11da177e4SLinus Torvalds /* 2bf14299fSJana Saout * Copyright (C) 2003 Jana Saout <jana@saout.de> 31da177e4SLinus Torvalds * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> 4ef43aa38SMilan Broz * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved. 5ef43aa38SMilan Broz * Copyright (C) 2013-2017 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> 15c538f6ecSOndrej Kozina #include <linux/key.h> 161da177e4SLinus Torvalds #include <linux/bio.h> 171da177e4SLinus Torvalds #include <linux/blkdev.h> 181da177e4SLinus Torvalds #include <linux/mempool.h> 191da177e4SLinus Torvalds #include <linux/slab.h> 201da177e4SLinus Torvalds #include <linux/crypto.h> 211da177e4SLinus Torvalds #include <linux/workqueue.h> 22dc267621SMikulas Patocka #include <linux/kthread.h> 233fcfab16SAndrew Morton #include <linux/backing-dev.h> 2460063497SArun Sharma #include <linux/atomic.h> 25378f058cSDavid Hardeman #include <linux/scatterlist.h> 26b3c5fd30SMikulas Patocka #include <linux/rbtree.h> 27027c431cSOndrej Kozina #include <linux/ctype.h> 281da177e4SLinus Torvalds #include <asm/page.h> 2948527fa7SRik Snel #include <asm/unaligned.h> 3034745785SMilan Broz #include <crypto/hash.h> 3134745785SMilan Broz #include <crypto/md5.h> 3234745785SMilan Broz #include <crypto/algapi.h> 33bbdb23b5SHerbert Xu #include <crypto/skcipher.h> 34ef43aa38SMilan Broz #include <crypto/aead.h> 35ef43aa38SMilan Broz #include <crypto/authenc.h> 36ef43aa38SMilan Broz #include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ 37c538f6ecSOndrej Kozina #include <keys/user-type.h> 381da177e4SLinus Torvalds 39586e80e6SMikulas Patocka #include <linux/device-mapper.h> 401da177e4SLinus Torvalds 4172d94861SAlasdair G Kergon #define DM_MSG_PREFIX "crypt" 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* 441da177e4SLinus Torvalds * context holding the current state of a multi-part conversion 451da177e4SLinus Torvalds */ 461da177e4SLinus Torvalds struct convert_context { 4743d69034SMilan Broz struct completion restart; 481da177e4SLinus Torvalds struct bio *bio_in; 491da177e4SLinus Torvalds struct bio *bio_out; 50003b5c57SKent Overstreet struct bvec_iter iter_in; 51003b5c57SKent Overstreet struct bvec_iter iter_out; 52c66029f4SMikulas Patocka sector_t cc_sector; 5340b6229bSMikulas Patocka atomic_t cc_pending; 54ef43aa38SMilan Broz union { 55bbdb23b5SHerbert Xu struct skcipher_request *req; 56ef43aa38SMilan Broz struct aead_request *req_aead; 57ef43aa38SMilan Broz } r; 58ef43aa38SMilan Broz 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 6153017030SMilan Broz /* 6253017030SMilan Broz * per bio private data 6353017030SMilan Broz */ 6453017030SMilan Broz struct dm_crypt_io { 6549a8a920SAlasdair G Kergon struct crypt_config *cc; 6653017030SMilan Broz struct bio *base_bio; 67ef43aa38SMilan Broz u8 *integrity_metadata; 68ef43aa38SMilan Broz bool integrity_metadata_from_pool; 6953017030SMilan Broz struct work_struct work; 7053017030SMilan Broz 7153017030SMilan Broz struct convert_context ctx; 7253017030SMilan Broz 7340b6229bSMikulas Patocka atomic_t io_pending; 7453017030SMilan Broz int error; 750c395b0fSMilan Broz sector_t sector; 76dc267621SMikulas Patocka 77b3c5fd30SMikulas Patocka struct rb_node rb_node; 78298a9fa0SMikulas Patocka } CRYPTO_MINALIGN_ATTR; 7953017030SMilan Broz 8001482b76SMilan Broz struct dm_crypt_request { 81b2174eebSHuang Ying struct convert_context *ctx; 82ef43aa38SMilan Broz struct scatterlist sg_in[4]; 83ef43aa38SMilan Broz struct scatterlist sg_out[4]; 842dc5327dSMilan Broz sector_t iv_sector; 8501482b76SMilan Broz }; 8601482b76SMilan Broz 871da177e4SLinus Torvalds struct crypt_config; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds struct crypt_iv_operations { 901da177e4SLinus Torvalds int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 911da177e4SLinus Torvalds const char *opts); 921da177e4SLinus Torvalds void (*dtr)(struct crypt_config *cc); 93b95bf2d3SMilan Broz int (*init)(struct crypt_config *cc); 94542da317SMilan Broz int (*wipe)(struct crypt_config *cc); 952dc5327dSMilan Broz int (*generator)(struct crypt_config *cc, u8 *iv, 962dc5327dSMilan Broz struct dm_crypt_request *dmreq); 972dc5327dSMilan Broz int (*post)(struct crypt_config *cc, u8 *iv, 982dc5327dSMilan Broz struct dm_crypt_request *dmreq); 991da177e4SLinus Torvalds }; 1001da177e4SLinus Torvalds 10160473592SMilan Broz struct iv_essiv_private { 102bbdb23b5SHerbert Xu struct crypto_ahash *hash_tfm; 103b95bf2d3SMilan Broz u8 *salt; 10460473592SMilan Broz }; 10560473592SMilan Broz 10660473592SMilan Broz struct iv_benbi_private { 10760473592SMilan Broz int shift; 10860473592SMilan Broz }; 10960473592SMilan Broz 11034745785SMilan Broz #define LMK_SEED_SIZE 64 /* hash + 0 */ 11134745785SMilan Broz struct iv_lmk_private { 11234745785SMilan Broz struct crypto_shash *hash_tfm; 11334745785SMilan Broz u8 *seed; 11434745785SMilan Broz }; 11534745785SMilan Broz 116ed04d981SMilan Broz #define TCW_WHITENING_SIZE 16 117ed04d981SMilan Broz struct iv_tcw_private { 118ed04d981SMilan Broz struct crypto_shash *crc32_tfm; 119ed04d981SMilan Broz u8 *iv_seed; 120ed04d981SMilan Broz u8 *whitening; 121ed04d981SMilan Broz }; 122ed04d981SMilan Broz 1231da177e4SLinus Torvalds /* 1241da177e4SLinus Torvalds * Crypt: maps a linear range of a block device 1251da177e4SLinus Torvalds * and encrypts / decrypts at the same time. 1261da177e4SLinus Torvalds */ 1270f5d8e6eSMikulas Patocka enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 128f659b100SRabin Vincent DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; 129c0297721SAndi Kleen 130ef43aa38SMilan Broz enum cipher_flags { 131ef43aa38SMilan Broz CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */ 1328f0009a2SMilan Broz CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 133ef43aa38SMilan Broz }; 134ef43aa38SMilan Broz 135c0297721SAndi Kleen /* 136610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 137c0297721SAndi Kleen */ 1381da177e4SLinus Torvalds struct crypt_config { 1391da177e4SLinus Torvalds struct dm_dev *dev; 1401da177e4SLinus Torvalds sector_t start; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* 143ef43aa38SMilan Broz * pool for per bio private data, crypto requests, 144ef43aa38SMilan Broz * encryption requeusts/buffer pages and integrity tags 1451da177e4SLinus Torvalds */ 146ddd42edfSMilan Broz mempool_t *req_pool; 1471da177e4SLinus Torvalds mempool_t *page_pool; 148ef43aa38SMilan Broz mempool_t *tag_pool; 149ef43aa38SMilan Broz unsigned tag_pool_max_sectors; 150ef43aa38SMilan Broz 1516a24c718SMilan Broz struct bio_set *bs; 1527145c241SMikulas Patocka struct mutex bio_alloc_lock; 1531da177e4SLinus Torvalds 154cabf08e4SMilan Broz struct workqueue_struct *io_queue; 155cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1563f1e9070SMilan Broz 157dc267621SMikulas Patocka struct task_struct *write_thread; 158dc267621SMikulas Patocka wait_queue_head_t write_thread_wait; 159b3c5fd30SMikulas Patocka struct rb_root write_tree; 160dc267621SMikulas Patocka 1615ebaee6dSMilan Broz char *cipher; 1627dbcd137SMilan Broz char *cipher_string; 163ef43aa38SMilan Broz char *cipher_auth; 164c538f6ecSOndrej Kozina char *key_string; 1655ebaee6dSMilan Broz 1661b1b58f5SJulia Lawall const struct crypt_iv_operations *iv_gen_ops; 16779066ad3SHerbert Xu union { 16860473592SMilan Broz struct iv_essiv_private essiv; 16960473592SMilan Broz struct iv_benbi_private benbi; 17034745785SMilan Broz struct iv_lmk_private lmk; 171ed04d981SMilan Broz struct iv_tcw_private tcw; 17279066ad3SHerbert Xu } iv_gen_private; 1731da177e4SLinus Torvalds sector_t iv_offset; 1741da177e4SLinus Torvalds unsigned int iv_size; 175ff3af92bSMikulas Patocka unsigned short int sector_size; 176ff3af92bSMikulas Patocka unsigned char sector_shift; 1771da177e4SLinus Torvalds 178fd2d231fSMikulas Patocka /* ESSIV: struct crypto_cipher *essiv_tfm */ 179fd2d231fSMikulas Patocka void *iv_private; 180ef43aa38SMilan Broz union { 181bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 182ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 183ef43aa38SMilan Broz } cipher_tfm; 184d1f96423SMilan Broz unsigned tfms_count; 185ef43aa38SMilan Broz unsigned long cipher_flags; 186c0297721SAndi Kleen 187c0297721SAndi Kleen /* 188ddd42edfSMilan Broz * Layout of each crypto request: 189ddd42edfSMilan Broz * 190bbdb23b5SHerbert Xu * struct skcipher_request 191ddd42edfSMilan Broz * context 192ddd42edfSMilan Broz * padding 193ddd42edfSMilan Broz * struct dm_crypt_request 194ddd42edfSMilan Broz * padding 195ddd42edfSMilan Broz * IV 196ddd42edfSMilan Broz * 197ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 198ddd42edfSMilan Broz * correctly aligned. 199ddd42edfSMilan Broz */ 200ddd42edfSMilan Broz unsigned int dmreq_start; 201ddd42edfSMilan Broz 202298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 203298a9fa0SMikulas Patocka 204e48d4bbfSMilan Broz unsigned long flags; 2051da177e4SLinus Torvalds unsigned int key_size; 206da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 207da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 208ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 209ef43aa38SMilan Broz 210ef43aa38SMilan Broz unsigned int integrity_tag_size; 211ef43aa38SMilan Broz unsigned int integrity_iv_size; 212ef43aa38SMilan Broz unsigned int on_disk_tag_size; 213ef43aa38SMilan Broz 214ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 2151da177e4SLinus Torvalds u8 key[0]; 2161da177e4SLinus Torvalds }; 2171da177e4SLinus Torvalds 2180a83df6cSMikulas Patocka #define MIN_IOS 64 219ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 220ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2211da177e4SLinus Torvalds 222028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 223395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 224ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 225ef43aa38SMilan Broz struct scatterlist *sg); 226027581f3SOlaf Kirch 227c0297721SAndi Kleen /* 22886f917adSEric Biggers * Use this to access cipher attributes that are independent of the key. 229c0297721SAndi Kleen */ 230bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 231c0297721SAndi Kleen { 232ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 233ef43aa38SMilan Broz } 234ef43aa38SMilan Broz 235ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 236ef43aa38SMilan Broz { 237ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 238c0297721SAndi Kleen } 239c0297721SAndi Kleen 2401da177e4SLinus Torvalds /* 2411da177e4SLinus Torvalds * Different IV generation algorithms: 2421da177e4SLinus Torvalds * 2433c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2443a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2451da177e4SLinus Torvalds * 24661afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 24761afef61SMilan Broz * number, padded with zeros if necessary. 24861afef61SMilan Broz * 2493c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2501da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2511da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2521da177e4SLinus Torvalds * 25348527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 25448527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 25548527fa7SRik Snel * 25646b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 25746b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 25846b47730SLudwig Nussel * 25934745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 26034745785SMilan Broz * by the Loop-AES block device encryption system 26134745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 26234745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 26334745785SMilan Broz * with an IV derived from the sector number, the data and 26434745785SMilan Broz * optionally extra IV seed. 26534745785SMilan Broz * This means that after decryption the first block 26634745785SMilan Broz * of sector must be tweaked according to decrypted data. 26734745785SMilan Broz * Loop-AES can use three encryption schemes: 26834745785SMilan Broz * version 1: is plain aes-cbc mode 26934745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 27034745785SMilan Broz * version 3: the same as version 2 with additional IV seed 27134745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 27234745785SMilan Broz * 273ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 274ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 275e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 276ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 277ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 278ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 279ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 280ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 281ed04d981SMilan Broz * and should be used for old compatible containers access only. 282ed04d981SMilan Broz * 2831da177e4SLinus Torvalds * plumb: unimplemented, see: 2841da177e4SLinus Torvalds * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 2851da177e4SLinus Torvalds */ 2861da177e4SLinus Torvalds 2872dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 2882dc5327dSMilan Broz struct dm_crypt_request *dmreq) 2891da177e4SLinus Torvalds { 2901da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 291283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds return 0; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 29661afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 2972dc5327dSMilan Broz struct dm_crypt_request *dmreq) 29861afef61SMilan Broz { 29961afef61SMilan Broz memset(iv, 0, cc->iv_size); 300283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 30161afef61SMilan Broz 30261afef61SMilan Broz return 0; 30361afef61SMilan Broz } 30461afef61SMilan Broz 305b95bf2d3SMilan Broz /* Initialise ESSIV - compute salt but no local memory allocations */ 306b95bf2d3SMilan Broz static int crypt_iv_essiv_init(struct crypt_config *cc) 307b95bf2d3SMilan Broz { 308b95bf2d3SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 309bbdb23b5SHerbert Xu AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); 310b95bf2d3SMilan Broz struct scatterlist sg; 311c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 312fd2d231fSMikulas Patocka int err; 313b95bf2d3SMilan Broz 314b95bf2d3SMilan Broz sg_init_one(&sg, cc->key, cc->key_size); 315bbdb23b5SHerbert Xu ahash_request_set_tfm(req, essiv->hash_tfm); 316bbdb23b5SHerbert Xu ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); 317bbdb23b5SHerbert Xu ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); 318b95bf2d3SMilan Broz 319bbdb23b5SHerbert Xu err = crypto_ahash_digest(req); 320bbdb23b5SHerbert Xu ahash_request_zero(req); 321b95bf2d3SMilan Broz if (err) 322b95bf2d3SMilan Broz return err; 323b95bf2d3SMilan Broz 324fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 325c0297721SAndi Kleen 326c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, essiv->salt, 327bbdb23b5SHerbert Xu crypto_ahash_digestsize(essiv->hash_tfm)); 328c0297721SAndi Kleen if (err) 329c0297721SAndi Kleen return err; 330c0297721SAndi Kleen 331c0297721SAndi Kleen return 0; 332b95bf2d3SMilan Broz } 333b95bf2d3SMilan Broz 334542da317SMilan Broz /* Wipe salt and reset key derived from volume key */ 335542da317SMilan Broz static int crypt_iv_essiv_wipe(struct crypt_config *cc) 336542da317SMilan Broz { 337542da317SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 338bbdb23b5SHerbert Xu unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); 339c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 340fd2d231fSMikulas Patocka int r, err = 0; 341542da317SMilan Broz 342542da317SMilan Broz memset(essiv->salt, 0, salt_size); 343542da317SMilan Broz 344fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 345c0297721SAndi Kleen r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); 346c0297721SAndi Kleen if (r) 347c0297721SAndi Kleen err = r; 348c0297721SAndi Kleen 349c0297721SAndi Kleen return err; 350c0297721SAndi Kleen } 351c0297721SAndi Kleen 35286f917adSEric Biggers /* Allocate the cipher for ESSIV */ 35386f917adSEric Biggers static struct crypto_cipher *alloc_essiv_cipher(struct crypt_config *cc, 354c0297721SAndi Kleen struct dm_target *ti, 35586f917adSEric Biggers const u8 *salt, 35686f917adSEric Biggers unsigned int saltsize) 357c0297721SAndi Kleen { 358c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 359c0297721SAndi Kleen int err; 360c0297721SAndi Kleen 361c0297721SAndi Kleen /* Setup the essiv_tfm with the given salt */ 362c0297721SAndi Kleen essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); 363c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 364c0297721SAndi Kleen ti->error = "Error allocating crypto tfm for ESSIV"; 365c0297721SAndi Kleen return essiv_tfm; 366c0297721SAndi Kleen } 367c0297721SAndi Kleen 368ef43aa38SMilan Broz if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { 369c0297721SAndi Kleen ti->error = "Block size of ESSIV cipher does " 370c0297721SAndi Kleen "not match IV size of block cipher"; 371c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 372c0297721SAndi Kleen return ERR_PTR(-EINVAL); 373c0297721SAndi Kleen } 374c0297721SAndi Kleen 375c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); 376c0297721SAndi Kleen if (err) { 377c0297721SAndi Kleen ti->error = "Failed to set key for ESSIV cipher"; 378c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 379c0297721SAndi Kleen return ERR_PTR(err); 380c0297721SAndi Kleen } 381c0297721SAndi Kleen 382c0297721SAndi Kleen return essiv_tfm; 383542da317SMilan Broz } 384542da317SMilan Broz 38560473592SMilan Broz static void crypt_iv_essiv_dtr(struct crypt_config *cc) 38660473592SMilan Broz { 387c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 38860473592SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 38960473592SMilan Broz 390bbdb23b5SHerbert Xu crypto_free_ahash(essiv->hash_tfm); 391b95bf2d3SMilan Broz essiv->hash_tfm = NULL; 392b95bf2d3SMilan Broz 393b95bf2d3SMilan Broz kzfree(essiv->salt); 394b95bf2d3SMilan Broz essiv->salt = NULL; 395c0297721SAndi Kleen 396fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 397c0297721SAndi Kleen 398c0297721SAndi Kleen if (essiv_tfm) 399c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 400c0297721SAndi Kleen 401fd2d231fSMikulas Patocka cc->iv_private = NULL; 40260473592SMilan Broz } 40360473592SMilan Broz 4041da177e4SLinus Torvalds static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, 4051da177e4SLinus Torvalds const char *opts) 4061da177e4SLinus Torvalds { 4075861f1beSMilan Broz struct crypto_cipher *essiv_tfm = NULL; 408bbdb23b5SHerbert Xu struct crypto_ahash *hash_tfm = NULL; 4095861f1beSMilan Broz u8 *salt = NULL; 410fd2d231fSMikulas Patocka int err; 4111da177e4SLinus Torvalds 4125861f1beSMilan Broz if (!opts) { 41372d94861SAlasdair G Kergon ti->error = "Digest algorithm missing for ESSIV mode"; 4141da177e4SLinus Torvalds return -EINVAL; 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 417b95bf2d3SMilan Broz /* Allocate hash algorithm */ 418bbdb23b5SHerbert Xu hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); 41935058687SHerbert Xu if (IS_ERR(hash_tfm)) { 42072d94861SAlasdair G Kergon ti->error = "Error initializing ESSIV hash"; 4215861f1beSMilan Broz err = PTR_ERR(hash_tfm); 4225861f1beSMilan Broz goto bad; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 425bbdb23b5SHerbert Xu salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); 4265861f1beSMilan Broz if (!salt) { 42772d94861SAlasdair G Kergon ti->error = "Error kmallocing salt storage in ESSIV"; 4285861f1beSMilan Broz err = -ENOMEM; 4295861f1beSMilan Broz goto bad; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 432b95bf2d3SMilan Broz cc->iv_gen_private.essiv.salt = salt; 433b95bf2d3SMilan Broz cc->iv_gen_private.essiv.hash_tfm = hash_tfm; 434b95bf2d3SMilan Broz 43586f917adSEric Biggers essiv_tfm = alloc_essiv_cipher(cc, ti, salt, 436bbdb23b5SHerbert Xu crypto_ahash_digestsize(hash_tfm)); 437c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 438c0297721SAndi Kleen crypt_iv_essiv_dtr(cc); 439c0297721SAndi Kleen return PTR_ERR(essiv_tfm); 440c0297721SAndi Kleen } 441fd2d231fSMikulas Patocka cc->iv_private = essiv_tfm; 442c0297721SAndi Kleen 4431da177e4SLinus Torvalds return 0; 4445861f1beSMilan Broz 4455861f1beSMilan Broz bad: 4465861f1beSMilan Broz if (hash_tfm && !IS_ERR(hash_tfm)) 447bbdb23b5SHerbert Xu crypto_free_ahash(hash_tfm); 448b95bf2d3SMilan Broz kfree(salt); 4495861f1beSMilan Broz return err; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4522dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 4532dc5327dSMilan Broz struct dm_crypt_request *dmreq) 4541da177e4SLinus Torvalds { 455fd2d231fSMikulas Patocka struct crypto_cipher *essiv_tfm = cc->iv_private; 456c0297721SAndi Kleen 4571da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 458283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 459c0297721SAndi Kleen crypto_cipher_encrypt_one(essiv_tfm, iv, iv); 460c0297721SAndi Kleen 4611da177e4SLinus Torvalds return 0; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 46448527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 46548527fa7SRik Snel const char *opts) 46648527fa7SRik Snel { 467bbdb23b5SHerbert Xu unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); 468f0d1b0b3SDavid Howells int log = ilog2(bs); 46948527fa7SRik Snel 47048527fa7SRik Snel /* we need to calculate how far we must shift the sector count 47148527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 47248527fa7SRik Snel 47348527fa7SRik Snel if (1 << log != bs) { 47448527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 47548527fa7SRik Snel return -EINVAL; 47648527fa7SRik Snel } 47748527fa7SRik Snel 47848527fa7SRik Snel if (log > 9) { 47948527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 48048527fa7SRik Snel return -EINVAL; 48148527fa7SRik Snel } 48248527fa7SRik Snel 48360473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 48448527fa7SRik Snel 48548527fa7SRik Snel return 0; 48648527fa7SRik Snel } 48748527fa7SRik Snel 48848527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 48948527fa7SRik Snel { 49048527fa7SRik Snel } 49148527fa7SRik Snel 4922dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 4932dc5327dSMilan Broz struct dm_crypt_request *dmreq) 49448527fa7SRik Snel { 49579066ad3SHerbert Xu __be64 val; 49679066ad3SHerbert Xu 49748527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 49879066ad3SHerbert Xu 4992dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 50079066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 50148527fa7SRik Snel 5021da177e4SLinus Torvalds return 0; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5052dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 5062dc5327dSMilan Broz struct dm_crypt_request *dmreq) 50746b47730SLudwig Nussel { 50846b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 50946b47730SLudwig Nussel 51046b47730SLudwig Nussel return 0; 51146b47730SLudwig Nussel } 51246b47730SLudwig Nussel 51334745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 51434745785SMilan Broz { 51534745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 51634745785SMilan Broz 51734745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 51834745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 51934745785SMilan Broz lmk->hash_tfm = NULL; 52034745785SMilan Broz 52134745785SMilan Broz kzfree(lmk->seed); 52234745785SMilan Broz lmk->seed = NULL; 52334745785SMilan Broz } 52434745785SMilan Broz 52534745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 52634745785SMilan Broz const char *opts) 52734745785SMilan Broz { 52834745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 52934745785SMilan Broz 5308f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 5318f0009a2SMilan Broz ti->error = "Unsupported sector size for LMK"; 5328f0009a2SMilan Broz return -EINVAL; 5338f0009a2SMilan Broz } 5348f0009a2SMilan Broz 53534745785SMilan Broz lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); 53634745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 53734745785SMilan Broz ti->error = "Error initializing LMK hash"; 53834745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 53934745785SMilan Broz } 54034745785SMilan Broz 54134745785SMilan Broz /* No seed in LMK version 2 */ 54234745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 54334745785SMilan Broz lmk->seed = NULL; 54434745785SMilan Broz return 0; 54534745785SMilan Broz } 54634745785SMilan Broz 54734745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 54834745785SMilan Broz if (!lmk->seed) { 54934745785SMilan Broz crypt_iv_lmk_dtr(cc); 55034745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 55134745785SMilan Broz return -ENOMEM; 55234745785SMilan Broz } 55334745785SMilan Broz 55434745785SMilan Broz return 0; 55534745785SMilan Broz } 55634745785SMilan Broz 55734745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 55834745785SMilan Broz { 55934745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 56034745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 56134745785SMilan Broz 56234745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 56334745785SMilan Broz if (lmk->seed) 56434745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 56534745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 56634745785SMilan Broz 56734745785SMilan Broz return 0; 56834745785SMilan Broz } 56934745785SMilan Broz 57034745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 57134745785SMilan Broz { 57234745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 57334745785SMilan Broz 57434745785SMilan Broz if (lmk->seed) 57534745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 57634745785SMilan Broz 57734745785SMilan Broz return 0; 57834745785SMilan Broz } 57934745785SMilan Broz 58034745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 58134745785SMilan Broz struct dm_crypt_request *dmreq, 58234745785SMilan Broz u8 *data) 58334745785SMilan Broz { 58434745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 585b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 58634745785SMilan Broz struct md5_state md5state; 587da31a078SMilan Broz __le32 buf[4]; 58834745785SMilan Broz int i, r; 58934745785SMilan Broz 590b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 591b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 59234745785SMilan Broz 593b6106265SJan-Simon Möller r = crypto_shash_init(desc); 59434745785SMilan Broz if (r) 59534745785SMilan Broz return r; 59634745785SMilan Broz 59734745785SMilan Broz if (lmk->seed) { 598b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 59934745785SMilan Broz if (r) 60034745785SMilan Broz return r; 60134745785SMilan Broz } 60234745785SMilan Broz 60334745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 604b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 60534745785SMilan Broz if (r) 60634745785SMilan Broz return r; 60734745785SMilan Broz 60834745785SMilan Broz /* Sector is cropped to 56 bits here */ 60934745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 61034745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 61134745785SMilan Broz buf[2] = cpu_to_le32(4024); 61234745785SMilan Broz buf[3] = 0; 613b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 61434745785SMilan Broz if (r) 61534745785SMilan Broz return r; 61634745785SMilan Broz 61734745785SMilan Broz /* No MD5 padding here */ 618b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 61934745785SMilan Broz if (r) 62034745785SMilan Broz return r; 62134745785SMilan Broz 62234745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 62334745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 62434745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 62534745785SMilan Broz 62634745785SMilan Broz return 0; 62734745785SMilan Broz } 62834745785SMilan Broz 62934745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 63034745785SMilan Broz struct dm_crypt_request *dmreq) 63134745785SMilan Broz { 632ef43aa38SMilan Broz struct scatterlist *sg; 63334745785SMilan Broz u8 *src; 63434745785SMilan Broz int r = 0; 63534745785SMilan Broz 63634745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 637ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 638ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 639ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 640c2e022cbSCong Wang kunmap_atomic(src); 64134745785SMilan Broz } else 64234745785SMilan Broz memset(iv, 0, cc->iv_size); 64334745785SMilan Broz 64434745785SMilan Broz return r; 64534745785SMilan Broz } 64634745785SMilan Broz 64734745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 64834745785SMilan Broz struct dm_crypt_request *dmreq) 64934745785SMilan Broz { 650ef43aa38SMilan Broz struct scatterlist *sg; 65134745785SMilan Broz u8 *dst; 65234745785SMilan Broz int r; 65334745785SMilan Broz 65434745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 65534745785SMilan Broz return 0; 65634745785SMilan Broz 657ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 658ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 659ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 66034745785SMilan Broz 66134745785SMilan Broz /* Tweak the first block of plaintext sector */ 66234745785SMilan Broz if (!r) 663ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 66434745785SMilan Broz 665c2e022cbSCong Wang kunmap_atomic(dst); 66634745785SMilan Broz return r; 66734745785SMilan Broz } 66834745785SMilan Broz 669ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 670ed04d981SMilan Broz { 671ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 672ed04d981SMilan Broz 673ed04d981SMilan Broz kzfree(tcw->iv_seed); 674ed04d981SMilan Broz tcw->iv_seed = NULL; 675ed04d981SMilan Broz kzfree(tcw->whitening); 676ed04d981SMilan Broz tcw->whitening = NULL; 677ed04d981SMilan Broz 678ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 679ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 680ed04d981SMilan Broz tcw->crc32_tfm = NULL; 681ed04d981SMilan Broz } 682ed04d981SMilan Broz 683ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 684ed04d981SMilan Broz const char *opts) 685ed04d981SMilan Broz { 686ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 687ed04d981SMilan Broz 6888f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 6898f0009a2SMilan Broz ti->error = "Unsupported sector size for TCW"; 6908f0009a2SMilan Broz return -EINVAL; 6918f0009a2SMilan Broz } 6928f0009a2SMilan Broz 693ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 694ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 695ed04d981SMilan Broz return -EINVAL; 696ed04d981SMilan Broz } 697ed04d981SMilan Broz 698ed04d981SMilan Broz tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); 699ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 700ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 701ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 702ed04d981SMilan Broz } 703ed04d981SMilan Broz 704ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 705ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 706ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 707ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 708ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 709ed04d981SMilan Broz return -ENOMEM; 710ed04d981SMilan Broz } 711ed04d981SMilan Broz 712ed04d981SMilan Broz return 0; 713ed04d981SMilan Broz } 714ed04d981SMilan Broz 715ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 716ed04d981SMilan Broz { 717ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 718ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 719ed04d981SMilan Broz 720ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 721ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 722ed04d981SMilan Broz TCW_WHITENING_SIZE); 723ed04d981SMilan Broz 724ed04d981SMilan Broz return 0; 725ed04d981SMilan Broz } 726ed04d981SMilan Broz 727ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 728ed04d981SMilan Broz { 729ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 730ed04d981SMilan Broz 731ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 732ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 733ed04d981SMilan Broz 734ed04d981SMilan Broz return 0; 735ed04d981SMilan Broz } 736ed04d981SMilan Broz 737ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 738ed04d981SMilan Broz struct dm_crypt_request *dmreq, 739ed04d981SMilan Broz u8 *data) 740ed04d981SMilan Broz { 741ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 742350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 743ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 744b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 745ed04d981SMilan Broz int i, r; 746ed04d981SMilan Broz 747ed04d981SMilan Broz /* xor whitening with sector number */ 748ed04d981SMilan Broz memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); 749ed04d981SMilan Broz crypto_xor(buf, (u8 *)§or, 8); 750ed04d981SMilan Broz crypto_xor(&buf[8], (u8 *)§or, 8); 751ed04d981SMilan Broz 752ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 753b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 754b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 755ed04d981SMilan Broz for (i = 0; i < 4; i++) { 756b6106265SJan-Simon Möller r = crypto_shash_init(desc); 757ed04d981SMilan Broz if (r) 758ed04d981SMilan Broz goto out; 759b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 760ed04d981SMilan Broz if (r) 761ed04d981SMilan Broz goto out; 762b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 763ed04d981SMilan Broz if (r) 764ed04d981SMilan Broz goto out; 765ed04d981SMilan Broz } 766ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 767ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 768ed04d981SMilan Broz 769ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 770ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 771ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 772ed04d981SMilan Broz out: 7731a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 774ed04d981SMilan Broz return r; 775ed04d981SMilan Broz } 776ed04d981SMilan Broz 777ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 778ed04d981SMilan Broz struct dm_crypt_request *dmreq) 779ed04d981SMilan Broz { 780ef43aa38SMilan Broz struct scatterlist *sg; 781ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 782350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 783ed04d981SMilan Broz u8 *src; 784ed04d981SMilan Broz int r = 0; 785ed04d981SMilan Broz 786ed04d981SMilan Broz /* Remove whitening from ciphertext */ 787ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 788ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 789ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 790ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 791ed04d981SMilan Broz kunmap_atomic(src); 792ed04d981SMilan Broz } 793ed04d981SMilan Broz 794ed04d981SMilan Broz /* Calculate IV */ 795ed04d981SMilan Broz memcpy(iv, tcw->iv_seed, cc->iv_size); 796ed04d981SMilan Broz crypto_xor(iv, (u8 *)§or, 8); 797ed04d981SMilan Broz if (cc->iv_size > 8) 798ed04d981SMilan Broz crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); 799ed04d981SMilan Broz 800ed04d981SMilan Broz return r; 801ed04d981SMilan Broz } 802ed04d981SMilan Broz 803ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 804ed04d981SMilan Broz struct dm_crypt_request *dmreq) 805ed04d981SMilan Broz { 806ef43aa38SMilan Broz struct scatterlist *sg; 807ed04d981SMilan Broz u8 *dst; 808ed04d981SMilan Broz int r; 809ed04d981SMilan Broz 810ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 811ed04d981SMilan Broz return 0; 812ed04d981SMilan Broz 813ed04d981SMilan Broz /* Apply whitening on ciphertext */ 814ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 815ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 816ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 817ed04d981SMilan Broz kunmap_atomic(dst); 818ed04d981SMilan Broz 819ed04d981SMilan Broz return r; 820ed04d981SMilan Broz } 821ed04d981SMilan Broz 822ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 823ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 824ef43aa38SMilan Broz { 825ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 826ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 827ef43aa38SMilan Broz return 0; 828ef43aa38SMilan Broz } 829ef43aa38SMilan Broz 8301b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 8311da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 8321da177e4SLinus Torvalds }; 8331da177e4SLinus Torvalds 8341b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 83561afef61SMilan Broz .generator = crypt_iv_plain64_gen 83661afef61SMilan Broz }; 83761afef61SMilan Broz 8381b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 8391da177e4SLinus Torvalds .ctr = crypt_iv_essiv_ctr, 8401da177e4SLinus Torvalds .dtr = crypt_iv_essiv_dtr, 841b95bf2d3SMilan Broz .init = crypt_iv_essiv_init, 842542da317SMilan Broz .wipe = crypt_iv_essiv_wipe, 8431da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 8441da177e4SLinus Torvalds }; 8451da177e4SLinus Torvalds 8461b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 84748527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 84848527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 84948527fa7SRik Snel .generator = crypt_iv_benbi_gen 85048527fa7SRik Snel }; 8511da177e4SLinus Torvalds 8521b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 85346b47730SLudwig Nussel .generator = crypt_iv_null_gen 85446b47730SLudwig Nussel }; 85546b47730SLudwig Nussel 8561b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 85734745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 85834745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 85934745785SMilan Broz .init = crypt_iv_lmk_init, 86034745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 86134745785SMilan Broz .generator = crypt_iv_lmk_gen, 86234745785SMilan Broz .post = crypt_iv_lmk_post 86334745785SMilan Broz }; 86434745785SMilan Broz 8651b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 866ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 867ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 868ed04d981SMilan Broz .init = crypt_iv_tcw_init, 869ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 870ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 871ed04d981SMilan Broz .post = crypt_iv_tcw_post 872ed04d981SMilan Broz }; 873ed04d981SMilan Broz 874ef43aa38SMilan Broz static struct crypt_iv_operations crypt_iv_random_ops = { 875ef43aa38SMilan Broz .generator = crypt_iv_random_gen 876ef43aa38SMilan Broz }; 877ef43aa38SMilan Broz 878ef43aa38SMilan Broz /* 879ef43aa38SMilan Broz * Integrity extensions 880ef43aa38SMilan Broz */ 881ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 882ef43aa38SMilan Broz { 883ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 884ef43aa38SMilan Broz } 885ef43aa38SMilan Broz 886ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 887ef43aa38SMilan Broz { 88833d2f09fSMilan Broz return crypt_integrity_aead(cc) && cc->key_mac_size; 889ef43aa38SMilan Broz } 890ef43aa38SMilan Broz 891ef43aa38SMilan Broz /* Get sg containing data */ 892ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 893ef43aa38SMilan Broz struct scatterlist *sg) 894ef43aa38SMilan Broz { 89533d2f09fSMilan Broz if (unlikely(crypt_integrity_aead(cc))) 896ef43aa38SMilan Broz return &sg[2]; 897ef43aa38SMilan Broz 898ef43aa38SMilan Broz return sg; 899ef43aa38SMilan Broz } 900ef43aa38SMilan Broz 901ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 902ef43aa38SMilan Broz { 903ef43aa38SMilan Broz struct bio_integrity_payload *bip; 904ef43aa38SMilan Broz unsigned int tag_len; 905ef43aa38SMilan Broz int ret; 906ef43aa38SMilan Broz 907ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 908ef43aa38SMilan Broz return 0; 909ef43aa38SMilan Broz 910ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 911ef43aa38SMilan Broz if (IS_ERR(bip)) 912ef43aa38SMilan Broz return PTR_ERR(bip); 913ef43aa38SMilan Broz 914ef43aa38SMilan Broz tag_len = io->cc->on_disk_tag_size * bio_sectors(bio); 915ef43aa38SMilan Broz 916ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 917ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 918ef43aa38SMilan Broz 919ef43aa38SMilan Broz /* We own the metadata, do not let bio_free to release it */ 920ef43aa38SMilan Broz bip->bip_flags &= ~BIP_BLOCK_INTEGRITY; 921ef43aa38SMilan Broz 922ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 923ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 924ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 925ef43aa38SMilan Broz return -ENOMEM; 926ef43aa38SMilan Broz 927ef43aa38SMilan Broz return 0; 928ef43aa38SMilan Broz } 929ef43aa38SMilan Broz 930ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 931ef43aa38SMilan Broz { 932ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 933ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 934ef43aa38SMilan Broz 935ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 936ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 937ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 938ef43aa38SMilan Broz return -EINVAL; 939ef43aa38SMilan Broz } 940ef43aa38SMilan Broz 941583fe747SMikulas Patocka if (bi->tag_size != cc->on_disk_tag_size || 942583fe747SMikulas Patocka bi->tuple_size != cc->on_disk_tag_size) { 943ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 944ef43aa38SMilan Broz return -EINVAL; 945ef43aa38SMilan Broz } 946583fe747SMikulas Patocka if (1 << bi->interval_exp != cc->sector_size) { 947583fe747SMikulas Patocka ti->error = "Integrity profile sector size mismatch."; 948583fe747SMikulas Patocka return -EINVAL; 949583fe747SMikulas Patocka } 950ef43aa38SMilan Broz 95133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 952ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 953ef43aa38SMilan Broz DMINFO("Integrity AEAD, tag size %u, IV size %u.", 954ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 955ef43aa38SMilan Broz 956ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 957ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 958ef43aa38SMilan Broz return -EINVAL; 959ef43aa38SMilan Broz } 960ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 961ef43aa38SMilan Broz DMINFO("Additional per-sector space %u bytes for IV.", 962ef43aa38SMilan Broz cc->integrity_iv_size); 963ef43aa38SMilan Broz 964ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 965ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 966ef43aa38SMilan Broz return -EINVAL; 967ef43aa38SMilan Broz } 968ef43aa38SMilan Broz 969ef43aa38SMilan Broz return 0; 970ef43aa38SMilan Broz #else 971ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 972ef43aa38SMilan Broz return -EINVAL; 973ef43aa38SMilan Broz #endif 974ef43aa38SMilan Broz } 975ef43aa38SMilan Broz 976d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 977d469f841SMilan Broz struct convert_context *ctx, 9781da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 979fcd369daSMilan Broz sector_t sector) 9801da177e4SLinus Torvalds { 9811da177e4SLinus Torvalds ctx->bio_in = bio_in; 9821da177e4SLinus Torvalds ctx->bio_out = bio_out; 983003b5c57SKent Overstreet if (bio_in) 984003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 985003b5c57SKent Overstreet if (bio_out) 986003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 987c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 98843d69034SMilan Broz init_completion(&ctx->restart); 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 991b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 992ef43aa38SMilan Broz void *req) 993b2174eebSHuang Ying { 994b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 995b2174eebSHuang Ying } 996b2174eebSHuang Ying 997ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 998b2174eebSHuang Ying { 999ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 1000b2174eebSHuang Ying } 1001b2174eebSHuang Ying 10022dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 10032dc5327dSMilan Broz struct dm_crypt_request *dmreq) 10042dc5327dSMilan Broz { 100533d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1006ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1007ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1008ef43aa38SMilan Broz else 10092dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1010bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 10112dc5327dSMilan Broz } 10122dc5327dSMilan Broz 1013ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1014ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1015ef43aa38SMilan Broz { 1016ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1017ef43aa38SMilan Broz } 1018ef43aa38SMilan Broz 1019ef43aa38SMilan Broz static uint64_t *org_sector_of_dmreq(struct crypt_config *cc, 1020ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1021ef43aa38SMilan Broz { 1022ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1023ef43aa38SMilan Broz return (uint64_t*) ptr; 1024ef43aa38SMilan Broz } 1025ef43aa38SMilan Broz 1026ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1027ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1028ef43aa38SMilan Broz { 1029ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1030ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1031ef43aa38SMilan Broz return (unsigned int*)ptr; 1032ef43aa38SMilan Broz } 1033ef43aa38SMilan Broz 1034ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1035ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1036ef43aa38SMilan Broz { 1037ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1038ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1039ef43aa38SMilan Broz 1040ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1041ef43aa38SMilan Broz cc->on_disk_tag_size]; 1042ef43aa38SMilan Broz } 1043ef43aa38SMilan Broz 1044ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1045ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1046ef43aa38SMilan Broz { 1047ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1048ef43aa38SMilan Broz } 1049ef43aa38SMilan Broz 1050ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 10513a7f6c99SMilan Broz struct convert_context *ctx, 1052ef43aa38SMilan Broz struct aead_request *req, 1053ef43aa38SMilan Broz unsigned int tag_offset) 105401482b76SMilan Broz { 1055003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1056003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 10573a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1058ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1059ef43aa38SMilan Broz uint64_t *sector; 1060ef43aa38SMilan Broz int r = 0; 1061ef43aa38SMilan Broz 1062ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 106301482b76SMilan Broz 10648f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 10658f0009a2SMilan Broz if (unlikely(bv_in.bv_offset & (cc->sector_size - 1))) 10668f0009a2SMilan Broz return -EIO; 10678f0009a2SMilan Broz 1068b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1069c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 10708f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1071ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1072b2174eebSHuang Ying dmreq->ctx = ctx; 107301482b76SMilan Broz 1074ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 107501482b76SMilan Broz 1076ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1077ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1078ef43aa38SMilan Broz 1079ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1080ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1081ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1082ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1083ef43aa38SMilan Broz 1084ef43aa38SMilan Broz /* AEAD request: 1085ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1086ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1087ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1088ef43aa38SMilan Broz */ 1089ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1090ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1091ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 10928f0009a2SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1093ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1094ef43aa38SMilan Broz 1095ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1096ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1097ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 10988f0009a2SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1099ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 110001482b76SMilan Broz 11013a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1102ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1103ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1104ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1105ef43aa38SMilan Broz } else { 1106ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 11073a7f6c99SMilan Broz if (r < 0) 11083a7f6c99SMilan Broz return r; 1109ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1110ef43aa38SMilan Broz if (cc->integrity_iv_size) 1111ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1112ef43aa38SMilan Broz } 1113ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1114ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1115ef43aa38SMilan Broz } 1116ef43aa38SMilan Broz 1117ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1118ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1119ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 11208f0009a2SMilan Broz cc->sector_size, iv); 1121ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1122ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1123ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1124ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1125ef43aa38SMilan Broz } else { 1126ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 11278f0009a2SMilan Broz cc->sector_size + cc->integrity_tag_size, iv); 1128ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1129ef43aa38SMilan Broz } 1130ef43aa38SMilan Broz 1131ef43aa38SMilan Broz if (r == -EBADMSG) 1132ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1133ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*sector)); 1134ef43aa38SMilan Broz 1135ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1136ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1137ef43aa38SMilan Broz 11388f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 11398f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1140ef43aa38SMilan Broz 1141ef43aa38SMilan Broz return r; 11423a7f6c99SMilan Broz } 11433a7f6c99SMilan Broz 1144ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1145ef43aa38SMilan Broz struct convert_context *ctx, 1146ef43aa38SMilan Broz struct skcipher_request *req, 1147ef43aa38SMilan Broz unsigned int tag_offset) 1148ef43aa38SMilan Broz { 1149ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1150ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1151ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1152ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1153ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1154ef43aa38SMilan Broz uint64_t *sector; 1155ef43aa38SMilan Broz int r = 0; 1156ef43aa38SMilan Broz 11578f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 11588f0009a2SMilan Broz if (unlikely(bv_in.bv_offset & (cc->sector_size - 1))) 11598f0009a2SMilan Broz return -EIO; 11608f0009a2SMilan Broz 1161ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1162ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 11638f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1164ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1165ef43aa38SMilan Broz dmreq->ctx = ctx; 1166ef43aa38SMilan Broz 1167ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1168ef43aa38SMilan Broz 1169ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1170ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1171ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1172ef43aa38SMilan Broz 1173ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1174ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1175ef43aa38SMilan Broz 1176ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1177ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1178ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1179ef43aa38SMilan Broz 1180ef43aa38SMilan Broz sg_init_table(sg_in, 1); 11818f0009a2SMilan Broz sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1182ef43aa38SMilan Broz 1183ef43aa38SMilan Broz sg_init_table(sg_out, 1); 11848f0009a2SMilan Broz sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1185ef43aa38SMilan Broz 1186ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1187ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1188ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1189ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1190ef43aa38SMilan Broz } else { 1191ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1192ef43aa38SMilan Broz if (r < 0) 1193ef43aa38SMilan Broz return r; 1194ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1195ef43aa38SMilan Broz if (cc->integrity_iv_size) 1196ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1197ef43aa38SMilan Broz } 1198ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1199ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1200ef43aa38SMilan Broz } 1201ef43aa38SMilan Broz 12028f0009a2SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 12033a7f6c99SMilan Broz 12043a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1205bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 12063a7f6c99SMilan Broz else 1207bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 12083a7f6c99SMilan Broz 12092dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1210ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1211ef43aa38SMilan Broz 12128f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 12138f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 12142dc5327dSMilan Broz 12153a7f6c99SMilan Broz return r; 121601482b76SMilan Broz } 121701482b76SMilan Broz 121895497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 121995497a96SMilan Broz int error); 1220c0297721SAndi Kleen 1221ef43aa38SMilan Broz static void crypt_alloc_req_skcipher(struct crypt_config *cc, 1222ddd42edfSMilan Broz struct convert_context *ctx) 1223ddd42edfSMilan Broz { 1224c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1225c0297721SAndi Kleen 1226ef43aa38SMilan Broz if (!ctx->r.req) 1227ef43aa38SMilan Broz ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO); 1228c0297721SAndi Kleen 1229ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 123054cea3f6SMilan Broz 123154cea3f6SMilan Broz /* 123254cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 123354cea3f6SMilan Broz * requests if driver request queue is full. 123454cea3f6SMilan Broz */ 1235ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1236c0297721SAndi Kleen CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1237ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1238ddd42edfSMilan Broz } 1239ddd42edfSMilan Broz 1240ef43aa38SMilan Broz static void crypt_alloc_req_aead(struct crypt_config *cc, 1241ef43aa38SMilan Broz struct convert_context *ctx) 1242ef43aa38SMilan Broz { 1243ef43aa38SMilan Broz if (!ctx->r.req_aead) 1244ef43aa38SMilan Broz ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO); 1245ef43aa38SMilan Broz 1246ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1247ef43aa38SMilan Broz 1248ef43aa38SMilan Broz /* 1249ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1250ef43aa38SMilan Broz * requests if driver request queue is full. 1251ef43aa38SMilan Broz */ 1252ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1253ef43aa38SMilan Broz CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1254ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1255ef43aa38SMilan Broz } 1256ef43aa38SMilan Broz 1257ef43aa38SMilan Broz static void crypt_alloc_req(struct crypt_config *cc, 1258ef43aa38SMilan Broz struct convert_context *ctx) 1259ef43aa38SMilan Broz { 126033d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1261ef43aa38SMilan Broz crypt_alloc_req_aead(cc, ctx); 1262ef43aa38SMilan Broz else 1263ef43aa38SMilan Broz crypt_alloc_req_skcipher(cc, ctx); 1264ef43aa38SMilan Broz } 1265ef43aa38SMilan Broz 1266ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1267bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1268298a9fa0SMikulas Patocka { 1269298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1270298a9fa0SMikulas Patocka 1271bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 1272298a9fa0SMikulas Patocka mempool_free(req, cc->req_pool); 1273298a9fa0SMikulas Patocka } 1274298a9fa0SMikulas Patocka 1275ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1276ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1277ef43aa38SMilan Broz { 1278ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1279ef43aa38SMilan Broz 1280ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 1281ef43aa38SMilan Broz mempool_free(req, cc->req_pool); 1282ef43aa38SMilan Broz } 1283ef43aa38SMilan Broz 1284ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1285ef43aa38SMilan Broz { 128633d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1287ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1288ef43aa38SMilan Broz else 1289ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1290ef43aa38SMilan Broz } 1291ef43aa38SMilan Broz 12921da177e4SLinus Torvalds /* 12931da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 12941da177e4SLinus Torvalds */ 12951da177e4SLinus Torvalds static int crypt_convert(struct crypt_config *cc, 12961da177e4SLinus Torvalds struct convert_context *ctx) 12971da177e4SLinus Torvalds { 1298ef43aa38SMilan Broz unsigned int tag_offset = 0; 1299ff3af92bSMikulas Patocka unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 13003f1e9070SMilan Broz int r; 13011da177e4SLinus Torvalds 130240b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1303c8081618SMilan Broz 1304003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 13051da177e4SLinus Torvalds 13063a7f6c99SMilan Broz crypt_alloc_req(cc, ctx); 130740b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 13083f1e9070SMilan Broz 130933d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1310ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1311ef43aa38SMilan Broz else 1312ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 13133a7f6c99SMilan Broz 13143a7f6c99SMilan Broz switch (r) { 131554cea3f6SMilan Broz /* 131654cea3f6SMilan Broz * The request was queued by a crypto driver 131754cea3f6SMilan Broz * but the driver request queue is full, let's wait. 131854cea3f6SMilan Broz */ 13193a7f6c99SMilan Broz case -EBUSY: 13203a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 132116735d02SWolfram Sang reinit_completion(&ctx->restart); 1322c0403ec0SRabin Vincent /* fall through */ 132354cea3f6SMilan Broz /* 132454cea3f6SMilan Broz * The request is queued and processed asynchronously, 132554cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 132654cea3f6SMilan Broz */ 1327c0403ec0SRabin Vincent case -EINPROGRESS: 1328ef43aa38SMilan Broz ctx->r.req = NULL; 13298f0009a2SMilan Broz ctx->cc_sector += sector_step; 1330583fe747SMikulas Patocka tag_offset++; 13313a7f6c99SMilan Broz continue; 133254cea3f6SMilan Broz /* 133354cea3f6SMilan Broz * The request was already processed (synchronously). 133454cea3f6SMilan Broz */ 13353f1e9070SMilan Broz case 0: 133640b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 13378f0009a2SMilan Broz ctx->cc_sector += sector_step; 1338583fe747SMikulas Patocka tag_offset++; 1339c7f1b204SMilan Broz cond_resched(); 13403f1e9070SMilan Broz continue; 1341ef43aa38SMilan Broz /* 1342ef43aa38SMilan Broz * There was a data integrity error. 1343ef43aa38SMilan Broz */ 1344ef43aa38SMilan Broz case -EBADMSG: 1345ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 1346ef43aa38SMilan Broz return -EILSEQ; 1347ef43aa38SMilan Broz /* 1348ef43aa38SMilan Broz * There was an error while processing the request. 1349ef43aa38SMilan Broz */ 13503f1e9070SMilan Broz default: 135140b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 1352ef43aa38SMilan Broz return -EIO; 13531da177e4SLinus Torvalds } 13543f1e9070SMilan Broz } 13553f1e9070SMilan Broz 13563f1e9070SMilan Broz return 0; 13573f1e9070SMilan Broz } 13581da177e4SLinus Torvalds 1359cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1360cf2f1abfSMikulas Patocka 13611da177e4SLinus Torvalds /* 13621da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1363586b286bSMike Snitzer * This should never violate the device limitations (but only because 1364586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 13657145c241SMikulas Patocka * 13667145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 13677145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 13687145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 13697145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 13707145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 13717145c241SMikulas Patocka * 13727145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 13737145c241SMikulas Patocka * 13747145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 13757145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 13767145c241SMikulas Patocka * to blocking allocations with a mutex. 13771da177e4SLinus Torvalds */ 1378cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 13791da177e4SLinus Torvalds { 138049a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 13818b004457SMilan Broz struct bio *clone; 13821da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 13837145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 13847145c241SMikulas Patocka unsigned i, len, remaining_size; 138591e10625SMilan Broz struct page *page; 13861da177e4SLinus Torvalds 13877145c241SMikulas Patocka retry: 1388d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 13897145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 13907145c241SMikulas Patocka 13916a24c718SMilan Broz clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); 13928b004457SMilan Broz if (!clone) 1393ef43aa38SMilan Broz goto out; 13941da177e4SLinus Torvalds 1395027581f3SOlaf Kirch clone_init(io, clone); 13966a24c718SMilan Broz 13977145c241SMikulas Patocka remaining_size = size; 13987145c241SMikulas Patocka 1399f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 140091e10625SMilan Broz page = mempool_alloc(cc->page_pool, gfp_mask); 14017145c241SMikulas Patocka if (!page) { 14027145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 14037145c241SMikulas Patocka bio_put(clone); 1404d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 14057145c241SMikulas Patocka goto retry; 14067145c241SMikulas Patocka } 14071da177e4SLinus Torvalds 14087145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 14091da177e4SLinus Torvalds 14100dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 141191e10625SMilan Broz 14127145c241SMikulas Patocka remaining_size -= len; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 1415ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1416ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1417ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1418ef43aa38SMilan Broz bio_put(clone); 1419ef43aa38SMilan Broz clone = NULL; 1420ef43aa38SMilan Broz } 1421ef43aa38SMilan Broz out: 1422d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 14237145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 14247145c241SMikulas Patocka 14258b004457SMilan Broz return clone; 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds 1428644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 14291da177e4SLinus Torvalds { 1430644bd2f0SNeil Brown unsigned int i; 14311da177e4SLinus Torvalds struct bio_vec *bv; 14321da177e4SLinus Torvalds 1433cb34e057SKent Overstreet bio_for_each_segment_all(bv, clone, i) { 14341da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 14351da177e4SLinus Torvalds mempool_free(bv->bv_page, cc->page_pool); 14361da177e4SLinus Torvalds bv->bv_page = NULL; 14371da177e4SLinus Torvalds } 14381da177e4SLinus Torvalds } 14391da177e4SLinus Torvalds 1440298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1441dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1442dc440d1eSMilan Broz { 144349a8a920SAlasdair G Kergon io->cc = cc; 1444dc440d1eSMilan Broz io->base_bio = bio; 1445dc440d1eSMilan Broz io->sector = sector; 1446dc440d1eSMilan Broz io->error = 0; 1447ef43aa38SMilan Broz io->ctx.r.req = NULL; 1448ef43aa38SMilan Broz io->integrity_metadata = NULL; 1449ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 145040b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1451dc440d1eSMilan Broz } 1452dc440d1eSMilan Broz 14533e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 14543e1a8bddSMilan Broz { 145540b6229bSMikulas Patocka atomic_inc(&io->io_pending); 14563e1a8bddSMilan Broz } 14573e1a8bddSMilan Broz 14581da177e4SLinus Torvalds /* 14591da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 14601da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 14611da177e4SLinus Torvalds */ 14625742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 14631da177e4SLinus Torvalds { 146449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1465b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 1466b35f8caaSMilan Broz int error = io->error; 14671da177e4SLinus Torvalds 146840b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 14691da177e4SLinus Torvalds return; 14701da177e4SLinus Torvalds 1471ef43aa38SMilan Broz if (io->ctx.r.req) 1472ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1473ef43aa38SMilan Broz 1474ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 1475ef43aa38SMilan Broz mempool_free(io->integrity_metadata, io->cc->tag_pool); 1476ef43aa38SMilan Broz else 1477ef43aa38SMilan Broz kfree(io->integrity_metadata); 1478b35f8caaSMilan Broz 14794246a0b6SChristoph Hellwig base_bio->bi_error = error; 14804246a0b6SChristoph Hellwig bio_endio(base_bio); 14811da177e4SLinus Torvalds } 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds /* 1484cabf08e4SMilan Broz * kcryptd/kcryptd_io: 14851da177e4SLinus Torvalds * 14861da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 148723541d2dSMilan Broz * interrupt context. 1488cabf08e4SMilan Broz * 1489cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1490cabf08e4SMilan Broz * 1491cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1492cabf08e4SMilan Broz * 1493cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1494cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1495cabf08e4SMilan Broz * to memory allocation. 1496c0297721SAndi Kleen * 1497c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1498c0297721SAndi Kleen * They should not depend on each other and do not block. 14991da177e4SLinus Torvalds */ 15004246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 15018b004457SMilan Broz { 1502028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 150349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1504ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 15059b81c842SSasha Levin int error; 15068b004457SMilan Broz 15078b004457SMilan Broz /* 15086712ecf8SNeilBrown * free the processed pages 15098b004457SMilan Broz */ 1510ee7a491eSMilan Broz if (rw == WRITE) 1511644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 15128b004457SMilan Broz 15139b81c842SSasha Levin error = clone->bi_error; 15148b004457SMilan Broz bio_put(clone); 1515ee7a491eSMilan Broz 15169b81c842SSasha Levin if (rw == READ && !error) { 1517cabf08e4SMilan Broz kcryptd_queue_crypt(io); 15186712ecf8SNeilBrown return; 1519ee7a491eSMilan Broz } 15205742fd77SMilan Broz 15219b81c842SSasha Levin if (unlikely(error)) 15229b81c842SSasha Levin io->error = error; 15235742fd77SMilan Broz 15245742fd77SMilan Broz crypt_dec_pending(io); 15258b004457SMilan Broz } 15268b004457SMilan Broz 1527028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 15288b004457SMilan Broz { 152949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15308b004457SMilan Broz 15318b004457SMilan Broz clone->bi_private = io; 15328b004457SMilan Broz clone->bi_end_io = crypt_endio; 15338b004457SMilan Broz clone->bi_bdev = cc->dev->bdev; 1534ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 15358b004457SMilan Broz } 15368b004457SMilan Broz 153720c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 15388b004457SMilan Broz { 153949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15408b004457SMilan Broz struct bio *clone; 154193e605c2SMilan Broz 15428b004457SMilan Broz /* 154359779079SMike Snitzer * We need the original biovec array in order to decrypt 154459779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 154559779079SMike Snitzer * biovecs we don't need to worry about the block layer 154659779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 15478b004457SMilan Broz */ 154859779079SMike Snitzer clone = bio_clone_fast(io->base_bio, gfp, cc->bs); 15497eaceaccSJens Axboe if (!clone) 155020c82538SMilan Broz return 1; 15518b004457SMilan Broz 155220c82538SMilan Broz crypt_inc_pending(io); 155320c82538SMilan Broz 15548b004457SMilan Broz clone_init(io, clone); 15554f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 15568b004457SMilan Broz 1557ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1558ef43aa38SMilan Broz crypt_dec_pending(io); 1559ef43aa38SMilan Broz bio_put(clone); 1560ef43aa38SMilan Broz return 1; 1561ef43aa38SMilan Broz } 1562ef43aa38SMilan Broz 156393e605c2SMilan Broz generic_make_request(clone); 156420c82538SMilan Broz return 0; 15658b004457SMilan Broz } 15668b004457SMilan Broz 1567dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1568395b167cSAlasdair G Kergon { 1569395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1570395b167cSAlasdair G Kergon 157120c82538SMilan Broz crypt_inc_pending(io); 157220c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 157320c82538SMilan Broz io->error = -ENOMEM; 157420c82538SMilan Broz crypt_dec_pending(io); 1575395b167cSAlasdair G Kergon } 1576395b167cSAlasdair G Kergon 1577dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1578395b167cSAlasdair G Kergon { 157949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1580395b167cSAlasdair G Kergon 1581dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1582395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1583395b167cSAlasdair G Kergon } 1584395b167cSAlasdair G Kergon 1585dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1586dc267621SMikulas Patocka { 1587dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1588dc267621SMikulas Patocka 1589dc267621SMikulas Patocka generic_make_request(clone); 1590dc267621SMikulas Patocka } 1591dc267621SMikulas Patocka 1592b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1593b3c5fd30SMikulas Patocka 1594dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1595dc267621SMikulas Patocka { 1596dc267621SMikulas Patocka struct crypt_config *cc = data; 1597b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1598b3c5fd30SMikulas Patocka 1599dc267621SMikulas Patocka while (1) { 1600b3c5fd30SMikulas Patocka struct rb_root write_tree; 1601dc267621SMikulas Patocka struct blk_plug plug; 1602dc267621SMikulas Patocka 1603dc267621SMikulas Patocka DECLARE_WAITQUEUE(wait, current); 1604dc267621SMikulas Patocka 1605dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1606dc267621SMikulas Patocka continue_locked: 1607dc267621SMikulas Patocka 1608b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1609dc267621SMikulas Patocka goto pop_from_list; 1610dc267621SMikulas Patocka 1611f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1612dc267621SMikulas Patocka __add_wait_queue(&cc->write_thread_wait, &wait); 1613dc267621SMikulas Patocka 1614dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1615dc267621SMikulas Patocka 1616f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1617642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1618f659b100SRabin Vincent remove_wait_queue(&cc->write_thread_wait, &wait); 1619f659b100SRabin Vincent break; 1620f659b100SRabin Vincent } 1621f659b100SRabin Vincent 1622dc267621SMikulas Patocka schedule(); 1623dc267621SMikulas Patocka 1624642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1625dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1626dc267621SMikulas Patocka __remove_wait_queue(&cc->write_thread_wait, &wait); 1627dc267621SMikulas Patocka goto continue_locked; 1628dc267621SMikulas Patocka 1629dc267621SMikulas Patocka pop_from_list: 1630b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1631b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1632dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1633dc267621SMikulas Patocka 1634b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1635b3c5fd30SMikulas Patocka 1636b3c5fd30SMikulas Patocka /* 1637b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1638b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1639b3c5fd30SMikulas Patocka */ 1640dc267621SMikulas Patocka blk_start_plug(&plug); 1641dc267621SMikulas Patocka do { 1642b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1643b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1644dc267621SMikulas Patocka kcryptd_io_write(io); 1645b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1646dc267621SMikulas Patocka blk_finish_plug(&plug); 1647dc267621SMikulas Patocka } 1648dc267621SMikulas Patocka return 0; 1649dc267621SMikulas Patocka } 1650dc267621SMikulas Patocka 165172c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 16524e4eef64SMilan Broz { 1653dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 165449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1655dc267621SMikulas Patocka unsigned long flags; 1656b3c5fd30SMikulas Patocka sector_t sector; 1657b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1658dec1cedfSMilan Broz 165972c6e7afSMikulas Patocka if (unlikely(io->error < 0)) { 1660dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1661dec1cedfSMilan Broz bio_put(clone); 16626c031f41SMilan Broz crypt_dec_pending(io); 1663dec1cedfSMilan Broz return; 1664dec1cedfSMilan Broz } 1665dec1cedfSMilan Broz 1666dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1667003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1668dec1cedfSMilan Broz 16694f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1670899c95d3SMilan Broz 16710f5d8e6eSMikulas Patocka if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { 16720f5d8e6eSMikulas Patocka generic_make_request(clone); 16730f5d8e6eSMikulas Patocka return; 16740f5d8e6eSMikulas Patocka } 16750f5d8e6eSMikulas Patocka 1676dc267621SMikulas Patocka spin_lock_irqsave(&cc->write_thread_wait.lock, flags); 1677b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1678b3c5fd30SMikulas Patocka parent = NULL; 1679b3c5fd30SMikulas Patocka sector = io->sector; 1680b3c5fd30SMikulas Patocka while (*rbp) { 1681b3c5fd30SMikulas Patocka parent = *rbp; 1682b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1683b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1684b3c5fd30SMikulas Patocka else 1685b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1686b3c5fd30SMikulas Patocka } 1687b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1688b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1689b3c5fd30SMikulas Patocka 1690dc267621SMikulas Patocka wake_up_locked(&cc->write_thread_wait); 1691dc267621SMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); 16924e4eef64SMilan Broz } 16934e4eef64SMilan Broz 1694fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 16958b004457SMilan Broz { 169649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16978b004457SMilan Broz struct bio *clone; 1698c8081618SMilan Broz int crypt_finished; 1699b635b00eSMilan Broz sector_t sector = io->sector; 1700dec1cedfSMilan Broz int r; 17018b004457SMilan Broz 170293e605c2SMilan Broz /* 1703fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 1704fc5a5e9aSMilan Broz */ 1705fc5a5e9aSMilan Broz crypt_inc_pending(io); 1706b635b00eSMilan Broz crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); 1707fc5a5e9aSMilan Broz 1708cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 170923541d2dSMilan Broz if (unlikely(!clone)) { 1710cf2f1abfSMikulas Patocka io->error = -EIO; 1711cf2f1abfSMikulas Patocka goto dec; 171223541d2dSMilan Broz } 17138b004457SMilan Broz 171453017030SMilan Broz io->ctx.bio_out = clone; 1715003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 17168b004457SMilan Broz 1717b635b00eSMilan Broz sector += bio_sectors(clone); 1718dec1cedfSMilan Broz 17194e594098SMilan Broz crypt_inc_pending(io); 1720dec1cedfSMilan Broz r = crypt_convert(cc, &io->ctx); 1721ef43aa38SMilan Broz if (r < 0) 1722ef43aa38SMilan Broz io->error = r; 172340b6229bSMikulas Patocka crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); 1724dec1cedfSMilan Broz 1725c8081618SMilan Broz /* Encryption was already finished, submit io now */ 1726c8081618SMilan Broz if (crypt_finished) { 172772c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 1728b635b00eSMilan Broz io->sector = sector; 17294e594098SMilan Broz } 173093e605c2SMilan Broz 1731cf2f1abfSMikulas Patocka dec: 1732899c95d3SMilan Broz crypt_dec_pending(io); 173384131db6SMilan Broz } 173484131db6SMilan Broz 173572c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 17365742fd77SMilan Broz { 17375742fd77SMilan Broz crypt_dec_pending(io); 17385742fd77SMilan Broz } 17395742fd77SMilan Broz 17404e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 17418b004457SMilan Broz { 174249a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 17435742fd77SMilan Broz int r = 0; 17448b004457SMilan Broz 17453e1a8bddSMilan Broz crypt_inc_pending(io); 17463a7f6c99SMilan Broz 174753017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 17480c395b0fSMilan Broz io->sector); 17498b004457SMilan Broz 17505742fd77SMilan Broz r = crypt_convert(cc, &io->ctx); 175172c6e7afSMikulas Patocka if (r < 0) 1752ef43aa38SMilan Broz io->error = r; 17535742fd77SMilan Broz 175440b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 175572c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 17563a7f6c99SMilan Broz 17573a7f6c99SMilan Broz crypt_dec_pending(io); 17588b004457SMilan Broz } 17598b004457SMilan Broz 176095497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 176195497a96SMilan Broz int error) 176295497a96SMilan Broz { 1763b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 1764b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 176595497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 176649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 176795497a96SMilan Broz 176854cea3f6SMilan Broz /* 176954cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 177054cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 177154cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 177254cea3f6SMilan Broz */ 1773c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 1774c0403ec0SRabin Vincent complete(&ctx->restart); 177595497a96SMilan Broz return; 1776c0403ec0SRabin Vincent } 177795497a96SMilan Broz 17782dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 1779ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 17802dc5327dSMilan Broz 1781ef43aa38SMilan Broz if (error == -EBADMSG) { 1782ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1783ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); 1784ef43aa38SMilan Broz io->error = -EILSEQ; 1785ef43aa38SMilan Broz } else if (error < 0) 178672c6e7afSMikulas Patocka io->error = -EIO; 178772c6e7afSMikulas Patocka 1788298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 178995497a96SMilan Broz 179040b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 1791c0403ec0SRabin Vincent return; 179295497a96SMilan Broz 179395497a96SMilan Broz if (bio_data_dir(io->base_bio) == READ) 179472c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 179595497a96SMilan Broz else 179672c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 179795497a96SMilan Broz } 179895497a96SMilan Broz 17994e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 18004e4eef64SMilan Broz { 18014e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 18024e4eef64SMilan Broz 18034e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 18044e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 18054e4eef64SMilan Broz else 18064e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 18078b004457SMilan Broz } 18088b004457SMilan Broz 1809395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 1810395b167cSAlasdair G Kergon { 181149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1812395b167cSAlasdair G Kergon 1813395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 1814395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 1815395b167cSAlasdair G Kergon } 1816395b167cSAlasdair G Kergon 1817ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 1818ef43aa38SMilan Broz { 1819ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 1820ef43aa38SMilan Broz return; 1821ef43aa38SMilan Broz 1822ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1823ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 1824ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 1825ef43aa38SMilan Broz } 1826ef43aa38SMilan Broz 1827ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 1828ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 1829ef43aa38SMilan Broz } 1830ef43aa38SMilan Broz 1831ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 1832d1f96423SMilan Broz { 1833d1f96423SMilan Broz unsigned i; 1834d1f96423SMilan Broz 1835ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1836fd2d231fSMikulas Patocka return; 1837fd2d231fSMikulas Patocka 1838d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 1839ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 1840ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 1841ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 1842d1f96423SMilan Broz } 1843d1f96423SMilan Broz 1844ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 1845ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 1846fd2d231fSMikulas Patocka } 1847fd2d231fSMikulas Patocka 1848ef43aa38SMilan Broz static void crypt_free_tfms(struct crypt_config *cc) 1849ef43aa38SMilan Broz { 185033d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1851ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 1852ef43aa38SMilan Broz else 1853ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 1854ef43aa38SMilan Broz } 1855ef43aa38SMilan Broz 1856ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 1857d1f96423SMilan Broz { 1858d1f96423SMilan Broz unsigned i; 1859d1f96423SMilan Broz int err; 1860d1f96423SMilan Broz 1861ef43aa38SMilan Broz cc->cipher_tfm.tfms = kzalloc(cc->tfms_count * 1862ef43aa38SMilan Broz sizeof(struct crypto_skcipher *), GFP_KERNEL); 1863ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1864fd2d231fSMikulas Patocka return -ENOMEM; 1865fd2d231fSMikulas Patocka 1866d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1867ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); 1868ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 1869ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 1870fd2d231fSMikulas Patocka crypt_free_tfms(cc); 1871d1f96423SMilan Broz return err; 1872d1f96423SMilan Broz } 1873d1f96423SMilan Broz } 1874d1f96423SMilan Broz 1875d1f96423SMilan Broz return 0; 1876d1f96423SMilan Broz } 1877d1f96423SMilan Broz 1878ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 1879ef43aa38SMilan Broz { 1880ef43aa38SMilan Broz int err; 1881ef43aa38SMilan Broz 1882ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 1883ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1884ef43aa38SMilan Broz return -ENOMEM; 1885ef43aa38SMilan Broz 1886ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); 1887ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1888ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 1889ef43aa38SMilan Broz crypt_free_tfms(cc); 1890ef43aa38SMilan Broz return err; 1891ef43aa38SMilan Broz } 1892ef43aa38SMilan Broz 1893ef43aa38SMilan Broz return 0; 1894ef43aa38SMilan Broz } 1895ef43aa38SMilan Broz 1896ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 1897ef43aa38SMilan Broz { 189833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1899ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 1900ef43aa38SMilan Broz else 1901ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 1902ef43aa38SMilan Broz } 1903ef43aa38SMilan Broz 1904ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 1905ef43aa38SMilan Broz { 1906ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 1907ef43aa38SMilan Broz } 1908ef43aa38SMilan Broz 1909ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 1910ef43aa38SMilan Broz { 1911ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 1912ef43aa38SMilan Broz } 1913ef43aa38SMilan Broz 1914ef43aa38SMilan Broz /* 1915ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 1916ef43aa38SMilan Broz * the key must be for some reason in special format. 1917ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 1918ef43aa38SMilan Broz */ 1919ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 1920ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 1921ef43aa38SMilan Broz { 1922ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 1923ef43aa38SMilan Broz struct rtattr *rta; 1924ef43aa38SMilan Broz 1925ef43aa38SMilan Broz rta = (struct rtattr *)p; 1926ef43aa38SMilan Broz param = RTA_DATA(rta); 1927ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 1928ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 1929ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 1930ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 1931ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 1932ef43aa38SMilan Broz p += authkeylen; 1933ef43aa38SMilan Broz memcpy(p, key, enckeylen); 1934ef43aa38SMilan Broz } 1935ef43aa38SMilan Broz 1936671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 1937c0297721SAndi Kleen { 1938da31a078SMilan Broz unsigned subkey_size; 1939fd2d231fSMikulas Patocka int err = 0, i, r; 1940c0297721SAndi Kleen 1941da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 1942ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 1943da31a078SMilan Broz 1944ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1945ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 1946ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 1947ef43aa38SMilan Broz cc->key_mac_size); 1948d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 194933d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) 195033d2f09fSMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 195133d2f09fSMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 195233d2f09fSMilan Broz else if (crypt_integrity_aead(cc)) 1953ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 1954ef43aa38SMilan Broz cc->key + (i * subkey_size), 1955ef43aa38SMilan Broz subkey_size); 1956ef43aa38SMilan Broz else 1957ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 1958fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 1959fd2d231fSMikulas Patocka subkey_size); 1960c0297721SAndi Kleen if (r) 1961c0297721SAndi Kleen err = r; 1962c0297721SAndi Kleen } 1963c0297721SAndi Kleen 1964ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1965ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 1966ef43aa38SMilan Broz 1967c0297721SAndi Kleen return err; 1968c0297721SAndi Kleen } 1969c0297721SAndi Kleen 1970c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 1971c538f6ecSOndrej Kozina 1972027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 1973027c431cSOndrej Kozina { 1974027c431cSOndrej Kozina while (*str) 1975027c431cSOndrej Kozina if (isspace(*str++)) 1976027c431cSOndrej Kozina return true; 1977027c431cSOndrej Kozina return false; 1978027c431cSOndrej Kozina } 1979027c431cSOndrej Kozina 1980c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 1981c538f6ecSOndrej Kozina { 1982c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 1983c538f6ecSOndrej Kozina int ret; 1984c538f6ecSOndrej Kozina struct key *key; 1985c538f6ecSOndrej Kozina const struct user_key_payload *ukp; 1986c538f6ecSOndrej Kozina 1987027c431cSOndrej Kozina /* 1988027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 1989027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 1990027c431cSOndrej Kozina */ 1991027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 1992027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 1993027c431cSOndrej Kozina return -EINVAL; 1994027c431cSOndrej Kozina } 1995027c431cSOndrej Kozina 1996c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 1997c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 1998c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 1999c538f6ecSOndrej Kozina return -EINVAL; 2000c538f6ecSOndrej Kozina 2001c538f6ecSOndrej Kozina if (strncmp(key_string, "logon:", key_desc - key_string + 1) && 2002c538f6ecSOndrej Kozina strncmp(key_string, "user:", key_desc - key_string + 1)) 2003c538f6ecSOndrej Kozina return -EINVAL; 2004c538f6ecSOndrej Kozina 2005c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2006c538f6ecSOndrej Kozina if (!new_key_string) 2007c538f6ecSOndrej Kozina return -ENOMEM; 2008c538f6ecSOndrej Kozina 2009c538f6ecSOndrej Kozina key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user, 2010c538f6ecSOndrej Kozina key_desc + 1, NULL); 2011c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2012c538f6ecSOndrej Kozina kzfree(new_key_string); 2013c538f6ecSOndrej Kozina return PTR_ERR(key); 2014c538f6ecSOndrej Kozina } 2015c538f6ecSOndrej Kozina 2016f5b0cba8SOndrej Kozina down_read(&key->sem); 2017c538f6ecSOndrej Kozina 20180837e49aSDavid Howells ukp = user_key_payload_locked(key); 2019c538f6ecSOndrej Kozina if (!ukp) { 2020f5b0cba8SOndrej Kozina up_read(&key->sem); 2021c538f6ecSOndrej Kozina key_put(key); 2022c538f6ecSOndrej Kozina kzfree(new_key_string); 2023c538f6ecSOndrej Kozina return -EKEYREVOKED; 2024c538f6ecSOndrej Kozina } 2025c538f6ecSOndrej Kozina 2026c538f6ecSOndrej Kozina if (cc->key_size != ukp->datalen) { 2027f5b0cba8SOndrej Kozina up_read(&key->sem); 2028c538f6ecSOndrej Kozina key_put(key); 2029c538f6ecSOndrej Kozina kzfree(new_key_string); 2030c538f6ecSOndrej Kozina return -EINVAL; 2031c538f6ecSOndrej Kozina } 2032c538f6ecSOndrej Kozina 2033c538f6ecSOndrej Kozina memcpy(cc->key, ukp->data, cc->key_size); 2034c538f6ecSOndrej Kozina 2035f5b0cba8SOndrej Kozina up_read(&key->sem); 2036c538f6ecSOndrej Kozina key_put(key); 2037c538f6ecSOndrej Kozina 2038c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2039c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2040c538f6ecSOndrej Kozina 2041c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2042c538f6ecSOndrej Kozina 2043c538f6ecSOndrej Kozina /* wipe the kernel key payload copy in each case */ 2044c538f6ecSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 2045c538f6ecSOndrej Kozina 2046c538f6ecSOndrej Kozina if (!ret) { 2047c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2048c538f6ecSOndrej Kozina kzfree(cc->key_string); 2049c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2050c538f6ecSOndrej Kozina } else 2051c538f6ecSOndrej Kozina kzfree(new_key_string); 2052c538f6ecSOndrej Kozina 2053c538f6ecSOndrej Kozina return ret; 2054c538f6ecSOndrej Kozina } 2055c538f6ecSOndrej Kozina 2056c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2057c538f6ecSOndrej Kozina { 2058c538f6ecSOndrej Kozina char *colon, dummy; 2059c538f6ecSOndrej Kozina int ret; 2060c538f6ecSOndrej Kozina 2061c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2062c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2063c538f6ecSOndrej Kozina 2064c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2065c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2066c538f6ecSOndrej Kozina if (!colon) 2067c538f6ecSOndrej Kozina return -EINVAL; 2068c538f6ecSOndrej Kozina 2069c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2070c538f6ecSOndrej Kozina return -EINVAL; 2071c538f6ecSOndrej Kozina 2072c538f6ecSOndrej Kozina *key_string = colon; 2073c538f6ecSOndrej Kozina 2074c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2075c538f6ecSOndrej Kozina 2076c538f6ecSOndrej Kozina return ret; 2077c538f6ecSOndrej Kozina } 2078c538f6ecSOndrej Kozina 2079c538f6ecSOndrej Kozina #else 2080c538f6ecSOndrej Kozina 2081c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2082c538f6ecSOndrej Kozina { 2083c538f6ecSOndrej Kozina return -EINVAL; 2084c538f6ecSOndrej Kozina } 2085c538f6ecSOndrej Kozina 2086c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2087c538f6ecSOndrej Kozina { 2088c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2089c538f6ecSOndrej Kozina } 2090c538f6ecSOndrej Kozina 2091c538f6ecSOndrej Kozina #endif 2092c538f6ecSOndrej Kozina 2093e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2094e48d4bbfSMilan Broz { 2095de8be5acSMilan Broz int r = -EINVAL; 2096de8be5acSMilan Broz int key_string_len = strlen(key); 2097de8be5acSMilan Broz 209869a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 209969a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2100de8be5acSMilan Broz goto out; 2101e48d4bbfSMilan Broz 2102c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2103c538f6ecSOndrej Kozina if (key[0] == ':') { 2104c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2105c538f6ecSOndrej Kozina goto out; 2106c538f6ecSOndrej Kozina } 2107c538f6ecSOndrej Kozina 2108265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2109265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2110265e9098SOndrej Kozina 2111c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2112c538f6ecSOndrej Kozina kzfree(cc->key_string); 2113c538f6ecSOndrej Kozina cc->key_string = NULL; 2114c538f6ecSOndrej Kozina 2115e944e03eSAndy Shevchenko /* Decode key from its hex representation. */ 2116e944e03eSAndy Shevchenko if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2117de8be5acSMilan Broz goto out; 2118e48d4bbfSMilan Broz 2119671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2120265e9098SOndrej Kozina if (!r) 2121e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2122e48d4bbfSMilan Broz 2123de8be5acSMilan Broz out: 2124de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2125de8be5acSMilan Broz memset(key, '0', key_string_len); 2126de8be5acSMilan Broz 2127de8be5acSMilan Broz return r; 2128e48d4bbfSMilan Broz } 2129e48d4bbfSMilan Broz 2130e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2131e48d4bbfSMilan Broz { 2132c82feeecSOndrej Kozina int r; 2133c82feeecSOndrej Kozina 2134e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2135c82feeecSOndrej Kozina get_random_bytes(&cc->key, cc->key_size); 2136c538f6ecSOndrej Kozina kzfree(cc->key_string); 2137c538f6ecSOndrej Kozina cc->key_string = NULL; 2138c82feeecSOndrej Kozina r = crypt_setkey(cc); 2139c82feeecSOndrej Kozina memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2140c0297721SAndi Kleen 2141c82feeecSOndrej Kozina return r; 2142e48d4bbfSMilan Broz } 2143e48d4bbfSMilan Broz 214428513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 214528513fccSMilan Broz { 214628513fccSMilan Broz struct crypt_config *cc = ti->private; 214728513fccSMilan Broz 214828513fccSMilan Broz ti->private = NULL; 214928513fccSMilan Broz 215028513fccSMilan Broz if (!cc) 215128513fccSMilan Broz return; 215228513fccSMilan Broz 2153f659b100SRabin Vincent if (cc->write_thread) 2154dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2155dc267621SMikulas Patocka 215628513fccSMilan Broz if (cc->io_queue) 215728513fccSMilan Broz destroy_workqueue(cc->io_queue); 215828513fccSMilan Broz if (cc->crypt_queue) 215928513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 216028513fccSMilan Broz 2161fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2162fd2d231fSMikulas Patocka 216328513fccSMilan Broz if (cc->bs) 216428513fccSMilan Broz bioset_free(cc->bs); 216528513fccSMilan Broz 216628513fccSMilan Broz mempool_destroy(cc->page_pool); 216728513fccSMilan Broz mempool_destroy(cc->req_pool); 2168ef43aa38SMilan Broz mempool_destroy(cc->tag_pool); 216928513fccSMilan Broz 217028513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 217128513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 217228513fccSMilan Broz 217328513fccSMilan Broz if (cc->dev) 217428513fccSMilan Broz dm_put_device(ti, cc->dev); 217528513fccSMilan Broz 21765ebaee6dSMilan Broz kzfree(cc->cipher); 21777dbcd137SMilan Broz kzfree(cc->cipher_string); 2178c538f6ecSOndrej Kozina kzfree(cc->key_string); 2179ef43aa38SMilan Broz kzfree(cc->cipher_auth); 2180ef43aa38SMilan Broz kzfree(cc->authenc_key); 218128513fccSMilan Broz 218228513fccSMilan Broz /* Must zero key material before freeing */ 218328513fccSMilan Broz kzfree(cc); 218428513fccSMilan Broz } 218528513fccSMilan Broz 2186e889f97aSMilan Broz static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 2187e889f97aSMilan Broz { 2188e889f97aSMilan Broz struct crypt_config *cc = ti->private; 2189e889f97aSMilan Broz 219033d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2191e889f97aSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2192e889f97aSMilan Broz else 2193e889f97aSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2194e889f97aSMilan Broz 2195e889f97aSMilan Broz if (cc->iv_size) 2196e889f97aSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 2197e889f97aSMilan Broz cc->iv_size = max(cc->iv_size, 2198e889f97aSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 2199e889f97aSMilan Broz else if (ivmode) { 2200e889f97aSMilan Broz DMWARN("Selected cipher does not support IVs"); 2201e889f97aSMilan Broz ivmode = NULL; 2202e889f97aSMilan Broz } 2203e889f97aSMilan Broz 2204e889f97aSMilan Broz /* Choose ivmode, see comments at iv code. */ 2205e889f97aSMilan Broz if (ivmode == NULL) 2206e889f97aSMilan Broz cc->iv_gen_ops = NULL; 2207e889f97aSMilan Broz else if (strcmp(ivmode, "plain") == 0) 2208e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_plain_ops; 2209e889f97aSMilan Broz else if (strcmp(ivmode, "plain64") == 0) 2210e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 2211e889f97aSMilan Broz else if (strcmp(ivmode, "essiv") == 0) 2212e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_essiv_ops; 2213e889f97aSMilan Broz else if (strcmp(ivmode, "benbi") == 0) 2214e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_benbi_ops; 2215e889f97aSMilan Broz else if (strcmp(ivmode, "null") == 0) 2216e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_null_ops; 2217e889f97aSMilan Broz else if (strcmp(ivmode, "lmk") == 0) { 2218e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2219e889f97aSMilan Broz /* 2220e889f97aSMilan Broz * Version 2 and 3 is recognised according 2221e889f97aSMilan Broz * to length of provided multi-key string. 2222e889f97aSMilan Broz * If present (version 3), last key is used as IV seed. 2223e889f97aSMilan Broz * All keys (including IV seed) are always the same size. 2224e889f97aSMilan Broz */ 2225e889f97aSMilan Broz if (cc->key_size % cc->key_parts) { 2226e889f97aSMilan Broz cc->key_parts++; 2227e889f97aSMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2228e889f97aSMilan Broz } 2229e889f97aSMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2230e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2231e889f97aSMilan Broz cc->key_parts += 2; /* IV + whitening */ 2232e889f97aSMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2233e889f97aSMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2234e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2235e889f97aSMilan Broz /* Need storage space in integrity fields. */ 2236e889f97aSMilan Broz cc->integrity_iv_size = cc->iv_size; 2237e889f97aSMilan Broz } else { 2238e889f97aSMilan Broz ti->error = "Invalid IV mode"; 2239e889f97aSMilan Broz return -EINVAL; 2240e889f97aSMilan Broz } 2241e889f97aSMilan Broz 2242e889f97aSMilan Broz return 0; 2243e889f97aSMilan Broz } 2244e889f97aSMilan Broz 224533d2f09fSMilan Broz /* 224633d2f09fSMilan Broz * Workaround to parse cipher algorithm from crypto API spec. 224733d2f09fSMilan Broz * The cc->cipher is currently used only in ESSIV. 224833d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 224933d2f09fSMilan Broz */ 225033d2f09fSMilan Broz static int crypt_ctr_blkdev_cipher(struct crypt_config *cc) 225133d2f09fSMilan Broz { 225233d2f09fSMilan Broz const char *alg_name = NULL; 225333d2f09fSMilan Broz char *start, *end; 225433d2f09fSMilan Broz 225533d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 225633d2f09fSMilan Broz alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc))); 225733d2f09fSMilan Broz if (!alg_name) 225833d2f09fSMilan Broz return -EINVAL; 225933d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) { 226033d2f09fSMilan Broz alg_name = strchr(alg_name, ','); 226133d2f09fSMilan Broz if (!alg_name) 226233d2f09fSMilan Broz return -EINVAL; 226333d2f09fSMilan Broz } 226433d2f09fSMilan Broz alg_name++; 226533d2f09fSMilan Broz } else { 226633d2f09fSMilan Broz alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc))); 226733d2f09fSMilan Broz if (!alg_name) 226833d2f09fSMilan Broz return -EINVAL; 226933d2f09fSMilan Broz } 227033d2f09fSMilan Broz 227133d2f09fSMilan Broz start = strchr(alg_name, '('); 227233d2f09fSMilan Broz end = strchr(alg_name, ')'); 227333d2f09fSMilan Broz 227433d2f09fSMilan Broz if (!start && !end) { 227533d2f09fSMilan Broz cc->cipher = kstrdup(alg_name, GFP_KERNEL); 227633d2f09fSMilan Broz return cc->cipher ? 0 : -ENOMEM; 227733d2f09fSMilan Broz } 227833d2f09fSMilan Broz 227933d2f09fSMilan Broz if (!start || !end || ++start >= end) 228033d2f09fSMilan Broz return -EINVAL; 228133d2f09fSMilan Broz 228233d2f09fSMilan Broz cc->cipher = kzalloc(end - start + 1, GFP_KERNEL); 228333d2f09fSMilan Broz if (!cc->cipher) 228433d2f09fSMilan Broz return -ENOMEM; 228533d2f09fSMilan Broz 228633d2f09fSMilan Broz strncpy(cc->cipher, start, end - start); 228733d2f09fSMilan Broz 228833d2f09fSMilan Broz return 0; 228933d2f09fSMilan Broz } 229033d2f09fSMilan Broz 229133d2f09fSMilan Broz /* 229233d2f09fSMilan Broz * Workaround to parse HMAC algorithm from AEAD crypto API spec. 229333d2f09fSMilan Broz * The HMAC is needed to calculate tag size (HMAC digest size). 229433d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 229533d2f09fSMilan Broz */ 229633d2f09fSMilan Broz static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 229733d2f09fSMilan Broz { 229833d2f09fSMilan Broz char *start, *end, *mac_alg = NULL; 229933d2f09fSMilan Broz struct crypto_ahash *mac; 230033d2f09fSMilan Broz 230133d2f09fSMilan Broz if (!strstarts(cipher_api, "authenc(")) 230233d2f09fSMilan Broz return 0; 230333d2f09fSMilan Broz 230433d2f09fSMilan Broz start = strchr(cipher_api, '('); 230533d2f09fSMilan Broz end = strchr(cipher_api, ','); 230633d2f09fSMilan Broz if (!start || !end || ++start > end) 230733d2f09fSMilan Broz return -EINVAL; 230833d2f09fSMilan Broz 230933d2f09fSMilan Broz mac_alg = kzalloc(end - start + 1, GFP_KERNEL); 231033d2f09fSMilan Broz if (!mac_alg) 231133d2f09fSMilan Broz return -ENOMEM; 231233d2f09fSMilan Broz strncpy(mac_alg, start, end - start); 231333d2f09fSMilan Broz 231433d2f09fSMilan Broz mac = crypto_alloc_ahash(mac_alg, 0, 0); 231533d2f09fSMilan Broz kfree(mac_alg); 231633d2f09fSMilan Broz 231733d2f09fSMilan Broz if (IS_ERR(mac)) 231833d2f09fSMilan Broz return PTR_ERR(mac); 231933d2f09fSMilan Broz 232033d2f09fSMilan Broz cc->key_mac_size = crypto_ahash_digestsize(mac); 232133d2f09fSMilan Broz crypto_free_ahash(mac); 232233d2f09fSMilan Broz 232333d2f09fSMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 232433d2f09fSMilan Broz if (!cc->authenc_key) 232533d2f09fSMilan Broz return -ENOMEM; 232633d2f09fSMilan Broz 232733d2f09fSMilan Broz return 0; 232833d2f09fSMilan Broz } 232933d2f09fSMilan Broz 233033d2f09fSMilan Broz static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 233133d2f09fSMilan Broz char **ivmode, char **ivopts) 23321da177e4SLinus Torvalds { 23335ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 233433d2f09fSMilan Broz char *tmp, *cipher_api; 233533d2f09fSMilan Broz int ret = -EINVAL; 233633d2f09fSMilan Broz 233733d2f09fSMilan Broz cc->tfms_count = 1; 233833d2f09fSMilan Broz 233933d2f09fSMilan Broz /* 234033d2f09fSMilan Broz * New format (capi: prefix) 234133d2f09fSMilan Broz * capi:cipher_api_spec-iv:ivopts 234233d2f09fSMilan Broz */ 234333d2f09fSMilan Broz tmp = &cipher_in[strlen("capi:")]; 234433d2f09fSMilan Broz cipher_api = strsep(&tmp, "-"); 234533d2f09fSMilan Broz *ivmode = strsep(&tmp, ":"); 234633d2f09fSMilan Broz *ivopts = tmp; 234733d2f09fSMilan Broz 234833d2f09fSMilan Broz if (*ivmode && !strcmp(*ivmode, "lmk")) 234933d2f09fSMilan Broz cc->tfms_count = 64; 235033d2f09fSMilan Broz 235133d2f09fSMilan Broz cc->key_parts = cc->tfms_count; 235233d2f09fSMilan Broz 235333d2f09fSMilan Broz /* Allocate cipher */ 235433d2f09fSMilan Broz ret = crypt_alloc_tfms(cc, cipher_api); 235533d2f09fSMilan Broz if (ret < 0) { 235633d2f09fSMilan Broz ti->error = "Error allocating crypto tfm"; 235733d2f09fSMilan Broz return ret; 235833d2f09fSMilan Broz } 235933d2f09fSMilan Broz 236033d2f09fSMilan Broz /* Alloc AEAD, can be used only in new format. */ 236133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 236233d2f09fSMilan Broz ret = crypt_ctr_auth_cipher(cc, cipher_api); 236333d2f09fSMilan Broz if (ret < 0) { 236433d2f09fSMilan Broz ti->error = "Invalid AEAD cipher spec"; 236533d2f09fSMilan Broz return -ENOMEM; 236633d2f09fSMilan Broz } 236733d2f09fSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 236833d2f09fSMilan Broz } else 236933d2f09fSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 237033d2f09fSMilan Broz 237133d2f09fSMilan Broz ret = crypt_ctr_blkdev_cipher(cc); 237233d2f09fSMilan Broz if (ret < 0) { 237333d2f09fSMilan Broz ti->error = "Cannot allocate cipher string"; 237433d2f09fSMilan Broz return -ENOMEM; 237533d2f09fSMilan Broz } 237633d2f09fSMilan Broz 237733d2f09fSMilan Broz return 0; 237833d2f09fSMilan Broz } 237933d2f09fSMilan Broz 238033d2f09fSMilan Broz static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 238133d2f09fSMilan Broz char **ivmode, char **ivopts) 238233d2f09fSMilan Broz { 238333d2f09fSMilan Broz struct crypt_config *cc = ti->private; 238433d2f09fSMilan Broz char *tmp, *cipher, *chainmode, *keycount; 23855ebaee6dSMilan Broz char *cipher_api = NULL; 2386fd2d231fSMikulas Patocka int ret = -EINVAL; 238731998ef1SMikulas Patocka char dummy; 23881da177e4SLinus Torvalds 238933d2f09fSMilan Broz if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 23905ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 23911da177e4SLinus Torvalds return -EINVAL; 23921da177e4SLinus Torvalds } 23931da177e4SLinus Torvalds 23945ebaee6dSMilan Broz /* 23955ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 2396d1f96423SMilan Broz * cipher[:keycount]-mode-iv:ivopts 23975ebaee6dSMilan Broz */ 23985ebaee6dSMilan Broz tmp = cipher_in; 2399d1f96423SMilan Broz keycount = strsep(&tmp, "-"); 2400d1f96423SMilan Broz cipher = strsep(&keycount, ":"); 2401d1f96423SMilan Broz 2402d1f96423SMilan Broz if (!keycount) 2403d1f96423SMilan Broz cc->tfms_count = 1; 240431998ef1SMikulas Patocka else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 2405d1f96423SMilan Broz !is_power_of_2(cc->tfms_count)) { 2406d1f96423SMilan Broz ti->error = "Bad cipher key count specification"; 2407d1f96423SMilan Broz return -EINVAL; 2408d1f96423SMilan Broz } 2409d1f96423SMilan Broz cc->key_parts = cc->tfms_count; 24105ebaee6dSMilan Broz 24115ebaee6dSMilan Broz cc->cipher = kstrdup(cipher, GFP_KERNEL); 24125ebaee6dSMilan Broz if (!cc->cipher) 24135ebaee6dSMilan Broz goto bad_mem; 24145ebaee6dSMilan Broz 24151da177e4SLinus Torvalds chainmode = strsep(&tmp, "-"); 241633d2f09fSMilan Broz *ivopts = strsep(&tmp, "-"); 241733d2f09fSMilan Broz *ivmode = strsep(&*ivopts, ":"); 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds if (tmp) 24205ebaee6dSMilan Broz DMWARN("Ignoring unexpected additional cipher options"); 24211da177e4SLinus Torvalds 24227dbcd137SMilan Broz /* 24237dbcd137SMilan Broz * For compatibility with the original dm-crypt mapping format, if 24247dbcd137SMilan Broz * only the cipher name is supplied, use cbc-plain. 24257dbcd137SMilan Broz */ 242633d2f09fSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 24271da177e4SLinus Torvalds chainmode = "cbc"; 242833d2f09fSMilan Broz *ivmode = "plain"; 24291da177e4SLinus Torvalds } 24301da177e4SLinus Torvalds 243133d2f09fSMilan Broz if (strcmp(chainmode, "ecb") && !*ivmode) { 24325ebaee6dSMilan Broz ti->error = "IV mechanism required"; 24335ebaee6dSMilan Broz return -EINVAL; 24341da177e4SLinus Torvalds } 24351da177e4SLinus Torvalds 24365ebaee6dSMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 24375ebaee6dSMilan Broz if (!cipher_api) 24385ebaee6dSMilan Broz goto bad_mem; 24395ebaee6dSMilan Broz 24405ebaee6dSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 24415ebaee6dSMilan Broz "%s(%s)", chainmode, cipher); 24425ebaee6dSMilan Broz if (ret < 0) { 24435ebaee6dSMilan Broz kfree(cipher_api); 24445ebaee6dSMilan Broz goto bad_mem; 2445d1806f6aSHerbert Xu } 2446d1806f6aSHerbert Xu 24475ebaee6dSMilan Broz /* Allocate cipher */ 2448fd2d231fSMikulas Patocka ret = crypt_alloc_tfms(cc, cipher_api); 2449d1f96423SMilan Broz if (ret < 0) { 245072d94861SAlasdair G Kergon ti->error = "Error allocating crypto tfm"; 245133d2f09fSMilan Broz kfree(cipher_api); 245233d2f09fSMilan Broz return ret; 24531da177e4SLinus Torvalds } 24541da177e4SLinus Torvalds 245533d2f09fSMilan Broz return 0; 245633d2f09fSMilan Broz bad_mem: 245733d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 245833d2f09fSMilan Broz return -ENOMEM; 245933d2f09fSMilan Broz } 246033d2f09fSMilan Broz 246133d2f09fSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 246233d2f09fSMilan Broz { 246333d2f09fSMilan Broz struct crypt_config *cc = ti->private; 246433d2f09fSMilan Broz char *ivmode = NULL, *ivopts = NULL; 246533d2f09fSMilan Broz int ret; 246633d2f09fSMilan Broz 246733d2f09fSMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 246833d2f09fSMilan Broz if (!cc->cipher_string) { 246933d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 247033d2f09fSMilan Broz return -ENOMEM; 247133d2f09fSMilan Broz } 247233d2f09fSMilan Broz 247333d2f09fSMilan Broz if (strstarts(cipher_in, "capi:")) 247433d2f09fSMilan Broz ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 247533d2f09fSMilan Broz else 247633d2f09fSMilan Broz ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 247733d2f09fSMilan Broz if (ret) 247833d2f09fSMilan Broz return ret; 247933d2f09fSMilan Broz 24805ebaee6dSMilan Broz /* Initialize IV */ 2481e889f97aSMilan Broz ret = crypt_ctr_ivmode(ti, ivmode); 2482e889f97aSMilan Broz if (ret < 0) 248333d2f09fSMilan Broz return ret; 24841da177e4SLinus Torvalds 2485da31a078SMilan Broz /* Initialize and set key */ 2486da31a078SMilan Broz ret = crypt_set_key(cc, key); 2487da31a078SMilan Broz if (ret < 0) { 2488da31a078SMilan Broz ti->error = "Error decoding and setting key"; 248933d2f09fSMilan Broz return ret; 2490da31a078SMilan Broz } 2491da31a078SMilan Broz 249228513fccSMilan Broz /* Allocate IV */ 249328513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 249428513fccSMilan Broz ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 249528513fccSMilan Broz if (ret < 0) { 249628513fccSMilan Broz ti->error = "Error creating IV"; 249733d2f09fSMilan Broz return ret; 249828513fccSMilan Broz } 249928513fccSMilan Broz } 25001da177e4SLinus Torvalds 250128513fccSMilan Broz /* Initialize IV (set keys for ESSIV etc) */ 250228513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 250328513fccSMilan Broz ret = cc->iv_gen_ops->init(cc); 250428513fccSMilan Broz if (ret < 0) { 2505b95bf2d3SMilan Broz ti->error = "Error initialising IV"; 25065ebaee6dSMilan Broz return ret; 250733d2f09fSMilan Broz } 250833d2f09fSMilan Broz } 25095ebaee6dSMilan Broz 251033d2f09fSMilan Broz return ret; 25111da177e4SLinus Torvalds } 25125ebaee6dSMilan Broz 2513ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 2514ef43aa38SMilan Broz { 2515ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 2516ef43aa38SMilan Broz struct dm_arg_set as; 2517ef43aa38SMilan Broz static struct dm_arg _args[] = { 25188f0009a2SMilan Broz {0, 6, "Invalid number of feature args"}, 2519ef43aa38SMilan Broz }; 2520ef43aa38SMilan Broz unsigned int opt_params, val; 2521ef43aa38SMilan Broz const char *opt_string, *sval; 25228f0009a2SMilan Broz char dummy; 2523ef43aa38SMilan Broz int ret; 2524ef43aa38SMilan Broz 2525ef43aa38SMilan Broz /* Optional parameters */ 2526ef43aa38SMilan Broz as.argc = argc; 2527ef43aa38SMilan Broz as.argv = argv; 2528ef43aa38SMilan Broz 2529ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 2530ef43aa38SMilan Broz if (ret) 2531ef43aa38SMilan Broz return ret; 2532ef43aa38SMilan Broz 2533ef43aa38SMilan Broz while (opt_params--) { 2534ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 2535ef43aa38SMilan Broz if (!opt_string) { 2536ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 2537ef43aa38SMilan Broz return -EINVAL; 2538ef43aa38SMilan Broz } 2539ef43aa38SMilan Broz 2540ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 2541ef43aa38SMilan Broz ti->num_discard_bios = 1; 2542ef43aa38SMilan Broz 2543ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 2544ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 2545ef43aa38SMilan Broz 2546ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 2547ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2548ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 2549ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 2550ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 2551ef43aa38SMilan Broz return -EINVAL; 2552ef43aa38SMilan Broz } 2553ef43aa38SMilan Broz cc->on_disk_tag_size = val; 2554ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 2555ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 2556ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 2557ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 2558ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 2559ef43aa38SMilan Broz return -EINVAL; 2560ef43aa38SMilan Broz } 2561ef43aa38SMilan Broz 2562ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 2563ef43aa38SMilan Broz if (!cc->cipher_auth) 2564ef43aa38SMilan Broz return -ENOMEM; 2565ff3af92bSMikulas Patocka } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { 25668f0009a2SMilan Broz if (cc->sector_size < (1 << SECTOR_SHIFT) || 25678f0009a2SMilan Broz cc->sector_size > 4096 || 2568ff3af92bSMikulas Patocka (cc->sector_size & (cc->sector_size - 1))) { 25698f0009a2SMilan Broz ti->error = "Invalid feature value for sector_size"; 25708f0009a2SMilan Broz return -EINVAL; 25718f0009a2SMilan Broz } 2572ff3af92bSMikulas Patocka cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 25738f0009a2SMilan Broz } else if (!strcasecmp(opt_string, "iv_large_sectors")) 25748f0009a2SMilan Broz set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 25758f0009a2SMilan Broz else { 2576ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 2577ef43aa38SMilan Broz return -EINVAL; 2578ef43aa38SMilan Broz } 2579ef43aa38SMilan Broz } 2580ef43aa38SMilan Broz 2581ef43aa38SMilan Broz return 0; 2582ef43aa38SMilan Broz } 2583ef43aa38SMilan Broz 25845ebaee6dSMilan Broz /* 25855ebaee6dSMilan Broz * Construct an encryption mapping: 2586c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 25875ebaee6dSMilan Broz */ 25885ebaee6dSMilan Broz static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 25895ebaee6dSMilan Broz { 25905ebaee6dSMilan Broz struct crypt_config *cc; 2591c538f6ecSOndrej Kozina int key_size; 2592ef43aa38SMilan Broz unsigned int align_mask; 25935ebaee6dSMilan Broz unsigned long long tmpll; 25945ebaee6dSMilan Broz int ret; 2595ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 259631998ef1SMikulas Patocka char dummy; 25975ebaee6dSMilan Broz 2598772ae5f5SMilan Broz if (argc < 5) { 25995ebaee6dSMilan Broz ti->error = "Not enough arguments"; 26005ebaee6dSMilan Broz return -EINVAL; 26011da177e4SLinus Torvalds } 26021da177e4SLinus Torvalds 2603c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 2604c538f6ecSOndrej Kozina if (key_size < 0) { 2605c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 2606c538f6ecSOndrej Kozina return -EINVAL; 2607c538f6ecSOndrej Kozina } 26085ebaee6dSMilan Broz 26095ebaee6dSMilan Broz cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); 26105ebaee6dSMilan Broz if (!cc) { 26115ebaee6dSMilan Broz ti->error = "Cannot allocate encryption context"; 26125ebaee6dSMilan Broz return -ENOMEM; 26135ebaee6dSMilan Broz } 261469a8cfcdSMilan Broz cc->key_size = key_size; 26158f0009a2SMilan Broz cc->sector_size = (1 << SECTOR_SHIFT); 2616ff3af92bSMikulas Patocka cc->sector_shift = 0; 26175ebaee6dSMilan Broz 26185ebaee6dSMilan Broz ti->private = cc; 2619ef43aa38SMilan Broz 2620ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 2621ef43aa38SMilan Broz if (argc > 5) { 2622ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 2623ef43aa38SMilan Broz if (ret) 2624ef43aa38SMilan Broz goto bad; 2625ef43aa38SMilan Broz } 2626ef43aa38SMilan Broz 26275ebaee6dSMilan Broz ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 26285ebaee6dSMilan Broz if (ret < 0) 26295ebaee6dSMilan Broz goto bad; 26305ebaee6dSMilan Broz 263133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 2632ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 2633ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 2634ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 2635ef43aa38SMilan Broz } else { 2636bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 2637bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 2638ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 2639ef43aa38SMilan Broz } 2640d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 2641d49ec52fSMikulas Patocka 2642ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 2643d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 2644d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 2645ef43aa38SMilan Broz & align_mask; 2646d49ec52fSMikulas Patocka } else { 2647d49ec52fSMikulas Patocka /* 2648d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 2649d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 2650d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 2651d49ec52fSMikulas Patocka */ 2652ef43aa38SMilan Broz iv_size_padding = align_mask; 2653d49ec52fSMikulas Patocka } 2654ddd42edfSMilan Broz 265594f5e024SMikulas Patocka ret = -ENOMEM; 2656ef43aa38SMilan Broz 2657ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 2658ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 2659ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 2660ef43aa38SMilan Broz cc->iv_size + 2661ef43aa38SMilan Broz sizeof(uint64_t) + 2662ef43aa38SMilan Broz sizeof(unsigned int); 2663ef43aa38SMilan Broz 2664ef43aa38SMilan Broz cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size); 2665ddd42edfSMilan Broz if (!cc->req_pool) { 2666ddd42edfSMilan Broz ti->error = "Cannot allocate crypt request mempool"; 266728513fccSMilan Broz goto bad; 2668ddd42edfSMilan Broz } 2669ddd42edfSMilan Broz 267030187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 2671ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 2672d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 2673298a9fa0SMikulas Patocka 2674cf2f1abfSMikulas Patocka cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); 26751da177e4SLinus Torvalds if (!cc->page_pool) { 267672d94861SAlasdair G Kergon ti->error = "Cannot allocate page mempool"; 267728513fccSMilan Broz goto bad; 26781da177e4SLinus Torvalds } 26791da177e4SLinus Torvalds 2680bb799ca0SJens Axboe cc->bs = bioset_create(MIN_IOS, 0); 26816a24c718SMilan Broz if (!cc->bs) { 26826a24c718SMilan Broz ti->error = "Cannot allocate crypt bioset"; 268328513fccSMilan Broz goto bad; 26846a24c718SMilan Broz } 26856a24c718SMilan Broz 26867145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 26877145c241SMikulas Patocka 268828513fccSMilan Broz ret = -EINVAL; 26898f0009a2SMilan Broz if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 26908f0009a2SMilan Broz (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 269172d94861SAlasdair G Kergon ti->error = "Invalid iv_offset sector"; 269228513fccSMilan Broz goto bad; 26931da177e4SLinus Torvalds } 26944ee218cdSAndrew Morton cc->iv_offset = tmpll; 26951da177e4SLinus Torvalds 2696e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 2697e80d1c80SVivek Goyal if (ret) { 269828513fccSMilan Broz ti->error = "Device lookup failed"; 269928513fccSMilan Broz goto bad; 270028513fccSMilan Broz } 270128513fccSMilan Broz 2702e80d1c80SVivek Goyal ret = -EINVAL; 270331998ef1SMikulas Patocka if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { 270472d94861SAlasdair G Kergon ti->error = "Invalid device sector"; 270528513fccSMilan Broz goto bad; 27061da177e4SLinus Torvalds } 27074ee218cdSAndrew Morton cc->start = tmpll; 27081da177e4SLinus Torvalds 270933d2f09fSMilan Broz if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 2710ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 2711772ae5f5SMilan Broz if (ret) 2712772ae5f5SMilan Broz goto bad; 2713772ae5f5SMilan Broz 2714ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 2715ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 2716ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 2717ef43aa38SMilan Broz 2718ef43aa38SMilan Broz cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS, 2719ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 2720ef43aa38SMilan Broz if (!cc->tag_pool) { 2721ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 2722f3396c58SMikulas Patocka goto bad; 2723f3396c58SMikulas Patocka } 2724583fe747SMikulas Patocka 2725583fe747SMikulas Patocka cc->tag_pool_max_sectors <<= cc->sector_shift; 2726f3396c58SMikulas Patocka } 2727772ae5f5SMilan Broz 272828513fccSMilan Broz ret = -ENOMEM; 2729a1b89132STim Murray cc->io_queue = alloc_workqueue("kcryptd_io", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); 2730cabf08e4SMilan Broz if (!cc->io_queue) { 2731cabf08e4SMilan Broz ti->error = "Couldn't create kcryptd io queue"; 273228513fccSMilan Broz goto bad; 2733cabf08e4SMilan Broz } 2734cabf08e4SMilan Broz 2735f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2736a1b89132STim Murray cc->crypt_queue = alloc_workqueue("kcryptd", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); 2737f3396c58SMikulas Patocka else 2738a1b89132STim Murray cc->crypt_queue = alloc_workqueue("kcryptd", 2739a1b89132STim Murray WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 2740f3396c58SMikulas Patocka num_online_cpus()); 2741cabf08e4SMilan Broz if (!cc->crypt_queue) { 27429934a8beSMilan Broz ti->error = "Couldn't create kcryptd queue"; 274328513fccSMilan Broz goto bad; 27449934a8beSMilan Broz } 27459934a8beSMilan Broz 2746dc267621SMikulas Patocka init_waitqueue_head(&cc->write_thread_wait); 2747b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 2748dc267621SMikulas Patocka 2749dc267621SMikulas Patocka cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); 2750dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 2751dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 2752dc267621SMikulas Patocka cc->write_thread = NULL; 2753dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 2754dc267621SMikulas Patocka goto bad; 2755dc267621SMikulas Patocka } 2756dc267621SMikulas Patocka wake_up_process(cc->write_thread); 2757dc267621SMikulas Patocka 275855a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 27590ac55489SAlasdair G Kergon ti->discard_zeroes_data_unsupported = true; 2760983c7db3SMilan Broz 27611da177e4SLinus Torvalds return 0; 27621da177e4SLinus Torvalds 276328513fccSMilan Broz bad: 276428513fccSMilan Broz crypt_dtr(ti); 276528513fccSMilan Broz return ret; 27661da177e4SLinus Torvalds } 27671da177e4SLinus Torvalds 27687de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 27691da177e4SLinus Torvalds { 2770028867acSAlasdair G Kergon struct dm_crypt_io *io; 277149a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 2772647c7db1SMikulas Patocka 2773772ae5f5SMilan Broz /* 277428a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 277528a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 2776e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 2777772ae5f5SMilan Broz */ 27781eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 277928a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 2780647c7db1SMikulas Patocka bio->bi_bdev = cc->dev->bdev; 2781772ae5f5SMilan Broz if (bio_sectors(bio)) 27824f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 27834f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 2784647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 2785647c7db1SMikulas Patocka } 27861da177e4SLinus Torvalds 27874e870e94SMikulas Patocka /* 27884e870e94SMikulas Patocka * Check if bio is too large, split as needed. 27894e870e94SMikulas Patocka */ 27904e870e94SMikulas Patocka if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && 2791ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 27924e870e94SMikulas Patocka dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); 27934e870e94SMikulas Patocka 27948f0009a2SMilan Broz /* 27958f0009a2SMilan Broz * Ensure that bio is a multiple of internal sector encryption size 27968f0009a2SMilan Broz * and is aligned to this size as defined in IO hints. 27978f0009a2SMilan Broz */ 27988f0009a2SMilan Broz if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 27998f0009a2SMilan Broz return -EIO; 28008f0009a2SMilan Broz 28018f0009a2SMilan Broz if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 28028f0009a2SMilan Broz return -EIO; 28038f0009a2SMilan Broz 2804298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 2805298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 2806ef43aa38SMilan Broz 2807ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 2808583fe747SMikulas Patocka unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); 2809ef43aa38SMilan Broz 2810ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 2811583fe747SMikulas Patocka unlikely(!(io->integrity_metadata = kmalloc(tag_len, 2812ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 2813ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 2814ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 2815ef43aa38SMilan Broz io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO); 2816ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 2817ef43aa38SMilan Broz } 2818ef43aa38SMilan Broz } 2819ef43aa38SMilan Broz 282033d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2821ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 2822ef43aa38SMilan Broz else 2823ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 2824cabf08e4SMilan Broz 282520c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 282620c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 2827dc267621SMikulas Patocka kcryptd_queue_read(io); 282820c82538SMilan Broz } else 2829cabf08e4SMilan Broz kcryptd_queue_crypt(io); 28301da177e4SLinus Torvalds 2831d2a7ad29SKiyoshi Ueda return DM_MAPIO_SUBMITTED; 28321da177e4SLinus Torvalds } 28331da177e4SLinus Torvalds 2834fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 28351f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 28361da177e4SLinus Torvalds { 28375ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2838fd7c092eSMikulas Patocka unsigned i, sz = 0; 2839f3396c58SMikulas Patocka int num_feature_args = 0; 28401da177e4SLinus Torvalds 28411da177e4SLinus Torvalds switch (type) { 28421da177e4SLinus Torvalds case STATUSTYPE_INFO: 28431da177e4SLinus Torvalds result[0] = '\0'; 28441da177e4SLinus Torvalds break; 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds case STATUSTYPE_TABLE: 28477dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 28481da177e4SLinus Torvalds 2849c538f6ecSOndrej Kozina if (cc->key_size > 0) { 2850c538f6ecSOndrej Kozina if (cc->key_string) 2851c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 2852c538f6ecSOndrej Kozina else 2853fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 2854fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 2855c538f6ecSOndrej Kozina } else 2856fd7c092eSMikulas Patocka DMEMIT("-"); 28571da177e4SLinus Torvalds 28584ee218cdSAndrew Morton DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 28594ee218cdSAndrew Morton cc->dev->name, (unsigned long long)cc->start); 2860772ae5f5SMilan Broz 2861f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 2862f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 28630f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2864ff3af92bSMikulas Patocka num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 28658f0009a2SMilan Broz num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 2866ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2867ef43aa38SMilan Broz num_feature_args++; 2868f3396c58SMikulas Patocka if (num_feature_args) { 2869f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 287055a62eefSAlasdair G Kergon if (ti->num_discard_bios) 2871f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 2872f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2873f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 28740f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 28750f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 2876ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2877ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 28788f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) 28798f0009a2SMilan Broz DMEMIT(" sector_size:%d", cc->sector_size); 28808f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 28818f0009a2SMilan Broz DMEMIT(" iv_large_sectors"); 2882f3396c58SMikulas Patocka } 2883772ae5f5SMilan Broz 28841da177e4SLinus Torvalds break; 28851da177e4SLinus Torvalds } 28861da177e4SLinus Torvalds } 28871da177e4SLinus Torvalds 2888e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 2889e48d4bbfSMilan Broz { 2890e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2891e48d4bbfSMilan Broz 2892e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2893e48d4bbfSMilan Broz } 2894e48d4bbfSMilan Broz 2895e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 2896e48d4bbfSMilan Broz { 2897e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2898e48d4bbfSMilan Broz 2899e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 2900e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 2901e48d4bbfSMilan Broz return -EAGAIN; 2902e48d4bbfSMilan Broz } 2903e48d4bbfSMilan Broz 2904e48d4bbfSMilan Broz return 0; 2905e48d4bbfSMilan Broz } 2906e48d4bbfSMilan Broz 2907e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 2908e48d4bbfSMilan Broz { 2909e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2910e48d4bbfSMilan Broz 2911e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2912e48d4bbfSMilan Broz } 2913e48d4bbfSMilan Broz 2914e48d4bbfSMilan Broz /* Message interface 2915e48d4bbfSMilan Broz * key set <key> 2916e48d4bbfSMilan Broz * key wipe 2917e48d4bbfSMilan Broz */ 2918e48d4bbfSMilan Broz static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) 2919e48d4bbfSMilan Broz { 2920e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2921c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 2922e48d4bbfSMilan Broz 2923e48d4bbfSMilan Broz if (argc < 2) 2924e48d4bbfSMilan Broz goto error; 2925e48d4bbfSMilan Broz 2926498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 2927e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 2928e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 2929e48d4bbfSMilan Broz return -EINVAL; 2930e48d4bbfSMilan Broz } 2931498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 2932c538f6ecSOndrej Kozina /* The key size may not be changed. */ 2933c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 2934c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 2935c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 2936c538f6ecSOndrej Kozina return -EINVAL; 2937c538f6ecSOndrej Kozina } 2938c538f6ecSOndrej Kozina 2939542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 2940542da317SMilan Broz if (ret) 2941542da317SMilan Broz return ret; 2942542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 2943542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 2944542da317SMilan Broz return ret; 2945542da317SMilan Broz } 2946498f0103SMike Snitzer if (argc == 2 && !strcasecmp(argv[1], "wipe")) { 2947542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 2948542da317SMilan Broz ret = cc->iv_gen_ops->wipe(cc); 2949542da317SMilan Broz if (ret) 2950542da317SMilan Broz return ret; 2951542da317SMilan Broz } 2952e48d4bbfSMilan Broz return crypt_wipe_key(cc); 2953e48d4bbfSMilan Broz } 2954542da317SMilan Broz } 2955e48d4bbfSMilan Broz 2956e48d4bbfSMilan Broz error: 2957e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 2958e48d4bbfSMilan Broz return -EINVAL; 2959e48d4bbfSMilan Broz } 2960e48d4bbfSMilan Broz 2961af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 2962af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 2963af4874e0SMike Snitzer { 2964af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 2965af4874e0SMike Snitzer 29665dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 2967af4874e0SMike Snitzer } 2968af4874e0SMike Snitzer 2969586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 2970586b286bSMike Snitzer { 29718f0009a2SMilan Broz struct crypt_config *cc = ti->private; 29728f0009a2SMilan Broz 2973586b286bSMike Snitzer /* 2974586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 2975586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 2976586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 2977586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 2978586b286bSMike Snitzer */ 2979586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 29808f0009a2SMilan Broz 29818f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 29828f0009a2SMilan Broz limits->logical_block_size = cc->sector_size; 29838f0009a2SMilan Broz limits->physical_block_size = cc->sector_size; 29848f0009a2SMilan Broz blk_limits_io_min(limits, cc->sector_size); 29858f0009a2SMilan Broz } 2986586b286bSMike Snitzer } 2987586b286bSMike Snitzer 29881da177e4SLinus Torvalds static struct target_type crypt_target = { 29891da177e4SLinus Torvalds .name = "crypt", 29908f0009a2SMilan Broz .version = {1, 17, 0}, 29911da177e4SLinus Torvalds .module = THIS_MODULE, 29921da177e4SLinus Torvalds .ctr = crypt_ctr, 29931da177e4SLinus Torvalds .dtr = crypt_dtr, 29941da177e4SLinus Torvalds .map = crypt_map, 29951da177e4SLinus Torvalds .status = crypt_status, 2996e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 2997e48d4bbfSMilan Broz .preresume = crypt_preresume, 2998e48d4bbfSMilan Broz .resume = crypt_resume, 2999e48d4bbfSMilan Broz .message = crypt_message, 3000af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 3001586b286bSMike Snitzer .io_hints = crypt_io_hints, 30021da177e4SLinus Torvalds }; 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds static int __init dm_crypt_init(void) 30051da177e4SLinus Torvalds { 30061da177e4SLinus Torvalds int r; 30071da177e4SLinus Torvalds 30081da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 300994f5e024SMikulas Patocka if (r < 0) 301072d94861SAlasdair G Kergon DMERR("register failed %d", r); 30111da177e4SLinus Torvalds 30121da177e4SLinus Torvalds return r; 30131da177e4SLinus Torvalds } 30141da177e4SLinus Torvalds 30151da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 30161da177e4SLinus Torvalds { 301710d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 30181da177e4SLinus Torvalds } 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds module_init(dm_crypt_init); 30211da177e4SLinus Torvalds module_exit(dm_crypt_exit); 30221da177e4SLinus Torvalds 3023bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 30241da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 30251da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 3026