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 | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 4 | * Copyright (C) 2006-2008 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 | |
| 26 | #include "dm.h" |
| 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 | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 59 | }; |
| 60 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 61 | struct dm_crypt_request { |
| 62 | struct scatterlist sg_in; |
| 63 | struct scatterlist sg_out; |
| 64 | }; |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | struct crypt_config; |
| 67 | |
| 68 | struct crypt_iv_operations { |
| 69 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 70 | const char *opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | void (*dtr)(struct crypt_config *cc); |
| 72 | const char *(*status)(struct crypt_config *cc); |
| 73 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Crypt: maps a linear range of a block device |
| 78 | * and encrypts / decrypts at the same time. |
| 79 | */ |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 80 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | struct crypt_config { |
| 82 | struct dm_dev *dev; |
| 83 | sector_t start; |
| 84 | |
| 85 | /* |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 86 | * pool for per bio private data, crypto requests and |
| 87 | * encryption requeusts/buffer pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | */ |
| 89 | mempool_t *io_pool; |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 90 | mempool_t *req_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | mempool_t *page_pool; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 92 | struct bio_set *bs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 94 | struct workqueue_struct *io_queue; |
| 95 | struct workqueue_struct *crypt_queue; |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 96 | wait_queue_head_t writeq; |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* |
| 99 | * crypto related data |
| 100 | */ |
| 101 | struct crypt_iv_operations *iv_gen_ops; |
| 102 | char *iv_mode; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 103 | union { |
| 104 | struct crypto_cipher *essiv_tfm; |
| 105 | int benbi_shift; |
| 106 | } iv_gen_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | sector_t iv_offset; |
| 108 | unsigned int iv_size; |
| 109 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 110 | /* |
| 111 | * Layout of each crypto request: |
| 112 | * |
| 113 | * struct ablkcipher_request |
| 114 | * context |
| 115 | * padding |
| 116 | * struct dm_crypt_request |
| 117 | * padding |
| 118 | * IV |
| 119 | * |
| 120 | * The padding is added so that dm_crypt_request and the IV are |
| 121 | * correctly aligned. |
| 122 | */ |
| 123 | unsigned int dmreq_start; |
| 124 | struct ablkcipher_request *req; |
| 125 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 126 | char cipher[CRYPTO_MAX_ALG_NAME]; |
| 127 | char chainmode[CRYPTO_MAX_ALG_NAME]; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 128 | struct crypto_ablkcipher *tfm; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 129 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | unsigned int key_size; |
| 131 | u8 key[0]; |
| 132 | }; |
| 133 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 134 | #define MIN_IOS 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #define MIN_POOL_PAGES 32 |
| 136 | #define MIN_BIO_PAGES 8 |
| 137 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 138 | static struct kmem_cache *_crypt_io_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 140 | static void clone_init(struct dm_crypt_io *, struct bio *); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 141 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | * Different IV generation algorithms: |
| 145 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 146 | * 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] | 147 | * number, padded with zeros if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 149 | * essiv: "encrypted sector|salt initial vector", the sector number is |
| 150 | * encrypted with the bulk cipher using a salt as key. The salt |
| 151 | * should be derived from the bulk cipher's key via hashing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | * |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 153 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
| 154 | * (needed for LRW-32-AES and possible other narrow block modes) |
| 155 | * |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 156 | * null: the initial vector is always zero. Provides compatibility with |
| 157 | * obsolete loop_fish2 devices. Do not use for new devices. |
| 158 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | * plumb: unimplemented, see: |
| 160 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 |
| 161 | */ |
| 162 | |
| 163 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 164 | { |
| 165 | memset(iv, 0, cc->iv_size); |
| 166 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | 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] | 172 | const char *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 174 | struct crypto_cipher *essiv_tfm; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 175 | struct crypto_hash *hash_tfm; |
| 176 | struct hash_desc desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | struct scatterlist sg; |
| 178 | unsigned int saltsize; |
| 179 | u8 *salt; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 180 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | if (opts == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 183 | ti->error = "Digest algorithm missing for ESSIV mode"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return -EINVAL; |
| 185 | } |
| 186 | |
| 187 | /* Hash the cipher key with the given hash algorithm */ |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 188 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
| 189 | if (IS_ERR(hash_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 190 | ti->error = "Error initializing ESSIV hash"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 191 | return PTR_ERR(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 194 | saltsize = crypto_hash_digestsize(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | salt = kmalloc(saltsize, GFP_KERNEL); |
| 196 | if (salt == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 197 | ti->error = "Error kmallocing salt storage in ESSIV"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 198 | crypto_free_hash(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | return -ENOMEM; |
| 200 | } |
| 201 | |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 202 | sg_init_one(&sg, cc->key, cc->key_size); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 203 | desc.tfm = hash_tfm; |
| 204 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 205 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); |
| 206 | crypto_free_hash(hash_tfm); |
| 207 | |
| 208 | if (err) { |
| 209 | ti->error = "Error calculating hash in ESSIV"; |
Dmitry Monakhov | 815f9e3 | 2007-10-19 22:38:38 +0100 | [diff] [blame] | 210 | kfree(salt); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 211 | return err; |
| 212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | /* Setup the essiv_tfm with the given salt */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 215 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 216 | if (IS_ERR(essiv_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 217 | ti->error = "Error allocating crypto tfm for ESSIV"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 219 | return PTR_ERR(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 221 | if (crypto_cipher_blocksize(essiv_tfm) != |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 222 | crypto_ablkcipher_ivsize(cc->tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 223 | ti->error = "Block size of ESSIV cipher does " |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 224 | "not match IV size of block cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 225 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | kfree(salt); |
| 227 | return -EINVAL; |
| 228 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 229 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
| 230 | if (err) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 231 | ti->error = "Failed to set key for ESSIV cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 232 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 234 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | kfree(salt); |
| 237 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 238 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
| 243 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 244 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
| 245 | cc->iv_gen_private.essiv_tfm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 249 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | memset(iv, 0, cc->iv_size); |
| 251 | *(u64 *)iv = cpu_to_le64(sector); |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 252 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 256 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 257 | const char *opts) |
| 258 | { |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 259 | unsigned bs = crypto_ablkcipher_blocksize(cc->tfm); |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 260 | int log = ilog2(bs); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 261 | |
| 262 | /* we need to calculate how far we must shift the sector count |
| 263 | * to get the cipher block count, we use this shift in _gen */ |
| 264 | |
| 265 | if (1 << log != bs) { |
| 266 | ti->error = "cypher blocksize is not a power of 2"; |
| 267 | return -EINVAL; |
| 268 | } |
| 269 | |
| 270 | if (log > 9) { |
| 271 | ti->error = "cypher blocksize is > 512"; |
| 272 | return -EINVAL; |
| 273 | } |
| 274 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 275 | cc->iv_gen_private.benbi_shift = 9 - log; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) |
| 281 | { |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 285 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 286 | __be64 val; |
| 287 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 288 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 289 | |
| 290 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); |
| 291 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | return 0; |
| 294 | } |
| 295 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 296 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 297 | { |
| 298 | memset(iv, 0, cc->iv_size); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
| 304 | .generator = crypt_iv_plain_gen |
| 305 | }; |
| 306 | |
| 307 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
| 308 | .ctr = crypt_iv_essiv_ctr, |
| 309 | .dtr = crypt_iv_essiv_dtr, |
| 310 | .generator = crypt_iv_essiv_gen |
| 311 | }; |
| 312 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 313 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
| 314 | .ctr = crypt_iv_benbi_ctr, |
| 315 | .dtr = crypt_iv_benbi_dtr, |
| 316 | .generator = crypt_iv_benbi_gen |
| 317 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 319 | static struct crypt_iv_operations crypt_iv_null_ops = { |
| 320 | .generator = crypt_iv_null_gen |
| 321 | }; |
| 322 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 323 | static void crypt_convert_init(struct crypt_config *cc, |
| 324 | struct convert_context *ctx, |
| 325 | struct bio *bio_out, struct bio *bio_in, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 326 | sector_t sector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | ctx->bio_in = bio_in; |
| 329 | ctx->bio_out = bio_out; |
| 330 | ctx->offset_in = 0; |
| 331 | ctx->offset_out = 0; |
| 332 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; |
| 333 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; |
| 334 | ctx->sector = sector + cc->iv_offset; |
Milan Broz | 43d6903 | 2008-02-08 02:11:09 +0000 | [diff] [blame] | 335 | init_completion(&ctx->restart); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 336 | atomic_set(&ctx->pending, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 339 | static int crypt_convert_block(struct crypt_config *cc, |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 340 | struct convert_context *ctx, |
| 341 | struct ablkcipher_request *req) |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 342 | { |
| 343 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); |
| 344 | 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] | 345 | struct dm_crypt_request *dmreq; |
| 346 | u8 *iv; |
| 347 | int r = 0; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 348 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 349 | dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start); |
| 350 | iv = (u8 *)ALIGN((unsigned long)(dmreq + 1), |
| 351 | crypto_ablkcipher_alignmask(cc->tfm) + 1); |
| 352 | |
| 353 | sg_init_table(&dmreq->sg_in, 1); |
| 354 | 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] | 355 | bv_in->bv_offset + ctx->offset_in); |
| 356 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 357 | sg_init_table(&dmreq->sg_out, 1); |
| 358 | 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] | 359 | bv_out->bv_offset + ctx->offset_out); |
| 360 | |
| 361 | ctx->offset_in += 1 << SECTOR_SHIFT; |
| 362 | if (ctx->offset_in >= bv_in->bv_len) { |
| 363 | ctx->offset_in = 0; |
| 364 | ctx->idx_in++; |
| 365 | } |
| 366 | |
| 367 | ctx->offset_out += 1 << SECTOR_SHIFT; |
| 368 | if (ctx->offset_out >= bv_out->bv_len) { |
| 369 | ctx->offset_out = 0; |
| 370 | ctx->idx_out++; |
| 371 | } |
| 372 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 373 | if (cc->iv_gen_ops) { |
| 374 | r = cc->iv_gen_ops->generator(cc, iv, ctx->sector); |
| 375 | if (r < 0) |
| 376 | return r; |
| 377 | } |
| 378 | |
| 379 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, |
| 380 | 1 << SECTOR_SHIFT, iv); |
| 381 | |
| 382 | if (bio_data_dir(ctx->bio_in) == WRITE) |
| 383 | r = crypto_ablkcipher_encrypt(req); |
| 384 | else |
| 385 | r = crypto_ablkcipher_decrypt(req); |
| 386 | |
| 387 | return r; |
Milan Broz | 01482b7 | 2008-02-08 02:11:04 +0000 | [diff] [blame] | 388 | } |
| 389 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 390 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 391 | int error); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 392 | static void crypt_alloc_req(struct crypt_config *cc, |
| 393 | struct convert_context *ctx) |
| 394 | { |
| 395 | if (!cc->req) |
| 396 | cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 397 | ablkcipher_request_set_tfm(cc->req, cc->tfm); |
| 398 | ablkcipher_request_set_callback(cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG | |
| 399 | CRYPTO_TFM_REQ_MAY_SLEEP, |
| 400 | kcryptd_async_done, ctx); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 401 | } |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | /* |
| 404 | * Encrypt / decrypt data from one bio to another one (can be the same one) |
| 405 | */ |
| 406 | static int crypt_convert(struct crypt_config *cc, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 407 | struct convert_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | { |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 409 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
| 412 | ctx->idx_out < ctx->bio_out->bi_vcnt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 414 | crypt_alloc_req(cc, ctx); |
| 415 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 416 | atomic_inc(&ctx->pending); |
| 417 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 418 | r = crypt_convert_block(cc, ctx, cc->req); |
| 419 | |
| 420 | switch (r) { |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 421 | /* async */ |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 422 | case -EBUSY: |
| 423 | wait_for_completion(&ctx->restart); |
| 424 | INIT_COMPLETION(ctx->restart); |
| 425 | /* fall through*/ |
| 426 | case -EINPROGRESS: |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 427 | cc->req = NULL; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 428 | ctx->sector++; |
| 429 | continue; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 430 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 431 | /* sync */ |
| 432 | case 0: |
| 433 | atomic_dec(&ctx->pending); |
| 434 | ctx->sector++; |
Milan Broz | c7f1b20 | 2008-07-02 09:34:28 +0100 | [diff] [blame] | 435 | cond_resched(); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 436 | continue; |
| 437 | |
| 438 | /* error */ |
| 439 | default: |
| 440 | atomic_dec(&ctx->pending); |
| 441 | return r; |
| 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 445 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 448 | static void dm_crypt_bio_destructor(struct bio *bio) |
| 449 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 450 | struct dm_crypt_io *io = bio->bi_private; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 451 | struct crypt_config *cc = io->target->private; |
| 452 | |
| 453 | bio_free(bio, cc->bs); |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 454 | } |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | /* |
| 457 | * Generate a new unfragmented bio with the given size |
| 458 | * This should never violate the device limitations |
| 459 | * May return a smaller bio when running out of pages |
| 460 | */ |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 461 | 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] | 462 | { |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 463 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 464 | struct bio *clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Al Viro | b4e3ca1 | 2005-10-21 03:22:34 -0400 | [diff] [blame] | 466 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 467 | unsigned i, len; |
| 468 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 470 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 471 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 474 | clone_init(io, clone); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 475 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 476 | for (i = 0; i < nr_iovecs; i++) { |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 477 | page = mempool_alloc(cc->page_pool, gfp_mask); |
| 478 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | break; |
| 480 | |
| 481 | /* |
| 482 | * if additional pages cannot be allocated without waiting, |
| 483 | * return a partially allocated bio, the caller will then try |
| 484 | * to allocate additional bios while submitting this partial bio |
| 485 | */ |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 486 | if (i == (MIN_BIO_PAGES - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
| 488 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 489 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 491 | if (!bio_add_page(clone, page, len, 0)) { |
| 492 | mempool_free(page, cc->page_pool); |
| 493 | break; |
| 494 | } |
| 495 | |
| 496 | size -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 499 | if (!clone->bi_size) { |
| 500 | bio_put(clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | return NULL; |
| 502 | } |
| 503 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 504 | return clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 507 | 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] | 508 | { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 509 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | struct bio_vec *bv; |
| 511 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 512 | for (i = 0; i < clone->bi_vcnt; i++) { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 513 | bv = bio_iovec_idx(clone, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | BUG_ON(!bv->bv_page); |
| 515 | mempool_free(bv->bv_page, cc->page_pool); |
| 516 | bv->bv_page = NULL; |
| 517 | } |
| 518 | } |
| 519 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 520 | static void crypt_inc_pending(struct dm_crypt_io *io) |
| 521 | { |
| 522 | atomic_inc(&io->pending); |
| 523 | } |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* |
| 526 | * One of the bios was finished. Check for completion of |
| 527 | * the whole request and correctly clean up the buffer. |
| 528 | */ |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 529 | static void crypt_dec_pending(struct dm_crypt_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 531 | struct crypt_config *cc = io->target->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | if (!atomic_dec_and_test(&io->pending)) |
| 534 | return; |
| 535 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 536 | bio_endio(io->base_bio, io->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | mempool_free(io, cc->io_pool); |
| 538 | } |
| 539 | |
| 540 | /* |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 541 | * kcryptd/kcryptd_io: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | * |
| 543 | * Needed because it would be very unwise to do decryption in an |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 544 | * interrupt context. |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 545 | * |
| 546 | * kcryptd performs the actual encryption or decryption. |
| 547 | * |
| 548 | * kcryptd_io performs the IO submission. |
| 549 | * |
| 550 | * They must be separated as otherwise the final stages could be |
| 551 | * starved by new requests which can block in the first stages due |
| 552 | * to memory allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | */ |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 554 | static void crypt_endio(struct bio *clone, int error) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 555 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 556 | struct dm_crypt_io *io = clone->bi_private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 557 | struct crypt_config *cc = io->target->private; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 558 | unsigned rw = bio_data_dir(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 559 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 560 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
| 561 | error = -EIO; |
| 562 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 563 | /* |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 564 | * free the processed pages |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 565 | */ |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 566 | if (rw == WRITE) |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 567 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 568 | |
| 569 | bio_put(clone); |
| 570 | |
| 571 | if (rw == READ && !error) { |
| 572 | kcryptd_queue_crypt(io); |
| 573 | return; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 574 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 575 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 576 | if (unlikely(error)) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 577 | io->error = error; |
| 578 | |
| 579 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 580 | } |
| 581 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 582 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 583 | { |
| 584 | struct crypt_config *cc = io->target->private; |
| 585 | |
| 586 | clone->bi_private = io; |
| 587 | clone->bi_end_io = crypt_endio; |
| 588 | clone->bi_bdev = cc->dev->bdev; |
| 589 | clone->bi_rw = io->base_bio->bi_rw; |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 590 | clone->bi_destructor = dm_crypt_bio_destructor; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 591 | } |
| 592 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 593 | static void kcryptd_io_read(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 594 | { |
| 595 | struct crypt_config *cc = io->target->private; |
| 596 | struct bio *base_bio = io->base_bio; |
| 597 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 598 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 599 | crypt_inc_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 600 | |
| 601 | /* |
| 602 | * The block layer might modify the bvec array, so always |
| 603 | * copy the required bvecs because we need the original |
| 604 | * one in order to decrypt the whole bio data *afterwards*. |
| 605 | */ |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 606 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 607 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 608 | io->error = -ENOMEM; |
| 609 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 610 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 611 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 612 | |
| 613 | clone_init(io, clone); |
| 614 | clone->bi_idx = 0; |
| 615 | clone->bi_vcnt = bio_segments(base_bio); |
| 616 | clone->bi_size = base_bio->bi_size; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 617 | clone->bi_sector = cc->start + io->sector; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 618 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
| 619 | sizeof(struct bio_vec) * clone->bi_vcnt); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 620 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 621 | generic_make_request(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 622 | } |
| 623 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 624 | static void kcryptd_io_write(struct dm_crypt_io *io) |
| 625 | { |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 626 | struct bio *clone = io->ctx.bio_out; |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 627 | struct crypt_config *cc = io->target->private; |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 628 | |
| 629 | generic_make_request(clone); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 630 | wake_up(&cc->writeq); |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 631 | } |
| 632 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 633 | static void kcryptd_io(struct work_struct *work) |
| 634 | { |
| 635 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 636 | |
| 637 | if (bio_data_dir(io->base_bio) == READ) |
| 638 | kcryptd_io_read(io); |
| 639 | else |
| 640 | kcryptd_io_write(io); |
| 641 | } |
| 642 | |
| 643 | static void kcryptd_queue_io(struct dm_crypt_io *io) |
| 644 | { |
| 645 | struct crypt_config *cc = io->target->private; |
| 646 | |
| 647 | INIT_WORK(&io->work, kcryptd_io); |
| 648 | queue_work(cc->io_queue, &io->work); |
| 649 | } |
| 650 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 651 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, |
| 652 | int error, int async) |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 653 | { |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 654 | struct bio *clone = io->ctx.bio_out; |
| 655 | struct crypt_config *cc = io->target->private; |
| 656 | |
| 657 | if (unlikely(error < 0)) { |
| 658 | crypt_free_buffer_pages(cc, clone); |
| 659 | bio_put(clone); |
| 660 | io->error = -EIO; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 661 | return; |
| 662 | } |
| 663 | |
| 664 | /* crypt_convert should have filled the clone bio */ |
| 665 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); |
| 666 | |
| 667 | clone->bi_sector = cc->start + io->sector; |
| 668 | io->sector += bio_sectors(clone); |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 669 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 670 | if (async) |
| 671 | kcryptd_queue_io(io); |
| 672 | else { |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 673 | crypt_inc_pending(io); |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 674 | generic_make_request(clone); |
| 675 | } |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 676 | } |
| 677 | |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 678 | static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 679 | { |
| 680 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 681 | struct bio *clone; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 682 | unsigned remaining = io->base_bio->bi_size; |
| 683 | int r; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 684 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 685 | /* |
| 686 | * The allocated buffers can be smaller than the whole bio, |
| 687 | * so repeat the whole process until all the data can be handled. |
| 688 | */ |
| 689 | while (remaining) { |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 690 | clone = crypt_alloc_buffer(io, remaining); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 691 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 692 | io->error = -ENOMEM; |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 693 | return; |
| 694 | } |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 695 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 696 | io->ctx.bio_out = clone; |
| 697 | io->ctx.idx_out = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 698 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 699 | remaining -= clone->bi_size; |
Milan Broz | dec1ced | 2008-02-08 02:10:57 +0000 | [diff] [blame] | 700 | |
| 701 | r = crypt_convert(cc, &io->ctx); |
| 702 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 703 | if (atomic_dec_and_test(&io->ctx.pending)) { |
| 704 | /* processed, no running async crypto */ |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 705 | kcryptd_crypt_write_io_submit(io, r, 0); |
| 706 | if (unlikely(r < 0)) |
| 707 | return; |
| 708 | } else |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 709 | crypt_inc_pending(io); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 710 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 711 | /* out of memory -> run queues */ |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 712 | if (unlikely(remaining)) { |
| 713 | /* wait for async crypto then reinitialize pending */ |
| 714 | wait_event(cc->writeq, !atomic_read(&io->ctx.pending)); |
| 715 | atomic_set(&io->ctx.pending, 1); |
Olaf Kirch | 98221eb | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 716 | congestion_wait(WRITE, HZ/100); |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 717 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 718 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 721 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
| 722 | { |
| 723 | struct crypt_config *cc = io->target->private; |
| 724 | |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 725 | /* |
| 726 | * Prevent io from disappearing until this function completes. |
| 727 | */ |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 728 | crypt_inc_pending(io); |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 729 | |
| 730 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, io->sector); |
| 731 | kcryptd_crypt_write_convert_loop(io); |
Milan Broz | 899c95d | 2008-02-08 02:11:02 +0000 | [diff] [blame] | 732 | |
| 733 | crypt_dec_pending(io); |
Milan Broz | 84131db | 2008-02-08 02:10:59 +0000 | [diff] [blame] | 734 | } |
| 735 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 736 | 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] | 737 | { |
| 738 | if (unlikely(error < 0)) |
| 739 | io->error = -EIO; |
| 740 | |
| 741 | crypt_dec_pending(io); |
| 742 | } |
| 743 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 744 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 745 | { |
| 746 | struct crypt_config *cc = io->target->private; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 747 | int r = 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 748 | |
Milan Broz | 3e1a8bd | 2008-10-10 13:37:02 +0100 | [diff] [blame^] | 749 | crypt_inc_pending(io); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 750 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 751 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 752 | io->sector); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 753 | |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 754 | r = crypt_convert(cc, &io->ctx); |
| 755 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 756 | if (atomic_dec_and_test(&io->ctx.pending)) |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 757 | kcryptd_crypt_read_done(io, r); |
| 758 | |
| 759 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Milan Broz | 95497a9 | 2008-02-08 02:11:12 +0000 | [diff] [blame] | 762 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
| 763 | int error) |
| 764 | { |
| 765 | struct convert_context *ctx = async_req->data; |
| 766 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
| 767 | struct crypt_config *cc = io->target->private; |
| 768 | |
| 769 | if (error == -EINPROGRESS) { |
| 770 | complete(&ctx->restart); |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | mempool_free(ablkcipher_request_cast(async_req), cc->req_pool); |
| 775 | |
| 776 | if (!atomic_dec_and_test(&ctx->pending)) |
| 777 | return; |
| 778 | |
| 779 | if (bio_data_dir(io->base_bio) == READ) |
| 780 | kcryptd_crypt_read_done(io, error); |
| 781 | else |
| 782 | kcryptd_crypt_write_io_submit(io, error, 1); |
| 783 | } |
| 784 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 785 | static void kcryptd_crypt(struct work_struct *work) |
| 786 | { |
| 787 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 788 | |
| 789 | if (bio_data_dir(io->base_bio) == READ) |
| 790 | kcryptd_crypt_read_convert(io); |
| 791 | else |
| 792 | kcryptd_crypt_write_convert(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame] | 795 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
| 796 | { |
| 797 | struct crypt_config *cc = io->target->private; |
| 798 | |
| 799 | INIT_WORK(&io->work, kcryptd_crypt); |
| 800 | queue_work(cc->crypt_queue, &io->work); |
| 801 | } |
| 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | /* |
| 804 | * Decode key from its hex representation |
| 805 | */ |
| 806 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) |
| 807 | { |
| 808 | char buffer[3]; |
| 809 | char *endp; |
| 810 | unsigned int i; |
| 811 | |
| 812 | buffer[2] = '\0'; |
| 813 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 814 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | buffer[0] = *hex++; |
| 816 | buffer[1] = *hex++; |
| 817 | |
| 818 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); |
| 819 | |
| 820 | if (endp != &buffer[2]) |
| 821 | return -EINVAL; |
| 822 | } |
| 823 | |
| 824 | if (*hex != '\0') |
| 825 | return -EINVAL; |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * Encode key into its hex representation |
| 832 | */ |
| 833 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) |
| 834 | { |
| 835 | unsigned int i; |
| 836 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 837 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | sprintf(hex, "%02x", *key); |
| 839 | hex += 2; |
| 840 | key++; |
| 841 | } |
| 842 | } |
| 843 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 844 | static int crypt_set_key(struct crypt_config *cc, char *key) |
| 845 | { |
| 846 | unsigned key_size = strlen(key) >> 1; |
| 847 | |
| 848 | if (cc->key_size && cc->key_size != key_size) |
| 849 | return -EINVAL; |
| 850 | |
| 851 | cc->key_size = key_size; /* initial settings */ |
| 852 | |
| 853 | if ((!key_size && strcmp(key, "-")) || |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 854 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 855 | return -EINVAL; |
| 856 | |
| 857 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 858 | |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | static int crypt_wipe_key(struct crypt_config *cc) |
| 863 | { |
| 864 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 865 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
| 866 | return 0; |
| 867 | } |
| 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | /* |
| 870 | * Construct an encryption mapping: |
| 871 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 872 | */ |
| 873 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 874 | { |
| 875 | struct crypt_config *cc; |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 876 | struct crypto_ablkcipher *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | char *tmp; |
| 878 | char *cipher; |
| 879 | char *chainmode; |
| 880 | char *ivmode; |
| 881 | char *ivopts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | unsigned int key_size; |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 883 | unsigned long long tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
| 885 | if (argc != 5) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 886 | ti->error = "Not enough arguments"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | return -EINVAL; |
| 888 | } |
| 889 | |
| 890 | tmp = argv[0]; |
| 891 | cipher = strsep(&tmp, "-"); |
| 892 | chainmode = strsep(&tmp, "-"); |
| 893 | ivopts = strsep(&tmp, "-"); |
| 894 | ivmode = strsep(&ivopts, ":"); |
| 895 | |
| 896 | if (tmp) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 897 | DMWARN("Unexpected additional cipher options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
| 899 | key_size = strlen(argv[1]) >> 1; |
| 900 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 901 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | if (cc == NULL) { |
| 903 | ti->error = |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 904 | "Cannot allocate transparent encryption context"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | return -ENOMEM; |
| 906 | } |
| 907 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 908 | if (crypt_set_key(cc, argv[1])) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 909 | ti->error = "Error decoding key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 910 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | /* Compatiblity mode for old dm-crypt cipher strings */ |
| 914 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { |
| 915 | chainmode = "cbc"; |
| 916 | ivmode = "plain"; |
| 917 | } |
| 918 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 919 | if (strcmp(chainmode, "ecb") && !ivmode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 920 | ti->error = "This chaining mode requires an IV mechanism"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 921 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
| 923 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 924 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
| 925 | chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 926 | ti->error = "Chain mode + cipher name is too long"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 927 | goto bad_cipher; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 928 | } |
| 929 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 930 | tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 931 | if (IS_ERR(tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 932 | ti->error = "Error allocating crypto tfm"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 933 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 936 | strcpy(cc->cipher, cipher); |
| 937 | strcpy(cc->chainmode, chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | cc->tfm = tfm; |
| 939 | |
| 940 | /* |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 941 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | * See comments at iv code |
| 943 | */ |
| 944 | |
| 945 | if (ivmode == NULL) |
| 946 | cc->iv_gen_ops = NULL; |
| 947 | else if (strcmp(ivmode, "plain") == 0) |
| 948 | cc->iv_gen_ops = &crypt_iv_plain_ops; |
| 949 | else if (strcmp(ivmode, "essiv") == 0) |
| 950 | cc->iv_gen_ops = &crypt_iv_essiv_ops; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 951 | else if (strcmp(ivmode, "benbi") == 0) |
| 952 | cc->iv_gen_ops = &crypt_iv_benbi_ops; |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 953 | else if (strcmp(ivmode, "null") == 0) |
| 954 | cc->iv_gen_ops = &crypt_iv_null_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | else { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 956 | ti->error = "Invalid IV mode"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 957 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && |
| 961 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 962 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 964 | cc->iv_size = crypto_ablkcipher_ivsize(tfm); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 965 | if (cc->iv_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | /* at least a 64 bit sector number should fit in our buffer */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 967 | cc->iv_size = max(cc->iv_size, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 968 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (cc->iv_gen_ops) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 971 | DMWARN("Selected cipher does not support IVs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | if (cc->iv_gen_ops->dtr) |
| 973 | cc->iv_gen_ops->dtr(cc); |
| 974 | cc->iv_gen_ops = NULL; |
| 975 | } |
| 976 | } |
| 977 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 978 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | if (!cc->io_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 980 | ti->error = "Cannot allocate crypt io mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 981 | goto bad_slab_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | } |
| 983 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 984 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 985 | cc->dmreq_start += crypto_ablkcipher_reqsize(tfm); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 986 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 987 | cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) & |
| 988 | ~(crypto_tfm_ctx_alignment() - 1); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 989 | |
| 990 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + |
| 991 | sizeof(struct dm_crypt_request) + cc->iv_size); |
| 992 | if (!cc->req_pool) { |
| 993 | ti->error = "Cannot allocate crypt request mempool"; |
| 994 | goto bad_req_pool; |
| 995 | } |
| 996 | cc->req = NULL; |
| 997 | |
Matthew Dobson | a19b27c | 2006-03-26 01:37:45 -0800 | [diff] [blame] | 998 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | if (!cc->page_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1000 | ti->error = "Cannot allocate page mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1001 | goto bad_page_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Jens Axboe | 5972511 | 2007-04-02 10:06:42 +0200 | [diff] [blame] | 1004 | cc->bs = bioset_create(MIN_IOS, MIN_IOS); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1005 | if (!cc->bs) { |
| 1006 | ti->error = "Cannot allocate crypt bioset"; |
| 1007 | goto bad_bs; |
| 1008 | } |
| 1009 | |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1010 | if (crypto_ablkcipher_setkey(tfm, cc->key, key_size) < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1011 | ti->error = "Error setting key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1012 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | } |
| 1014 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1015 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1016 | ti->error = "Invalid iv_offset sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1017 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1019 | cc->iv_offset = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1021 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1022 | ti->error = "Invalid device sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1023 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1025 | cc->start = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
| 1027 | if (dm_get_device(ti, argv[3], cc->start, ti->len, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 1028 | dm_table_get_mode(ti->table), &cc->dev)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1029 | ti->error = "Device lookup failed"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1030 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | } |
| 1032 | |
| 1033 | if (ivmode && cc->iv_gen_ops) { |
| 1034 | if (ivopts) |
| 1035 | *(ivopts - 1) = ':'; |
| 1036 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); |
| 1037 | if (!cc->iv_mode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1038 | ti->error = "Error kmallocing iv_mode string"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1039 | goto bad_ivmode_string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | } |
| 1041 | strcpy(cc->iv_mode, ivmode); |
| 1042 | } else |
| 1043 | cc->iv_mode = NULL; |
| 1044 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1045 | cc->io_queue = create_singlethread_workqueue("kcryptd_io"); |
| 1046 | if (!cc->io_queue) { |
| 1047 | ti->error = "Couldn't create kcryptd io queue"; |
| 1048 | goto bad_io_queue; |
| 1049 | } |
| 1050 | |
| 1051 | cc->crypt_queue = create_singlethread_workqueue("kcryptd"); |
| 1052 | if (!cc->crypt_queue) { |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1053 | ti->error = "Couldn't create kcryptd queue"; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1054 | goto bad_crypt_queue; |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1055 | } |
| 1056 | |
Milan Broz | 3f1e907 | 2008-03-28 14:16:07 -0700 | [diff] [blame] | 1057 | init_waitqueue_head(&cc->writeq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | ti->private = cc; |
| 1059 | return 0; |
| 1060 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1061 | bad_crypt_queue: |
| 1062 | destroy_workqueue(cc->io_queue); |
| 1063 | bad_io_queue: |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1064 | kfree(cc->iv_mode); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1065 | bad_ivmode_string: |
Dmitry Monakhov | 55b42c5 | 2007-10-19 22:38:37 +0100 | [diff] [blame] | 1066 | dm_put_device(ti, cc->dev); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1067 | bad_device: |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1068 | bioset_free(cc->bs); |
| 1069 | bad_bs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | mempool_destroy(cc->page_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1071 | bad_page_pool: |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1072 | mempool_destroy(cc->req_pool); |
| 1073 | bad_req_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | mempool_destroy(cc->io_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1075 | bad_slab_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1077 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1078 | bad_ivmode: |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1079 | crypto_free_ablkcipher(tfm); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 1080 | bad_cipher: |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1081 | /* Must zero key material before freeing */ |
| 1082 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | kfree(cc); |
| 1084 | return -EINVAL; |
| 1085 | } |
| 1086 | |
| 1087 | static void crypt_dtr(struct dm_target *ti) |
| 1088 | { |
| 1089 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
| 1090 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1091 | destroy_workqueue(cc->io_queue); |
| 1092 | destroy_workqueue(cc->crypt_queue); |
Milan Broz | 80b16c1 | 2007-07-21 04:37:27 -0700 | [diff] [blame] | 1093 | |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1094 | if (cc->req) |
| 1095 | mempool_free(cc->req, cc->req_pool); |
| 1096 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 1097 | bioset_free(cc->bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | mempool_destroy(cc->page_pool); |
Milan Broz | ddd42ed | 2008-02-08 02:11:07 +0000 | [diff] [blame] | 1099 | mempool_destroy(cc->req_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | mempool_destroy(cc->io_pool); |
| 1101 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 1102 | kfree(cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 1104 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 3a7f6c9 | 2008-02-08 02:11:14 +0000 | [diff] [blame] | 1105 | crypto_free_ablkcipher(cc->tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | dm_put_device(ti, cc->dev); |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 1107 | |
| 1108 | /* Must zero key material before freeing */ |
| 1109 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | kfree(cc); |
| 1111 | } |
| 1112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
| 1114 | union map_info *map_context) |
| 1115 | { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1116 | struct crypt_config *cc = ti->private; |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1117 | struct dm_crypt_io *io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1119 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | io->target = ti; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1121 | io->base_bio = bio; |
Milan Broz | 0c395b0 | 2008-02-08 02:10:54 +0000 | [diff] [blame] | 1122 | io->sector = bio->bi_sector - ti->begin; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1123 | io->error = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 1124 | atomic_set(&io->pending, 0); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 1125 | |
| 1126 | if (bio_data_dir(io->base_bio) == READ) |
| 1127 | kcryptd_queue_io(io); |
| 1128 | else |
| 1129 | kcryptd_queue_crypt(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 1131 | return DM_MAPIO_SUBMITTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
| 1134 | static int crypt_status(struct dm_target *ti, status_type_t type, |
| 1135 | char *result, unsigned int maxlen) |
| 1136 | { |
| 1137 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | unsigned int sz = 0; |
| 1139 | |
| 1140 | switch (type) { |
| 1141 | case STATUSTYPE_INFO: |
| 1142 | result[0] = '\0'; |
| 1143 | break; |
| 1144 | |
| 1145 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | if (cc->iv_mode) |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1147 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
| 1148 | cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | else |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1150 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | |
| 1152 | if (cc->key_size > 0) { |
| 1153 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) |
| 1154 | return -ENOMEM; |
| 1155 | |
| 1156 | crypt_encode_key(result + sz, cc->key, cc->key_size); |
| 1157 | sz += cc->key_size << 1; |
| 1158 | } else { |
| 1159 | if (sz >= maxlen) |
| 1160 | return -ENOMEM; |
| 1161 | result[sz++] = '-'; |
| 1162 | } |
| 1163 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1164 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
| 1165 | cc->dev->name, (unsigned long long)cc->start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | break; |
| 1167 | } |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1171 | static void crypt_postsuspend(struct dm_target *ti) |
| 1172 | { |
| 1173 | struct crypt_config *cc = ti->private; |
| 1174 | |
| 1175 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1176 | } |
| 1177 | |
| 1178 | static int crypt_preresume(struct dm_target *ti) |
| 1179 | { |
| 1180 | struct crypt_config *cc = ti->private; |
| 1181 | |
| 1182 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { |
| 1183 | DMERR("aborting resume - crypt key is not set."); |
| 1184 | return -EAGAIN; |
| 1185 | } |
| 1186 | |
| 1187 | return 0; |
| 1188 | } |
| 1189 | |
| 1190 | static void crypt_resume(struct dm_target *ti) |
| 1191 | { |
| 1192 | struct crypt_config *cc = ti->private; |
| 1193 | |
| 1194 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1195 | } |
| 1196 | |
| 1197 | /* Message interface |
| 1198 | * key set <key> |
| 1199 | * key wipe |
| 1200 | */ |
| 1201 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) |
| 1202 | { |
| 1203 | struct crypt_config *cc = ti->private; |
| 1204 | |
| 1205 | if (argc < 2) |
| 1206 | goto error; |
| 1207 | |
| 1208 | if (!strnicmp(argv[0], MESG_STR("key"))) { |
| 1209 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
| 1210 | DMWARN("not suspended during key manipulation."); |
| 1211 | return -EINVAL; |
| 1212 | } |
| 1213 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) |
| 1214 | return crypt_set_key(cc, argv[2]); |
| 1215 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) |
| 1216 | return crypt_wipe_key(cc); |
| 1217 | } |
| 1218 | |
| 1219 | error: |
| 1220 | DMWARN("unrecognised message received."); |
| 1221 | return -EINVAL; |
| 1222 | } |
| 1223 | |
Milan Broz | d41e26b | 2008-07-21 12:00:40 +0100 | [diff] [blame] | 1224 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| 1225 | struct bio_vec *biovec, int max_size) |
| 1226 | { |
| 1227 | struct crypt_config *cc = ti->private; |
| 1228 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); |
| 1229 | |
| 1230 | if (!q->merge_bvec_fn) |
| 1231 | return max_size; |
| 1232 | |
| 1233 | bvm->bi_bdev = cc->dev->bdev; |
| 1234 | bvm->bi_sector = cc->start + bvm->bi_sector - ti->begin; |
| 1235 | |
| 1236 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); |
| 1237 | } |
| 1238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | static struct target_type crypt_target = { |
| 1240 | .name = "crypt", |
Milan Broz | d41e26b | 2008-07-21 12:00:40 +0100 | [diff] [blame] | 1241 | .version= {1, 6, 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | .module = THIS_MODULE, |
| 1243 | .ctr = crypt_ctr, |
| 1244 | .dtr = crypt_dtr, |
| 1245 | .map = crypt_map, |
| 1246 | .status = crypt_status, |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1247 | .postsuspend = crypt_postsuspend, |
| 1248 | .preresume = crypt_preresume, |
| 1249 | .resume = crypt_resume, |
| 1250 | .message = crypt_message, |
Milan Broz | d41e26b | 2008-07-21 12:00:40 +0100 | [diff] [blame] | 1251 | .merge = crypt_merge, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | }; |
| 1253 | |
| 1254 | static int __init dm_crypt_init(void) |
| 1255 | { |
| 1256 | int r; |
| 1257 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1258 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | if (!_crypt_io_pool) |
| 1260 | return -ENOMEM; |
| 1261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | r = dm_register_target(&crypt_target); |
| 1263 | if (r < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1264 | DMERR("register failed %d", r); |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1265 | kmem_cache_destroy(_crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | } |
| 1267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | return r; |
| 1269 | } |
| 1270 | |
| 1271 | static void __exit dm_crypt_exit(void) |
| 1272 | { |
| 1273 | int r = dm_unregister_target(&crypt_target); |
| 1274 | |
| 1275 | if (r < 0) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1276 | DMERR("unregister failed %d", r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | kmem_cache_destroy(_crypt_io_pool); |
| 1279 | } |
| 1280 | |
| 1281 | module_init(dm_crypt_init); |
| 1282 | module_exit(dm_crypt_exit); |
| 1283 | |
| 1284 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); |
| 1285 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
| 1286 | MODULE_LICENSE("GPL"); |