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; |
| 55 | }; |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | struct crypt_config; |
| 58 | |
| 59 | struct crypt_iv_operations { |
| 60 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 61 | const char *opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | void (*dtr)(struct crypt_config *cc); |
| 63 | const char *(*status)(struct crypt_config *cc); |
| 64 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); |
| 65 | }; |
| 66 | |
| 67 | /* |
| 68 | * Crypt: maps a linear range of a block device |
| 69 | * and encrypts / decrypts at the same time. |
| 70 | */ |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 71 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | struct crypt_config { |
| 73 | struct dm_dev *dev; |
| 74 | sector_t start; |
| 75 | |
| 76 | /* |
| 77 | * pool for per bio private data and |
| 78 | * for encryption buffer pages |
| 79 | */ |
| 80 | mempool_t *io_pool; |
| 81 | mempool_t *page_pool; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 82 | struct bio_set *bs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 84 | struct workqueue_struct *io_queue; |
| 85 | struct workqueue_struct *crypt_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | /* |
| 87 | * crypto related data |
| 88 | */ |
| 89 | struct crypt_iv_operations *iv_gen_ops; |
| 90 | char *iv_mode; |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 91 | union { |
| 92 | struct crypto_cipher *essiv_tfm; |
| 93 | int benbi_shift; |
| 94 | } iv_gen_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | sector_t iv_offset; |
| 96 | unsigned int iv_size; |
| 97 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 98 | char cipher[CRYPTO_MAX_ALG_NAME]; |
| 99 | char chainmode[CRYPTO_MAX_ALG_NAME]; |
| 100 | struct crypto_blkcipher *tfm; |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 101 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | unsigned int key_size; |
| 103 | u8 key[0]; |
| 104 | }; |
| 105 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 106 | #define MIN_IOS 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #define MIN_POOL_PAGES 32 |
| 108 | #define MIN_BIO_PAGES 8 |
| 109 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 110 | static struct kmem_cache *_crypt_io_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 112 | static void clone_init(struct dm_crypt_io *, struct bio *); |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame^] | 113 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | * Different IV generation algorithms: |
| 117 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 118 | * 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] | 119 | * number, padded with zeros if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | * |
Rik Snel | 3c164bd | 2006-09-02 18:17:33 +1000 | [diff] [blame] | 121 | * essiv: "encrypted sector|salt initial vector", the sector number is |
| 122 | * encrypted with the bulk cipher using a salt as key. The salt |
| 123 | * should be derived from the bulk cipher's key via hashing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | * |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 125 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
| 126 | * (needed for LRW-32-AES and possible other narrow block modes) |
| 127 | * |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 128 | * null: the initial vector is always zero. Provides compatibility with |
| 129 | * obsolete loop_fish2 devices. Do not use for new devices. |
| 130 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | * plumb: unimplemented, see: |
| 132 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 |
| 133 | */ |
| 134 | |
| 135 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 136 | { |
| 137 | memset(iv, 0, cc->iv_size); |
| 138 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | 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] | 144 | const char *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 146 | struct crypto_cipher *essiv_tfm; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 147 | struct crypto_hash *hash_tfm; |
| 148 | struct hash_desc desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | struct scatterlist sg; |
| 150 | unsigned int saltsize; |
| 151 | u8 *salt; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 152 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | if (opts == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 155 | ti->error = "Digest algorithm missing for ESSIV mode"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | return -EINVAL; |
| 157 | } |
| 158 | |
| 159 | /* Hash the cipher key with the given hash algorithm */ |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 160 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
| 161 | if (IS_ERR(hash_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 162 | ti->error = "Error initializing ESSIV hash"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 163 | return PTR_ERR(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 166 | saltsize = crypto_hash_digestsize(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | salt = kmalloc(saltsize, GFP_KERNEL); |
| 168 | if (salt == NULL) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 169 | ti->error = "Error kmallocing salt storage in ESSIV"; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 170 | crypto_free_hash(hash_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | return -ENOMEM; |
| 172 | } |
| 173 | |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 174 | sg_init_one(&sg, cc->key, cc->key_size); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 175 | desc.tfm = hash_tfm; |
| 176 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 177 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); |
| 178 | crypto_free_hash(hash_tfm); |
| 179 | |
| 180 | if (err) { |
| 181 | ti->error = "Error calculating hash in ESSIV"; |
Dmitry Monakhov | 815f9e3 | 2007-10-19 22:38:38 +0100 | [diff] [blame] | 182 | kfree(salt); |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 183 | return err; |
| 184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | /* Setup the essiv_tfm with the given salt */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 187 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 188 | if (IS_ERR(essiv_tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 189 | ti->error = "Error allocating crypto tfm for ESSIV"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 191 | return PTR_ERR(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 193 | if (crypto_cipher_blocksize(essiv_tfm) != |
| 194 | crypto_blkcipher_ivsize(cc->tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 195 | ti->error = "Block size of ESSIV cipher does " |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 196 | "not match IV size of block cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 197 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | kfree(salt); |
| 199 | return -EINVAL; |
| 200 | } |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 201 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
| 202 | if (err) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 203 | ti->error = "Failed to set key for ESSIV cipher"; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 204 | crypto_free_cipher(essiv_tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | kfree(salt); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 206 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | kfree(salt); |
| 209 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 210 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
| 215 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 216 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
| 217 | cc->iv_gen_private.essiv_tfm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 221 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | memset(iv, 0, cc->iv_size); |
| 223 | *(u64 *)iv = cpu_to_le64(sector); |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 224 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | return 0; |
| 226 | } |
| 227 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 228 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
| 229 | const char *opts) |
| 230 | { |
| 231 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 232 | int log = ilog2(bs); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 233 | |
| 234 | /* we need to calculate how far we must shift the sector count |
| 235 | * to get the cipher block count, we use this shift in _gen */ |
| 236 | |
| 237 | if (1 << log != bs) { |
| 238 | ti->error = "cypher blocksize is not a power of 2"; |
| 239 | return -EINVAL; |
| 240 | } |
| 241 | |
| 242 | if (log > 9) { |
| 243 | ti->error = "cypher blocksize is > 512"; |
| 244 | return -EINVAL; |
| 245 | } |
| 246 | |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 247 | cc->iv_gen_private.benbi_shift = 9 - log; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) |
| 253 | { |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 257 | { |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 258 | __be64 val; |
| 259 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 260 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
Herbert Xu | 79066ad | 2006-12-05 13:41:52 -0800 | [diff] [blame] | 261 | |
| 262 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); |
| 263 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | return 0; |
| 266 | } |
| 267 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 268 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
| 269 | { |
| 270 | memset(iv, 0, cc->iv_size); |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
| 276 | .generator = crypt_iv_plain_gen |
| 277 | }; |
| 278 | |
| 279 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
| 280 | .ctr = crypt_iv_essiv_ctr, |
| 281 | .dtr = crypt_iv_essiv_dtr, |
| 282 | .generator = crypt_iv_essiv_gen |
| 283 | }; |
| 284 | |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 285 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
| 286 | .ctr = crypt_iv_benbi_ctr, |
| 287 | .dtr = crypt_iv_benbi_dtr, |
| 288 | .generator = crypt_iv_benbi_gen |
| 289 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 291 | static struct crypt_iv_operations crypt_iv_null_ops = { |
| 292 | .generator = crypt_iv_null_gen |
| 293 | }; |
| 294 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 295 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
| 297 | struct scatterlist *in, unsigned int length, |
| 298 | int write, sector_t sector) |
| 299 | { |
Herbert Xu | 4578932 | 2006-09-03 08:58:41 +1000 | [diff] [blame] | 300 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 301 | struct blkcipher_desc desc = { |
| 302 | .tfm = cc->tfm, |
| 303 | .info = iv, |
| 304 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, |
| 305 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | int r; |
| 307 | |
| 308 | if (cc->iv_gen_ops) { |
| 309 | r = cc->iv_gen_ops->generator(cc, iv, sector); |
| 310 | if (r < 0) |
| 311 | return r; |
| 312 | |
| 313 | if (write) |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 314 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | else |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 316 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } else { |
| 318 | if (write) |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 319 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | else |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 321 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | return r; |
| 325 | } |
| 326 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 327 | static void crypt_convert_init(struct crypt_config *cc, |
| 328 | struct convert_context *ctx, |
| 329 | struct bio *bio_out, struct bio *bio_in, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 330 | sector_t sector) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | ctx->bio_in = bio_in; |
| 333 | ctx->bio_out = bio_out; |
| 334 | ctx->offset_in = 0; |
| 335 | ctx->offset_out = 0; |
| 336 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; |
| 337 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; |
| 338 | ctx->sector = sector + cc->iv_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Encrypt / decrypt data from one bio to another one (can be the same one) |
| 343 | */ |
| 344 | static int crypt_convert(struct crypt_config *cc, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 345 | struct convert_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
| 347 | int r = 0; |
| 348 | |
| 349 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
| 350 | ctx->idx_out < ctx->bio_out->bi_vcnt) { |
| 351 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); |
| 352 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 353 | struct scatterlist sg_in, sg_out; |
| 354 | |
| 355 | sg_init_table(&sg_in, 1); |
Jens Axboe | 642f149 | 2007-10-24 11:20:47 +0200 | [diff] [blame] | 356 | sg_set_page(&sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, bv_in->bv_offset + ctx->offset_in); |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 357 | |
| 358 | sg_init_table(&sg_out, 1); |
Jens Axboe | 642f149 | 2007-10-24 11:20:47 +0200 | [diff] [blame] | 359 | sg_set_page(&sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, bv_out->bv_offset + ctx->offset_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | ctx->offset_in += sg_in.length; |
| 362 | if (ctx->offset_in >= bv_in->bv_len) { |
| 363 | ctx->offset_in = 0; |
| 364 | ctx->idx_in++; |
| 365 | } |
| 366 | |
| 367 | ctx->offset_out += sg_out.length; |
| 368 | if (ctx->offset_out >= bv_out->bv_len) { |
| 369 | ctx->offset_out = 0; |
| 370 | ctx->idx_out++; |
| 371 | } |
| 372 | |
| 373 | r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 374 | bio_data_dir(ctx->bio_in) == WRITE, ctx->sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | if (r < 0) |
| 376 | break; |
| 377 | |
| 378 | ctx->sector++; |
| 379 | } |
| 380 | |
| 381 | return r; |
| 382 | } |
| 383 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 384 | static void dm_crypt_bio_destructor(struct bio *bio) |
| 385 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 386 | struct dm_crypt_io *io = bio->bi_private; |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 387 | struct crypt_config *cc = io->target->private; |
| 388 | |
| 389 | bio_free(bio, cc->bs); |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 390 | } |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | /* |
| 393 | * Generate a new unfragmented bio with the given size |
| 394 | * This should never violate the device limitations |
| 395 | * May return a smaller bio when running out of pages |
| 396 | */ |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 397 | 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] | 398 | { |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 399 | struct crypt_config *cc = io->target->private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 400 | struct bio *clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Al Viro | b4e3ca1 | 2005-10-21 03:22:34 -0400 | [diff] [blame] | 402 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 403 | unsigned i, len; |
| 404 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 406 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 407 | if (!clone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 410 | clone_init(io, clone); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 411 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 412 | for (i = 0; i < nr_iovecs; i++) { |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 413 | page = mempool_alloc(cc->page_pool, gfp_mask); |
| 414 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | break; |
| 416 | |
| 417 | /* |
| 418 | * if additional pages cannot be allocated without waiting, |
| 419 | * return a partially allocated bio, the caller will then try |
| 420 | * to allocate additional bios while submitting this partial bio |
| 421 | */ |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 422 | if (i == (MIN_BIO_PAGES - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
| 424 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 425 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Milan Broz | 91e1062 | 2007-12-13 14:16:10 +0000 | [diff] [blame] | 427 | if (!bio_add_page(clone, page, len, 0)) { |
| 428 | mempool_free(page, cc->page_pool); |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | size -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 435 | if (!clone->bi_size) { |
| 436 | bio_put(clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | return NULL; |
| 438 | } |
| 439 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 440 | return clone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 443 | 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] | 444 | { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 445 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | struct bio_vec *bv; |
| 447 | |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 448 | for (i = 0; i < clone->bi_vcnt; i++) { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 449 | bv = bio_iovec_idx(clone, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | BUG_ON(!bv->bv_page); |
| 451 | mempool_free(bv->bv_page, cc->page_pool); |
| 452 | bv->bv_page = NULL; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * One of the bios was finished. Check for completion of |
| 458 | * the whole request and correctly clean up the buffer. |
| 459 | */ |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 460 | static void crypt_dec_pending(struct dm_crypt_io *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 462 | struct crypt_config *cc = io->target->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | if (!atomic_dec_and_test(&io->pending)) |
| 465 | return; |
| 466 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 467 | bio_endio(io->base_bio, io->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | mempool_free(io, cc->io_pool); |
| 469 | } |
| 470 | |
| 471 | /* |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 472 | * kcryptd/kcryptd_io: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | * |
| 474 | * Needed because it would be very unwise to do decryption in an |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 475 | * interrupt context. |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 476 | * |
| 477 | * kcryptd performs the actual encryption or decryption. |
| 478 | * |
| 479 | * kcryptd_io performs the IO submission. |
| 480 | * |
| 481 | * They must be separated as otherwise the final stages could be |
| 482 | * starved by new requests which can block in the first stages due |
| 483 | * to memory allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | */ |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 485 | static void crypt_endio(struct bio *clone, int error) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 486 | { |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 487 | struct dm_crypt_io *io = clone->bi_private; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 488 | struct crypt_config *cc = io->target->private; |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 489 | unsigned rw = bio_data_dir(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 490 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 491 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
| 492 | error = -EIO; |
| 493 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 494 | /* |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 495 | * free the processed pages |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 496 | */ |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 497 | if (rw == WRITE) |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 498 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | ee7a491 | 2008-02-08 02:10:46 +0000 | [diff] [blame] | 499 | |
| 500 | bio_put(clone); |
| 501 | |
| 502 | if (rw == READ && !error) { |
| 503 | kcryptd_queue_crypt(io); |
| 504 | return; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 505 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 506 | |
Milan Broz | adfe477 | 2007-12-13 14:15:51 +0000 | [diff] [blame] | 507 | if (unlikely(error)) |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 508 | io->error = error; |
| 509 | |
| 510 | crypt_dec_pending(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 511 | } |
| 512 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 513 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 514 | { |
| 515 | struct crypt_config *cc = io->target->private; |
| 516 | |
| 517 | clone->bi_private = io; |
| 518 | clone->bi_end_io = crypt_endio; |
| 519 | clone->bi_bdev = cc->dev->bdev; |
| 520 | clone->bi_rw = io->base_bio->bi_rw; |
Olaf Kirch | 027581f | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 521 | clone->bi_destructor = dm_crypt_bio_destructor; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 524 | static void kcryptd_io_read(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 525 | { |
| 526 | struct crypt_config *cc = io->target->private; |
| 527 | struct bio *base_bio = io->base_bio; |
| 528 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 529 | sector_t sector = base_bio->bi_sector - io->target->begin; |
| 530 | |
| 531 | atomic_inc(&io->pending); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 532 | |
| 533 | /* |
| 534 | * The block layer might modify the bvec array, so always |
| 535 | * copy the required bvecs because we need the original |
| 536 | * one in order to decrypt the whole bio data *afterwards*. |
| 537 | */ |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 538 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 539 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 540 | io->error = -ENOMEM; |
| 541 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 542 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 543 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 544 | |
| 545 | clone_init(io, clone); |
| 546 | clone->bi_idx = 0; |
| 547 | clone->bi_vcnt = bio_segments(base_bio); |
| 548 | clone->bi_size = base_bio->bi_size; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 549 | clone->bi_sector = cc->start + sector; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 550 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
| 551 | sizeof(struct bio_vec) * clone->bi_vcnt); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 552 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 553 | generic_make_request(clone); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 556 | static void kcryptd_io_write(struct dm_crypt_io *io) |
| 557 | { |
| 558 | } |
| 559 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame^] | 560 | static void kcryptd_io(struct work_struct *work) |
| 561 | { |
| 562 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 563 | |
| 564 | if (bio_data_dir(io->base_bio) == READ) |
| 565 | kcryptd_io_read(io); |
| 566 | else |
| 567 | kcryptd_io_write(io); |
| 568 | } |
| 569 | |
| 570 | static void kcryptd_queue_io(struct dm_crypt_io *io) |
| 571 | { |
| 572 | struct crypt_config *cc = io->target->private; |
| 573 | |
| 574 | INIT_WORK(&io->work, kcryptd_io); |
| 575 | queue_work(cc->io_queue, &io->work); |
| 576 | } |
| 577 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 578 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error) |
| 579 | { |
| 580 | } |
| 581 | |
| 582 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 583 | { |
| 584 | struct crypt_config *cc = io->target->private; |
| 585 | struct bio *base_bio = io->base_bio; |
| 586 | struct bio *clone; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 587 | unsigned remaining = base_bio->bi_size; |
| 588 | sector_t sector = base_bio->bi_sector - io->target->begin; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 589 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 590 | atomic_inc(&io->pending); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 591 | |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 592 | crypt_convert_init(cc, &io->ctx, NULL, base_bio, sector); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 593 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 594 | /* |
| 595 | * The allocated buffers can be smaller than the whole bio, |
| 596 | * so repeat the whole process until all the data can be handled. |
| 597 | */ |
| 598 | while (remaining) { |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 599 | clone = crypt_alloc_buffer(io, remaining); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 600 | if (unlikely(!clone)) { |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 601 | io->error = -ENOMEM; |
| 602 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 603 | return; |
| 604 | } |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 605 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 606 | io->ctx.bio_out = clone; |
| 607 | io->ctx.idx_out = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 608 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 609 | if (unlikely(crypt_convert(cc, &io->ctx) < 0)) { |
Neil Brown | 644bd2f | 2007-10-16 13:48:46 +0200 | [diff] [blame] | 610 | crypt_free_buffer_pages(cc, clone); |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 611 | bio_put(clone); |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 612 | io->error = -EIO; |
| 613 | crypt_dec_pending(io); |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 614 | return; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 615 | } |
| 616 | |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 617 | /* crypt_convert should have filled the clone bio */ |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 618 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); |
Olaf Kirch | f97380b | 2007-05-09 02:32:54 -0700 | [diff] [blame] | 619 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 620 | clone->bi_sector = cc->start + sector; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 621 | remaining -= clone->bi_size; |
| 622 | sector += bio_sectors(clone); |
| 623 | |
Olaf Kirch | 2f9941b | 2007-05-09 02:32:53 -0700 | [diff] [blame] | 624 | /* Grab another reference to the io struct |
| 625 | * before we kick off the request */ |
Milan Broz | 23541d2 | 2006-10-03 01:15:39 -0700 | [diff] [blame] | 626 | if (remaining) |
| 627 | atomic_inc(&io->pending); |
| 628 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 629 | generic_make_request(clone); |
| 630 | |
Olaf Kirch | 98221eb | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 631 | /* Do not reference clone after this - it |
| 632 | * may be gone already. */ |
| 633 | |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 634 | /* out of memory -> run queues */ |
| 635 | if (remaining) |
Olaf Kirch | 98221eb | 2007-05-09 02:32:52 -0700 | [diff] [blame] | 636 | congestion_wait(WRITE, HZ/100); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 637 | } |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 638 | } |
| 639 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 640 | 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] | 641 | { |
| 642 | if (unlikely(error < 0)) |
| 643 | io->error = -EIO; |
| 644 | |
| 645 | crypt_dec_pending(io); |
| 646 | } |
| 647 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 648 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 649 | { |
| 650 | struct crypt_config *cc = io->target->private; |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 651 | int r = 0; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 652 | |
Milan Broz | 5301703 | 2008-02-08 02:10:38 +0000 | [diff] [blame] | 653 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
Milan Broz | fcd369d | 2008-02-08 02:10:41 +0000 | [diff] [blame] | 654 | io->base_bio->bi_sector - io->target->begin); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 655 | |
Milan Broz | 5742fd7 | 2008-02-08 02:10:43 +0000 | [diff] [blame] | 656 | r = crypt_convert(cc, &io->ctx); |
| 657 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 658 | kcryptd_crypt_read_done(io, r); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Milan Broz | 4e4eef6 | 2008-02-08 02:10:49 +0000 | [diff] [blame] | 661 | static void kcryptd_crypt(struct work_struct *work) |
| 662 | { |
| 663 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
| 664 | |
| 665 | if (bio_data_dir(io->base_bio) == READ) |
| 666 | kcryptd_crypt_read_convert(io); |
| 667 | else |
| 668 | kcryptd_crypt_write_convert(io); |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Alasdair G Kergon | 395b167 | 2008-02-08 02:10:52 +0000 | [diff] [blame^] | 671 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
| 672 | { |
| 673 | struct crypt_config *cc = io->target->private; |
| 674 | |
| 675 | INIT_WORK(&io->work, kcryptd_crypt); |
| 676 | queue_work(cc->crypt_queue, &io->work); |
| 677 | } |
| 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /* |
| 680 | * Decode key from its hex representation |
| 681 | */ |
| 682 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) |
| 683 | { |
| 684 | char buffer[3]; |
| 685 | char *endp; |
| 686 | unsigned int i; |
| 687 | |
| 688 | buffer[2] = '\0'; |
| 689 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 690 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | buffer[0] = *hex++; |
| 692 | buffer[1] = *hex++; |
| 693 | |
| 694 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); |
| 695 | |
| 696 | if (endp != &buffer[2]) |
| 697 | return -EINVAL; |
| 698 | } |
| 699 | |
| 700 | if (*hex != '\0') |
| 701 | return -EINVAL; |
| 702 | |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * Encode key into its hex representation |
| 708 | */ |
| 709 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) |
| 710 | { |
| 711 | unsigned int i; |
| 712 | |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 713 | for (i = 0; i < size; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | sprintf(hex, "%02x", *key); |
| 715 | hex += 2; |
| 716 | key++; |
| 717 | } |
| 718 | } |
| 719 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 720 | static int crypt_set_key(struct crypt_config *cc, char *key) |
| 721 | { |
| 722 | unsigned key_size = strlen(key) >> 1; |
| 723 | |
| 724 | if (cc->key_size && cc->key_size != key_size) |
| 725 | return -EINVAL; |
| 726 | |
| 727 | cc->key_size = key_size; /* initial settings */ |
| 728 | |
| 729 | if ((!key_size && strcmp(key, "-")) || |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 730 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 731 | return -EINVAL; |
| 732 | |
| 733 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 734 | |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static int crypt_wipe_key(struct crypt_config *cc) |
| 739 | { |
| 740 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
| 741 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
| 742 | return 0; |
| 743 | } |
| 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | /* |
| 746 | * Construct an encryption mapping: |
| 747 | * <cipher> <key> <iv_offset> <dev_path> <start> |
| 748 | */ |
| 749 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 750 | { |
| 751 | struct crypt_config *cc; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 752 | struct crypto_blkcipher *tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | char *tmp; |
| 754 | char *cipher; |
| 755 | char *chainmode; |
| 756 | char *ivmode; |
| 757 | char *ivopts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | unsigned int key_size; |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 759 | unsigned long long tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | if (argc != 5) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 762 | ti->error = "Not enough arguments"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | return -EINVAL; |
| 764 | } |
| 765 | |
| 766 | tmp = argv[0]; |
| 767 | cipher = strsep(&tmp, "-"); |
| 768 | chainmode = strsep(&tmp, "-"); |
| 769 | ivopts = strsep(&tmp, "-"); |
| 770 | ivmode = strsep(&ivopts, ":"); |
| 771 | |
| 772 | if (tmp) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 773 | DMWARN("Unexpected additional cipher options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | key_size = strlen(argv[1]) >> 1; |
| 776 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 777 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | if (cc == NULL) { |
| 779 | ti->error = |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 780 | "Cannot allocate transparent encryption context"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | return -ENOMEM; |
| 782 | } |
| 783 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 784 | if (crypt_set_key(cc, argv[1])) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 785 | ti->error = "Error decoding key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 786 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
| 788 | |
| 789 | /* Compatiblity mode for old dm-crypt cipher strings */ |
| 790 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { |
| 791 | chainmode = "cbc"; |
| 792 | ivmode = "plain"; |
| 793 | } |
| 794 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 795 | if (strcmp(chainmode, "ecb") && !ivmode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 796 | ti->error = "This chaining mode requires an IV mechanism"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 797 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 800 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
| 801 | chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) { |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 802 | ti->error = "Chain mode + cipher name is too long"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 803 | goto bad_cipher; |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
| 807 | if (IS_ERR(tfm)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 808 | ti->error = "Error allocating crypto tfm"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 809 | goto bad_cipher; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 812 | strcpy(cc->cipher, cipher); |
| 813 | strcpy(cc->chainmode, chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | cc->tfm = tfm; |
| 815 | |
| 816 | /* |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 817 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | * See comments at iv code |
| 819 | */ |
| 820 | |
| 821 | if (ivmode == NULL) |
| 822 | cc->iv_gen_ops = NULL; |
| 823 | else if (strcmp(ivmode, "plain") == 0) |
| 824 | cc->iv_gen_ops = &crypt_iv_plain_ops; |
| 825 | else if (strcmp(ivmode, "essiv") == 0) |
| 826 | cc->iv_gen_ops = &crypt_iv_essiv_ops; |
Rik Snel | 48527fa | 2006-09-03 08:56:39 +1000 | [diff] [blame] | 827 | else if (strcmp(ivmode, "benbi") == 0) |
| 828 | cc->iv_gen_ops = &crypt_iv_benbi_ops; |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 829 | else if (strcmp(ivmode, "null") == 0) |
| 830 | cc->iv_gen_ops = &crypt_iv_null_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | else { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 832 | ti->error = "Invalid IV mode"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 833 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | |
| 836 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && |
| 837 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 838 | goto bad_ivmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 840 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
| 841 | if (cc->iv_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | /* at least a 64 bit sector number should fit in our buffer */ |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 843 | cc->iv_size = max(cc->iv_size, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 844 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | if (cc->iv_gen_ops) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 847 | DMWARN("Selected cipher does not support IVs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | if (cc->iv_gen_ops->dtr) |
| 849 | cc->iv_gen_ops->dtr(cc); |
| 850 | cc->iv_gen_ops = NULL; |
| 851 | } |
| 852 | } |
| 853 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 854 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | if (!cc->io_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 856 | ti->error = "Cannot allocate crypt io mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 857 | goto bad_slab_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Matthew Dobson | a19b27c | 2006-03-26 01:37:45 -0800 | [diff] [blame] | 860 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | if (!cc->page_pool) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 862 | ti->error = "Cannot allocate page mempool"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 863 | goto bad_page_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | |
Jens Axboe | 5972511 | 2007-04-02 10:06:42 +0200 | [diff] [blame] | 866 | cc->bs = bioset_create(MIN_IOS, MIN_IOS); |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 867 | if (!cc->bs) { |
| 868 | ti->error = "Cannot allocate crypt bioset"; |
| 869 | goto bad_bs; |
| 870 | } |
| 871 | |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 872 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 873 | ti->error = "Error setting key"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 874 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
| 876 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 877 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 878 | ti->error = "Invalid iv_offset sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 879 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 881 | cc->iv_offset = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 883 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 884 | ti->error = "Invalid device sector"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 885 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 887 | cc->start = tmpll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
| 889 | if (dm_get_device(ti, argv[3], cc->start, ti->len, |
Milan Broz | d469f84 | 2007-10-19 22:42:37 +0100 | [diff] [blame] | 890 | dm_table_get_mode(ti->table), &cc->dev)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 891 | ti->error = "Device lookup failed"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 892 | goto bad_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | if (ivmode && cc->iv_gen_ops) { |
| 896 | if (ivopts) |
| 897 | *(ivopts - 1) = ':'; |
| 898 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); |
| 899 | if (!cc->iv_mode) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 900 | ti->error = "Error kmallocing iv_mode string"; |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 901 | goto bad_ivmode_string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | } |
| 903 | strcpy(cc->iv_mode, ivmode); |
| 904 | } else |
| 905 | cc->iv_mode = NULL; |
| 906 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 907 | cc->io_queue = create_singlethread_workqueue("kcryptd_io"); |
| 908 | if (!cc->io_queue) { |
| 909 | ti->error = "Couldn't create kcryptd io queue"; |
| 910 | goto bad_io_queue; |
| 911 | } |
| 912 | |
| 913 | cc->crypt_queue = create_singlethread_workqueue("kcryptd"); |
| 914 | if (!cc->crypt_queue) { |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 915 | ti->error = "Couldn't create kcryptd queue"; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 916 | goto bad_crypt_queue; |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 917 | } |
| 918 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | ti->private = cc; |
| 920 | return 0; |
| 921 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 922 | bad_crypt_queue: |
| 923 | destroy_workqueue(cc->io_queue); |
| 924 | bad_io_queue: |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 925 | kfree(cc->iv_mode); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 926 | bad_ivmode_string: |
Dmitry Monakhov | 55b42c5 | 2007-10-19 22:38:37 +0100 | [diff] [blame] | 927 | dm_put_device(ti, cc->dev); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 928 | bad_device: |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 929 | bioset_free(cc->bs); |
| 930 | bad_bs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | mempool_destroy(cc->page_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 932 | bad_page_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | mempool_destroy(cc->io_pool); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 934 | bad_slab_pool: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 936 | cc->iv_gen_ops->dtr(cc); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 937 | bad_ivmode: |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 938 | crypto_free_blkcipher(tfm); |
Milan Broz | 636d578 | 2007-10-19 22:47:52 +0100 | [diff] [blame] | 939 | bad_cipher: |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 940 | /* Must zero key material before freeing */ |
| 941 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | kfree(cc); |
| 943 | return -EINVAL; |
| 944 | } |
| 945 | |
| 946 | static void crypt_dtr(struct dm_target *ti) |
| 947 | { |
| 948 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
| 949 | |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 950 | destroy_workqueue(cc->io_queue); |
| 951 | destroy_workqueue(cc->crypt_queue); |
Milan Broz | 80b16c1 | 2007-07-21 04:37:27 -0700 | [diff] [blame] | 952 | |
Milan Broz | 6a24c71 | 2006-10-03 01:15:40 -0700 | [diff] [blame] | 953 | bioset_free(cc->bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | mempool_destroy(cc->page_pool); |
| 955 | mempool_destroy(cc->io_pool); |
| 956 | |
Jesper Juhl | 990a8ba | 2005-06-21 17:17:30 -0700 | [diff] [blame] | 957 | kfree(cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
| 959 | cc->iv_gen_ops->dtr(cc); |
Herbert Xu | d1806f6 | 2006-08-22 20:29:17 +1000 | [diff] [blame] | 960 | crypto_free_blkcipher(cc->tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | dm_put_device(ti, cc->dev); |
Stefan Rompf | 9d3520a | 2006-01-06 00:20:08 -0800 | [diff] [blame] | 962 | |
| 963 | /* Must zero key material before freeing */ |
| 964 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | kfree(cc); |
| 966 | } |
| 967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
| 969 | union map_info *map_context) |
| 970 | { |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 971 | struct crypt_config *cc = ti->private; |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 972 | struct dm_crypt_io *io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 974 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | io->target = ti; |
Milan Broz | 8b00445 | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 976 | io->base_bio = bio; |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 977 | io->error = 0; |
Milan Broz | 93e605c | 2006-10-03 01:15:38 -0700 | [diff] [blame] | 978 | atomic_set(&io->pending, 0); |
Milan Broz | cabf08e | 2007-10-19 22:38:58 +0100 | [diff] [blame] | 979 | |
| 980 | if (bio_data_dir(io->base_bio) == READ) |
| 981 | kcryptd_queue_io(io); |
| 982 | else |
| 983 | kcryptd_queue_crypt(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 985 | return DM_MAPIO_SUBMITTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | |
| 988 | static int crypt_status(struct dm_target *ti, status_type_t type, |
| 989 | char *result, unsigned int maxlen) |
| 990 | { |
| 991 | struct crypt_config *cc = (struct crypt_config *) ti->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | unsigned int sz = 0; |
| 993 | |
| 994 | switch (type) { |
| 995 | case STATUSTYPE_INFO: |
| 996 | result[0] = '\0'; |
| 997 | break; |
| 998 | |
| 999 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | if (cc->iv_mode) |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1001 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
| 1002 | cc->iv_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | else |
Christophe Saout | 37af656 | 2006-10-30 20:39:08 +0100 | [diff] [blame] | 1004 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
| 1006 | if (cc->key_size > 0) { |
| 1007 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) |
| 1008 | return -ENOMEM; |
| 1009 | |
| 1010 | crypt_encode_key(result + sz, cc->key, cc->key_size); |
| 1011 | sz += cc->key_size << 1; |
| 1012 | } else { |
| 1013 | if (sz >= maxlen) |
| 1014 | return -ENOMEM; |
| 1015 | result[sz++] = '-'; |
| 1016 | } |
| 1017 | |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 1018 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
| 1019 | cc->dev->name, (unsigned long long)cc->start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | break; |
| 1021 | } |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1025 | static void crypt_postsuspend(struct dm_target *ti) |
| 1026 | { |
| 1027 | struct crypt_config *cc = ti->private; |
| 1028 | |
| 1029 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1030 | } |
| 1031 | |
| 1032 | static int crypt_preresume(struct dm_target *ti) |
| 1033 | { |
| 1034 | struct crypt_config *cc = ti->private; |
| 1035 | |
| 1036 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { |
| 1037 | DMERR("aborting resume - crypt key is not set."); |
| 1038 | return -EAGAIN; |
| 1039 | } |
| 1040 | |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | static void crypt_resume(struct dm_target *ti) |
| 1045 | { |
| 1046 | struct crypt_config *cc = ti->private; |
| 1047 | |
| 1048 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); |
| 1049 | } |
| 1050 | |
| 1051 | /* Message interface |
| 1052 | * key set <key> |
| 1053 | * key wipe |
| 1054 | */ |
| 1055 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) |
| 1056 | { |
| 1057 | struct crypt_config *cc = ti->private; |
| 1058 | |
| 1059 | if (argc < 2) |
| 1060 | goto error; |
| 1061 | |
| 1062 | if (!strnicmp(argv[0], MESG_STR("key"))) { |
| 1063 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
| 1064 | DMWARN("not suspended during key manipulation."); |
| 1065 | return -EINVAL; |
| 1066 | } |
| 1067 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) |
| 1068 | return crypt_set_key(cc, argv[2]); |
| 1069 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) |
| 1070 | return crypt_wipe_key(cc); |
| 1071 | } |
| 1072 | |
| 1073 | error: |
| 1074 | DMWARN("unrecognised message received."); |
| 1075 | return -EINVAL; |
| 1076 | } |
| 1077 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | static struct target_type crypt_target = { |
| 1079 | .name = "crypt", |
Ludwig Nussel | 46b4773 | 2007-05-09 02:32:55 -0700 | [diff] [blame] | 1080 | .version= {1, 5, 0}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | .module = THIS_MODULE, |
| 1082 | .ctr = crypt_ctr, |
| 1083 | .dtr = crypt_dtr, |
| 1084 | .map = crypt_map, |
| 1085 | .status = crypt_status, |
Milan Broz | e48d4bb | 2006-10-03 01:15:37 -0700 | [diff] [blame] | 1086 | .postsuspend = crypt_postsuspend, |
| 1087 | .preresume = crypt_preresume, |
| 1088 | .resume = crypt_resume, |
| 1089 | .message = crypt_message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | }; |
| 1091 | |
| 1092 | static int __init dm_crypt_init(void) |
| 1093 | { |
| 1094 | int r; |
| 1095 | |
Alasdair G Kergon | 028867a | 2007-07-12 17:26:32 +0100 | [diff] [blame] | 1096 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | if (!_crypt_io_pool) |
| 1098 | return -ENOMEM; |
| 1099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | r = dm_register_target(&crypt_target); |
| 1101 | if (r < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1102 | DMERR("register failed %d", r); |
Milan Broz | 9934a8b | 2007-10-19 22:38:57 +0100 | [diff] [blame] | 1103 | kmem_cache_destroy(_crypt_io_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | } |
| 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | return r; |
| 1107 | } |
| 1108 | |
| 1109 | static void __exit dm_crypt_exit(void) |
| 1110 | { |
| 1111 | int r = dm_unregister_target(&crypt_target); |
| 1112 | |
| 1113 | if (r < 0) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 1114 | DMERR("unregister failed %d", r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | kmem_cache_destroy(_crypt_io_pool); |
| 1117 | } |
| 1118 | |
| 1119 | module_init(dm_crypt_init); |
| 1120 | module_exit(dm_crypt_exit); |
| 1121 | |
| 1122 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); |
| 1123 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
| 1124 | MODULE_LICENSE("GPL"); |