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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>
Herbert Xubbdb23b2016-01-24 21:16:36 +080031#include <crypto/skcipher.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Mikulas Patocka586e80e2008-10-21 17:44:59 +010033#include <linux/device-mapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Alasdair G Kergon72d94862006-06-26 00:27:35 -070035#define DM_MSG_PREFIX "crypt"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 * context holding the current state of a multi-part conversion
39 */
40struct convert_context {
Milan Broz43d69032008-02-08 02:11:09 +000041 struct completion restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 struct bio *bio_in;
43 struct bio *bio_out;
Kent Overstreet003b5c52013-10-11 15:45:43 -070044 struct bvec_iter iter_in;
45 struct bvec_iter iter_out;
Mikulas Patockac66029f2012-07-27 15:08:05 +010046 sector_t cc_sector;
Mikulas Patocka40b62292012-07-27 15:08:04 +010047 atomic_t cc_pending;
Herbert Xubbdb23b2016-01-24 21:16:36 +080048 struct skcipher_request *req;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049};
50
Milan Broz53017032008-02-08 02:10:38 +000051/*
52 * per bio private data
53 */
54struct dm_crypt_io {
Alasdair G Kergon49a8a922012-07-27 15:08:05 +010055 struct crypt_config *cc;
Milan Broz53017032008-02-08 02:10:38 +000056 struct bio *base_bio;
57 struct work_struct work;
58
59 struct convert_context ctx;
60
Mikulas Patocka40b62292012-07-27 15:08:04 +010061 atomic_t io_pending;
Milan Broz53017032008-02-08 02:10:38 +000062 int error;
Milan Broz0c395b02008-02-08 02:10:54 +000063 sector_t sector;
Mikulas Patockadc267622015-02-13 08:25:59 -050064
Mikulas Patockab3c5fd32015-02-13 08:27:41 -050065 struct rb_node rb_node;
Mikulas Patocka298a9fa2014-03-28 15:51:55 -040066} CRYPTO_MINALIGN_ATTR;
Milan Broz53017032008-02-08 02:10:38 +000067
Milan Broz01482b72008-02-08 02:11:04 +000068struct dm_crypt_request {
Huang Yingb2174ee2009-03-16 17:44:33 +000069 struct convert_context *ctx;
Milan Broz01482b72008-02-08 02:11:04 +000070 struct scatterlist sg_in;
71 struct scatterlist sg_out;
Milan Broz2dc53272011-01-13 19:59:54 +000072 sector_t iv_sector;
Milan Broz01482b72008-02-08 02:11:04 +000073};
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075struct crypt_config;
76
77struct crypt_iv_operations {
78 int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
Milan Brozd469f842007-10-19 22:42:37 +010079 const char *opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 void (*dtr)(struct crypt_config *cc);
Milan Brozb95bf2d2009-12-10 23:51:56 +000081 int (*init)(struct crypt_config *cc);
Milan Broz542da312009-12-10 23:51:57 +000082 int (*wipe)(struct crypt_config *cc);
Milan Broz2dc53272011-01-13 19:59:54 +000083 int (*generator)(struct crypt_config *cc, u8 *iv,
84 struct dm_crypt_request *dmreq);
85 int (*post)(struct crypt_config *cc, u8 *iv,
86 struct dm_crypt_request *dmreq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087};
88
Milan Broz60473592009-12-10 23:51:55 +000089struct iv_essiv_private {
Herbert Xubbdb23b2016-01-24 21:16:36 +080090 struct crypto_ahash *hash_tfm;
Milan Brozb95bf2d2009-12-10 23:51:56 +000091 u8 *salt;
Milan Broz60473592009-12-10 23:51:55 +000092};
93
94struct iv_benbi_private {
95 int shift;
96};
97
Milan Broz34745782011-01-13 19:59:55 +000098#define LMK_SEED_SIZE 64 /* hash + 0 */
99struct iv_lmk_private {
100 struct crypto_shash *hash_tfm;
101 u8 *seed;
102};
103
Milan Brozed04d982013-10-28 23:21:04 +0100104#define TCW_WHITENING_SIZE 16
105struct iv_tcw_private {
106 struct crypto_shash *crc32_tfm;
107 u8 *iv_seed;
108 u8 *whitening;
109};
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111/*
112 * Crypt: maps a linear range of a block device
113 * and encrypts / decrypts at the same time.
114 */
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -0500115enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
Mikulas Patockabcbd94f2015-11-19 07:36:50 -0500116 DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD,
117 DM_CRYPT_EXIT_THREAD};
Andi Kleenc0297722011-01-13 19:59:53 +0000118
119/*
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500120 * The fields in here must be read only after initialization.
Andi Kleenc0297722011-01-13 19:59:53 +0000121 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122struct crypt_config {
123 struct dm_dev *dev;
124 sector_t start;
125
126 /*
Milan Brozddd42ed2008-02-08 02:11:07 +0000127 * pool for per bio private data, crypto requests and
128 * encryption requeusts/buffer pages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 */
Milan Brozddd42ed2008-02-08 02:11:07 +0000130 mempool_t *req_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 mempool_t *page_pool;
Milan Broz6a24c712006-10-03 01:15:40 -0700132 struct bio_set *bs;
Mikulas Patocka7145c242015-02-13 08:24:41 -0500133 struct mutex bio_alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Milan Brozcabf08e2007-10-19 22:38:58 +0100135 struct workqueue_struct *io_queue;
136 struct workqueue_struct *crypt_queue;
Milan Broz3f1e9072008-03-28 14:16:07 -0700137
Mikulas Patockadc267622015-02-13 08:25:59 -0500138 struct task_struct *write_thread;
139 wait_queue_head_t write_thread_wait;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -0500140 struct rb_root write_tree;
Mikulas Patockadc267622015-02-13 08:25:59 -0500141
Milan Broz5ebaee62010-08-12 04:14:07 +0100142 char *cipher;
Milan Broz7dbcd132011-01-13 19:59:52 +0000143 char *cipher_string;
Milan Broz5ebaee62010-08-12 04:14:07 +0100144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 struct crypt_iv_operations *iv_gen_ops;
Herbert Xu79066ad2006-12-05 13:41:52 -0800146 union {
Milan Broz60473592009-12-10 23:51:55 +0000147 struct iv_essiv_private essiv;
148 struct iv_benbi_private benbi;
Milan Broz34745782011-01-13 19:59:55 +0000149 struct iv_lmk_private lmk;
Milan Brozed04d982013-10-28 23:21:04 +0100150 struct iv_tcw_private tcw;
Herbert Xu79066ad2006-12-05 13:41:52 -0800151 } iv_gen_private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 sector_t iv_offset;
153 unsigned int iv_size;
154
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100155 /* ESSIV: struct crypto_cipher *essiv_tfm */
156 void *iv_private;
Herbert Xubbdb23b2016-01-24 21:16:36 +0800157 struct crypto_skcipher **tfms;
Milan Brozd1f96422011-01-13 19:59:54 +0000158 unsigned tfms_count;
Andi Kleenc0297722011-01-13 19:59:53 +0000159
160 /*
Milan Brozddd42ed2008-02-08 02:11:07 +0000161 * Layout of each crypto request:
162 *
Herbert Xubbdb23b2016-01-24 21:16:36 +0800163 * struct skcipher_request
Milan Brozddd42ed2008-02-08 02:11:07 +0000164 * context
165 * padding
166 * struct dm_crypt_request
167 * padding
168 * IV
169 *
170 * The padding is added so that dm_crypt_request and the IV are
171 * correctly aligned.
172 */
173 unsigned int dmreq_start;
Milan Brozddd42ed2008-02-08 02:11:07 +0000174
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400175 unsigned int per_bio_data_size;
176
Milan Broze48d4bb2006-10-03 01:15:37 -0700177 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 unsigned int key_size;
Milan Brozda31a072013-10-28 23:21:03 +0100179 unsigned int key_parts; /* independent parts in key buffer */
180 unsigned int key_extra_size; /* additional keys length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 u8 key[0];
182};
183
Milan Broz6a24c712006-10-03 01:15:40 -0700184#define MIN_IOS 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Alasdair G Kergon028867a2007-07-12 17:26:32 +0100186static void clone_init(struct dm_crypt_io *, struct bio *);
Alasdair G Kergon395b1672008-02-08 02:10:52 +0000187static void kcryptd_queue_crypt(struct dm_crypt_io *io);
Milan Broz2dc53272011-01-13 19:59:54 +0000188static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq);
Olaf Kirch027581f2007-05-09 02:32:52 -0700189
Andi Kleenc0297722011-01-13 19:59:53 +0000190/*
191 * Use this to access cipher attributes that are the same for each CPU.
192 */
Herbert Xubbdb23b2016-01-24 21:16:36 +0800193static struct crypto_skcipher *any_tfm(struct crypt_config *cc)
Andi Kleenc0297722011-01-13 19:59:53 +0000194{
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100195 return cc->tfms[0];
Andi Kleenc0297722011-01-13 19:59:53 +0000196}
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * Different IV generation algorithms:
200 *
Rik Snel3c164bd2006-09-02 18:17:33 +1000201 * plain: the initial vector is the 32-bit little-endian version of the sector
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200202 * number, padded with zeros if necessary.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 *
Milan Broz61afef62009-12-10 23:52:25 +0000204 * plain64: the initial vector is the 64-bit little-endian version of the sector
205 * number, padded with zeros if necessary.
206 *
Rik Snel3c164bd2006-09-02 18:17:33 +1000207 * essiv: "encrypted sector|salt initial vector", the sector number is
208 * encrypted with the bulk cipher using a salt as key. The salt
209 * should be derived from the bulk cipher's key via hashing.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 *
Rik Snel48527fa2006-09-03 08:56:39 +1000211 * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
212 * (needed for LRW-32-AES and possible other narrow block modes)
213 *
Ludwig Nussel46b47732007-05-09 02:32:55 -0700214 * null: the initial vector is always zero. Provides compatibility with
215 * obsolete loop_fish2 devices. Do not use for new devices.
216 *
Milan Broz34745782011-01-13 19:59:55 +0000217 * lmk: Compatible implementation of the block chaining mode used
218 * by the Loop-AES block device encryption system
219 * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
220 * It operates on full 512 byte sectors and uses CBC
221 * with an IV derived from the sector number, the data and
222 * optionally extra IV seed.
223 * This means that after decryption the first block
224 * of sector must be tweaked according to decrypted data.
225 * Loop-AES can use three encryption schemes:
226 * version 1: is plain aes-cbc mode
227 * version 2: uses 64 multikey scheme with lmk IV generator
228 * version 3: the same as version 2 with additional IV seed
229 * (it uses 65 keys, last key is used as IV seed)
230 *
Milan Brozed04d982013-10-28 23:21:04 +0100231 * tcw: Compatible implementation of the block chaining mode used
232 * by the TrueCrypt device encryption system (prior to version 4.1).
Milan Broze44f23b2015-04-05 18:03:10 +0200233 * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat
Milan Brozed04d982013-10-28 23:21:04 +0100234 * It operates on full 512 byte sectors and uses CBC
235 * with an IV derived from initial key and the sector number.
236 * In addition, whitening value is applied on every sector, whitening
237 * is calculated from initial key, sector number and mixed using CRC32.
238 * Note that this encryption scheme is vulnerable to watermarking attacks
239 * and should be used for old compatible containers access only.
240 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 * plumb: unimplemented, see:
242 * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
243 */
244
Milan Broz2dc53272011-01-13 19:59:54 +0000245static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
246 struct dm_crypt_request *dmreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
248 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100249 *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 return 0;
252}
253
Milan Broz61afef62009-12-10 23:52:25 +0000254static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
Milan Broz2dc53272011-01-13 19:59:54 +0000255 struct dm_crypt_request *dmreq)
Milan Broz61afef62009-12-10 23:52:25 +0000256{
257 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100258 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
Milan Broz61afef62009-12-10 23:52:25 +0000259
260 return 0;
261}
262
Milan Brozb95bf2d2009-12-10 23:51:56 +0000263/* Initialise ESSIV - compute salt but no local memory allocations */
264static int crypt_iv_essiv_init(struct crypt_config *cc)
265{
266 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
Herbert Xubbdb23b2016-01-24 21:16:36 +0800267 AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000268 struct scatterlist sg;
Andi Kleenc0297722011-01-13 19:59:53 +0000269 struct crypto_cipher *essiv_tfm;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100270 int err;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000271
272 sg_init_one(&sg, cc->key, cc->key_size);
Herbert Xubbdb23b2016-01-24 21:16:36 +0800273 ahash_request_set_tfm(req, essiv->hash_tfm);
274 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
275 ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000276
Herbert Xubbdb23b2016-01-24 21:16:36 +0800277 err = crypto_ahash_digest(req);
278 ahash_request_zero(req);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000279 if (err)
280 return err;
281
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100282 essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000283
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100284 err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
Herbert Xubbdb23b2016-01-24 21:16:36 +0800285 crypto_ahash_digestsize(essiv->hash_tfm));
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100286 if (err)
287 return err;
Andi Kleenc0297722011-01-13 19:59:53 +0000288
289 return 0;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000290}
291
Milan Broz542da312009-12-10 23:51:57 +0000292/* Wipe salt and reset key derived from volume key */
293static int crypt_iv_essiv_wipe(struct crypt_config *cc)
294{
295 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
Herbert Xubbdb23b2016-01-24 21:16:36 +0800296 unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000297 struct crypto_cipher *essiv_tfm;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100298 int r, err = 0;
Milan Broz542da312009-12-10 23:51:57 +0000299
300 memset(essiv->salt, 0, salt_size);
301
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100302 essiv_tfm = cc->iv_private;
303 r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
304 if (r)
305 err = r;
Andi Kleenc0297722011-01-13 19:59:53 +0000306
307 return err;
308}
309
310/* Set up per cpu cipher state */
311static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
312 struct dm_target *ti,
313 u8 *salt, unsigned saltsize)
314{
315 struct crypto_cipher *essiv_tfm;
316 int err;
317
318 /* Setup the essiv_tfm with the given salt */
319 essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
320 if (IS_ERR(essiv_tfm)) {
321 ti->error = "Error allocating crypto tfm for ESSIV";
322 return essiv_tfm;
323 }
324
325 if (crypto_cipher_blocksize(essiv_tfm) !=
Herbert Xubbdb23b2016-01-24 21:16:36 +0800326 crypto_skcipher_ivsize(any_tfm(cc))) {
Andi Kleenc0297722011-01-13 19:59:53 +0000327 ti->error = "Block size of ESSIV cipher does "
328 "not match IV size of block cipher";
329 crypto_free_cipher(essiv_tfm);
330 return ERR_PTR(-EINVAL);
331 }
332
333 err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
334 if (err) {
335 ti->error = "Failed to set key for ESSIV cipher";
336 crypto_free_cipher(essiv_tfm);
337 return ERR_PTR(err);
338 }
339
340 return essiv_tfm;
Milan Broz542da312009-12-10 23:51:57 +0000341}
342
Milan Broz60473592009-12-10 23:51:55 +0000343static void crypt_iv_essiv_dtr(struct crypt_config *cc)
344{
Andi Kleenc0297722011-01-13 19:59:53 +0000345 struct crypto_cipher *essiv_tfm;
Milan Broz60473592009-12-10 23:51:55 +0000346 struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
347
Herbert Xubbdb23b2016-01-24 21:16:36 +0800348 crypto_free_ahash(essiv->hash_tfm);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000349 essiv->hash_tfm = NULL;
350
351 kzfree(essiv->salt);
352 essiv->salt = NULL;
Andi Kleenc0297722011-01-13 19:59:53 +0000353
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100354 essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000355
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100356 if (essiv_tfm)
357 crypto_free_cipher(essiv_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000358
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100359 cc->iv_private = NULL;
Milan Broz60473592009-12-10 23:51:55 +0000360}
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
Milan Brozd469f842007-10-19 22:42:37 +0100363 const char *opts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
Milan Broz5861f1b2009-12-10 23:51:56 +0000365 struct crypto_cipher *essiv_tfm = NULL;
Herbert Xubbdb23b2016-01-24 21:16:36 +0800366 struct crypto_ahash *hash_tfm = NULL;
Milan Broz5861f1b2009-12-10 23:51:56 +0000367 u8 *salt = NULL;
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100368 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Milan Broz5861f1b2009-12-10 23:51:56 +0000370 if (!opts) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700371 ti->error = "Digest algorithm missing for ESSIV mode";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 return -EINVAL;
373 }
374
Milan Brozb95bf2d2009-12-10 23:51:56 +0000375 /* Allocate hash algorithm */
Herbert Xubbdb23b2016-01-24 21:16:36 +0800376 hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC);
Herbert Xu35058682006-08-24 19:10:20 +1000377 if (IS_ERR(hash_tfm)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700378 ti->error = "Error initializing ESSIV hash";
Milan Broz5861f1b2009-12-10 23:51:56 +0000379 err = PTR_ERR(hash_tfm);
380 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382
Herbert Xubbdb23b2016-01-24 21:16:36 +0800383 salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL);
Milan Broz5861f1b2009-12-10 23:51:56 +0000384 if (!salt) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700385 ti->error = "Error kmallocing salt storage in ESSIV";
Milan Broz5861f1b2009-12-10 23:51:56 +0000386 err = -ENOMEM;
387 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389
Milan Brozb95bf2d2009-12-10 23:51:56 +0000390 cc->iv_gen_private.essiv.salt = salt;
Milan Brozb95bf2d2009-12-10 23:51:56 +0000391 cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
392
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100393 essiv_tfm = setup_essiv_cpu(cc, ti, salt,
Herbert Xubbdb23b2016-01-24 21:16:36 +0800394 crypto_ahash_digestsize(hash_tfm));
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100395 if (IS_ERR(essiv_tfm)) {
396 crypt_iv_essiv_dtr(cc);
397 return PTR_ERR(essiv_tfm);
Andi Kleenc0297722011-01-13 19:59:53 +0000398 }
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100399 cc->iv_private = essiv_tfm;
Andi Kleenc0297722011-01-13 19:59:53 +0000400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return 0;
Milan Broz5861f1b2009-12-10 23:51:56 +0000402
403bad:
Milan Broz5861f1b2009-12-10 23:51:56 +0000404 if (hash_tfm && !IS_ERR(hash_tfm))
Herbert Xubbdb23b2016-01-24 21:16:36 +0800405 crypto_free_ahash(hash_tfm);
Milan Brozb95bf2d2009-12-10 23:51:56 +0000406 kfree(salt);
Milan Broz5861f1b2009-12-10 23:51:56 +0000407 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Milan Broz2dc53272011-01-13 19:59:54 +0000410static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
411 struct dm_crypt_request *dmreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Mikulas Patockafd2d2312012-07-27 15:08:05 +0100413 struct crypto_cipher *essiv_tfm = cc->iv_private;
Andi Kleenc0297722011-01-13 19:59:53 +0000414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 memset(iv, 0, cc->iv_size);
Alasdair G Kergon283a8322011-08-02 12:32:01 +0100416 *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
Andi Kleenc0297722011-01-13 19:59:53 +0000417 crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return 0;
420}
421
Rik Snel48527fa2006-09-03 08:56:39 +1000422static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
423 const char *opts)
424{
Herbert Xubbdb23b2016-01-24 21:16:36 +0800425 unsigned bs = crypto_skcipher_blocksize(any_tfm(cc));
David Howellsf0d1b0b2006-12-08 02:37:49 -0800426 int log = ilog2(bs);
Rik Snel48527fa2006-09-03 08:56:39 +1000427
428 /* we need to calculate how far we must shift the sector count
429 * to get the cipher block count, we use this shift in _gen */
430
431 if (1 << log != bs) {
432 ti->error = "cypher blocksize is not a power of 2";
433 return -EINVAL;
434 }
435
436 if (log > 9) {
437 ti->error = "cypher blocksize is > 512";
438 return -EINVAL;
439 }
440
Milan Broz60473592009-12-10 23:51:55 +0000441 cc->iv_gen_private.benbi.shift = 9 - log;
Rik Snel48527fa2006-09-03 08:56:39 +1000442
443 return 0;
444}
445
446static void crypt_iv_benbi_dtr(struct crypt_config *cc)
447{
Rik Snel48527fa2006-09-03 08:56:39 +1000448}
449
Milan Broz2dc53272011-01-13 19:59:54 +0000450static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
451 struct dm_crypt_request *dmreq)
Rik Snel48527fa2006-09-03 08:56:39 +1000452{
Herbert Xu79066ad2006-12-05 13:41:52 -0800453 __be64 val;
454
Rik Snel48527fa2006-09-03 08:56:39 +1000455 memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
Herbert Xu79066ad2006-12-05 13:41:52 -0800456
Milan Broz2dc53272011-01-13 19:59:54 +0000457 val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
Herbert Xu79066ad2006-12-05 13:41:52 -0800458 put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
Rik Snel48527fa2006-09-03 08:56:39 +1000459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 return 0;
461}
462
Milan Broz2dc53272011-01-13 19:59:54 +0000463static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
464 struct dm_crypt_request *dmreq)
Ludwig Nussel46b47732007-05-09 02:32:55 -0700465{
466 memset(iv, 0, cc->iv_size);
467
468 return 0;
469}
470
Milan Broz34745782011-01-13 19:59:55 +0000471static void crypt_iv_lmk_dtr(struct crypt_config *cc)
472{
473 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
474
475 if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
476 crypto_free_shash(lmk->hash_tfm);
477 lmk->hash_tfm = NULL;
478
479 kzfree(lmk->seed);
480 lmk->seed = NULL;
481}
482
483static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
484 const char *opts)
485{
486 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
487
488 lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
489 if (IS_ERR(lmk->hash_tfm)) {
490 ti->error = "Error initializing LMK hash";
491 return PTR_ERR(lmk->hash_tfm);
492 }
493
494 /* No seed in LMK version 2 */
495 if (cc->key_parts == cc->tfms_count) {
496 lmk->seed = NULL;
497 return 0;
498 }
499
500 lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
501 if (!lmk->seed) {
502 crypt_iv_lmk_dtr(cc);
503 ti->error = "Error kmallocing seed storage in LMK";
504 return -ENOMEM;
505 }
506
507 return 0;
508}
509
510static int crypt_iv_lmk_init(struct crypt_config *cc)
511{
512 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
513 int subkey_size = cc->key_size / cc->key_parts;
514
515 /* LMK seed is on the position of LMK_KEYS + 1 key */
516 if (lmk->seed)
517 memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
518 crypto_shash_digestsize(lmk->hash_tfm));
519
520 return 0;
521}
522
523static int crypt_iv_lmk_wipe(struct crypt_config *cc)
524{
525 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
526
527 if (lmk->seed)
528 memset(lmk->seed, 0, LMK_SEED_SIZE);
529
530 return 0;
531}
532
533static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
534 struct dm_crypt_request *dmreq,
535 u8 *data)
536{
537 struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200538 SHASH_DESC_ON_STACK(desc, lmk->hash_tfm);
Milan Broz34745782011-01-13 19:59:55 +0000539 struct md5_state md5state;
Milan Brozda31a072013-10-28 23:21:03 +0100540 __le32 buf[4];
Milan Broz34745782011-01-13 19:59:55 +0000541 int i, r;
542
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200543 desc->tfm = lmk->hash_tfm;
544 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
Milan Broz34745782011-01-13 19:59:55 +0000545
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200546 r = crypto_shash_init(desc);
Milan Broz34745782011-01-13 19:59:55 +0000547 if (r)
548 return r;
549
550 if (lmk->seed) {
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200551 r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE);
Milan Broz34745782011-01-13 19:59:55 +0000552 if (r)
553 return r;
554 }
555
556 /* Sector is always 512B, block size 16, add data of blocks 1-31 */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200557 r = crypto_shash_update(desc, data + 16, 16 * 31);
Milan Broz34745782011-01-13 19:59:55 +0000558 if (r)
559 return r;
560
561 /* Sector is cropped to 56 bits here */
562 buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
563 buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
564 buf[2] = cpu_to_le32(4024);
565 buf[3] = 0;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200566 r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf));
Milan Broz34745782011-01-13 19:59:55 +0000567 if (r)
568 return r;
569
570 /* No MD5 padding here */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200571 r = crypto_shash_export(desc, &md5state);
Milan Broz34745782011-01-13 19:59:55 +0000572 if (r)
573 return r;
574
575 for (i = 0; i < MD5_HASH_WORDS; i++)
576 __cpu_to_le32s(&md5state.hash[i]);
577 memcpy(iv, &md5state.hash, cc->iv_size);
578
579 return 0;
580}
581
582static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
583 struct dm_crypt_request *dmreq)
584{
585 u8 *src;
586 int r = 0;
587
588 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
Cong Wangc2e022c2011-11-28 13:26:02 +0800589 src = kmap_atomic(sg_page(&dmreq->sg_in));
Milan Broz34745782011-01-13 19:59:55 +0000590 r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset);
Cong Wangc2e022c2011-11-28 13:26:02 +0800591 kunmap_atomic(src);
Milan Broz34745782011-01-13 19:59:55 +0000592 } else
593 memset(iv, 0, cc->iv_size);
594
595 return r;
596}
597
598static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
599 struct dm_crypt_request *dmreq)
600{
601 u8 *dst;
602 int r;
603
604 if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
605 return 0;
606
Cong Wangc2e022c2011-11-28 13:26:02 +0800607 dst = kmap_atomic(sg_page(&dmreq->sg_out));
Milan Broz34745782011-01-13 19:59:55 +0000608 r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset);
609
610 /* Tweak the first block of plaintext sector */
611 if (!r)
612 crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size);
613
Cong Wangc2e022c2011-11-28 13:26:02 +0800614 kunmap_atomic(dst);
Milan Broz34745782011-01-13 19:59:55 +0000615 return r;
616}
617
Milan Brozed04d982013-10-28 23:21:04 +0100618static void crypt_iv_tcw_dtr(struct crypt_config *cc)
619{
620 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
621
622 kzfree(tcw->iv_seed);
623 tcw->iv_seed = NULL;
624 kzfree(tcw->whitening);
625 tcw->whitening = NULL;
626
627 if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm))
628 crypto_free_shash(tcw->crc32_tfm);
629 tcw->crc32_tfm = NULL;
630}
631
632static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti,
633 const char *opts)
634{
635 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
636
637 if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) {
638 ti->error = "Wrong key size for TCW";
639 return -EINVAL;
640 }
641
642 tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0);
643 if (IS_ERR(tcw->crc32_tfm)) {
644 ti->error = "Error initializing CRC32 in TCW";
645 return PTR_ERR(tcw->crc32_tfm);
646 }
647
648 tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL);
649 tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL);
650 if (!tcw->iv_seed || !tcw->whitening) {
651 crypt_iv_tcw_dtr(cc);
652 ti->error = "Error allocating seed storage in TCW";
653 return -ENOMEM;
654 }
655
656 return 0;
657}
658
659static int crypt_iv_tcw_init(struct crypt_config *cc)
660{
661 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
662 int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE;
663
664 memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size);
665 memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size],
666 TCW_WHITENING_SIZE);
667
668 return 0;
669}
670
671static int crypt_iv_tcw_wipe(struct crypt_config *cc)
672{
673 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
674
675 memset(tcw->iv_seed, 0, cc->iv_size);
676 memset(tcw->whitening, 0, TCW_WHITENING_SIZE);
677
678 return 0;
679}
680
681static int crypt_iv_tcw_whitening(struct crypt_config *cc,
682 struct dm_crypt_request *dmreq,
683 u8 *data)
684{
685 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
686 u64 sector = cpu_to_le64((u64)dmreq->iv_sector);
687 u8 buf[TCW_WHITENING_SIZE];
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200688 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
Milan Brozed04d982013-10-28 23:21:04 +0100689 int i, r;
690
691 /* xor whitening with sector number */
692 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
693 crypto_xor(buf, (u8 *)&sector, 8);
694 crypto_xor(&buf[8], (u8 *)&sector, 8);
695
696 /* calculate crc32 for every 32bit part and xor it */
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200697 desc->tfm = tcw->crc32_tfm;
698 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
Milan Brozed04d982013-10-28 23:21:04 +0100699 for (i = 0; i < 4; i++) {
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200700 r = crypto_shash_init(desc);
Milan Brozed04d982013-10-28 23:21:04 +0100701 if (r)
702 goto out;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200703 r = crypto_shash_update(desc, &buf[i * 4], 4);
Milan Brozed04d982013-10-28 23:21:04 +0100704 if (r)
705 goto out;
Jan-Simon Möllerb6106262012-07-02 13:50:54 +0200706 r = crypto_shash_final(desc, &buf[i * 4]);
Milan Brozed04d982013-10-28 23:21:04 +0100707 if (r)
708 goto out;
709 }
710 crypto_xor(&buf[0], &buf[12], 4);
711 crypto_xor(&buf[4], &buf[8], 4);
712
713 /* apply whitening (8 bytes) to whole sector */
714 for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
715 crypto_xor(data + i * 8, buf, 8);
716out:
Milan Broz1a71d6f2014-11-22 09:36:04 +0100717 memzero_explicit(buf, sizeof(buf));
Milan Brozed04d982013-10-28 23:21:04 +0100718 return r;
719}
720
721static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
722 struct dm_crypt_request *dmreq)
723{
724 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
725 u64 sector = cpu_to_le64((u64)dmreq->iv_sector);
726 u8 *src;
727 int r = 0;
728
729 /* Remove whitening from ciphertext */
730 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
731 src = kmap_atomic(sg_page(&dmreq->sg_in));
732 r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset);
733 kunmap_atomic(src);
734 }
735
736 /* Calculate IV */
737 memcpy(iv, tcw->iv_seed, cc->iv_size);
738 crypto_xor(iv, (u8 *)&sector, 8);
739 if (cc->iv_size > 8)
740 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
741
742 return r;
743}
744
745static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
746 struct dm_crypt_request *dmreq)
747{
748 u8 *dst;
749 int r;
750
751 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE)
752 return 0;
753
754 /* Apply whitening on ciphertext */
755 dst = kmap_atomic(sg_page(&dmreq->sg_out));
756 r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset);
757 kunmap_atomic(dst);
758
759 return r;
760}
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762static struct crypt_iv_operations crypt_iv_plain_ops = {
763 .generator = crypt_iv_plain_gen
764};
765
Milan Broz61afef62009-12-10 23:52:25 +0000766static struct crypt_iv_operations crypt_iv_plain64_ops = {
767 .generator = crypt_iv_plain64_gen
768};
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770static struct crypt_iv_operations crypt_iv_essiv_ops = {
771 .ctr = crypt_iv_essiv_ctr,
772 .dtr = crypt_iv_essiv_dtr,
Milan Brozb95bf2d2009-12-10 23:51:56 +0000773 .init = crypt_iv_essiv_init,
Milan Broz542da312009-12-10 23:51:57 +0000774 .wipe = crypt_iv_essiv_wipe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 .generator = crypt_iv_essiv_gen
776};
777
Rik Snel48527fa2006-09-03 08:56:39 +1000778static struct crypt_iv_operations crypt_iv_benbi_ops = {
779 .ctr = crypt_iv_benbi_ctr,
780 .dtr = crypt_iv_benbi_dtr,
781 .generator = crypt_iv_benbi_gen
782};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Ludwig Nussel46b47732007-05-09 02:32:55 -0700784static struct crypt_iv_operations crypt_iv_null_ops = {
785 .generator = crypt_iv_null_gen
786};
787
Milan Broz34745782011-01-13 19:59:55 +0000788static struct crypt_iv_operations crypt_iv_lmk_ops = {
789 .ctr = crypt_iv_lmk_ctr,
790 .dtr = crypt_iv_lmk_dtr,
791 .init = crypt_iv_lmk_init,
792 .wipe = crypt_iv_lmk_wipe,
793 .generator = crypt_iv_lmk_gen,
794 .post = crypt_iv_lmk_post
795};
796
Milan Brozed04d982013-10-28 23:21:04 +0100797static struct crypt_iv_operations crypt_iv_tcw_ops = {
798 .ctr = crypt_iv_tcw_ctr,
799 .dtr = crypt_iv_tcw_dtr,
800 .init = crypt_iv_tcw_init,
801 .wipe = crypt_iv_tcw_wipe,
802 .generator = crypt_iv_tcw_gen,
803 .post = crypt_iv_tcw_post
804};
805
Milan Brozd469f842007-10-19 22:42:37 +0100806static void crypt_convert_init(struct crypt_config *cc,
807 struct convert_context *ctx,
808 struct bio *bio_out, struct bio *bio_in,
Milan Brozfcd369d2008-02-08 02:10:41 +0000809 sector_t sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
811 ctx->bio_in = bio_in;
812 ctx->bio_out = bio_out;
Kent Overstreet003b5c52013-10-11 15:45:43 -0700813 if (bio_in)
814 ctx->iter_in = bio_in->bi_iter;
815 if (bio_out)
816 ctx->iter_out = bio_out->bi_iter;
Mikulas Patockac66029f2012-07-27 15:08:05 +0100817 ctx->cc_sector = sector + cc->iv_offset;
Milan Broz43d69032008-02-08 02:11:09 +0000818 init_completion(&ctx->restart);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819}
820
Huang Yingb2174ee2009-03-16 17:44:33 +0000821static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
Herbert Xubbdb23b2016-01-24 21:16:36 +0800822 struct skcipher_request *req)
Huang Yingb2174ee2009-03-16 17:44:33 +0000823{
824 return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
825}
826
Herbert Xubbdb23b2016-01-24 21:16:36 +0800827static struct skcipher_request *req_of_dmreq(struct crypt_config *cc,
Huang Yingb2174ee2009-03-16 17:44:33 +0000828 struct dm_crypt_request *dmreq)
829{
Herbert Xubbdb23b2016-01-24 21:16:36 +0800830 return (struct skcipher_request *)((char *)dmreq - cc->dmreq_start);
Huang Yingb2174ee2009-03-16 17:44:33 +0000831}
832
Milan Broz2dc53272011-01-13 19:59:54 +0000833static u8 *iv_of_dmreq(struct crypt_config *cc,
834 struct dm_crypt_request *dmreq)
835{
836 return (u8 *)ALIGN((unsigned long)(dmreq + 1),
Herbert Xubbdb23b2016-01-24 21:16:36 +0800837 crypto_skcipher_alignmask(any_tfm(cc)) + 1);
Milan Broz2dc53272011-01-13 19:59:54 +0000838}
839
Milan Broz01482b72008-02-08 02:11:04 +0000840static int crypt_convert_block(struct crypt_config *cc,
Milan Broz3a7f6c92008-02-08 02:11:14 +0000841 struct convert_context *ctx,
Herbert Xubbdb23b2016-01-24 21:16:36 +0800842 struct skcipher_request *req)
Milan Broz01482b72008-02-08 02:11:04 +0000843{
Kent Overstreet003b5c52013-10-11 15:45:43 -0700844 struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in);
845 struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000846 struct dm_crypt_request *dmreq;
847 u8 *iv;
Mikulas Patocka40b62292012-07-27 15:08:04 +0100848 int r;
Milan Broz01482b72008-02-08 02:11:04 +0000849
Huang Yingb2174ee2009-03-16 17:44:33 +0000850 dmreq = dmreq_of_req(cc, req);
Milan Broz2dc53272011-01-13 19:59:54 +0000851 iv = iv_of_dmreq(cc, dmreq);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000852
Mikulas Patockac66029f2012-07-27 15:08:05 +0100853 dmreq->iv_sector = ctx->cc_sector;
Huang Yingb2174ee2009-03-16 17:44:33 +0000854 dmreq->ctx = ctx;
Milan Broz3a7f6c92008-02-08 02:11:14 +0000855 sg_init_table(&dmreq->sg_in, 1);
Kent Overstreet003b5c52013-10-11 15:45:43 -0700856 sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT,
857 bv_in.bv_offset);
Milan Broz01482b72008-02-08 02:11:04 +0000858
Milan Broz3a7f6c92008-02-08 02:11:14 +0000859 sg_init_table(&dmreq->sg_out, 1);
Kent Overstreet003b5c52013-10-11 15:45:43 -0700860 sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT,
861 bv_out.bv_offset);
Milan Broz01482b72008-02-08 02:11:04 +0000862
Kent Overstreet003b5c52013-10-11 15:45:43 -0700863 bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT);
864 bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT);
Milan Broz01482b72008-02-08 02:11:04 +0000865
Milan Broz3a7f6c92008-02-08 02:11:14 +0000866 if (cc->iv_gen_ops) {
Milan Broz2dc53272011-01-13 19:59:54 +0000867 r = cc->iv_gen_ops->generator(cc, iv, dmreq);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000868 if (r < 0)
869 return r;
870 }
871
Herbert Xubbdb23b2016-01-24 21:16:36 +0800872 skcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
873 1 << SECTOR_SHIFT, iv);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000874
875 if (bio_data_dir(ctx->bio_in) == WRITE)
Herbert Xubbdb23b2016-01-24 21:16:36 +0800876 r = crypto_skcipher_encrypt(req);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000877 else
Herbert Xubbdb23b2016-01-24 21:16:36 +0800878 r = crypto_skcipher_decrypt(req);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000879
Milan Broz2dc53272011-01-13 19:59:54 +0000880 if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
881 r = cc->iv_gen_ops->post(cc, iv, dmreq);
882
Milan Broz3a7f6c92008-02-08 02:11:14 +0000883 return r;
Milan Broz01482b72008-02-08 02:11:04 +0000884}
885
Milan Broz95497a92008-02-08 02:11:12 +0000886static void kcryptd_async_done(struct crypto_async_request *async_req,
887 int error);
Andi Kleenc0297722011-01-13 19:59:53 +0000888
Milan Brozddd42ed2008-02-08 02:11:07 +0000889static void crypt_alloc_req(struct crypt_config *cc,
890 struct convert_context *ctx)
891{
Mikulas Patockac66029f2012-07-27 15:08:05 +0100892 unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1);
Andi Kleenc0297722011-01-13 19:59:53 +0000893
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500894 if (!ctx->req)
895 ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO);
Andi Kleenc0297722011-01-13 19:59:53 +0000896
Herbert Xubbdb23b2016-01-24 21:16:36 +0800897 skcipher_request_set_tfm(ctx->req, cc->tfms[key_index]);
Milan Broz54cea3f2015-05-15 17:00:25 +0200898
899 /*
900 * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs
901 * requests if driver request queue is full.
902 */
Herbert Xubbdb23b2016-01-24 21:16:36 +0800903 skcipher_request_set_callback(ctx->req,
Andi Kleenc0297722011-01-13 19:59:53 +0000904 CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500905 kcryptd_async_done, dmreq_of_req(cc, ctx->req));
Milan Brozddd42ed2008-02-08 02:11:07 +0000906}
907
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400908static void crypt_free_req(struct crypt_config *cc,
Herbert Xubbdb23b2016-01-24 21:16:36 +0800909 struct skcipher_request *req, struct bio *base_bio)
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400910{
911 struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size);
912
Herbert Xubbdb23b2016-01-24 21:16:36 +0800913 if ((struct skcipher_request *)(io + 1) != req)
Mikulas Patocka298a9fa2014-03-28 15:51:55 -0400914 mempool_free(req, cc->req_pool);
915}
916
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917/*
918 * Encrypt / decrypt data from one bio to another one (can be the same one)
919 */
920static int crypt_convert(struct crypt_config *cc,
Milan Brozd469f842007-10-19 22:42:37 +0100921 struct convert_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
Milan Broz3f1e9072008-03-28 14:16:07 -0700923 int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Mikulas Patocka40b62292012-07-27 15:08:04 +0100925 atomic_set(&ctx->cc_pending, 1);
Milan Brozc8081612008-10-10 13:37:08 +0100926
Kent Overstreet003b5c52013-10-11 15:45:43 -0700927 while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Milan Broz3a7f6c92008-02-08 02:11:14 +0000929 crypt_alloc_req(cc, ctx);
930
Mikulas Patocka40b62292012-07-27 15:08:04 +0100931 atomic_inc(&ctx->cc_pending);
Milan Broz3f1e9072008-03-28 14:16:07 -0700932
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500933 r = crypt_convert_block(cc, ctx, ctx->req);
Milan Broz3a7f6c92008-02-08 02:11:14 +0000934
935 switch (r) {
Milan Broz54cea3f2015-05-15 17:00:25 +0200936 /*
937 * The request was queued by a crypto driver
938 * but the driver request queue is full, let's wait.
939 */
Milan Broz3a7f6c92008-02-08 02:11:14 +0000940 case -EBUSY:
941 wait_for_completion(&ctx->restart);
Wolfram Sang16735d02013-11-14 14:32:02 -0800942 reinit_completion(&ctx->restart);
Milan Broz54cea3f2015-05-15 17:00:25 +0200943 /* fall through */
944 /*
945 * The request is queued and processed asynchronously,
946 * completion function kcryptd_async_done() will be called.
947 */
Rabin Vincentc0403ec2015-05-05 15:15:56 +0200948 case -EINPROGRESS:
Mikulas Patocka610f2de2014-02-20 18:01:01 -0500949 ctx->req = NULL;
Mikulas Patockac66029f2012-07-27 15:08:05 +0100950 ctx->cc_sector++;
Milan Broz3a7f6c92008-02-08 02:11:14 +0000951 continue;
Milan Broz54cea3f2015-05-15 17:00:25 +0200952 /*
953 * The request was already processed (synchronously).
954 */
Milan Broz3f1e9072008-03-28 14:16:07 -0700955 case 0:
Mikulas Patocka40b62292012-07-27 15:08:04 +0100956 atomic_dec(&ctx->cc_pending);
Mikulas Patockac66029f2012-07-27 15:08:05 +0100957 ctx->cc_sector++;
Milan Brozc7f1b202008-07-02 09:34:28 +0100958 cond_resched();
Milan Broz3f1e9072008-03-28 14:16:07 -0700959 continue;
960
Milan Broz54cea3f2015-05-15 17:00:25 +0200961 /* There was an error while processing the request. */
Milan Broz3f1e9072008-03-28 14:16:07 -0700962 default:
Mikulas Patocka40b62292012-07-27 15:08:04 +0100963 atomic_dec(&ctx->cc_pending);
Milan Broz3f1e9072008-03-28 14:16:07 -0700964 return r;
965 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 }
967
Milan Broz3f1e9072008-03-28 14:16:07 -0700968 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969}
970
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500971static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
972
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973/*
974 * Generate a new unfragmented bio with the given size
Mike Snitzer586b2862015-09-09 21:34:51 -0400975 * This should never violate the device limitations (but only because
976 * max_segment_size is being constrained to PAGE_SIZE).
Mikulas Patocka7145c242015-02-13 08:24:41 -0500977 *
978 * This function may be called concurrently. If we allocate from the mempool
979 * concurrently, there is a possibility of deadlock. For example, if we have
980 * mempool of 256 pages, two processes, each wanting 256, pages allocate from
981 * the mempool concurrently, it may deadlock in a situation where both processes
982 * have allocated 128 pages and the mempool is exhausted.
983 *
984 * In order to avoid this scenario we allocate the pages under a mutex.
985 *
986 * In order to not degrade performance with excessive locking, we try
987 * non-blocking allocations without a mutex first but on failure we fallback
988 * to blocking allocations with a mutex.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 */
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500990static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +0100992 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -0700993 struct bio *clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
Mikulas Patocka7145c242015-02-13 08:24:41 -0500995 gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
996 unsigned i, len, remaining_size;
Milan Broz91e10622007-12-13 14:16:10 +0000997 struct page *page;
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -0500998 struct bio_vec *bvec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
Mikulas Patocka7145c242015-02-13 08:24:41 -05001000retry:
Mel Gormand0164ad2015-11-06 16:28:21 -08001001 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
Mikulas Patocka7145c242015-02-13 08:24:41 -05001002 mutex_lock(&cc->bio_alloc_lock);
1003
Olaf Kirch2f9941b2007-05-09 02:32:53 -07001004 clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
Milan Broz8b004452006-10-03 01:15:37 -07001005 if (!clone)
Mikulas Patocka7145c242015-02-13 08:24:41 -05001006 goto return_clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
Olaf Kirch027581f2007-05-09 02:32:52 -07001008 clone_init(io, clone);
Milan Broz6a24c712006-10-03 01:15:40 -07001009
Mikulas Patocka7145c242015-02-13 08:24:41 -05001010 remaining_size = size;
1011
Olaf Kirchf97380b2007-05-09 02:32:54 -07001012 for (i = 0; i < nr_iovecs; i++) {
Milan Broz91e10622007-12-13 14:16:10 +00001013 page = mempool_alloc(cc->page_pool, gfp_mask);
Mikulas Patocka7145c242015-02-13 08:24:41 -05001014 if (!page) {
1015 crypt_free_buffer_pages(cc, clone);
1016 bio_put(clone);
Mel Gormand0164ad2015-11-06 16:28:21 -08001017 gfp_mask |= __GFP_DIRECT_RECLAIM;
Mikulas Patocka7145c242015-02-13 08:24:41 -05001018 goto retry;
1019 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Mikulas Patocka7145c242015-02-13 08:24:41 -05001021 len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001023 bvec = &clone->bi_io_vec[clone->bi_vcnt++];
1024 bvec->bv_page = page;
1025 bvec->bv_len = len;
1026 bvec->bv_offset = 0;
1027
1028 clone->bi_iter.bi_size += len;
Milan Broz91e10622007-12-13 14:16:10 +00001029
Mikulas Patocka7145c242015-02-13 08:24:41 -05001030 remaining_size -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032
Mikulas Patocka7145c242015-02-13 08:24:41 -05001033return_clone:
Mel Gormand0164ad2015-11-06 16:28:21 -08001034 if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
Mikulas Patocka7145c242015-02-13 08:24:41 -05001035 mutex_unlock(&cc->bio_alloc_lock);
1036
Milan Broz8b004452006-10-03 01:15:37 -07001037 return clone;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038}
1039
Neil Brown644bd2f2007-10-16 13:48:46 +02001040static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041{
Neil Brown644bd2f2007-10-16 13:48:46 +02001042 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 struct bio_vec *bv;
1044
Kent Overstreetcb34e052012-09-05 15:22:02 -07001045 bio_for_each_segment_all(bv, clone, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 BUG_ON(!bv->bv_page);
1047 mempool_free(bv->bv_page, cc->page_pool);
1048 bv->bv_page = NULL;
1049 }
1050}
1051
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001052static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc,
1053 struct bio *bio, sector_t sector)
Milan Brozdc440d1e2008-10-10 13:37:03 +01001054{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001055 io->cc = cc;
Milan Brozdc440d1e2008-10-10 13:37:03 +01001056 io->base_bio = bio;
1057 io->sector = sector;
1058 io->error = 0;
Mikulas Patocka610f2de2014-02-20 18:01:01 -05001059 io->ctx.req = NULL;
Mikulas Patocka40b62292012-07-27 15:08:04 +01001060 atomic_set(&io->io_pending, 0);
Milan Brozdc440d1e2008-10-10 13:37:03 +01001061}
1062
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001063static void crypt_inc_pending(struct dm_crypt_io *io)
1064{
Mikulas Patocka40b62292012-07-27 15:08:04 +01001065 atomic_inc(&io->io_pending);
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001066}
1067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068/*
1069 * One of the bios was finished. Check for completion of
1070 * the whole request and correctly clean up the buffer.
1071 */
Milan Broz5742fd72008-02-08 02:10:43 +00001072static void crypt_dec_pending(struct dm_crypt_io *io)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001074 struct crypt_config *cc = io->cc;
Milan Brozb35f8ca2009-03-16 17:44:36 +00001075 struct bio *base_bio = io->base_bio;
Milan Brozb35f8ca2009-03-16 17:44:36 +00001076 int error = io->error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
Mikulas Patocka40b62292012-07-27 15:08:04 +01001078 if (!atomic_dec_and_test(&io->io_pending))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return;
1080
Mikulas Patocka610f2de2014-02-20 18:01:01 -05001081 if (io->ctx.req)
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001082 crypt_free_req(cc, io->ctx.req, base_bio);
Milan Brozb35f8ca2009-03-16 17:44:36 +00001083
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001084 base_bio->bi_error = error;
1085 bio_endio(base_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086}
1087
1088/*
Milan Brozcabf08e2007-10-19 22:38:58 +01001089 * kcryptd/kcryptd_io:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 *
1091 * Needed because it would be very unwise to do decryption in an
Milan Broz23541d22006-10-03 01:15:39 -07001092 * interrupt context.
Milan Brozcabf08e2007-10-19 22:38:58 +01001093 *
1094 * kcryptd performs the actual encryption or decryption.
1095 *
1096 * kcryptd_io performs the IO submission.
1097 *
1098 * They must be separated as otherwise the final stages could be
1099 * starved by new requests which can block in the first stages due
1100 * to memory allocation.
Andi Kleenc0297722011-01-13 19:59:53 +00001101 *
1102 * The work is done per CPU global for all dm-crypt instances.
1103 * They should not depend on each other and do not block.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 */
Christoph Hellwig4246a0b2015-07-20 15:29:37 +02001105static void crypt_endio(struct bio *clone)
Milan Broz8b004452006-10-03 01:15:37 -07001106{
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001107 struct dm_crypt_io *io = clone->bi_private;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001108 struct crypt_config *cc = io->cc;
Milan Brozee7a4912008-02-08 02:10:46 +00001109 unsigned rw = bio_data_dir(clone);
Sasha Levin9b81c842015-08-10 19:05:18 -04001110 int error;
Milan Broz8b004452006-10-03 01:15:37 -07001111
1112 /*
NeilBrown6712ecf2007-09-27 12:47:43 +02001113 * free the processed pages
Milan Broz8b004452006-10-03 01:15:37 -07001114 */
Milan Brozee7a4912008-02-08 02:10:46 +00001115 if (rw == WRITE)
Neil Brown644bd2f2007-10-16 13:48:46 +02001116 crypt_free_buffer_pages(cc, clone);
Milan Brozee7a4912008-02-08 02:10:46 +00001117
Sasha Levin9b81c842015-08-10 19:05:18 -04001118 error = clone->bi_error;
Milan Brozee7a4912008-02-08 02:10:46 +00001119 bio_put(clone);
1120
Sasha Levin9b81c842015-08-10 19:05:18 -04001121 if (rw == READ && !error) {
Milan Brozee7a4912008-02-08 02:10:46 +00001122 kcryptd_queue_crypt(io);
1123 return;
NeilBrown6712ecf2007-09-27 12:47:43 +02001124 }
Milan Broz8b004452006-10-03 01:15:37 -07001125
Sasha Levin9b81c842015-08-10 19:05:18 -04001126 if (unlikely(error))
1127 io->error = error;
Milan Broz5742fd72008-02-08 02:10:43 +00001128
1129 crypt_dec_pending(io);
Milan Broz8b004452006-10-03 01:15:37 -07001130}
1131
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001132static void clone_init(struct dm_crypt_io *io, struct bio *clone)
Milan Broz8b004452006-10-03 01:15:37 -07001133{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001134 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001135
1136 clone->bi_private = io;
1137 clone->bi_end_io = crypt_endio;
1138 clone->bi_bdev = cc->dev->bdev;
1139 clone->bi_rw = io->base_bio->bi_rw;
1140}
1141
Milan Broz20c82532011-01-13 19:59:53 +00001142static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
Milan Broz8b004452006-10-03 01:15:37 -07001143{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001144 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001145 struct bio *clone;
Milan Broz93e605c2006-10-03 01:15:38 -07001146
Milan Broz8b004452006-10-03 01:15:37 -07001147 /*
Mike Snitzer59779072015-04-09 16:53:24 -04001148 * We need the original biovec array in order to decrypt
1149 * the whole bio data *afterwards* -- thanks to immutable
1150 * biovecs we don't need to worry about the block layer
1151 * modifying the biovec array; so leverage bio_clone_fast().
Milan Broz8b004452006-10-03 01:15:37 -07001152 */
Mike Snitzer59779072015-04-09 16:53:24 -04001153 clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
Jens Axboe7eaceac2011-03-10 08:52:07 +01001154 if (!clone)
Milan Broz20c82532011-01-13 19:59:53 +00001155 return 1;
Milan Broz8b004452006-10-03 01:15:37 -07001156
Milan Broz20c82532011-01-13 19:59:53 +00001157 crypt_inc_pending(io);
1158
Milan Broz8b004452006-10-03 01:15:37 -07001159 clone_init(io, clone);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001160 clone->bi_iter.bi_sector = cc->start + io->sector;
Milan Broz8b004452006-10-03 01:15:37 -07001161
Milan Broz93e605c2006-10-03 01:15:38 -07001162 generic_make_request(clone);
Milan Broz20c82532011-01-13 19:59:53 +00001163 return 0;
Milan Broz8b004452006-10-03 01:15:37 -07001164}
1165
Mikulas Patockadc267622015-02-13 08:25:59 -05001166static void kcryptd_io_read_work(struct work_struct *work)
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001167{
1168 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1169
Mikulas Patockadc267622015-02-13 08:25:59 -05001170 crypt_inc_pending(io);
1171 if (kcryptd_io_read(io, GFP_NOIO))
1172 io->error = -ENOMEM;
1173 crypt_dec_pending(io);
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001174}
1175
Mikulas Patockadc267622015-02-13 08:25:59 -05001176static void kcryptd_queue_read(struct dm_crypt_io *io)
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001177{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001178 struct crypt_config *cc = io->cc;
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001179
Mikulas Patockadc267622015-02-13 08:25:59 -05001180 INIT_WORK(&io->work, kcryptd_io_read_work);
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001181 queue_work(cc->io_queue, &io->work);
1182}
1183
Mikulas Patockadc267622015-02-13 08:25:59 -05001184static void kcryptd_io_write(struct dm_crypt_io *io)
1185{
1186 struct bio *clone = io->ctx.bio_out;
1187
1188 generic_make_request(clone);
1189}
1190
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001191#define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node)
1192
Mikulas Patockadc267622015-02-13 08:25:59 -05001193static int dmcrypt_write(void *data)
1194{
1195 struct crypt_config *cc = data;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001196 struct dm_crypt_io *io;
1197
Mikulas Patockadc267622015-02-13 08:25:59 -05001198 while (1) {
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001199 struct rb_root write_tree;
Mikulas Patockadc267622015-02-13 08:25:59 -05001200 struct blk_plug plug;
1201
1202 DECLARE_WAITQUEUE(wait, current);
1203
1204 spin_lock_irq(&cc->write_thread_wait.lock);
1205continue_locked:
1206
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001207 if (!RB_EMPTY_ROOT(&cc->write_tree))
Mikulas Patockadc267622015-02-13 08:25:59 -05001208 goto pop_from_list;
1209
Mikulas Patockabcbd94f2015-11-19 07:36:50 -05001210 if (unlikely(test_bit(DM_CRYPT_EXIT_THREAD, &cc->flags))) {
1211 spin_unlock_irq(&cc->write_thread_wait.lock);
1212 break;
1213 }
1214
Mikulas Patockadc267622015-02-13 08:25:59 -05001215 __set_current_state(TASK_INTERRUPTIBLE);
1216 __add_wait_queue(&cc->write_thread_wait, &wait);
1217
1218 spin_unlock_irq(&cc->write_thread_wait.lock);
1219
Mikulas Patockadc267622015-02-13 08:25:59 -05001220 schedule();
1221
Mikulas Patockadc267622015-02-13 08:25:59 -05001222 spin_lock_irq(&cc->write_thread_wait.lock);
1223 __remove_wait_queue(&cc->write_thread_wait, &wait);
1224 goto continue_locked;
1225
1226pop_from_list:
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001227 write_tree = cc->write_tree;
1228 cc->write_tree = RB_ROOT;
Mikulas Patockadc267622015-02-13 08:25:59 -05001229 spin_unlock_irq(&cc->write_thread_wait.lock);
1230
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001231 BUG_ON(rb_parent(write_tree.rb_node));
1232
1233 /*
1234 * Note: we cannot walk the tree here with rb_next because
1235 * the structures may be freed when kcryptd_io_write is called.
1236 */
Mikulas Patockadc267622015-02-13 08:25:59 -05001237 blk_start_plug(&plug);
1238 do {
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001239 io = crypt_io_from_node(rb_first(&write_tree));
1240 rb_erase(&io->rb_node, &write_tree);
Mikulas Patockadc267622015-02-13 08:25:59 -05001241 kcryptd_io_write(io);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001242 } while (!RB_EMPTY_ROOT(&write_tree));
Mikulas Patockadc267622015-02-13 08:25:59 -05001243 blk_finish_plug(&plug);
1244 }
1245 return 0;
1246}
1247
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001248static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)
Milan Broz4e4eef62008-02-08 02:10:49 +00001249{
Milan Brozdec1ced2008-02-08 02:10:57 +00001250 struct bio *clone = io->ctx.bio_out;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001251 struct crypt_config *cc = io->cc;
Mikulas Patockadc267622015-02-13 08:25:59 -05001252 unsigned long flags;
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001253 sector_t sector;
1254 struct rb_node **rbp, *parent;
Milan Brozdec1ced2008-02-08 02:10:57 +00001255
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001256 if (unlikely(io->error < 0)) {
Milan Brozdec1ced2008-02-08 02:10:57 +00001257 crypt_free_buffer_pages(cc, clone);
1258 bio_put(clone);
Milan Broz6c031f42008-10-10 13:37:06 +01001259 crypt_dec_pending(io);
Milan Brozdec1ced2008-02-08 02:10:57 +00001260 return;
1261 }
1262
1263 /* crypt_convert should have filled the clone bio */
Kent Overstreet003b5c52013-10-11 15:45:43 -07001264 BUG_ON(io->ctx.iter_out.bi_size);
Milan Brozdec1ced2008-02-08 02:10:57 +00001265
Kent Overstreet4f024f32013-10-11 15:44:27 -07001266 clone->bi_iter.bi_sector = cc->start + io->sector;
Milan Broz899c95d2008-02-08 02:11:02 +00001267
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001268 if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) {
1269 generic_make_request(clone);
1270 return;
1271 }
1272
Mikulas Patockadc267622015-02-13 08:25:59 -05001273 spin_lock_irqsave(&cc->write_thread_wait.lock, flags);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001274 rbp = &cc->write_tree.rb_node;
1275 parent = NULL;
1276 sector = io->sector;
1277 while (*rbp) {
1278 parent = *rbp;
1279 if (sector < crypt_io_from_node(parent)->sector)
1280 rbp = &(*rbp)->rb_left;
1281 else
1282 rbp = &(*rbp)->rb_right;
1283 }
1284 rb_link_node(&io->rb_node, parent, rbp);
1285 rb_insert_color(&io->rb_node, &cc->write_tree);
1286
Mikulas Patockadc267622015-02-13 08:25:59 -05001287 wake_up_locked(&cc->write_thread_wait);
1288 spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags);
Milan Broz4e4eef62008-02-08 02:10:49 +00001289}
1290
Milan Brozfc5a5e92008-10-10 13:37:04 +01001291static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
Milan Broz8b004452006-10-03 01:15:37 -07001292{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001293 struct crypt_config *cc = io->cc;
Milan Broz8b004452006-10-03 01:15:37 -07001294 struct bio *clone;
Milan Brozc8081612008-10-10 13:37:08 +01001295 int crypt_finished;
Milan Brozb635b002008-10-21 17:45:00 +01001296 sector_t sector = io->sector;
Milan Brozdec1ced2008-02-08 02:10:57 +00001297 int r;
Milan Broz8b004452006-10-03 01:15:37 -07001298
Milan Broz93e605c2006-10-03 01:15:38 -07001299 /*
Milan Brozfc5a5e92008-10-10 13:37:04 +01001300 * Prevent io from disappearing until this function completes.
1301 */
1302 crypt_inc_pending(io);
Milan Brozb635b002008-10-21 17:45:00 +01001303 crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
Milan Brozfc5a5e92008-10-10 13:37:04 +01001304
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001305 clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size);
1306 if (unlikely(!clone)) {
1307 io->error = -EIO;
1308 goto dec;
Milan Broz8b004452006-10-03 01:15:37 -07001309 }
Milan Broz899c95d2008-02-08 02:11:02 +00001310
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001311 io->ctx.bio_out = clone;
1312 io->ctx.iter_out = clone->bi_iter;
1313
1314 sector += bio_sectors(clone);
1315
1316 crypt_inc_pending(io);
1317 r = crypt_convert(cc, &io->ctx);
1318 if (r)
1319 io->error = -EIO;
1320 crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending);
1321
1322 /* Encryption was already finished, submit io now */
1323 if (crypt_finished) {
1324 kcryptd_crypt_write_io_submit(io, 0);
1325 io->sector = sector;
1326 }
1327
1328dec:
Milan Broz899c95d2008-02-08 02:11:02 +00001329 crypt_dec_pending(io);
Milan Broz84131db2008-02-08 02:10:59 +00001330}
1331
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001332static void kcryptd_crypt_read_done(struct dm_crypt_io *io)
Milan Broz5742fd72008-02-08 02:10:43 +00001333{
Milan Broz5742fd72008-02-08 02:10:43 +00001334 crypt_dec_pending(io);
1335}
1336
Milan Broz4e4eef62008-02-08 02:10:49 +00001337static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
Milan Broz8b004452006-10-03 01:15:37 -07001338{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001339 struct crypt_config *cc = io->cc;
Milan Broz5742fd72008-02-08 02:10:43 +00001340 int r = 0;
Milan Broz8b004452006-10-03 01:15:37 -07001341
Milan Broz3e1a8bd2008-10-10 13:37:02 +01001342 crypt_inc_pending(io);
Milan Broz3a7f6c92008-02-08 02:11:14 +00001343
Milan Broz53017032008-02-08 02:10:38 +00001344 crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
Milan Broz0c395b02008-02-08 02:10:54 +00001345 io->sector);
Milan Broz8b004452006-10-03 01:15:37 -07001346
Milan Broz5742fd72008-02-08 02:10:43 +00001347 r = crypt_convert(cc, &io->ctx);
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001348 if (r < 0)
1349 io->error = -EIO;
Milan Broz5742fd72008-02-08 02:10:43 +00001350
Mikulas Patocka40b62292012-07-27 15:08:04 +01001351 if (atomic_dec_and_test(&io->ctx.cc_pending))
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001352 kcryptd_crypt_read_done(io);
Milan Broz3a7f6c92008-02-08 02:11:14 +00001353
1354 crypt_dec_pending(io);
Milan Broz8b004452006-10-03 01:15:37 -07001355}
1356
Milan Broz95497a92008-02-08 02:11:12 +00001357static void kcryptd_async_done(struct crypto_async_request *async_req,
1358 int error)
1359{
Huang Yingb2174ee2009-03-16 17:44:33 +00001360 struct dm_crypt_request *dmreq = async_req->data;
1361 struct convert_context *ctx = dmreq->ctx;
Milan Broz95497a92008-02-08 02:11:12 +00001362 struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001363 struct crypt_config *cc = io->cc;
Milan Broz95497a92008-02-08 02:11:12 +00001364
Milan Broz54cea3f2015-05-15 17:00:25 +02001365 /*
1366 * A request from crypto driver backlog is going to be processed now,
1367 * finish the completion and continue in crypt_convert().
1368 * (Callback will be called for the second time for this request.)
1369 */
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001370 if (error == -EINPROGRESS) {
1371 complete(&ctx->restart);
Milan Broz95497a92008-02-08 02:11:12 +00001372 return;
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001373 }
Milan Broz95497a92008-02-08 02:11:12 +00001374
Milan Broz2dc53272011-01-13 19:59:54 +00001375 if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
1376 error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq);
1377
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001378 if (error < 0)
1379 io->error = -EIO;
1380
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001381 crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio);
Milan Broz95497a92008-02-08 02:11:12 +00001382
Mikulas Patocka40b62292012-07-27 15:08:04 +01001383 if (!atomic_dec_and_test(&ctx->cc_pending))
Rabin Vincentc0403ec2015-05-05 15:15:56 +02001384 return;
Milan Broz95497a92008-02-08 02:11:12 +00001385
1386 if (bio_data_dir(io->base_bio) == READ)
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001387 kcryptd_crypt_read_done(io);
Milan Broz95497a92008-02-08 02:11:12 +00001388 else
Mikulas Patocka72c6e7a2012-03-28 18:41:22 +01001389 kcryptd_crypt_write_io_submit(io, 1);
Milan Broz95497a92008-02-08 02:11:12 +00001390}
1391
Milan Broz4e4eef62008-02-08 02:10:49 +00001392static void kcryptd_crypt(struct work_struct *work)
1393{
1394 struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
1395
1396 if (bio_data_dir(io->base_bio) == READ)
1397 kcryptd_crypt_read_convert(io);
1398 else
1399 kcryptd_crypt_write_convert(io);
Milan Broz8b004452006-10-03 01:15:37 -07001400}
1401
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001402static void kcryptd_queue_crypt(struct dm_crypt_io *io)
1403{
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001404 struct crypt_config *cc = io->cc;
Alasdair G Kergon395b1672008-02-08 02:10:52 +00001405
1406 INIT_WORK(&io->work, kcryptd_crypt);
1407 queue_work(cc->crypt_queue, &io->work);
1408}
1409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410/*
1411 * Decode key from its hex representation
1412 */
1413static int crypt_decode_key(u8 *key, char *hex, unsigned int size)
1414{
1415 char buffer[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 unsigned int i;
1417
1418 buffer[2] = '\0';
1419
Milan Broz8b004452006-10-03 01:15:37 -07001420 for (i = 0; i < size; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 buffer[0] = *hex++;
1422 buffer[1] = *hex++;
1423
majianpeng1a66a082012-07-27 15:07:59 +01001424 if (kstrtou8(buffer, 16, &key[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 return -EINVAL;
1426 }
1427
1428 if (*hex != '\0')
1429 return -EINVAL;
1430
1431 return 0;
1432}
1433
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001434static void crypt_free_tfms(struct crypt_config *cc)
Milan Brozd1f96422011-01-13 19:59:54 +00001435{
Milan Brozd1f96422011-01-13 19:59:54 +00001436 unsigned i;
1437
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001438 if (!cc->tfms)
1439 return;
1440
Milan Brozd1f96422011-01-13 19:59:54 +00001441 for (i = 0; i < cc->tfms_count; i++)
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001442 if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) {
Herbert Xubbdb23b2016-01-24 21:16:36 +08001443 crypto_free_skcipher(cc->tfms[i]);
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001444 cc->tfms[i] = NULL;
Milan Brozd1f96422011-01-13 19:59:54 +00001445 }
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001446
1447 kfree(cc->tfms);
1448 cc->tfms = NULL;
Milan Brozd1f96422011-01-13 19:59:54 +00001449}
1450
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001451static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
Milan Brozd1f96422011-01-13 19:59:54 +00001452{
Milan Brozd1f96422011-01-13 19:59:54 +00001453 unsigned i;
1454 int err;
1455
Herbert Xubbdb23b2016-01-24 21:16:36 +08001456 cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_skcipher *),
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001457 GFP_KERNEL);
1458 if (!cc->tfms)
1459 return -ENOMEM;
1460
Milan Brozd1f96422011-01-13 19:59:54 +00001461 for (i = 0; i < cc->tfms_count; i++) {
Herbert Xubbdb23b2016-01-24 21:16:36 +08001462 cc->tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0);
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001463 if (IS_ERR(cc->tfms[i])) {
1464 err = PTR_ERR(cc->tfms[i]);
1465 crypt_free_tfms(cc);
Milan Brozd1f96422011-01-13 19:59:54 +00001466 return err;
1467 }
1468 }
1469
1470 return 0;
1471}
1472
Andi Kleenc0297722011-01-13 19:59:53 +00001473static int crypt_setkey_allcpus(struct crypt_config *cc)
1474{
Milan Brozda31a072013-10-28 23:21:03 +01001475 unsigned subkey_size;
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001476 int err = 0, i, r;
Andi Kleenc0297722011-01-13 19:59:53 +00001477
Milan Brozda31a072013-10-28 23:21:03 +01001478 /* Ignore extra keys (which are used for IV etc) */
1479 subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count);
1480
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001481 for (i = 0; i < cc->tfms_count; i++) {
Herbert Xubbdb23b2016-01-24 21:16:36 +08001482 r = crypto_skcipher_setkey(cc->tfms[i],
1483 cc->key + (i * subkey_size),
1484 subkey_size);
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001485 if (r)
1486 err = r;
Andi Kleenc0297722011-01-13 19:59:53 +00001487 }
1488
1489 return err;
1490}
1491
Milan Broze48d4bb2006-10-03 01:15:37 -07001492static int crypt_set_key(struct crypt_config *cc, char *key)
1493{
Milan Brozde8be5a2011-03-24 13:54:27 +00001494 int r = -EINVAL;
1495 int key_string_len = strlen(key);
1496
Milan Broz69a8cfc2011-01-13 19:59:49 +00001497 /* The key size may not be changed. */
Milan Brozde8be5a2011-03-24 13:54:27 +00001498 if (cc->key_size != (key_string_len >> 1))
1499 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001500
Milan Broz69a8cfc2011-01-13 19:59:49 +00001501 /* Hyphen (which gives a key_size of zero) means there is no key. */
1502 if (!cc->key_size && strcmp(key, "-"))
Milan Brozde8be5a2011-03-24 13:54:27 +00001503 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001504
Milan Broz69a8cfc2011-01-13 19:59:49 +00001505 if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
Milan Brozde8be5a2011-03-24 13:54:27 +00001506 goto out;
Milan Broze48d4bb2006-10-03 01:15:37 -07001507
1508 set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
1509
Milan Brozde8be5a2011-03-24 13:54:27 +00001510 r = crypt_setkey_allcpus(cc);
1511
1512out:
1513 /* Hex key string not needed after here, so wipe it. */
1514 memset(key, '0', key_string_len);
1515
1516 return r;
Milan Broze48d4bb2006-10-03 01:15:37 -07001517}
1518
1519static int crypt_wipe_key(struct crypt_config *cc)
1520{
1521 clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
1522 memset(&cc->key, 0, cc->key_size * sizeof(u8));
Andi Kleenc0297722011-01-13 19:59:53 +00001523
1524 return crypt_setkey_allcpus(cc);
Milan Broze48d4bb2006-10-03 01:15:37 -07001525}
1526
Milan Broz28513fc2010-08-12 04:14:06 +01001527static void crypt_dtr(struct dm_target *ti)
1528{
1529 struct crypt_config *cc = ti->private;
1530
1531 ti->private = NULL;
1532
1533 if (!cc)
1534 return;
1535
Mikulas Patockabcbd94f2015-11-19 07:36:50 -05001536 if (cc->write_thread) {
1537 spin_lock_irq(&cc->write_thread_wait.lock);
1538 set_bit(DM_CRYPT_EXIT_THREAD, &cc->flags);
1539 wake_up_locked(&cc->write_thread_wait);
1540 spin_unlock_irq(&cc->write_thread_wait.lock);
Mikulas Patockadc267622015-02-13 08:25:59 -05001541 kthread_stop(cc->write_thread);
Mikulas Patockabcbd94f2015-11-19 07:36:50 -05001542 }
Mikulas Patockadc267622015-02-13 08:25:59 -05001543
Milan Broz28513fc2010-08-12 04:14:06 +01001544 if (cc->io_queue)
1545 destroy_workqueue(cc->io_queue);
1546 if (cc->crypt_queue)
1547 destroy_workqueue(cc->crypt_queue);
1548
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001549 crypt_free_tfms(cc);
1550
Milan Broz28513fc2010-08-12 04:14:06 +01001551 if (cc->bs)
1552 bioset_free(cc->bs);
1553
Julia Lawall6f659852015-09-13 14:15:05 +02001554 mempool_destroy(cc->page_pool);
1555 mempool_destroy(cc->req_pool);
Milan Broz28513fc2010-08-12 04:14:06 +01001556
1557 if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
1558 cc->iv_gen_ops->dtr(cc);
1559
Milan Broz28513fc2010-08-12 04:14:06 +01001560 if (cc->dev)
1561 dm_put_device(ti, cc->dev);
1562
Milan Broz5ebaee62010-08-12 04:14:07 +01001563 kzfree(cc->cipher);
Milan Broz7dbcd132011-01-13 19:59:52 +00001564 kzfree(cc->cipher_string);
Milan Broz28513fc2010-08-12 04:14:06 +01001565
1566 /* Must zero key material before freeing */
1567 kzfree(cc);
1568}
1569
Milan Broz5ebaee62010-08-12 04:14:07 +01001570static int crypt_ctr_cipher(struct dm_target *ti,
1571 char *cipher_in, char *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572{
Milan Broz5ebaee62010-08-12 04:14:07 +01001573 struct crypt_config *cc = ti->private;
Milan Brozd1f96422011-01-13 19:59:54 +00001574 char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount;
Milan Broz5ebaee62010-08-12 04:14:07 +01001575 char *cipher_api = NULL;
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001576 int ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001577 char dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
Milan Broz5ebaee62010-08-12 04:14:07 +01001579 /* Convert to crypto api definition? */
1580 if (strchr(cipher_in, '(')) {
1581 ti->error = "Bad cipher specification";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 return -EINVAL;
1583 }
1584
Milan Broz7dbcd132011-01-13 19:59:52 +00001585 cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
1586 if (!cc->cipher_string)
1587 goto bad_mem;
1588
Milan Broz5ebaee62010-08-12 04:14:07 +01001589 /*
1590 * Legacy dm-crypt cipher specification
Milan Brozd1f96422011-01-13 19:59:54 +00001591 * cipher[:keycount]-mode-iv:ivopts
Milan Broz5ebaee62010-08-12 04:14:07 +01001592 */
1593 tmp = cipher_in;
Milan Brozd1f96422011-01-13 19:59:54 +00001594 keycount = strsep(&tmp, "-");
1595 cipher = strsep(&keycount, ":");
1596
1597 if (!keycount)
1598 cc->tfms_count = 1;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001599 else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 ||
Milan Brozd1f96422011-01-13 19:59:54 +00001600 !is_power_of_2(cc->tfms_count)) {
1601 ti->error = "Bad cipher key count specification";
1602 return -EINVAL;
1603 }
1604 cc->key_parts = cc->tfms_count;
Milan Brozda31a072013-10-28 23:21:03 +01001605 cc->key_extra_size = 0;
Milan Broz5ebaee62010-08-12 04:14:07 +01001606
1607 cc->cipher = kstrdup(cipher, GFP_KERNEL);
1608 if (!cc->cipher)
1609 goto bad_mem;
1610
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 chainmode = strsep(&tmp, "-");
1612 ivopts = strsep(&tmp, "-");
1613 ivmode = strsep(&ivopts, ":");
1614
1615 if (tmp)
Milan Broz5ebaee62010-08-12 04:14:07 +01001616 DMWARN("Ignoring unexpected additional cipher options");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
Milan Broz7dbcd132011-01-13 19:59:52 +00001618 /*
1619 * For compatibility with the original dm-crypt mapping format, if
1620 * only the cipher name is supplied, use cbc-plain.
1621 */
Milan Broz5ebaee62010-08-12 04:14:07 +01001622 if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 chainmode = "cbc";
1624 ivmode = "plain";
1625 }
1626
Herbert Xud1806f62006-08-22 20:29:17 +10001627 if (strcmp(chainmode, "ecb") && !ivmode) {
Milan Broz5ebaee62010-08-12 04:14:07 +01001628 ti->error = "IV mechanism required";
1629 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 }
1631
Milan Broz5ebaee62010-08-12 04:14:07 +01001632 cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
1633 if (!cipher_api)
1634 goto bad_mem;
1635
1636 ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
1637 "%s(%s)", chainmode, cipher);
1638 if (ret < 0) {
1639 kfree(cipher_api);
1640 goto bad_mem;
Herbert Xud1806f62006-08-22 20:29:17 +10001641 }
1642
Milan Broz5ebaee62010-08-12 04:14:07 +01001643 /* Allocate cipher */
Mikulas Patockafd2d2312012-07-27 15:08:05 +01001644 ret = crypt_alloc_tfms(cc, cipher_api);
1645 if (ret < 0) {
1646 ti->error = "Error allocating crypto tfm";
1647 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Milan Broz5ebaee62010-08-12 04:14:07 +01001650 /* Initialize IV */
Herbert Xubbdb23b2016-01-24 21:16:36 +08001651 cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc));
Milan Broz5ebaee62010-08-12 04:14:07 +01001652 if (cc->iv_size)
1653 /* at least a 64 bit sector number should fit in our buffer */
1654 cc->iv_size = max(cc->iv_size,
1655 (unsigned int)(sizeof(u64) / sizeof(u8)));
1656 else if (ivmode) {
1657 DMWARN("Selected cipher does not support IVs");
1658 ivmode = NULL;
1659 }
1660
1661 /* Choose ivmode, see comments at iv code. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 if (ivmode == NULL)
1663 cc->iv_gen_ops = NULL;
1664 else if (strcmp(ivmode, "plain") == 0)
1665 cc->iv_gen_ops = &crypt_iv_plain_ops;
Milan Broz61afef62009-12-10 23:52:25 +00001666 else if (strcmp(ivmode, "plain64") == 0)
1667 cc->iv_gen_ops = &crypt_iv_plain64_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 else if (strcmp(ivmode, "essiv") == 0)
1669 cc->iv_gen_ops = &crypt_iv_essiv_ops;
Rik Snel48527fa2006-09-03 08:56:39 +10001670 else if (strcmp(ivmode, "benbi") == 0)
1671 cc->iv_gen_ops = &crypt_iv_benbi_ops;
Ludwig Nussel46b47732007-05-09 02:32:55 -07001672 else if (strcmp(ivmode, "null") == 0)
1673 cc->iv_gen_ops = &crypt_iv_null_ops;
Milan Broz34745782011-01-13 19:59:55 +00001674 else if (strcmp(ivmode, "lmk") == 0) {
1675 cc->iv_gen_ops = &crypt_iv_lmk_ops;
Milan Brozed04d982013-10-28 23:21:04 +01001676 /*
1677 * Version 2 and 3 is recognised according
Milan Broz34745782011-01-13 19:59:55 +00001678 * to length of provided multi-key string.
1679 * If present (version 3), last key is used as IV seed.
Milan Brozed04d982013-10-28 23:21:04 +01001680 * All keys (including IV seed) are always the same size.
Milan Broz34745782011-01-13 19:59:55 +00001681 */
Milan Brozda31a072013-10-28 23:21:03 +01001682 if (cc->key_size % cc->key_parts) {
Milan Broz34745782011-01-13 19:59:55 +00001683 cc->key_parts++;
Milan Brozda31a072013-10-28 23:21:03 +01001684 cc->key_extra_size = cc->key_size / cc->key_parts;
1685 }
Milan Brozed04d982013-10-28 23:21:04 +01001686 } else if (strcmp(ivmode, "tcw") == 0) {
1687 cc->iv_gen_ops = &crypt_iv_tcw_ops;
1688 cc->key_parts += 2; /* IV + whitening */
1689 cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE;
Milan Broz34745782011-01-13 19:59:55 +00001690 } else {
Milan Broz5ebaee62010-08-12 04:14:07 +01001691 ret = -EINVAL;
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001692 ti->error = "Invalid IV mode";
Milan Broz28513fc2010-08-12 04:14:06 +01001693 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 }
1695
Milan Brozda31a072013-10-28 23:21:03 +01001696 /* Initialize and set key */
1697 ret = crypt_set_key(cc, key);
1698 if (ret < 0) {
1699 ti->error = "Error decoding and setting key";
1700 goto bad;
1701 }
1702
Milan Broz28513fc2010-08-12 04:14:06 +01001703 /* Allocate IV */
1704 if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
1705 ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
1706 if (ret < 0) {
1707 ti->error = "Error creating IV";
1708 goto bad;
1709 }
Milan Brozb95bf2d2009-12-10 23:51:56 +00001710 }
1711
Milan Broz28513fc2010-08-12 04:14:06 +01001712 /* Initialize IV (set keys for ESSIV etc) */
1713 if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
1714 ret = cc->iv_gen_ops->init(cc);
1715 if (ret < 0) {
1716 ti->error = "Error initialising IV";
1717 goto bad;
1718 }
1719 }
1720
Milan Broz5ebaee62010-08-12 04:14:07 +01001721 ret = 0;
1722bad:
1723 kfree(cipher_api);
1724 return ret;
1725
1726bad_mem:
1727 ti->error = "Cannot allocate cipher strings";
1728 return -ENOMEM;
1729}
1730
1731/*
1732 * Construct an encryption mapping:
1733 * <cipher> <key> <iv_offset> <dev_path> <start>
1734 */
1735static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
1736{
1737 struct crypt_config *cc;
Milan Broz772ae5f2011-08-02 12:32:08 +01001738 unsigned int key_size, opt_params;
Milan Broz5ebaee62010-08-12 04:14:07 +01001739 unsigned long long tmpll;
1740 int ret;
Mikulas Patockad49ec522014-08-28 11:09:31 -04001741 size_t iv_size_padding;
Milan Broz772ae5f2011-08-02 12:32:08 +01001742 struct dm_arg_set as;
1743 const char *opt_string;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001744 char dummy;
Milan Broz5ebaee62010-08-12 04:14:07 +01001745
Milan Broz772ae5f2011-08-02 12:32:08 +01001746 static struct dm_arg _args[] = {
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001747 {0, 3, "Invalid number of feature args"},
Milan Broz772ae5f2011-08-02 12:32:08 +01001748 };
1749
1750 if (argc < 5) {
Milan Broz5ebaee62010-08-12 04:14:07 +01001751 ti->error = "Not enough arguments";
1752 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 }
1754
Milan Broz5ebaee62010-08-12 04:14:07 +01001755 key_size = strlen(argv[1]) >> 1;
1756
1757 cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
1758 if (!cc) {
1759 ti->error = "Cannot allocate encryption context";
1760 return -ENOMEM;
1761 }
Milan Broz69a8cfc2011-01-13 19:59:49 +00001762 cc->key_size = key_size;
Milan Broz5ebaee62010-08-12 04:14:07 +01001763
1764 ti->private = cc;
1765 ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
1766 if (ret < 0)
1767 goto bad;
1768
Herbert Xubbdb23b2016-01-24 21:16:36 +08001769 cc->dmreq_start = sizeof(struct skcipher_request);
1770 cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc));
Mikulas Patockad49ec522014-08-28 11:09:31 -04001771 cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request));
1772
Herbert Xubbdb23b2016-01-24 21:16:36 +08001773 if (crypto_skcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) {
Mikulas Patockad49ec522014-08-28 11:09:31 -04001774 /* Allocate the padding exactly */
1775 iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request))
Herbert Xubbdb23b2016-01-24 21:16:36 +08001776 & crypto_skcipher_alignmask(any_tfm(cc));
Mikulas Patockad49ec522014-08-28 11:09:31 -04001777 } else {
1778 /*
1779 * If the cipher requires greater alignment than kmalloc
1780 * alignment, we don't know the exact position of the
1781 * initialization vector. We must assume worst case.
1782 */
Herbert Xubbdb23b2016-01-24 21:16:36 +08001783 iv_size_padding = crypto_skcipher_alignmask(any_tfm(cc));
Mikulas Patockad49ec522014-08-28 11:09:31 -04001784 }
Milan Brozddd42ed2008-02-08 02:11:07 +00001785
Mikulas Patocka94f5e022015-02-13 08:25:26 -05001786 ret = -ENOMEM;
Milan Brozddd42ed2008-02-08 02:11:07 +00001787 cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
Mikulas Patockad49ec522014-08-28 11:09:31 -04001788 sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size);
Milan Brozddd42ed2008-02-08 02:11:07 +00001789 if (!cc->req_pool) {
1790 ti->error = "Cannot allocate crypt request mempool";
Milan Broz28513fc2010-08-12 04:14:06 +01001791 goto bad;
Milan Brozddd42ed2008-02-08 02:11:07 +00001792 }
Milan Brozddd42ed2008-02-08 02:11:07 +00001793
Mike Snitzer30187e12016-01-31 13:28:26 -05001794 cc->per_bio_data_size = ti->per_io_data_size =
Mikulas Patockad49ec522014-08-28 11:09:31 -04001795 ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start +
1796 sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size,
1797 ARCH_KMALLOC_MINALIGN);
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001798
Mikulas Patockacf2f1ab2015-02-13 08:23:52 -05001799 cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 if (!cc->page_pool) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001801 ti->error = "Cannot allocate page mempool";
Milan Broz28513fc2010-08-12 04:14:06 +01001802 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 }
1804
Jens Axboebb799ca2008-12-10 15:35:05 +01001805 cc->bs = bioset_create(MIN_IOS, 0);
Milan Broz6a24c712006-10-03 01:15:40 -07001806 if (!cc->bs) {
1807 ti->error = "Cannot allocate crypt bioset";
Milan Broz28513fc2010-08-12 04:14:06 +01001808 goto bad;
Milan Broz6a24c712006-10-03 01:15:40 -07001809 }
1810
Mikulas Patocka7145c242015-02-13 08:24:41 -05001811 mutex_init(&cc->bio_alloc_lock);
1812
Milan Broz28513fc2010-08-12 04:14:06 +01001813 ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001814 if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001815 ti->error = "Invalid iv_offset sector";
Milan Broz28513fc2010-08-12 04:14:06 +01001816 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 }
Andrew Morton4ee218c2006-03-27 01:17:48 -08001818 cc->iv_offset = tmpll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
Vivek Goyale80d1c82015-07-31 09:20:36 -04001820 ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
1821 if (ret) {
Milan Broz28513fc2010-08-12 04:14:06 +01001822 ti->error = "Device lookup failed";
1823 goto bad;
1824 }
1825
Vivek Goyale80d1c82015-07-31 09:20:36 -04001826 ret = -EINVAL;
Mikulas Patocka31998ef2012-03-28 18:41:26 +01001827 if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -07001828 ti->error = "Invalid device sector";
Milan Broz28513fc2010-08-12 04:14:06 +01001829 goto bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 }
Andrew Morton4ee218c2006-03-27 01:17:48 -08001831 cc->start = tmpll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832
Milan Broz772ae5f2011-08-02 12:32:08 +01001833 argv += 5;
1834 argc -= 5;
1835
1836 /* Optional parameters */
1837 if (argc) {
1838 as.argc = argc;
1839 as.argv = argv;
1840
1841 ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
1842 if (ret)
1843 goto bad;
1844
Wei Yongjun44c144f2015-04-16 22:00:50 -04001845 ret = -EINVAL;
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001846 while (opt_params--) {
1847 opt_string = dm_shift_arg(&as);
1848 if (!opt_string) {
1849 ti->error = "Not enough feature arguments";
1850 goto bad;
1851 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001852
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001853 if (!strcasecmp(opt_string, "allow_discards"))
1854 ti->num_discard_bios = 1;
1855
1856 else if (!strcasecmp(opt_string, "same_cpu_crypt"))
1857 set_bit(DM_CRYPT_SAME_CPU, &cc->flags);
1858
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001859 else if (!strcasecmp(opt_string, "submit_from_crypt_cpus"))
1860 set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
1861
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001862 else {
1863 ti->error = "Invalid feature arguments";
1864 goto bad;
1865 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001866 }
1867 }
1868
Milan Broz28513fc2010-08-12 04:14:06 +01001869 ret = -ENOMEM;
Tejun Heo670368a2013-07-30 08:40:21 -04001870 cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
Milan Brozcabf08e2007-10-19 22:38:58 +01001871 if (!cc->io_queue) {
1872 ti->error = "Couldn't create kcryptd io queue";
Milan Broz28513fc2010-08-12 04:14:06 +01001873 goto bad;
Milan Brozcabf08e2007-10-19 22:38:58 +01001874 }
1875
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001876 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
1877 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
1878 else
1879 cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
1880 num_online_cpus());
Milan Brozcabf08e2007-10-19 22:38:58 +01001881 if (!cc->crypt_queue) {
Milan Broz9934a8b2007-10-19 22:38:57 +01001882 ti->error = "Couldn't create kcryptd queue";
Milan Broz28513fc2010-08-12 04:14:06 +01001883 goto bad;
Milan Broz9934a8b2007-10-19 22:38:57 +01001884 }
1885
Mikulas Patockadc267622015-02-13 08:25:59 -05001886 init_waitqueue_head(&cc->write_thread_wait);
Mikulas Patockab3c5fd32015-02-13 08:27:41 -05001887 cc->write_tree = RB_ROOT;
Mikulas Patockadc267622015-02-13 08:25:59 -05001888
1889 cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write");
1890 if (IS_ERR(cc->write_thread)) {
1891 ret = PTR_ERR(cc->write_thread);
1892 cc->write_thread = NULL;
1893 ti->error = "Couldn't spawn write thread";
1894 goto bad;
1895 }
1896 wake_up_process(cc->write_thread);
1897
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +00001898 ti->num_flush_bios = 1;
Alasdair G Kergon0ac55482012-07-27 15:08:08 +01001899 ti->discard_zeroes_data_unsupported = true;
Milan Broz983c7db2011-09-25 23:26:21 +01001900
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 return 0;
1902
Milan Broz28513fc2010-08-12 04:14:06 +01001903bad:
1904 crypt_dtr(ti);
1905 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906}
1907
Mikulas Patocka7de3ee52012-12-21 20:23:41 +00001908static int crypt_map(struct dm_target *ti, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909{
Alasdair G Kergon028867a2007-07-12 17:26:32 +01001910 struct dm_crypt_io *io;
Alasdair G Kergon49a8a922012-07-27 15:08:05 +01001911 struct crypt_config *cc = ti->private;
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001912
Milan Broz772ae5f2011-08-02 12:32:08 +01001913 /*
1914 * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues.
1915 * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight
1916 * - for REQ_DISCARD caller must use flush if IO ordering matters
1917 */
1918 if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001919 bio->bi_bdev = cc->dev->bdev;
Milan Broz772ae5f2011-08-02 12:32:08 +01001920 if (bio_sectors(bio))
Kent Overstreet4f024f32013-10-11 15:44:27 -07001921 bio->bi_iter.bi_sector = cc->start +
1922 dm_target_offset(ti, bio->bi_iter.bi_sector);
Mikulas Patocka647c7db2009-06-22 10:12:23 +01001923 return DM_MAPIO_REMAPPED;
1924 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925
Mikulas Patocka298a9fa2014-03-28 15:51:55 -04001926 io = dm_per_bio_data(bio, cc->per_bio_data_size);
1927 crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
Herbert Xubbdb23b2016-01-24 21:16:36 +08001928 io->ctx.req = (struct skcipher_request *)(io + 1);
Milan Brozcabf08e2007-10-19 22:38:58 +01001929
Milan Broz20c82532011-01-13 19:59:53 +00001930 if (bio_data_dir(io->base_bio) == READ) {
1931 if (kcryptd_io_read(io, GFP_NOWAIT))
Mikulas Patockadc267622015-02-13 08:25:59 -05001932 kcryptd_queue_read(io);
Milan Broz20c82532011-01-13 19:59:53 +00001933 } else
Milan Brozcabf08e2007-10-19 22:38:58 +01001934 kcryptd_queue_crypt(io);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935
Kiyoshi Uedad2a7ad22006-12-08 02:41:06 -08001936 return DM_MAPIO_SUBMITTED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937}
1938
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001939static void crypt_status(struct dm_target *ti, status_type_t type,
1940 unsigned status_flags, char *result, unsigned maxlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941{
Milan Broz5ebaee62010-08-12 04:14:07 +01001942 struct crypt_config *cc = ti->private;
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001943 unsigned i, sz = 0;
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001944 int num_feature_args = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
1946 switch (type) {
1947 case STATUSTYPE_INFO:
1948 result[0] = '\0';
1949 break;
1950
1951 case STATUSTYPE_TABLE:
Milan Broz7dbcd132011-01-13 19:59:52 +00001952 DMEMIT("%s ", cc->cipher_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001954 if (cc->key_size > 0)
1955 for (i = 0; i < cc->key_size; i++)
1956 DMEMIT("%02x", cc->key[i]);
1957 else
1958 DMEMIT("-");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959
Andrew Morton4ee218c2006-03-27 01:17:48 -08001960 DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
1961 cc->dev->name, (unsigned long long)cc->start);
Milan Broz772ae5f2011-08-02 12:32:08 +01001962
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001963 num_feature_args += !!ti->num_discard_bios;
1964 num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags);
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001965 num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags);
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001966 if (num_feature_args) {
1967 DMEMIT(" %d", num_feature_args);
1968 if (ti->num_discard_bios)
1969 DMEMIT(" allow_discards");
1970 if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
1971 DMEMIT(" same_cpu_crypt");
Mikulas Patocka0f5d8e62015-02-13 08:27:08 -05001972 if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags))
1973 DMEMIT(" submit_from_crypt_cpus");
Mikulas Patockaf3396c582015-02-13 08:23:09 -05001974 }
Milan Broz772ae5f2011-08-02 12:32:08 +01001975
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 break;
1977 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978}
1979
Milan Broze48d4bb2006-10-03 01:15:37 -07001980static void crypt_postsuspend(struct dm_target *ti)
1981{
1982 struct crypt_config *cc = ti->private;
1983
1984 set_bit(DM_CRYPT_SUSPENDED, &cc->flags);
1985}
1986
1987static int crypt_preresume(struct dm_target *ti)
1988{
1989 struct crypt_config *cc = ti->private;
1990
1991 if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) {
1992 DMERR("aborting resume - crypt key is not set.");
1993 return -EAGAIN;
1994 }
1995
1996 return 0;
1997}
1998
1999static void crypt_resume(struct dm_target *ti)
2000{
2001 struct crypt_config *cc = ti->private;
2002
2003 clear_bit(DM_CRYPT_SUSPENDED, &cc->flags);
2004}
2005
2006/* Message interface
2007 * key set <key>
2008 * key wipe
2009 */
2010static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
2011{
2012 struct crypt_config *cc = ti->private;
Milan Broz542da312009-12-10 23:51:57 +00002013 int ret = -EINVAL;
Milan Broze48d4bb2006-10-03 01:15:37 -07002014
2015 if (argc < 2)
2016 goto error;
2017
Mike Snitzer498f0102011-08-02 12:32:04 +01002018 if (!strcasecmp(argv[0], "key")) {
Milan Broze48d4bb2006-10-03 01:15:37 -07002019 if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
2020 DMWARN("not suspended during key manipulation.");
2021 return -EINVAL;
2022 }
Mike Snitzer498f0102011-08-02 12:32:04 +01002023 if (argc == 3 && !strcasecmp(argv[1], "set")) {
Milan Broz542da312009-12-10 23:51:57 +00002024 ret = crypt_set_key(cc, argv[2]);
2025 if (ret)
2026 return ret;
2027 if (cc->iv_gen_ops && cc->iv_gen_ops->init)
2028 ret = cc->iv_gen_ops->init(cc);
2029 return ret;
2030 }
Mike Snitzer498f0102011-08-02 12:32:04 +01002031 if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
Milan Broz542da312009-12-10 23:51:57 +00002032 if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
2033 ret = cc->iv_gen_ops->wipe(cc);
2034 if (ret)
2035 return ret;
2036 }
Milan Broze48d4bb2006-10-03 01:15:37 -07002037 return crypt_wipe_key(cc);
Milan Broz542da312009-12-10 23:51:57 +00002038 }
Milan Broze48d4bb2006-10-03 01:15:37 -07002039 }
2040
2041error:
2042 DMWARN("unrecognised message received.");
2043 return -EINVAL;
2044}
2045
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002046static int crypt_iterate_devices(struct dm_target *ti,
2047 iterate_devices_callout_fn fn, void *data)
2048{
2049 struct crypt_config *cc = ti->private;
2050
Mike Snitzer5dea2712009-07-23 20:30:42 +01002051 return fn(ti, cc->dev, cc->start, ti->len, data);
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002052}
2053
Mike Snitzer586b2862015-09-09 21:34:51 -04002054static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits)
2055{
2056 /*
2057 * Unfortunate constraint that is required to avoid the potential
2058 * for exceeding underlying device's max_segments limits -- due to
2059 * crypt_alloc_buffer() possibly allocating pages for the encryption
2060 * bio that are not as physically contiguous as the original bio.
2061 */
2062 limits->max_segment_size = PAGE_SIZE;
2063}
2064
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065static struct target_type crypt_target = {
2066 .name = "crypt",
Mike Snitzer586b2862015-09-09 21:34:51 -04002067 .version = {1, 14, 1},
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 .module = THIS_MODULE,
2069 .ctr = crypt_ctr,
2070 .dtr = crypt_dtr,
2071 .map = crypt_map,
2072 .status = crypt_status,
Milan Broze48d4bb2006-10-03 01:15:37 -07002073 .postsuspend = crypt_postsuspend,
2074 .preresume = crypt_preresume,
2075 .resume = crypt_resume,
2076 .message = crypt_message,
Mike Snitzeraf4874e2009-06-22 10:12:33 +01002077 .iterate_devices = crypt_iterate_devices,
Mike Snitzer586b2862015-09-09 21:34:51 -04002078 .io_hints = crypt_io_hints,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079};
2080
2081static int __init dm_crypt_init(void)
2082{
2083 int r;
2084
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 r = dm_register_target(&crypt_target);
Mikulas Patocka94f5e022015-02-13 08:25:26 -05002086 if (r < 0)
Alasdair G Kergon72d94862006-06-26 00:27:35 -07002087 DMERR("register failed %d", r);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 return r;
2090}
2091
2092static void __exit dm_crypt_exit(void)
2093{
Mikulas Patocka10d3bd02009-01-06 03:04:58 +00002094 dm_unregister_target(&crypt_target);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095}
2096
2097module_init(dm_crypt_init);
2098module_exit(dm_crypt_exit);
2099
Jana Saoutbf142992014-06-24 14:27:04 -04002100MODULE_AUTHOR("Jana Saout <jana@saout.de>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption");
2102MODULE_LICENSE("GPL");