11da177e4SLinus Torvalds /* 2bf14299fSJana Saout * Copyright (C) 2003 Jana Saout <jana@saout.de> 31da177e4SLinus Torvalds * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> 4542da317SMilan Broz * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved. 5ed04d981SMilan Broz * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * This file is released under the GPL. 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 1043d69034SMilan Broz #include <linux/completion.h> 11d1806f6aSHerbert Xu #include <linux/err.h> 121da177e4SLinus Torvalds #include <linux/module.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/bio.h> 161da177e4SLinus Torvalds #include <linux/blkdev.h> 171da177e4SLinus Torvalds #include <linux/mempool.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/crypto.h> 201da177e4SLinus Torvalds #include <linux/workqueue.h> 21dc267621SMikulas Patocka #include <linux/kthread.h> 223fcfab16SAndrew Morton #include <linux/backing-dev.h> 2360063497SArun Sharma #include <linux/atomic.h> 24378f058cSDavid Hardeman #include <linux/scatterlist.h> 25b3c5fd30SMikulas Patocka #include <linux/rbtree.h> 261da177e4SLinus Torvalds #include <asm/page.h> 2748527fa7SRik Snel #include <asm/unaligned.h> 2834745785SMilan Broz #include <crypto/hash.h> 2934745785SMilan Broz #include <crypto/md5.h> 3034745785SMilan Broz #include <crypto/algapi.h> 311da177e4SLinus Torvalds 32586e80e6SMikulas Patocka #include <linux/device-mapper.h> 331da177e4SLinus Torvalds 3472d94861SAlasdair G Kergon #define DM_MSG_PREFIX "crypt" 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds /* 371da177e4SLinus Torvalds * context holding the current state of a multi-part conversion 381da177e4SLinus Torvalds */ 391da177e4SLinus Torvalds struct convert_context { 4043d69034SMilan Broz struct completion restart; 411da177e4SLinus Torvalds struct bio *bio_in; 421da177e4SLinus Torvalds struct bio *bio_out; 43003b5c57SKent Overstreet struct bvec_iter iter_in; 44003b5c57SKent Overstreet struct bvec_iter iter_out; 45c66029f4SMikulas Patocka sector_t cc_sector; 4640b6229bSMikulas Patocka atomic_t cc_pending; 47610f2de3SMikulas Patocka struct ablkcipher_request *req; 481da177e4SLinus Torvalds }; 491da177e4SLinus Torvalds 5053017030SMilan Broz /* 5153017030SMilan Broz * per bio private data 5253017030SMilan Broz */ 5353017030SMilan Broz struct dm_crypt_io { 5449a8a920SAlasdair G Kergon struct crypt_config *cc; 5553017030SMilan Broz struct bio *base_bio; 5653017030SMilan Broz struct work_struct work; 5753017030SMilan Broz 5853017030SMilan Broz struct convert_context ctx; 5953017030SMilan Broz 6040b6229bSMikulas Patocka atomic_t io_pending; 6153017030SMilan Broz int error; 620c395b0fSMilan Broz sector_t sector; 63dc267621SMikulas Patocka 64b3c5fd30SMikulas Patocka struct rb_node rb_node; 65298a9fa0SMikulas Patocka } CRYPTO_MINALIGN_ATTR; 6653017030SMilan Broz 6701482b76SMilan Broz struct dm_crypt_request { 68b2174eebSHuang Ying struct convert_context *ctx; 6901482b76SMilan Broz struct scatterlist sg_in; 7001482b76SMilan Broz struct scatterlist sg_out; 712dc5327dSMilan Broz sector_t iv_sector; 7201482b76SMilan Broz }; 7301482b76SMilan Broz 741da177e4SLinus Torvalds struct crypt_config; 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds struct crypt_iv_operations { 771da177e4SLinus Torvalds int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 781da177e4SLinus Torvalds const char *opts); 791da177e4SLinus Torvalds void (*dtr)(struct crypt_config *cc); 80b95bf2d3SMilan Broz int (*init)(struct crypt_config *cc); 81542da317SMilan Broz int (*wipe)(struct crypt_config *cc); 822dc5327dSMilan Broz int (*generator)(struct crypt_config *cc, u8 *iv, 832dc5327dSMilan Broz struct dm_crypt_request *dmreq); 842dc5327dSMilan Broz int (*post)(struct crypt_config *cc, u8 *iv, 852dc5327dSMilan Broz struct dm_crypt_request *dmreq); 861da177e4SLinus Torvalds }; 871da177e4SLinus Torvalds 8860473592SMilan Broz struct iv_essiv_private { 89b95bf2d3SMilan Broz struct crypto_hash *hash_tfm; 90b95bf2d3SMilan Broz u8 *salt; 9160473592SMilan Broz }; 9260473592SMilan Broz 9360473592SMilan Broz struct iv_benbi_private { 9460473592SMilan Broz int shift; 9560473592SMilan Broz }; 9660473592SMilan Broz 9734745785SMilan Broz #define LMK_SEED_SIZE 64 /* hash + 0 */ 9834745785SMilan Broz struct iv_lmk_private { 9934745785SMilan Broz struct crypto_shash *hash_tfm; 10034745785SMilan Broz u8 *seed; 10134745785SMilan Broz }; 10234745785SMilan Broz 103ed04d981SMilan Broz #define TCW_WHITENING_SIZE 16 104ed04d981SMilan Broz struct iv_tcw_private { 105ed04d981SMilan Broz struct crypto_shash *crc32_tfm; 106ed04d981SMilan Broz u8 *iv_seed; 107ed04d981SMilan Broz u8 *whitening; 108ed04d981SMilan Broz }; 109ed04d981SMilan Broz 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * Crypt: maps a linear range of a block device 1121da177e4SLinus Torvalds * and encrypts / decrypts at the same time. 1131da177e4SLinus Torvalds */ 1140f5d8e6eSMikulas Patocka enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 1150f5d8e6eSMikulas Patocka DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; 116c0297721SAndi Kleen 117c0297721SAndi Kleen /* 118610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 119c0297721SAndi Kleen */ 1201da177e4SLinus Torvalds struct crypt_config { 1211da177e4SLinus Torvalds struct dm_dev *dev; 1221da177e4SLinus Torvalds sector_t start; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 125ddd42edfSMilan Broz * pool for per bio private data, crypto requests and 126ddd42edfSMilan Broz * encryption requeusts/buffer pages 1271da177e4SLinus Torvalds */ 128ddd42edfSMilan Broz mempool_t *req_pool; 1291da177e4SLinus Torvalds mempool_t *page_pool; 1306a24c718SMilan Broz struct bio_set *bs; 1317145c241SMikulas Patocka struct mutex bio_alloc_lock; 1321da177e4SLinus Torvalds 133cabf08e4SMilan Broz struct workqueue_struct *io_queue; 134cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1353f1e9070SMilan Broz 136dc267621SMikulas Patocka struct task_struct *write_thread; 137dc267621SMikulas Patocka wait_queue_head_t write_thread_wait; 138b3c5fd30SMikulas Patocka struct rb_root write_tree; 139dc267621SMikulas Patocka 1405ebaee6dSMilan Broz char *cipher; 1417dbcd137SMilan Broz char *cipher_string; 1425ebaee6dSMilan Broz 1431da177e4SLinus Torvalds struct crypt_iv_operations *iv_gen_ops; 14479066ad3SHerbert Xu union { 14560473592SMilan Broz struct iv_essiv_private essiv; 14660473592SMilan Broz struct iv_benbi_private benbi; 14734745785SMilan Broz struct iv_lmk_private lmk; 148ed04d981SMilan Broz struct iv_tcw_private tcw; 14979066ad3SHerbert Xu } iv_gen_private; 1501da177e4SLinus Torvalds sector_t iv_offset; 1511da177e4SLinus Torvalds unsigned int iv_size; 1521da177e4SLinus Torvalds 153fd2d231fSMikulas Patocka /* ESSIV: struct crypto_cipher *essiv_tfm */ 154fd2d231fSMikulas Patocka void *iv_private; 155fd2d231fSMikulas Patocka struct crypto_ablkcipher **tfms; 156d1f96423SMilan Broz unsigned tfms_count; 157c0297721SAndi Kleen 158c0297721SAndi Kleen /* 159ddd42edfSMilan Broz * Layout of each crypto request: 160ddd42edfSMilan Broz * 161ddd42edfSMilan Broz * struct ablkcipher_request 162ddd42edfSMilan Broz * context 163ddd42edfSMilan Broz * padding 164ddd42edfSMilan Broz * struct dm_crypt_request 165ddd42edfSMilan Broz * padding 166ddd42edfSMilan Broz * IV 167ddd42edfSMilan Broz * 168ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 169ddd42edfSMilan Broz * correctly aligned. 170ddd42edfSMilan Broz */ 171ddd42edfSMilan Broz unsigned int dmreq_start; 172ddd42edfSMilan Broz 173298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 174298a9fa0SMikulas Patocka 175e48d4bbfSMilan Broz unsigned long flags; 1761da177e4SLinus Torvalds unsigned int key_size; 177da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 178da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 1791da177e4SLinus Torvalds u8 key[0]; 1801da177e4SLinus Torvalds }; 1811da177e4SLinus Torvalds 1826a24c718SMilan Broz #define MIN_IOS 16 1831da177e4SLinus Torvalds 184028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 185395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 1862dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); 187027581f3SOlaf Kirch 188c0297721SAndi Kleen /* 189c0297721SAndi Kleen * Use this to access cipher attributes that are the same for each CPU. 190c0297721SAndi Kleen */ 191c0297721SAndi Kleen static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) 192c0297721SAndi Kleen { 193fd2d231fSMikulas Patocka return cc->tfms[0]; 194c0297721SAndi Kleen } 195c0297721SAndi Kleen 1961da177e4SLinus Torvalds /* 1971da177e4SLinus Torvalds * Different IV generation algorithms: 1981da177e4SLinus Torvalds * 1993c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2003a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2011da177e4SLinus Torvalds * 20261afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 20361afef61SMilan Broz * number, padded with zeros if necessary. 20461afef61SMilan Broz * 2053c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2061da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2071da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2081da177e4SLinus Torvalds * 20948527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 21048527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 21148527fa7SRik Snel * 21246b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 21346b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 21446b47730SLudwig Nussel * 21534745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 21634745785SMilan Broz * by the Loop-AES block device encryption system 21734745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 21834745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 21934745785SMilan Broz * with an IV derived from the sector number, the data and 22034745785SMilan Broz * optionally extra IV seed. 22134745785SMilan Broz * This means that after decryption the first block 22234745785SMilan Broz * of sector must be tweaked according to decrypted data. 22334745785SMilan Broz * Loop-AES can use three encryption schemes: 22434745785SMilan Broz * version 1: is plain aes-cbc mode 22534745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 22634745785SMilan Broz * version 3: the same as version 2 with additional IV seed 22734745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 22834745785SMilan Broz * 229ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 230ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 231e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 232ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 233ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 234ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 235ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 236ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 237ed04d981SMilan Broz * and should be used for old compatible containers access only. 238ed04d981SMilan Broz * 2391da177e4SLinus Torvalds * plumb: unimplemented, see: 2401da177e4SLinus Torvalds * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 2411da177e4SLinus Torvalds */ 2421da177e4SLinus Torvalds 2432dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 2442dc5327dSMilan Broz struct dm_crypt_request *dmreq) 2451da177e4SLinus Torvalds { 2461da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 247283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds return 0; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 25261afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 2532dc5327dSMilan Broz struct dm_crypt_request *dmreq) 25461afef61SMilan Broz { 25561afef61SMilan Broz memset(iv, 0, cc->iv_size); 256283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 25761afef61SMilan Broz 25861afef61SMilan Broz return 0; 25961afef61SMilan Broz } 26061afef61SMilan Broz 261b95bf2d3SMilan Broz /* Initialise ESSIV - compute salt but no local memory allocations */ 262b95bf2d3SMilan Broz static int crypt_iv_essiv_init(struct crypt_config *cc) 263b95bf2d3SMilan Broz { 264b95bf2d3SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 265b95bf2d3SMilan Broz struct hash_desc desc; 266b95bf2d3SMilan Broz struct scatterlist sg; 267c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 268fd2d231fSMikulas Patocka int err; 269b95bf2d3SMilan Broz 270b95bf2d3SMilan Broz sg_init_one(&sg, cc->key, cc->key_size); 271b95bf2d3SMilan Broz desc.tfm = essiv->hash_tfm; 272b95bf2d3SMilan Broz desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; 273b95bf2d3SMilan Broz 274b95bf2d3SMilan Broz err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); 275b95bf2d3SMilan Broz if (err) 276b95bf2d3SMilan Broz return err; 277b95bf2d3SMilan Broz 278fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 279c0297721SAndi Kleen 280c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, essiv->salt, 281b95bf2d3SMilan Broz crypto_hash_digestsize(essiv->hash_tfm)); 282c0297721SAndi Kleen if (err) 283c0297721SAndi Kleen return err; 284c0297721SAndi Kleen 285c0297721SAndi Kleen return 0; 286b95bf2d3SMilan Broz } 287b95bf2d3SMilan Broz 288542da317SMilan Broz /* Wipe salt and reset key derived from volume key */ 289542da317SMilan Broz static int crypt_iv_essiv_wipe(struct crypt_config *cc) 290542da317SMilan Broz { 291542da317SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 292542da317SMilan Broz unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); 293c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 294fd2d231fSMikulas Patocka int r, err = 0; 295542da317SMilan Broz 296542da317SMilan Broz memset(essiv->salt, 0, salt_size); 297542da317SMilan Broz 298fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 299c0297721SAndi Kleen r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); 300c0297721SAndi Kleen if (r) 301c0297721SAndi Kleen err = r; 302c0297721SAndi Kleen 303c0297721SAndi Kleen return err; 304c0297721SAndi Kleen } 305c0297721SAndi Kleen 306c0297721SAndi Kleen /* Set up per cpu cipher state */ 307c0297721SAndi Kleen static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, 308c0297721SAndi Kleen struct dm_target *ti, 309c0297721SAndi Kleen u8 *salt, unsigned saltsize) 310c0297721SAndi Kleen { 311c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 312c0297721SAndi Kleen int err; 313c0297721SAndi Kleen 314c0297721SAndi Kleen /* Setup the essiv_tfm with the given salt */ 315c0297721SAndi Kleen essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); 316c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 317c0297721SAndi Kleen ti->error = "Error allocating crypto tfm for ESSIV"; 318c0297721SAndi Kleen return essiv_tfm; 319c0297721SAndi Kleen } 320c0297721SAndi Kleen 321c0297721SAndi Kleen if (crypto_cipher_blocksize(essiv_tfm) != 322c0297721SAndi Kleen crypto_ablkcipher_ivsize(any_tfm(cc))) { 323c0297721SAndi Kleen ti->error = "Block size of ESSIV cipher does " 324c0297721SAndi Kleen "not match IV size of block cipher"; 325c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 326c0297721SAndi Kleen return ERR_PTR(-EINVAL); 327c0297721SAndi Kleen } 328c0297721SAndi Kleen 329c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); 330c0297721SAndi Kleen if (err) { 331c0297721SAndi Kleen ti->error = "Failed to set key for ESSIV cipher"; 332c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 333c0297721SAndi Kleen return ERR_PTR(err); 334c0297721SAndi Kleen } 335c0297721SAndi Kleen 336c0297721SAndi Kleen return essiv_tfm; 337542da317SMilan Broz } 338542da317SMilan Broz 33960473592SMilan Broz static void crypt_iv_essiv_dtr(struct crypt_config *cc) 34060473592SMilan Broz { 341c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 34260473592SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 34360473592SMilan Broz 344b95bf2d3SMilan Broz crypto_free_hash(essiv->hash_tfm); 345b95bf2d3SMilan Broz essiv->hash_tfm = NULL; 346b95bf2d3SMilan Broz 347b95bf2d3SMilan Broz kzfree(essiv->salt); 348b95bf2d3SMilan Broz essiv->salt = NULL; 349c0297721SAndi Kleen 350fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 351c0297721SAndi Kleen 352c0297721SAndi Kleen if (essiv_tfm) 353c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 354c0297721SAndi Kleen 355fd2d231fSMikulas Patocka cc->iv_private = NULL; 35660473592SMilan Broz } 35760473592SMilan Broz 3581da177e4SLinus Torvalds static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, 3591da177e4SLinus Torvalds const char *opts) 3601da177e4SLinus Torvalds { 3615861f1beSMilan Broz struct crypto_cipher *essiv_tfm = NULL; 3625861f1beSMilan Broz struct crypto_hash *hash_tfm = NULL; 3635861f1beSMilan Broz u8 *salt = NULL; 364fd2d231fSMikulas Patocka int err; 3651da177e4SLinus Torvalds 3665861f1beSMilan Broz if (!opts) { 36772d94861SAlasdair G Kergon ti->error = "Digest algorithm missing for ESSIV mode"; 3681da177e4SLinus Torvalds return -EINVAL; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 371b95bf2d3SMilan Broz /* Allocate hash algorithm */ 37235058687SHerbert Xu hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); 37335058687SHerbert Xu if (IS_ERR(hash_tfm)) { 37472d94861SAlasdair G Kergon ti->error = "Error initializing ESSIV hash"; 3755861f1beSMilan Broz err = PTR_ERR(hash_tfm); 3765861f1beSMilan Broz goto bad; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 379b95bf2d3SMilan Broz salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); 3805861f1beSMilan Broz if (!salt) { 38172d94861SAlasdair G Kergon ti->error = "Error kmallocing salt storage in ESSIV"; 3825861f1beSMilan Broz err = -ENOMEM; 3835861f1beSMilan Broz goto bad; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 386b95bf2d3SMilan Broz cc->iv_gen_private.essiv.salt = salt; 387b95bf2d3SMilan Broz cc->iv_gen_private.essiv.hash_tfm = hash_tfm; 388b95bf2d3SMilan Broz 389c0297721SAndi Kleen essiv_tfm = setup_essiv_cpu(cc, ti, salt, 390c0297721SAndi Kleen crypto_hash_digestsize(hash_tfm)); 391c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 392c0297721SAndi Kleen crypt_iv_essiv_dtr(cc); 393c0297721SAndi Kleen return PTR_ERR(essiv_tfm); 394c0297721SAndi Kleen } 395fd2d231fSMikulas Patocka cc->iv_private = essiv_tfm; 396c0297721SAndi Kleen 3971da177e4SLinus Torvalds return 0; 3985861f1beSMilan Broz 3995861f1beSMilan Broz bad: 4005861f1beSMilan Broz if (hash_tfm && !IS_ERR(hash_tfm)) 4015861f1beSMilan Broz crypto_free_hash(hash_tfm); 402b95bf2d3SMilan Broz kfree(salt); 4035861f1beSMilan Broz return err; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4062dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 4072dc5327dSMilan Broz struct dm_crypt_request *dmreq) 4081da177e4SLinus Torvalds { 409fd2d231fSMikulas Patocka struct crypto_cipher *essiv_tfm = cc->iv_private; 410c0297721SAndi Kleen 4111da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 412283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 413c0297721SAndi Kleen crypto_cipher_encrypt_one(essiv_tfm, iv, iv); 414c0297721SAndi Kleen 4151da177e4SLinus Torvalds return 0; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 41848527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 41948527fa7SRik Snel const char *opts) 42048527fa7SRik Snel { 421c0297721SAndi Kleen unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); 422f0d1b0b3SDavid Howells int log = ilog2(bs); 42348527fa7SRik Snel 42448527fa7SRik Snel /* we need to calculate how far we must shift the sector count 42548527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 42648527fa7SRik Snel 42748527fa7SRik Snel if (1 << log != bs) { 42848527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 42948527fa7SRik Snel return -EINVAL; 43048527fa7SRik Snel } 43148527fa7SRik Snel 43248527fa7SRik Snel if (log > 9) { 43348527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 43448527fa7SRik Snel return -EINVAL; 43548527fa7SRik Snel } 43648527fa7SRik Snel 43760473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 43848527fa7SRik Snel 43948527fa7SRik Snel return 0; 44048527fa7SRik Snel } 44148527fa7SRik Snel 44248527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 44348527fa7SRik Snel { 44448527fa7SRik Snel } 44548527fa7SRik Snel 4462dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 4472dc5327dSMilan Broz struct dm_crypt_request *dmreq) 44848527fa7SRik Snel { 44979066ad3SHerbert Xu __be64 val; 45079066ad3SHerbert Xu 45148527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 45279066ad3SHerbert Xu 4532dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 45479066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 45548527fa7SRik Snel 4561da177e4SLinus Torvalds return 0; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4592dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 4602dc5327dSMilan Broz struct dm_crypt_request *dmreq) 46146b47730SLudwig Nussel { 46246b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 46346b47730SLudwig Nussel 46446b47730SLudwig Nussel return 0; 46546b47730SLudwig Nussel } 46646b47730SLudwig Nussel 46734745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 46834745785SMilan Broz { 46934745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 47034745785SMilan Broz 47134745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 47234745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 47334745785SMilan Broz lmk->hash_tfm = NULL; 47434745785SMilan Broz 47534745785SMilan Broz kzfree(lmk->seed); 47634745785SMilan Broz lmk->seed = NULL; 47734745785SMilan Broz } 47834745785SMilan Broz 47934745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 48034745785SMilan Broz const char *opts) 48134745785SMilan Broz { 48234745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 48334745785SMilan Broz 48434745785SMilan Broz lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); 48534745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 48634745785SMilan Broz ti->error = "Error initializing LMK hash"; 48734745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 48834745785SMilan Broz } 48934745785SMilan Broz 49034745785SMilan Broz /* No seed in LMK version 2 */ 49134745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 49234745785SMilan Broz lmk->seed = NULL; 49334745785SMilan Broz return 0; 49434745785SMilan Broz } 49534745785SMilan Broz 49634745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 49734745785SMilan Broz if (!lmk->seed) { 49834745785SMilan Broz crypt_iv_lmk_dtr(cc); 49934745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 50034745785SMilan Broz return -ENOMEM; 50134745785SMilan Broz } 50234745785SMilan Broz 50334745785SMilan Broz return 0; 50434745785SMilan Broz } 50534745785SMilan Broz 50634745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 50734745785SMilan Broz { 50834745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 50934745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 51034745785SMilan Broz 51134745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 51234745785SMilan Broz if (lmk->seed) 51334745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 51434745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 51534745785SMilan Broz 51634745785SMilan Broz return 0; 51734745785SMilan Broz } 51834745785SMilan Broz 51934745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 52034745785SMilan Broz { 52134745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 52234745785SMilan Broz 52334745785SMilan Broz if (lmk->seed) 52434745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 52534745785SMilan Broz 52634745785SMilan Broz return 0; 52734745785SMilan Broz } 52834745785SMilan Broz 52934745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 53034745785SMilan Broz struct dm_crypt_request *dmreq, 53134745785SMilan Broz u8 *data) 53234745785SMilan Broz { 53334745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 534b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 53534745785SMilan Broz struct md5_state md5state; 536da31a078SMilan Broz __le32 buf[4]; 53734745785SMilan Broz int i, r; 53834745785SMilan Broz 539b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 540b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 54134745785SMilan Broz 542b6106265SJan-Simon Möller r = crypto_shash_init(desc); 54334745785SMilan Broz if (r) 54434745785SMilan Broz return r; 54534745785SMilan Broz 54634745785SMilan Broz if (lmk->seed) { 547b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 54834745785SMilan Broz if (r) 54934745785SMilan Broz return r; 55034745785SMilan Broz } 55134745785SMilan Broz 55234745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 553b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 55434745785SMilan Broz if (r) 55534745785SMilan Broz return r; 55634745785SMilan Broz 55734745785SMilan Broz /* Sector is cropped to 56 bits here */ 55834745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 55934745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 56034745785SMilan Broz buf[2] = cpu_to_le32(4024); 56134745785SMilan Broz buf[3] = 0; 562b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 56334745785SMilan Broz if (r) 56434745785SMilan Broz return r; 56534745785SMilan Broz 56634745785SMilan Broz /* No MD5 padding here */ 567b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 56834745785SMilan Broz if (r) 56934745785SMilan Broz return r; 57034745785SMilan Broz 57134745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 57234745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 57334745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 57434745785SMilan Broz 57534745785SMilan Broz return 0; 57634745785SMilan Broz } 57734745785SMilan Broz 57834745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 57934745785SMilan Broz struct dm_crypt_request *dmreq) 58034745785SMilan Broz { 58134745785SMilan Broz u8 *src; 58234745785SMilan Broz int r = 0; 58334745785SMilan Broz 58434745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 585c2e022cbSCong Wang src = kmap_atomic(sg_page(&dmreq->sg_in)); 58634745785SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); 587c2e022cbSCong Wang kunmap_atomic(src); 58834745785SMilan Broz } else 58934745785SMilan Broz memset(iv, 0, cc->iv_size); 59034745785SMilan Broz 59134745785SMilan Broz return r; 59234745785SMilan Broz } 59334745785SMilan Broz 59434745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 59534745785SMilan Broz struct dm_crypt_request *dmreq) 59634745785SMilan Broz { 59734745785SMilan Broz u8 *dst; 59834745785SMilan Broz int r; 59934745785SMilan Broz 60034745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 60134745785SMilan Broz return 0; 60234745785SMilan Broz 603c2e022cbSCong Wang dst = kmap_atomic(sg_page(&dmreq->sg_out)); 60434745785SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); 60534745785SMilan Broz 60634745785SMilan Broz /* Tweak the first block of plaintext sector */ 60734745785SMilan Broz if (!r) 60834745785SMilan Broz crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); 60934745785SMilan Broz 610c2e022cbSCong Wang kunmap_atomic(dst); 61134745785SMilan Broz return r; 61234745785SMilan Broz } 61334745785SMilan Broz 614ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 615ed04d981SMilan Broz { 616ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 617ed04d981SMilan Broz 618ed04d981SMilan Broz kzfree(tcw->iv_seed); 619ed04d981SMilan Broz tcw->iv_seed = NULL; 620ed04d981SMilan Broz kzfree(tcw->whitening); 621ed04d981SMilan Broz tcw->whitening = NULL; 622ed04d981SMilan Broz 623ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 624ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 625ed04d981SMilan Broz tcw->crc32_tfm = NULL; 626ed04d981SMilan Broz } 627ed04d981SMilan Broz 628ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 629ed04d981SMilan Broz const char *opts) 630ed04d981SMilan Broz { 631ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 632ed04d981SMilan Broz 633ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 634ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 635ed04d981SMilan Broz return -EINVAL; 636ed04d981SMilan Broz } 637ed04d981SMilan Broz 638ed04d981SMilan Broz tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); 639ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 640ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 641ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 642ed04d981SMilan Broz } 643ed04d981SMilan Broz 644ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 645ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 646ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 647ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 648ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 649ed04d981SMilan Broz return -ENOMEM; 650ed04d981SMilan Broz } 651ed04d981SMilan Broz 652ed04d981SMilan Broz return 0; 653ed04d981SMilan Broz } 654ed04d981SMilan Broz 655ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 656ed04d981SMilan Broz { 657ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 658ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 659ed04d981SMilan Broz 660ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 661ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 662ed04d981SMilan Broz TCW_WHITENING_SIZE); 663ed04d981SMilan Broz 664ed04d981SMilan Broz return 0; 665ed04d981SMilan Broz } 666ed04d981SMilan Broz 667ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 668ed04d981SMilan Broz { 669ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 670ed04d981SMilan Broz 671ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 672ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 673ed04d981SMilan Broz 674ed04d981SMilan Broz return 0; 675ed04d981SMilan Broz } 676ed04d981SMilan Broz 677ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 678ed04d981SMilan Broz struct dm_crypt_request *dmreq, 679ed04d981SMilan Broz u8 *data) 680ed04d981SMilan Broz { 681ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 682ed04d981SMilan Broz u64 sector = cpu_to_le64((u64)dmreq->iv_sector); 683ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 684b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 685ed04d981SMilan Broz int i, r; 686ed04d981SMilan Broz 687ed04d981SMilan Broz /* xor whitening with sector number */ 688ed04d981SMilan Broz memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); 689ed04d981SMilan Broz crypto_xor(buf, (u8 *)§or, 8); 690ed04d981SMilan Broz crypto_xor(&buf[8], (u8 *)§or, 8); 691ed04d981SMilan Broz 692ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 693b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 694b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 695ed04d981SMilan Broz for (i = 0; i < 4; i++) { 696b6106265SJan-Simon Möller r = crypto_shash_init(desc); 697ed04d981SMilan Broz if (r) 698ed04d981SMilan Broz goto out; 699b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 700ed04d981SMilan Broz if (r) 701ed04d981SMilan Broz goto out; 702b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 703ed04d981SMilan Broz if (r) 704ed04d981SMilan Broz goto out; 705ed04d981SMilan Broz } 706ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 707ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 708ed04d981SMilan Broz 709ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 710ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 711ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 712ed04d981SMilan Broz out: 7131a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 714ed04d981SMilan Broz return r; 715ed04d981SMilan Broz } 716ed04d981SMilan Broz 717ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 718ed04d981SMilan Broz struct dm_crypt_request *dmreq) 719ed04d981SMilan Broz { 720ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 721ed04d981SMilan Broz u64 sector = cpu_to_le64((u64)dmreq->iv_sector); 722ed04d981SMilan Broz u8 *src; 723ed04d981SMilan Broz int r = 0; 724ed04d981SMilan Broz 725ed04d981SMilan Broz /* Remove whitening from ciphertext */ 726ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 727ed04d981SMilan Broz src = kmap_atomic(sg_page(&dmreq->sg_in)); 728ed04d981SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); 729ed04d981SMilan Broz kunmap_atomic(src); 730ed04d981SMilan Broz } 731ed04d981SMilan Broz 732ed04d981SMilan Broz /* Calculate IV */ 733ed04d981SMilan Broz memcpy(iv, tcw->iv_seed, cc->iv_size); 734ed04d981SMilan Broz crypto_xor(iv, (u8 *)§or, 8); 735ed04d981SMilan Broz if (cc->iv_size > 8) 736ed04d981SMilan Broz crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); 737ed04d981SMilan Broz 738ed04d981SMilan Broz return r; 739ed04d981SMilan Broz } 740ed04d981SMilan Broz 741ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 742ed04d981SMilan Broz struct dm_crypt_request *dmreq) 743ed04d981SMilan Broz { 744ed04d981SMilan Broz u8 *dst; 745ed04d981SMilan Broz int r; 746ed04d981SMilan Broz 747ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 748ed04d981SMilan Broz return 0; 749ed04d981SMilan Broz 750ed04d981SMilan Broz /* Apply whitening on ciphertext */ 751ed04d981SMilan Broz dst = kmap_atomic(sg_page(&dmreq->sg_out)); 752ed04d981SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); 753ed04d981SMilan Broz kunmap_atomic(dst); 754ed04d981SMilan Broz 755ed04d981SMilan Broz return r; 756ed04d981SMilan Broz } 757ed04d981SMilan Broz 7581da177e4SLinus Torvalds static struct crypt_iv_operations crypt_iv_plain_ops = { 7591da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 7601da177e4SLinus Torvalds }; 7611da177e4SLinus Torvalds 76261afef61SMilan Broz static struct crypt_iv_operations crypt_iv_plain64_ops = { 76361afef61SMilan Broz .generator = crypt_iv_plain64_gen 76461afef61SMilan Broz }; 76561afef61SMilan Broz 7661da177e4SLinus Torvalds static struct crypt_iv_operations crypt_iv_essiv_ops = { 7671da177e4SLinus Torvalds .ctr = crypt_iv_essiv_ctr, 7681da177e4SLinus Torvalds .dtr = crypt_iv_essiv_dtr, 769b95bf2d3SMilan Broz .init = crypt_iv_essiv_init, 770542da317SMilan Broz .wipe = crypt_iv_essiv_wipe, 7711da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 7721da177e4SLinus Torvalds }; 7731da177e4SLinus Torvalds 77448527fa7SRik Snel static struct crypt_iv_operations crypt_iv_benbi_ops = { 77548527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 77648527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 77748527fa7SRik Snel .generator = crypt_iv_benbi_gen 77848527fa7SRik Snel }; 7791da177e4SLinus Torvalds 78046b47730SLudwig Nussel static struct crypt_iv_operations crypt_iv_null_ops = { 78146b47730SLudwig Nussel .generator = crypt_iv_null_gen 78246b47730SLudwig Nussel }; 78346b47730SLudwig Nussel 78434745785SMilan Broz static struct crypt_iv_operations crypt_iv_lmk_ops = { 78534745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 78634745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 78734745785SMilan Broz .init = crypt_iv_lmk_init, 78834745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 78934745785SMilan Broz .generator = crypt_iv_lmk_gen, 79034745785SMilan Broz .post = crypt_iv_lmk_post 79134745785SMilan Broz }; 79234745785SMilan Broz 793ed04d981SMilan Broz static struct crypt_iv_operations crypt_iv_tcw_ops = { 794ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 795ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 796ed04d981SMilan Broz .init = crypt_iv_tcw_init, 797ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 798ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 799ed04d981SMilan Broz .post = crypt_iv_tcw_post 800ed04d981SMilan Broz }; 801ed04d981SMilan Broz 802d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 803d469f841SMilan Broz struct convert_context *ctx, 8041da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 805fcd369daSMilan Broz sector_t sector) 8061da177e4SLinus Torvalds { 8071da177e4SLinus Torvalds ctx->bio_in = bio_in; 8081da177e4SLinus Torvalds ctx->bio_out = bio_out; 809003b5c57SKent Overstreet if (bio_in) 810003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 811003b5c57SKent Overstreet if (bio_out) 812003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 813c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 81443d69034SMilan Broz init_completion(&ctx->restart); 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 817b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 818b2174eebSHuang Ying struct ablkcipher_request *req) 819b2174eebSHuang Ying { 820b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 821b2174eebSHuang Ying } 822b2174eebSHuang Ying 823b2174eebSHuang Ying static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, 824b2174eebSHuang Ying struct dm_crypt_request *dmreq) 825b2174eebSHuang Ying { 826b2174eebSHuang Ying return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); 827b2174eebSHuang Ying } 828b2174eebSHuang Ying 8292dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 8302dc5327dSMilan Broz struct dm_crypt_request *dmreq) 8312dc5327dSMilan Broz { 8322dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 8332dc5327dSMilan Broz crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); 8342dc5327dSMilan Broz } 8352dc5327dSMilan Broz 83601482b76SMilan Broz static int crypt_convert_block(struct crypt_config *cc, 8373a7f6c99SMilan Broz struct convert_context *ctx, 8383a7f6c99SMilan Broz struct ablkcipher_request *req) 83901482b76SMilan Broz { 840003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 841003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 8423a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 8433a7f6c99SMilan Broz u8 *iv; 84440b6229bSMikulas Patocka int r; 84501482b76SMilan Broz 846b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 8472dc5327dSMilan Broz iv = iv_of_dmreq(cc, dmreq); 8483a7f6c99SMilan Broz 849c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 850b2174eebSHuang Ying dmreq->ctx = ctx; 8513a7f6c99SMilan Broz sg_init_table(&dmreq->sg_in, 1); 852003b5c57SKent Overstreet sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, 853003b5c57SKent Overstreet bv_in.bv_offset); 85401482b76SMilan Broz 8553a7f6c99SMilan Broz sg_init_table(&dmreq->sg_out, 1); 856003b5c57SKent Overstreet sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, 857003b5c57SKent Overstreet bv_out.bv_offset); 85801482b76SMilan Broz 859003b5c57SKent Overstreet bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); 860003b5c57SKent Overstreet bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); 86101482b76SMilan Broz 8623a7f6c99SMilan Broz if (cc->iv_gen_ops) { 8632dc5327dSMilan Broz r = cc->iv_gen_ops->generator(cc, iv, dmreq); 8643a7f6c99SMilan Broz if (r < 0) 8653a7f6c99SMilan Broz return r; 8663a7f6c99SMilan Broz } 8673a7f6c99SMilan Broz 8683a7f6c99SMilan Broz ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, 8693a7f6c99SMilan Broz 1 << SECTOR_SHIFT, iv); 8703a7f6c99SMilan Broz 8713a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 8723a7f6c99SMilan Broz r = crypto_ablkcipher_encrypt(req); 8733a7f6c99SMilan Broz else 8743a7f6c99SMilan Broz r = crypto_ablkcipher_decrypt(req); 8753a7f6c99SMilan Broz 8762dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 8772dc5327dSMilan Broz r = cc->iv_gen_ops->post(cc, iv, dmreq); 8782dc5327dSMilan Broz 8793a7f6c99SMilan Broz return r; 88001482b76SMilan Broz } 88101482b76SMilan Broz 88295497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 88395497a96SMilan Broz int error); 884c0297721SAndi Kleen 885ddd42edfSMilan Broz static void crypt_alloc_req(struct crypt_config *cc, 886ddd42edfSMilan Broz struct convert_context *ctx) 887ddd42edfSMilan Broz { 888c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 889c0297721SAndi Kleen 890610f2de3SMikulas Patocka if (!ctx->req) 891610f2de3SMikulas Patocka ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); 892c0297721SAndi Kleen 893610f2de3SMikulas Patocka ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); 894610f2de3SMikulas Patocka ablkcipher_request_set_callback(ctx->req, 895c0297721SAndi Kleen CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 896610f2de3SMikulas Patocka kcryptd_async_done, dmreq_of_req(cc, ctx->req)); 897ddd42edfSMilan Broz } 898ddd42edfSMilan Broz 899298a9fa0SMikulas Patocka static void crypt_free_req(struct crypt_config *cc, 900298a9fa0SMikulas Patocka struct ablkcipher_request *req, struct bio *base_bio) 901298a9fa0SMikulas Patocka { 902298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 903298a9fa0SMikulas Patocka 904298a9fa0SMikulas Patocka if ((struct ablkcipher_request *)(io + 1) != req) 905298a9fa0SMikulas Patocka mempool_free(req, cc->req_pool); 906298a9fa0SMikulas Patocka } 907298a9fa0SMikulas Patocka 9081da177e4SLinus Torvalds /* 9091da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 9101da177e4SLinus Torvalds */ 9111da177e4SLinus Torvalds static int crypt_convert(struct crypt_config *cc, 9121da177e4SLinus Torvalds struct convert_context *ctx) 9131da177e4SLinus Torvalds { 9143f1e9070SMilan Broz int r; 9151da177e4SLinus Torvalds 91640b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 917c8081618SMilan Broz 918003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 9191da177e4SLinus Torvalds 9203a7f6c99SMilan Broz crypt_alloc_req(cc, ctx); 9213a7f6c99SMilan Broz 92240b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 9233f1e9070SMilan Broz 924610f2de3SMikulas Patocka r = crypt_convert_block(cc, ctx, ctx->req); 9253a7f6c99SMilan Broz 9263a7f6c99SMilan Broz switch (r) { 9273f1e9070SMilan Broz /* async */ 9283a7f6c99SMilan Broz case -EBUSY: 9293a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 93016735d02SWolfram Sang reinit_completion(&ctx->restart); 9313a7f6c99SMilan Broz /* fall through*/ 9323a7f6c99SMilan Broz case -EINPROGRESS: 933610f2de3SMikulas Patocka ctx->req = NULL; 934c66029f4SMikulas Patocka ctx->cc_sector++; 9353a7f6c99SMilan Broz continue; 9363a7f6c99SMilan Broz 9373f1e9070SMilan Broz /* sync */ 9383f1e9070SMilan Broz case 0: 93940b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 940c66029f4SMikulas Patocka ctx->cc_sector++; 941c7f1b204SMilan Broz cond_resched(); 9423f1e9070SMilan Broz continue; 9431da177e4SLinus Torvalds 9443f1e9070SMilan Broz /* error */ 9453f1e9070SMilan Broz default: 94640b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 9471da177e4SLinus Torvalds return r; 9481da177e4SLinus Torvalds } 9493f1e9070SMilan Broz } 9503f1e9070SMilan Broz 9513f1e9070SMilan Broz return 0; 9523f1e9070SMilan Broz } 9531da177e4SLinus Torvalds 954cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 955cf2f1abfSMikulas Patocka 9561da177e4SLinus Torvalds /* 9571da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 9581da177e4SLinus Torvalds * This should never violate the device limitations 9597145c241SMikulas Patocka * 9607145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 9617145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 9627145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 9637145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 9647145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 9657145c241SMikulas Patocka * 9667145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 9677145c241SMikulas Patocka * 9687145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 9697145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 9707145c241SMikulas Patocka * to blocking allocations with a mutex. 9711da177e4SLinus Torvalds */ 972cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 9731da177e4SLinus Torvalds { 97449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 9758b004457SMilan Broz struct bio *clone; 9761da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 9777145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 9787145c241SMikulas Patocka unsigned i, len, remaining_size; 97991e10625SMilan Broz struct page *page; 980cf2f1abfSMikulas Patocka struct bio_vec *bvec; 9811da177e4SLinus Torvalds 9827145c241SMikulas Patocka retry: 9837145c241SMikulas Patocka if (unlikely(gfp_mask & __GFP_WAIT)) 9847145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 9857145c241SMikulas Patocka 9866a24c718SMilan Broz clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); 9878b004457SMilan Broz if (!clone) 9887145c241SMikulas Patocka goto return_clone; 9891da177e4SLinus Torvalds 990027581f3SOlaf Kirch clone_init(io, clone); 9916a24c718SMilan Broz 9927145c241SMikulas Patocka remaining_size = size; 9937145c241SMikulas Patocka 994f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 99591e10625SMilan Broz page = mempool_alloc(cc->page_pool, gfp_mask); 9967145c241SMikulas Patocka if (!page) { 9977145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 9987145c241SMikulas Patocka bio_put(clone); 9997145c241SMikulas Patocka gfp_mask |= __GFP_WAIT; 10007145c241SMikulas Patocka goto retry; 10017145c241SMikulas Patocka } 10021da177e4SLinus Torvalds 10037145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 10041da177e4SLinus Torvalds 1005cf2f1abfSMikulas Patocka bvec = &clone->bi_io_vec[clone->bi_vcnt++]; 1006cf2f1abfSMikulas Patocka bvec->bv_page = page; 1007cf2f1abfSMikulas Patocka bvec->bv_len = len; 1008cf2f1abfSMikulas Patocka bvec->bv_offset = 0; 1009cf2f1abfSMikulas Patocka 1010cf2f1abfSMikulas Patocka clone->bi_iter.bi_size += len; 101191e10625SMilan Broz 10127145c241SMikulas Patocka remaining_size -= len; 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 10157145c241SMikulas Patocka return_clone: 10167145c241SMikulas Patocka if (unlikely(gfp_mask & __GFP_WAIT)) 10177145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 10187145c241SMikulas Patocka 10198b004457SMilan Broz return clone; 10201da177e4SLinus Torvalds } 10211da177e4SLinus Torvalds 1022644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 10231da177e4SLinus Torvalds { 1024644bd2f0SNeil Brown unsigned int i; 10251da177e4SLinus Torvalds struct bio_vec *bv; 10261da177e4SLinus Torvalds 1027cb34e057SKent Overstreet bio_for_each_segment_all(bv, clone, i) { 10281da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 10291da177e4SLinus Torvalds mempool_free(bv->bv_page, cc->page_pool); 10301da177e4SLinus Torvalds bv->bv_page = NULL; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds 1034298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1035dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1036dc440d1eSMilan Broz { 103749a8a920SAlasdair G Kergon io->cc = cc; 1038dc440d1eSMilan Broz io->base_bio = bio; 1039dc440d1eSMilan Broz io->sector = sector; 1040dc440d1eSMilan Broz io->error = 0; 1041610f2de3SMikulas Patocka io->ctx.req = NULL; 104240b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1043dc440d1eSMilan Broz } 1044dc440d1eSMilan Broz 10453e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 10463e1a8bddSMilan Broz { 104740b6229bSMikulas Patocka atomic_inc(&io->io_pending); 10483e1a8bddSMilan Broz } 10493e1a8bddSMilan Broz 10501da177e4SLinus Torvalds /* 10511da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 10521da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 10531da177e4SLinus Torvalds */ 10545742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 10551da177e4SLinus Torvalds { 105649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1057b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 1058b35f8caaSMilan Broz int error = io->error; 10591da177e4SLinus Torvalds 106040b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 10611da177e4SLinus Torvalds return; 10621da177e4SLinus Torvalds 1063610f2de3SMikulas Patocka if (io->ctx.req) 1064298a9fa0SMikulas Patocka crypt_free_req(cc, io->ctx.req, base_bio); 1065b35f8caaSMilan Broz 1066b35f8caaSMilan Broz bio_endio(base_bio, error); 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds /* 1070cabf08e4SMilan Broz * kcryptd/kcryptd_io: 10711da177e4SLinus Torvalds * 10721da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 107323541d2dSMilan Broz * interrupt context. 1074cabf08e4SMilan Broz * 1075cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1076cabf08e4SMilan Broz * 1077cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1078cabf08e4SMilan Broz * 1079cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1080cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1081cabf08e4SMilan Broz * to memory allocation. 1082c0297721SAndi Kleen * 1083c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1084c0297721SAndi Kleen * They should not depend on each other and do not block. 10851da177e4SLinus Torvalds */ 10866712ecf8SNeilBrown static void crypt_endio(struct bio *clone, int error) 10878b004457SMilan Broz { 1088028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 108949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1090ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 10918b004457SMilan Broz 1092adfe4770SMilan Broz if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) 1093adfe4770SMilan Broz error = -EIO; 1094adfe4770SMilan Broz 10958b004457SMilan Broz /* 10966712ecf8SNeilBrown * free the processed pages 10978b004457SMilan Broz */ 1098ee7a491eSMilan Broz if (rw == WRITE) 1099644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 11008b004457SMilan Broz 11018b004457SMilan Broz bio_put(clone); 1102ee7a491eSMilan Broz 1103ee7a491eSMilan Broz if (rw == READ && !error) { 1104cabf08e4SMilan Broz kcryptd_queue_crypt(io); 11056712ecf8SNeilBrown return; 1106ee7a491eSMilan Broz } 11075742fd77SMilan Broz 11085742fd77SMilan Broz if (unlikely(error)) 11095742fd77SMilan Broz io->error = error; 11105742fd77SMilan Broz 11115742fd77SMilan Broz crypt_dec_pending(io); 11128b004457SMilan Broz } 11138b004457SMilan Broz 1114028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 11158b004457SMilan Broz { 111649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 11178b004457SMilan Broz 11188b004457SMilan Broz clone->bi_private = io; 11198b004457SMilan Broz clone->bi_end_io = crypt_endio; 11208b004457SMilan Broz clone->bi_bdev = cc->dev->bdev; 11218b004457SMilan Broz clone->bi_rw = io->base_bio->bi_rw; 11228b004457SMilan Broz } 11238b004457SMilan Broz 112420c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 11258b004457SMilan Broz { 112649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 11278b004457SMilan Broz struct bio *base_bio = io->base_bio; 11288b004457SMilan Broz struct bio *clone; 112993e605c2SMilan Broz 11308b004457SMilan Broz /* 11318b004457SMilan Broz * The block layer might modify the bvec array, so always 11328b004457SMilan Broz * copy the required bvecs because we need the original 11338b004457SMilan Broz * one in order to decrypt the whole bio data *afterwards*. 11348b004457SMilan Broz */ 1135bf800ef1SKent Overstreet clone = bio_clone_bioset(base_bio, gfp, cc->bs); 11367eaceaccSJens Axboe if (!clone) 113720c82538SMilan Broz return 1; 11388b004457SMilan Broz 113920c82538SMilan Broz crypt_inc_pending(io); 114020c82538SMilan Broz 11418b004457SMilan Broz clone_init(io, clone); 11424f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 11438b004457SMilan Broz 114493e605c2SMilan Broz generic_make_request(clone); 114520c82538SMilan Broz return 0; 11468b004457SMilan Broz } 11478b004457SMilan Broz 1148dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1149395b167cSAlasdair G Kergon { 1150395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1151395b167cSAlasdair G Kergon 115220c82538SMilan Broz crypt_inc_pending(io); 115320c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 115420c82538SMilan Broz io->error = -ENOMEM; 115520c82538SMilan Broz crypt_dec_pending(io); 1156395b167cSAlasdair G Kergon } 1157395b167cSAlasdair G Kergon 1158dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1159395b167cSAlasdair G Kergon { 116049a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1161395b167cSAlasdair G Kergon 1162dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1163395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1164395b167cSAlasdair G Kergon } 1165395b167cSAlasdair G Kergon 1166dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1167dc267621SMikulas Patocka { 1168dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1169dc267621SMikulas Patocka 1170dc267621SMikulas Patocka generic_make_request(clone); 1171dc267621SMikulas Patocka } 1172dc267621SMikulas Patocka 1173b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1174b3c5fd30SMikulas Patocka 1175dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1176dc267621SMikulas Patocka { 1177dc267621SMikulas Patocka struct crypt_config *cc = data; 1178b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1179b3c5fd30SMikulas Patocka 1180dc267621SMikulas Patocka while (1) { 1181b3c5fd30SMikulas Patocka struct rb_root write_tree; 1182dc267621SMikulas Patocka struct blk_plug plug; 1183dc267621SMikulas Patocka 1184dc267621SMikulas Patocka DECLARE_WAITQUEUE(wait, current); 1185dc267621SMikulas Patocka 1186dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1187dc267621SMikulas Patocka continue_locked: 1188dc267621SMikulas Patocka 1189b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1190dc267621SMikulas Patocka goto pop_from_list; 1191dc267621SMikulas Patocka 1192dc267621SMikulas Patocka __set_current_state(TASK_INTERRUPTIBLE); 1193dc267621SMikulas Patocka __add_wait_queue(&cc->write_thread_wait, &wait); 1194dc267621SMikulas Patocka 1195dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1196dc267621SMikulas Patocka 1197dc267621SMikulas Patocka if (unlikely(kthread_should_stop())) { 1198dc267621SMikulas Patocka set_task_state(current, TASK_RUNNING); 1199dc267621SMikulas Patocka remove_wait_queue(&cc->write_thread_wait, &wait); 1200dc267621SMikulas Patocka break; 1201dc267621SMikulas Patocka } 1202dc267621SMikulas Patocka 1203dc267621SMikulas Patocka schedule(); 1204dc267621SMikulas Patocka 1205dc267621SMikulas Patocka set_task_state(current, TASK_RUNNING); 1206dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1207dc267621SMikulas Patocka __remove_wait_queue(&cc->write_thread_wait, &wait); 1208dc267621SMikulas Patocka goto continue_locked; 1209dc267621SMikulas Patocka 1210dc267621SMikulas Patocka pop_from_list: 1211b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1212b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1213dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1214dc267621SMikulas Patocka 1215b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1216b3c5fd30SMikulas Patocka 1217b3c5fd30SMikulas Patocka /* 1218b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1219b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1220b3c5fd30SMikulas Patocka */ 1221dc267621SMikulas Patocka blk_start_plug(&plug); 1222dc267621SMikulas Patocka do { 1223b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1224b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1225dc267621SMikulas Patocka kcryptd_io_write(io); 1226b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1227dc267621SMikulas Patocka blk_finish_plug(&plug); 1228dc267621SMikulas Patocka } 1229dc267621SMikulas Patocka return 0; 1230dc267621SMikulas Patocka } 1231dc267621SMikulas Patocka 123272c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 12334e4eef64SMilan Broz { 1234dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 123549a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1236dc267621SMikulas Patocka unsigned long flags; 1237b3c5fd30SMikulas Patocka sector_t sector; 1238b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1239dec1cedfSMilan Broz 124072c6e7afSMikulas Patocka if (unlikely(io->error < 0)) { 1241dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1242dec1cedfSMilan Broz bio_put(clone); 12436c031f41SMilan Broz crypt_dec_pending(io); 1244dec1cedfSMilan Broz return; 1245dec1cedfSMilan Broz } 1246dec1cedfSMilan Broz 1247dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1248003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1249dec1cedfSMilan Broz 12504f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1251899c95d3SMilan Broz 12520f5d8e6eSMikulas Patocka if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { 12530f5d8e6eSMikulas Patocka generic_make_request(clone); 12540f5d8e6eSMikulas Patocka return; 12550f5d8e6eSMikulas Patocka } 12560f5d8e6eSMikulas Patocka 1257dc267621SMikulas Patocka spin_lock_irqsave(&cc->write_thread_wait.lock, flags); 1258b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1259b3c5fd30SMikulas Patocka parent = NULL; 1260b3c5fd30SMikulas Patocka sector = io->sector; 1261b3c5fd30SMikulas Patocka while (*rbp) { 1262b3c5fd30SMikulas Patocka parent = *rbp; 1263b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1264b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1265b3c5fd30SMikulas Patocka else 1266b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1267b3c5fd30SMikulas Patocka } 1268b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1269b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1270b3c5fd30SMikulas Patocka 1271dc267621SMikulas Patocka wake_up_locked(&cc->write_thread_wait); 1272dc267621SMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); 12734e4eef64SMilan Broz } 12744e4eef64SMilan Broz 1275fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 12768b004457SMilan Broz { 127749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 12788b004457SMilan Broz struct bio *clone; 1279c8081618SMilan Broz int crypt_finished; 1280b635b00eSMilan Broz sector_t sector = io->sector; 1281dec1cedfSMilan Broz int r; 12828b004457SMilan Broz 128393e605c2SMilan Broz /* 1284fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 1285fc5a5e9aSMilan Broz */ 1286fc5a5e9aSMilan Broz crypt_inc_pending(io); 1287b635b00eSMilan Broz crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); 1288fc5a5e9aSMilan Broz 1289cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 129023541d2dSMilan Broz if (unlikely(!clone)) { 1291cf2f1abfSMikulas Patocka io->error = -EIO; 1292cf2f1abfSMikulas Patocka goto dec; 129323541d2dSMilan Broz } 12948b004457SMilan Broz 129553017030SMilan Broz io->ctx.bio_out = clone; 1296003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 12978b004457SMilan Broz 1298b635b00eSMilan Broz sector += bio_sectors(clone); 1299dec1cedfSMilan Broz 13004e594098SMilan Broz crypt_inc_pending(io); 1301dec1cedfSMilan Broz r = crypt_convert(cc, &io->ctx); 1302cf2f1abfSMikulas Patocka if (r) 130372c6e7afSMikulas Patocka io->error = -EIO; 130440b6229bSMikulas Patocka crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); 1305dec1cedfSMilan Broz 1306c8081618SMilan Broz /* Encryption was already finished, submit io now */ 1307c8081618SMilan Broz if (crypt_finished) { 130872c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 1309b635b00eSMilan Broz io->sector = sector; 13104e594098SMilan Broz } 131193e605c2SMilan Broz 1312cf2f1abfSMikulas Patocka dec: 1313899c95d3SMilan Broz crypt_dec_pending(io); 131484131db6SMilan Broz } 131584131db6SMilan Broz 131672c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 13175742fd77SMilan Broz { 13185742fd77SMilan Broz crypt_dec_pending(io); 13195742fd77SMilan Broz } 13205742fd77SMilan Broz 13214e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 13228b004457SMilan Broz { 132349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 13245742fd77SMilan Broz int r = 0; 13258b004457SMilan Broz 13263e1a8bddSMilan Broz crypt_inc_pending(io); 13273a7f6c99SMilan Broz 132853017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 13290c395b0fSMilan Broz io->sector); 13308b004457SMilan Broz 13315742fd77SMilan Broz r = crypt_convert(cc, &io->ctx); 133272c6e7afSMikulas Patocka if (r < 0) 133372c6e7afSMikulas Patocka io->error = -EIO; 13345742fd77SMilan Broz 133540b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 133672c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 13373a7f6c99SMilan Broz 13383a7f6c99SMilan Broz crypt_dec_pending(io); 13398b004457SMilan Broz } 13408b004457SMilan Broz 134195497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 134295497a96SMilan Broz int error) 134395497a96SMilan Broz { 1344b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 1345b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 134695497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 134749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 134895497a96SMilan Broz 134995497a96SMilan Broz if (error == -EINPROGRESS) { 135095497a96SMilan Broz complete(&ctx->restart); 135195497a96SMilan Broz return; 135295497a96SMilan Broz } 135395497a96SMilan Broz 13542dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 13552dc5327dSMilan Broz error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); 13562dc5327dSMilan Broz 135772c6e7afSMikulas Patocka if (error < 0) 135872c6e7afSMikulas Patocka io->error = -EIO; 135972c6e7afSMikulas Patocka 1360298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 136195497a96SMilan Broz 136240b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 136395497a96SMilan Broz return; 136495497a96SMilan Broz 136595497a96SMilan Broz if (bio_data_dir(io->base_bio) == READ) 136672c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 136795497a96SMilan Broz else 136872c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 136995497a96SMilan Broz } 137095497a96SMilan Broz 13714e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 13724e4eef64SMilan Broz { 13734e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 13744e4eef64SMilan Broz 13754e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 13764e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 13774e4eef64SMilan Broz else 13784e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 13798b004457SMilan Broz } 13808b004457SMilan Broz 1381395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 1382395b167cSAlasdair G Kergon { 138349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1384395b167cSAlasdair G Kergon 1385395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 1386395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 1387395b167cSAlasdair G Kergon } 1388395b167cSAlasdair G Kergon 13891da177e4SLinus Torvalds /* 13901da177e4SLinus Torvalds * Decode key from its hex representation 13911da177e4SLinus Torvalds */ 13921da177e4SLinus Torvalds static int crypt_decode_key(u8 *key, char *hex, unsigned int size) 13931da177e4SLinus Torvalds { 13941da177e4SLinus Torvalds char buffer[3]; 13951da177e4SLinus Torvalds unsigned int i; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds buffer[2] = '\0'; 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds for (i = 0; i < size; i++) { 14001da177e4SLinus Torvalds buffer[0] = *hex++; 14011da177e4SLinus Torvalds buffer[1] = *hex++; 14021da177e4SLinus Torvalds 14031a66a08aSmajianpeng if (kstrtou8(buffer, 16, &key[i])) 14041da177e4SLinus Torvalds return -EINVAL; 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 14071da177e4SLinus Torvalds if (*hex != '\0') 14081da177e4SLinus Torvalds return -EINVAL; 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds return 0; 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds 1413fd2d231fSMikulas Patocka static void crypt_free_tfms(struct crypt_config *cc) 1414d1f96423SMilan Broz { 1415d1f96423SMilan Broz unsigned i; 1416d1f96423SMilan Broz 1417fd2d231fSMikulas Patocka if (!cc->tfms) 1418fd2d231fSMikulas Patocka return; 1419fd2d231fSMikulas Patocka 1420d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 1421fd2d231fSMikulas Patocka if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { 1422fd2d231fSMikulas Patocka crypto_free_ablkcipher(cc->tfms[i]); 1423fd2d231fSMikulas Patocka cc->tfms[i] = NULL; 1424d1f96423SMilan Broz } 1425d1f96423SMilan Broz 1426fd2d231fSMikulas Patocka kfree(cc->tfms); 1427fd2d231fSMikulas Patocka cc->tfms = NULL; 1428fd2d231fSMikulas Patocka } 1429fd2d231fSMikulas Patocka 1430fd2d231fSMikulas Patocka static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 1431d1f96423SMilan Broz { 1432d1f96423SMilan Broz unsigned i; 1433d1f96423SMilan Broz int err; 1434d1f96423SMilan Broz 1435fd2d231fSMikulas Patocka cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), 1436fd2d231fSMikulas Patocka GFP_KERNEL); 1437fd2d231fSMikulas Patocka if (!cc->tfms) 1438fd2d231fSMikulas Patocka return -ENOMEM; 1439fd2d231fSMikulas Patocka 1440d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1441fd2d231fSMikulas Patocka cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); 1442fd2d231fSMikulas Patocka if (IS_ERR(cc->tfms[i])) { 1443fd2d231fSMikulas Patocka err = PTR_ERR(cc->tfms[i]); 1444fd2d231fSMikulas Patocka crypt_free_tfms(cc); 1445d1f96423SMilan Broz return err; 1446d1f96423SMilan Broz } 1447d1f96423SMilan Broz } 1448d1f96423SMilan Broz 1449d1f96423SMilan Broz return 0; 1450d1f96423SMilan Broz } 1451d1f96423SMilan Broz 1452c0297721SAndi Kleen static int crypt_setkey_allcpus(struct crypt_config *cc) 1453c0297721SAndi Kleen { 1454da31a078SMilan Broz unsigned subkey_size; 1455fd2d231fSMikulas Patocka int err = 0, i, r; 1456c0297721SAndi Kleen 1457da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 1458da31a078SMilan Broz subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 1459da31a078SMilan Broz 1460d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1461fd2d231fSMikulas Patocka r = crypto_ablkcipher_setkey(cc->tfms[i], 1462fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 1463fd2d231fSMikulas Patocka subkey_size); 1464c0297721SAndi Kleen if (r) 1465c0297721SAndi Kleen err = r; 1466c0297721SAndi Kleen } 1467c0297721SAndi Kleen 1468c0297721SAndi Kleen return err; 1469c0297721SAndi Kleen } 1470c0297721SAndi Kleen 1471e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 1472e48d4bbfSMilan Broz { 1473de8be5acSMilan Broz int r = -EINVAL; 1474de8be5acSMilan Broz int key_string_len = strlen(key); 1475de8be5acSMilan Broz 147669a8cfcdSMilan Broz /* The key size may not be changed. */ 1477de8be5acSMilan Broz if (cc->key_size != (key_string_len >> 1)) 1478de8be5acSMilan Broz goto out; 1479e48d4bbfSMilan Broz 148069a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 148169a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 1482de8be5acSMilan Broz goto out; 1483e48d4bbfSMilan Broz 148469a8cfcdSMilan Broz if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) 1485de8be5acSMilan Broz goto out; 1486e48d4bbfSMilan Broz 1487e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 1488e48d4bbfSMilan Broz 1489de8be5acSMilan Broz r = crypt_setkey_allcpus(cc); 1490de8be5acSMilan Broz 1491de8be5acSMilan Broz out: 1492de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 1493de8be5acSMilan Broz memset(key, '0', key_string_len); 1494de8be5acSMilan Broz 1495de8be5acSMilan Broz return r; 1496e48d4bbfSMilan Broz } 1497e48d4bbfSMilan Broz 1498e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 1499e48d4bbfSMilan Broz { 1500e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 1501e48d4bbfSMilan Broz memset(&cc->key, 0, cc->key_size * sizeof(u8)); 1502c0297721SAndi Kleen 1503c0297721SAndi Kleen return crypt_setkey_allcpus(cc); 1504e48d4bbfSMilan Broz } 1505e48d4bbfSMilan Broz 150628513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 150728513fccSMilan Broz { 150828513fccSMilan Broz struct crypt_config *cc = ti->private; 150928513fccSMilan Broz 151028513fccSMilan Broz ti->private = NULL; 151128513fccSMilan Broz 151228513fccSMilan Broz if (!cc) 151328513fccSMilan Broz return; 151428513fccSMilan Broz 1515dc267621SMikulas Patocka if (cc->write_thread) 1516dc267621SMikulas Patocka kthread_stop(cc->write_thread); 1517dc267621SMikulas Patocka 151828513fccSMilan Broz if (cc->io_queue) 151928513fccSMilan Broz destroy_workqueue(cc->io_queue); 152028513fccSMilan Broz if (cc->crypt_queue) 152128513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 152228513fccSMilan Broz 1523fd2d231fSMikulas Patocka crypt_free_tfms(cc); 1524fd2d231fSMikulas Patocka 152528513fccSMilan Broz if (cc->bs) 152628513fccSMilan Broz bioset_free(cc->bs); 152728513fccSMilan Broz 152828513fccSMilan Broz if (cc->page_pool) 152928513fccSMilan Broz mempool_destroy(cc->page_pool); 153028513fccSMilan Broz if (cc->req_pool) 153128513fccSMilan Broz mempool_destroy(cc->req_pool); 153228513fccSMilan Broz 153328513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 153428513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 153528513fccSMilan Broz 153628513fccSMilan Broz if (cc->dev) 153728513fccSMilan Broz dm_put_device(ti, cc->dev); 153828513fccSMilan Broz 15395ebaee6dSMilan Broz kzfree(cc->cipher); 15407dbcd137SMilan Broz kzfree(cc->cipher_string); 154128513fccSMilan Broz 154228513fccSMilan Broz /* Must zero key material before freeing */ 154328513fccSMilan Broz kzfree(cc); 154428513fccSMilan Broz } 154528513fccSMilan Broz 15465ebaee6dSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, 15475ebaee6dSMilan Broz char *cipher_in, char *key) 15481da177e4SLinus Torvalds { 15495ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 1550d1f96423SMilan Broz char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; 15515ebaee6dSMilan Broz char *cipher_api = NULL; 1552fd2d231fSMikulas Patocka int ret = -EINVAL; 155331998ef1SMikulas Patocka char dummy; 15541da177e4SLinus Torvalds 15555ebaee6dSMilan Broz /* Convert to crypto api definition? */ 15565ebaee6dSMilan Broz if (strchr(cipher_in, '(')) { 15575ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 15581da177e4SLinus Torvalds return -EINVAL; 15591da177e4SLinus Torvalds } 15601da177e4SLinus Torvalds 15617dbcd137SMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 15627dbcd137SMilan Broz if (!cc->cipher_string) 15637dbcd137SMilan Broz goto bad_mem; 15647dbcd137SMilan Broz 15655ebaee6dSMilan Broz /* 15665ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 1567d1f96423SMilan Broz * cipher[:keycount]-mode-iv:ivopts 15685ebaee6dSMilan Broz */ 15695ebaee6dSMilan Broz tmp = cipher_in; 1570d1f96423SMilan Broz keycount = strsep(&tmp, "-"); 1571d1f96423SMilan Broz cipher = strsep(&keycount, ":"); 1572d1f96423SMilan Broz 1573d1f96423SMilan Broz if (!keycount) 1574d1f96423SMilan Broz cc->tfms_count = 1; 157531998ef1SMikulas Patocka else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 1576d1f96423SMilan Broz !is_power_of_2(cc->tfms_count)) { 1577d1f96423SMilan Broz ti->error = "Bad cipher key count specification"; 1578d1f96423SMilan Broz return -EINVAL; 1579d1f96423SMilan Broz } 1580d1f96423SMilan Broz cc->key_parts = cc->tfms_count; 1581da31a078SMilan Broz cc->key_extra_size = 0; 15825ebaee6dSMilan Broz 15835ebaee6dSMilan Broz cc->cipher = kstrdup(cipher, GFP_KERNEL); 15845ebaee6dSMilan Broz if (!cc->cipher) 15855ebaee6dSMilan Broz goto bad_mem; 15865ebaee6dSMilan Broz 15871da177e4SLinus Torvalds chainmode = strsep(&tmp, "-"); 15881da177e4SLinus Torvalds ivopts = strsep(&tmp, "-"); 15891da177e4SLinus Torvalds ivmode = strsep(&ivopts, ":"); 15901da177e4SLinus Torvalds 15911da177e4SLinus Torvalds if (tmp) 15925ebaee6dSMilan Broz DMWARN("Ignoring unexpected additional cipher options"); 15931da177e4SLinus Torvalds 15947dbcd137SMilan Broz /* 15957dbcd137SMilan Broz * For compatibility with the original dm-crypt mapping format, if 15967dbcd137SMilan Broz * only the cipher name is supplied, use cbc-plain. 15977dbcd137SMilan Broz */ 15985ebaee6dSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { 15991da177e4SLinus Torvalds chainmode = "cbc"; 16001da177e4SLinus Torvalds ivmode = "plain"; 16011da177e4SLinus Torvalds } 16021da177e4SLinus Torvalds 1603d1806f6aSHerbert Xu if (strcmp(chainmode, "ecb") && !ivmode) { 16045ebaee6dSMilan Broz ti->error = "IV mechanism required"; 16055ebaee6dSMilan Broz return -EINVAL; 16061da177e4SLinus Torvalds } 16071da177e4SLinus Torvalds 16085ebaee6dSMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 16095ebaee6dSMilan Broz if (!cipher_api) 16105ebaee6dSMilan Broz goto bad_mem; 16115ebaee6dSMilan Broz 16125ebaee6dSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 16135ebaee6dSMilan Broz "%s(%s)", chainmode, cipher); 16145ebaee6dSMilan Broz if (ret < 0) { 16155ebaee6dSMilan Broz kfree(cipher_api); 16165ebaee6dSMilan Broz goto bad_mem; 1617d1806f6aSHerbert Xu } 1618d1806f6aSHerbert Xu 16195ebaee6dSMilan Broz /* Allocate cipher */ 1620fd2d231fSMikulas Patocka ret = crypt_alloc_tfms(cc, cipher_api); 1621d1f96423SMilan Broz if (ret < 0) { 162272d94861SAlasdair G Kergon ti->error = "Error allocating crypto tfm"; 162328513fccSMilan Broz goto bad; 16241da177e4SLinus Torvalds } 16251da177e4SLinus Torvalds 16265ebaee6dSMilan Broz /* Initialize IV */ 1627c0297721SAndi Kleen cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); 16285ebaee6dSMilan Broz if (cc->iv_size) 16295ebaee6dSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 16305ebaee6dSMilan Broz cc->iv_size = max(cc->iv_size, 16315ebaee6dSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 16325ebaee6dSMilan Broz else if (ivmode) { 16335ebaee6dSMilan Broz DMWARN("Selected cipher does not support IVs"); 16345ebaee6dSMilan Broz ivmode = NULL; 16355ebaee6dSMilan Broz } 16365ebaee6dSMilan Broz 16375ebaee6dSMilan Broz /* Choose ivmode, see comments at iv code. */ 16381da177e4SLinus Torvalds if (ivmode == NULL) 16391da177e4SLinus Torvalds cc->iv_gen_ops = NULL; 16401da177e4SLinus Torvalds else if (strcmp(ivmode, "plain") == 0) 16411da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_plain_ops; 164261afef61SMilan Broz else if (strcmp(ivmode, "plain64") == 0) 164361afef61SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 16441da177e4SLinus Torvalds else if (strcmp(ivmode, "essiv") == 0) 16451da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_essiv_ops; 164648527fa7SRik Snel else if (strcmp(ivmode, "benbi") == 0) 164748527fa7SRik Snel cc->iv_gen_ops = &crypt_iv_benbi_ops; 164846b47730SLudwig Nussel else if (strcmp(ivmode, "null") == 0) 164946b47730SLudwig Nussel cc->iv_gen_ops = &crypt_iv_null_ops; 165034745785SMilan Broz else if (strcmp(ivmode, "lmk") == 0) { 165134745785SMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 1652ed04d981SMilan Broz /* 1653ed04d981SMilan Broz * Version 2 and 3 is recognised according 165434745785SMilan Broz * to length of provided multi-key string. 165534745785SMilan Broz * If present (version 3), last key is used as IV seed. 1656ed04d981SMilan Broz * All keys (including IV seed) are always the same size. 165734745785SMilan Broz */ 1658da31a078SMilan Broz if (cc->key_size % cc->key_parts) { 165934745785SMilan Broz cc->key_parts++; 1660da31a078SMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 1661da31a078SMilan Broz } 1662ed04d981SMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 1663ed04d981SMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 1664ed04d981SMilan Broz cc->key_parts += 2; /* IV + whitening */ 1665ed04d981SMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 166634745785SMilan Broz } else { 16675ebaee6dSMilan Broz ret = -EINVAL; 166872d94861SAlasdair G Kergon ti->error = "Invalid IV mode"; 166928513fccSMilan Broz goto bad; 16701da177e4SLinus Torvalds } 16711da177e4SLinus Torvalds 1672da31a078SMilan Broz /* Initialize and set key */ 1673da31a078SMilan Broz ret = crypt_set_key(cc, key); 1674da31a078SMilan Broz if (ret < 0) { 1675da31a078SMilan Broz ti->error = "Error decoding and setting key"; 1676da31a078SMilan Broz goto bad; 1677da31a078SMilan Broz } 1678da31a078SMilan Broz 167928513fccSMilan Broz /* Allocate IV */ 168028513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 168128513fccSMilan Broz ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 168228513fccSMilan Broz if (ret < 0) { 168328513fccSMilan Broz ti->error = "Error creating IV"; 168428513fccSMilan Broz goto bad; 168528513fccSMilan Broz } 168628513fccSMilan Broz } 16871da177e4SLinus Torvalds 168828513fccSMilan Broz /* Initialize IV (set keys for ESSIV etc) */ 168928513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 169028513fccSMilan Broz ret = cc->iv_gen_ops->init(cc); 169128513fccSMilan Broz if (ret < 0) { 1692b95bf2d3SMilan Broz ti->error = "Error initialising IV"; 169328513fccSMilan Broz goto bad; 169428513fccSMilan Broz } 1695b95bf2d3SMilan Broz } 1696b95bf2d3SMilan Broz 16975ebaee6dSMilan Broz ret = 0; 16985ebaee6dSMilan Broz bad: 16995ebaee6dSMilan Broz kfree(cipher_api); 17005ebaee6dSMilan Broz return ret; 17015ebaee6dSMilan Broz 17025ebaee6dSMilan Broz bad_mem: 17035ebaee6dSMilan Broz ti->error = "Cannot allocate cipher strings"; 17045ebaee6dSMilan Broz return -ENOMEM; 17051da177e4SLinus Torvalds } 17065ebaee6dSMilan Broz 17075ebaee6dSMilan Broz /* 17085ebaee6dSMilan Broz * Construct an encryption mapping: 17095ebaee6dSMilan Broz * <cipher> <key> <iv_offset> <dev_path> <start> 17105ebaee6dSMilan Broz */ 17115ebaee6dSMilan Broz static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 17125ebaee6dSMilan Broz { 17135ebaee6dSMilan Broz struct crypt_config *cc; 1714772ae5f5SMilan Broz unsigned int key_size, opt_params; 17155ebaee6dSMilan Broz unsigned long long tmpll; 17165ebaee6dSMilan Broz int ret; 1717d49ec52fSMikulas Patocka size_t iv_size_padding; 1718772ae5f5SMilan Broz struct dm_arg_set as; 1719772ae5f5SMilan Broz const char *opt_string; 172031998ef1SMikulas Patocka char dummy; 17215ebaee6dSMilan Broz 1722772ae5f5SMilan Broz static struct dm_arg _args[] = { 17230f5d8e6eSMikulas Patocka {0, 3, "Invalid number of feature args"}, 1724772ae5f5SMilan Broz }; 1725772ae5f5SMilan Broz 1726772ae5f5SMilan Broz if (argc < 5) { 17275ebaee6dSMilan Broz ti->error = "Not enough arguments"; 17285ebaee6dSMilan Broz return -EINVAL; 17291da177e4SLinus Torvalds } 17301da177e4SLinus Torvalds 17315ebaee6dSMilan Broz key_size = strlen(argv[1]) >> 1; 17325ebaee6dSMilan Broz 17335ebaee6dSMilan Broz cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); 17345ebaee6dSMilan Broz if (!cc) { 17355ebaee6dSMilan Broz ti->error = "Cannot allocate encryption context"; 17365ebaee6dSMilan Broz return -ENOMEM; 17375ebaee6dSMilan Broz } 173869a8cfcdSMilan Broz cc->key_size = key_size; 17395ebaee6dSMilan Broz 17405ebaee6dSMilan Broz ti->private = cc; 17415ebaee6dSMilan Broz ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 17425ebaee6dSMilan Broz if (ret < 0) 17435ebaee6dSMilan Broz goto bad; 17445ebaee6dSMilan Broz 1745ddd42edfSMilan Broz cc->dmreq_start = sizeof(struct ablkcipher_request); 1746c0297721SAndi Kleen cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); 1747d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 1748d49ec52fSMikulas Patocka 1749d49ec52fSMikulas Patocka if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { 1750d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 1751d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 1752d49ec52fSMikulas Patocka & crypto_ablkcipher_alignmask(any_tfm(cc)); 1753d49ec52fSMikulas Patocka } else { 1754d49ec52fSMikulas Patocka /* 1755d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 1756d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 1757d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 1758d49ec52fSMikulas Patocka */ 1759d49ec52fSMikulas Patocka iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); 1760d49ec52fSMikulas Patocka } 1761ddd42edfSMilan Broz 176294f5e024SMikulas Patocka ret = -ENOMEM; 1763ddd42edfSMilan Broz cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + 1764d49ec52fSMikulas Patocka sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); 1765ddd42edfSMilan Broz if (!cc->req_pool) { 1766ddd42edfSMilan Broz ti->error = "Cannot allocate crypt request mempool"; 176728513fccSMilan Broz goto bad; 1768ddd42edfSMilan Broz } 1769ddd42edfSMilan Broz 1770298a9fa0SMikulas Patocka cc->per_bio_data_size = ti->per_bio_data_size = 1771d49ec52fSMikulas Patocka ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + 1772d49ec52fSMikulas Patocka sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, 1773d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 1774298a9fa0SMikulas Patocka 1775cf2f1abfSMikulas Patocka cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); 17761da177e4SLinus Torvalds if (!cc->page_pool) { 177772d94861SAlasdair G Kergon ti->error = "Cannot allocate page mempool"; 177828513fccSMilan Broz goto bad; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 1781bb799ca0SJens Axboe cc->bs = bioset_create(MIN_IOS, 0); 17826a24c718SMilan Broz if (!cc->bs) { 17836a24c718SMilan Broz ti->error = "Cannot allocate crypt bioset"; 178428513fccSMilan Broz goto bad; 17856a24c718SMilan Broz } 17866a24c718SMilan Broz 17877145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 17887145c241SMikulas Patocka 178928513fccSMilan Broz ret = -EINVAL; 179031998ef1SMikulas Patocka if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { 179172d94861SAlasdair G Kergon ti->error = "Invalid iv_offset sector"; 179228513fccSMilan Broz goto bad; 17931da177e4SLinus Torvalds } 17944ee218cdSAndrew Morton cc->iv_offset = tmpll; 17951da177e4SLinus Torvalds 179628513fccSMilan Broz if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { 179728513fccSMilan Broz ti->error = "Device lookup failed"; 179828513fccSMilan Broz goto bad; 179928513fccSMilan Broz } 180028513fccSMilan Broz 180131998ef1SMikulas Patocka if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { 180272d94861SAlasdair G Kergon ti->error = "Invalid device sector"; 180328513fccSMilan Broz goto bad; 18041da177e4SLinus Torvalds } 18054ee218cdSAndrew Morton cc->start = tmpll; 18061da177e4SLinus Torvalds 1807772ae5f5SMilan Broz argv += 5; 1808772ae5f5SMilan Broz argc -= 5; 1809772ae5f5SMilan Broz 1810772ae5f5SMilan Broz /* Optional parameters */ 1811772ae5f5SMilan Broz if (argc) { 1812772ae5f5SMilan Broz as.argc = argc; 1813772ae5f5SMilan Broz as.argv = argv; 1814772ae5f5SMilan Broz 1815772ae5f5SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 1816772ae5f5SMilan Broz if (ret) 1817772ae5f5SMilan Broz goto bad; 1818772ae5f5SMilan Broz 1819f3396c58SMikulas Patocka while (opt_params--) { 1820772ae5f5SMilan Broz opt_string = dm_shift_arg(&as); 1821f3396c58SMikulas Patocka if (!opt_string) { 1822f3396c58SMikulas Patocka ti->error = "Not enough feature arguments"; 1823f3396c58SMikulas Patocka goto bad; 1824f3396c58SMikulas Patocka } 1825772ae5f5SMilan Broz 1826f3396c58SMikulas Patocka if (!strcasecmp(opt_string, "allow_discards")) 182755a62eefSAlasdair G Kergon ti->num_discard_bios = 1; 1828f3396c58SMikulas Patocka 1829f3396c58SMikulas Patocka else if (!strcasecmp(opt_string, "same_cpu_crypt")) 1830f3396c58SMikulas Patocka set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 1831f3396c58SMikulas Patocka 18320f5d8e6eSMikulas Patocka else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 18330f5d8e6eSMikulas Patocka set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 18340f5d8e6eSMikulas Patocka 1835f3396c58SMikulas Patocka else { 1836772ae5f5SMilan Broz ti->error = "Invalid feature arguments"; 1837772ae5f5SMilan Broz goto bad; 1838772ae5f5SMilan Broz } 1839772ae5f5SMilan Broz } 1840f3396c58SMikulas Patocka } 1841772ae5f5SMilan Broz 184228513fccSMilan Broz ret = -ENOMEM; 1843670368a8STejun Heo cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); 1844cabf08e4SMilan Broz if (!cc->io_queue) { 1845cabf08e4SMilan Broz ti->error = "Couldn't create kcryptd io queue"; 184628513fccSMilan Broz goto bad; 1847cabf08e4SMilan Broz } 1848cabf08e4SMilan Broz 1849f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 1850f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); 1851f3396c58SMikulas Patocka else 1852f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 1853f3396c58SMikulas Patocka num_online_cpus()); 1854cabf08e4SMilan Broz if (!cc->crypt_queue) { 18559934a8beSMilan Broz ti->error = "Couldn't create kcryptd queue"; 185628513fccSMilan Broz goto bad; 18579934a8beSMilan Broz } 18589934a8beSMilan Broz 1859dc267621SMikulas Patocka init_waitqueue_head(&cc->write_thread_wait); 1860b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1861dc267621SMikulas Patocka 1862dc267621SMikulas Patocka cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); 1863dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 1864dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 1865dc267621SMikulas Patocka cc->write_thread = NULL; 1866dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 1867dc267621SMikulas Patocka goto bad; 1868dc267621SMikulas Patocka } 1869dc267621SMikulas Patocka wake_up_process(cc->write_thread); 1870dc267621SMikulas Patocka 187155a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 18720ac55489SAlasdair G Kergon ti->discard_zeroes_data_unsupported = true; 1873983c7db3SMilan Broz 18741da177e4SLinus Torvalds return 0; 18751da177e4SLinus Torvalds 187628513fccSMilan Broz bad: 187728513fccSMilan Broz crypt_dtr(ti); 187828513fccSMilan Broz return ret; 18791da177e4SLinus Torvalds } 18801da177e4SLinus Torvalds 18817de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 18821da177e4SLinus Torvalds { 1883028867acSAlasdair G Kergon struct dm_crypt_io *io; 188449a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 1885647c7db1SMikulas Patocka 1886772ae5f5SMilan Broz /* 1887772ae5f5SMilan Broz * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. 1888772ae5f5SMilan Broz * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight 1889772ae5f5SMilan Broz * - for REQ_DISCARD caller must use flush if IO ordering matters 1890772ae5f5SMilan Broz */ 1891772ae5f5SMilan Broz if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { 1892647c7db1SMikulas Patocka bio->bi_bdev = cc->dev->bdev; 1893772ae5f5SMilan Broz if (bio_sectors(bio)) 18944f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 18954f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 1896647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 1897647c7db1SMikulas Patocka } 18981da177e4SLinus Torvalds 1899298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 1900298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 1901298a9fa0SMikulas Patocka io->ctx.req = (struct ablkcipher_request *)(io + 1); 1902cabf08e4SMilan Broz 190320c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 190420c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 1905dc267621SMikulas Patocka kcryptd_queue_read(io); 190620c82538SMilan Broz } else 1907cabf08e4SMilan Broz kcryptd_queue_crypt(io); 19081da177e4SLinus Torvalds 1909d2a7ad29SKiyoshi Ueda return DM_MAPIO_SUBMITTED; 19101da177e4SLinus Torvalds } 19111da177e4SLinus Torvalds 1912fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 19131f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 19141da177e4SLinus Torvalds { 19155ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 1916fd7c092eSMikulas Patocka unsigned i, sz = 0; 1917f3396c58SMikulas Patocka int num_feature_args = 0; 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds switch (type) { 19201da177e4SLinus Torvalds case STATUSTYPE_INFO: 19211da177e4SLinus Torvalds result[0] = '\0'; 19221da177e4SLinus Torvalds break; 19231da177e4SLinus Torvalds 19241da177e4SLinus Torvalds case STATUSTYPE_TABLE: 19257dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 19261da177e4SLinus Torvalds 1927fd7c092eSMikulas Patocka if (cc->key_size > 0) 1928fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 1929fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 1930fd7c092eSMikulas Patocka else 1931fd7c092eSMikulas Patocka DMEMIT("-"); 19321da177e4SLinus Torvalds 19334ee218cdSAndrew Morton DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 19344ee218cdSAndrew Morton cc->dev->name, (unsigned long long)cc->start); 1935772ae5f5SMilan Broz 1936f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 1937f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 19380f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 1939f3396c58SMikulas Patocka if (num_feature_args) { 1940f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 194155a62eefSAlasdair G Kergon if (ti->num_discard_bios) 1942f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 1943f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 1944f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 19450f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 19460f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 1947f3396c58SMikulas Patocka } 1948772ae5f5SMilan Broz 19491da177e4SLinus Torvalds break; 19501da177e4SLinus Torvalds } 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 1953e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 1954e48d4bbfSMilan Broz { 1955e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 1956e48d4bbfSMilan Broz 1957e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 1958e48d4bbfSMilan Broz } 1959e48d4bbfSMilan Broz 1960e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 1961e48d4bbfSMilan Broz { 1962e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 1963e48d4bbfSMilan Broz 1964e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 1965e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 1966e48d4bbfSMilan Broz return -EAGAIN; 1967e48d4bbfSMilan Broz } 1968e48d4bbfSMilan Broz 1969e48d4bbfSMilan Broz return 0; 1970e48d4bbfSMilan Broz } 1971e48d4bbfSMilan Broz 1972e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 1973e48d4bbfSMilan Broz { 1974e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 1975e48d4bbfSMilan Broz 1976e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 1977e48d4bbfSMilan Broz } 1978e48d4bbfSMilan Broz 1979e48d4bbfSMilan Broz /* Message interface 1980e48d4bbfSMilan Broz * key set <key> 1981e48d4bbfSMilan Broz * key wipe 1982e48d4bbfSMilan Broz */ 1983e48d4bbfSMilan Broz static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) 1984e48d4bbfSMilan Broz { 1985e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 1986542da317SMilan Broz int ret = -EINVAL; 1987e48d4bbfSMilan Broz 1988e48d4bbfSMilan Broz if (argc < 2) 1989e48d4bbfSMilan Broz goto error; 1990e48d4bbfSMilan Broz 1991498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 1992e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 1993e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 1994e48d4bbfSMilan Broz return -EINVAL; 1995e48d4bbfSMilan Broz } 1996498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 1997542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 1998542da317SMilan Broz if (ret) 1999542da317SMilan Broz return ret; 2000542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 2001542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 2002542da317SMilan Broz return ret; 2003542da317SMilan Broz } 2004498f0103SMike Snitzer if (argc == 2 && !strcasecmp(argv[1], "wipe")) { 2005542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 2006542da317SMilan Broz ret = cc->iv_gen_ops->wipe(cc); 2007542da317SMilan Broz if (ret) 2008542da317SMilan Broz return ret; 2009542da317SMilan Broz } 2010e48d4bbfSMilan Broz return crypt_wipe_key(cc); 2011e48d4bbfSMilan Broz } 2012542da317SMilan Broz } 2013e48d4bbfSMilan Broz 2014e48d4bbfSMilan Broz error: 2015e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 2016e48d4bbfSMilan Broz return -EINVAL; 2017e48d4bbfSMilan Broz } 2018e48d4bbfSMilan Broz 2019d41e26b9SMilan Broz static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, 2020d41e26b9SMilan Broz struct bio_vec *biovec, int max_size) 2021d41e26b9SMilan Broz { 2022d41e26b9SMilan Broz struct crypt_config *cc = ti->private; 2023d41e26b9SMilan Broz struct request_queue *q = bdev_get_queue(cc->dev->bdev); 2024d41e26b9SMilan Broz 2025d41e26b9SMilan Broz if (!q->merge_bvec_fn) 2026d41e26b9SMilan Broz return max_size; 2027d41e26b9SMilan Broz 2028d41e26b9SMilan Broz bvm->bi_bdev = cc->dev->bdev; 2029b441a262SAlasdair G Kergon bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); 2030d41e26b9SMilan Broz 2031d41e26b9SMilan Broz return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); 2032d41e26b9SMilan Broz } 2033d41e26b9SMilan Broz 2034af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 2035af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 2036af4874e0SMike Snitzer { 2037af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 2038af4874e0SMike Snitzer 20395dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 2040af4874e0SMike Snitzer } 2041af4874e0SMike Snitzer 20421da177e4SLinus Torvalds static struct target_type crypt_target = { 20431da177e4SLinus Torvalds .name = "crypt", 2044f3396c58SMikulas Patocka .version = {1, 14, 0}, 20451da177e4SLinus Torvalds .module = THIS_MODULE, 20461da177e4SLinus Torvalds .ctr = crypt_ctr, 20471da177e4SLinus Torvalds .dtr = crypt_dtr, 20481da177e4SLinus Torvalds .map = crypt_map, 20491da177e4SLinus Torvalds .status = crypt_status, 2050e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 2051e48d4bbfSMilan Broz .preresume = crypt_preresume, 2052e48d4bbfSMilan Broz .resume = crypt_resume, 2053e48d4bbfSMilan Broz .message = crypt_message, 2054d41e26b9SMilan Broz .merge = crypt_merge, 2055af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 20561da177e4SLinus Torvalds }; 20571da177e4SLinus Torvalds 20581da177e4SLinus Torvalds static int __init dm_crypt_init(void) 20591da177e4SLinus Torvalds { 20601da177e4SLinus Torvalds int r; 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 206394f5e024SMikulas Patocka if (r < 0) 206472d94861SAlasdair G Kergon DMERR("register failed %d", r); 20651da177e4SLinus Torvalds 20661da177e4SLinus Torvalds return r; 20671da177e4SLinus Torvalds } 20681da177e4SLinus Torvalds 20691da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 20701da177e4SLinus Torvalds { 207110d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 20721da177e4SLinus Torvalds } 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds module_init(dm_crypt_init); 20751da177e4SLinus Torvalds module_exit(dm_crypt_exit); 20761da177e4SLinus Torvalds 2077bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 20781da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 20791da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2080