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drivers/md/dm-crypt.c
44.1 KB
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/* * Copyright (C) 2003 Christophe Saout <christophe@saout.de> * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
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* Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved. |
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* * This file is released under the GPL. */ |
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#include <linux/completion.h> |
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#include <linux/err.h> |
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#include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/mempool.h> #include <linux/slab.h> #include <linux/crypto.h> #include <linux/workqueue.h> |
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#include <linux/backing-dev.h> |
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#include <linux/percpu.h> |
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#include <linux/atomic.h> |
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#include <linux/scatterlist.h> |
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#include <asm/page.h> |
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#include <asm/unaligned.h> |
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#include <crypto/hash.h> #include <crypto/md5.h> #include <crypto/algapi.h> |
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|
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#include <linux/device-mapper.h> |
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|
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#define DM_MSG_PREFIX "crypt" |
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/* |
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* context holding the current state of a multi-part conversion */ struct convert_context { |
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struct completion restart; |
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struct bio *bio_in; struct bio *bio_out; unsigned int offset_in; unsigned int offset_out; unsigned int idx_in; unsigned int idx_out; sector_t sector; |
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atomic_t pending; |
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}; |
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/* * per bio private data */ struct dm_crypt_io { struct dm_target *target; struct bio *base_bio; struct work_struct work; struct convert_context ctx; atomic_t pending; int error; |
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sector_t sector; |
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struct dm_crypt_io *base_io; |
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}; |
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struct dm_crypt_request { |
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struct convert_context *ctx; |
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struct scatterlist sg_in; struct scatterlist sg_out; |
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sector_t iv_sector; |
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}; |
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struct crypt_config; struct crypt_iv_operations { int (*ctr)(struct crypt_config *cc, struct dm_target *ti, |
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const char *opts); |
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void (*dtr)(struct crypt_config *cc); |
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int (*init)(struct crypt_config *cc); |
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int (*wipe)(struct crypt_config *cc); |
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int (*generator)(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq); int (*post)(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq); |
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}; |
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struct iv_essiv_private { |
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struct crypto_hash *hash_tfm; u8 *salt; |
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}; struct iv_benbi_private { int shift; }; |
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#define LMK_SEED_SIZE 64 /* hash + 0 */ struct iv_lmk_private { struct crypto_shash *hash_tfm; u8 *seed; }; |
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/* * Crypt: maps a linear range of a block device * and encrypts / decrypts at the same time. */ |
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enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
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/* * Duplicated per-CPU state for cipher. */ struct crypt_cpu { struct ablkcipher_request *req; |
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/* ESSIV: struct crypto_cipher *essiv_tfm */ void *iv_private; |
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struct crypto_ablkcipher *tfms[0]; |
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}; /* * The fields in here must be read only after initialization, * changing state should be in crypt_cpu. */ |
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struct crypt_config { struct dm_dev *dev; sector_t start; /* |
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* pool for per bio private data, crypto requests and * encryption requeusts/buffer pages |
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*/ mempool_t *io_pool; |
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mempool_t *req_pool; |
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mempool_t *page_pool; |
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struct bio_set *bs; |
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|
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struct workqueue_struct *io_queue; struct workqueue_struct *crypt_queue; |
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|
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char *cipher; |
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char *cipher_string; |
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|
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struct crypt_iv_operations *iv_gen_ops; |
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union { |
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struct iv_essiv_private essiv; struct iv_benbi_private benbi; |
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struct iv_lmk_private lmk; |
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} iv_gen_private; |
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sector_t iv_offset; unsigned int iv_size; |
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/* |
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* Duplicated per cpu state. Access through * per_cpu_ptr() only. */ struct crypt_cpu __percpu *cpu; |
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unsigned tfms_count; |
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/* |
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* Layout of each crypto request: * * struct ablkcipher_request * context * padding * struct dm_crypt_request * padding * IV * * The padding is added so that dm_crypt_request and the IV are * correctly aligned. */ unsigned int dmreq_start; |
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|
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unsigned long flags; |
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unsigned int key_size; |
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unsigned int key_parts; |
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u8 key[0]; }; |
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#define MIN_IOS 16 |
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#define MIN_POOL_PAGES 32 #define MIN_BIO_PAGES 8 |
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static struct kmem_cache *_crypt_io_pool; |
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|
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static void clone_init(struct dm_crypt_io *, struct bio *); |
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static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
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static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
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|
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static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) { return this_cpu_ptr(cc->cpu); } /* * Use this to access cipher attributes that are the same for each CPU. */ static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) { |
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return __this_cpu_ptr(cc->cpu)->tfms[0]; |
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} |
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/* |
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* Different IV generation algorithms: * |
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* plain: the initial vector is the 32-bit little-endian version of the sector |
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* number, padded with zeros if necessary. |
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* |
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* plain64: the initial vector is the 64-bit little-endian version of the sector * number, padded with zeros if necessary. * |
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* essiv: "encrypted sector|salt initial vector", the sector number is * encrypted with the bulk cipher using a salt as key. The salt * should be derived from the bulk cipher's key via hashing. |
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* |
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* benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 * (needed for LRW-32-AES and possible other narrow block modes) * |
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* null: the initial vector is always zero. Provides compatibility with * obsolete loop_fish2 devices. Do not use for new devices. * |
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* lmk: Compatible implementation of the block chaining mode used * by the Loop-AES block device encryption system * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ * It operates on full 512 byte sectors and uses CBC * with an IV derived from the sector number, the data and * optionally extra IV seed. * This means that after decryption the first block * of sector must be tweaked according to decrypted data. * Loop-AES can use three encryption schemes: * version 1: is plain aes-cbc mode * version 2: uses 64 multikey scheme with lmk IV generator * version 3: the same as version 2 with additional IV seed * (it uses 65 keys, last key is used as IV seed) * |
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* plumb: unimplemented, see: * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 */ |
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static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) |
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{ memset(iv, 0, cc->iv_size); |
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*(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
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return 0; } |
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static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
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struct dm_crypt_request *dmreq) |
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{ memset(iv, 0, cc->iv_size); |
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*(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
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return 0; } |
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/* Initialise ESSIV - compute salt but no local memory allocations */ static int crypt_iv_essiv_init(struct crypt_config *cc) { struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; struct hash_desc desc; struct scatterlist sg; |
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struct crypto_cipher *essiv_tfm; int err, cpu; |
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sg_init_one(&sg, cc->key, cc->key_size); desc.tfm = essiv->hash_tfm; desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); if (err) return err; |
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for_each_possible_cpu(cpu) { essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private, err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
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crypto_hash_digestsize(essiv->hash_tfm)); |
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if (err) return err; } return 0; |
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} |
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/* Wipe salt and reset key derived from volume key */ static int crypt_iv_essiv_wipe(struct crypt_config *cc) { struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); |
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struct crypto_cipher *essiv_tfm; int cpu, r, err = 0; |
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memset(essiv->salt, 0, salt_size); |
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for_each_possible_cpu(cpu) { essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private; r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); if (r) err = r; } return err; } /* Set up per cpu cipher state */ static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, struct dm_target *ti, u8 *salt, unsigned saltsize) { struct crypto_cipher *essiv_tfm; int err; /* Setup the essiv_tfm with the given salt */ essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(essiv_tfm)) { ti->error = "Error allocating crypto tfm for ESSIV"; return essiv_tfm; } if (crypto_cipher_blocksize(essiv_tfm) != crypto_ablkcipher_ivsize(any_tfm(cc))) { ti->error = "Block size of ESSIV cipher does " "not match IV size of block cipher"; crypto_free_cipher(essiv_tfm); return ERR_PTR(-EINVAL); } err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); if (err) { ti->error = "Failed to set key for ESSIV cipher"; crypto_free_cipher(essiv_tfm); return ERR_PTR(err); } return essiv_tfm; |
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} |
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static void crypt_iv_essiv_dtr(struct crypt_config *cc) { |
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int cpu; struct crypt_cpu *cpu_cc; struct crypto_cipher *essiv_tfm; |
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struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
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crypto_free_hash(essiv->hash_tfm); essiv->hash_tfm = NULL; kzfree(essiv->salt); essiv->salt = NULL; |
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for_each_possible_cpu(cpu) { cpu_cc = per_cpu_ptr(cc->cpu, cpu); essiv_tfm = cpu_cc->iv_private; if (essiv_tfm) crypto_free_cipher(essiv_tfm); cpu_cc->iv_private = NULL; } |
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} |
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static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
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const char *opts) |
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{ |
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struct crypto_cipher *essiv_tfm = NULL; struct crypto_hash *hash_tfm = NULL; |
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u8 *salt = NULL; |
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int err, cpu; |
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|
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if (!opts) { |
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ti->error = "Digest algorithm missing for ESSIV mode"; |
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return -EINVAL; } |
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/* Allocate hash algorithm */ |
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hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(hash_tfm)) { |
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ti->error = "Error initializing ESSIV hash"; |
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err = PTR_ERR(hash_tfm); goto bad; |
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} |
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salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
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if (!salt) { |
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ti->error = "Error kmallocing salt storage in ESSIV"; |
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err = -ENOMEM; goto bad; |
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} |
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cc->iv_gen_private.essiv.salt = salt; |
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cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
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for_each_possible_cpu(cpu) { essiv_tfm = setup_essiv_cpu(cc, ti, salt, crypto_hash_digestsize(hash_tfm)); if (IS_ERR(essiv_tfm)) { crypt_iv_essiv_dtr(cc); return PTR_ERR(essiv_tfm); } per_cpu_ptr(cc->cpu, cpu)->iv_private = essiv_tfm; } |
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return 0; |
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bad: |
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if (hash_tfm && !IS_ERR(hash_tfm)) crypto_free_hash(hash_tfm); |
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kfree(salt); |
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return err; |
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} |
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static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) |
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{ |
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struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private; |
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memset(iv, 0, cc->iv_size); |
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*(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
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crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
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return 0; } |
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static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { |
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unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
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int log = ilog2(bs); |
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/* we need to calculate how far we must shift the sector count * to get the cipher block count, we use this shift in _gen */ if (1 << log != bs) { ti->error = "cypher blocksize is not a power of 2"; return -EINVAL; } if (log > 9) { ti->error = "cypher blocksize is > 512"; return -EINVAL; } |
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cc->iv_gen_private.benbi.shift = 9 - log; |
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return 0; } static void crypt_iv_benbi_dtr(struct crypt_config *cc) { |
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} |
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static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) |
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{ |
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__be64 val; |
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memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
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|
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val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
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put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
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|
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return 0; } |
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static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) |
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{ memset(iv, 0, cc->iv_size); return 0; } |
347457859 dm crypt: add loo... |
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 |
static void crypt_iv_lmk_dtr(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) crypto_free_shash(lmk->hash_tfm); lmk->hash_tfm = NULL; kzfree(lmk->seed); lmk->seed = NULL; } static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); if (IS_ERR(lmk->hash_tfm)) { ti->error = "Error initializing LMK hash"; return PTR_ERR(lmk->hash_tfm); } /* No seed in LMK version 2 */ if (cc->key_parts == cc->tfms_count) { lmk->seed = NULL; return 0; } lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); if (!lmk->seed) { crypt_iv_lmk_dtr(cc); ti->error = "Error kmallocing seed storage in LMK"; return -ENOMEM; } return 0; } static int crypt_iv_lmk_init(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; int subkey_size = cc->key_size / cc->key_parts; /* LMK seed is on the position of LMK_KEYS + 1 key */ if (lmk->seed) memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), crypto_shash_digestsize(lmk->hash_tfm)); return 0; } static int crypt_iv_lmk_wipe(struct crypt_config *cc) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; if (lmk->seed) memset(lmk->seed, 0, LMK_SEED_SIZE); return 0; } static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq, u8 *data) { struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; struct { struct shash_desc desc; char ctx[crypto_shash_descsize(lmk->hash_tfm)]; } sdesc; struct md5_state md5state; u32 buf[4]; int i, r; sdesc.desc.tfm = lmk->hash_tfm; sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; r = crypto_shash_init(&sdesc.desc); if (r) return r; if (lmk->seed) { r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); if (r) return r; } /* Sector is always 512B, block size 16, add data of blocks 1-31 */ r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); if (r) return r; /* Sector is cropped to 56 bits here */ buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); buf[2] = cpu_to_le32(4024); buf[3] = 0; r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); if (r) return r; /* No MD5 padding here */ r = crypto_shash_export(&sdesc.desc, &md5state); if (r) return r; for (i = 0; i < MD5_HASH_WORDS; i++) __cpu_to_le32s(&md5state.hash[i]); memcpy(iv, &md5state.hash, cc->iv_size); return 0; } static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { u8 *src; int r = 0; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { src = kmap_atomic(sg_page(&dmreq->sg_in), KM_USER0); r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); kunmap_atomic(src, KM_USER0); } else memset(iv, 0, cc->iv_size); return r; } static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { u8 *dst; int r; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) return 0; dst = kmap_atomic(sg_page(&dmreq->sg_out), KM_USER0); r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); /* Tweak the first block of plaintext sector */ if (!r) crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); kunmap_atomic(dst, KM_USER0); return r; } |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 |
static struct crypt_iv_operations crypt_iv_plain_ops = { .generator = crypt_iv_plain_gen }; |
61afef614 dm crypt: add pla... |
590 591 592 |
static struct crypt_iv_operations crypt_iv_plain64_ops = { .generator = crypt_iv_plain64_gen }; |
1da177e4c Linux-2.6.12-rc2 |
593 594 595 |
static struct crypt_iv_operations crypt_iv_essiv_ops = { .ctr = crypt_iv_essiv_ctr, .dtr = crypt_iv_essiv_dtr, |
b95bf2d3d dm crypt: separat... |
596 |
.init = crypt_iv_essiv_init, |
542da3176 dm crypt: make wi... |
597 |
.wipe = crypt_iv_essiv_wipe, |
1da177e4c Linux-2.6.12-rc2 |
598 599 |
.generator = crypt_iv_essiv_gen }; |
48527fa7c [BLOCK] dm-crypt:... |
600 601 602 603 604 |
static struct crypt_iv_operations crypt_iv_benbi_ops = { .ctr = crypt_iv_benbi_ctr, .dtr = crypt_iv_benbi_dtr, .generator = crypt_iv_benbi_gen }; |
1da177e4c Linux-2.6.12-rc2 |
605 |
|
46b477306 dm crypt: add nul... |
606 607 608 |
static struct crypt_iv_operations crypt_iv_null_ops = { .generator = crypt_iv_null_gen }; |
347457859 dm crypt: add loo... |
609 610 611 612 613 614 615 616 |
static struct crypt_iv_operations crypt_iv_lmk_ops = { .ctr = crypt_iv_lmk_ctr, .dtr = crypt_iv_lmk_dtr, .init = crypt_iv_lmk_init, .wipe = crypt_iv_lmk_wipe, .generator = crypt_iv_lmk_gen, .post = crypt_iv_lmk_post }; |
d469f8419 dm crypt: tidy wh... |
617 618 619 |
static void crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, struct bio *bio_out, struct bio *bio_in, |
fcd369daa dm crypt: remove ... |
620 |
sector_t sector) |
1da177e4c Linux-2.6.12-rc2 |
621 622 623 624 625 626 627 628 |
{ ctx->bio_in = bio_in; ctx->bio_out = bio_out; ctx->offset_in = 0; ctx->offset_out = 0; ctx->idx_in = bio_in ? bio_in->bi_idx : 0; ctx->idx_out = bio_out ? bio_out->bi_idx : 0; ctx->sector = sector + cc->iv_offset; |
43d690348 dm crypt: add com... |
629 |
init_completion(&ctx->restart); |
1da177e4c Linux-2.6.12-rc2 |
630 |
} |
b2174eebd dm crypt: fix kcr... |
631 632 633 634 635 636 637 638 639 640 641 |
static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, struct ablkcipher_request *req) { return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); } static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); } |
2dc5327d3 dm crypt: add pos... |
642 643 644 645 646 647 |
static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { return (u8 *)ALIGN((unsigned long)(dmreq + 1), crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); } |
01482b767 dm crypt: extract... |
648 |
static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c990 dm crypt: use asy... |
649 650 |
struct convert_context *ctx, struct ablkcipher_request *req) |
01482b767 dm crypt: extract... |
651 652 653 |
{ struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); |
3a7f6c990 dm crypt: use asy... |
654 655 656 |
struct dm_crypt_request *dmreq; u8 *iv; int r = 0; |
b2174eebd dm crypt: fix kcr... |
657 |
dmreq = dmreq_of_req(cc, req); |
2dc5327d3 dm crypt: add pos... |
658 |
iv = iv_of_dmreq(cc, dmreq); |
01482b767 dm crypt: extract... |
659 |
|
2dc5327d3 dm crypt: add pos... |
660 |
dmreq->iv_sector = ctx->sector; |
b2174eebd dm crypt: fix kcr... |
661 |
dmreq->ctx = ctx; |
3a7f6c990 dm crypt: use asy... |
662 663 |
sg_init_table(&dmreq->sg_in, 1); sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, |
01482b767 dm crypt: extract... |
664 |
bv_in->bv_offset + ctx->offset_in); |
3a7f6c990 dm crypt: use asy... |
665 666 |
sg_init_table(&dmreq->sg_out, 1); sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, |
01482b767 dm crypt: extract... |
667 668 669 670 671 672 673 674 675 676 677 678 679 |
bv_out->bv_offset + ctx->offset_out); ctx->offset_in += 1 << SECTOR_SHIFT; if (ctx->offset_in >= bv_in->bv_len) { ctx->offset_in = 0; ctx->idx_in++; } ctx->offset_out += 1 << SECTOR_SHIFT; if (ctx->offset_out >= bv_out->bv_len) { ctx->offset_out = 0; ctx->idx_out++; } |
3a7f6c990 dm crypt: use asy... |
680 |
if (cc->iv_gen_ops) { |
2dc5327d3 dm crypt: add pos... |
681 |
r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c990 dm crypt: use asy... |
682 683 684 685 686 687 688 689 690 691 692 |
if (r < 0) return r; } ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, 1 << SECTOR_SHIFT, iv); if (bio_data_dir(ctx->bio_in) == WRITE) r = crypto_ablkcipher_encrypt(req); else r = crypto_ablkcipher_decrypt(req); |
2dc5327d3 dm crypt: add pos... |
693 694 |
if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) r = cc->iv_gen_ops->post(cc, iv, dmreq); |
3a7f6c990 dm crypt: use asy... |
695 |
return r; |
01482b767 dm crypt: extract... |
696 |
} |
95497a960 dm crypt: prepare... |
697 698 |
static void kcryptd_async_done(struct crypto_async_request *async_req, int error); |
c02977212 dm crypt: scale t... |
699 |
|
ddd42edfd dm crypt: add asy... |
700 701 702 |
static void crypt_alloc_req(struct crypt_config *cc, struct convert_context *ctx) { |
c02977212 dm crypt: scale t... |
703 |
struct crypt_cpu *this_cc = this_crypt_config(cc); |
d1f964238 dm crypt: add mul... |
704 |
unsigned key_index = ctx->sector & (cc->tfms_count - 1); |
c02977212 dm crypt: scale t... |
705 706 707 |
if (!this_cc->req) this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); |
d1f964238 dm crypt: add mul... |
708 |
ablkcipher_request_set_tfm(this_cc->req, this_cc->tfms[key_index]); |
c02977212 dm crypt: scale t... |
709 710 711 |
ablkcipher_request_set_callback(this_cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); |
ddd42edfd dm crypt: add asy... |
712 |
} |
1da177e4c Linux-2.6.12-rc2 |
713 714 715 716 |
/* * Encrypt / decrypt data from one bio to another one (can be the same one) */ static int crypt_convert(struct crypt_config *cc, |
d469f8419 dm crypt: tidy wh... |
717 |
struct convert_context *ctx) |
1da177e4c Linux-2.6.12-rc2 |
718 |
{ |
c02977212 dm crypt: scale t... |
719 |
struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070f dm crypt: fix ctx... |
720 |
int r; |
1da177e4c Linux-2.6.12-rc2 |
721 |
|
c8081618a dm crypt: tidy ct... |
722 |
atomic_set(&ctx->pending, 1); |
1da177e4c Linux-2.6.12-rc2 |
723 724 |
while(ctx->idx_in < ctx->bio_in->bi_vcnt && ctx->idx_out < ctx->bio_out->bi_vcnt) { |
1da177e4c Linux-2.6.12-rc2 |
725 |
|
3a7f6c990 dm crypt: use asy... |
726 |
crypt_alloc_req(cc, ctx); |
3f1e9070f dm crypt: fix ctx... |
727 |
atomic_inc(&ctx->pending); |
c02977212 dm crypt: scale t... |
728 |
r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c990 dm crypt: use asy... |
729 730 |
switch (r) { |
3f1e9070f dm crypt: fix ctx... |
731 |
/* async */ |
3a7f6c990 dm crypt: use asy... |
732 733 734 735 736 |
case -EBUSY: wait_for_completion(&ctx->restart); INIT_COMPLETION(ctx->restart); /* fall through*/ case -EINPROGRESS: |
c02977212 dm crypt: scale t... |
737 |
this_cc->req = NULL; |
3f1e9070f dm crypt: fix ctx... |
738 739 740 741 |
ctx->sector++; continue; /* sync */ |
3a7f6c990 dm crypt: use asy... |
742 |
case 0: |
3f1e9070f dm crypt: fix ctx... |
743 |
atomic_dec(&ctx->pending); |
3a7f6c990 dm crypt: use asy... |
744 |
ctx->sector++; |
c7f1b2044 dm crypt: use con... |
745 |
cond_resched(); |
3a7f6c990 dm crypt: use asy... |
746 |
continue; |
3a7f6c990 dm crypt: use asy... |
747 |
|
3f1e9070f dm crypt: fix ctx... |
748 749 750 751 752 |
/* error */ default: atomic_dec(&ctx->pending); return r; } |
1da177e4c Linux-2.6.12-rc2 |
753 |
} |
3f1e9070f dm crypt: fix ctx... |
754 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
755 |
} |
d469f8419 dm crypt: tidy wh... |
756 757 |
static void dm_crypt_bio_destructor(struct bio *bio) { |
028867ac2 dm: use kmem_cach... |
758 |
struct dm_crypt_io *io = bio->bi_private; |
6a24c7184 [PATCH] dm crypt:... |
759 760 761 |
struct crypt_config *cc = io->target->private; bio_free(bio, cc->bs); |
d469f8419 dm crypt: tidy wh... |
762 |
} |
6a24c7184 [PATCH] dm crypt:... |
763 |
|
1da177e4c Linux-2.6.12-rc2 |
764 765 766 |
/* * Generate a new unfragmented bio with the given size * This should never violate the device limitations |
933f01d43 dm crypt: avoid u... |
767 768 |
* May return a smaller bio when running out of pages, indicated by * *out_of_pages set to 1. |
1da177e4c Linux-2.6.12-rc2 |
769 |
*/ |
933f01d43 dm crypt: avoid u... |
770 771 |
static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, unsigned *out_of_pages) |
1da177e4c Linux-2.6.12-rc2 |
772 |
{ |
027581f35 dm crypt: fix cal... |
773 |
struct crypt_config *cc = io->target->private; |
8b0044571 [PATCH] dm crypt:... |
774 |
struct bio *clone; |
1da177e4c Linux-2.6.12-rc2 |
775 |
unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1ab [PATCH] gfp_t: re... |
776 |
gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e106259 dm crypt: use bio... |
777 778 |
unsigned i, len; struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
779 |
|
2f9941b6c dm crypt: fix rem... |
780 |
clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b0044571 [PATCH] dm crypt:... |
781 |
if (!clone) |
1da177e4c Linux-2.6.12-rc2 |
782 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
783 |
|
027581f35 dm crypt: fix cal... |
784 |
clone_init(io, clone); |
933f01d43 dm crypt: avoid u... |
785 |
*out_of_pages = 0; |
6a24c7184 [PATCH] dm crypt:... |
786 |
|
f97380bca dm crypt: use sma... |
787 |
for (i = 0; i < nr_iovecs; i++) { |
91e106259 dm crypt: use bio... |
788 |
page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d43 dm crypt: avoid u... |
789 790 |
if (!page) { *out_of_pages = 1; |
1da177e4c Linux-2.6.12-rc2 |
791 |
break; |
933f01d43 dm crypt: avoid u... |
792 |
} |
1da177e4c Linux-2.6.12-rc2 |
793 794 795 796 797 798 |
/* * if additional pages cannot be allocated without waiting, * return a partially allocated bio, the caller will then try * to allocate additional bios while submitting this partial bio */ |
f97380bca dm crypt: use sma... |
799 |
if (i == (MIN_BIO_PAGES - 1)) |
1da177e4c Linux-2.6.12-rc2 |
800 |
gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
91e106259 dm crypt: use bio... |
801 802 803 804 805 806 |
len = (size > PAGE_SIZE) ? PAGE_SIZE : size; if (!bio_add_page(clone, page, len, 0)) { mempool_free(page, cc->page_pool); break; } |
1da177e4c Linux-2.6.12-rc2 |
807 |
|
91e106259 dm crypt: use bio... |
808 |
size -= len; |
1da177e4c Linux-2.6.12-rc2 |
809 |
} |
8b0044571 [PATCH] dm crypt:... |
810 811 |
if (!clone->bi_size) { bio_put(clone); |
1da177e4c Linux-2.6.12-rc2 |
812 813 |
return NULL; } |
8b0044571 [PATCH] dm crypt:... |
814 |
return clone; |
1da177e4c Linux-2.6.12-rc2 |
815 |
} |
644bd2f04 Fix memory leak i... |
816 |
static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4c Linux-2.6.12-rc2 |
817 |
{ |
644bd2f04 Fix memory leak i... |
818 |
unsigned int i; |
1da177e4c Linux-2.6.12-rc2 |
819 |
struct bio_vec *bv; |
644bd2f04 Fix memory leak i... |
820 |
for (i = 0; i < clone->bi_vcnt; i++) { |
8b0044571 [PATCH] dm crypt:... |
821 |
bv = bio_iovec_idx(clone, i); |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 |
BUG_ON(!bv->bv_page); mempool_free(bv->bv_page, cc->page_pool); bv->bv_page = NULL; } } |
dc440d1e5 dm crypt: tidy cr... |
827 828 829 830 831 832 833 834 835 836 837 |
static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, struct bio *bio, sector_t sector) { struct crypt_config *cc = ti->private; struct dm_crypt_io *io; io = mempool_alloc(cc->io_pool, GFP_NOIO); io->target = ti; io->base_bio = bio; io->sector = sector; io->error = 0; |
393b47ef2 dm crypt: fix asy... |
838 |
io->base_io = NULL; |
dc440d1e5 dm crypt: tidy cr... |
839 840 841 842 |
atomic_set(&io->pending, 0); return io; } |
3e1a8bdd0 dm crypt: tidy in... |
843 844 845 846 |
static void crypt_inc_pending(struct dm_crypt_io *io) { atomic_inc(&io->pending); } |
1da177e4c Linux-2.6.12-rc2 |
847 848 849 |
/* * One of the bios was finished. Check for completion of * the whole request and correctly clean up the buffer. |
393b47ef2 dm crypt: fix asy... |
850 |
* If base_io is set, wait for the last fragment to complete. |
1da177e4c Linux-2.6.12-rc2 |
851 |
*/ |
5742fd777 dm crypt: move er... |
852 |
static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4c Linux-2.6.12-rc2 |
853 |
{ |
5742fd777 dm crypt: move er... |
854 |
struct crypt_config *cc = io->target->private; |
b35f8caa0 dm crypt: wait fo... |
855 856 857 |
struct bio *base_bio = io->base_bio; struct dm_crypt_io *base_io = io->base_io; int error = io->error; |
1da177e4c Linux-2.6.12-rc2 |
858 859 860 |
if (!atomic_dec_and_test(&io->pending)) return; |
b35f8caa0 dm crypt: wait fo... |
861 862 863 864 |
mempool_free(io, cc->io_pool); if (likely(!base_io)) bio_endio(base_bio, error); |
393b47ef2 dm crypt: fix asy... |
865 |
else { |
b35f8caa0 dm crypt: wait fo... |
866 867 868 |
if (error && !base_io->error) base_io->error = error; crypt_dec_pending(base_io); |
393b47ef2 dm crypt: fix asy... |
869 |
} |
1da177e4c Linux-2.6.12-rc2 |
870 871 872 |
} /* |
cabf08e4d dm crypt: add pos... |
873 |
* kcryptd/kcryptd_io: |
1da177e4c Linux-2.6.12-rc2 |
874 875 |
* * Needed because it would be very unwise to do decryption in an |
23541d2d2 [PATCH] dm crypt:... |
876 |
* interrupt context. |
cabf08e4d dm crypt: add pos... |
877 878 879 880 881 882 883 884 |
* * kcryptd performs the actual encryption or decryption. * * kcryptd_io performs the IO submission. * * They must be separated as otherwise the final stages could be * starved by new requests which can block in the first stages due * to memory allocation. |
c02977212 dm crypt: scale t... |
885 886 887 |
* * The work is done per CPU global for all dm-crypt instances. * They should not depend on each other and do not block. |
1da177e4c Linux-2.6.12-rc2 |
888 |
*/ |
6712ecf8f Drop 'size' argum... |
889 |
static void crypt_endio(struct bio *clone, int error) |
8b0044571 [PATCH] dm crypt:... |
890 |
{ |
028867ac2 dm: use kmem_cach... |
891 |
struct dm_crypt_io *io = clone->bi_private; |
8b0044571 [PATCH] dm crypt:... |
892 |
struct crypt_config *cc = io->target->private; |
ee7a491e6 dm crypt: tidy cr... |
893 |
unsigned rw = bio_data_dir(clone); |
8b0044571 [PATCH] dm crypt:... |
894 |
|
adfe47702 dm crypt: fix wri... |
895 896 |
if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) error = -EIO; |
8b0044571 [PATCH] dm crypt:... |
897 |
/* |
6712ecf8f Drop 'size' argum... |
898 |
* free the processed pages |
8b0044571 [PATCH] dm crypt:... |
899 |
*/ |
ee7a491e6 dm crypt: tidy cr... |
900 |
if (rw == WRITE) |
644bd2f04 Fix memory leak i... |
901 |
crypt_free_buffer_pages(cc, clone); |
8b0044571 [PATCH] dm crypt:... |
902 903 |
bio_put(clone); |
8b0044571 [PATCH] dm crypt:... |
904 |
|
ee7a491e6 dm crypt: tidy cr... |
905 906 907 908 |
if (rw == READ && !error) { kcryptd_queue_crypt(io); return; } |
5742fd777 dm crypt: move er... |
909 910 911 912 913 |
if (unlikely(error)) io->error = error; crypt_dec_pending(io); |
8b0044571 [PATCH] dm crypt:... |
914 |
} |
028867ac2 dm: use kmem_cach... |
915 |
static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b0044571 [PATCH] dm crypt:... |
916 917 918 919 920 921 922 |
{ struct crypt_config *cc = io->target->private; clone->bi_private = io; clone->bi_end_io = crypt_endio; clone->bi_bdev = cc->dev->bdev; clone->bi_rw = io->base_bio->bi_rw; |
027581f35 dm crypt: fix cal... |
923 |
clone->bi_destructor = dm_crypt_bio_destructor; |
8b0044571 [PATCH] dm crypt:... |
924 |
} |
20c82538e dm crypt: use io ... |
925 |
static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b0044571 [PATCH] dm crypt:... |
926 927 928 929 |
{ struct crypt_config *cc = io->target->private; struct bio *base_bio = io->base_bio; struct bio *clone; |
93e605c23 [PATCH] dm crypt:... |
930 |
|
8b0044571 [PATCH] dm crypt:... |
931 932 933 934 935 |
/* * The block layer might modify the bvec array, so always * copy the required bvecs because we need the original * one in order to decrypt the whole bio data *afterwards*. */ |
20c82538e dm crypt: use io ... |
936 |
clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); |
7eaceacca block: remove per... |
937 |
if (!clone) |
20c82538e dm crypt: use io ... |
938 |
return 1; |
8b0044571 [PATCH] dm crypt:... |
939 |
|
20c82538e dm crypt: use io ... |
940 |
crypt_inc_pending(io); |
8b0044571 [PATCH] dm crypt:... |
941 942 943 944 |
clone_init(io, clone); clone->bi_idx = 0; clone->bi_vcnt = bio_segments(base_bio); clone->bi_size = base_bio->bi_size; |
0c395b0f8 dm crypt: store s... |
945 |
clone->bi_sector = cc->start + io->sector; |
8b0044571 [PATCH] dm crypt:... |
946 947 |
memcpy(clone->bi_io_vec, bio_iovec(base_bio), sizeof(struct bio_vec) * clone->bi_vcnt); |
8b0044571 [PATCH] dm crypt:... |
948 |
|
93e605c23 [PATCH] dm crypt:... |
949 |
generic_make_request(clone); |
20c82538e dm crypt: use io ... |
950 |
return 0; |
8b0044571 [PATCH] dm crypt:... |
951 |
} |
4e4eef64e dm crypt: adjust ... |
952 953 |
static void kcryptd_io_write(struct dm_crypt_io *io) { |
95497a960 dm crypt: prepare... |
954 |
struct bio *clone = io->ctx.bio_out; |
95497a960 dm crypt: prepare... |
955 |
generic_make_request(clone); |
4e4eef64e dm crypt: adjust ... |
956 |
} |
395b167ca dm crypt: move qu... |
957 958 959 |
static void kcryptd_io(struct work_struct *work) { struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
20c82538e dm crypt: use io ... |
960 961 962 963 964 965 |
if (bio_data_dir(io->base_bio) == READ) { crypt_inc_pending(io); if (kcryptd_io_read(io, GFP_NOIO)) io->error = -ENOMEM; crypt_dec_pending(io); } else |
395b167ca dm crypt: move qu... |
966 967 968 969 970 971 972 973 974 975 |
kcryptd_io_write(io); } static void kcryptd_queue_io(struct dm_crypt_io *io) { struct crypt_config *cc = io->target->private; INIT_WORK(&io->work, kcryptd_io); queue_work(cc->io_queue, &io->work); } |
95497a960 dm crypt: prepare... |
976 977 |
static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error, int async) |
4e4eef64e dm crypt: adjust ... |
978 |
{ |
dec1cedf9 dm crypt: abstrac... |
979 980 981 982 983 984 985 |
struct bio *clone = io->ctx.bio_out; struct crypt_config *cc = io->target->private; if (unlikely(error < 0)) { crypt_free_buffer_pages(cc, clone); bio_put(clone); io->error = -EIO; |
6c031f41d dm crypt: move de... |
986 |
crypt_dec_pending(io); |
dec1cedf9 dm crypt: abstrac... |
987 988 989 990 991 992 993 |
return; } /* crypt_convert should have filled the clone bio */ BUG_ON(io->ctx.idx_out < clone->bi_vcnt); clone->bi_sector = cc->start + io->sector; |
899c95d36 dm crypt: tidy io... |
994 |
|
95497a960 dm crypt: prepare... |
995 996 |
if (async) kcryptd_queue_io(io); |
1e37bb8e5 dm crypt: remove ... |
997 |
else |
95497a960 dm crypt: prepare... |
998 |
generic_make_request(clone); |
4e4eef64e dm crypt: adjust ... |
999 |
} |
fc5a5e9aa dm crypt: tidy wr... |
1000 |
static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b0044571 [PATCH] dm crypt:... |
1001 1002 |
{ struct crypt_config *cc = io->target->private; |
8b0044571 [PATCH] dm crypt:... |
1003 |
struct bio *clone; |
393b47ef2 dm crypt: fix asy... |
1004 |
struct dm_crypt_io *new_io; |
c8081618a dm crypt: tidy ct... |
1005 |
int crypt_finished; |
933f01d43 dm crypt: avoid u... |
1006 |
unsigned out_of_pages = 0; |
dec1cedf9 dm crypt: abstrac... |
1007 |
unsigned remaining = io->base_bio->bi_size; |
b635b00e0 dm crypt: tidy se... |
1008 |
sector_t sector = io->sector; |
dec1cedf9 dm crypt: abstrac... |
1009 |
int r; |
8b0044571 [PATCH] dm crypt:... |
1010 |
|
93e605c23 [PATCH] dm crypt:... |
1011 |
/* |
fc5a5e9aa dm crypt: tidy wr... |
1012 1013 1014 |
* Prevent io from disappearing until this function completes. */ crypt_inc_pending(io); |
b635b00e0 dm crypt: tidy se... |
1015 |
crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9aa dm crypt: tidy wr... |
1016 1017 |
/* |
93e605c23 [PATCH] dm crypt:... |
1018 1019 1020 1021 |
* The allocated buffers can be smaller than the whole bio, * so repeat the whole process until all the data can be handled. */ while (remaining) { |
933f01d43 dm crypt: avoid u... |
1022 |
clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d2 [PATCH] dm crypt:... |
1023 |
if (unlikely(!clone)) { |
5742fd777 dm crypt: move er... |
1024 |
io->error = -ENOMEM; |
fc5a5e9aa dm crypt: tidy wr... |
1025 |
break; |
23541d2d2 [PATCH] dm crypt:... |
1026 |
} |
93e605c23 [PATCH] dm crypt:... |
1027 |
|
53017030e dm crypt: move co... |
1028 1029 |
io->ctx.bio_out = clone; io->ctx.idx_out = 0; |
93e605c23 [PATCH] dm crypt:... |
1030 |
|
dec1cedf9 dm crypt: abstrac... |
1031 |
remaining -= clone->bi_size; |
b635b00e0 dm crypt: tidy se... |
1032 |
sector += bio_sectors(clone); |
93e605c23 [PATCH] dm crypt:... |
1033 |
|
4e5940989 dm crypt: fix asy... |
1034 |
crypt_inc_pending(io); |
dec1cedf9 dm crypt: abstrac... |
1035 |
r = crypt_convert(cc, &io->ctx); |
c8081618a dm crypt: tidy ct... |
1036 |
crypt_finished = atomic_dec_and_test(&io->ctx.pending); |
f97380bca dm crypt: use sma... |
1037 |
|
c8081618a dm crypt: tidy ct... |
1038 1039 |
/* Encryption was already finished, submit io now */ if (crypt_finished) { |
3a7f6c990 dm crypt: use asy... |
1040 |
kcryptd_crypt_write_io_submit(io, r, 0); |
c8081618a dm crypt: tidy ct... |
1041 1042 1043 1044 1045 |
/* * If there was an error, do not try next fragments. * For async, error is processed in async handler. */ |
6c031f41d dm crypt: move de... |
1046 |
if (unlikely(r < 0)) |
fc5a5e9aa dm crypt: tidy wr... |
1047 |
break; |
b635b00e0 dm crypt: tidy se... |
1048 1049 |
io->sector = sector; |
4e5940989 dm crypt: fix asy... |
1050 |
} |
93e605c23 [PATCH] dm crypt:... |
1051 |
|
933f01d43 dm crypt: avoid u... |
1052 1053 1054 1055 1056 |
/* * Out of memory -> run queues * But don't wait if split was due to the io size restriction */ if (unlikely(out_of_pages)) |
8aa7e847d Fix congestion_wa... |
1057 |
congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d43 dm crypt: avoid u... |
1058 |
|
393b47ef2 dm crypt: fix asy... |
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 |
/* * With async crypto it is unsafe to share the crypto context * between fragments, so switch to a new dm_crypt_io structure. */ if (unlikely(!crypt_finished && remaining)) { new_io = crypt_io_alloc(io->target, io->base_bio, sector); crypt_inc_pending(new_io); crypt_convert_init(cc, &new_io->ctx, NULL, io->base_bio, sector); new_io->ctx.idx_in = io->ctx.idx_in; new_io->ctx.offset_in = io->ctx.offset_in; /* * Fragments after the first use the base_io * pending count. */ if (!io->base_io) new_io->base_io = io; else { new_io->base_io = io->base_io; crypt_inc_pending(io->base_io); crypt_dec_pending(io); } io = new_io; } |
93e605c23 [PATCH] dm crypt:... |
1086 |
} |
899c95d36 dm crypt: tidy io... |
1087 1088 |
crypt_dec_pending(io); |
84131db68 dm crypt: introdu... |
1089 |
} |
4e4eef64e dm crypt: adjust ... |
1090 |
static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error) |
5742fd777 dm crypt: move er... |
1091 1092 1093 1094 1095 1096 |
{ if (unlikely(error < 0)) io->error = -EIO; crypt_dec_pending(io); } |
4e4eef64e dm crypt: adjust ... |
1097 |
static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b0044571 [PATCH] dm crypt:... |
1098 1099 |
{ struct crypt_config *cc = io->target->private; |
5742fd777 dm crypt: move er... |
1100 |
int r = 0; |
1da177e4c Linux-2.6.12-rc2 |
1101 |
|
3e1a8bdd0 dm crypt: tidy in... |
1102 |
crypt_inc_pending(io); |
3a7f6c990 dm crypt: use asy... |
1103 |
|
53017030e dm crypt: move co... |
1104 |
crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f8 dm crypt: store s... |
1105 |
io->sector); |
1da177e4c Linux-2.6.12-rc2 |
1106 |
|
5742fd777 dm crypt: move er... |
1107 |
r = crypt_convert(cc, &io->ctx); |
3f1e9070f dm crypt: fix ctx... |
1108 |
if (atomic_dec_and_test(&io->ctx.pending)) |
3a7f6c990 dm crypt: use asy... |
1109 1110 1111 |
kcryptd_crypt_read_done(io, r); crypt_dec_pending(io); |
1da177e4c Linux-2.6.12-rc2 |
1112 |
} |
95497a960 dm crypt: prepare... |
1113 1114 1115 |
static void kcryptd_async_done(struct crypto_async_request *async_req, int error) { |
b2174eebd dm crypt: fix kcr... |
1116 1117 |
struct dm_crypt_request *dmreq = async_req->data; struct convert_context *ctx = dmreq->ctx; |
95497a960 dm crypt: prepare... |
1118 1119 1120 1121 1122 1123 1124 |
struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); struct crypt_config *cc = io->target->private; if (error == -EINPROGRESS) { complete(&ctx->restart); return; } |
2dc5327d3 dm crypt: add pos... |
1125 1126 |
if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); |
b2174eebd dm crypt: fix kcr... |
1127 |
mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a960 dm crypt: prepare... |
1128 1129 1130 1131 1132 1133 1134 1135 1136 |
if (!atomic_dec_and_test(&ctx->pending)) return; if (bio_data_dir(io->base_bio) == READ) kcryptd_crypt_read_done(io, error); else kcryptd_crypt_write_io_submit(io, error, 1); } |
395b167ca dm crypt: move qu... |
1137 |
static void kcryptd_crypt(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
1138 |
{ |
028867ac2 dm: use kmem_cach... |
1139 |
struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b0044571 [PATCH] dm crypt:... |
1140 |
|
cabf08e4d dm crypt: add pos... |
1141 |
if (bio_data_dir(io->base_bio) == READ) |
395b167ca dm crypt: move qu... |
1142 |
kcryptd_crypt_read_convert(io); |
4e4eef64e dm crypt: adjust ... |
1143 |
else |
395b167ca dm crypt: move qu... |
1144 |
kcryptd_crypt_write_convert(io); |
cabf08e4d dm crypt: add pos... |
1145 |
} |
395b167ca dm crypt: move qu... |
1146 |
static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4d dm crypt: add pos... |
1147 |
{ |
395b167ca dm crypt: move qu... |
1148 |
struct crypt_config *cc = io->target->private; |
cabf08e4d dm crypt: add pos... |
1149 |
|
395b167ca dm crypt: move qu... |
1150 1151 |
INIT_WORK(&io->work, kcryptd_crypt); queue_work(cc->crypt_queue, &io->work); |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 |
} /* * Decode key from its hex representation */ static int crypt_decode_key(u8 *key, char *hex, unsigned int size) { char buffer[3]; char *endp; unsigned int i; buffer[2] = '\0'; |
8b0044571 [PATCH] dm crypt:... |
1164 |
for (i = 0; i < size; i++) { |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 |
buffer[0] = *hex++; buffer[1] = *hex++; key[i] = (u8)simple_strtoul(buffer, &endp, 16); if (endp != &buffer[2]) return -EINVAL; } if (*hex != '\0') return -EINVAL; return 0; } /* * Encode key into its hex representation */ static void crypt_encode_key(char *hex, u8 *key, unsigned int size) { unsigned int i; |
8b0044571 [PATCH] dm crypt:... |
1186 |
for (i = 0; i < size; i++) { |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 1189 1190 1191 |
sprintf(hex, "%02x", *key); hex += 2; key++; } } |
d1f964238 dm crypt: add mul... |
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 |
static void crypt_free_tfms(struct crypt_config *cc, int cpu) { struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); unsigned i; for (i = 0; i < cc->tfms_count; i++) if (cpu_cc->tfms[i] && !IS_ERR(cpu_cc->tfms[i])) { crypto_free_ablkcipher(cpu_cc->tfms[i]); cpu_cc->tfms[i] = NULL; } } static int crypt_alloc_tfms(struct crypt_config *cc, int cpu, char *ciphermode) { struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); unsigned i; int err; for (i = 0; i < cc->tfms_count; i++) { cpu_cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); if (IS_ERR(cpu_cc->tfms[i])) { err = PTR_ERR(cpu_cc->tfms[i]); crypt_free_tfms(cc, cpu); return err; } } return 0; } |
c02977212 dm crypt: scale t... |
1221 1222 |
static int crypt_setkey_allcpus(struct crypt_config *cc) { |
d1f964238 dm crypt: add mul... |
1223 1224 |
unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); int cpu, err = 0, i, r; |
c02977212 dm crypt: scale t... |
1225 1226 |
for_each_possible_cpu(cpu) { |
d1f964238 dm crypt: add mul... |
1227 1228 1229 1230 1231 1232 |
for (i = 0; i < cc->tfms_count; i++) { r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfms[i], cc->key + (i * subkey_size), subkey_size); if (r) err = r; } |
c02977212 dm crypt: scale t... |
1233 1234 1235 1236 |
} return err; } |
e48d4bbf9 [PATCH] dm crypt:... |
1237 1238 |
static int crypt_set_key(struct crypt_config *cc, char *key) { |
de8be5ac7 dm crypt: wipe ke... |
1239 1240 |
int r = -EINVAL; int key_string_len = strlen(key); |
69a8cfcda dm crypt: set key... |
1241 |
/* The key size may not be changed. */ |
de8be5ac7 dm crypt: wipe ke... |
1242 1243 |
if (cc->key_size != (key_string_len >> 1)) goto out; |
e48d4bbf9 [PATCH] dm crypt:... |
1244 |
|
69a8cfcda dm crypt: set key... |
1245 1246 |
/* Hyphen (which gives a key_size of zero) means there is no key. */ if (!cc->key_size && strcmp(key, "-")) |
de8be5ac7 dm crypt: wipe ke... |
1247 |
goto out; |
e48d4bbf9 [PATCH] dm crypt:... |
1248 |
|
69a8cfcda dm crypt: set key... |
1249 |
if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac7 dm crypt: wipe ke... |
1250 |
goto out; |
e48d4bbf9 [PATCH] dm crypt:... |
1251 1252 |
set_bit(DM_CRYPT_KEY_VALID, &cc->flags); |
de8be5ac7 dm crypt: wipe ke... |
1253 1254 1255 1256 1257 1258 1259 |
r = crypt_setkey_allcpus(cc); out: /* Hex key string not needed after here, so wipe it. */ memset(key, '0', key_string_len); return r; |
e48d4bbf9 [PATCH] dm crypt:... |
1260 1261 1262 1263 1264 1265 |
} static int crypt_wipe_key(struct crypt_config *cc) { clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); memset(&cc->key, 0, cc->key_size * sizeof(u8)); |
c02977212 dm crypt: scale t... |
1266 1267 |
return crypt_setkey_allcpus(cc); |
e48d4bbf9 [PATCH] dm crypt:... |
1268 |
} |
28513fccf dm crypt: simplif... |
1269 1270 1271 |
static void crypt_dtr(struct dm_target *ti) { struct crypt_config *cc = ti->private; |
c02977212 dm crypt: scale t... |
1272 1273 |
struct crypt_cpu *cpu_cc; int cpu; |
28513fccf dm crypt: simplif... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 |
ti->private = NULL; if (!cc) return; if (cc->io_queue) destroy_workqueue(cc->io_queue); if (cc->crypt_queue) destroy_workqueue(cc->crypt_queue); |
c02977212 dm crypt: scale t... |
1284 1285 1286 1287 1288 |
if (cc->cpu) for_each_possible_cpu(cpu) { cpu_cc = per_cpu_ptr(cc->cpu, cpu); if (cpu_cc->req) mempool_free(cpu_cc->req, cc->req_pool); |
d1f964238 dm crypt: add mul... |
1289 |
crypt_free_tfms(cc, cpu); |
c02977212 dm crypt: scale t... |
1290 |
} |
28513fccf dm crypt: simplif... |
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 |
if (cc->bs) bioset_free(cc->bs); if (cc->page_pool) mempool_destroy(cc->page_pool); if (cc->req_pool) mempool_destroy(cc->req_pool); if (cc->io_pool) mempool_destroy(cc->io_pool); if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) cc->iv_gen_ops->dtr(cc); |
28513fccf dm crypt: simplif... |
1303 1304 |
if (cc->dev) dm_put_device(ti, cc->dev); |
c02977212 dm crypt: scale t... |
1305 1306 |
if (cc->cpu) free_percpu(cc->cpu); |
5ebaee6d2 dm crypt: simplif... |
1307 |
kzfree(cc->cipher); |
7dbcd1374 dm crypt: simplif... |
1308 |
kzfree(cc->cipher_string); |
28513fccf dm crypt: simplif... |
1309 1310 1311 1312 |
/* Must zero key material before freeing */ kzfree(cc); } |
5ebaee6d2 dm crypt: simplif... |
1313 1314 |
static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) |
1da177e4c Linux-2.6.12-rc2 |
1315 |
{ |
5ebaee6d2 dm crypt: simplif... |
1316 |
struct crypt_config *cc = ti->private; |
d1f964238 dm crypt: add mul... |
1317 |
char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d2 dm crypt: simplif... |
1318 |
char *cipher_api = NULL; |
c02977212 dm crypt: scale t... |
1319 |
int cpu, ret = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1320 |
|
5ebaee6d2 dm crypt: simplif... |
1321 1322 1323 |
/* Convert to crypto api definition? */ if (strchr(cipher_in, '(')) { ti->error = "Bad cipher specification"; |
1da177e4c Linux-2.6.12-rc2 |
1324 1325 |
return -EINVAL; } |
7dbcd1374 dm crypt: simplif... |
1326 1327 1328 |
cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); if (!cc->cipher_string) goto bad_mem; |
5ebaee6d2 dm crypt: simplif... |
1329 1330 |
/* * Legacy dm-crypt cipher specification |
d1f964238 dm crypt: add mul... |
1331 |
* cipher[:keycount]-mode-iv:ivopts |
5ebaee6d2 dm crypt: simplif... |
1332 1333 |
*/ tmp = cipher_in; |
d1f964238 dm crypt: add mul... |
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 |
keycount = strsep(&tmp, "-"); cipher = strsep(&keycount, ":"); if (!keycount) cc->tfms_count = 1; else if (sscanf(keycount, "%u", &cc->tfms_count) != 1 || !is_power_of_2(cc->tfms_count)) { ti->error = "Bad cipher key count specification"; return -EINVAL; } cc->key_parts = cc->tfms_count; |
5ebaee6d2 dm crypt: simplif... |
1345 1346 1347 1348 |
cc->cipher = kstrdup(cipher, GFP_KERNEL); if (!cc->cipher) goto bad_mem; |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 1351 1352 1353 |
chainmode = strsep(&tmp, "-"); ivopts = strsep(&tmp, "-"); ivmode = strsep(&ivopts, ":"); if (tmp) |
5ebaee6d2 dm crypt: simplif... |
1354 |
DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4c Linux-2.6.12-rc2 |
1355 |
|
d1f964238 dm crypt: add mul... |
1356 1357 1358 |
cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)) + cc->tfms_count * sizeof(*(cc->cpu->tfms)), __alignof__(struct crypt_cpu)); |
c02977212 dm crypt: scale t... |
1359 1360 1361 1362 |
if (!cc->cpu) { ti->error = "Cannot allocate per cpu state"; goto bad_mem; } |
7dbcd1374 dm crypt: simplif... |
1363 1364 1365 1366 |
/* * For compatibility with the original dm-crypt mapping format, if * only the cipher name is supplied, use cbc-plain. */ |
5ebaee6d2 dm crypt: simplif... |
1367 |
if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4c Linux-2.6.12-rc2 |
1368 1369 1370 |
chainmode = "cbc"; ivmode = "plain"; } |
d1806f6a9 [BLOCK] dm-crypt:... |
1371 |
if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d2 dm crypt: simplif... |
1372 1373 |
ti->error = "IV mechanism required"; return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1374 |
} |
5ebaee6d2 dm crypt: simplif... |
1375 1376 1377 1378 1379 1380 1381 1382 1383 |
cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); if (!cipher_api) goto bad_mem; ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, cipher); if (ret < 0) { kfree(cipher_api); goto bad_mem; |
1da177e4c Linux-2.6.12-rc2 |
1384 |
} |
5ebaee6d2 dm crypt: simplif... |
1385 |
/* Allocate cipher */ |
c02977212 dm crypt: scale t... |
1386 |
for_each_possible_cpu(cpu) { |
d1f964238 dm crypt: add mul... |
1387 1388 |
ret = crypt_alloc_tfms(cc, cpu, cipher_api); if (ret < 0) { |
c02977212 dm crypt: scale t... |
1389 1390 1391 |
ti->error = "Error allocating crypto tfm"; goto bad; } |
1da177e4c Linux-2.6.12-rc2 |
1392 |
} |
1da177e4c Linux-2.6.12-rc2 |
1393 |
|
5ebaee6d2 dm crypt: simplif... |
1394 1395 |
/* Initialize and set key */ ret = crypt_set_key(cc, key); |
28513fccf dm crypt: simplif... |
1396 |
if (ret < 0) { |
0b4309581 dm crypt: make wi... |
1397 |
ti->error = "Error decoding and setting key"; |
28513fccf dm crypt: simplif... |
1398 |
goto bad; |
0b4309581 dm crypt: make wi... |
1399 |
} |
5ebaee6d2 dm crypt: simplif... |
1400 |
/* Initialize IV */ |
c02977212 dm crypt: scale t... |
1401 |
cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d2 dm crypt: simplif... |
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 |
if (cc->iv_size) /* at least a 64 bit sector number should fit in our buffer */ cc->iv_size = max(cc->iv_size, (unsigned int)(sizeof(u64) / sizeof(u8))); else if (ivmode) { DMWARN("Selected cipher does not support IVs"); ivmode = NULL; } /* Choose ivmode, see comments at iv code. */ |
1da177e4c Linux-2.6.12-rc2 |
1412 1413 1414 1415 |
if (ivmode == NULL) cc->iv_gen_ops = NULL; else if (strcmp(ivmode, "plain") == 0) cc->iv_gen_ops = &crypt_iv_plain_ops; |
61afef614 dm crypt: add pla... |
1416 1417 |
else if (strcmp(ivmode, "plain64") == 0) cc->iv_gen_ops = &crypt_iv_plain64_ops; |
1da177e4c Linux-2.6.12-rc2 |
1418 1419 |
else if (strcmp(ivmode, "essiv") == 0) cc->iv_gen_ops = &crypt_iv_essiv_ops; |
48527fa7c [BLOCK] dm-crypt:... |
1420 1421 |
else if (strcmp(ivmode, "benbi") == 0) cc->iv_gen_ops = &crypt_iv_benbi_ops; |
46b477306 dm crypt: add nul... |
1422 1423 |
else if (strcmp(ivmode, "null") == 0) cc->iv_gen_ops = &crypt_iv_null_ops; |
347457859 dm crypt: add loo... |
1424 1425 1426 1427 1428 1429 1430 1431 1432 |
else if (strcmp(ivmode, "lmk") == 0) { cc->iv_gen_ops = &crypt_iv_lmk_ops; /* Version 2 and 3 is recognised according * to length of provided multi-key string. * If present (version 3), last key is used as IV seed. */ if (cc->key_size % cc->key_parts) cc->key_parts++; } else { |
5ebaee6d2 dm crypt: simplif... |
1433 |
ret = -EINVAL; |
72d948616 [PATCH] dm: impro... |
1434 |
ti->error = "Invalid IV mode"; |
28513fccf dm crypt: simplif... |
1435 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1436 |
} |
28513fccf dm crypt: simplif... |
1437 1438 1439 1440 1441 1442 1443 1444 |
/* Allocate IV */ if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); if (ret < 0) { ti->error = "Error creating IV"; goto bad; } } |
1da177e4c Linux-2.6.12-rc2 |
1445 |
|
28513fccf dm crypt: simplif... |
1446 1447 1448 1449 1450 1451 1452 |
/* Initialize IV (set keys for ESSIV etc) */ if (cc->iv_gen_ops && cc->iv_gen_ops->init) { ret = cc->iv_gen_ops->init(cc); if (ret < 0) { ti->error = "Error initialising IV"; goto bad; } |
b95bf2d3d dm crypt: separat... |
1453 |
} |
5ebaee6d2 dm crypt: simplif... |
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 |
ret = 0; bad: kfree(cipher_api); return ret; bad_mem: ti->error = "Cannot allocate cipher strings"; return -ENOMEM; } /* * Construct an encryption mapping: * <cipher> <key> <iv_offset> <dev_path> <start> */ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) { struct crypt_config *cc; |
772ae5f54 dm crypt: optiona... |
1471 |
unsigned int key_size, opt_params; |
5ebaee6d2 dm crypt: simplif... |
1472 1473 |
unsigned long long tmpll; int ret; |
772ae5f54 dm crypt: optiona... |
1474 1475 1476 1477 1478 1479 |
struct dm_arg_set as; const char *opt_string; static struct dm_arg _args[] = { {0, 1, "Invalid number of feature args"}, }; |
5ebaee6d2 dm crypt: simplif... |
1480 |
|
772ae5f54 dm crypt: optiona... |
1481 |
if (argc < 5) { |
5ebaee6d2 dm crypt: simplif... |
1482 1483 |
ti->error = "Not enough arguments"; return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1484 |
} |
5ebaee6d2 dm crypt: simplif... |
1485 1486 1487 1488 1489 1490 1491 |
key_size = strlen(argv[1]) >> 1; cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); if (!cc) { ti->error = "Cannot allocate encryption context"; return -ENOMEM; } |
69a8cfcda dm crypt: set key... |
1492 |
cc->key_size = key_size; |
5ebaee6d2 dm crypt: simplif... |
1493 1494 1495 1496 1497 |
ti->private = cc; ret = crypt_ctr_cipher(ti, argv[0], argv[1]); if (ret < 0) goto bad; |
28513fccf dm crypt: simplif... |
1498 |
ret = -ENOMEM; |
93d2341c7 [PATCH] mempool: ... |
1499 |
cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4c Linux-2.6.12-rc2 |
1500 |
if (!cc->io_pool) { |
72d948616 [PATCH] dm: impro... |
1501 |
ti->error = "Cannot allocate crypt io mempool"; |
28513fccf dm crypt: simplif... |
1502 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1503 |
} |
ddd42edfd dm crypt: add asy... |
1504 |
cc->dmreq_start = sizeof(struct ablkcipher_request); |
c02977212 dm crypt: scale t... |
1505 |
cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edfd dm crypt: add asy... |
1506 |
cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c02977212 dm crypt: scale t... |
1507 |
cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c990 dm crypt: use asy... |
1508 |
~(crypto_tfm_ctx_alignment() - 1); |
ddd42edfd dm crypt: add asy... |
1509 1510 1511 1512 1513 |
cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + sizeof(struct dm_crypt_request) + cc->iv_size); if (!cc->req_pool) { ti->error = "Cannot allocate crypt request mempool"; |
28513fccf dm crypt: simplif... |
1514 |
goto bad; |
ddd42edfd dm crypt: add asy... |
1515 |
} |
ddd42edfd dm crypt: add asy... |
1516 |
|
a19b27ce3 [PATCH] mempool: ... |
1517 |
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4c Linux-2.6.12-rc2 |
1518 |
if (!cc->page_pool) { |
72d948616 [PATCH] dm: impro... |
1519 |
ti->error = "Cannot allocate page mempool"; |
28513fccf dm crypt: simplif... |
1520 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1521 |
} |
bb799ca02 bio: allow indivi... |
1522 |
cc->bs = bioset_create(MIN_IOS, 0); |
6a24c7184 [PATCH] dm crypt:... |
1523 1524 |
if (!cc->bs) { ti->error = "Cannot allocate crypt bioset"; |
28513fccf dm crypt: simplif... |
1525 |
goto bad; |
6a24c7184 [PATCH] dm crypt:... |
1526 |
} |
28513fccf dm crypt: simplif... |
1527 |
ret = -EINVAL; |
4ee218cd6 [PATCH] dm: remov... |
1528 |
if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d948616 [PATCH] dm: impro... |
1529 |
ti->error = "Invalid iv_offset sector"; |
28513fccf dm crypt: simplif... |
1530 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1531 |
} |
4ee218cd6 [PATCH] dm: remov... |
1532 |
cc->iv_offset = tmpll; |
1da177e4c Linux-2.6.12-rc2 |
1533 |
|
28513fccf dm crypt: simplif... |
1534 1535 1536 1537 |
if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { ti->error = "Device lookup failed"; goto bad; } |
4ee218cd6 [PATCH] dm: remov... |
1538 |
if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d948616 [PATCH] dm: impro... |
1539 |
ti->error = "Invalid device sector"; |
28513fccf dm crypt: simplif... |
1540 |
goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1541 |
} |
4ee218cd6 [PATCH] dm: remov... |
1542 |
cc->start = tmpll; |
1da177e4c Linux-2.6.12-rc2 |
1543 |
|
772ae5f54 dm crypt: optiona... |
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 |
argv += 5; argc -= 5; /* Optional parameters */ if (argc) { as.argc = argc; as.argv = argv; ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); if (ret) goto bad; opt_string = dm_shift_arg(&as); if (opt_params == 1 && opt_string && !strcasecmp(opt_string, "allow_discards")) ti->num_discard_requests = 1; else if (opt_params) { ret = -EINVAL; ti->error = "Invalid feature arguments"; goto bad; } } |
28513fccf dm crypt: simplif... |
1567 |
ret = -ENOMEM; |
c02977212 dm crypt: scale t... |
1568 1569 1570 1571 |
cc->io_queue = alloc_workqueue("kcryptd_io", WQ_NON_REENTRANT| WQ_MEM_RECLAIM, 1); |
cabf08e4d dm crypt: add pos... |
1572 1573 |
if (!cc->io_queue) { ti->error = "Couldn't create kcryptd io queue"; |
28513fccf dm crypt: simplif... |
1574 |
goto bad; |
cabf08e4d dm crypt: add pos... |
1575 |
} |
c02977212 dm crypt: scale t... |
1576 1577 1578 1579 1580 |
cc->crypt_queue = alloc_workqueue("kcryptd", WQ_NON_REENTRANT| WQ_CPU_INTENSIVE| WQ_MEM_RECLAIM, 1); |
cabf08e4d dm crypt: add pos... |
1581 |
if (!cc->crypt_queue) { |
9934a8bea dm crypt: use per... |
1582 |
ti->error = "Couldn't create kcryptd queue"; |
28513fccf dm crypt: simplif... |
1583 |
goto bad; |
9934a8bea dm crypt: use per... |
1584 |
} |
647c7db14 dm crypt: support... |
1585 |
ti->num_flush_requests = 1; |
983c7db34 dm crypt: always ... |
1586 |
ti->discard_zeroes_data_unsupported = 1; |
1da177e4c Linux-2.6.12-rc2 |
1587 |
return 0; |
28513fccf dm crypt: simplif... |
1588 1589 1590 |
bad: crypt_dtr(ti); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1591 |
} |
1da177e4c Linux-2.6.12-rc2 |
1592 1593 1594 |
static int crypt_map(struct dm_target *ti, struct bio *bio, union map_info *map_context) { |
028867ac2 dm: use kmem_cach... |
1595 |
struct dm_crypt_io *io; |
647c7db14 dm crypt: support... |
1596 |
struct crypt_config *cc; |
772ae5f54 dm crypt: optiona... |
1597 1598 1599 1600 1601 1602 |
/* * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight * - for REQ_DISCARD caller must use flush if IO ordering matters */ if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { |
647c7db14 dm crypt: support... |
1603 1604 |
cc = ti->private; bio->bi_bdev = cc->dev->bdev; |
772ae5f54 dm crypt: optiona... |
1605 1606 |
if (bio_sectors(bio)) bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); |
647c7db14 dm crypt: support... |
1607 1608 |
return DM_MAPIO_REMAPPED; } |
1da177e4c Linux-2.6.12-rc2 |
1609 |
|
b441a262e dm: use dm_target... |
1610 |
io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4d dm crypt: add pos... |
1611 |
|
20c82538e dm crypt: use io ... |
1612 1613 1614 1615 |
if (bio_data_dir(io->base_bio) == READ) { if (kcryptd_io_read(io, GFP_NOWAIT)) kcryptd_queue_io(io); } else |
cabf08e4d dm crypt: add pos... |
1616 |
kcryptd_queue_crypt(io); |
1da177e4c Linux-2.6.12-rc2 |
1617 |
|
d2a7ad29a [PATCH] dm: map a... |
1618 |
return DM_MAPIO_SUBMITTED; |
1da177e4c Linux-2.6.12-rc2 |
1619 1620 1621 1622 1623 |
} static int crypt_status(struct dm_target *ti, status_type_t type, char *result, unsigned int maxlen) { |
5ebaee6d2 dm crypt: simplif... |
1624 |
struct crypt_config *cc = ti->private; |
1da177e4c Linux-2.6.12-rc2 |
1625 1626 1627 1628 1629 1630 1631 1632 |
unsigned int sz = 0; switch (type) { case STATUSTYPE_INFO: result[0] = '\0'; break; case STATUSTYPE_TABLE: |
7dbcd1374 dm crypt: simplif... |
1633 |
DMEMIT("%s ", cc->cipher_string); |
1da177e4c Linux-2.6.12-rc2 |
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 |
if (cc->key_size > 0) { if ((maxlen - sz) < ((cc->key_size << 1) + 1)) return -ENOMEM; crypt_encode_key(result + sz, cc->key, cc->key_size); sz += cc->key_size << 1; } else { if (sz >= maxlen) return -ENOMEM; result[sz++] = '-'; } |
4ee218cd6 [PATCH] dm: remov... |
1646 1647 |
DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, cc->dev->name, (unsigned long long)cc->start); |
772ae5f54 dm crypt: optiona... |
1648 1649 1650 |
if (ti->num_discard_requests) DMEMIT(" 1 allow_discards"); |
1da177e4c Linux-2.6.12-rc2 |
1651 1652 1653 1654 |
break; } return 0; } |
e48d4bbf9 [PATCH] dm crypt:... |
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 |
static void crypt_postsuspend(struct dm_target *ti) { struct crypt_config *cc = ti->private; set_bit(DM_CRYPT_SUSPENDED, &cc->flags); } static int crypt_preresume(struct dm_target *ti) { struct crypt_config *cc = ti->private; if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { DMERR("aborting resume - crypt key is not set."); return -EAGAIN; } return 0; } static void crypt_resume(struct dm_target *ti) { struct crypt_config *cc = ti->private; clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); } /* Message interface * key set <key> * key wipe */ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) { struct crypt_config *cc = ti->private; |
542da3176 dm crypt: make wi... |
1688 |
int ret = -EINVAL; |
e48d4bbf9 [PATCH] dm crypt:... |
1689 1690 1691 |
if (argc < 2) goto error; |
498f0103e dm table: share t... |
1692 |
if (!strcasecmp(argv[0], "key")) { |
e48d4bbf9 [PATCH] dm crypt:... |
1693 1694 1695 1696 |
if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { DMWARN("not suspended during key manipulation."); return -EINVAL; } |
498f0103e dm table: share t... |
1697 |
if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da3176 dm crypt: make wi... |
1698 1699 1700 1701 1702 1703 1704 |
ret = crypt_set_key(cc, argv[2]); if (ret) return ret; if (cc->iv_gen_ops && cc->iv_gen_ops->init) ret = cc->iv_gen_ops->init(cc); return ret; } |
498f0103e dm table: share t... |
1705 |
if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da3176 dm crypt: make wi... |
1706 1707 1708 1709 1710 |
if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { ret = cc->iv_gen_ops->wipe(cc); if (ret) return ret; } |
e48d4bbf9 [PATCH] dm crypt:... |
1711 |
return crypt_wipe_key(cc); |
542da3176 dm crypt: make wi... |
1712 |
} |
e48d4bbf9 [PATCH] dm crypt:... |
1713 1714 1715 1716 1717 1718 |
} error: DMWARN("unrecognised message received."); return -EINVAL; } |
d41e26b90 dm crypt: add merge |
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 |
static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, struct bio_vec *biovec, int max_size) { struct crypt_config *cc = ti->private; struct request_queue *q = bdev_get_queue(cc->dev->bdev); if (!q->merge_bvec_fn) return max_size; bvm->bi_bdev = cc->dev->bdev; |
b441a262e dm: use dm_target... |
1729 |
bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b90 dm crypt: add merge |
1730 1731 1732 |
return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); } |
af4874e03 dm target:s intro... |
1733 1734 1735 1736 |
static int crypt_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { struct crypt_config *cc = ti->private; |
5dea271b6 dm table: pass co... |
1737 |
return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e03 dm target:s intro... |
1738 |
} |
1da177e4c Linux-2.6.12-rc2 |
1739 1740 |
static struct target_type crypt_target = { .name = "crypt", |
772ae5f54 dm crypt: optiona... |
1741 |
.version = {1, 11, 0}, |
1da177e4c Linux-2.6.12-rc2 |
1742 1743 1744 1745 1746 |
.module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr, .map = crypt_map, .status = crypt_status, |
e48d4bbf9 [PATCH] dm crypt:... |
1747 1748 1749 1750 |
.postsuspend = crypt_postsuspend, .preresume = crypt_preresume, .resume = crypt_resume, .message = crypt_message, |
d41e26b90 dm crypt: add merge |
1751 |
.merge = crypt_merge, |
af4874e03 dm target:s intro... |
1752 |
.iterate_devices = crypt_iterate_devices, |
1da177e4c Linux-2.6.12-rc2 |
1753 1754 1755 1756 1757 |
}; static int __init dm_crypt_init(void) { int r; |
028867ac2 dm: use kmem_cach... |
1758 |
_crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4c Linux-2.6.12-rc2 |
1759 1760 |
if (!_crypt_io_pool) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 |
r = dm_register_target(&crypt_target); if (r < 0) { |
72d948616 [PATCH] dm: impro... |
1763 |
DMERR("register failed %d", r); |
9934a8bea dm crypt: use per... |
1764 |
kmem_cache_destroy(_crypt_io_pool); |
1da177e4c Linux-2.6.12-rc2 |
1765 |
} |
1da177e4c Linux-2.6.12-rc2 |
1766 1767 1768 1769 1770 |
return r; } static void __exit dm_crypt_exit(void) { |
10d3bd09a dm: consolidate t... |
1771 |
dm_unregister_target(&crypt_target); |
1da177e4c Linux-2.6.12-rc2 |
1772 1773 1774 1775 1776 1777 1778 1779 1780 |
kmem_cache_destroy(_crypt_io_pool); } module_init(dm_crypt_init); module_exit(dm_crypt_exit); MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); MODULE_LICENSE("GPL"); |