Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Jana Saout | bf14299 | 2014-06-24 14:27:04 -0400 | [diff] [blame] | 2 | * Copyright (C) 2003 Jana Saout <jana@saout.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 4 | * Copyright (C) 2006-2015 Red Hat, Inc. All rights reserved. |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 5 | * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This file is released under the GPL. |
| 8 | */ |
| 9 | |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 10 | #include <linux/completion.h> |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 11 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #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 Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 21 | #include <linux/kthread.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 22 | #include <linux/backing-dev.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 23 | #include <linux/atomic.h> |
David Hardeman | 378f058 | 2005-09-17 17:55:31 +1000 | [diff] [blame] | 24 | #include <linux/scatterlist.h> |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 25 | #include <linux/rbtree.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/page.h> |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 27 | #include <asm/unaligned.h> |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 28 | #include <crypto/hash.h> |
| 29 | #include <crypto/md5.h> |
| 30 | #include <crypto/algapi.h> |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 31 | #include <crypto/skcipher.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Mikulas Patocka | 586e80e | 2008-10-21 17:44:59 +0100 | [diff] [blame] | 33 | #include <linux/device-mapper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 35 | #define DM_MSG_PREFIX "crypt" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | * context holding the current state of a multi-part conversion |
| 39 | */ |
| 40 | struct convert_context { |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 41 | struct completion restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | struct bio *bio_in; |
| 43 | struct bio *bio_out; |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 44 | struct bvec_iter iter_in; |
| 45 | struct bvec_iter iter_out; |
Mikulas Patocka | c66029f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 46 | sector_t cc_sector; |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 47 | atomic_t cc_pending; |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 48 | struct skcipher_request *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | }; |
| 50 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 51 | /* |
| 52 | * per bio private data |
| 53 | */ |
| 54 | struct dm_crypt_io { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 55 | struct crypt_config *cc; |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 56 | struct bio *base_bio; |
| 57 | struct work_struct work; |
| 58 | |
| 59 | struct convert_context ctx; |
| 60 | |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 61 | atomic_t io_pending; |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 62 | int error; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 63 | sector_t sector; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 64 | |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 65 | struct rb_node rb_node; |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 66 | } CRYPTO_MINALIGN_ATTR; |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 67 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 68 | struct dm_crypt_request { |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 69 | struct convert_context *ctx; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 70 | struct scatterlist sg_in; |
| 71 | struct scatterlist sg_out; |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 72 | sector_t iv_sector; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 73 | }; |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | struct crypt_config; |
| 76 | |
| 77 | struct crypt_iv_operations { |
| 78 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 79 | const char *opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | void (*dtr)(struct crypt_config *cc); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 81 | int (*init)(struct crypt_config *cc); |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 82 | int (*wipe)(struct crypt_config *cc); |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 83 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | }; |
| 88 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 89 | struct iv_essiv_private { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 90 | struct crypto_ahash *hash_tfm; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 91 | u8 *salt; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 92 | }; |
| 93 | |
| 94 | struct iv_benbi_private { |
| 95 | int shift; |
| 96 | }; |
| 97 | |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 98 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
| 99 | struct iv_lmk_private { |
| 100 | struct crypto_shash *hash_tfm; |
| 101 | u8 *seed; |
| 102 | }; |
| 103 | |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 104 | #define TCW_WHITENING_SIZE 16 |
| 105 | struct iv_tcw_private { |
| 106 | struct crypto_shash *crc32_tfm; |
| 107 | u8 *iv_seed; |
| 108 | u8 *whitening; |
| 109 | }; |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | /* |
| 112 | * Crypt: maps a linear range of a block device |
| 113 | * and encrypts / decrypts at the same time. |
| 114 | */ |
Mikulas Patocka | 0f5d8e6 | 2015-02-13 08:27:08 -0500 | [diff] [blame] | 115 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, |
Rabin Vincent | f659b10 | 2016-09-21 16:22:29 +0200 | [diff] [blame] | 116 | DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 117 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 118 | enum cipher_flags { |
| 119 | CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ |
| 120 | }; |
| 121 | |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 122 | /* |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 123 | * The fields in here must be read only after initialization. |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 124 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | struct crypt_config { |
| 126 | struct dm_dev *dev; |
| 127 | sector_t start; |
| 128 | |
| 129 | /* |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 130 | * pool for per bio private data, crypto requests and |
| 131 | * encryption requeusts/buffer pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | */ |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 133 | mempool_t *req_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | mempool_t *page_pool; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 135 | struct bio_set *bs; |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 136 | struct mutex bio_alloc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 138 | struct workqueue_struct *io_queue; |
| 139 | struct workqueue_struct *crypt_queue; |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 140 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 141 | struct task_struct *write_thread; |
| 142 | wait_queue_head_t write_thread_wait; |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 143 | struct rb_root write_tree; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 144 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 145 | char *cipher; |
Milan Broz | 7dbcd13 | 2011-01-13 19:59:52 +0000 | [diff] [blame] | 146 | char *cipher_string; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | struct crypt_iv_operations *iv_gen_ops; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 149 | union { |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 150 | struct iv_essiv_private essiv; |
| 151 | struct iv_benbi_private benbi; |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 152 | struct iv_lmk_private lmk; |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 153 | struct iv_tcw_private tcw; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 154 | } iv_gen_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | sector_t iv_offset; |
| 156 | unsigned int iv_size; |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 157 | unsigned short int sector_size; |
| 158 | unsigned char sector_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 160 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
| 161 | void *iv_private; |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 162 | struct crypto_skcipher **tfms; |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 163 | unsigned tfms_count; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 164 | unsigned long cipher_flags; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 165 | |
| 166 | /* |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 167 | * Layout of each crypto request: |
| 168 | * |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 169 | * struct skcipher_request |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 170 | * context |
| 171 | * padding |
| 172 | * struct dm_crypt_request |
| 173 | * padding |
| 174 | * IV |
| 175 | * |
| 176 | * The padding is added so that dm_crypt_request and the IV are |
| 177 | * correctly aligned. |
| 178 | */ |
| 179 | unsigned int dmreq_start; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 180 | |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 181 | unsigned int per_bio_data_size; |
| 182 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 183 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | unsigned int key_size; |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 185 | unsigned int key_parts; /* independent parts in key buffer */ |
| 186 | unsigned int key_extra_size; /* additional keys length */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | u8 key[0]; |
| 188 | }; |
| 189 | |
Mikulas Patocka | 0a83df6 | 2016-07-15 17:30:20 -0400 | [diff] [blame] | 190 | #define MIN_IOS 64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 192 | static void clone_init(struct dm_crypt_io *, struct bio *); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 193 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 194 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 195 | |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 196 | /* |
| 197 | * Use this to access cipher attributes that are the same for each CPU. |
| 198 | */ |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 199 | static struct crypto_skcipher *any_tfm(struct crypt_config *cc) |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 200 | { |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 201 | return cc->tfms[0]; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 202 | } |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | * Different IV generation algorithms: |
| 206 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 207 | * plain: the initial vector is the 32-bit little-endian version of the sector |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 208 | * number, padded with zeros if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | * |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 210 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
| 211 | * number, padded with zeros if necessary. |
| 212 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 213 | * essiv: "encrypted sector|salt initial vector", the sector number is |
| 214 | * encrypted with the bulk cipher using a salt as key. The salt |
| 215 | * should be derived from the bulk cipher's key via hashing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | * |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 217 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
| 218 | * (needed for LRW-32-AES and possible other narrow block modes) |
| 219 | * |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 220 | * null: the initial vector is always zero. Provides compatibility with |
| 221 | * obsolete loop_fish2 devices. Do not use for new devices. |
| 222 | * |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 223 | * lmk: Compatible implementation of the block chaining mode used |
| 224 | * by the Loop-AES block device encryption system |
| 225 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ |
| 226 | * It operates on full 512 byte sectors and uses CBC |
| 227 | * with an IV derived from the sector number, the data and |
| 228 | * optionally extra IV seed. |
| 229 | * This means that after decryption the first block |
| 230 | * of sector must be tweaked according to decrypted data. |
| 231 | * Loop-AES can use three encryption schemes: |
| 232 | * version 1: is plain aes-cbc mode |
| 233 | * version 2: uses 64 multikey scheme with lmk IV generator |
| 234 | * version 3: the same as version 2 with additional IV seed |
| 235 | * (it uses 65 keys, last key is used as IV seed) |
| 236 | * |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 237 | * tcw: Compatible implementation of the block chaining mode used |
| 238 | * by the TrueCrypt device encryption system (prior to version 4.1). |
Milan Broz | e44f23b | 2015-04-05 18:03:10 +0200 | [diff] [blame] | 239 | * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 240 | * It operates on full 512 byte sectors and uses CBC |
| 241 | * with an IV derived from initial key and the sector number. |
| 242 | * In addition, whitening value is applied on every sector, whitening |
| 243 | * is calculated from initial key, sector number and mixed using CRC32. |
| 244 | * Note that this encryption scheme is vulnerable to watermarking attacks |
| 245 | * and should be used for old compatible containers access only. |
| 246 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * plumb: unimplemented, see: |
| 248 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 |
| 249 | */ |
| 250 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 251 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
| 252 | struct dm_crypt_request *dmreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
| 254 | memset(iv, 0, cc->iv_size); |
Alasdair G Kergon | 283a832 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 255 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 260 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 261 | struct dm_crypt_request *dmreq) |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 262 | { |
| 263 | memset(iv, 0, cc->iv_size); |
Alasdair G Kergon | 283a832 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 264 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 269 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
| 270 | static int crypt_iv_essiv_init(struct crypt_config *cc) |
| 271 | { |
| 272 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 273 | AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 274 | struct scatterlist sg; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 275 | struct crypto_cipher *essiv_tfm; |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 276 | int err; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 277 | |
| 278 | sg_init_one(&sg, cc->key, cc->key_size); |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 279 | ahash_request_set_tfm(req, essiv->hash_tfm); |
| 280 | ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); |
| 281 | ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 282 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 283 | err = crypto_ahash_digest(req); |
| 284 | ahash_request_zero(req); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 285 | if (err) |
| 286 | return err; |
| 287 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 288 | essiv_tfm = cc->iv_private; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 289 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 290 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 291 | crypto_ahash_digestsize(essiv->hash_tfm)); |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 292 | if (err) |
| 293 | return err; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 294 | |
| 295 | return 0; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 296 | } |
| 297 | |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 298 | /* Wipe salt and reset key derived from volume key */ |
| 299 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) |
| 300 | { |
| 301 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 302 | unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 303 | struct crypto_cipher *essiv_tfm; |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 304 | int r, err = 0; |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 305 | |
| 306 | memset(essiv->salt, 0, salt_size); |
| 307 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 308 | essiv_tfm = cc->iv_private; |
| 309 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); |
| 310 | if (r) |
| 311 | err = r; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 312 | |
| 313 | return err; |
| 314 | } |
| 315 | |
| 316 | /* Set up per cpu cipher state */ |
| 317 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, |
| 318 | struct dm_target *ti, |
| 319 | u8 *salt, unsigned saltsize) |
| 320 | { |
| 321 | struct crypto_cipher *essiv_tfm; |
| 322 | int err; |
| 323 | |
| 324 | /* Setup the essiv_tfm with the given salt */ |
| 325 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 326 | if (IS_ERR(essiv_tfm)) { |
| 327 | ti->error = "Error allocating crypto tfm for ESSIV"; |
| 328 | return essiv_tfm; |
| 329 | } |
| 330 | |
| 331 | if (crypto_cipher_blocksize(essiv_tfm) != |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 332 | crypto_skcipher_ivsize(any_tfm(cc))) { |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 333 | ti->error = "Block size of ESSIV cipher does " |
| 334 | "not match IV size of block cipher"; |
| 335 | crypto_free_cipher(essiv_tfm); |
| 336 | return ERR_PTR(-EINVAL); |
| 337 | } |
| 338 | |
| 339 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
| 340 | if (err) { |
| 341 | ti->error = "Failed to set key for ESSIV cipher"; |
| 342 | crypto_free_cipher(essiv_tfm); |
| 343 | return ERR_PTR(err); |
| 344 | } |
| 345 | |
| 346 | return essiv_tfm; |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 347 | } |
| 348 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 349 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
| 350 | { |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 351 | struct crypto_cipher *essiv_tfm; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 352 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
| 353 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 354 | crypto_free_ahash(essiv->hash_tfm); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 355 | essiv->hash_tfm = NULL; |
| 356 | |
| 357 | kzfree(essiv->salt); |
| 358 | essiv->salt = NULL; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 359 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 360 | essiv_tfm = cc->iv_private; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 361 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 362 | if (essiv_tfm) |
| 363 | crypto_free_cipher(essiv_tfm); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 364 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 365 | cc->iv_private = NULL; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 366 | } |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 369 | const char *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 371 | struct crypto_cipher *essiv_tfm = NULL; |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 372 | struct crypto_ahash *hash_tfm = NULL; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 373 | u8 *salt = NULL; |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 374 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 376 | if (!opts) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 377 | ti->error = "Digest algorithm missing for ESSIV mode"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return -EINVAL; |
| 379 | } |
| 380 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 381 | /* Allocate hash algorithm */ |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 382 | hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 383 | if (IS_ERR(hash_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 384 | ti->error = "Error initializing ESSIV hash"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 385 | err = PTR_ERR(hash_tfm); |
| 386 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 389 | salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 390 | if (!salt) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 391 | ti->error = "Error kmallocing salt storage in ESSIV"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 392 | err = -ENOMEM; |
| 393 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 396 | cc->iv_gen_private.essiv.salt = salt; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 397 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
| 398 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 399 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 400 | crypto_ahash_digestsize(hash_tfm)); |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 401 | if (IS_ERR(essiv_tfm)) { |
| 402 | crypt_iv_essiv_dtr(cc); |
| 403 | return PTR_ERR(essiv_tfm); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 404 | } |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 405 | cc->iv_private = essiv_tfm; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | return 0; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 408 | |
| 409 | bad: |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 410 | if (hash_tfm && !IS_ERR(hash_tfm)) |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 411 | crypto_free_ahash(hash_tfm); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 412 | kfree(salt); |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 413 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
| 415 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 416 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
| 417 | struct dm_crypt_request *dmreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | { |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 419 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | memset(iv, 0, cc->iv_size); |
Alasdair G Kergon | 283a832 | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 422 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 423 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | return 0; |
| 426 | } |
| 427 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 428 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 429 | const char *opts) |
| 430 | { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 431 | unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 432 | int log = ilog2(bs); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 433 | |
| 434 | /* we need to calculate how far we must shift the sector count |
| 435 | * to get the cipher block count, we use this shift in _gen */ |
| 436 | |
| 437 | if (1 << log != bs) { |
| 438 | ti->error = "cypher blocksize is not a power of 2"; |
| 439 | return -EINVAL; |
| 440 | } |
| 441 | |
| 442 | if (log > 9) { |
| 443 | ti->error = "cypher blocksize is > 512"; |
| 444 | return -EINVAL; |
| 445 | } |
| 446 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 447 | cc->iv_gen_private.benbi.shift = 9 - log; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) |
| 453 | { |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 454 | } |
| 455 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 456 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
| 457 | struct dm_crypt_request *dmreq) |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 458 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 459 | __be64 val; |
| 460 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 461 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 462 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 463 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 464 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | return 0; |
| 467 | } |
| 468 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 469 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
| 470 | struct dm_crypt_request *dmreq) |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 471 | { |
| 472 | memset(iv, 0, cc->iv_size); |
| 473 | |
| 474 | return 0; |
| 475 | } |
| 476 | |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 477 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
| 478 | { |
| 479 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; |
| 480 | |
| 481 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) |
| 482 | crypto_free_shash(lmk->hash_tfm); |
| 483 | lmk->hash_tfm = NULL; |
| 484 | |
| 485 | kzfree(lmk->seed); |
| 486 | lmk->seed = NULL; |
| 487 | } |
| 488 | |
| 489 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 490 | const char *opts) |
| 491 | { |
| 492 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; |
| 493 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 494 | if (cc->sector_size != (1 << SECTOR_SHIFT)) { |
| 495 | ti->error = "Unsupported sector size for LMK"; |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 499 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); |
| 500 | if (IS_ERR(lmk->hash_tfm)) { |
| 501 | ti->error = "Error initializing LMK hash"; |
| 502 | return PTR_ERR(lmk->hash_tfm); |
| 503 | } |
| 504 | |
| 505 | /* No seed in LMK version 2 */ |
| 506 | if (cc->key_parts == cc->tfms_count) { |
| 507 | lmk->seed = NULL; |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); |
| 512 | if (!lmk->seed) { |
| 513 | crypt_iv_lmk_dtr(cc); |
| 514 | ti->error = "Error kmallocing seed storage in LMK"; |
| 515 | return -ENOMEM; |
| 516 | } |
| 517 | |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | static int crypt_iv_lmk_init(struct crypt_config *cc) |
| 522 | { |
| 523 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; |
| 524 | int subkey_size = cc->key_size / cc->key_parts; |
| 525 | |
| 526 | /* LMK seed is on the position of LMK_KEYS + 1 key */ |
| 527 | if (lmk->seed) |
| 528 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), |
| 529 | crypto_shash_digestsize(lmk->hash_tfm)); |
| 530 | |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) |
| 535 | { |
| 536 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; |
| 537 | |
| 538 | if (lmk->seed) |
| 539 | memset(lmk->seed, 0, LMK_SEED_SIZE); |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, |
| 545 | struct dm_crypt_request *dmreq, |
| 546 | u8 *data) |
| 547 | { |
| 548 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 549 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 550 | struct md5_state md5state; |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 551 | __le32 buf[4]; |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 552 | int i, r; |
| 553 | |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 554 | desc->tfm = lmk->hash_tfm; |
| 555 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 556 | |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 557 | r = crypto_shash_init(desc); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 558 | if (r) |
| 559 | return r; |
| 560 | |
| 561 | if (lmk->seed) { |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 562 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 563 | if (r) |
| 564 | return r; |
| 565 | } |
| 566 | |
| 567 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 568 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 569 | if (r) |
| 570 | return r; |
| 571 | |
| 572 | /* Sector is cropped to 56 bits here */ |
| 573 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); |
| 574 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); |
| 575 | buf[2] = cpu_to_le32(4024); |
| 576 | buf[3] = 0; |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 577 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 578 | if (r) |
| 579 | return r; |
| 580 | |
| 581 | /* No MD5 padding here */ |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 582 | r = crypto_shash_export(desc, &md5state); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 583 | if (r) |
| 584 | return r; |
| 585 | |
| 586 | for (i = 0; i < MD5_HASH_WORDS; i++) |
| 587 | __cpu_to_le32s(&md5state.hash[i]); |
| 588 | memcpy(iv, &md5state.hash, cc->iv_size); |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, |
| 594 | struct dm_crypt_request *dmreq) |
| 595 | { |
| 596 | u8 *src; |
| 597 | int r = 0; |
| 598 | |
| 599 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { |
Cong Wang | c2e022c | 2011-11-28 13:26:02 +0800 | [diff] [blame] | 600 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 601 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
Cong Wang | c2e022c | 2011-11-28 13:26:02 +0800 | [diff] [blame] | 602 | kunmap_atomic(src); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 603 | } else |
| 604 | memset(iv, 0, cc->iv_size); |
| 605 | |
| 606 | return r; |
| 607 | } |
| 608 | |
| 609 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, |
| 610 | struct dm_crypt_request *dmreq) |
| 611 | { |
| 612 | u8 *dst; |
| 613 | int r; |
| 614 | |
| 615 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) |
| 616 | return 0; |
| 617 | |
Cong Wang | c2e022c | 2011-11-28 13:26:02 +0800 | [diff] [blame] | 618 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 619 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
| 620 | |
| 621 | /* Tweak the first block of plaintext sector */ |
| 622 | if (!r) |
| 623 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); |
| 624 | |
Cong Wang | c2e022c | 2011-11-28 13:26:02 +0800 | [diff] [blame] | 625 | kunmap_atomic(dst); |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 626 | return r; |
| 627 | } |
| 628 | |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 629 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
| 630 | { |
| 631 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
| 632 | |
| 633 | kzfree(tcw->iv_seed); |
| 634 | tcw->iv_seed = NULL; |
| 635 | kzfree(tcw->whitening); |
| 636 | tcw->whitening = NULL; |
| 637 | |
| 638 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) |
| 639 | crypto_free_shash(tcw->crc32_tfm); |
| 640 | tcw->crc32_tfm = NULL; |
| 641 | } |
| 642 | |
| 643 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 644 | const char *opts) |
| 645 | { |
| 646 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
| 647 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 648 | if (cc->sector_size != (1 << SECTOR_SHIFT)) { |
| 649 | ti->error = "Unsupported sector size for TCW"; |
| 650 | return -EINVAL; |
| 651 | } |
| 652 | |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 653 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { |
| 654 | ti->error = "Wrong key size for TCW"; |
| 655 | return -EINVAL; |
| 656 | } |
| 657 | |
| 658 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); |
| 659 | if (IS_ERR(tcw->crc32_tfm)) { |
| 660 | ti->error = "Error initializing CRC32 in TCW"; |
| 661 | return PTR_ERR(tcw->crc32_tfm); |
| 662 | } |
| 663 | |
| 664 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); |
| 665 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); |
| 666 | if (!tcw->iv_seed || !tcw->whitening) { |
| 667 | crypt_iv_tcw_dtr(cc); |
| 668 | ti->error = "Error allocating seed storage in TCW"; |
| 669 | return -ENOMEM; |
| 670 | } |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static int crypt_iv_tcw_init(struct crypt_config *cc) |
| 676 | { |
| 677 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
| 678 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; |
| 679 | |
| 680 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); |
| 681 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], |
| 682 | TCW_WHITENING_SIZE); |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) |
| 688 | { |
| 689 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
| 690 | |
| 691 | memset(tcw->iv_seed, 0, cc->iv_size); |
| 692 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); |
| 693 | |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, |
| 698 | struct dm_crypt_request *dmreq, |
| 699 | u8 *data) |
| 700 | { |
| 701 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
Bart Van Assche | 350b539 | 2016-06-28 16:32:32 +0200 | [diff] [blame] | 702 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 703 | u8 buf[TCW_WHITENING_SIZE]; |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 704 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 705 | int i, r; |
| 706 | |
| 707 | /* xor whitening with sector number */ |
| 708 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); |
| 709 | crypto_xor(buf, (u8 *)§or, 8); |
| 710 | crypto_xor(&buf[8], (u8 *)§or, 8); |
| 711 | |
| 712 | /* calculate crc32 for every 32bit part and xor it */ |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 713 | desc->tfm = tcw->crc32_tfm; |
| 714 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 715 | for (i = 0; i < 4; i++) { |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 716 | r = crypto_shash_init(desc); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 717 | if (r) |
| 718 | goto out; |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 719 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 720 | if (r) |
| 721 | goto out; |
Jan-Simon Möller | b610626 | 2012-07-02 13:50:54 +0200 | [diff] [blame] | 722 | r = crypto_shash_final(desc, &buf[i * 4]); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 723 | if (r) |
| 724 | goto out; |
| 725 | } |
| 726 | crypto_xor(&buf[0], &buf[12], 4); |
| 727 | crypto_xor(&buf[4], &buf[8], 4); |
| 728 | |
| 729 | /* apply whitening (8 bytes) to whole sector */ |
| 730 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) |
| 731 | crypto_xor(data + i * 8, buf, 8); |
| 732 | out: |
Milan Broz | 1a71d6f | 2014-11-22 09:36:04 +0100 | [diff] [blame] | 733 | memzero_explicit(buf, sizeof(buf)); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 734 | return r; |
| 735 | } |
| 736 | |
| 737 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, |
| 738 | struct dm_crypt_request *dmreq) |
| 739 | { |
| 740 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; |
Bart Van Assche | 350b539 | 2016-06-28 16:32:32 +0200 | [diff] [blame] | 741 | __le64 sector = cpu_to_le64(dmreq->iv_sector); |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 742 | u8 *src; |
| 743 | int r = 0; |
| 744 | |
| 745 | /* Remove whitening from ciphertext */ |
| 746 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { |
| 747 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
| 748 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); |
| 749 | kunmap_atomic(src); |
| 750 | } |
| 751 | |
| 752 | /* Calculate IV */ |
| 753 | memcpy(iv, tcw->iv_seed, cc->iv_size); |
| 754 | crypto_xor(iv, (u8 *)§or, 8); |
| 755 | if (cc->iv_size > 8) |
| 756 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); |
| 757 | |
| 758 | return r; |
| 759 | } |
| 760 | |
| 761 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, |
| 762 | struct dm_crypt_request *dmreq) |
| 763 | { |
| 764 | u8 *dst; |
| 765 | int r; |
| 766 | |
| 767 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) |
| 768 | return 0; |
| 769 | |
| 770 | /* Apply whitening on ciphertext */ |
| 771 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
| 772 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); |
| 773 | kunmap_atomic(dst); |
| 774 | |
| 775 | return r; |
| 776 | } |
| 777 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
| 779 | .generator = crypt_iv_plain_gen |
| 780 | }; |
| 781 | |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 782 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
| 783 | .generator = crypt_iv_plain64_gen |
| 784 | }; |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
| 787 | .ctr = crypt_iv_essiv_ctr, |
| 788 | .dtr = crypt_iv_essiv_dtr, |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 789 | .init = crypt_iv_essiv_init, |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 790 | .wipe = crypt_iv_essiv_wipe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | .generator = crypt_iv_essiv_gen |
| 792 | }; |
| 793 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 794 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
| 795 | .ctr = crypt_iv_benbi_ctr, |
| 796 | .dtr = crypt_iv_benbi_dtr, |
| 797 | .generator = crypt_iv_benbi_gen |
| 798 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 800 | static struct crypt_iv_operations crypt_iv_null_ops = { |
| 801 | .generator = crypt_iv_null_gen |
| 802 | }; |
| 803 | |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 804 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
| 805 | .ctr = crypt_iv_lmk_ctr, |
| 806 | .dtr = crypt_iv_lmk_dtr, |
| 807 | .init = crypt_iv_lmk_init, |
| 808 | .wipe = crypt_iv_lmk_wipe, |
| 809 | .generator = crypt_iv_lmk_gen, |
| 810 | .post = crypt_iv_lmk_post |
| 811 | }; |
| 812 | |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 813 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
| 814 | .ctr = crypt_iv_tcw_ctr, |
| 815 | .dtr = crypt_iv_tcw_dtr, |
| 816 | .init = crypt_iv_tcw_init, |
| 817 | .wipe = crypt_iv_tcw_wipe, |
| 818 | .generator = crypt_iv_tcw_gen, |
| 819 | .post = crypt_iv_tcw_post |
| 820 | }; |
| 821 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 822 | static void crypt_convert_init(struct crypt_config *cc, |
| 823 | struct convert_context *ctx, |
| 824 | struct bio *bio_out, struct bio *bio_in, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 825 | sector_t sector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
| 827 | ctx->bio_in = bio_in; |
| 828 | ctx->bio_out = bio_out; |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 829 | if (bio_in) |
| 830 | ctx->iter_in = bio_in->bi_iter; |
| 831 | if (bio_out) |
| 832 | ctx->iter_out = bio_out->bi_iter; |
Mikulas Patocka | c66029f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 833 | ctx->cc_sector = sector + cc->iv_offset; |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 834 | init_completion(&ctx->restart); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 837 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 838 | struct skcipher_request *req) |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 839 | { |
| 840 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); |
| 841 | } |
| 842 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 843 | static struct skcipher_request *req_of_dmreq(struct crypt_config *cc, |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 844 | struct dm_crypt_request *dmreq) |
| 845 | { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 846 | return (struct skcipher_request *)((char *)dmreq - cc->dmreq_start); |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 847 | } |
| 848 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 849 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
| 850 | struct dm_crypt_request *dmreq) |
| 851 | { |
| 852 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 853 | crypto_skcipher_alignmask(any_tfm(cc)) + 1); |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 854 | } |
| 855 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 856 | static int crypt_convert_block(struct crypt_config *cc, |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 857 | struct convert_context *ctx, |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 858 | struct skcipher_request *req) |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 859 | { |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 860 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
| 861 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 862 | struct dm_crypt_request *dmreq; |
| 863 | u8 *iv; |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 864 | int r; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 865 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 866 | /* Reject unexpected unaligned bio. */ |
Mikulas Patocka | 946db24 | 2017-11-07 10:35:57 -0500 | [diff] [blame] | 867 | if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 868 | return -EIO; |
| 869 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 870 | dmreq = dmreq_of_req(cc, req); |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 871 | iv = iv_of_dmreq(cc, dmreq); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 872 | |
Mikulas Patocka | c66029f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 873 | dmreq->iv_sector = ctx->cc_sector; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 874 | if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 875 | dmreq->iv_sector >>= cc->sector_shift; |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 876 | dmreq->ctx = ctx; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 877 | sg_init_table(&dmreq->sg_in, 1); |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 878 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, cc->sector_size, |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 879 | bv_in.bv_offset); |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 880 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 881 | sg_init_table(&dmreq->sg_out, 1); |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 882 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, cc->sector_size, |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 883 | bv_out.bv_offset); |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 884 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 885 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); |
| 886 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 887 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 888 | if (cc->iv_gen_ops) { |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 889 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 890 | if (r < 0) |
| 891 | return r; |
| 892 | } |
| 893 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 894 | skcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 895 | cc->sector_size, iv); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 896 | |
| 897 | if (bio_data_dir(ctx->bio_in) == WRITE) |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 898 | r = crypto_skcipher_encrypt(req); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 899 | else |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 900 | r = crypto_skcipher_decrypt(req); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 901 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 902 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
| 903 | r = cc->iv_gen_ops->post(cc, iv, dmreq); |
| 904 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 905 | return r; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 906 | } |
| 907 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 908 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 909 | int error); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 910 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 911 | static void crypt_alloc_req(struct crypt_config *cc, |
| 912 | struct convert_context *ctx) |
| 913 | { |
Mikulas Patocka | c66029f | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 914 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 915 | |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 916 | if (!ctx->req) |
| 917 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 918 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 919 | skcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 920 | |
| 921 | /* |
| 922 | * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs |
| 923 | * requests if driver request queue is full. |
| 924 | */ |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 925 | skcipher_request_set_callback(ctx->req, |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 926 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 927 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 928 | } |
| 929 | |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 930 | static void crypt_free_req(struct crypt_config *cc, |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 931 | struct skcipher_request *req, struct bio *base_bio) |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 932 | { |
| 933 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); |
| 934 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 935 | if ((struct skcipher_request *)(io + 1) != req) |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 936 | mempool_free(req, cc->req_pool); |
| 937 | } |
| 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | /* |
| 940 | * Encrypt / decrypt data from one bio to another one (can be the same one) |
| 941 | */ |
| 942 | static int crypt_convert(struct crypt_config *cc, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 943 | struct convert_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | { |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 945 | unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 946 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 948 | atomic_set(&ctx->cc_pending, 1); |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 949 | |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 950 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 952 | crypt_alloc_req(cc, ctx); |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 953 | atomic_inc(&ctx->cc_pending); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 954 | |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 955 | r = crypt_convert_block(cc, ctx, ctx->req); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 956 | |
| 957 | switch (r) { |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 958 | /* |
| 959 | * The request was queued by a crypto driver |
| 960 | * but the driver request queue is full, let's wait. |
| 961 | */ |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 962 | case -EBUSY: |
| 963 | wait_for_completion(&ctx->restart); |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 964 | reinit_completion(&ctx->restart); |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 965 | /* fall through */ |
| 966 | /* |
| 967 | * The request is queued and processed asynchronously, |
| 968 | * completion function kcryptd_async_done() will be called. |
| 969 | */ |
Rabin Vincent | c0403ec | 2015-05-05 15:15:56 +0200 | [diff] [blame] | 970 | case -EINPROGRESS: |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 971 | ctx->req = NULL; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 972 | ctx->cc_sector += sector_step; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 973 | continue; |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 974 | /* |
| 975 | * The request was already processed (synchronously). |
| 976 | */ |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 977 | case 0: |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 978 | atomic_dec(&ctx->cc_pending); |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 979 | ctx->cc_sector += sector_step; |
Milan Broz | c7f1b20 | 2008-07-02 09:34:28 +0100 | [diff] [blame] | 980 | cond_resched(); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 981 | continue; |
| 982 | |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 983 | /* There was an error while processing the request. */ |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 984 | default: |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 985 | atomic_dec(&ctx->cc_pending); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 986 | return r; |
| 987 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | } |
| 989 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 990 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | } |
| 992 | |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 993 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
| 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | /* |
| 996 | * Generate a new unfragmented bio with the given size |
Mike Snitzer | 586b286 | 2015-09-09 21:34:51 -0400 | [diff] [blame] | 997 | * This should never violate the device limitations (but only because |
| 998 | * max_segment_size is being constrained to PAGE_SIZE). |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 999 | * |
| 1000 | * This function may be called concurrently. If we allocate from the mempool |
| 1001 | * concurrently, there is a possibility of deadlock. For example, if we have |
| 1002 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from |
| 1003 | * the mempool concurrently, it may deadlock in a situation where both processes |
| 1004 | * have allocated 128 pages and the mempool is exhausted. |
| 1005 | * |
| 1006 | * In order to avoid this scenario we allocate the pages under a mutex. |
| 1007 | * |
| 1008 | * In order to not degrade performance with excessive locking, we try |
| 1009 | * non-blocking allocations without a mutex first but on failure we fallback |
| 1010 | * to blocking allocations with a mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | */ |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1012 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1014 | struct crypt_config *cc = io->cc; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1015 | struct bio *clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1017 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
| 1018 | unsigned i, len, remaining_size; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 1019 | struct page *page; |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1020 | struct bio_vec *bvec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1022 | retry: |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1023 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1024 | mutex_lock(&cc->bio_alloc_lock); |
| 1025 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 1026 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1027 | if (!clone) |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1028 | goto return_clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 1030 | clone_init(io, clone); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1031 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1032 | remaining_size = size; |
| 1033 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 1034 | for (i = 0; i < nr_iovecs; i++) { |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 1035 | page = mempool_alloc(cc->page_pool, gfp_mask); |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1036 | if (!page) { |
| 1037 | crypt_free_buffer_pages(cc, clone); |
| 1038 | bio_put(clone); |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1039 | gfp_mask |= __GFP_DIRECT_RECLAIM; |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1040 | goto retry; |
| 1041 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1043 | len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1045 | bvec = &clone->bi_io_vec[clone->bi_vcnt++]; |
| 1046 | bvec->bv_page = page; |
| 1047 | bvec->bv_len = len; |
| 1048 | bvec->bv_offset = 0; |
| 1049 | |
| 1050 | clone->bi_iter.bi_size += len; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 1051 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1052 | remaining_size -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1055 | return_clone: |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1056 | if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1057 | mutex_unlock(&cc->bio_alloc_lock); |
| 1058 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1059 | return clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | } |
| 1061 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 1062 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 1064 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | struct bio_vec *bv; |
| 1066 | |
Kent Overstreet | cb34e05 | 2012-09-05 15:22:02 -0700 | [diff] [blame] | 1067 | bio_for_each_segment_all(bv, clone, i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | BUG_ON(!bv->bv_page); |
| 1069 | mempool_free(bv->bv_page, cc->page_pool); |
| 1070 | bv->bv_page = NULL; |
| 1071 | } |
| 1072 | } |
| 1073 | |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 1074 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
| 1075 | struct bio *bio, sector_t sector) |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 1076 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1077 | io->cc = cc; |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 1078 | io->base_bio = bio; |
| 1079 | io->sector = sector; |
| 1080 | io->error = 0; |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 1081 | io->ctx.req = NULL; |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 1082 | atomic_set(&io->io_pending, 0); |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 1083 | } |
| 1084 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 1085 | static void crypt_inc_pending(struct dm_crypt_io *io) |
| 1086 | { |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 1087 | atomic_inc(&io->io_pending); |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 1088 | } |
| 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | /* |
| 1091 | * One of the bios was finished. Check for completion of |
| 1092 | * the whole request and correctly clean up the buffer. |
| 1093 | */ |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1094 | static void crypt_dec_pending(struct dm_crypt_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1096 | struct crypt_config *cc = io->cc; |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 1097 | struct bio *base_bio = io->base_bio; |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 1098 | int error = io->error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 1100 | if (!atomic_dec_and_test(&io->io_pending)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | return; |
| 1102 | |
Mikulas Patocka | 610f2de | 2014-02-20 18:01:01 -0500 | [diff] [blame] | 1103 | if (io->ctx.req) |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 1104 | crypt_free_req(cc, io->ctx.req, base_bio); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 1105 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1106 | base_bio->bi_error = error; |
| 1107 | bio_endio(base_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | } |
| 1109 | |
| 1110 | /* |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1111 | * kcryptd/kcryptd_io: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | * |
| 1113 | * Needed because it would be very unwise to do decryption in an |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 1114 | * interrupt context. |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1115 | * |
| 1116 | * kcryptd performs the actual encryption or decryption. |
| 1117 | * |
| 1118 | * kcryptd_io performs the IO submission. |
| 1119 | * |
| 1120 | * They must be separated as otherwise the final stages could be |
| 1121 | * starved by new requests which can block in the first stages due |
| 1122 | * to memory allocation. |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1123 | * |
| 1124 | * The work is done per CPU global for all dm-crypt instances. |
| 1125 | * They should not depend on each other and do not block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1127 | static void crypt_endio(struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1128 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1129 | struct dm_crypt_io *io = clone->bi_private; |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1130 | struct crypt_config *cc = io->cc; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 1131 | unsigned rw = bio_data_dir(clone); |
Sasha Levin | 9b81c84 | 2015-08-10 19:05:18 -0400 | [diff] [blame] | 1132 | int error; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1133 | |
| 1134 | /* |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1135 | * free the processed pages |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1136 | */ |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 1137 | if (rw == WRITE) |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 1138 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 1139 | |
Sasha Levin | 9b81c84 | 2015-08-10 19:05:18 -0400 | [diff] [blame] | 1140 | error = clone->bi_error; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 1141 | bio_put(clone); |
| 1142 | |
Sasha Levin | 9b81c84 | 2015-08-10 19:05:18 -0400 | [diff] [blame] | 1143 | if (rw == READ && !error) { |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 1144 | kcryptd_queue_crypt(io); |
| 1145 | return; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1146 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1147 | |
Sasha Levin | 9b81c84 | 2015-08-10 19:05:18 -0400 | [diff] [blame] | 1148 | if (unlikely(error)) |
| 1149 | io->error = error; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1150 | |
| 1151 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1154 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1155 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1156 | struct crypt_config *cc = io->cc; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1157 | |
| 1158 | clone->bi_private = io; |
| 1159 | clone->bi_end_io = crypt_endio; |
| 1160 | clone->bi_bdev = cc->dev->bdev; |
Bart Van Assche | 4382e33 | 2016-09-14 10:45:36 +0200 | [diff] [blame] | 1161 | bio_set_op_attrs(clone, bio_op(io->base_bio), bio_flags(io->base_bio)); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1162 | } |
| 1163 | |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1164 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1165 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1166 | struct crypt_config *cc = io->cc; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1167 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 1168 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1169 | /* |
Mike Snitzer | 5977907 | 2015-04-09 16:53:24 -0400 | [diff] [blame] | 1170 | * We need the original biovec array in order to decrypt |
| 1171 | * the whole bio data *afterwards* -- thanks to immutable |
| 1172 | * biovecs we don't need to worry about the block layer |
| 1173 | * modifying the biovec array; so leverage bio_clone_fast(). |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1174 | */ |
Mike Snitzer | 5977907 | 2015-04-09 16:53:24 -0400 | [diff] [blame] | 1175 | clone = bio_clone_fast(io->base_bio, gfp, cc->bs); |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 1176 | if (!clone) |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1177 | return 1; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1178 | |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1179 | crypt_inc_pending(io); |
| 1180 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1181 | clone_init(io, clone); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1182 | clone->bi_iter.bi_sector = cc->start + io->sector; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1183 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 1184 | generic_make_request(clone); |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1185 | return 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1186 | } |
| 1187 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1188 | static void kcryptd_io_read_work(struct work_struct *work) |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1189 | { |
| 1190 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 1191 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1192 | crypt_inc_pending(io); |
| 1193 | if (kcryptd_io_read(io, GFP_NOIO)) |
| 1194 | io->error = -ENOMEM; |
| 1195 | crypt_dec_pending(io); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1196 | } |
| 1197 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1198 | static void kcryptd_queue_read(struct dm_crypt_io *io) |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1199 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1200 | struct crypt_config *cc = io->cc; |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1201 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1202 | INIT_WORK(&io->work, kcryptd_io_read_work); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1203 | queue_work(cc->io_queue, &io->work); |
| 1204 | } |
| 1205 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1206 | static void kcryptd_io_write(struct dm_crypt_io *io) |
| 1207 | { |
| 1208 | struct bio *clone = io->ctx.bio_out; |
| 1209 | |
| 1210 | generic_make_request(clone); |
| 1211 | } |
| 1212 | |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1213 | #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) |
| 1214 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1215 | static int dmcrypt_write(void *data) |
| 1216 | { |
| 1217 | struct crypt_config *cc = data; |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1218 | struct dm_crypt_io *io; |
| 1219 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1220 | while (1) { |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1221 | struct rb_root write_tree; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1222 | struct blk_plug plug; |
| 1223 | |
| 1224 | DECLARE_WAITQUEUE(wait, current); |
| 1225 | |
| 1226 | spin_lock_irq(&cc->write_thread_wait.lock); |
| 1227 | continue_locked: |
| 1228 | |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1229 | if (!RB_EMPTY_ROOT(&cc->write_tree)) |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1230 | goto pop_from_list; |
| 1231 | |
Rabin Vincent | f659b10 | 2016-09-21 16:22:29 +0200 | [diff] [blame] | 1232 | set_current_state(TASK_INTERRUPTIBLE); |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1233 | __add_wait_queue(&cc->write_thread_wait, &wait); |
| 1234 | |
| 1235 | spin_unlock_irq(&cc->write_thread_wait.lock); |
| 1236 | |
Rabin Vincent | f659b10 | 2016-09-21 16:22:29 +0200 | [diff] [blame] | 1237 | if (unlikely(kthread_should_stop())) { |
| 1238 | set_task_state(current, TASK_RUNNING); |
| 1239 | remove_wait_queue(&cc->write_thread_wait, &wait); |
| 1240 | break; |
| 1241 | } |
| 1242 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1243 | schedule(); |
| 1244 | |
Rabin Vincent | f659b10 | 2016-09-21 16:22:29 +0200 | [diff] [blame] | 1245 | set_task_state(current, TASK_RUNNING); |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1246 | spin_lock_irq(&cc->write_thread_wait.lock); |
| 1247 | __remove_wait_queue(&cc->write_thread_wait, &wait); |
| 1248 | goto continue_locked; |
| 1249 | |
| 1250 | pop_from_list: |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1251 | write_tree = cc->write_tree; |
| 1252 | cc->write_tree = RB_ROOT; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1253 | spin_unlock_irq(&cc->write_thread_wait.lock); |
| 1254 | |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1255 | BUG_ON(rb_parent(write_tree.rb_node)); |
| 1256 | |
| 1257 | /* |
| 1258 | * Note: we cannot walk the tree here with rb_next because |
| 1259 | * the structures may be freed when kcryptd_io_write is called. |
| 1260 | */ |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1261 | blk_start_plug(&plug); |
| 1262 | do { |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1263 | io = crypt_io_from_node(rb_first(&write_tree)); |
| 1264 | rb_erase(&io->rb_node, &write_tree); |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1265 | kcryptd_io_write(io); |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1266 | } while (!RB_EMPTY_ROOT(&write_tree)); |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1267 | blk_finish_plug(&plug); |
| 1268 | } |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1272 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 1273 | { |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1274 | struct bio *clone = io->ctx.bio_out; |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1275 | struct crypt_config *cc = io->cc; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1276 | unsigned long flags; |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1277 | sector_t sector; |
| 1278 | struct rb_node **rbp, *parent; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1279 | |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1280 | if (unlikely(io->error < 0)) { |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1281 | crypt_free_buffer_pages(cc, clone); |
| 1282 | bio_put(clone); |
Milan Broz | 6c031f4 | 2008-10-10 13:37:06 +0100 | [diff] [blame] | 1283 | crypt_dec_pending(io); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1284 | return; |
| 1285 | } |
| 1286 | |
| 1287 | /* crypt_convert should have filled the clone bio */ |
Kent Overstreet | 003b5c5 | 2013-10-11 15:45:43 -0700 | [diff] [blame] | 1288 | BUG_ON(io->ctx.iter_out.bi_size); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1289 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1290 | clone->bi_iter.bi_sector = cc->start + io->sector; |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 1291 | |
Mikulas Patocka | 0f5d8e6 | 2015-02-13 08:27:08 -0500 | [diff] [blame] | 1292 | if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { |
| 1293 | generic_make_request(clone); |
| 1294 | return; |
| 1295 | } |
| 1296 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1297 | spin_lock_irqsave(&cc->write_thread_wait.lock, flags); |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1298 | rbp = &cc->write_tree.rb_node; |
| 1299 | parent = NULL; |
| 1300 | sector = io->sector; |
| 1301 | while (*rbp) { |
| 1302 | parent = *rbp; |
| 1303 | if (sector < crypt_io_from_node(parent)->sector) |
| 1304 | rbp = &(*rbp)->rb_left; |
| 1305 | else |
| 1306 | rbp = &(*rbp)->rb_right; |
| 1307 | } |
| 1308 | rb_link_node(&io->rb_node, parent, rbp); |
| 1309 | rb_insert_color(&io->rb_node, &cc->write_tree); |
| 1310 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1311 | wake_up_locked(&cc->write_thread_wait); |
| 1312 | spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 1313 | } |
| 1314 | |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 1315 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1316 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1317 | struct crypt_config *cc = io->cc; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1318 | struct bio *clone; |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 1319 | int crypt_finished; |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 1320 | sector_t sector = io->sector; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 1321 | int r; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1322 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 1323 | /* |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 1324 | * Prevent io from disappearing until this function completes. |
| 1325 | */ |
| 1326 | crypt_inc_pending(io); |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 1327 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 1328 | |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1329 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
| 1330 | if (unlikely(!clone)) { |
| 1331 | io->error = -EIO; |
| 1332 | goto dec; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1333 | } |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 1334 | |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1335 | io->ctx.bio_out = clone; |
| 1336 | io->ctx.iter_out = clone->bi_iter; |
| 1337 | |
| 1338 | sector += bio_sectors(clone); |
| 1339 | |
| 1340 | crypt_inc_pending(io); |
| 1341 | r = crypt_convert(cc, &io->ctx); |
| 1342 | if (r) |
| 1343 | io->error = -EIO; |
| 1344 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
| 1345 | |
| 1346 | /* Encryption was already finished, submit io now */ |
| 1347 | if (crypt_finished) { |
| 1348 | kcryptd_crypt_write_io_submit(io, 0); |
| 1349 | io->sector = sector; |
| 1350 | } |
| 1351 | |
| 1352 | dec: |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 1353 | crypt_dec_pending(io); |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 1354 | } |
| 1355 | |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1356 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1357 | { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1358 | crypt_dec_pending(io); |
| 1359 | } |
| 1360 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 1361 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1362 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1363 | struct crypt_config *cc = io->cc; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1364 | int r = 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1365 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 1366 | crypt_inc_pending(io); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1367 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 1368 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 1369 | io->sector); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1370 | |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1371 | r = crypt_convert(cc, &io->ctx); |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1372 | if (r < 0) |
| 1373 | io->error = -EIO; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 1374 | |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 1375 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1376 | kcryptd_crypt_read_done(io); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1377 | |
| 1378 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1379 | } |
| 1380 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1381 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 1382 | int error) |
| 1383 | { |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 1384 | struct dm_crypt_request *dmreq = async_req->data; |
| 1385 | struct convert_context *ctx = dmreq->ctx; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1386 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1387 | struct crypt_config *cc = io->cc; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1388 | |
Milan Broz | 54cea3f | 2015-05-15 17:00:25 +0200 | [diff] [blame] | 1389 | /* |
| 1390 | * A request from crypto driver backlog is going to be processed now, |
| 1391 | * finish the completion and continue in crypt_convert(). |
| 1392 | * (Callback will be called for the second time for this request.) |
| 1393 | */ |
Rabin Vincent | c0403ec | 2015-05-05 15:15:56 +0200 | [diff] [blame] | 1394 | if (error == -EINPROGRESS) { |
| 1395 | complete(&ctx->restart); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1396 | return; |
Rabin Vincent | c0403ec | 2015-05-05 15:15:56 +0200 | [diff] [blame] | 1397 | } |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1398 | |
Milan Broz | 2dc5327 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1399 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
| 1400 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); |
| 1401 | |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1402 | if (error < 0) |
| 1403 | io->error = -EIO; |
| 1404 | |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 1405 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1406 | |
Mikulas Patocka | 40b6229 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 1407 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
Rabin Vincent | c0403ec | 2015-05-05 15:15:56 +0200 | [diff] [blame] | 1408 | return; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1409 | |
| 1410 | if (bio_data_dir(io->base_bio) == READ) |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1411 | kcryptd_crypt_read_done(io); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1412 | else |
Mikulas Patocka | 72c6e7a | 2012-03-28 18:41:22 +0100 | [diff] [blame] | 1413 | kcryptd_crypt_write_io_submit(io, 1); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 1414 | } |
| 1415 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 1416 | static void kcryptd_crypt(struct work_struct *work) |
| 1417 | { |
| 1418 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 1419 | |
| 1420 | if (bio_data_dir(io->base_bio) == READ) |
| 1421 | kcryptd_crypt_read_convert(io); |
| 1422 | else |
| 1423 | kcryptd_crypt_write_convert(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1424 | } |
| 1425 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1426 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
| 1427 | { |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1428 | struct crypt_config *cc = io->cc; |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 1429 | |
| 1430 | INIT_WORK(&io->work, kcryptd_crypt); |
| 1431 | queue_work(cc->crypt_queue, &io->work); |
| 1432 | } |
| 1433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | /* |
| 1435 | * Decode key from its hex representation |
| 1436 | */ |
| 1437 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) |
| 1438 | { |
| 1439 | char buffer[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | unsigned int i; |
| 1441 | |
| 1442 | buffer[2] = '\0'; |
| 1443 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1444 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | buffer[0] = *hex++; |
| 1446 | buffer[1] = *hex++; |
| 1447 | |
majianpeng | 1a66a08 | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 1448 | if (kstrtou8(buffer, 16, &key[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | return -EINVAL; |
| 1450 | } |
| 1451 | |
| 1452 | if (*hex != '\0') |
| 1453 | return -EINVAL; |
| 1454 | |
| 1455 | return 0; |
| 1456 | } |
| 1457 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1458 | static void crypt_free_tfms(struct crypt_config *cc) |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1459 | { |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1460 | unsigned i; |
| 1461 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1462 | if (!cc->tfms) |
| 1463 | return; |
| 1464 | |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1465 | for (i = 0; i < cc->tfms_count; i++) |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1466 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1467 | crypto_free_skcipher(cc->tfms[i]); |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1468 | cc->tfms[i] = NULL; |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1469 | } |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1470 | |
| 1471 | kfree(cc->tfms); |
| 1472 | cc->tfms = NULL; |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1473 | } |
| 1474 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1475 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1476 | { |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1477 | unsigned i; |
| 1478 | int err; |
| 1479 | |
Eric Biggers | 5d0be84 | 2016-08-30 09:51:44 -0700 | [diff] [blame] | 1480 | cc->tfms = kzalloc(cc->tfms_count * sizeof(struct crypto_skcipher *), |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1481 | GFP_KERNEL); |
| 1482 | if (!cc->tfms) |
| 1483 | return -ENOMEM; |
| 1484 | |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1485 | for (i = 0; i < cc->tfms_count; i++) { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1486 | cc->tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1487 | if (IS_ERR(cc->tfms[i])) { |
| 1488 | err = PTR_ERR(cc->tfms[i]); |
| 1489 | crypt_free_tfms(cc); |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1490 | return err; |
| 1491 | } |
| 1492 | } |
| 1493 | |
Eric Biggers | 1cae07e | 2018-12-05 20:53:00 -0800 | [diff] [blame] | 1494 | /* |
| 1495 | * dm-crypt performance can vary greatly depending on which crypto |
| 1496 | * algorithm implementation is used. Help people debug performance |
| 1497 | * problems by logging the ->cra_driver_name. |
| 1498 | */ |
| 1499 | DMINFO("%s using implementation \"%s\"", ciphermode, |
| 1500 | crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1501 | return 0; |
| 1502 | } |
| 1503 | |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1504 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
| 1505 | { |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1506 | unsigned subkey_size; |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1507 | int err = 0, i, r; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1508 | |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1509 | /* Ignore extra keys (which are used for IV etc) */ |
| 1510 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); |
| 1511 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1512 | for (i = 0; i < cc->tfms_count; i++) { |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1513 | r = crypto_skcipher_setkey(cc->tfms[i], |
| 1514 | cc->key + (i * subkey_size), |
| 1515 | subkey_size); |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1516 | if (r) |
| 1517 | err = r; |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1518 | } |
| 1519 | |
| 1520 | return err; |
| 1521 | } |
| 1522 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1523 | static int crypt_set_key(struct crypt_config *cc, char *key) |
| 1524 | { |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1525 | int r = -EINVAL; |
| 1526 | int key_string_len = strlen(key); |
| 1527 | |
Milan Broz | 69a8cfc | 2011-01-13 19:59:49 +0000 | [diff] [blame] | 1528 | /* The key size may not be changed. */ |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1529 | if (cc->key_size != (key_string_len >> 1)) |
| 1530 | goto out; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1531 | |
Milan Broz | 69a8cfc | 2011-01-13 19:59:49 +0000 | [diff] [blame] | 1532 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
| 1533 | if (!cc->key_size && strcmp(key, "-")) |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1534 | goto out; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1535 | |
Ondrej Kozina | 2c017f7 | 2016-11-02 15:02:08 +0100 | [diff] [blame] | 1536 | /* clear the flag since following operations may invalidate previously valid key */ |
| 1537 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 1538 | |
Milan Broz | 69a8cfc | 2011-01-13 19:59:49 +0000 | [diff] [blame] | 1539 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1540 | goto out; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1541 | |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1542 | r = crypt_setkey_allcpus(cc); |
Ondrej Kozina | 2c017f7 | 2016-11-02 15:02:08 +0100 | [diff] [blame] | 1543 | if (!r) |
| 1544 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
Milan Broz | de8be5a | 2011-03-24 13:54:27 +0000 | [diff] [blame] | 1545 | |
| 1546 | out: |
| 1547 | /* Hex key string not needed after here, so wipe it. */ |
| 1548 | memset(key, '0', key_string_len); |
| 1549 | |
| 1550 | return r; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1551 | } |
| 1552 | |
| 1553 | static int crypt_wipe_key(struct crypt_config *cc) |
| 1554 | { |
| 1555 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 1556 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
Andi Kleen | c029772 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 1557 | |
| 1558 | return crypt_setkey_allcpus(cc); |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1559 | } |
| 1560 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1561 | static void crypt_dtr(struct dm_target *ti) |
| 1562 | { |
| 1563 | struct crypt_config *cc = ti->private; |
| 1564 | |
| 1565 | ti->private = NULL; |
| 1566 | |
| 1567 | if (!cc) |
| 1568 | return; |
| 1569 | |
Rabin Vincent | f659b10 | 2016-09-21 16:22:29 +0200 | [diff] [blame] | 1570 | if (cc->write_thread) |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1571 | kthread_stop(cc->write_thread); |
| 1572 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1573 | if (cc->io_queue) |
| 1574 | destroy_workqueue(cc->io_queue); |
| 1575 | if (cc->crypt_queue) |
| 1576 | destroy_workqueue(cc->crypt_queue); |
| 1577 | |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1578 | crypt_free_tfms(cc); |
| 1579 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1580 | if (cc->bs) |
| 1581 | bioset_free(cc->bs); |
| 1582 | |
Julia Lawall | 6f65985 | 2015-09-13 14:15:05 +0200 | [diff] [blame] | 1583 | mempool_destroy(cc->page_pool); |
| 1584 | mempool_destroy(cc->req_pool); |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1585 | |
| 1586 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1587 | cc->iv_gen_ops->dtr(cc); |
| 1588 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1589 | if (cc->dev) |
| 1590 | dm_put_device(ti, cc->dev); |
| 1591 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1592 | kzfree(cc->cipher); |
Milan Broz | 7dbcd13 | 2011-01-13 19:59:52 +0000 | [diff] [blame] | 1593 | kzfree(cc->cipher_string); |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1594 | |
| 1595 | /* Must zero key material before freeing */ |
| 1596 | kzfree(cc); |
| 1597 | } |
| 1598 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1599 | static int crypt_ctr_cipher(struct dm_target *ti, |
| 1600 | char *cipher_in, char *key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | { |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1602 | struct crypt_config *cc = ti->private; |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1603 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1604 | char *cipher_api = NULL; |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1605 | int ret = -EINVAL; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1606 | char dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1608 | /* Convert to crypto api definition? */ |
| 1609 | if (strchr(cipher_in, '(')) { |
| 1610 | ti->error = "Bad cipher specification"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | return -EINVAL; |
| 1612 | } |
| 1613 | |
Milan Broz | 7dbcd13 | 2011-01-13 19:59:52 +0000 | [diff] [blame] | 1614 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
| 1615 | if (!cc->cipher_string) |
| 1616 | goto bad_mem; |
| 1617 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1618 | /* |
| 1619 | * Legacy dm-crypt cipher specification |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1620 | * cipher[:keycount]-mode-iv:ivopts |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1621 | */ |
| 1622 | tmp = cipher_in; |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1623 | keycount = strsep(&tmp, "-"); |
| 1624 | cipher = strsep(&keycount, ":"); |
| 1625 | |
| 1626 | if (!keycount) |
| 1627 | cc->tfms_count = 1; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1628 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
Milan Broz | d1f9642 | 2011-01-13 19:59:54 +0000 | [diff] [blame] | 1629 | !is_power_of_2(cc->tfms_count)) { |
| 1630 | ti->error = "Bad cipher key count specification"; |
| 1631 | return -EINVAL; |
| 1632 | } |
| 1633 | cc->key_parts = cc->tfms_count; |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1634 | cc->key_extra_size = 0; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1635 | |
| 1636 | cc->cipher = kstrdup(cipher, GFP_KERNEL); |
| 1637 | if (!cc->cipher) |
| 1638 | goto bad_mem; |
| 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | chainmode = strsep(&tmp, "-"); |
| 1641 | ivopts = strsep(&tmp, "-"); |
| 1642 | ivmode = strsep(&ivopts, ":"); |
| 1643 | |
| 1644 | if (tmp) |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1645 | DMWARN("Ignoring unexpected additional cipher options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | |
Milan Broz | 7dbcd13 | 2011-01-13 19:59:52 +0000 | [diff] [blame] | 1647 | /* |
| 1648 | * For compatibility with the original dm-crypt mapping format, if |
| 1649 | * only the cipher name is supplied, use cbc-plain. |
| 1650 | */ |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1651 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | chainmode = "cbc"; |
| 1653 | ivmode = "plain"; |
| 1654 | } |
| 1655 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1656 | if (strcmp(chainmode, "ecb") && !ivmode) { |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1657 | ti->error = "IV mechanism required"; |
| 1658 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | } |
| 1660 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1661 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
| 1662 | if (!cipher_api) |
| 1663 | goto bad_mem; |
| 1664 | |
| 1665 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, |
| 1666 | "%s(%s)", chainmode, cipher); |
| 1667 | if (ret < 0) { |
| 1668 | kfree(cipher_api); |
| 1669 | goto bad_mem; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1670 | } |
| 1671 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1672 | /* Allocate cipher */ |
Mikulas Patocka | fd2d231 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1673 | ret = crypt_alloc_tfms(cc, cipher_api); |
| 1674 | if (ret < 0) { |
| 1675 | ti->error = "Error allocating crypto tfm"; |
| 1676 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1679 | /* Initialize IV */ |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1680 | cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1681 | if (cc->iv_size) |
| 1682 | /* at least a 64 bit sector number should fit in our buffer */ |
| 1683 | cc->iv_size = max(cc->iv_size, |
| 1684 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
| 1685 | else if (ivmode) { |
| 1686 | DMWARN("Selected cipher does not support IVs"); |
| 1687 | ivmode = NULL; |
| 1688 | } |
| 1689 | |
| 1690 | /* Choose ivmode, see comments at iv code. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | if (ivmode == NULL) |
| 1692 | cc->iv_gen_ops = NULL; |
| 1693 | else if (strcmp(ivmode, "plain") == 0) |
| 1694 | cc->iv_gen_ops = &crypt_iv_plain_ops; |
Milan Broz | 61afef6 | 2009-12-10 23:52:25 +0000 | [diff] [blame] | 1695 | else if (strcmp(ivmode, "plain64") == 0) |
| 1696 | cc->iv_gen_ops = &crypt_iv_plain64_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | else if (strcmp(ivmode, "essiv") == 0) |
| 1698 | cc->iv_gen_ops = &crypt_iv_essiv_ops; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 1699 | else if (strcmp(ivmode, "benbi") == 0) |
| 1700 | cc->iv_gen_ops = &crypt_iv_benbi_ops; |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 1701 | else if (strcmp(ivmode, "null") == 0) |
| 1702 | cc->iv_gen_ops = &crypt_iv_null_ops; |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 1703 | else if (strcmp(ivmode, "lmk") == 0) { |
| 1704 | cc->iv_gen_ops = &crypt_iv_lmk_ops; |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 1705 | /* |
| 1706 | * Version 2 and 3 is recognised according |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 1707 | * to length of provided multi-key string. |
| 1708 | * If present (version 3), last key is used as IV seed. |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 1709 | * All keys (including IV seed) are always the same size. |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 1710 | */ |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1711 | if (cc->key_size % cc->key_parts) { |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 1712 | cc->key_parts++; |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1713 | cc->key_extra_size = cc->key_size / cc->key_parts; |
| 1714 | } |
Milan Broz | ed04d98 | 2013-10-28 23:21:04 +0100 | [diff] [blame] | 1715 | } else if (strcmp(ivmode, "tcw") == 0) { |
| 1716 | cc->iv_gen_ops = &crypt_iv_tcw_ops; |
| 1717 | cc->key_parts += 2; /* IV + whitening */ |
| 1718 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; |
Milan Broz | 3474578 | 2011-01-13 19:59:55 +0000 | [diff] [blame] | 1719 | } else { |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1720 | ret = -EINVAL; |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1721 | ti->error = "Invalid IV mode"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1722 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
Milan Broz | da31a07 | 2013-10-28 23:21:03 +0100 | [diff] [blame] | 1725 | /* Initialize and set key */ |
| 1726 | ret = crypt_set_key(cc, key); |
| 1727 | if (ret < 0) { |
| 1728 | ti->error = "Error decoding and setting key"; |
| 1729 | goto bad; |
| 1730 | } |
| 1731 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1732 | /* Allocate IV */ |
| 1733 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { |
| 1734 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); |
| 1735 | if (ret < 0) { |
| 1736 | ti->error = "Error creating IV"; |
| 1737 | goto bad; |
| 1738 | } |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 1739 | } |
| 1740 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1741 | /* Initialize IV (set keys for ESSIV etc) */ |
| 1742 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { |
| 1743 | ret = cc->iv_gen_ops->init(cc); |
| 1744 | if (ret < 0) { |
| 1745 | ti->error = "Error initialising IV"; |
| 1746 | goto bad; |
| 1747 | } |
| 1748 | } |
| 1749 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1750 | ret = 0; |
| 1751 | bad: |
| 1752 | kfree(cipher_api); |
| 1753 | return ret; |
| 1754 | |
| 1755 | bad_mem: |
| 1756 | ti->error = "Cannot allocate cipher strings"; |
| 1757 | return -ENOMEM; |
| 1758 | } |
| 1759 | |
| 1760 | /* |
| 1761 | * Construct an encryption mapping: |
| 1762 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 1763 | */ |
| 1764 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 1765 | { |
| 1766 | struct crypt_config *cc; |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1767 | unsigned int key_size, opt_params; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1768 | unsigned long long tmpll; |
| 1769 | int ret; |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1770 | size_t iv_size_padding; |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1771 | struct dm_arg_set as; |
| 1772 | const char *opt_string; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1773 | char dummy; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1774 | |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1775 | static struct dm_arg _args[] = { |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1776 | {0, 5, "Invalid number of feature args"}, |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1777 | }; |
| 1778 | |
| 1779 | if (argc < 5) { |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1780 | ti->error = "Not enough arguments"; |
| 1781 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | } |
| 1783 | |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1784 | key_size = strlen(argv[1]) >> 1; |
| 1785 | |
| 1786 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
| 1787 | if (!cc) { |
| 1788 | ti->error = "Cannot allocate encryption context"; |
| 1789 | return -ENOMEM; |
| 1790 | } |
Milan Broz | 69a8cfc | 2011-01-13 19:59:49 +0000 | [diff] [blame] | 1791 | cc->key_size = key_size; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1792 | cc->sector_size = (1 << SECTOR_SHIFT); |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 1793 | cc->sector_shift = 0; |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 1794 | |
| 1795 | ti->private = cc; |
| 1796 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); |
| 1797 | if (ret < 0) |
| 1798 | goto bad; |
| 1799 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1800 | cc->dmreq_start = sizeof(struct skcipher_request); |
| 1801 | cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1802 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
| 1803 | |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1804 | if (crypto_skcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1805 | /* Allocate the padding exactly */ |
| 1806 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1807 | & crypto_skcipher_alignmask(any_tfm(cc)); |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1808 | } else { |
| 1809 | /* |
| 1810 | * If the cipher requires greater alignment than kmalloc |
| 1811 | * alignment, we don't know the exact position of the |
| 1812 | * initialization vector. We must assume worst case. |
| 1813 | */ |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 1814 | iv_size_padding = crypto_skcipher_alignmask(any_tfm(cc)); |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1815 | } |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1816 | |
Mikulas Patocka | 94f5e02 | 2015-02-13 08:25:26 -0500 | [diff] [blame] | 1817 | ret = -ENOMEM; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1818 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1819 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1820 | if (!cc->req_pool) { |
| 1821 | ti->error = "Cannot allocate crypt request mempool"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1822 | goto bad; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1823 | } |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1824 | |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 1825 | cc->per_bio_data_size = ti->per_io_data_size = |
Mikulas Patocka | d49ec52 | 2014-08-28 11:09:31 -0400 | [diff] [blame] | 1826 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
| 1827 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, |
| 1828 | ARCH_KMALLOC_MINALIGN); |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 1829 | |
Mikulas Patocka | cf2f1ab | 2015-02-13 08:23:52 -0500 | [diff] [blame] | 1830 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | if (!cc->page_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1832 | ti->error = "Cannot allocate page mempool"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1833 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | } |
| 1835 | |
Jens Axboe | bb799ca | 2008-12-10 15:35:05 +0100 | [diff] [blame] | 1836 | cc->bs = bioset_create(MIN_IOS, 0); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1837 | if (!cc->bs) { |
| 1838 | ti->error = "Cannot allocate crypt bioset"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1839 | goto bad; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1840 | } |
| 1841 | |
Mikulas Patocka | 7145c24 | 2015-02-13 08:24:41 -0500 | [diff] [blame] | 1842 | mutex_init(&cc->bio_alloc_lock); |
| 1843 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1844 | ret = -EINVAL; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1845 | if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || |
| 1846 | (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1847 | ti->error = "Invalid iv_offset sector"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1848 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1850 | cc->iv_offset = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | |
Vivek Goyal | e80d1c8 | 2015-07-31 09:20:36 -0400 | [diff] [blame] | 1852 | ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); |
| 1853 | if (ret) { |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1854 | ti->error = "Device lookup failed"; |
| 1855 | goto bad; |
| 1856 | } |
| 1857 | |
Vivek Goyal | e80d1c8 | 2015-07-31 09:20:36 -0400 | [diff] [blame] | 1858 | ret = -EINVAL; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1859 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1860 | ti->error = "Invalid device sector"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1861 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1863 | cc->start = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1865 | argv += 5; |
| 1866 | argc -= 5; |
| 1867 | |
| 1868 | /* Optional parameters */ |
| 1869 | if (argc) { |
| 1870 | as.argc = argc; |
| 1871 | as.argv = argv; |
| 1872 | |
| 1873 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); |
| 1874 | if (ret) |
| 1875 | goto bad; |
| 1876 | |
Wei Yongjun | 44c144f | 2015-04-16 22:00:50 -0400 | [diff] [blame] | 1877 | ret = -EINVAL; |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1878 | while (opt_params--) { |
| 1879 | opt_string = dm_shift_arg(&as); |
| 1880 | if (!opt_string) { |
| 1881 | ti->error = "Not enough feature arguments"; |
| 1882 | goto bad; |
| 1883 | } |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1884 | |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1885 | if (!strcasecmp(opt_string, "allow_discards")) |
| 1886 | ti->num_discard_bios = 1; |
| 1887 | |
| 1888 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) |
| 1889 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); |
| 1890 | |
Mikulas Patocka | 0f5d8e6 | 2015-02-13 08:27:08 -0500 | [diff] [blame] | 1891 | else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) |
| 1892 | set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); |
| 1893 | |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 1894 | else if (sscanf(opt_string, "sector_size:%hu%c", |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1895 | &cc->sector_size, &dummy) == 1) { |
| 1896 | if (cc->sector_size < (1 << SECTOR_SHIFT) || |
| 1897 | cc->sector_size > 4096 || |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 1898 | (cc->sector_size & (cc->sector_size - 1))) { |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1899 | ti->error = "Invalid feature value for sector_size"; |
| 1900 | goto bad; |
| 1901 | } |
Milan Broz | 87e52a4 | 2017-09-13 15:45:56 +0200 | [diff] [blame] | 1902 | if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { |
| 1903 | ti->error = "Device size is not multiple of sector_size feature"; |
| 1904 | goto bad; |
| 1905 | } |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 1906 | cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1907 | } else if (!strcasecmp(opt_string, "iv_large_sectors")) |
| 1908 | set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1909 | else { |
| 1910 | ti->error = "Invalid feature arguments"; |
| 1911 | goto bad; |
| 1912 | } |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1913 | } |
| 1914 | } |
| 1915 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1916 | ret = -ENOMEM; |
Tim Murray | e97c4ed | 2016-01-19 16:33:27 -0800 | [diff] [blame] | 1917 | cc->io_queue = alloc_workqueue("kcryptd_io", |
| 1918 | WQ_HIGHPRI | |
| 1919 | WQ_MEM_RECLAIM, |
| 1920 | 1); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1921 | if (!cc->io_queue) { |
| 1922 | ti->error = "Couldn't create kcryptd io queue"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1923 | goto bad; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1924 | } |
| 1925 | |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1926 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
Tim Murray | e97c4ed | 2016-01-19 16:33:27 -0800 | [diff] [blame] | 1927 | cc->crypt_queue = alloc_workqueue("kcryptd", |
| 1928 | WQ_HIGHPRI | |
| 1929 | WQ_MEM_RECLAIM, 1); |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1930 | else |
Tim Murray | e97c4ed | 2016-01-19 16:33:27 -0800 | [diff] [blame] | 1931 | cc->crypt_queue = alloc_workqueue("kcryptd", |
| 1932 | WQ_HIGHPRI | |
| 1933 | WQ_MEM_RECLAIM | |
| 1934 | WQ_UNBOUND, |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 1935 | num_online_cpus()); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1936 | if (!cc->crypt_queue) { |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1937 | ti->error = "Couldn't create kcryptd queue"; |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1938 | goto bad; |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1939 | } |
| 1940 | |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1941 | init_waitqueue_head(&cc->write_thread_wait); |
Mikulas Patocka | b3c5fd3 | 2015-02-13 08:27:41 -0500 | [diff] [blame] | 1942 | cc->write_tree = RB_ROOT; |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 1943 | |
| 1944 | cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); |
| 1945 | if (IS_ERR(cc->write_thread)) { |
| 1946 | ret = PTR_ERR(cc->write_thread); |
| 1947 | cc->write_thread = NULL; |
| 1948 | ti->error = "Couldn't spawn write thread"; |
| 1949 | goto bad; |
| 1950 | } |
| 1951 | wake_up_process(cc->write_thread); |
| 1952 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1953 | ti->num_flush_bios = 1; |
Alasdair G Kergon | 0ac5548 | 2012-07-27 15:08:08 +0100 | [diff] [blame] | 1954 | ti->discard_zeroes_data_unsupported = true; |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | return 0; |
| 1957 | |
Milan Broz | 28513fc | 2010-08-12 04:14:06 +0100 | [diff] [blame] | 1958 | bad: |
| 1959 | crypt_dtr(ti); |
| 1960 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | } |
| 1962 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1963 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1965 | struct dm_crypt_io *io; |
Alasdair G Kergon | 49a8a92 | 2012-07-27 15:08:05 +0100 | [diff] [blame] | 1966 | struct crypt_config *cc = ti->private; |
Mikulas Patocka | 647c7db | 2009-06-22 10:12:23 +0100 | [diff] [blame] | 1967 | |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1968 | /* |
Mike Christie | 28a8f0d | 2016-06-05 14:32:25 -0500 | [diff] [blame] | 1969 | * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. |
| 1970 | * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 1971 | * - for REQ_OP_DISCARD caller must use flush if IO ordering matters |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1972 | */ |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1973 | if (unlikely(bio->bi_opf & REQ_PREFLUSH || |
Mike Christie | 28a8f0d | 2016-06-05 14:32:25 -0500 | [diff] [blame] | 1974 | bio_op(bio) == REQ_OP_DISCARD)) { |
Mikulas Patocka | 647c7db | 2009-06-22 10:12:23 +0100 | [diff] [blame] | 1975 | bio->bi_bdev = cc->dev->bdev; |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1976 | if (bio_sectors(bio)) |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1977 | bio->bi_iter.bi_sector = cc->start + |
| 1978 | dm_target_offset(ti, bio->bi_iter.bi_sector); |
Mikulas Patocka | 647c7db | 2009-06-22 10:12:23 +0100 | [diff] [blame] | 1979 | return DM_MAPIO_REMAPPED; |
| 1980 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | |
Mikulas Patocka | 4e870e9 | 2016-08-30 16:38:42 -0400 | [diff] [blame] | 1982 | /* |
| 1983 | * Check if bio is too large, split as needed. |
| 1984 | */ |
| 1985 | if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && |
| 1986 | bio_data_dir(bio) == WRITE) |
| 1987 | dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); |
| 1988 | |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 1989 | /* |
| 1990 | * Ensure that bio is a multiple of internal sector encryption size |
| 1991 | * and is aligned to this size as defined in IO hints. |
| 1992 | */ |
| 1993 | if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) |
| 1994 | return -EIO; |
| 1995 | |
| 1996 | if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) |
| 1997 | return -EIO; |
| 1998 | |
Mikulas Patocka | 298a9fa | 2014-03-28 15:51:55 -0400 | [diff] [blame] | 1999 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
| 2000 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); |
Herbert Xu | bbdb23b | 2016-01-24 21:16:36 +0800 | [diff] [blame] | 2001 | io->ctx.req = (struct skcipher_request *)(io + 1); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 2002 | |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 2003 | if (bio_data_dir(io->base_bio) == READ) { |
| 2004 | if (kcryptd_io_read(io, GFP_NOWAIT)) |
Mikulas Patocka | dc26762 | 2015-02-13 08:25:59 -0500 | [diff] [blame] | 2005 | kcryptd_queue_read(io); |
Milan Broz | 20c8253 | 2011-01-13 19:59:53 +0000 | [diff] [blame] | 2006 | } else |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 2007 | kcryptd_queue_crypt(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 2009 | return DM_MAPIO_SUBMITTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | } |
| 2011 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2012 | static void crypt_status(struct dm_target *ti, status_type_t type, |
| 2013 | unsigned status_flags, char *result, unsigned maxlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | { |
Milan Broz | 5ebaee6 | 2010-08-12 04:14:07 +0100 | [diff] [blame] | 2015 | struct crypt_config *cc = ti->private; |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2016 | unsigned i, sz = 0; |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 2017 | int num_feature_args = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | |
| 2019 | switch (type) { |
| 2020 | case STATUSTYPE_INFO: |
| 2021 | result[0] = '\0'; |
| 2022 | break; |
| 2023 | |
| 2024 | case STATUSTYPE_TABLE: |
Milan Broz | 7dbcd13 | 2011-01-13 19:59:52 +0000 | [diff] [blame] | 2025 | DMEMIT("%s ", cc->cipher_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 2027 | if (cc->key_size > 0) |
| 2028 | for (i = 0; i < cc->key_size; i++) |
| 2029 | DMEMIT("%02x", cc->key[i]); |
| 2030 | else |
| 2031 | DMEMIT("-"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 2033 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
| 2034 | cc->dev->name, (unsigned long long)cc->start); |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 2035 | |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 2036 | num_feature_args += !!ti->num_discard_bios; |
| 2037 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); |
Mikulas Patocka | 0f5d8e6 | 2015-02-13 08:27:08 -0500 | [diff] [blame] | 2038 | num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); |
Mikulas Patocka | 52ad0c4 | 2017-03-23 10:23:14 -0400 | [diff] [blame] | 2039 | num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 2040 | num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 2041 | if (num_feature_args) { |
| 2042 | DMEMIT(" %d", num_feature_args); |
| 2043 | if (ti->num_discard_bios) |
| 2044 | DMEMIT(" allow_discards"); |
| 2045 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
| 2046 | DMEMIT(" same_cpu_crypt"); |
Mikulas Patocka | 0f5d8e6 | 2015-02-13 08:27:08 -0500 | [diff] [blame] | 2047 | if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) |
| 2048 | DMEMIT(" submit_from_crypt_cpus"); |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 2049 | if (cc->sector_size != (1 << SECTOR_SHIFT)) |
| 2050 | DMEMIT(" sector_size:%d", cc->sector_size); |
| 2051 | if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) |
| 2052 | DMEMIT(" iv_large_sectors"); |
Mikulas Patocka | f3396c58 | 2015-02-13 08:23:09 -0500 | [diff] [blame] | 2053 | } |
Milan Broz | 772ae5f | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 2054 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | break; |
| 2056 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | } |
| 2058 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2059 | static void crypt_postsuspend(struct dm_target *ti) |
| 2060 | { |
| 2061 | struct crypt_config *cc = ti->private; |
| 2062 | |
| 2063 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 2064 | } |
| 2065 | |
| 2066 | static int crypt_preresume(struct dm_target *ti) |
| 2067 | { |
| 2068 | struct crypt_config *cc = ti->private; |
| 2069 | |
| 2070 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { |
| 2071 | DMERR("aborting resume - crypt key is not set."); |
| 2072 | return -EAGAIN; |
| 2073 | } |
| 2074 | |
| 2075 | return 0; |
| 2076 | } |
| 2077 | |
| 2078 | static void crypt_resume(struct dm_target *ti) |
| 2079 | { |
| 2080 | struct crypt_config *cc = ti->private; |
| 2081 | |
| 2082 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 2083 | } |
| 2084 | |
| 2085 | /* Message interface |
| 2086 | * key set <key> |
| 2087 | * key wipe |
| 2088 | */ |
| 2089 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) |
| 2090 | { |
| 2091 | struct crypt_config *cc = ti->private; |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 2092 | int ret = -EINVAL; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2093 | |
| 2094 | if (argc < 2) |
| 2095 | goto error; |
| 2096 | |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 2097 | if (!strcasecmp(argv[0], "key")) { |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2098 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
| 2099 | DMWARN("not suspended during key manipulation."); |
| 2100 | return -EINVAL; |
| 2101 | } |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 2102 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 2103 | ret = crypt_set_key(cc, argv[2]); |
| 2104 | if (ret) |
| 2105 | return ret; |
| 2106 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) |
| 2107 | ret = cc->iv_gen_ops->init(cc); |
| 2108 | return ret; |
| 2109 | } |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 2110 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 2111 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
| 2112 | ret = cc->iv_gen_ops->wipe(cc); |
| 2113 | if (ret) |
| 2114 | return ret; |
| 2115 | } |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2116 | return crypt_wipe_key(cc); |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 2117 | } |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2118 | } |
| 2119 | |
| 2120 | error: |
| 2121 | DMWARN("unrecognised message received."); |
| 2122 | return -EINVAL; |
| 2123 | } |
| 2124 | |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 2125 | static int crypt_iterate_devices(struct dm_target *ti, |
| 2126 | iterate_devices_callout_fn fn, void *data) |
| 2127 | { |
| 2128 | struct crypt_config *cc = ti->private; |
| 2129 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 2130 | return fn(ti, cc->dev, cc->start, ti->len, data); |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 2131 | } |
| 2132 | |
Mike Snitzer | 586b286 | 2015-09-09 21:34:51 -0400 | [diff] [blame] | 2133 | static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 2134 | { |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 2135 | struct crypt_config *cc = ti->private; |
| 2136 | |
Mike Snitzer | 586b286 | 2015-09-09 21:34:51 -0400 | [diff] [blame] | 2137 | /* |
| 2138 | * Unfortunate constraint that is required to avoid the potential |
| 2139 | * for exceeding underlying device's max_segments limits -- due to |
| 2140 | * crypt_alloc_buffer() possibly allocating pages for the encryption |
| 2141 | * bio that are not as physically contiguous as the original bio. |
| 2142 | */ |
| 2143 | limits->max_segment_size = PAGE_SIZE; |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 2144 | |
Mikulas Patocka | f3e3edc | 2018-08-10 11:23:56 -0400 | [diff] [blame] | 2145 | limits->logical_block_size = |
| 2146 | max_t(unsigned short, limits->logical_block_size, cc->sector_size); |
| 2147 | limits->physical_block_size = |
| 2148 | max_t(unsigned, limits->physical_block_size, cc->sector_size); |
| 2149 | limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size); |
Mike Snitzer | 586b286 | 2015-09-09 21:34:51 -0400 | [diff] [blame] | 2150 | } |
| 2151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | static struct target_type crypt_target = { |
| 2153 | .name = "crypt", |
Milan Broz | c083ebe | 2017-03-16 15:39:44 +0100 | [diff] [blame] | 2154 | .version = {1, 17, 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | .module = THIS_MODULE, |
| 2156 | .ctr = crypt_ctr, |
| 2157 | .dtr = crypt_dtr, |
| 2158 | .map = crypt_map, |
| 2159 | .status = crypt_status, |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 2160 | .postsuspend = crypt_postsuspend, |
| 2161 | .preresume = crypt_preresume, |
| 2162 | .resume = crypt_resume, |
| 2163 | .message = crypt_message, |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 2164 | .iterate_devices = crypt_iterate_devices, |
Mike Snitzer | 586b286 | 2015-09-09 21:34:51 -0400 | [diff] [blame] | 2165 | .io_hints = crypt_io_hints, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | }; |
| 2167 | |
| 2168 | static int __init dm_crypt_init(void) |
| 2169 | { |
| 2170 | int r; |
| 2171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | r = dm_register_target(&crypt_target); |
Mikulas Patocka | 94f5e02 | 2015-02-13 08:25:26 -0500 | [diff] [blame] | 2173 | if (r < 0) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 2174 | DMERR("register failed %d", r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | return r; |
| 2177 | } |
| 2178 | |
| 2179 | static void __exit dm_crypt_exit(void) |
| 2180 | { |
Mikulas Patocka | 10d3bd0 | 2009-01-06 03:04:58 +0000 | [diff] [blame] | 2181 | dm_unregister_target(&crypt_target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | } |
| 2183 | |
| 2184 | module_init(dm_crypt_init); |
| 2185 | module_exit(dm_crypt_exit); |
| 2186 | |
Jana Saout | bf14299 | 2014-06-24 14:27:04 -0400 | [diff] [blame] | 2187 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
| 2189 | MODULE_LICENSE("GPL"); |