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 | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 4 | * Copyright (C) 2006-2007 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 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 9 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/bio.h> |
| 14 | #include <linux/blkdev.h> |
| 15 | #include <linux/mempool.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/crypto.h> |
| 18 | #include <linux/workqueue.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 19 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/atomic.h> |
David Hardeman | 378f058 | 2005-09-17 17:55:31 +1000 | [diff] [blame] | 21 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/page.h> |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 23 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include "dm.h" |
| 26 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 27 | #define DM_MSG_PREFIX "crypt" |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 28 | #define MESG_STR(x) x, sizeof(x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * context holding the current state of a multi-part conversion |
| 32 | */ |
| 33 | struct convert_context { |
| 34 | struct bio *bio_in; |
| 35 | struct bio *bio_out; |
| 36 | unsigned int offset_in; |
| 37 | unsigned int offset_out; |
| 38 | unsigned int idx_in; |
| 39 | unsigned int idx_out; |
| 40 | sector_t sector; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 43 | /* |
| 44 | * per bio private data |
| 45 | */ |
| 46 | struct dm_crypt_io { |
| 47 | struct dm_target *target; |
| 48 | struct bio *base_bio; |
| 49 | struct work_struct work; |
| 50 | |
| 51 | struct convert_context ctx; |
| 52 | |
| 53 | atomic_t pending; |
| 54 | int error; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 55 | sector_t sector; |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 56 | }; |
| 57 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 58 | struct dm_crypt_request { |
| 59 | struct scatterlist sg_in; |
| 60 | struct scatterlist sg_out; |
| 61 | }; |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | struct crypt_config; |
| 64 | |
| 65 | struct crypt_iv_operations { |
| 66 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 67 | const char *opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | void (*dtr)(struct crypt_config *cc); |
| 69 | const char *(*status)(struct crypt_config *cc); |
| 70 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); |
| 71 | }; |
| 72 | |
| 73 | /* |
| 74 | * Crypt: maps a linear range of a block device |
| 75 | * and encrypts / decrypts at the same time. |
| 76 | */ |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 77 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | struct crypt_config { |
| 79 | struct dm_dev *dev; |
| 80 | sector_t start; |
| 81 | |
| 82 | /* |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 83 | * pool for per bio private data, crypto requests and |
| 84 | * encryption requeusts/buffer pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | */ |
| 86 | mempool_t *io_pool; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 87 | mempool_t *req_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | mempool_t *page_pool; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 89 | struct bio_set *bs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 91 | struct workqueue_struct *io_queue; |
| 92 | struct workqueue_struct *crypt_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | /* |
| 94 | * crypto related data |
| 95 | */ |
| 96 | struct crypt_iv_operations *iv_gen_ops; |
| 97 | char *iv_mode; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 98 | union { |
| 99 | struct crypto_cipher *essiv_tfm; |
| 100 | int benbi_shift; |
| 101 | } iv_gen_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | sector_t iv_offset; |
| 103 | unsigned int iv_size; |
| 104 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 105 | /* |
| 106 | * Layout of each crypto request: |
| 107 | * |
| 108 | * struct ablkcipher_request |
| 109 | * context |
| 110 | * padding |
| 111 | * struct dm_crypt_request |
| 112 | * padding |
| 113 | * IV |
| 114 | * |
| 115 | * The padding is added so that dm_crypt_request and the IV are |
| 116 | * correctly aligned. |
| 117 | */ |
| 118 | unsigned int dmreq_start; |
| 119 | struct ablkcipher_request *req; |
| 120 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 121 | char cipher[CRYPTO_MAX_ALG_NAME]; |
| 122 | char chainmode[CRYPTO_MAX_ALG_NAME]; |
| 123 | struct crypto_blkcipher *tfm; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 124 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | unsigned int key_size; |
| 126 | u8 key[0]; |
| 127 | }; |
| 128 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 129 | #define MIN_IOS 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #define MIN_POOL_PAGES 32 |
| 131 | #define MIN_BIO_PAGES 8 |
| 132 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 133 | static struct kmem_cache *_crypt_io_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 135 | static void clone_init(struct dm_crypt_io *, struct bio *); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 136 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | * Different IV generation algorithms: |
| 140 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 141 | * 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] | 142 | * number, padded with zeros if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 144 | * essiv: "encrypted sector|salt initial vector", the sector number is |
| 145 | * encrypted with the bulk cipher using a salt as key. The salt |
| 146 | * should be derived from the bulk cipher's key via hashing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | * |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 148 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
| 149 | * (needed for LRW-32-AES and possible other narrow block modes) |
| 150 | * |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 151 | * null: the initial vector is always zero. Provides compatibility with |
| 152 | * obsolete loop_fish2 devices. Do not use for new devices. |
| 153 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | * plumb: unimplemented, see: |
| 155 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 |
| 156 | */ |
| 157 | |
| 158 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 159 | { |
| 160 | memset(iv, 0, cc->iv_size); |
| 161 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | 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] | 167 | const char *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 169 | struct crypto_cipher *essiv_tfm; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 170 | struct crypto_hash *hash_tfm; |
| 171 | struct hash_desc desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | struct scatterlist sg; |
| 173 | unsigned int saltsize; |
| 174 | u8 *salt; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 175 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | if (opts == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 178 | ti->error = "Digest algorithm missing for ESSIV mode"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return -EINVAL; |
| 180 | } |
| 181 | |
| 182 | /* Hash the cipher key with the given hash algorithm */ |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 183 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
| 184 | if (IS_ERR(hash_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 185 | ti->error = "Error initializing ESSIV hash"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 186 | return PTR_ERR(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 189 | saltsize = crypto_hash_digestsize(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | salt = kmalloc(saltsize, GFP_KERNEL); |
| 191 | if (salt == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 192 | ti->error = "Error kmallocing salt storage in ESSIV"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 193 | crypto_free_hash(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | return -ENOMEM; |
| 195 | } |
| 196 | |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 197 | sg_init_one(&sg, cc->key, cc->key_size); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 198 | desc.tfm = hash_tfm; |
| 199 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 200 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); |
| 201 | crypto_free_hash(hash_tfm); |
| 202 | |
| 203 | if (err) { |
| 204 | ti->error = "Error calculating hash in ESSIV"; |
Dmitry Monakhov | 815f9e3 | 2007-10-19 22:38:38 +0100 | [diff] [blame] | 205 | kfree(salt); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 206 | return err; |
| 207 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | /* Setup the essiv_tfm with the given salt */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 210 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 211 | if (IS_ERR(essiv_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 212 | ti->error = "Error allocating crypto tfm for ESSIV"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 214 | return PTR_ERR(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 216 | if (crypto_cipher_blocksize(essiv_tfm) != |
| 217 | crypto_blkcipher_ivsize(cc->tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 218 | ti->error = "Block size of ESSIV cipher does " |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 219 | "not match IV size of block cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 220 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | kfree(salt); |
| 222 | return -EINVAL; |
| 223 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 224 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
| 225 | if (err) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 226 | ti->error = "Failed to set key for ESSIV cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 227 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 229 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | kfree(salt); |
| 232 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 233 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
| 238 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 239 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
| 240 | cc->iv_gen_private.essiv_tfm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 244 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | memset(iv, 0, cc->iv_size); |
| 246 | *(u64 *)iv = cpu_to_le64(sector); |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 247 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | return 0; |
| 249 | } |
| 250 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 251 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 252 | const char *opts) |
| 253 | { |
| 254 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 255 | int log = ilog2(bs); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 256 | |
| 257 | /* we need to calculate how far we must shift the sector count |
| 258 | * to get the cipher block count, we use this shift in _gen */ |
| 259 | |
| 260 | if (1 << log != bs) { |
| 261 | ti->error = "cypher blocksize is not a power of 2"; |
| 262 | return -EINVAL; |
| 263 | } |
| 264 | |
| 265 | if (log > 9) { |
| 266 | ti->error = "cypher blocksize is > 512"; |
| 267 | return -EINVAL; |
| 268 | } |
| 269 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 270 | cc->iv_gen_private.benbi_shift = 9 - log; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) |
| 276 | { |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 280 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 281 | __be64 val; |
| 282 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 283 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 284 | |
| 285 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); |
| 286 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | return 0; |
| 289 | } |
| 290 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 291 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 292 | { |
| 293 | memset(iv, 0, cc->iv_size); |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
| 299 | .generator = crypt_iv_plain_gen |
| 300 | }; |
| 301 | |
| 302 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
| 303 | .ctr = crypt_iv_essiv_ctr, |
| 304 | .dtr = crypt_iv_essiv_dtr, |
| 305 | .generator = crypt_iv_essiv_gen |
| 306 | }; |
| 307 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 308 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
| 309 | .ctr = crypt_iv_benbi_ctr, |
| 310 | .dtr = crypt_iv_benbi_dtr, |
| 311 | .generator = crypt_iv_benbi_gen |
| 312 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 314 | static struct crypt_iv_operations crypt_iv_null_ops = { |
| 315 | .generator = crypt_iv_null_gen |
| 316 | }; |
| 317 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 318 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
| 320 | struct scatterlist *in, unsigned int length, |
| 321 | int write, sector_t sector) |
| 322 | { |
Herbert Xu | 4578932 | 2006-09-03 08:58:41 +1000 | [diff] [blame] | 323 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 324 | struct blkcipher_desc desc = { |
| 325 | .tfm = cc->tfm, |
| 326 | .info = iv, |
| 327 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, |
| 328 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | int r; |
| 330 | |
| 331 | if (cc->iv_gen_ops) { |
| 332 | r = cc->iv_gen_ops->generator(cc, iv, sector); |
| 333 | if (r < 0) |
| 334 | return r; |
| 335 | |
| 336 | if (write) |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 337 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | else |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 339 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } else { |
| 341 | if (write) |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 342 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | else |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 344 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | return r; |
| 348 | } |
| 349 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 350 | static void crypt_convert_init(struct crypt_config *cc, |
| 351 | struct convert_context *ctx, |
| 352 | struct bio *bio_out, struct bio *bio_in, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 353 | sector_t sector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | ctx->bio_in = bio_in; |
| 356 | ctx->bio_out = bio_out; |
| 357 | ctx->offset_in = 0; |
| 358 | ctx->offset_out = 0; |
| 359 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; |
| 360 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; |
| 361 | ctx->sector = sector + cc->iv_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 364 | static int crypt_convert_block(struct crypt_config *cc, |
| 365 | struct convert_context *ctx) |
| 366 | { |
| 367 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); |
| 368 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); |
| 369 | struct dm_crypt_request dmreq; |
| 370 | |
| 371 | sg_init_table(&dmreq.sg_in, 1); |
| 372 | sg_set_page(&dmreq.sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, |
| 373 | bv_in->bv_offset + ctx->offset_in); |
| 374 | |
| 375 | sg_init_table(&dmreq.sg_out, 1); |
| 376 | sg_set_page(&dmreq.sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, |
| 377 | bv_out->bv_offset + ctx->offset_out); |
| 378 | |
| 379 | ctx->offset_in += 1 << SECTOR_SHIFT; |
| 380 | if (ctx->offset_in >= bv_in->bv_len) { |
| 381 | ctx->offset_in = 0; |
| 382 | ctx->idx_in++; |
| 383 | } |
| 384 | |
| 385 | ctx->offset_out += 1 << SECTOR_SHIFT; |
| 386 | if (ctx->offset_out >= bv_out->bv_len) { |
| 387 | ctx->offset_out = 0; |
| 388 | ctx->idx_out++; |
| 389 | } |
| 390 | |
| 391 | return crypt_convert_scatterlist(cc, &dmreq.sg_out, &dmreq.sg_in, |
| 392 | dmreq.sg_in.length, |
| 393 | bio_data_dir(ctx->bio_in) == WRITE, |
| 394 | ctx->sector); |
| 395 | } |
| 396 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 397 | static void crypt_alloc_req(struct crypt_config *cc, |
| 398 | struct convert_context *ctx) |
| 399 | { |
| 400 | if (!cc->req) |
| 401 | cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); |
| 402 | } |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | /* |
| 405 | * Encrypt / decrypt data from one bio to another one (can be the same one) |
| 406 | */ |
| 407 | static int crypt_convert(struct crypt_config *cc, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 408 | struct convert_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
| 410 | int r = 0; |
| 411 | |
| 412 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
| 413 | ctx->idx_out < ctx->bio_out->bi_vcnt) { |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 414 | r = crypt_convert_block(cc, ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (r < 0) |
| 416 | break; |
| 417 | |
| 418 | ctx->sector++; |
| 419 | } |
| 420 | |
| 421 | return r; |
| 422 | } |
| 423 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 424 | static void dm_crypt_bio_destructor(struct bio *bio) |
| 425 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 426 | struct dm_crypt_io *io = bio->bi_private; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 427 | struct crypt_config *cc = io->target->private; |
| 428 | |
| 429 | bio_free(bio, cc->bs); |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 430 | } |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | /* |
| 433 | * Generate a new unfragmented bio with the given size |
| 434 | * This should never violate the device limitations |
| 435 | * May return a smaller bio when running out of pages |
| 436 | */ |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 437 | 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] | 438 | { |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 439 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 440 | struct bio *clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Al Viro | b4e3ca1 | 2005-10-21 03:22:34 -0400 | [diff] [blame] | 442 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 443 | unsigned i, len; |
| 444 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 446 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 447 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 450 | clone_init(io, clone); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 451 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 452 | for (i = 0; i < nr_iovecs; i++) { |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 453 | page = mempool_alloc(cc->page_pool, gfp_mask); |
| 454 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | break; |
| 456 | |
| 457 | /* |
| 458 | * if additional pages cannot be allocated without waiting, |
| 459 | * return a partially allocated bio, the caller will then try |
| 460 | * to allocate additional bios while submitting this partial bio |
| 461 | */ |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 462 | if (i == (MIN_BIO_PAGES - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
| 464 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 465 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 467 | if (!bio_add_page(clone, page, len, 0)) { |
| 468 | mempool_free(page, cc->page_pool); |
| 469 | break; |
| 470 | } |
| 471 | |
| 472 | size -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 475 | if (!clone->bi_size) { |
| 476 | bio_put(clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return NULL; |
| 478 | } |
| 479 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 480 | return clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 483 | 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] | 484 | { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 485 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | struct bio_vec *bv; |
| 487 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 488 | for (i = 0; i < clone->bi_vcnt; i++) { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 489 | bv = bio_iovec_idx(clone, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | BUG_ON(!bv->bv_page); |
| 491 | mempool_free(bv->bv_page, cc->page_pool); |
| 492 | bv->bv_page = NULL; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * One of the bios was finished. Check for completion of |
| 498 | * the whole request and correctly clean up the buffer. |
| 499 | */ |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 500 | static void crypt_dec_pending(struct dm_crypt_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 502 | struct crypt_config *cc = io->target->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | if (!atomic_dec_and_test(&io->pending)) |
| 505 | return; |
| 506 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 507 | bio_endio(io->base_bio, io->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | mempool_free(io, cc->io_pool); |
| 509 | } |
| 510 | |
| 511 | /* |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 512 | * kcryptd/kcryptd_io: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | * |
| 514 | * Needed because it would be very unwise to do decryption in an |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 515 | * interrupt context. |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 516 | * |
| 517 | * kcryptd performs the actual encryption or decryption. |
| 518 | * |
| 519 | * kcryptd_io performs the IO submission. |
| 520 | * |
| 521 | * They must be separated as otherwise the final stages could be |
| 522 | * starved by new requests which can block in the first stages due |
| 523 | * to memory allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | */ |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 525 | static void crypt_endio(struct bio *clone, int error) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 526 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 527 | struct dm_crypt_io *io = clone->bi_private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 528 | struct crypt_config *cc = io->target->private; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 529 | unsigned rw = bio_data_dir(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 530 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 531 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
| 532 | error = -EIO; |
| 533 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 534 | /* |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 535 | * free the processed pages |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 536 | */ |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 537 | if (rw == WRITE) |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 538 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 539 | |
| 540 | bio_put(clone); |
| 541 | |
| 542 | if (rw == READ && !error) { |
| 543 | kcryptd_queue_crypt(io); |
| 544 | return; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 545 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 546 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 547 | if (unlikely(error)) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 548 | io->error = error; |
| 549 | |
| 550 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 553 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 554 | { |
| 555 | struct crypt_config *cc = io->target->private; |
| 556 | |
| 557 | clone->bi_private = io; |
| 558 | clone->bi_end_io = crypt_endio; |
| 559 | clone->bi_bdev = cc->dev->bdev; |
| 560 | clone->bi_rw = io->base_bio->bi_rw; |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 561 | clone->bi_destructor = dm_crypt_bio_destructor; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 562 | } |
| 563 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 564 | static void kcryptd_io_read(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 565 | { |
| 566 | struct crypt_config *cc = io->target->private; |
| 567 | struct bio *base_bio = io->base_bio; |
| 568 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 569 | |
| 570 | atomic_inc(&io->pending); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 571 | |
| 572 | /* |
| 573 | * The block layer might modify the bvec array, so always |
| 574 | * copy the required bvecs because we need the original |
| 575 | * one in order to decrypt the whole bio data *afterwards*. |
| 576 | */ |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 577 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 578 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 579 | io->error = -ENOMEM; |
| 580 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 581 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 582 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 583 | |
| 584 | clone_init(io, clone); |
| 585 | clone->bi_idx = 0; |
| 586 | clone->bi_vcnt = bio_segments(base_bio); |
| 587 | clone->bi_size = base_bio->bi_size; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 588 | clone->bi_sector = cc->start + io->sector; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 589 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
| 590 | sizeof(struct bio_vec) * clone->bi_vcnt); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 591 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 592 | generic_make_request(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 595 | static void kcryptd_io_write(struct dm_crypt_io *io) |
| 596 | { |
| 597 | } |
| 598 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 599 | static void kcryptd_io(struct work_struct *work) |
| 600 | { |
| 601 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 602 | |
| 603 | if (bio_data_dir(io->base_bio) == READ) |
| 604 | kcryptd_io_read(io); |
| 605 | else |
| 606 | kcryptd_io_write(io); |
| 607 | } |
| 608 | |
| 609 | static void kcryptd_queue_io(struct dm_crypt_io *io) |
| 610 | { |
| 611 | struct crypt_config *cc = io->target->private; |
| 612 | |
| 613 | INIT_WORK(&io->work, kcryptd_io); |
| 614 | queue_work(cc->io_queue, &io->work); |
| 615 | } |
| 616 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 617 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error) |
| 618 | { |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 619 | struct bio *clone = io->ctx.bio_out; |
| 620 | struct crypt_config *cc = io->target->private; |
| 621 | |
| 622 | if (unlikely(error < 0)) { |
| 623 | crypt_free_buffer_pages(cc, clone); |
| 624 | bio_put(clone); |
| 625 | io->error = -EIO; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 626 | return; |
| 627 | } |
| 628 | |
| 629 | /* crypt_convert should have filled the clone bio */ |
| 630 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); |
| 631 | |
| 632 | clone->bi_sector = cc->start + io->sector; |
| 633 | io->sector += bio_sectors(clone); |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 634 | |
| 635 | atomic_inc(&io->pending); |
| 636 | generic_make_request(clone); |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 637 | } |
| 638 | |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 639 | static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 640 | { |
| 641 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 642 | struct bio *clone; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 643 | unsigned remaining = io->base_bio->bi_size; |
| 644 | int r; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 645 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 646 | /* |
| 647 | * The allocated buffers can be smaller than the whole bio, |
| 648 | * so repeat the whole process until all the data can be handled. |
| 649 | */ |
| 650 | while (remaining) { |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 651 | clone = crypt_alloc_buffer(io, remaining); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 652 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 653 | io->error = -ENOMEM; |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 654 | return; |
| 655 | } |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 656 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 657 | io->ctx.bio_out = clone; |
| 658 | io->ctx.idx_out = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 659 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 660 | remaining -= clone->bi_size; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 661 | |
| 662 | r = crypt_convert(cc, &io->ctx); |
| 663 | |
| 664 | kcryptd_crypt_write_io_submit(io, r); |
| 665 | if (unlikely(r < 0)) |
| 666 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 667 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 668 | /* out of memory -> run queues */ |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 669 | if (unlikely(remaining)) |
Olaf Kirch | 98221eb | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 670 | congestion_wait(WRITE, HZ/100); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 671 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 672 | } |
| 673 | |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 674 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
| 675 | { |
| 676 | struct crypt_config *cc = io->target->private; |
| 677 | |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 678 | /* |
| 679 | * Prevent io from disappearing until this function completes. |
| 680 | */ |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 681 | atomic_inc(&io->pending); |
| 682 | |
| 683 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, io->sector); |
| 684 | kcryptd_crypt_write_convert_loop(io); |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 685 | |
| 686 | crypt_dec_pending(io); |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 687 | } |
| 688 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 689 | 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] | 690 | { |
| 691 | if (unlikely(error < 0)) |
| 692 | io->error = -EIO; |
| 693 | |
| 694 | crypt_dec_pending(io); |
| 695 | } |
| 696 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 697 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 698 | { |
| 699 | struct crypt_config *cc = io->target->private; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 700 | int r = 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 701 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 702 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 703 | io->sector); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 704 | |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 705 | r = crypt_convert(cc, &io->ctx); |
| 706 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 707 | kcryptd_crypt_read_done(io, r); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 708 | } |
| 709 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 710 | static void kcryptd_crypt(struct work_struct *work) |
| 711 | { |
| 712 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 713 | |
| 714 | if (bio_data_dir(io->base_bio) == READ) |
| 715 | kcryptd_crypt_read_convert(io); |
| 716 | else |
| 717 | kcryptd_crypt_write_convert(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 718 | } |
| 719 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 720 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
| 721 | { |
| 722 | struct crypt_config *cc = io->target->private; |
| 723 | |
| 724 | INIT_WORK(&io->work, kcryptd_crypt); |
| 725 | queue_work(cc->crypt_queue, &io->work); |
| 726 | } |
| 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | /* |
| 729 | * Decode key from its hex representation |
| 730 | */ |
| 731 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) |
| 732 | { |
| 733 | char buffer[3]; |
| 734 | char *endp; |
| 735 | unsigned int i; |
| 736 | |
| 737 | buffer[2] = '\0'; |
| 738 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 739 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | buffer[0] = *hex++; |
| 741 | buffer[1] = *hex++; |
| 742 | |
| 743 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); |
| 744 | |
| 745 | if (endp != &buffer[2]) |
| 746 | return -EINVAL; |
| 747 | } |
| 748 | |
| 749 | if (*hex != '\0') |
| 750 | return -EINVAL; |
| 751 | |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * Encode key into its hex representation |
| 757 | */ |
| 758 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) |
| 759 | { |
| 760 | unsigned int i; |
| 761 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 762 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | sprintf(hex, "%02x", *key); |
| 764 | hex += 2; |
| 765 | key++; |
| 766 | } |
| 767 | } |
| 768 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 769 | static int crypt_set_key(struct crypt_config *cc, char *key) |
| 770 | { |
| 771 | unsigned key_size = strlen(key) >> 1; |
| 772 | |
| 773 | if (cc->key_size && cc->key_size != key_size) |
| 774 | return -EINVAL; |
| 775 | |
| 776 | cc->key_size = key_size; /* initial settings */ |
| 777 | |
| 778 | if ((!key_size && strcmp(key, "-")) || |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 779 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 780 | return -EINVAL; |
| 781 | |
| 782 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | static int crypt_wipe_key(struct crypt_config *cc) |
| 788 | { |
| 789 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 790 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
| 791 | return 0; |
| 792 | } |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | /* |
| 795 | * Construct an encryption mapping: |
| 796 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 797 | */ |
| 798 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 799 | { |
| 800 | struct crypt_config *cc; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 801 | struct crypto_blkcipher *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | char *tmp; |
| 803 | char *cipher; |
| 804 | char *chainmode; |
| 805 | char *ivmode; |
| 806 | char *ivopts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | unsigned int key_size; |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 808 | unsigned long long tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | if (argc != 5) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 811 | ti->error = "Not enough arguments"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | return -EINVAL; |
| 813 | } |
| 814 | |
| 815 | tmp = argv[0]; |
| 816 | cipher = strsep(&tmp, "-"); |
| 817 | chainmode = strsep(&tmp, "-"); |
| 818 | ivopts = strsep(&tmp, "-"); |
| 819 | ivmode = strsep(&ivopts, ":"); |
| 820 | |
| 821 | if (tmp) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 822 | DMWARN("Unexpected additional cipher options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | key_size = strlen(argv[1]) >> 1; |
| 825 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 826 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | if (cc == NULL) { |
| 828 | ti->error = |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 829 | "Cannot allocate transparent encryption context"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return -ENOMEM; |
| 831 | } |
| 832 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 833 | if (crypt_set_key(cc, argv[1])) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 834 | ti->error = "Error decoding key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 835 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | /* Compatiblity mode for old dm-crypt cipher strings */ |
| 839 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { |
| 840 | chainmode = "cbc"; |
| 841 | ivmode = "plain"; |
| 842 | } |
| 843 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 844 | if (strcmp(chainmode, "ecb") && !ivmode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 845 | ti->error = "This chaining mode requires an IV mechanism"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 846 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 849 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
| 850 | chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 851 | ti->error = "Chain mode + cipher name is too long"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 852 | goto bad_cipher; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 853 | } |
| 854 | |
| 855 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 856 | if (IS_ERR(tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 857 | ti->error = "Error allocating crypto tfm"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 858 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 861 | strcpy(cc->cipher, cipher); |
| 862 | strcpy(cc->chainmode, chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | cc->tfm = tfm; |
| 864 | |
| 865 | /* |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 866 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | * See comments at iv code |
| 868 | */ |
| 869 | |
| 870 | if (ivmode == NULL) |
| 871 | cc->iv_gen_ops = NULL; |
| 872 | else if (strcmp(ivmode, "plain") == 0) |
| 873 | cc->iv_gen_ops = &crypt_iv_plain_ops; |
| 874 | else if (strcmp(ivmode, "essiv") == 0) |
| 875 | cc->iv_gen_ops = &crypt_iv_essiv_ops; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 876 | else if (strcmp(ivmode, "benbi") == 0) |
| 877 | cc->iv_gen_ops = &crypt_iv_benbi_ops; |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 878 | else if (strcmp(ivmode, "null") == 0) |
| 879 | cc->iv_gen_ops = &crypt_iv_null_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | else { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 881 | ti->error = "Invalid IV mode"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 882 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && |
| 886 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 887 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 889 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
| 890 | if (cc->iv_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | /* at least a 64 bit sector number should fit in our buffer */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 892 | cc->iv_size = max(cc->iv_size, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 893 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | if (cc->iv_gen_ops) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 896 | DMWARN("Selected cipher does not support IVs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (cc->iv_gen_ops->dtr) |
| 898 | cc->iv_gen_ops->dtr(cc); |
| 899 | cc->iv_gen_ops = NULL; |
| 900 | } |
| 901 | } |
| 902 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 903 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | if (!cc->io_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 905 | ti->error = "Cannot allocate crypt io mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 906 | goto bad_slab_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 909 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
| 910 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
| 911 | |
| 912 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
| 913 | sizeof(struct dm_crypt_request) + cc->iv_size); |
| 914 | if (!cc->req_pool) { |
| 915 | ti->error = "Cannot allocate crypt request mempool"; |
| 916 | goto bad_req_pool; |
| 917 | } |
| 918 | cc->req = NULL; |
| 919 | |
Matthew Dobson | a19b27c | 2006-03-26 01:37:45 -0800 | [diff] [blame] | 920 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | if (!cc->page_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 922 | ti->error = "Cannot allocate page mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 923 | goto bad_page_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
Jens Axboe | 5972511 | 2007-04-02 10:06:42 +0200 | [diff] [blame] | 926 | cc->bs = bioset_create(MIN_IOS, MIN_IOS); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 927 | if (!cc->bs) { |
| 928 | ti->error = "Cannot allocate crypt bioset"; |
| 929 | goto bad_bs; |
| 930 | } |
| 931 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 932 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 933 | ti->error = "Error setting key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 934 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | } |
| 936 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 937 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 938 | ti->error = "Invalid iv_offset sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 939 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 941 | cc->iv_offset = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 943 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 944 | ti->error = "Invalid device sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 945 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 947 | cc->start = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
| 949 | if (dm_get_device(ti, argv[3], cc->start, ti->len, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 950 | dm_table_get_mode(ti->table), &cc->dev)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 951 | ti->error = "Device lookup failed"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 952 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | if (ivmode && cc->iv_gen_ops) { |
| 956 | if (ivopts) |
| 957 | *(ivopts - 1) = ':'; |
| 958 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); |
| 959 | if (!cc->iv_mode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 960 | ti->error = "Error kmallocing iv_mode string"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 961 | goto bad_ivmode_string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | } |
| 963 | strcpy(cc->iv_mode, ivmode); |
| 964 | } else |
| 965 | cc->iv_mode = NULL; |
| 966 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 967 | cc->io_queue = create_singlethread_workqueue("kcryptd_io"); |
| 968 | if (!cc->io_queue) { |
| 969 | ti->error = "Couldn't create kcryptd io queue"; |
| 970 | goto bad_io_queue; |
| 971 | } |
| 972 | |
| 973 | cc->crypt_queue = create_singlethread_workqueue("kcryptd"); |
| 974 | if (!cc->crypt_queue) { |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 975 | ti->error = "Couldn't create kcryptd queue"; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 976 | goto bad_crypt_queue; |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 977 | } |
| 978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | ti->private = cc; |
| 980 | return 0; |
| 981 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 982 | bad_crypt_queue: |
| 983 | destroy_workqueue(cc->io_queue); |
| 984 | bad_io_queue: |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 985 | kfree(cc->iv_mode); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 986 | bad_ivmode_string: |
Dmitry Monakhov | 55b42c5 | 2007-10-19 22:38:37 +0100 | [diff] [blame] | 987 | dm_put_device(ti, cc->dev); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 988 | bad_device: |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 989 | bioset_free(cc->bs); |
| 990 | bad_bs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | mempool_destroy(cc->page_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 992 | bad_page_pool: |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 993 | mempool_destroy(cc->req_pool); |
| 994 | bad_req_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | mempool_destroy(cc->io_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 996 | bad_slab_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 998 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 999 | bad_ivmode: |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1000 | crypto_free_blkcipher(tfm); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1001 | bad_cipher: |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1002 | /* Must zero key material before freeing */ |
| 1003 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | kfree(cc); |
| 1005 | return -EINVAL; |
| 1006 | } |
| 1007 | |
| 1008 | static void crypt_dtr(struct dm_target *ti) |
| 1009 | { |
| 1010 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
| 1011 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1012 | destroy_workqueue(cc->io_queue); |
| 1013 | destroy_workqueue(cc->crypt_queue); |
Milan Broz | 80b16c1 | 2007-07-21 04:37:27 -0700 | [diff] [blame] | 1014 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 1015 | if (cc->req) |
| 1016 | mempool_free(cc->req, cc->req_pool); |
| 1017 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1018 | bioset_free(cc->bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | mempool_destroy(cc->page_pool); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame^] | 1020 | mempool_destroy(cc->req_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | mempool_destroy(cc->io_pool); |
| 1022 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 1023 | kfree(cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1025 | cc->iv_gen_ops->dtr(cc); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 1026 | crypto_free_blkcipher(cc->tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | dm_put_device(ti, cc->dev); |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1028 | |
| 1029 | /* Must zero key material before freeing */ |
| 1030 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | kfree(cc); |
| 1032 | } |
| 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
| 1035 | union map_info *map_context) |
| 1036 | { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1037 | struct crypt_config *cc = ti->private; |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1038 | struct dm_crypt_io *io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1040 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | io->target = ti; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1042 | io->base_bio = bio; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 1043 | io->sector = bio->bi_sector - ti->begin; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1044 | io->error = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 1045 | atomic_set(&io->pending, 0); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1046 | |
| 1047 | if (bio_data_dir(io->base_bio) == READ) |
| 1048 | kcryptd_queue_io(io); |
| 1049 | else |
| 1050 | kcryptd_queue_crypt(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 1052 | return DM_MAPIO_SUBMITTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | static int crypt_status(struct dm_target *ti, status_type_t type, |
| 1056 | char *result, unsigned int maxlen) |
| 1057 | { |
| 1058 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | unsigned int sz = 0; |
| 1060 | |
| 1061 | switch (type) { |
| 1062 | case STATUSTYPE_INFO: |
| 1063 | result[0] = '\0'; |
| 1064 | break; |
| 1065 | |
| 1066 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | if (cc->iv_mode) |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1068 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
| 1069 | cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | else |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1071 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
| 1073 | if (cc->key_size > 0) { |
| 1074 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) |
| 1075 | return -ENOMEM; |
| 1076 | |
| 1077 | crypt_encode_key(result + sz, cc->key, cc->key_size); |
| 1078 | sz += cc->key_size << 1; |
| 1079 | } else { |
| 1080 | if (sz >= maxlen) |
| 1081 | return -ENOMEM; |
| 1082 | result[sz++] = '-'; |
| 1083 | } |
| 1084 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1085 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
| 1086 | cc->dev->name, (unsigned long long)cc->start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | break; |
| 1088 | } |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1092 | static void crypt_postsuspend(struct dm_target *ti) |
| 1093 | { |
| 1094 | struct crypt_config *cc = ti->private; |
| 1095 | |
| 1096 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1097 | } |
| 1098 | |
| 1099 | static int crypt_preresume(struct dm_target *ti) |
| 1100 | { |
| 1101 | struct crypt_config *cc = ti->private; |
| 1102 | |
| 1103 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { |
| 1104 | DMERR("aborting resume - crypt key is not set."); |
| 1105 | return -EAGAIN; |
| 1106 | } |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | static void crypt_resume(struct dm_target *ti) |
| 1112 | { |
| 1113 | struct crypt_config *cc = ti->private; |
| 1114 | |
| 1115 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1116 | } |
| 1117 | |
| 1118 | /* Message interface |
| 1119 | * key set <key> |
| 1120 | * key wipe |
| 1121 | */ |
| 1122 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) |
| 1123 | { |
| 1124 | struct crypt_config *cc = ti->private; |
| 1125 | |
| 1126 | if (argc < 2) |
| 1127 | goto error; |
| 1128 | |
| 1129 | if (!strnicmp(argv[0], MESG_STR("key"))) { |
| 1130 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
| 1131 | DMWARN("not suspended during key manipulation."); |
| 1132 | return -EINVAL; |
| 1133 | } |
| 1134 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) |
| 1135 | return crypt_set_key(cc, argv[2]); |
| 1136 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) |
| 1137 | return crypt_wipe_key(cc); |
| 1138 | } |
| 1139 | |
| 1140 | error: |
| 1141 | DMWARN("unrecognised message received."); |
| 1142 | return -EINVAL; |
| 1143 | } |
| 1144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | static struct target_type crypt_target = { |
| 1146 | .name = "crypt", |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 1147 | .version= {1, 5, 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | .module = THIS_MODULE, |
| 1149 | .ctr = crypt_ctr, |
| 1150 | .dtr = crypt_dtr, |
| 1151 | .map = crypt_map, |
| 1152 | .status = crypt_status, |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1153 | .postsuspend = crypt_postsuspend, |
| 1154 | .preresume = crypt_preresume, |
| 1155 | .resume = crypt_resume, |
| 1156 | .message = crypt_message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | }; |
| 1158 | |
| 1159 | static int __init dm_crypt_init(void) |
| 1160 | { |
| 1161 | int r; |
| 1162 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1163 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | if (!_crypt_io_pool) |
| 1165 | return -ENOMEM; |
| 1166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | r = dm_register_target(&crypt_target); |
| 1168 | if (r < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1169 | DMERR("register failed %d", r); |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1170 | kmem_cache_destroy(_crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | } |
| 1172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return r; |
| 1174 | } |
| 1175 | |
| 1176 | static void __exit dm_crypt_exit(void) |
| 1177 | { |
| 1178 | int r = dm_unregister_target(&crypt_target); |
| 1179 | |
| 1180 | if (r < 0) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1181 | DMERR("unregister failed %d", r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | kmem_cache_destroy(_crypt_io_pool); |
| 1184 | } |
| 1185 | |
| 1186 | module_init(dm_crypt_init); |
| 1187 | module_exit(dm_crypt_exit); |
| 1188 | |
| 1189 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); |
| 1190 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
| 1191 | MODULE_LICENSE("GPL"); |