = "cypher blocksize is > 512";
434 return -EINVAL;
435 }
436
Milan Broz60473592009-12-10 23:51:55 +0000437 cc->iv_gen_private.benbi.shift = 9 - log;
Rik Snel48527fa2006-09-03 08:56:39 +1000438
439 return 0;
440}
441
442static void crypt_iv_benbi_dtr(struct crypt_config *cc)
443{
Rik Snel48527fa2006-09-03 08:56:39 +1000444}
445
Milan Broz2dc53272011-01-13 19:59:54 +0000446static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
447 struct dm_crypt_request *dmreq)
Rik Snel48527fa2006-09-03 08:56:39 +1000448{
Herbert Xu79066ad2006-12-05 13:41:52 -0800449 __be64 val;
450
Rik Snel48527fa2006-09-03 08:56:39 +1000451 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
Herbert Xu79066ad2006-12-05 13:41:52 -0800452
Milan Broz2dc53272011-01-13 19:59:54 +0000453 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
Herbert Xu79066ad2006-12-05 13:41:52 -0800454 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
Rik Snel48527fa2006-09-03 08:56:39 +1000455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return 0;
457}
458
Milan Broz2dc53272011-01-13 19:59:54 +0000459static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
460 struct dm_crypt_request *dmreq)
Ludwig Nussel46b47732007-05-09 02:32:55 -0700461{
462 memset(iv, 0, cc->iv_size);
463
464 return 0;
465}
466
Milan Broz34745782011-01-13 19:59:55 +0000467static void crypt_iv_lmk_dtr(struct crypt_config *cc)
468{
469 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
470
471 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
472 crypto_free_shash(lmk->hash_tfm);
473 lmk->hash_tfm = NULL;
474
475 kzfree(lmk->seed);
476 lmk->seed = NULL;
477}
478
479static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
480 const char *opts)
481{
482 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
483
484 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
485 if (IS_ERR(lmk->hash_tfm)) {
486 ti->error = "Error initializing LMK hash";
487 return PTR_ERR(lmk->hash_tfm);
488 }
489
490 /* No seed in LMK version 2 */
491 if (cc->key_parts == cc->tfms_count) {
492 lmk->seed = NULL;
493 return 0;
494 }
495
496 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
497 if (!lmk->seed) {
498 crypt_iv_lmk_dtr(cc);
499 ti->error = "Error kmallocing seed storage in LMK";
500 return -ENOMEM;
501 }
502
503 return 0;
504}
505
506static int crypt_iv_lmk_init(struct crypt_config *cc)
507{
508 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
509 int subkey_size = cc->key_size / cc->key_parts;
510
511 /* LMK seed is on the position of LMK_KEYS + 1 key */
512 if (lmk->seed)
513 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
514 crypto_shash_digestsize(lmk->hash_tfm));
515
516 return 0;
517}
518
519static int crypt_iv_lmk_wipe(struct crypt_config *cc)
520{
521 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
522
523 if (lmk->seed)
524 memset(lmk->seed, 0, LMK_SEED_SIZE);
525
526 return 0;
527}
528
529static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
530 struct dm_crypt_request *dmreq,
531 u8 *data)
532{
533 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200534 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
Milan Broz34745782011-01-13 19:59:55 +0000535 struct md5_state md5state;
Milan Brozda31a072013-10-28 23:21:03 +0100536 __le32 buf[4];
Milan Broz34745782011-01-13 19:59:55 +0000537 int i, r;
538
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200539 desc->tfm = lmk->hash_tfm;
540 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
Milan Broz34745782011-01-13 19:59:55 +0000541
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200542 r = crypto_shash_init(desc);
Milan Broz34745782011-01-13 19:59:55 +0000543 if (r)
544 return r;
545
546 if (lmk->seed) {
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200547 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
Milan Broz34745782011-01-13 19:59:55 +0000548 if (r)
549 return r;
550 }
551
552 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200553 r = crypto_shash_update(desc, data + 16, 16 * 31);
Milan Broz34745782011-01-13 19:59:55 +0000554 if (r)
555 return r;
556
557 /* Sector is cropped to 56 bits here */
558 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
559 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
560 buf[2] = cpu_to_le32(4024);
561 buf[3] = 0;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200562 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
Milan Broz34745782011-01-13 19:59:55 +0000563 if (r)
564 return r;
565
566 /* No MD5 padding here */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200567 r = crypto_shash_export(desc, &md5state);
Milan Broz34745782011-01-13 19:59:55 +0000568 if (r)
569 return r;
570
571 for (i = 0; i < MD5_HASH_WORDS; i++)
572 __cpu_to_le32s(&md5state.hash[i]);
573 memcpy(iv, &md5state.hash, cc->iv_size);
574
575 return 0;
576}
577
578static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
579 struct dm_crypt_request *dmreq)
580{
581 u8 *src;
582 int r = 0;
583
584 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
Cong Wangc2e022c2011-11-28 13:26:02 +0800585 src = kmap_atomic(sg_page(&dmreq->sg_in));
Milan Broz34745782011-01-13 19:59:55 +0000586 r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset);
Cong Wangc2e022c2011-11-28 13:26:02 +0800587 kunmap_atomic(src);
Milan Broz34745782011-01-13 19:59:55 +0000588 } else
589 memset(iv, 0, cc->iv_size);
590
591 return r;
592}
593
594static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
595 struct dm_crypt_request *dmreq)
596{
597 u8 *dst;
598 int r;
599
600 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
601 return 0;
602
Cong Wangc2e022c2011-11-28 13:26:02 +0800603 dst = kmap_atomic(sg_page(&dmreq->sg_out));
Milan Broz34745782011-01-13 19:59:55 +0000604 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset);
605
606 /* Tweak the first block of plaintext sector */
607 if (!r)
608 crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size);
609
Cong Wangc2e022c2011-11-28 13:26:02 +0800610 kunmap_atomic(dst);
Milan Broz34745782011-01-13 19:59:55 +0000611 return r;
612}
613
Milan Brozed04d982013-10-28 23:21:04 +0100614static void crypt_iv_tcw_dtr(struct crypt_config *cc)
615{
616 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
617
618 kzfree(tcw->iv_seed);
619 tcw->iv_seed = NULL;
620 kzfree(tcw->whitening);
621 tcw->whitening = NULL;
622
623 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
624 crypto_free_shash(tcw->crc32_tfm);
625 tcw->crc32_tfm = NULL;
626}
627
628static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
629 const char *opts)
630{
631 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
632
633 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
634 ti->error = "Wrong key size for TCW";
635 return -EINVAL;
636 }
637
638 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
639 if (IS_ERR(tcw->crc32_tfm)) {
640 ti->error = "Error initializing CRC32 in TCW";
641 return PTR_ERR(tcw->crc32_tfm);
642 }
643
644 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
645 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
646 if (!tcw->iv_seed || !tcw->whitening) {
647 crypt_iv_tcw_dtr(cc);
648 ti->error = "Error allocating seed storage in TCW";
649 return -ENOMEM;
650 }
651
652 return 0;
653}
654
655static int crypt_iv_tcw_init(struct crypt_config *cc)
656{
657 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
658 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
659
660 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
661 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
662 TCW_WHITENING_SIZE);
663
664 return 0;
665}
666
667static int crypt_iv_tcw_wipe(struct crypt_config *cc)
668{
669 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
670
671 memset(tcw->iv_seed, 0, cc->iv_size);
672 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
673
674 return 0;
675}
676
677static int crypt_iv_tcw_whitening(struct crypt_config *cc,
678 struct dm_crypt_request *dmreq,
679 u8 *data)
680{
681 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
682 u64 sector = cpu_to_le64((u64)dmreq->iv_sector);
683 u8 buf[TCW_WHITENING_SIZE];
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200684 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
Milan Brozed04d982013-10-28 23:21:04 +0100685 int i, r;
686
687 /* xor whitening with sector number */
688 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
689 crypto_xor(buf, (u8 *)&sector, 8);
690 crypto_xor(&buf[8], (u8 *)&sector, 8);
691
692 /* calculate crc32 for every 32bit part and xor it */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200693 desc->tfm = tcw->crc32_tfm;
694 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
Milan Brozed04d982013-10-28 23:21:04 +0100695 for (i = 0; i < 4; i++) {
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200696 r = crypto_shash_init(desc);
Milan Brozed04d982013-10-28 23:21:04 +0100697 if (r)
698 goto out;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200699 r = crypto_shash_update(desc, &buf[i * 4], 4);
Milan Brozed04d982013-10-28 23:21:04 +0100700 if (r)
701 goto out;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200702 r = crypto_shash_final(desc, &buf[i * 4]);
Milan Brozed04d982013-10-28 23:21:04 +0100703 if (r)
704 goto out;
705 }
706 crypto_xor(&buf[0], &buf[12], 4);
707 crypto_xor(&buf[4], &buf[8], 4);
708
709 /* apply whitening (8 bytes) to whole sector */
710 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
711 crypto_xor(data + i * 8, buf, 8);
712out:
Milan Broz1a71d6f2014-11-22 09:36:04 +0100713 memzero_explicit(buf, sizeof(buf));
Milan Brozed04d982013-10-28 23:21:04 +0100714 return r;
715}
716
717static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
718 struct dm_crypt_request *dmreq)
719{
720 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
721 u64 sector = cpu_to_le64((u64)dmreq->iv_sector);
722 u8 *src;
723 int r = 0;
724
725 /* Remove whitening from ciphertext */
726 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
727 src = kmap_atomic(sg_page(&dmreq->sg_in));
728 r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset);
729 kunmap_atomic(src);
730 }
731
732 /* Calculate IV */
733 memcpy(iv, tcw->iv_seed, cc->iv_size);
734 crypto_xor(iv, (u8 *)&sector, 8);
735 if (cc->iv_size > 8)
736 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
737
738 return r;
739}
740
741static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
742 struct dm_crypt_request *dmreq)
743{
744 u8 *dst;
745 int r;
746
747 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
748 return 0;
749
750 /* Apply whitening on ciphertext */
751 dst = kmap_atomic(sg_page(&dmreq->sg_out));
752 r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset);
753 kunmap_atomic(dst);
754
755 return r;
756}
757
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758static struct crypt_iv_operations crypt_iv_plain_ops = {
759 .generator = crypt_iv_plain_gen
760};
761
Milan Broz61afef62009-12-10 23:52:25 +0000762static struct crypt_iv_operations crypt_iv_plain64_ops = {
763 .generator = crypt_iv_plain64_gen
764};
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766static struct crypt_iv_operations crypt_iv_essiv_ops = {
767 .ctr = crypt_iv_essiv_ctr,
768 .dtr = crypt_iv_essiv_dtr,
Milan Brozb95bf2d2009-12-10 23:51:56 +0000769 .init = crypt_iv_essiv_init,
Milan Broz542da312009-12-10 23:51:57 +0000770 .wipe = crypt_iv_essiv_wipe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 .generator = crypt_iv_essiv_gen
772};
773
Rik Snel48527fa2006-09-03 08:56:39 +1000774static struct crypt_iv_operations crypt_iv_benbi_ops = {
775 .ctr = crypt_iv_benbi_ctr,
776 .dtr = crypt_iv_benbi_dtr,
777 .generator = crypt_iv_benbi_gen
778};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
Ludwig Nussel46b47732007-05-09 02:32:55 -0700780static struct crypt_iv_operations crypt_iv_null_ops = {
781 .generator = crypt_iv_null_gen
782};
783
Milan Broz34745782011-01-13 19:59:55 +0000784static struct crypt_iv_operations crypt_iv_lmk_ops = {
785 .ctr = crypt_iv_lmk_ctr,
786 .dtr = crypt_iv_lmk_dtr,
787 .init = crypt_iv_lmk_init,
788 .wipe = crypt_iv_lmk_wipe,
789 .generator = crypt_iv_lmk_gen,
790 .post = crypt_iv_lmk_post
791};
792
Milan Brozed04d982013-10-28 23:21:04 +0100793static struct crypt_iv_operations crypt_iv_tcw_ops = {
794 .ctr = crypt_iv_tcw_ctr,
795 .dtr = crypt_iv_tcw_dtr,
796 .init = crypt_iv_tcw_init,
797 .wipe = crypt_iv_tcw_wipe,
798 .generator = crypt_iv_tcw_gen,
799 .post = crypt_iv_tcw_post
800};
801
Milan Brozd469f842007-10-19 22:42:37 +0100802static void crypt_convert_init(struct crypt_config *cc,
803 struct convert_context *ctx,
804 struct bio *bio_out, struct bio *bio_in,
Milan Brozfcd369d2008-02-08 02:10:41 +0000805 sector_t sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806{
807 ctx->bio_in = bio_in;
808 ctx->bio_out = bio_out;
Kent Overstreet003b5c52013-10-11 15:45:43 -0700809 if (bio_in)
810 ctx->iter_in = bio_in->bi_iter;
811 if (bio_out)
812 ctx->iter_out = bio_out->bi_iter;
Mikulas Patockac66029f2012-07-27 15:08:05 +0100813 ctx->cc_sector = sector + cc->iv_offset;
Milan Broz43d69032008-02-08 02:11:09 +0000814 init_completion(&ctx->restart);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
816
Huang Yingb2174ee2009-03-16 17:44:33 +0000817static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
818 struct ablkcipher_request *req)
819{
820 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
821}
822
823static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc,
824 struct dm_crypt_request *dmreq)
825{
826 return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start);
827}
828
Milan Broz2dc53272011-01-13 19:59:54 +0000829static u8 *iv_of_dmreq(struct crypt_config *cc,
830 struct dm_crypt_request *dmreq)
831{
832 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
833 crypto_ablkcipher_alignmask(any_tfm(cc)) + 1);
834}
835
Milan Broz01482b72008-02-08 02:11:04 +0000836static int crypt_convert_block(struct crypt_config *cc,
Milan Broz3a7f6c92008-02-08 02:11:14 +0000837 struct convert_context *ctx,
838 struct ablkcipher_request *req)
Milan Broz01482b72008-02-08 02:11:04 +0000839{
Kent Overstreet003b5c52013-10-11 15:45:43 -0700840 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
841 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000842 struct dm_crypt_request *dmreq;
843 u8 *iv;
Mikulas Patocka40b62292012-07-27 15:08:04 +0100844 int r;
Milan Broz01482b72008-02-08 02:11:04 +0000845
Huang Yingb2174ee2009-03-16 17:44:33 +0000846 dmreq = dmreq_of_req(cc, req);
Milan Broz2dc53272011-01-13 19:59:54 +0000847 iv = iv_of_dmreq(cc, dmreq);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000848
Mikulas Patockac66029f2012-07-27 15:08:05 +0100849 dmreq->iv_sector = ctx->cc_sector;
Huang Yingb2174ee2009-03-16 17:44:33 +0000850 dmreq->ctx = ctx;
Milan Broz3a7f6c92008-02-08 02:11:14 +0000851 sg_init_table(&dmreq->sg_in, 1);
Kent Overstreet003b5c52013-10-11 15:45:43 -0700852 sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT,
853 bv_in.bv_offset);
Milan Broz01482b72008-02-08 02:11:04 +0000854
Milan Broz3a7f6c92008-02-08 02:11:14 +0000855 sg_init_table(&dmreq->sg_out, 1);
Kent Overstreet003b5c52013-10-11 15:45:43 -0700856 sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT,
857 bv_out.bv_offset);
Milan Broz01482b72008-02-08 02:11:04 +0000858
Kent Overstreet003b5c52013-10-11 15:45:43 -0700859 bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT);
860 bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT);
Milan Broz01482b72008-02-08 02:11:04 +0000861
Milan Broz3a7f6c92008-02-08 02:11:14 +0000862 if (cc->iv_gen_ops) {
Milan Broz2dc53272011-01-13 19:59:54 +0000863 r = cc->iv_gen_ops->generator(cc, iv, dmreq);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000864 if (r < 0)
865 return r;
866 }
867
868 ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
869 1 << SECTOR_SHIFT, iv);
870
871 if (bio_data_dir(ctx->bio_in) == WRITE)
872 r = crypto_ablkcipher_encrypt(req);
873 else
874 r = crypto_ablkcipher_decrypt(req);
875
Milan Broz2dc53272011-01-13 19:59:54 +0000876 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
877 r = cc->iv_gen_ops->post(cc, iv, dmreq);
878
Milan Broz3a7f6c92008-02-08 02:11:14 +0000879 return r;
Milan Broz01482b72008-02-08 02:11:04 +0000880}
881
Milan Broz95497a92008-02-08 02:11:12 +0000882static void kcryptd_async_done(struct crypto_async_request *async_req,
883 int error);
Andi Kleenc0297722011-01-13 19:59:53 +0000884
Milan Brozddd42ed2008-02-08 02:11:07 +0000885static void crypt_alloc_req(struct crypt_config *cc,
886 struct convert_context *ctx)
887{
Mikulas Patockac66029f2012-07-27 15:08:05 +0100888 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
Andi Kleenc0297722011-01-13 19:59:53 +0000889
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500890 if (!ctx->req)
891 ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO);
Andi Kleenc0297722011-01-13 19:59:53 +0000892
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500893 ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]);
Milan Broz54cea3f2015-05-15 17:00:25 +0200894
895 /*
896 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
897 * requests if driver request queue is full.
898 */
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500899 ablkcipher_request_set_callback(ctx->req,
Andi Kleenc0297722011-01-13 19:59:53 +0000900 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500901 kcryptd_async_done, dmreq_of_req(cc, ctx->req));
Milan Brozddd42ed2008-02-08 02:11:07 +0000902}
903
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400904static void crypt_free_req(struct crypt_config *cc,
905 struct ablkcipher_request *req, struct bio *base_bio)
906{
907 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
908
909 if ((struct ablkcipher_request *)(io + 1) != req)
910 mempool_free(req, cc->req_pool);
911}
912
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913/*
914 * Encrypt / decrypt data from one bio to another one (can be the same one)
915 */
916static int crypt_convert(struct crypt_config *cc,
Milan Brozd469f842007-10-19 22:42:37 +0100917 struct convert_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918{
Milan Broz3f1e9072008-03-28 14:16:07 -0700919 int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Mikulas Patocka40b62292012-07-27 15:08:04 +0100921 atomic_set(&ctx->cc_pending, 1);
Milan Brozc8081612008-10-10 13:37:08 +0100922
Kent Overstreet003b5c52013-10-11 15:45:43 -0700923 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Milan Broz3a7f6c92008-02-08 02:11:14 +0000925 crypt_alloc_req(cc, ctx);
926
Mikulas Patocka40b62292012-07-27 15:08:04 +0100927 atomic_inc(&ctx->cc_pending);
Milan Broz3f1e9072008-03-28 14:16:07 -0700928
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500929 r = crypt_convert_block(cc, ctx, ctx->req);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000930
931 switch (r) {
Milan Broz54cea3f2015-05-15 17:00:25 +0200932 /*
933 * The request was queued by a crypto driver
934 * but the driver request queue is full, let's wait.
935 */
Milan Broz3a7f6c92008-02-08 02:11:14 +0000936 case -EBUSY:
937 wait_for_completion(&ctx->restart);
Wolfram Sang16735d02013-11-14 14:32:02 -0800938 reinit_completion(&ctx->restart);
Milan Broz54cea3f2015-05-15 17:00:25 +0200939 /* fall through */
940 /*
941 * The request is queued and processed asynchronously,
942 * completion function kcryptd_async_done() will be called.
943 */
Rabin Vincentc0403ec2015-05-05 15:15:56 +0200944 case -EINPROGRESS:
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500945 ctx->req = NULL;
Mikulas Patockac66029f2012-07-27 15:08:05 +0100946 ctx->cc_sector++;
Milan Broz3a7f6c92008-02-08 02:11:14 +0000947 continue;
Milan Broz54cea3f2015-05-15 17:00:25 +0200948 /*
949 * The request was already processed (synchronously).
950 */
Milan Broz3f1e9072008-03-28 14:16:07 -0700951 case 0:
Mikulas Patocka40b62292012-07-27 15:08:04 +0100952 atomic_dec(&ctx->cc_pending);
Mikulas Patockac66029f2012-07-27 15:08:05 +0100953 ctx->cc_sector++;
Milan Brozc7f1b202008-07-02 09:34:28 +0100954 cond_resched();
Milan Broz3f1e9072008-03-28 14:16:07 -0700955 continue;
956
Milan Broz54cea3f2015-05-15 17:00:25 +0200957 /* There was an error while processing the request. */
Milan Broz3f1e9072008-03-28 14:16:07 -0700958 default:
Mikulas Patocka40b62292012-07-27 15:08:04 +0100959 atomic_dec(&ctx->cc_pending);
Milan Broz3f1e9072008-03-28 14:16:07 -0700960 return r;
961 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 }
963
Milan Broz3f1e9072008-03-28 14:16:07 -0700964 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965}
966
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500967static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
968
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969/*
970 * Generate a new unfragmented bio with the given size
971 * This should never violate the device limitations
Mikulas Patocka7145c242015-02-13 08:24:41 -0500972 *
973 * This function may be called concurrently. If we allocate from the mempool
974 * concurrently, there is a possibility of deadlock. For example, if we have
975 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
976 * the mempool concurrently, it may deadlock in a situation where both processes
977 * have allocated 128 pages and the mempool is exhausted.
978 *
979 * In order to avoid this scenario we allocate the pages under a mutex.
980 *
981 * In order to not degrade performance with excessive locking, we try
982 * non-blocking allocations without a mutex first but on failure we fallback
983 * to blocking allocations with a mutex.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 */
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500985static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +0100987 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -0700988 struct bio *clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
Mikulas Patocka7145c242015-02-13 08:24:41 -0500990 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
991 unsigned i, len, remaining_size;
Milan Broz91e10622007-12-13 14:16:10 +0000992 struct page *page;
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500993 struct bio_vec *bvec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
Mikulas Patocka7145c242015-02-13 08:24:41 -0500995retry:
996 if (unlikely(gfp_mask & __GFP_WAIT))
997 mutex_lock(&cc->bio_alloc_lock);
998
Olaf Kirch2f9941b2007-05-09 02:32:53 -0700999 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
Milan Broz8b004452006-10-03 01:15:37 -07001000 if (!clone)
Mikulas Patocka7145c242015-02-13 08:24:41 -05001001 goto return_clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Olaf Kirch027581f2007-05-09 02:32:52 -07001003 clone_init(io, clone);
Milan Broz6a24c712006-10-03 01:15:40 -07001004
Mikulas Patocka7145c242015-02-13 08:24:41 -05001005 remaining_size = size;
1006
Olaf Kirchf97380b2007-05-09 02:32:54 -07001007 for (i = 0; i < nr_iovecs; i++) {
Milan Broz91e10622007-12-13 14:16:10 +00001008 page = mempool_alloc(cc->page_pool, gfp_mask);
Mikulas Patocka7145c242015-02-13 08:24:41 -05001009 if (!page) {
1010 crypt_free_buffer_pages(cc, clone);
1011 bio_put(clone);
1012 gfp_mask |= __GFP_WAIT;
1013 goto retry;
1014 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Mikulas Patocka7145c242015-02-13 08:24:41 -05001016 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001018 bvec = &clone->bi_io_vec[clone->bi_vcnt++];
1019 bvec->bv_page = page;
1020 bvec->bv_len = len;
1021 bvec->bv_offset = 0;
1022
1023 clone->bi_iter.bi_size += len;
Milan Broz91e10622007-12-13 14:16:10 +00001024
Mikulas Patocka7145c242015-02-13 08:24:41 -05001025 remaining_size -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 }
1027
Mikulas Patocka7145c242015-02-13 08:24:41 -05001028return_clone:
1029 if (unlikely(gfp_mask & __GFP_WAIT))
1030 mutex_unlock(&cc->bio_alloc_lock);
1031
Milan Broz8b004452006-10-03 01:15:37 -07001032 return clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034
Neil Brown644bd2f2007-10-16 13:48:46 +02001035static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036{
Neil Brown644bd2f2007-10-16 13:48:46 +02001037 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 struct bio_vec *bv;
1039
Kent Overstreetcb34e052012-09-05 15:22:02 -07001040 bio_for_each_segment_all(bv, clone, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 BUG_ON(!bv->bv_page);
1042 mempool_free(bv->bv_page, cc->page_pool);
1043 bv->bv_page = NULL;
1044 }
1045}
1046
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001047static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1048 struct bio *bio, sector_t sector)
Milan Brozdc440d1e2008-10-10 13:37:03 +01001049{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001050 io->cc = cc;
Milan Brozdc440d1e2008-10-10 13:37:03 +01001051 io->base_bio = bio;
1052 io->sector = sector;
1053 io->error = 0;
Mikulas Patocka610f2de2014-02-20 18:01:01 -05001054 io->ctx.req = NULL;
Mikulas Patocka40b62292012-07-27 15:08:04 +01001055 atomic_set(&io->io_pending, 0);
Milan Brozdc440d1e2008-10-10 13:37:03 +01001056}
1057
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001058static void crypt_inc_pending(struct dm_crypt_io *io)
1059{
Mikulas Patocka40b62292012-07-27 15:08:04 +01001060 atomic_inc(&io->io_pending);
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001061}
1062
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063/*
1064 * One of the bios was finished. Check for completion of
1065 * the whole request and correctly clean up the buffer.
1066 */
Milan Broz5742fd72008-02-08 02:10:43 +00001067static void crypt_dec_pending(struct dm_crypt_io *io)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001069 struct crypt_config *cc = io->cc;
Milan Brozb35f8ca2009-03-16 17:44:36 +00001070 struct bio *base_bio = io->base_bio;
Milan Brozb35f8ca2009-03-16 17:44:36 +00001071 int error = io->error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Mikulas Patocka40b62292012-07-27 15:08:04 +01001073 if (!atomic_dec_and_test(&io->io_pending))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 return;
1075
Mikulas Patocka610f2de2014-02-20 18:01:01 -05001076 if (io->ctx.req)
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001077 crypt_free_req(cc, io->ctx.req, base_bio);
Milan Brozb35f8ca2009-03-16 17:44:36 +00001078
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001079 base_bio->bi_error = error;
1080 bio_endio(base_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081}
1082
1083/*
Milan Brozcabf08e2007-10-19 22:38:58 +01001084 * kcryptd/kcryptd_io:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 *
1086 * Needed because it would be very unwise to do decryption in an
Milan Broz23541d22006-10-03 01:15:39 -07001087 * interrupt context.
Milan Brozcabf08e2007-10-19 22:38:58 +01001088 *
1089 * kcryptd performs the actual encryption or decryption.
1090 *
1091 * kcryptd_io performs the IO submission.
1092 *
1093 * They must be separated as otherwise the final stages could be
1094 * starved by new requests which can block in the first stages due
1095 * to memory allocation.
Andi Kleenc0297722011-01-13 19:59:53 +00001096 *
1097 * The work is done per CPU global for all dm-crypt instances.
1098 * They should not depend on each other and do not block.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 */
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001100static void crypt_endio(struct bio *clone)
Milan Broz8b004452006-10-03 01:15:37 -07001101{
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001102 struct dm_crypt_io *io = clone->bi_private;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001103 struct crypt_config *cc = io->cc;
Milan Brozee7a4912008-02-08 02:10:46 +00001104 unsigned rw = bio_data_dir(clone);
Sasha Levin9b81c842015-08-10 19:05:18 -04001105 int error;
Milan Broz8b004452006-10-03 01:15:37 -07001106
1107 /*
NeilBrown6712ecf2007-09-27 12:47:43 +02001108 * free the processed pages
Milan Broz8b004452006-10-03 01:15:37 -07001109 */
Milan Brozee7a4912008-02-08 02:10:46 +00001110 if (rw == WRITE)
Neil Brown644bd2f2007-10-16 13:48:46 +02001111 crypt_free_buffer_pages(cc, clone);
Milan Brozee7a4912008-02-08 02:10:46 +00001112
Sasha Levin9b81c842015-08-10 19:05:18 -04001113 error = clone->bi_error;
Milan Brozee7a4912008-02-08 02:10:46 +00001114 bio_put(clone);
1115
Sasha Levin9b81c842015-08-10 19:05:18 -04001116 if (rw == READ && !error) {
Milan Brozee7a4912008-02-08 02:10:46 +00001117 kcryptd_queue_crypt(io);
1118 return;
NeilBrown6712ecf2007-09-27 12:47:43 +02001119 }
Milan Broz8b004452006-10-03 01:15:37 -07001120
Sasha Levin9b81c842015-08-10 19:05:18 -04001121 if (unlikely(error))
1122 io->error = error;
Milan Broz5742fd72008-02-08 02:10:43 +00001123
1124 crypt_dec_pending(io);
Milan Broz8b004452006-10-03 01:15:37 -07001125}
1126
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001127static void clone_init(struct dm_crypt_io *io, struct bio *clone)
Milan Broz8b004452006-10-03 01:15:37 -07001128{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001129 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001130
1131 clone->bi_private = io;
1132 clone->bi_end_io = crypt_endio;
1133 clone->bi_bdev = cc->dev->bdev;
1134 clone->bi_rw = io->base_bio->bi_rw;
1135}
1136
Milan Broz20c82532011-01-13 19:59:53 +00001137static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
Milan Broz8b004452006-10-03 01:15:37 -07001138{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001139 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001140 struct bio *clone;
Milan Broz93e605c2006-10-03 01:15:38 -07001141
Milan Broz8b004452006-10-03 01:15:37 -07001142 /*
Mike Snitzer59779072015-04-09 16:53:24 -04001143 * We need the original biovec array in order to decrypt
1144 * the whole bio data *afterwards* -- thanks to immutable
1145 * biovecs we don't need to worry about the block layer
1146 * modifying the biovec array; so leverage bio_clone_fast().
Milan Broz8b004452006-10-03 01:15:37 -07001147 */
Mike Snitzer59779072015-04-09 16:53:24 -04001148 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
Jens Axboe7eaceac2011-03-10 08:52:07 +01001149 if (!clone)
Milan Broz20c82532011-01-13 19:59:53 +00001150 return 1;
Milan Broz8b004452006-10-03 01:15:37 -07001151
Milan Broz20c82532011-01-13 19:59:53 +00001152 crypt_inc_pending(io);
1153
Milan Broz8b004452006-10-03 01:15:37 -07001154 clone_init(io, clone);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001155 clone->bi_iter.bi_sector = cc->start + io->sector;
Milan Broz8b004452006-10-03 01:15:37 -07001156
Milan Broz93e605c2006-10-03 01:15:38 -07001157 generic_make_request(clone);
Milan Broz20c82532011-01-13 19:59:53 +00001158 return 0;
Milan Broz8b004452006-10-03 01:15:37 -07001159}
1160
Mikulas Patockadc267622015-02-13 08:25:59 -05001161static void kcryptd_io_read_work(struct work_struct *work)
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001162{
1163 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1164
Mikulas Patockadc267622015-02-13 08:25:59 -05001165 crypt_inc_pending(io);
1166 if (kcryptd_io_read(io, GFP_NOIO))
1167 io->error = -ENOMEM;
1168 crypt_dec_pending(io);
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001169}
1170
Mikulas Patockadc267622015-02-13 08:25:59 -05001171static void kcryptd_queue_read(struct dm_crypt_io *io)
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001172{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001173 struct crypt_config *cc = io->cc;
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001174
Mikulas Patockadc267622015-02-13 08:25:59 -05001175 INIT_WORK(&io->work, kcryptd_io_read_work);
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001176 queue_work(cc->io_queue, &io->work);
1177}
1178
Mikulas Patockadc267622015-02-13 08:25:59 -05001179static void kcryptd_io_write(struct dm_crypt_io *io)
1180{
1181 struct bio *clone = io->ctx.bio_out;
1182
1183 generic_make_request(clone);
1184}
1185
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001186#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1187
Mikulas Patockadc267622015-02-13 08:25:59 -05001188static int dmcrypt_write(void *data)
1189{
1190 struct crypt_config *cc = data;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001191 struct dm_crypt_io *io;
1192
Mikulas Patockadc267622015-02-13 08:25:59 -05001193 while (1) {
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001194 struct rb_root write_tree;
Mikulas Patockadc267622015-02-13 08:25:59 -05001195 struct blk_plug plug;
1196
1197 DECLARE_WAITQUEUE(wait, current);
1198
1199 spin_lock_irq(&cc->write_thread_wait.lock);
1200continue_locked:
1201
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001202 if (!RB_EMPTY_ROOT(&cc->write_tree))
Mikulas Patockadc267622015-02-13 08:25:59 -05001203 goto pop_from_list;
1204
1205 __set_current_state(TASK_INTERRUPTIBLE);
1206 __add_wait_queue(&cc->write_thread_wait, &wait);
1207
1208 spin_unlock_irq(&cc->write_thread_wait.lock);
1209
1210 if (unlikely(kthread_should_stop())) {
1211 set_task_state(current, TASK_RUNNING);
1212 remove_wait_queue(&cc->write_thread_wait, &wait);
1213 break;
1214 }
1215
1216 schedule();
1217
1218 set_task_state(current, TASK_RUNNING);
1219 spin_lock_irq(&cc->write_thread_wait.lock);
1220 __remove_wait_queue(&cc->write_thread_wait, &wait);
1221 goto continue_locked;
1222
1223pop_from_list:
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001224 write_tree = cc->write_tree;
1225 cc->write_tree = RB_ROOT;
Mikulas Patockadc267622015-02-13 08:25:59 -05001226 spin_unlock_irq(&cc->write_thread_wait.lock);
1227
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001228 BUG_ON(rb_parent(write_tree.rb_node));
1229
1230 /*
1231 * Note: we cannot walk the tree here with rb_next because
1232 * the structures may be freed when kcryptd_io_write is called.
1233 */
Mikulas Patockadc267622015-02-13 08:25:59 -05001234 blk_start_plug(&plug);
1235 do {
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001236 io = crypt_io_from_node(rb_first(&write_tree));
1237 rb_erase(&io->rb_node, &write_tree);
Mikulas Patockadc267622015-02-13 08:25:59 -05001238 kcryptd_io_write(io);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001239 } while (!RB_EMPTY_ROOT(&write_tree));
Mikulas Patockadc267622015-02-13 08:25:59 -05001240 blk_finish_plug(&plug);
1241 }
1242 return 0;
1243}
1244
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001245static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
Milan Broz4e4eef62008-02-08 02:10:49 +00001246{
Milan Brozdec1ced2008-02-08 02:10:57 +00001247 struct bio *clone = io->ctx.bio_out;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001248 struct crypt_config *cc = io->cc;
Mikulas Patockadc267622015-02-13 08:25:59 -05001249 unsigned long flags;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001250 sector_t sector;
1251 struct rb_node **rbp, *parent;
Milan Brozdec1ced2008-02-08 02:10:57 +00001252
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001253 if (unlikely(io->error < 0)) {
Milan Brozdec1ced2008-02-08 02:10:57 +00001254 crypt_free_buffer_pages(cc, clone);
1255 bio_put(clone);
Milan Broz6c031f42008-10-10 13:37:06 +01001256 crypt_dec_pending(io);
Milan Brozdec1ced2008-02-08 02:10:57 +00001257 return;
1258 }
1259
1260 /* crypt_convert should have filled the clone bio */
Kent Overstreet003b5c52013-10-11 15:45:43 -07001261 BUG_ON(io->ctx.iter_out.bi_size);
Milan Brozdec1ced2008-02-08 02:10:57 +00001262
Kent Overstreet4f024f32013-10-11 15:44:27 -07001263 clone->bi_iter.bi_sector = cc->start + io->sector;
Milan Broz899c95d2008-02-08 02:11:02 +00001264
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001265 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1266 generic_make_request(clone);
1267 return;
1268 }
1269
Mikulas Patockadc267622015-02-13 08:25:59 -05001270 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001271 rbp = &cc->write_tree.rb_node;
1272 parent = NULL;
1273 sector = io->sector;
1274 while (*rbp) {
1275 parent = *rbp;
1276 if (sector < crypt_io_from_node(parent)->sector)
1277 rbp = &(*rbp)->rb_left;
1278 else
1279 rbp = &(*rbp)->rb_right;
1280 }
1281 rb_link_node(&io->rb_node, parent, rbp);
1282 rb_insert_color(&io->rb_node, &cc->write_tree);
1283
Mikulas Patockadc267622015-02-13 08:25:59 -05001284 wake_up_locked(&cc->write_thread_wait);
1285 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
Milan Broz4e4eef62008-02-08 02:10:49 +00001286}
1287
Milan Brozfc5a5e92008-10-10 13:37:04 +01001288static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
Milan Broz8b004452006-10-03 01:15:37 -07001289{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001290 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001291 struct bio *clone;
Milan Brozc8081612008-10-10 13:37:08 +01001292 int crypt_finished;
Milan Brozb635b002008-10-21 17:45:00 +01001293 sector_t sector = io->sector;
Milan Brozdec1ced2008-02-08 02:10:57 +00001294 int r;
Milan Broz8b004452006-10-03 01:15:37 -07001295
Milan Broz93e605c2006-10-03 01:15:38 -07001296 /*
Milan Brozfc5a5e92008-10-10 13:37:04 +01001297 * Prevent io from disappearing until this function completes.
1298 */
1299 crypt_inc_pending(io);
Milan Brozb635b002008-10-21 17:45:00 +01001300 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
Milan Brozfc5a5e92008-10-10 13:37:04 +01001301
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001302 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1303 if (unlikely(!clone)) {
1304 io->error = -EIO;
1305 goto dec;
Milan Broz8b004452006-10-03 01:15:37 -07001306 }
Milan Broz899c95d2008-02-08 02:11:02 +00001307
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001308 io->ctx.bio_out = clone;
1309 io->ctx.iter_out = clone->bi_iter;
1310
1311 sector += bio_sectors(clone);
1312
1313 crypt_inc_pending(io);
1314 r = crypt_convert(cc, &io->ctx);
1315 if (r)
1316 io->error = -EIO;
1317 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
1318
1319 /* Encryption was already finished, submit io now */
1320 if (crypt_finished) {
1321 kcryptd_crypt_write_io_submit(io, 0);
1322 io->sector = sector;
1323 }
1324
1325dec:
Milan Broz899c95d2008-02-08 02:11:02 +00001326 crypt_dec_pending(io);
Milan Broz84131db2008-02-08 02:10:59 +00001327}
1328
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001329static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
Milan Broz5742fd72008-02-08 02:10:43 +00001330{
Milan Broz5742fd72008-02-08 02:10:43 +00001331 crypt_dec_pending(io);
1332}
1333
Milan Broz4e4eef62008-02-08 02:10:49 +00001334static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
Milan Broz8b004452006-10-03 01:15:37 -07001335{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001336 struct crypt_config *cc = io->cc;
Milan Broz5742fd72008-02-08 02:10:43 +00001337 int r = 0;
Milan Broz8b004452006-10-03 01:15:37 -07001338
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001339 crypt_inc_pending(io);
Milan Broz3a7f6c92008-02-08 02:11:14 +00001340
Milan Broz53017032008-02-08 02:10:38 +00001341 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
Milan Broz0c395b02008-02-08 02:10:54 +00001342 io->sector);
Milan Broz8b004452006-10-03 01:15:37 -07001343
Milan Broz5742fd72008-02-08 02:10:43 +00001344 r = crypt_convert(cc, &io->ctx);
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001345 if (r < 0)
1346 io->error = -EIO;
Milan Broz5742fd72008-02-08 02:10:43 +00001347
Mikulas Patocka40b62292012-07-27 15:08:04 +01001348 if (atomic_dec_and_test(&io->ctx.cc_pending))
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001349 kcryptd_crypt_read_done(io);
Milan Broz3a7f6c92008-02-08 02:11:14 +00001350
1351 crypt_dec_pending(io);
Milan Broz8b004452006-10-03 01:15:37 -07001352}
1353
Milan Broz95497a92008-02-08 02:11:12 +00001354static void kcryptd_async_done(struct crypto_async_request *async_req,
1355 int error)
1356{
Huang Yingb2174ee2009-03-16 17:44:33 +00001357 struct dm_crypt_request *dmreq = async_req->data;
1358 struct convert_context *ctx = dmreq->ctx;
Milan Broz95497a92008-02-08 02:11:12 +00001359 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001360 struct crypt_config *cc = io->cc;
Milan Broz95497a92008-02-08 02:11:12 +00001361
Milan Broz54cea3f2015-05-15 17:00:25 +02001362 /*
1363 * A request from crypto driver backlog is going to be processed now,
1364 * finish the completion and continue in crypt_convert().
1365 * (Callback will be called for the second time for this request.)
1366 */
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001367 if (error == -EINPROGRESS) {
1368 complete(&ctx->restart);
Milan Broz95497a92008-02-08 02:11:12 +00001369 return;
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001370 }
Milan Broz95497a92008-02-08 02:11:12 +00001371
Milan Broz2dc53272011-01-13 19:59:54 +00001372 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
1373 error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq);
1374
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001375 if (error < 0)
1376 io->error = -EIO;
1377
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001378 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
Milan Broz95497a92008-02-08 02:11:12 +00001379
Mikulas Patocka40b62292012-07-27 15:08:04 +01001380 if (!atomic_dec_and_test(&ctx->cc_pending))
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001381 return;
Milan Broz95497a92008-02-08 02:11:12 +00001382
1383 if (bio_data_dir(io->base_bio) == READ)
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001384 kcryptd_crypt_read_done(io);
Milan Broz95497a92008-02-08 02:11:12 +00001385 else
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001386 kcryptd_crypt_write_io_submit(io, 1);
Milan Broz95497a92008-02-08 02:11:12 +00001387}
1388
Milan Broz4e4eef62008-02-08 02:10:49 +00001389static void kcryptd_crypt(struct work_struct *work)
1390{
1391 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1392
1393 if (bio_data_dir(io->base_bio) == READ)
1394 kcryptd_crypt_read_convert(io);
1395 else
1396 kcryptd_crypt_write_convert(io);
Milan Broz8b004452006-10-03 01:15:37 -07001397}
1398
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001399static void kcryptd_queue_crypt(struct dm_crypt_io *io)
1400{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001401 struct crypt_config *cc = io->cc;
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001402
1403 INIT_WORK(&io->work, kcryptd_crypt);
1404 queue_work(cc->crypt_queue, &io->work);
1405}
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407/*
1408 * Decode key from its hex representation
1409 */
1410static int crypt_decode_key(u8 *key, char *hex, unsigned int size)
1411{
1412 char buffer[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 unsigned int i;
1414
1415 buffer[2] = '\0';
1416
Milan Broz8b004452006-10-03 01:15:37 -07001417 for (i = 0; i < size; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 buffer[0] = *hex++;
1419 buffer[1] = *hex++;
1420
majianpeng1a66a082012-07-27 15:07:59 +01001421 if (kstrtou8(buffer, 16, &key[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 return -EINVAL;
1423 }
1424
1425 if (*hex != '\0')
1426 return -EINVAL;
1427
1428 return 0;
1429}
1430
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001431static void crypt_free_tfms(struct crypt_config *cc)
Milan Brozd1f96422011-01-13 19:59:54 +00001432{
Milan Brozd1f96422011-01-13 19:59:54 +00001433 unsigned i;
1434
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001435 if (!cc->tfms)
1436 return;
1437
Milan Brozd1f96422011-01-13 19:59:54 +00001438 for (i = 0; i < cc->tfms_count; i++)
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001439 if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) {
1440 crypto_free_ablkcipher(cc->tfms[i]);
1441 cc->tfms[i] = NULL;
Milan Brozd1f96422011-01-13 19:59:54 +00001442 }
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001443
1444 kfree(cc->tfms);
1445 cc->tfms = NULL;
Milan Brozd1f96422011-01-13 19:59:54 +00001446}
1447
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001448static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
Milan Brozd1f96422011-01-13 19:59:54 +00001449{
Milan Brozd1f96422011-01-13 19:59:54 +00001450 unsigned i;
1451 int err;
1452
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001453 cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *),
1454 GFP_KERNEL);
1455 if (!cc->tfms)
1456 return -ENOMEM;
1457
Milan Brozd1f96422011-01-13 19:59:54 +00001458 for (i = 0; i < cc->tfms_count; i++) {
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001459 cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0);
1460 if (IS_ERR(cc->tfms[i])) {
1461 err = PTR_ERR(cc->tfms[i]);
1462 crypt_free_tfms(cc);
Milan Brozd1f96422011-01-13 19:59:54 +00001463 return err;
1464 }
1465 }
1466
1467 return 0;
1468}
1469
Andi Kleenc0297722011-01-13 19:59:53 +00001470static int crypt_setkey_allcpus(struct crypt_config *cc)
1471{
Milan Brozda31a072013-10-28 23:21:03 +01001472 unsigned subkey_size;
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001473 int err = 0, i, r;
Andi Kleenc0297722011-01-13 19:59:53 +00001474
Milan Brozda31a072013-10-28 23:21:03 +01001475 /* Ignore extra keys (which are used for IV etc) */
1476 subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1477
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001478 for (i = 0; i < cc->tfms_count; i++) {
1479 r = crypto_ablkcipher_setkey(cc->tfms[i],
1480 cc->key + (i * subkey_size),
1481 subkey_size);
1482 if (r)
1483 err = r;
Andi Kleenc0297722011-01-13 19:59:53 +00001484 }
1485
1486 return err;
1487}
1488
Milan Broze48d4bb2006-10-03 01:15:37 -07001489static int crypt_set_key(struct crypt_config *cc, char *key)
1490{
Milan Brozde8be5a2011-03-24 13:54:27 +00001491 int r = -EINVAL;
1492 int key_string_len = strlen(key);
1493
Milan Broz69a8cfc2011-01-13 19:59:49 +00001494 /* The key size may not be changed. */
Milan Brozde8be5a2011-03-24 13:54:27 +00001495 if (cc->key_size != (key_string_len >> 1))
1496 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001497
Milan Broz69a8cfc2011-01-13 19:59:49 +00001498 /* Hyphen (which gives a key_size of zero) means there is no key. */
1499 if (!cc->key_size && strcmp(key, "-"))
Milan Brozde8be5a2011-03-24 13:54:27 +00001500 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001501
Milan Broz69a8cfc2011-01-13 19:59:49 +00001502 if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
Milan Brozde8be5a2011-03-24 13:54:27 +00001503 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001504
1505 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
1506
Milan Brozde8be5a2011-03-24 13:54:27 +00001507 r = crypt_setkey_allcpus(cc);
1508
1509out:
1510 /* Hex key string not needed after here, so wipe it. */
1511 memset(key, '0', key_string_len);
1512
1513 return r;
Milan Broze48d4bb2006-10-03 01:15:37 -07001514}
1515
1516static int crypt_wipe_key(struct crypt_config *cc)
1517{
1518 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
1519 memset(&cc->key, 0, cc->key_size * sizeof(u8));
Andi Kleenc0297722011-01-13 19:59:53 +00001520
1521 return crypt_setkey_allcpus(cc);
Milan Broze48d4bb2006-10-03 01:15:37 -07001522}
1523
Milan Broz28513fc2010-08-12 04:14:06 +01001524static void crypt_dtr(struct dm_target *ti)
1525{
1526 struct crypt_config *cc = ti->private;
1527
1528 ti->private = NULL;
1529
1530 if (!cc)
1531 return;
1532
Mikulas Patockadc267622015-02-13 08:25:59 -05001533 if (cc->write_thread)
1534 kthread_stop(cc->write_thread);
1535
Milan Broz28513fc2010-08-12 04:14:06 +01001536 if (cc->io_queue)
1537 destroy_workqueue(cc->io_queue);
1538 if (cc->crypt_queue)
1539 destroy_workqueue(cc->crypt_queue);
1540
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001541 crypt_free_tfms(cc);
1542
Milan Broz28513fc2010-08-12 04:14:06 +01001543 if (cc->bs)
1544 bioset_free(cc->bs);
1545
1546 if (cc->page_pool)
1547 mempool_destroy(cc->page_pool);
1548 if (cc->req_pool)
1549 mempool_destroy(cc->req_pool);
Milan Broz28513fc2010-08-12 04:14:06 +01001550
1551 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
1552 cc->iv_gen_ops->dtr(cc);
1553
Milan Broz28513fc2010-08-12 04:14:06 +01001554 if (cc->dev)
1555 dm_put_device(ti, cc->dev);
1556
Milan Broz5ebaee62010-08-12 04:14:07 +01001557 kzfree(cc->cipher);
Milan Broz7dbcd132011-01-13 19:59:52 +00001558 kzfree(cc->cipher_string);
Milan Broz28513fc2010-08-12 04:14:06 +01001559
1560 /* Must zero key material before freeing */
1561 kzfree(cc);
1562}
1563
Milan Broz5ebaee62010-08-12 04:14:07 +01001564static int crypt_ctr_cipher(struct dm_target *ti,
1565 char *cipher_in, char *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566{
Milan Broz5ebaee62010-08-12 04:14:07 +01001567 struct crypt_config *cc = ti->private;
Milan Brozd1f96422011-01-13 19:59:54 +00001568 char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount;
Milan Broz5ebaee62010-08-12 04:14:07 +01001569 char *cipher_api = NULL;
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001570 int ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001571 char dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572
Milan Broz5ebaee62010-08-12 04:14:07 +01001573 /* Convert to crypto api definition? */
1574 if (strchr(cipher_in, '(')) {
1575 ti->error = "Bad cipher specification";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 return -EINVAL;
1577 }
1578
Milan Broz7dbcd132011-01-13 19:59:52 +00001579 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
1580 if (!cc->cipher_string)
1581 goto bad_mem;
1582
Milan Broz5ebaee62010-08-12 04:14:07 +01001583 /*
1584 * Legacy dm-crypt cipher specification
Milan Brozd1f96422011-01-13 19:59:54 +00001585 * cipher[:keycount]-mode-iv:ivopts
Milan Broz5ebaee62010-08-12 04:14:07 +01001586 */
1587 tmp = cipher_in;
Milan Brozd1f96422011-01-13 19:59:54 +00001588 keycount = strsep(&tmp, "-");
1589 cipher = strsep(&keycount, ":");
1590
1591 if (!keycount)
1592 cc->tfms_count = 1;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001593 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
Milan Brozd1f96422011-01-13 19:59:54 +00001594 !is_power_of_2(cc->tfms_count)) {
1595 ti->error = "Bad cipher key count specification";
1596 return -EINVAL;
1597 }
1598 cc->key_parts = cc->tfms_count;
Milan Brozda31a072013-10-28 23:21:03 +01001599 cc->key_extra_size = 0;
Milan Broz5ebaee62010-08-12 04:14:07 +01001600
1601 cc->cipher = kstrdup(cipher, GFP_KERNEL);
1602 if (!cc->cipher)
1603 goto bad_mem;
1604
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 chainmode = strsep(&tmp, "-");
1606 ivopts = strsep(&tmp, "-");
1607 ivmode = strsep(&ivopts, ":");
1608
1609 if (tmp)
Milan Broz5ebaee62010-08-12 04:14:07 +01001610 DMWARN("Ignoring unexpected additional cipher options");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
Milan Broz7dbcd132011-01-13 19:59:52 +00001612 /*
1613 * For compatibility with the original dm-crypt mapping format, if
1614 * only the cipher name is supplied, use cbc-plain.
1615 */
Milan Broz5ebaee62010-08-12 04:14:07 +01001616 if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 chainmode = "cbc";
1618 ivmode = "plain";
1619 }
1620
Herbert Xud1806f62006-08-22 20:29:17 +10001621 if (strcmp(chainmode, "ecb") && !ivmode) {
Milan Broz5ebaee62010-08-12 04:14:07 +01001622 ti->error = "IV mechanism required";
1623 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 }
1625
Milan Broz5ebaee62010-08-12 04:14:07 +01001626 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
1627 if (!cipher_api)
1628 goto bad_mem;
1629
1630 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
1631 "%s(%s)", chainmode, cipher);
1632 if (ret < 0) {
1633 kfree(cipher_api);
1634 goto bad_mem;
Herbert Xud1806f62006-08-22 20:29:17 +10001635 }
1636
Milan Broz5ebaee62010-08-12 04:14:07 +01001637 /* Allocate cipher */
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001638 ret = crypt_alloc_tfms(cc, cipher_api);
1639 if (ret < 0) {
1640 ti->error = "Error allocating crypto tfm";
1641 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
Milan Broz5ebaee62010-08-12 04:14:07 +01001644 /* Initialize IV */
Andi Kleenc0297722011-01-13 19:59:53 +00001645 cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc));
Milan Broz5ebaee62010-08-12 04:14:07 +01001646 if (cc->iv_size)
1647 /* at least a 64 bit sector number should fit in our buffer */
1648 cc->iv_size = max(cc->iv_size,
1649 (unsigned int)(sizeof(u64) / sizeof(u8)));
1650 else if (ivmode) {
1651 DMWARN("Selected cipher does not support IVs");
1652 ivmode = NULL;
1653 }
1654
1655 /* Choose ivmode, see comments at iv code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 if (ivmode == NULL)
1657 cc->iv_gen_ops = NULL;
1658 else if (strcmp(ivmode, "plain") == 0)
1659 cc->iv_gen_ops = &crypt_iv_plain_ops;
Milan Broz61afef62009-12-10 23:52:25 +00001660 else if (strcmp(ivmode, "plain64") == 0)
1661 cc->iv_gen_ops = &crypt_iv_plain64_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 else if (strcmp(ivmode, "essiv") == 0)
1663 cc->iv_gen_ops = &crypt_iv_essiv_ops;
Rik Snel48527fa2006-09-03 08:56:39 +10001664 else if (strcmp(ivmode, "benbi") == 0)
1665 cc->iv_gen_ops = &crypt_iv_benbi_ops;
Ludwig Nussel46b47732007-05-09 02:32:55 -07001666 else if (strcmp(ivmode, "null") == 0)
1667 cc->iv_gen_ops = &crypt_iv_null_ops;
Milan Broz34745782011-01-13 19:59:55 +00001668 else if (strcmp(ivmode, "lmk") == 0) {
1669 cc->iv_gen_ops = &crypt_iv_lmk_ops;
Milan Brozed04d982013-10-28 23:21:04 +01001670 /*
1671 * Version 2 and 3 is recognised according
Milan Broz34745782011-01-13 19:59:55 +00001672 * to length of provided multi-key string.
1673 * If present (version 3), last key is used as IV seed.
Milan Brozed04d982013-10-28 23:21:04 +01001674 * All keys (including IV seed) are always the same size.
Milan Broz34745782011-01-13 19:59:55 +00001675 */
Milan Brozda31a072013-10-28 23:21:03 +01001676 if (cc->key_size % cc->key_parts) {
Milan Broz34745782011-01-13 19:59:55 +00001677 cc->key_parts++;
Milan Brozda31a072013-10-28 23:21:03 +01001678 cc->key_extra_size = cc->key_size / cc->key_parts;
1679 }
Milan Brozed04d982013-10-28 23:21:04 +01001680 } else if (strcmp(ivmode, "tcw") == 0) {
1681 cc->iv_gen_ops = &crypt_iv_tcw_ops;
1682 cc->key_parts += 2; /* IV + whitening */
1683 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
Milan Broz34745782011-01-13 19:59:55 +00001684 } else {
Milan Broz5ebaee62010-08-12 04:14:07 +01001685 ret = -EINVAL;
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001686 ti->error = "Invalid IV mode";
Milan Broz28513fc2010-08-12 04:14:06 +01001687 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 }
1689
Milan Brozda31a072013-10-28 23:21:03 +01001690 /* Initialize and set key */
1691 ret = crypt_set_key(cc, key);
1692 if (ret < 0) {
1693 ti->error = "Error decoding and setting key";
1694 goto bad;
1695 }
1696
Milan Broz28513fc2010-08-12 04:14:06 +01001697 /* Allocate IV */
1698 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
1699 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
1700 if (ret < 0) {
1701 ti->error = "Error creating IV";
1702 goto bad;
1703 }
Milan Brozb95bf2d2009-12-10 23:51:56 +00001704 }
1705
Milan Broz28513fc2010-08-12 04:14:06 +01001706 /* Initialize IV (set keys for ESSIV etc) */
1707 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
1708 ret = cc->iv_gen_ops->init(cc);
1709 if (ret < 0) {
1710 ti->error = "Error initialising IV";
1711 goto bad;
1712 }
1713 }
1714
Milan Broz5ebaee62010-08-12 04:14:07 +01001715 ret = 0;
1716bad:
1717 kfree(cipher_api);
1718 return ret;
1719
1720bad_mem:
1721 ti->error = "Cannot allocate cipher strings";
1722 return -ENOMEM;
1723}
1724
1725/*
1726 * Construct an encryption mapping:
1727 * <cipher> <key> <iv_offset> <dev_path> <start>
1728 */
1729static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
1730{
1731 struct crypt_config *cc;
Milan Broz772ae5f2011-08-02 12:32:08 +01001732 unsigned int key_size, opt_params;
Milan Broz5ebaee62010-08-12 04:14:07 +01001733 unsigned long long tmpll;
1734 int ret;
Mikulas Patockad49ec522014-08-28 11:09:31 -04001735 size_t iv_size_padding;
Milan Broz772ae5f2011-08-02 12:32:08 +01001736 struct dm_arg_set as;
1737 const char *opt_string;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001738 char dummy;
Milan Broz5ebaee62010-08-12 04:14:07 +01001739
Milan Broz772ae5f2011-08-02 12:32:08 +01001740 static struct dm_arg _args[] = {
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001741 {0, 3, "Invalid number of feature args"},
Milan Broz772ae5f2011-08-02 12:32:08 +01001742 };
1743
1744 if (argc < 5) {
Milan Broz5ebaee62010-08-12 04:14:07 +01001745 ti->error = "Not enough arguments";
1746 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 }
1748
Milan Broz5ebaee62010-08-12 04:14:07 +01001749 key_size = strlen(argv[1]) >> 1;
1750
1751 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
1752 if (!cc) {
1753 ti->error = "Cannot allocate encryption context";
1754 return -ENOMEM;
1755 }
Milan Broz69a8cfc2011-01-13 19:59:49 +00001756 cc->key_size = key_size;
Milan Broz5ebaee62010-08-12 04:14:07 +01001757
1758 ti->private = cc;
1759 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
1760 if (ret < 0)
1761 goto bad;
1762
Milan Brozddd42ed2008-02-08 02:11:07 +00001763 cc->dmreq_start = sizeof(struct ablkcipher_request);
Andi Kleenc0297722011-01-13 19:59:53 +00001764 cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc));
Mikulas Patockad49ec522014-08-28 11:09:31 -04001765 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
1766
1767 if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) {
1768 /* Allocate the padding exactly */
1769 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
1770 & crypto_ablkcipher_alignmask(any_tfm(cc));
1771 } else {
1772 /*
1773 * If the cipher requires greater alignment than kmalloc
1774 * alignment, we don't know the exact position of the
1775 * initialization vector. We must assume worst case.
1776 */
1777 iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc));
1778 }
Milan Brozddd42ed2008-02-08 02:11:07 +00001779
Mikulas Patocka94f5e022015-02-13 08:25:26 -05001780 ret = -ENOMEM;
Milan Brozddd42ed2008-02-08 02:11:07 +00001781 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
Mikulas Patockad49ec522014-08-28 11:09:31 -04001782 sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size);
Milan Brozddd42ed2008-02-08 02:11:07 +00001783 if (!cc->req_pool) {
1784 ti->error = "Cannot allocate crypt request mempool";
Milan Broz28513fc2010-08-12 04:14:06 +01001785 goto bad;
Milan Brozddd42ed2008-02-08 02:11:07 +00001786 }
Milan Brozddd42ed2008-02-08 02:11:07 +00001787
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001788 cc->per_bio_data_size = ti->per_bio_data_size =
Mikulas Patockad49ec522014-08-28 11:09:31 -04001789 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start +
1790 sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size,
1791 ARCH_KMALLOC_MINALIGN);
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001792
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001793 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 if (!cc->page_pool) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001795 ti->error = "Cannot allocate page mempool";
Milan Broz28513fc2010-08-12 04:14:06 +01001796 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 }
1798
Jens Axboebb799ca2008-12-10 15:35:05 +01001799 cc->bs = bioset_create(MIN_IOS, 0);
Milan Broz6a24c712006-10-03 01:15:40 -07001800 if (!cc->bs) {
1801 ti->error = "Cannot allocate crypt bioset";
Milan Broz28513fc2010-08-12 04:14:06 +01001802 goto bad;
Milan Broz6a24c712006-10-03 01:15:40 -07001803 }
1804
Mikulas Patocka7145c242015-02-13 08:24:41 -05001805 mutex_init(&cc->bio_alloc_lock);
1806
Milan Broz28513fc2010-08-12 04:14:06 +01001807 ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001808 if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001809 ti->error = "Invalid iv_offset sector";
Milan Broz28513fc2010-08-12 04:14:06 +01001810 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 }
Andrew Morton4ee218c2006-03-27 01:17:48 -08001812 cc->iv_offset = tmpll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813
Vivek Goyale80d1c82015-07-31 09:20:36 -04001814 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
1815 if (ret) {
Milan Broz28513fc2010-08-12 04:14:06 +01001816 ti->error = "Device lookup failed";
1817 goto bad;
1818 }
1819
Vivek Goyale80d1c82015-07-31 09:20:36 -04001820 ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001821 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001822 ti->error = "Invalid device sector";
Milan Broz28513fc2010-08-12 04:14:06 +01001823 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 }
Andrew Morton4ee218c2006-03-27 01:17:48 -08001825 cc->start = tmpll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826
Milan Broz772ae5f2011-08-02 12:32:08 +01001827 argv += 5;
1828 argc -= 5;
1829
1830 /* Optional parameters */
1831 if (argc) {
1832 as.argc = argc;
1833 as.argv = argv;
1834
1835 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
1836 if (ret)
1837 goto bad;
1838
Wei Yongjun44c144f2015-04-16 22:00:50 -04001839 ret = -EINVAL;
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001840 while (opt_params--) {
1841 opt_string = dm_shift_arg(&as);
1842 if (!opt_string) {
1843 ti->error = "Not enough feature arguments";
1844 goto bad;
1845 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001846
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001847 if (!strcasecmp(opt_string, "allow_discards"))
1848 ti->num_discard_bios = 1;
1849
1850 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
1851 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
1852
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001853 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
1854 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
1855
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001856 else {
1857 ti->error = "Invalid feature arguments";
1858 goto bad;
1859 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001860 }
1861 }
1862
Milan Broz28513fc2010-08-12 04:14:06 +01001863 ret = -ENOMEM;
Tejun Heo670368a2013-07-30 08:40:21 -04001864 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
Milan Brozcabf08e2007-10-19 22:38:58 +01001865 if (!cc->io_queue) {
1866 ti->error = "Couldn't create kcryptd io queue";
Milan Broz28513fc2010-08-12 04:14:06 +01001867 goto bad;
Milan Brozcabf08e2007-10-19 22:38:58 +01001868 }
1869
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001870 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
1871 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
1872 else
1873 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
1874 num_online_cpus());
Milan Brozcabf08e2007-10-19 22:38:58 +01001875 if (!cc->crypt_queue) {
Milan Broz9934a8b2007-10-19 22:38:57 +01001876 ti->error = "Couldn't create kcryptd queue";
Milan Broz28513fc2010-08-12 04:14:06 +01001877 goto bad;
Milan Broz9934a8b2007-10-19 22:38:57 +01001878 }
1879
Mikulas Patockadc267622015-02-13 08:25:59 -05001880 init_waitqueue_head(&cc->write_thread_wait);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001881 cc->write_tree = RB_ROOT;
Mikulas Patockadc267622015-02-13 08:25:59 -05001882
1883 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
1884 if (IS_ERR(cc->write_thread)) {
1885 ret = PTR_ERR(cc->write_thread);
1886 cc->write_thread = NULL;
1887 ti->error = "Couldn't spawn write thread";
1888 goto bad;
1889 }
1890 wake_up_process(cc->write_thread);
1891
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +00001892 ti->num_flush_bios = 1;
Alasdair G Kergon0ac55482012-07-27 15:08:08 +01001893 ti->discard_zeroes_data_unsupported = true;
Milan Broz983c7db2011-09-25 23:26:21 +01001894
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 return 0;
1896
Milan Broz28513fc2010-08-12 04:14:06 +01001897bad:
1898 crypt_dtr(ti);
1899 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900}
1901
Mikulas Patocka7de3ee52012-12-21 20:23:41 +00001902static int crypt_map(struct dm_target *ti, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903{
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001904 struct dm_crypt_io *io;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001905 struct crypt_config *cc = ti->private;
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001906
Milan Broz772ae5f2011-08-02 12:32:08 +01001907 /*
1908 * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues.
1909 * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight
1910 * - for REQ_DISCARD caller must use flush if IO ordering matters
1911 */
1912 if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001913 bio->bi_bdev = cc->dev->bdev;
Milan Broz772ae5f2011-08-02 12:32:08 +01001914 if (bio_sectors(bio))
Kent Overstreet4f024f32013-10-11 15:44:27 -07001915 bio->bi_iter.bi_sector = cc->start +
1916 dm_target_offset(ti, bio->bi_iter.bi_sector);
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001917 return DM_MAPIO_REMAPPED;
1918 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001920 io = dm_per_bio_data(bio, cc->per_bio_data_size);
1921 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
1922 io->ctx.req = (struct ablkcipher_request *)(io + 1);
Milan Brozcabf08e2007-10-19 22:38:58 +01001923
Milan Broz20c82532011-01-13 19:59:53 +00001924 if (bio_data_dir(io->base_bio) == READ) {
1925 if (kcryptd_io_read(io, GFP_NOWAIT))
Mikulas Patockadc267622015-02-13 08:25:59 -05001926 kcryptd_queue_read(io);
Milan Broz20c82532011-01-13 19:59:53 +00001927 } else
Milan Brozcabf08e2007-10-19 22:38:58 +01001928 kcryptd_queue_crypt(io);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929
Kiyoshi Uedad2a7ad22006-12-08 02:41:06 -08001930 return DM_MAPIO_SUBMITTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931}
1932
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001933static void crypt_status(struct dm_target *ti, status_type_t type,
1934 unsigned status_flags, char *result, unsigned maxlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935{
Milan Broz5ebaee62010-08-12 04:14:07 +01001936 struct crypt_config *cc = ti->private;
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001937 unsigned i, sz = 0;
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001938 int num_feature_args = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 switch (type) {
1941 case STATUSTYPE_INFO:
1942 result[0] = '\0';
1943 break;
1944
1945 case STATUSTYPE_TABLE:
Milan Broz7dbcd132011-01-13 19:59:52 +00001946 DMEMIT("%s ", cc->cipher_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001948 if (cc->key_size > 0)
1949 for (i = 0; i < cc->key_size; i++)
1950 DMEMIT("%02x", cc->key[i]);
1951 else
1952 DMEMIT("-");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
Andrew Morton4ee218c2006-03-27 01:17:48 -08001954 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
1955 cc->dev->name, (unsigned long long)cc->start);
Milan Broz772ae5f2011-08-02 12:32:08 +01001956
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001957 num_feature_args += !!ti->num_discard_bios;
1958 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001959 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001960 if (num_feature_args) {
1961 DMEMIT(" %d", num_feature_args);
1962 if (ti->num_discard_bios)
1963 DMEMIT(" allow_discards");
1964 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
1965 DMEMIT(" same_cpu_crypt");
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001966 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
1967 DMEMIT(" submit_from_crypt_cpus");
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001968 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001969
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 break;
1971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972}
1973
Milan Broze48d4bb2006-10-03 01:15:37 -07001974static void crypt_postsuspend(struct dm_target *ti)
1975{
1976 struct crypt_config *cc = ti->private;
1977
1978 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
1979}
1980
1981static int crypt_preresume(struct dm_target *ti)
1982{
1983 struct crypt_config *cc = ti->private;
1984
1985 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
1986 DMERR("aborting resume - crypt key is not set.");
1987 return -EAGAIN;
1988 }
1989
1990 return 0;
1991}
1992
1993static void crypt_resume(struct dm_target *ti)
1994{
1995 struct crypt_config *cc = ti->private;
1996
1997 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
1998}
1999
2000/* Message interface
2001 * key set <key>
2002 * key wipe
2003 */
2004static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2005{
2006 struct crypt_config *cc = ti->private;
Milan Broz542da312009-12-10 23:51:57 +00002007 int ret = -EINVAL;
Milan Broze48d4bb2006-10-03 01:15:37 -07002008
2009 if (argc < 2)
2010 goto error;
2011
Mike Snitzer498f0102011-08-02 12:32:04 +01002012 if (!strcasecmp(argv[0], "key")) {
Milan Broze48d4bb2006-10-03 01:15:37 -07002013 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2014 DMWARN("not suspended during key manipulation.");
2015 return -EINVAL;
2016 }
Mike Snitzer498f0102011-08-02 12:32:04 +01002017 if (argc == 3 && !strcasecmp(argv[1], "set")) {
Milan Broz542da312009-12-10 23:51:57 +00002018 ret = crypt_set_key(cc, argv[2]);
2019 if (ret)
2020 return ret;
2021 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2022 ret = cc->iv_gen_ops->init(cc);
2023 return ret;
2024 }
Mike Snitzer498f0102011-08-02 12:32:04 +01002025 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
Milan Broz542da312009-12-10 23:51:57 +00002026 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2027 ret = cc->iv_gen_ops->wipe(cc);
2028 if (ret)
2029 return ret;
2030 }
Milan Broze48d4bb2006-10-03 01:15:37 -07002031 return crypt_wipe_key(cc);
Milan Broz542da312009-12-10 23:51:57 +00002032 }
Milan Broze48d4bb2006-10-03 01:15:37 -07002033 }
2034
2035error:
2036 DMWARN("unrecognised message received.");
2037 return -EINVAL;
2038}
2039
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002040static int crypt_iterate_devices(struct dm_target *ti,
2041 iterate_devices_callout_fn fn, void *data)
2042{
2043 struct crypt_config *cc = ti->private;
2044
Mike Snitzer5dea2712009-07-23 20:30:42 +01002045 return fn(ti, cc->dev, cc->start, ti->len, data);
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002046}
2047
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048static struct target_type crypt_target = {
2049 .name = "crypt",
Mikulas Patockaf3396c582015-02-13 08:23:09 -05002050 .version = {1, 14, 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 .module = THIS_MODULE,
2052 .ctr = crypt_ctr,
2053 .dtr = crypt_dtr,
2054 .map = crypt_map,
2055 .status = crypt_status,
Milan Broze48d4bb2006-10-03 01:15:37 -07002056 .postsuspend = crypt_postsuspend,
2057 .preresume = crypt_preresume,
2058 .resume = crypt_resume,
2059 .message = crypt_message,
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002060 .iterate_devices = crypt_iterate_devices,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061};
2062
2063static int __init dm_crypt_init(void)
2064{
2065 int r;
2066
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 r = dm_register_target(&crypt_target);
Mikulas Patocka94f5e022015-02-13 08:25:26 -05002068 if (r < 0)
Alasdair G Kergon72d94862006-06-26 00:27:35 -07002069 DMERR("register failed %d", r);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 return r;
2072}
2073
2074static void __exit dm_crypt_exit(void)
2075{
Mikulas Patocka10d3bd02009-01-06 03:04:58 +00002076 dm_unregister_target(&crypt_target);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077}
2078
2079module_init(dm_crypt_init);
2080module_exit(dm_crypt_exit);
2081
Jana Saoutbf142992014-06-24 14:27:04 -04002082MODULE_AUTHOR("Jana Saout <jana@saout.de>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
2084MODULE_LICENSE("GPL");