Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003 Christophe Saout <christophe@saout.de> |
| 3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 4 | * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This file is released under the GPL. |
| 7 | */ |
| 8 | |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 9 | #include <linux/completion.h> |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 10 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/bio.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <linux/mempool.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/crypto.h> |
| 19 | #include <linux/workqueue.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 20 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/atomic.h> |
David Hardeman | 378f058 | 2005-09-17 17:55:31 +1000 | [diff] [blame] | 22 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <asm/page.h> |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 24 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Mikulas Patocka | 586e80e | 2008-10-21 17:44:59 +0100 | [diff] [blame] | 26 | #include <linux/device-mapper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 28 | #define DM_MSG_PREFIX "crypt" |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 29 | #define MESG_STR(x) x, sizeof(x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * context holding the current state of a multi-part conversion |
| 33 | */ |
| 34 | struct convert_context { |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 35 | struct completion restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | struct bio *bio_in; |
| 37 | struct bio *bio_out; |
| 38 | unsigned int offset_in; |
| 39 | unsigned int offset_out; |
| 40 | unsigned int idx_in; |
| 41 | unsigned int idx_out; |
| 42 | sector_t sector; |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 43 | atomic_t pending; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 46 | /* |
| 47 | * per bio private data |
| 48 | */ |
| 49 | struct dm_crypt_io { |
| 50 | struct dm_target *target; |
| 51 | struct bio *base_bio; |
| 52 | struct work_struct work; |
| 53 | |
| 54 | struct convert_context ctx; |
| 55 | |
| 56 | atomic_t pending; |
| 57 | int error; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 58 | sector_t sector; |
Milan Broz | 393b47e | 2008-10-21 17:45:02 +0100 | [diff] [blame] | 59 | struct dm_crypt_io *base_io; |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 60 | }; |
| 61 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 62 | struct dm_crypt_request { |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 63 | struct convert_context *ctx; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 64 | struct scatterlist sg_in; |
| 65 | struct scatterlist sg_out; |
| 66 | }; |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | struct crypt_config; |
| 69 | |
| 70 | struct crypt_iv_operations { |
| 71 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 72 | const char *opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | void (*dtr)(struct crypt_config *cc); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 74 | int (*init)(struct crypt_config *cc); |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 75 | int (*wipe)(struct crypt_config *cc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); |
| 77 | }; |
| 78 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 79 | struct iv_essiv_private { |
| 80 | struct crypto_cipher *tfm; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 81 | struct crypto_hash *hash_tfm; |
| 82 | u8 *salt; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 83 | }; |
| 84 | |
| 85 | struct iv_benbi_private { |
| 86 | int shift; |
| 87 | }; |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | /* |
| 90 | * Crypt: maps a linear range of a block device |
| 91 | * and encrypts / decrypts at the same time. |
| 92 | */ |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 93 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | struct crypt_config { |
| 95 | struct dm_dev *dev; |
| 96 | sector_t start; |
| 97 | |
| 98 | /* |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 99 | * pool for per bio private data, crypto requests and |
| 100 | * encryption requeusts/buffer pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | */ |
| 102 | mempool_t *io_pool; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 103 | mempool_t *req_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | mempool_t *page_pool; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 105 | struct bio_set *bs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 107 | struct workqueue_struct *io_queue; |
| 108 | struct workqueue_struct *crypt_queue; |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* |
| 111 | * crypto related data |
| 112 | */ |
| 113 | struct crypt_iv_operations *iv_gen_ops; |
| 114 | char *iv_mode; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 115 | union { |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 116 | struct iv_essiv_private essiv; |
| 117 | struct iv_benbi_private benbi; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 118 | } iv_gen_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | sector_t iv_offset; |
| 120 | unsigned int iv_size; |
| 121 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 122 | /* |
| 123 | * Layout of each crypto request: |
| 124 | * |
| 125 | * struct ablkcipher_request |
| 126 | * context |
| 127 | * padding |
| 128 | * struct dm_crypt_request |
| 129 | * padding |
| 130 | * IV |
| 131 | * |
| 132 | * The padding is added so that dm_crypt_request and the IV are |
| 133 | * correctly aligned. |
| 134 | */ |
| 135 | unsigned int dmreq_start; |
| 136 | struct ablkcipher_request *req; |
| 137 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 138 | char cipher[CRYPTO_MAX_ALG_NAME]; |
| 139 | char chainmode[CRYPTO_MAX_ALG_NAME]; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 140 | struct crypto_ablkcipher *tfm; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 141 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | unsigned int key_size; |
| 143 | u8 key[0]; |
| 144 | }; |
| 145 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 146 | #define MIN_IOS 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | #define MIN_POOL_PAGES 32 |
| 148 | #define MIN_BIO_PAGES 8 |
| 149 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 150 | static struct kmem_cache *_crypt_io_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 152 | static void clone_init(struct dm_crypt_io *, struct bio *); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 153 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | * Different IV generation algorithms: |
| 157 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 158 | * 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] | 159 | * number, padded with zeros if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 161 | * essiv: "encrypted sector|salt initial vector", the sector number is |
| 162 | * encrypted with the bulk cipher using a salt as key. The salt |
| 163 | * should be derived from the bulk cipher's key via hashing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | * |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 165 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
| 166 | * (needed for LRW-32-AES and possible other narrow block modes) |
| 167 | * |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 168 | * null: the initial vector is always zero. Provides compatibility with |
| 169 | * obsolete loop_fish2 devices. Do not use for new devices. |
| 170 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | * plumb: unimplemented, see: |
| 172 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 |
| 173 | */ |
| 174 | |
| 175 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 176 | { |
| 177 | memset(iv, 0, cc->iv_size); |
| 178 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 183 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
| 184 | static int crypt_iv_essiv_init(struct crypt_config *cc) |
| 185 | { |
| 186 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
| 187 | struct hash_desc desc; |
| 188 | struct scatterlist sg; |
| 189 | int err; |
| 190 | |
| 191 | sg_init_one(&sg, cc->key, cc->key_size); |
| 192 | desc.tfm = essiv->hash_tfm; |
| 193 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 194 | |
| 195 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); |
| 196 | if (err) |
| 197 | return err; |
| 198 | |
| 199 | return crypto_cipher_setkey(essiv->tfm, essiv->salt, |
| 200 | crypto_hash_digestsize(essiv->hash_tfm)); |
| 201 | } |
| 202 | |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 203 | /* Wipe salt and reset key derived from volume key */ |
| 204 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) |
| 205 | { |
| 206 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
| 207 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); |
| 208 | |
| 209 | memset(essiv->salt, 0, salt_size); |
| 210 | |
| 211 | return crypto_cipher_setkey(essiv->tfm, essiv->salt, salt_size); |
| 212 | } |
| 213 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 214 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
| 215 | { |
| 216 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
| 217 | |
| 218 | crypto_free_cipher(essiv->tfm); |
| 219 | essiv->tfm = NULL; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 220 | |
| 221 | crypto_free_hash(essiv->hash_tfm); |
| 222 | essiv->hash_tfm = NULL; |
| 223 | |
| 224 | kzfree(essiv->salt); |
| 225 | essiv->salt = NULL; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 226 | } |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | 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] | 229 | const char *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 231 | struct crypto_cipher *essiv_tfm = NULL; |
| 232 | struct crypto_hash *hash_tfm = NULL; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 233 | u8 *salt = NULL; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 234 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 236 | if (!opts) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 237 | ti->error = "Digest algorithm missing for ESSIV mode"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | return -EINVAL; |
| 239 | } |
| 240 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 241 | /* Allocate hash algorithm */ |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 242 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
| 243 | if (IS_ERR(hash_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 244 | ti->error = "Error initializing ESSIV hash"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 245 | err = PTR_ERR(hash_tfm); |
| 246 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 249 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 250 | if (!salt) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 251 | ti->error = "Error kmallocing salt storage in ESSIV"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 252 | err = -ENOMEM; |
| 253 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 256 | /* Allocate essiv_tfm */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 257 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 258 | if (IS_ERR(essiv_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 259 | ti->error = "Error allocating crypto tfm for ESSIV"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 260 | err = PTR_ERR(essiv_tfm); |
| 261 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 263 | if (crypto_cipher_blocksize(essiv_tfm) != |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 264 | crypto_ablkcipher_ivsize(cc->tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 265 | ti->error = "Block size of ESSIV cipher does " |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 266 | "not match IV size of block cipher"; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 267 | err = -EINVAL; |
| 268 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 271 | cc->iv_gen_private.essiv.salt = salt; |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 272 | cc->iv_gen_private.essiv.tfm = essiv_tfm; |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 273 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | return 0; |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 276 | |
| 277 | bad: |
| 278 | if (essiv_tfm && !IS_ERR(essiv_tfm)) |
| 279 | crypto_free_cipher(essiv_tfm); |
| 280 | if (hash_tfm && !IS_ERR(hash_tfm)) |
| 281 | crypto_free_hash(hash_tfm); |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 282 | kfree(salt); |
Milan Broz | 5861f1b | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 283 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 287 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | memset(iv, 0, cc->iv_size); |
| 289 | *(u64 *)iv = cpu_to_le64(sector); |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 290 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv.tfm, iv, iv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 294 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 295 | const char *opts) |
| 296 | { |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 297 | unsigned bs = crypto_ablkcipher_blocksize(cc->tfm); |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 298 | int log = ilog2(bs); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 299 | |
| 300 | /* we need to calculate how far we must shift the sector count |
| 301 | * to get the cipher block count, we use this shift in _gen */ |
| 302 | |
| 303 | if (1 << log != bs) { |
| 304 | ti->error = "cypher blocksize is not a power of 2"; |
| 305 | return -EINVAL; |
| 306 | } |
| 307 | |
| 308 | if (log > 9) { |
| 309 | ti->error = "cypher blocksize is > 512"; |
| 310 | return -EINVAL; |
| 311 | } |
| 312 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 313 | cc->iv_gen_private.benbi.shift = 9 - log; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) |
| 319 | { |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 323 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 324 | __be64 val; |
| 325 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 326 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 327 | |
Milan Broz | 6047359 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 328 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi.shift) + 1); |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 329 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | return 0; |
| 332 | } |
| 333 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 334 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 335 | { |
| 336 | memset(iv, 0, cc->iv_size); |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
| 342 | .generator = crypt_iv_plain_gen |
| 343 | }; |
| 344 | |
| 345 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
| 346 | .ctr = crypt_iv_essiv_ctr, |
| 347 | .dtr = crypt_iv_essiv_dtr, |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 348 | .init = crypt_iv_essiv_init, |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 349 | .wipe = crypt_iv_essiv_wipe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | .generator = crypt_iv_essiv_gen |
| 351 | }; |
| 352 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 353 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
| 354 | .ctr = crypt_iv_benbi_ctr, |
| 355 | .dtr = crypt_iv_benbi_dtr, |
| 356 | .generator = crypt_iv_benbi_gen |
| 357 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 359 | static struct crypt_iv_operations crypt_iv_null_ops = { |
| 360 | .generator = crypt_iv_null_gen |
| 361 | }; |
| 362 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 363 | static void crypt_convert_init(struct crypt_config *cc, |
| 364 | struct convert_context *ctx, |
| 365 | struct bio *bio_out, struct bio *bio_in, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 366 | sector_t sector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
| 368 | ctx->bio_in = bio_in; |
| 369 | ctx->bio_out = bio_out; |
| 370 | ctx->offset_in = 0; |
| 371 | ctx->offset_out = 0; |
| 372 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; |
| 373 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; |
| 374 | ctx->sector = sector + cc->iv_offset; |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 375 | init_completion(&ctx->restart); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 378 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
| 379 | struct ablkcipher_request *req) |
| 380 | { |
| 381 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); |
| 382 | } |
| 383 | |
| 384 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, |
| 385 | struct dm_crypt_request *dmreq) |
| 386 | { |
| 387 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); |
| 388 | } |
| 389 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 390 | static int crypt_convert_block(struct crypt_config *cc, |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 391 | struct convert_context *ctx, |
| 392 | struct ablkcipher_request *req) |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 393 | { |
| 394 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); |
| 395 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 396 | struct dm_crypt_request *dmreq; |
| 397 | u8 *iv; |
| 398 | int r = 0; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 399 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 400 | dmreq = dmreq_of_req(cc, req); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 401 | iv = (u8 *)ALIGN((unsigned long)(dmreq + 1), |
| 402 | crypto_ablkcipher_alignmask(cc->tfm) + 1); |
| 403 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 404 | dmreq->ctx = ctx; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 405 | sg_init_table(&dmreq->sg_in, 1); |
| 406 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 407 | bv_in->bv_offset + ctx->offset_in); |
| 408 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 409 | sg_init_table(&dmreq->sg_out, 1); |
| 410 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 411 | bv_out->bv_offset + ctx->offset_out); |
| 412 | |
| 413 | ctx->offset_in += 1 << SECTOR_SHIFT; |
| 414 | if (ctx->offset_in >= bv_in->bv_len) { |
| 415 | ctx->offset_in = 0; |
| 416 | ctx->idx_in++; |
| 417 | } |
| 418 | |
| 419 | ctx->offset_out += 1 << SECTOR_SHIFT; |
| 420 | if (ctx->offset_out >= bv_out->bv_len) { |
| 421 | ctx->offset_out = 0; |
| 422 | ctx->idx_out++; |
| 423 | } |
| 424 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 425 | if (cc->iv_gen_ops) { |
| 426 | r = cc->iv_gen_ops->generator(cc, iv, ctx->sector); |
| 427 | if (r < 0) |
| 428 | return r; |
| 429 | } |
| 430 | |
| 431 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, |
| 432 | 1 << SECTOR_SHIFT, iv); |
| 433 | |
| 434 | if (bio_data_dir(ctx->bio_in) == WRITE) |
| 435 | r = crypto_ablkcipher_encrypt(req); |
| 436 | else |
| 437 | r = crypto_ablkcipher_decrypt(req); |
| 438 | |
| 439 | return r; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 440 | } |
| 441 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 442 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 443 | int error); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 444 | static void crypt_alloc_req(struct crypt_config *cc, |
| 445 | struct convert_context *ctx) |
| 446 | { |
| 447 | if (!cc->req) |
| 448 | cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 449 | ablkcipher_request_set_tfm(cc->req, cc->tfm); |
| 450 | ablkcipher_request_set_callback(cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 451 | CRYPTO_TFM_REQ_MAY_SLEEP, |
| 452 | kcryptd_async_done, |
| 453 | dmreq_of_req(cc, cc->req)); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 454 | } |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | /* |
| 457 | * Encrypt / decrypt data from one bio to another one (can be the same one) |
| 458 | */ |
| 459 | static int crypt_convert(struct crypt_config *cc, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 460 | struct convert_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 462 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 464 | atomic_set(&ctx->pending, 1); |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
| 467 | ctx->idx_out < ctx->bio_out->bi_vcnt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 469 | crypt_alloc_req(cc, ctx); |
| 470 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 471 | atomic_inc(&ctx->pending); |
| 472 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 473 | r = crypt_convert_block(cc, ctx, cc->req); |
| 474 | |
| 475 | switch (r) { |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 476 | /* async */ |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 477 | case -EBUSY: |
| 478 | wait_for_completion(&ctx->restart); |
| 479 | INIT_COMPLETION(ctx->restart); |
| 480 | /* fall through*/ |
| 481 | case -EINPROGRESS: |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 482 | cc->req = NULL; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 483 | ctx->sector++; |
| 484 | continue; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 485 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 486 | /* sync */ |
| 487 | case 0: |
| 488 | atomic_dec(&ctx->pending); |
| 489 | ctx->sector++; |
Milan Broz | c7f1b20 | 2008-07-02 09:34:28 +0100 | [diff] [blame] | 490 | cond_resched(); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 491 | continue; |
| 492 | |
| 493 | /* error */ |
| 494 | default: |
| 495 | atomic_dec(&ctx->pending); |
| 496 | return r; |
| 497 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | } |
| 499 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 500 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 503 | static void dm_crypt_bio_destructor(struct bio *bio) |
| 504 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 505 | struct dm_crypt_io *io = bio->bi_private; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 506 | struct crypt_config *cc = io->target->private; |
| 507 | |
| 508 | bio_free(bio, cc->bs); |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 509 | } |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* |
| 512 | * Generate a new unfragmented bio with the given size |
| 513 | * This should never violate the device limitations |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 514 | * May return a smaller bio when running out of pages, indicated by |
| 515 | * *out_of_pages set to 1. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | */ |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 517 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
| 518 | unsigned *out_of_pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | { |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 520 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 521 | struct bio *clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Al Viro | b4e3ca1 | 2005-10-21 03:22:34 -0400 | [diff] [blame] | 523 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 524 | unsigned i, len; |
| 525 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 527 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 528 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 531 | clone_init(io, clone); |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 532 | *out_of_pages = 0; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 533 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 534 | for (i = 0; i < nr_iovecs; i++) { |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 535 | page = mempool_alloc(cc->page_pool, gfp_mask); |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 536 | if (!page) { |
| 537 | *out_of_pages = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | break; |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | /* |
| 542 | * if additional pages cannot be allocated without waiting, |
| 543 | * return a partially allocated bio, the caller will then try |
| 544 | * to allocate additional bios while submitting this partial bio |
| 545 | */ |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 546 | if (i == (MIN_BIO_PAGES - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
| 548 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 549 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 551 | if (!bio_add_page(clone, page, len, 0)) { |
| 552 | mempool_free(page, cc->page_pool); |
| 553 | break; |
| 554 | } |
| 555 | |
| 556 | size -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 559 | if (!clone->bi_size) { |
| 560 | bio_put(clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return NULL; |
| 562 | } |
| 563 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 564 | return clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 567 | 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] | 568 | { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 569 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | struct bio_vec *bv; |
| 571 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 572 | for (i = 0; i < clone->bi_vcnt; i++) { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 573 | bv = bio_iovec_idx(clone, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | BUG_ON(!bv->bv_page); |
| 575 | mempool_free(bv->bv_page, cc->page_pool); |
| 576 | bv->bv_page = NULL; |
| 577 | } |
| 578 | } |
| 579 | |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 580 | static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, |
| 581 | struct bio *bio, sector_t sector) |
| 582 | { |
| 583 | struct crypt_config *cc = ti->private; |
| 584 | struct dm_crypt_io *io; |
| 585 | |
| 586 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
| 587 | io->target = ti; |
| 588 | io->base_bio = bio; |
| 589 | io->sector = sector; |
| 590 | io->error = 0; |
Milan Broz | 393b47e | 2008-10-21 17:45:02 +0100 | [diff] [blame] | 591 | io->base_io = NULL; |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 592 | atomic_set(&io->pending, 0); |
| 593 | |
| 594 | return io; |
| 595 | } |
| 596 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 597 | static void crypt_inc_pending(struct dm_crypt_io *io) |
| 598 | { |
| 599 | atomic_inc(&io->pending); |
| 600 | } |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | /* |
| 603 | * One of the bios was finished. Check for completion of |
| 604 | * the whole request and correctly clean up the buffer. |
Milan Broz | 393b47e | 2008-10-21 17:45:02 +0100 | [diff] [blame] | 605 | * If base_io is set, wait for the last fragment to complete. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | */ |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 607 | static void crypt_dec_pending(struct dm_crypt_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 609 | struct crypt_config *cc = io->target->private; |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 610 | struct bio *base_bio = io->base_bio; |
| 611 | struct dm_crypt_io *base_io = io->base_io; |
| 612 | int error = io->error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
| 614 | if (!atomic_dec_and_test(&io->pending)) |
| 615 | return; |
| 616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | mempool_free(io, cc->io_pool); |
Milan Broz | b35f8ca | 2009-03-16 17:44:36 +0000 | [diff] [blame] | 618 | |
| 619 | if (likely(!base_io)) |
| 620 | bio_endio(base_bio, error); |
| 621 | else { |
| 622 | if (error && !base_io->error) |
| 623 | base_io->error = error; |
| 624 | crypt_dec_pending(base_io); |
| 625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | /* |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 629 | * kcryptd/kcryptd_io: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | * |
| 631 | * Needed because it would be very unwise to do decryption in an |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 632 | * interrupt context. |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 633 | * |
| 634 | * kcryptd performs the actual encryption or decryption. |
| 635 | * |
| 636 | * kcryptd_io performs the IO submission. |
| 637 | * |
| 638 | * They must be separated as otherwise the final stages could be |
| 639 | * starved by new requests which can block in the first stages due |
| 640 | * to memory allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | */ |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 642 | static void crypt_endio(struct bio *clone, int error) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 643 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 644 | struct dm_crypt_io *io = clone->bi_private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 645 | struct crypt_config *cc = io->target->private; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 646 | unsigned rw = bio_data_dir(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 647 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 648 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
| 649 | error = -EIO; |
| 650 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 651 | /* |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 652 | * free the processed pages |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 653 | */ |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 654 | if (rw == WRITE) |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 655 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 656 | |
| 657 | bio_put(clone); |
| 658 | |
| 659 | if (rw == READ && !error) { |
| 660 | kcryptd_queue_crypt(io); |
| 661 | return; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 662 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 663 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 664 | if (unlikely(error)) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 665 | io->error = error; |
| 666 | |
| 667 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 670 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 671 | { |
| 672 | struct crypt_config *cc = io->target->private; |
| 673 | |
| 674 | clone->bi_private = io; |
| 675 | clone->bi_end_io = crypt_endio; |
| 676 | clone->bi_bdev = cc->dev->bdev; |
| 677 | clone->bi_rw = io->base_bio->bi_rw; |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 678 | clone->bi_destructor = dm_crypt_bio_destructor; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 681 | static void kcryptd_io_read(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 682 | { |
| 683 | struct crypt_config *cc = io->target->private; |
| 684 | struct bio *base_bio = io->base_bio; |
| 685 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 686 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 687 | crypt_inc_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 688 | |
| 689 | /* |
| 690 | * The block layer might modify the bvec array, so always |
| 691 | * copy the required bvecs because we need the original |
| 692 | * one in order to decrypt the whole bio data *afterwards*. |
| 693 | */ |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 694 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 695 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 696 | io->error = -ENOMEM; |
| 697 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 698 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 699 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 700 | |
| 701 | clone_init(io, clone); |
| 702 | clone->bi_idx = 0; |
| 703 | clone->bi_vcnt = bio_segments(base_bio); |
| 704 | clone->bi_size = base_bio->bi_size; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 705 | clone->bi_sector = cc->start + io->sector; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 706 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
| 707 | sizeof(struct bio_vec) * clone->bi_vcnt); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 708 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 709 | generic_make_request(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 710 | } |
| 711 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 712 | static void kcryptd_io_write(struct dm_crypt_io *io) |
| 713 | { |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 714 | struct bio *clone = io->ctx.bio_out; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 715 | generic_make_request(clone); |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 716 | } |
| 717 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 718 | static void kcryptd_io(struct work_struct *work) |
| 719 | { |
| 720 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 721 | |
| 722 | if (bio_data_dir(io->base_bio) == READ) |
| 723 | kcryptd_io_read(io); |
| 724 | else |
| 725 | kcryptd_io_write(io); |
| 726 | } |
| 727 | |
| 728 | static void kcryptd_queue_io(struct dm_crypt_io *io) |
| 729 | { |
| 730 | struct crypt_config *cc = io->target->private; |
| 731 | |
| 732 | INIT_WORK(&io->work, kcryptd_io); |
| 733 | queue_work(cc->io_queue, &io->work); |
| 734 | } |
| 735 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 736 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, |
| 737 | int error, int async) |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 738 | { |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 739 | struct bio *clone = io->ctx.bio_out; |
| 740 | struct crypt_config *cc = io->target->private; |
| 741 | |
| 742 | if (unlikely(error < 0)) { |
| 743 | crypt_free_buffer_pages(cc, clone); |
| 744 | bio_put(clone); |
| 745 | io->error = -EIO; |
Milan Broz | 6c031f4 | 2008-10-10 13:37:06 +0100 | [diff] [blame] | 746 | crypt_dec_pending(io); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 747 | return; |
| 748 | } |
| 749 | |
| 750 | /* crypt_convert should have filled the clone bio */ |
| 751 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); |
| 752 | |
| 753 | clone->bi_sector = cc->start + io->sector; |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 754 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 755 | if (async) |
| 756 | kcryptd_queue_io(io); |
Alasdair G Kergon | 1e37bb8 | 2008-10-10 13:37:05 +0100 | [diff] [blame] | 757 | else |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 758 | generic_make_request(clone); |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 759 | } |
| 760 | |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 761 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 762 | { |
| 763 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 764 | struct bio *clone; |
Milan Broz | 393b47e | 2008-10-21 17:45:02 +0100 | [diff] [blame] | 765 | struct dm_crypt_io *new_io; |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 766 | int crypt_finished; |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 767 | unsigned out_of_pages = 0; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 768 | unsigned remaining = io->base_bio->bi_size; |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 769 | sector_t sector = io->sector; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 770 | int r; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 771 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 772 | /* |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 773 | * Prevent io from disappearing until this function completes. |
| 774 | */ |
| 775 | crypt_inc_pending(io); |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 776 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 777 | |
| 778 | /* |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 779 | * The allocated buffers can be smaller than the whole bio, |
| 780 | * so repeat the whole process until all the data can be handled. |
| 781 | */ |
| 782 | while (remaining) { |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 783 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 784 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 785 | io->error = -ENOMEM; |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 786 | break; |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 787 | } |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 788 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 789 | io->ctx.bio_out = clone; |
| 790 | io->ctx.idx_out = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 791 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 792 | remaining -= clone->bi_size; |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 793 | sector += bio_sectors(clone); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 794 | |
Milan Broz | 4e59409 | 2008-10-10 13:37:07 +0100 | [diff] [blame] | 795 | crypt_inc_pending(io); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 796 | r = crypt_convert(cc, &io->ctx); |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 797 | crypt_finished = atomic_dec_and_test(&io->ctx.pending); |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 798 | |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 799 | /* Encryption was already finished, submit io now */ |
| 800 | if (crypt_finished) { |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 801 | kcryptd_crypt_write_io_submit(io, r, 0); |
Milan Broz | c808161 | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 802 | |
| 803 | /* |
| 804 | * If there was an error, do not try next fragments. |
| 805 | * For async, error is processed in async handler. |
| 806 | */ |
Milan Broz | 6c031f4 | 2008-10-10 13:37:06 +0100 | [diff] [blame] | 807 | if (unlikely(r < 0)) |
Milan Broz | fc5a5e9 | 2008-10-10 13:37:04 +0100 | [diff] [blame] | 808 | break; |
Milan Broz | b635b00 | 2008-10-21 17:45:00 +0100 | [diff] [blame] | 809 | |
| 810 | io->sector = sector; |
Milan Broz | 4e59409 | 2008-10-10 13:37:07 +0100 | [diff] [blame] | 811 | } |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 812 | |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 813 | /* |
| 814 | * Out of memory -> run queues |
| 815 | * But don't wait if split was due to the io size restriction |
| 816 | */ |
| 817 | if (unlikely(out_of_pages)) |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 818 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
Milan Broz | 933f01d | 2008-10-10 13:37:08 +0100 | [diff] [blame] | 819 | |
Milan Broz | 393b47e | 2008-10-21 17:45:02 +0100 | [diff] [blame] | 820 | /* |
| 821 | * With async crypto it is unsafe to share the crypto context |
| 822 | * between fragments, so switch to a new dm_crypt_io structure. |
| 823 | */ |
| 824 | if (unlikely(!crypt_finished && remaining)) { |
| 825 | new_io = crypt_io_alloc(io->target, io->base_bio, |
| 826 | sector); |
| 827 | crypt_inc_pending(new_io); |
| 828 | crypt_convert_init(cc, &new_io->ctx, NULL, |
| 829 | io->base_bio, sector); |
| 830 | new_io->ctx.idx_in = io->ctx.idx_in; |
| 831 | new_io->ctx.offset_in = io->ctx.offset_in; |
| 832 | |
| 833 | /* |
| 834 | * Fragments after the first use the base_io |
| 835 | * pending count. |
| 836 | */ |
| 837 | if (!io->base_io) |
| 838 | new_io->base_io = io; |
| 839 | else { |
| 840 | new_io->base_io = io->base_io; |
| 841 | crypt_inc_pending(io->base_io); |
| 842 | crypt_dec_pending(io); |
| 843 | } |
| 844 | |
| 845 | io = new_io; |
| 846 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 847 | } |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 848 | |
| 849 | crypt_dec_pending(io); |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 850 | } |
| 851 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 852 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 853 | { |
| 854 | if (unlikely(error < 0)) |
| 855 | io->error = -EIO; |
| 856 | |
| 857 | crypt_dec_pending(io); |
| 858 | } |
| 859 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 860 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 861 | { |
| 862 | struct crypt_config *cc = io->target->private; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 863 | int r = 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 864 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame] | 865 | crypt_inc_pending(io); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 866 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 867 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 868 | io->sector); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 869 | |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 870 | r = crypt_convert(cc, &io->ctx); |
| 871 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 872 | if (atomic_dec_and_test(&io->ctx.pending)) |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 873 | kcryptd_crypt_read_done(io, r); |
| 874 | |
| 875 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 878 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 879 | int error) |
| 880 | { |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 881 | struct dm_crypt_request *dmreq = async_req->data; |
| 882 | struct convert_context *ctx = dmreq->ctx; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 883 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
| 884 | struct crypt_config *cc = io->target->private; |
| 885 | |
| 886 | if (error == -EINPROGRESS) { |
| 887 | complete(&ctx->restart); |
| 888 | return; |
| 889 | } |
| 890 | |
Huang Ying | b2174ee | 2009-03-16 17:44:33 +0000 | [diff] [blame] | 891 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 892 | |
| 893 | if (!atomic_dec_and_test(&ctx->pending)) |
| 894 | return; |
| 895 | |
| 896 | if (bio_data_dir(io->base_bio) == READ) |
| 897 | kcryptd_crypt_read_done(io, error); |
| 898 | else |
| 899 | kcryptd_crypt_write_io_submit(io, error, 1); |
| 900 | } |
| 901 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 902 | static void kcryptd_crypt(struct work_struct *work) |
| 903 | { |
| 904 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 905 | |
| 906 | if (bio_data_dir(io->base_bio) == READ) |
| 907 | kcryptd_crypt_read_convert(io); |
| 908 | else |
| 909 | kcryptd_crypt_write_convert(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 910 | } |
| 911 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 912 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
| 913 | { |
| 914 | struct crypt_config *cc = io->target->private; |
| 915 | |
| 916 | INIT_WORK(&io->work, kcryptd_crypt); |
| 917 | queue_work(cc->crypt_queue, &io->work); |
| 918 | } |
| 919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | /* |
| 921 | * Decode key from its hex representation |
| 922 | */ |
| 923 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) |
| 924 | { |
| 925 | char buffer[3]; |
| 926 | char *endp; |
| 927 | unsigned int i; |
| 928 | |
| 929 | buffer[2] = '\0'; |
| 930 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 931 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | buffer[0] = *hex++; |
| 933 | buffer[1] = *hex++; |
| 934 | |
| 935 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); |
| 936 | |
| 937 | if (endp != &buffer[2]) |
| 938 | return -EINVAL; |
| 939 | } |
| 940 | |
| 941 | if (*hex != '\0') |
| 942 | return -EINVAL; |
| 943 | |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | /* |
| 948 | * Encode key into its hex representation |
| 949 | */ |
| 950 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) |
| 951 | { |
| 952 | unsigned int i; |
| 953 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 954 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | sprintf(hex, "%02x", *key); |
| 956 | hex += 2; |
| 957 | key++; |
| 958 | } |
| 959 | } |
| 960 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 961 | static int crypt_set_key(struct crypt_config *cc, char *key) |
| 962 | { |
| 963 | unsigned key_size = strlen(key) >> 1; |
| 964 | |
| 965 | if (cc->key_size && cc->key_size != key_size) |
| 966 | return -EINVAL; |
| 967 | |
| 968 | cc->key_size = key_size; /* initial settings */ |
| 969 | |
| 970 | if ((!key_size && strcmp(key, "-")) || |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 971 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 972 | return -EINVAL; |
| 973 | |
| 974 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 975 | |
Milan Broz | 0b43095 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 976 | return crypto_ablkcipher_setkey(cc->tfm, cc->key, cc->key_size); |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | static int crypt_wipe_key(struct crypt_config *cc) |
| 980 | { |
| 981 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 982 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
Milan Broz | 0b43095 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 983 | return crypto_ablkcipher_setkey(cc->tfm, cc->key, cc->key_size); |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 984 | } |
| 985 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | /* |
| 987 | * Construct an encryption mapping: |
| 988 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 989 | */ |
| 990 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 991 | { |
| 992 | struct crypt_config *cc; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 993 | struct crypto_ablkcipher *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | char *tmp; |
| 995 | char *cipher; |
| 996 | char *chainmode; |
| 997 | char *ivmode; |
| 998 | char *ivopts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | unsigned int key_size; |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1000 | unsigned long long tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
| 1002 | if (argc != 5) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1003 | ti->error = "Not enough arguments"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | return -EINVAL; |
| 1005 | } |
| 1006 | |
| 1007 | tmp = argv[0]; |
| 1008 | cipher = strsep(&tmp, "-"); |
| 1009 | chainmode = strsep(&tmp, "-"); |
| 1010 | ivopts = strsep(&tmp, "-"); |
| 1011 | ivmode = strsep(&ivopts, ":"); |
| 1012 | |
| 1013 | if (tmp) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1014 | DMWARN("Unexpected additional cipher options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | key_size = strlen(argv[1]) >> 1; |
| 1017 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1018 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | if (cc == NULL) { |
| 1020 | ti->error = |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1021 | "Cannot allocate transparent encryption context"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | return -ENOMEM; |
| 1023 | } |
| 1024 | |
Dirk Hohndel | 06fe9fb | 2009-09-28 21:43:57 -0400 | [diff] [blame] | 1025 | /* Compatibility mode for old dm-crypt cipher strings */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { |
| 1027 | chainmode = "cbc"; |
| 1028 | ivmode = "plain"; |
| 1029 | } |
| 1030 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1031 | if (strcmp(chainmode, "ecb") && !ivmode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1032 | ti->error = "This chaining mode requires an IV mechanism"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1033 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 1036 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
| 1037 | chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1038 | ti->error = "Chain mode + cipher name is too long"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1039 | goto bad_cipher; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1040 | } |
| 1041 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1042 | tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1043 | if (IS_ERR(tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1044 | ti->error = "Error allocating crypto tfm"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1045 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1048 | strcpy(cc->cipher, cipher); |
| 1049 | strcpy(cc->chainmode, chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | cc->tfm = tfm; |
| 1051 | |
Milan Broz | 0b43095 | 2009-12-10 23:51:55 +0000 | [diff] [blame] | 1052 | if (crypt_set_key(cc, argv[1]) < 0) { |
| 1053 | ti->error = "Error decoding and setting key"; |
| 1054 | goto bad_ivmode; |
| 1055 | } |
| 1056 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | /* |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 1058 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | * See comments at iv code |
| 1060 | */ |
| 1061 | |
| 1062 | if (ivmode == NULL) |
| 1063 | cc->iv_gen_ops = NULL; |
| 1064 | else if (strcmp(ivmode, "plain") == 0) |
| 1065 | cc->iv_gen_ops = &crypt_iv_plain_ops; |
| 1066 | else if (strcmp(ivmode, "essiv") == 0) |
| 1067 | cc->iv_gen_ops = &crypt_iv_essiv_ops; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 1068 | else if (strcmp(ivmode, "benbi") == 0) |
| 1069 | cc->iv_gen_ops = &crypt_iv_benbi_ops; |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 1070 | else if (strcmp(ivmode, "null") == 0) |
| 1071 | cc->iv_gen_ops = &crypt_iv_null_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | else { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1073 | ti->error = "Invalid IV mode"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1074 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | } |
| 1076 | |
| 1077 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && |
| 1078 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1079 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
Milan Broz | b95bf2d | 2009-12-10 23:51:56 +0000 | [diff] [blame] | 1081 | if (cc->iv_gen_ops && cc->iv_gen_ops->init && |
| 1082 | cc->iv_gen_ops->init(cc) < 0) { |
| 1083 | ti->error = "Error initialising IV"; |
| 1084 | goto bad_slab_pool; |
| 1085 | } |
| 1086 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1087 | cc->iv_size = crypto_ablkcipher_ivsize(tfm); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1088 | if (cc->iv_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | /* at least a 64 bit sector number should fit in our buffer */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1090 | cc->iv_size = max(cc->iv_size, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 1091 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | if (cc->iv_gen_ops) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1094 | DMWARN("Selected cipher does not support IVs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | if (cc->iv_gen_ops->dtr) |
| 1096 | cc->iv_gen_ops->dtr(cc); |
| 1097 | cc->iv_gen_ops = NULL; |
| 1098 | } |
| 1099 | } |
| 1100 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1101 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | if (!cc->io_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1103 | ti->error = "Cannot allocate crypt io mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1104 | goto bad_slab_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | } |
| 1106 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1107 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1108 | cc->dmreq_start += crypto_ablkcipher_reqsize(tfm); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1109 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1110 | cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) & |
| 1111 | ~(crypto_tfm_ctx_alignment() - 1); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1112 | |
| 1113 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
| 1114 | sizeof(struct dm_crypt_request) + cc->iv_size); |
| 1115 | if (!cc->req_pool) { |
| 1116 | ti->error = "Cannot allocate crypt request mempool"; |
| 1117 | goto bad_req_pool; |
| 1118 | } |
| 1119 | cc->req = NULL; |
| 1120 | |
Matthew Dobson | a19b27c | 2006-03-26 01:37:45 -0800 | [diff] [blame] | 1121 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (!cc->page_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1123 | ti->error = "Cannot allocate page mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1124 | goto bad_page_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | } |
| 1126 | |
Jens Axboe | bb799ca | 2008-12-10 15:35:05 +0100 | [diff] [blame] | 1127 | cc->bs = bioset_create(MIN_IOS, 0); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1128 | if (!cc->bs) { |
| 1129 | ti->error = "Cannot allocate crypt bioset"; |
| 1130 | goto bad_bs; |
| 1131 | } |
| 1132 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1133 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1134 | ti->error = "Invalid iv_offset sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1135 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1137 | cc->iv_offset = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1139 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1140 | ti->error = "Invalid device sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1141 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1143 | cc->start = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
| 1145 | if (dm_get_device(ti, argv[3], cc->start, ti->len, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 1146 | dm_table_get_mode(ti->table), &cc->dev)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1147 | ti->error = "Device lookup failed"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1148 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | } |
| 1150 | |
| 1151 | if (ivmode && cc->iv_gen_ops) { |
| 1152 | if (ivopts) |
| 1153 | *(ivopts - 1) = ':'; |
| 1154 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); |
| 1155 | if (!cc->iv_mode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1156 | ti->error = "Error kmallocing iv_mode string"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1157 | goto bad_ivmode_string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | } |
| 1159 | strcpy(cc->iv_mode, ivmode); |
| 1160 | } else |
| 1161 | cc->iv_mode = NULL; |
| 1162 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1163 | cc->io_queue = create_singlethread_workqueue("kcryptd_io"); |
| 1164 | if (!cc->io_queue) { |
| 1165 | ti->error = "Couldn't create kcryptd io queue"; |
| 1166 | goto bad_io_queue; |
| 1167 | } |
| 1168 | |
| 1169 | cc->crypt_queue = create_singlethread_workqueue("kcryptd"); |
| 1170 | if (!cc->crypt_queue) { |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1171 | ti->error = "Couldn't create kcryptd queue"; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1172 | goto bad_crypt_queue; |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1173 | } |
| 1174 | |
Mikulas Patocka | 647c7db | 2009-06-22 10:12:23 +0100 | [diff] [blame] | 1175 | ti->num_flush_requests = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | ti->private = cc; |
| 1177 | return 0; |
| 1178 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1179 | bad_crypt_queue: |
| 1180 | destroy_workqueue(cc->io_queue); |
| 1181 | bad_io_queue: |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1182 | kfree(cc->iv_mode); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1183 | bad_ivmode_string: |
Dmitry Monakhov | 55b42c5 | 2007-10-19 22:38:37 +0100 | [diff] [blame] | 1184 | dm_put_device(ti, cc->dev); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1185 | bad_device: |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1186 | bioset_free(cc->bs); |
| 1187 | bad_bs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | mempool_destroy(cc->page_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1189 | bad_page_pool: |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1190 | mempool_destroy(cc->req_pool); |
| 1191 | bad_req_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | mempool_destroy(cc->io_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1193 | bad_slab_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1195 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1196 | bad_ivmode: |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1197 | crypto_free_ablkcipher(tfm); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1198 | bad_cipher: |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1199 | /* Must zero key material before freeing */ |
Johannes Weiner | b81d6cf | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 1200 | kzfree(cc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | return -EINVAL; |
| 1202 | } |
| 1203 | |
| 1204 | static void crypt_dtr(struct dm_target *ti) |
| 1205 | { |
| 1206 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
| 1207 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1208 | destroy_workqueue(cc->io_queue); |
| 1209 | destroy_workqueue(cc->crypt_queue); |
Milan Broz | 80b16c1 | 2007-07-21 04:37:27 -0700 | [diff] [blame] | 1210 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1211 | if (cc->req) |
| 1212 | mempool_free(cc->req, cc->req_pool); |
| 1213 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1214 | bioset_free(cc->bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | mempool_destroy(cc->page_pool); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1216 | mempool_destroy(cc->req_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | mempool_destroy(cc->io_pool); |
| 1218 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 1219 | kfree(cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1221 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1222 | crypto_free_ablkcipher(cc->tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | dm_put_device(ti, cc->dev); |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1224 | |
| 1225 | /* Must zero key material before freeing */ |
Johannes Weiner | b81d6cf | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 1226 | kzfree(cc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
| 1230 | union map_info *map_context) |
| 1231 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1232 | struct dm_crypt_io *io; |
Mikulas Patocka | 647c7db | 2009-06-22 10:12:23 +0100 | [diff] [blame] | 1233 | struct crypt_config *cc; |
| 1234 | |
| 1235 | if (unlikely(bio_empty_barrier(bio))) { |
| 1236 | cc = ti->private; |
| 1237 | bio->bi_bdev = cc->dev->bdev; |
| 1238 | return DM_MAPIO_REMAPPED; |
| 1239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Milan Broz | dc440d1e | 2008-10-10 13:37:03 +0100 | [diff] [blame] | 1241 | io = crypt_io_alloc(ti, bio, bio->bi_sector - ti->begin); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1242 | |
| 1243 | if (bio_data_dir(io->base_bio) == READ) |
| 1244 | kcryptd_queue_io(io); |
| 1245 | else |
| 1246 | kcryptd_queue_crypt(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 1248 | return DM_MAPIO_SUBMITTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | } |
| 1250 | |
| 1251 | static int crypt_status(struct dm_target *ti, status_type_t type, |
| 1252 | char *result, unsigned int maxlen) |
| 1253 | { |
| 1254 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | unsigned int sz = 0; |
| 1256 | |
| 1257 | switch (type) { |
| 1258 | case STATUSTYPE_INFO: |
| 1259 | result[0] = '\0'; |
| 1260 | break; |
| 1261 | |
| 1262 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | if (cc->iv_mode) |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1264 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
| 1265 | cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | else |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1267 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
| 1269 | if (cc->key_size > 0) { |
| 1270 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) |
| 1271 | return -ENOMEM; |
| 1272 | |
| 1273 | crypt_encode_key(result + sz, cc->key, cc->key_size); |
| 1274 | sz += cc->key_size << 1; |
| 1275 | } else { |
| 1276 | if (sz >= maxlen) |
| 1277 | return -ENOMEM; |
| 1278 | result[sz++] = '-'; |
| 1279 | } |
| 1280 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1281 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
| 1282 | cc->dev->name, (unsigned long long)cc->start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | break; |
| 1284 | } |
| 1285 | return 0; |
| 1286 | } |
| 1287 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1288 | static void crypt_postsuspend(struct dm_target *ti) |
| 1289 | { |
| 1290 | struct crypt_config *cc = ti->private; |
| 1291 | |
| 1292 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1293 | } |
| 1294 | |
| 1295 | static int crypt_preresume(struct dm_target *ti) |
| 1296 | { |
| 1297 | struct crypt_config *cc = ti->private; |
| 1298 | |
| 1299 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { |
| 1300 | DMERR("aborting resume - crypt key is not set."); |
| 1301 | return -EAGAIN; |
| 1302 | } |
| 1303 | |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | static void crypt_resume(struct dm_target *ti) |
| 1308 | { |
| 1309 | struct crypt_config *cc = ti->private; |
| 1310 | |
| 1311 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1312 | } |
| 1313 | |
| 1314 | /* Message interface |
| 1315 | * key set <key> |
| 1316 | * key wipe |
| 1317 | */ |
| 1318 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) |
| 1319 | { |
| 1320 | struct crypt_config *cc = ti->private; |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 1321 | int ret = -EINVAL; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1322 | |
| 1323 | if (argc < 2) |
| 1324 | goto error; |
| 1325 | |
| 1326 | if (!strnicmp(argv[0], MESG_STR("key"))) { |
| 1327 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
| 1328 | DMWARN("not suspended during key manipulation."); |
| 1329 | return -EINVAL; |
| 1330 | } |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 1331 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) { |
| 1332 | ret = crypt_set_key(cc, argv[2]); |
| 1333 | if (ret) |
| 1334 | return ret; |
| 1335 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) |
| 1336 | ret = cc->iv_gen_ops->init(cc); |
| 1337 | return ret; |
| 1338 | } |
| 1339 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) { |
| 1340 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
| 1341 | ret = cc->iv_gen_ops->wipe(cc); |
| 1342 | if (ret) |
| 1343 | return ret; |
| 1344 | } |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1345 | return crypt_wipe_key(cc); |
Milan Broz | 542da31 | 2009-12-10 23:51:57 +0000 | [diff] [blame] | 1346 | } |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1347 | } |
| 1348 | |
| 1349 | error: |
| 1350 | DMWARN("unrecognised message received."); |
| 1351 | return -EINVAL; |
| 1352 | } |
| 1353 | |
Milan Broz | d41e26b | 2008-07-21 12:00:40 +0100 | [diff] [blame] | 1354 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| 1355 | struct bio_vec *biovec, int max_size) |
| 1356 | { |
| 1357 | struct crypt_config *cc = ti->private; |
| 1358 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); |
| 1359 | |
| 1360 | if (!q->merge_bvec_fn) |
| 1361 | return max_size; |
| 1362 | |
| 1363 | bvm->bi_bdev = cc->dev->bdev; |
| 1364 | bvm->bi_sector = cc->start + bvm->bi_sector - ti->begin; |
| 1365 | |
| 1366 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); |
| 1367 | } |
| 1368 | |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 1369 | static int crypt_iterate_devices(struct dm_target *ti, |
| 1370 | iterate_devices_callout_fn fn, void *data) |
| 1371 | { |
| 1372 | struct crypt_config *cc = ti->private; |
| 1373 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 1374 | return fn(ti, cc->dev, cc->start, ti->len, data); |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 1375 | } |
| 1376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | static struct target_type crypt_target = { |
| 1378 | .name = "crypt", |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 1379 | .version = {1, 7, 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | .module = THIS_MODULE, |
| 1381 | .ctr = crypt_ctr, |
| 1382 | .dtr = crypt_dtr, |
| 1383 | .map = crypt_map, |
| 1384 | .status = crypt_status, |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1385 | .postsuspend = crypt_postsuspend, |
| 1386 | .preresume = crypt_preresume, |
| 1387 | .resume = crypt_resume, |
| 1388 | .message = crypt_message, |
Milan Broz | d41e26b | 2008-07-21 12:00:40 +0100 | [diff] [blame] | 1389 | .merge = crypt_merge, |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 1390 | .iterate_devices = crypt_iterate_devices, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | }; |
| 1392 | |
| 1393 | static int __init dm_crypt_init(void) |
| 1394 | { |
| 1395 | int r; |
| 1396 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1397 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | if (!_crypt_io_pool) |
| 1399 | return -ENOMEM; |
| 1400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | r = dm_register_target(&crypt_target); |
| 1402 | if (r < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1403 | DMERR("register failed %d", r); |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1404 | kmem_cache_destroy(_crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | return r; |
| 1408 | } |
| 1409 | |
| 1410 | static void __exit dm_crypt_exit(void) |
| 1411 | { |
Mikulas Patocka | 10d3bd0 | 2009-01-06 03:04:58 +0000 | [diff] [blame] | 1412 | dm_unregister_target(&crypt_target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | kmem_cache_destroy(_crypt_io_pool); |
| 1414 | } |
| 1415 | |
| 1416 | module_init(dm_crypt_init); |
| 1417 | module_exit(dm_crypt_exit); |
| 1418 | |
| 1419 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); |
| 1420 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
| 1421 | MODULE_LICENSE("GPL"); |