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 */ 132ef43aa38SMilan Broz CRYPT_MODE_INTEGRITY_HMAC, /* Compose authenticated mode from normal mode and HMAC */ 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; 1751da177e4SLinus Torvalds 176fd2d231fSMikulas Patocka /* ESSIV: struct crypto_cipher *essiv_tfm */ 177fd2d231fSMikulas Patocka void *iv_private; 178ef43aa38SMilan Broz union { 179bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 180ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 181ef43aa38SMilan Broz } cipher_tfm; 182d1f96423SMilan Broz unsigned tfms_count; 183ef43aa38SMilan Broz unsigned long cipher_flags; 184c0297721SAndi Kleen 185c0297721SAndi Kleen /* 186ddd42edfSMilan Broz * Layout of each crypto request: 187ddd42edfSMilan Broz * 188bbdb23b5SHerbert Xu * struct skcipher_request 189ddd42edfSMilan Broz * context 190ddd42edfSMilan Broz * padding 191ddd42edfSMilan Broz * struct dm_crypt_request 192ddd42edfSMilan Broz * padding 193ddd42edfSMilan Broz * IV 194ddd42edfSMilan Broz * 195ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 196ddd42edfSMilan Broz * correctly aligned. 197ddd42edfSMilan Broz */ 198ddd42edfSMilan Broz unsigned int dmreq_start; 199ddd42edfSMilan Broz 200298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 201298a9fa0SMikulas Patocka 202e48d4bbfSMilan Broz unsigned long flags; 2031da177e4SLinus Torvalds unsigned int key_size; 204da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 205da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 206ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 207ef43aa38SMilan Broz 208ef43aa38SMilan Broz unsigned int integrity_tag_size; 209ef43aa38SMilan Broz unsigned int integrity_iv_size; 210ef43aa38SMilan Broz unsigned int on_disk_tag_size; 211ef43aa38SMilan Broz 212ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 2131da177e4SLinus Torvalds u8 key[0]; 2141da177e4SLinus Torvalds }; 2151da177e4SLinus Torvalds 2160a83df6cSMikulas Patocka #define MIN_IOS 64 217ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 218ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2191da177e4SLinus Torvalds 220028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 221395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 222ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 223ef43aa38SMilan Broz struct scatterlist *sg); 224027581f3SOlaf Kirch 225c0297721SAndi Kleen /* 226c0297721SAndi Kleen * Use this to access cipher attributes that are the same for each CPU. 227c0297721SAndi Kleen */ 228bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 229c0297721SAndi Kleen { 230ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 231ef43aa38SMilan Broz } 232ef43aa38SMilan Broz 233ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 234ef43aa38SMilan Broz { 235ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 236c0297721SAndi Kleen } 237c0297721SAndi Kleen 2381da177e4SLinus Torvalds /* 2391da177e4SLinus Torvalds * Different IV generation algorithms: 2401da177e4SLinus Torvalds * 2413c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2423a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2431da177e4SLinus Torvalds * 24461afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 24561afef61SMilan Broz * number, padded with zeros if necessary. 24661afef61SMilan Broz * 2473c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2481da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2491da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2501da177e4SLinus Torvalds * 25148527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 25248527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 25348527fa7SRik Snel * 25446b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 25546b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 25646b47730SLudwig Nussel * 25734745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 25834745785SMilan Broz * by the Loop-AES block device encryption system 25934745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 26034745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 26134745785SMilan Broz * with an IV derived from the sector number, the data and 26234745785SMilan Broz * optionally extra IV seed. 26334745785SMilan Broz * This means that after decryption the first block 26434745785SMilan Broz * of sector must be tweaked according to decrypted data. 26534745785SMilan Broz * Loop-AES can use three encryption schemes: 26634745785SMilan Broz * version 1: is plain aes-cbc mode 26734745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 26834745785SMilan Broz * version 3: the same as version 2 with additional IV seed 26934745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 27034745785SMilan Broz * 271ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 272ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 273e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 274ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 275ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 276ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 277ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 278ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 279ed04d981SMilan Broz * and should be used for old compatible containers access only. 280ed04d981SMilan Broz * 2811da177e4SLinus Torvalds * plumb: unimplemented, see: 2821da177e4SLinus Torvalds * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 2831da177e4SLinus Torvalds */ 2841da177e4SLinus Torvalds 2852dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 2862dc5327dSMilan Broz struct dm_crypt_request *dmreq) 2871da177e4SLinus Torvalds { 2881da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 289283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds return 0; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29461afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 2952dc5327dSMilan Broz struct dm_crypt_request *dmreq) 29661afef61SMilan Broz { 29761afef61SMilan Broz memset(iv, 0, cc->iv_size); 298283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 29961afef61SMilan Broz 30061afef61SMilan Broz return 0; 30161afef61SMilan Broz } 30261afef61SMilan Broz 303b95bf2d3SMilan Broz /* Initialise ESSIV - compute salt but no local memory allocations */ 304b95bf2d3SMilan Broz static int crypt_iv_essiv_init(struct crypt_config *cc) 305b95bf2d3SMilan Broz { 306b95bf2d3SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 307bbdb23b5SHerbert Xu AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); 308b95bf2d3SMilan Broz struct scatterlist sg; 309c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 310fd2d231fSMikulas Patocka int err; 311b95bf2d3SMilan Broz 312b95bf2d3SMilan Broz sg_init_one(&sg, cc->key, cc->key_size); 313bbdb23b5SHerbert Xu ahash_request_set_tfm(req, essiv->hash_tfm); 314bbdb23b5SHerbert Xu ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); 315bbdb23b5SHerbert Xu ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); 316b95bf2d3SMilan Broz 317bbdb23b5SHerbert Xu err = crypto_ahash_digest(req); 318bbdb23b5SHerbert Xu ahash_request_zero(req); 319b95bf2d3SMilan Broz if (err) 320b95bf2d3SMilan Broz return err; 321b95bf2d3SMilan Broz 322fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 323c0297721SAndi Kleen 324c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, essiv->salt, 325bbdb23b5SHerbert Xu crypto_ahash_digestsize(essiv->hash_tfm)); 326c0297721SAndi Kleen if (err) 327c0297721SAndi Kleen return err; 328c0297721SAndi Kleen 329c0297721SAndi Kleen return 0; 330b95bf2d3SMilan Broz } 331b95bf2d3SMilan Broz 332542da317SMilan Broz /* Wipe salt and reset key derived from volume key */ 333542da317SMilan Broz static int crypt_iv_essiv_wipe(struct crypt_config *cc) 334542da317SMilan Broz { 335542da317SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 336bbdb23b5SHerbert Xu unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); 337c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 338fd2d231fSMikulas Patocka int r, err = 0; 339542da317SMilan Broz 340542da317SMilan Broz memset(essiv->salt, 0, salt_size); 341542da317SMilan Broz 342fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 343c0297721SAndi Kleen r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); 344c0297721SAndi Kleen if (r) 345c0297721SAndi Kleen err = r; 346c0297721SAndi Kleen 347c0297721SAndi Kleen return err; 348c0297721SAndi Kleen } 349c0297721SAndi Kleen 350c0297721SAndi Kleen /* Set up per cpu cipher state */ 351c0297721SAndi Kleen static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, 352c0297721SAndi Kleen struct dm_target *ti, 353c0297721SAndi Kleen u8 *salt, unsigned saltsize) 354c0297721SAndi Kleen { 355c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 356c0297721SAndi Kleen int err; 357c0297721SAndi Kleen 358c0297721SAndi Kleen /* Setup the essiv_tfm with the given salt */ 359c0297721SAndi Kleen essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); 360c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 361c0297721SAndi Kleen ti->error = "Error allocating crypto tfm for ESSIV"; 362c0297721SAndi Kleen return essiv_tfm; 363c0297721SAndi Kleen } 364c0297721SAndi Kleen 365ef43aa38SMilan Broz if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { 366c0297721SAndi Kleen ti->error = "Block size of ESSIV cipher does " 367c0297721SAndi Kleen "not match IV size of block cipher"; 368c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 369c0297721SAndi Kleen return ERR_PTR(-EINVAL); 370c0297721SAndi Kleen } 371c0297721SAndi Kleen 372c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); 373c0297721SAndi Kleen if (err) { 374c0297721SAndi Kleen ti->error = "Failed to set key for ESSIV cipher"; 375c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 376c0297721SAndi Kleen return ERR_PTR(err); 377c0297721SAndi Kleen } 378c0297721SAndi Kleen 379c0297721SAndi Kleen return essiv_tfm; 380542da317SMilan Broz } 381542da317SMilan Broz 38260473592SMilan Broz static void crypt_iv_essiv_dtr(struct crypt_config *cc) 38360473592SMilan Broz { 384c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 38560473592SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 38660473592SMilan Broz 387bbdb23b5SHerbert Xu crypto_free_ahash(essiv->hash_tfm); 388b95bf2d3SMilan Broz essiv->hash_tfm = NULL; 389b95bf2d3SMilan Broz 390b95bf2d3SMilan Broz kzfree(essiv->salt); 391b95bf2d3SMilan Broz essiv->salt = NULL; 392c0297721SAndi Kleen 393fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 394c0297721SAndi Kleen 395c0297721SAndi Kleen if (essiv_tfm) 396c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 397c0297721SAndi Kleen 398fd2d231fSMikulas Patocka cc->iv_private = NULL; 39960473592SMilan Broz } 40060473592SMilan Broz 4011da177e4SLinus Torvalds static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, 4021da177e4SLinus Torvalds const char *opts) 4031da177e4SLinus Torvalds { 4045861f1beSMilan Broz struct crypto_cipher *essiv_tfm = NULL; 405bbdb23b5SHerbert Xu struct crypto_ahash *hash_tfm = NULL; 4065861f1beSMilan Broz u8 *salt = NULL; 407fd2d231fSMikulas Patocka int err; 4081da177e4SLinus Torvalds 4095861f1beSMilan Broz if (!opts) { 41072d94861SAlasdair G Kergon ti->error = "Digest algorithm missing for ESSIV mode"; 4111da177e4SLinus Torvalds return -EINVAL; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 414b95bf2d3SMilan Broz /* Allocate hash algorithm */ 415bbdb23b5SHerbert Xu hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); 41635058687SHerbert Xu if (IS_ERR(hash_tfm)) { 41772d94861SAlasdair G Kergon ti->error = "Error initializing ESSIV hash"; 4185861f1beSMilan Broz err = PTR_ERR(hash_tfm); 4195861f1beSMilan Broz goto bad; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 422bbdb23b5SHerbert Xu salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); 4235861f1beSMilan Broz if (!salt) { 42472d94861SAlasdair G Kergon ti->error = "Error kmallocing salt storage in ESSIV"; 4255861f1beSMilan Broz err = -ENOMEM; 4265861f1beSMilan Broz goto bad; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 429b95bf2d3SMilan Broz cc->iv_gen_private.essiv.salt = salt; 430b95bf2d3SMilan Broz cc->iv_gen_private.essiv.hash_tfm = hash_tfm; 431b95bf2d3SMilan Broz 432c0297721SAndi Kleen essiv_tfm = setup_essiv_cpu(cc, ti, salt, 433bbdb23b5SHerbert Xu crypto_ahash_digestsize(hash_tfm)); 434ef43aa38SMilan Broz 435c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 436c0297721SAndi Kleen crypt_iv_essiv_dtr(cc); 437c0297721SAndi Kleen return PTR_ERR(essiv_tfm); 438c0297721SAndi Kleen } 439fd2d231fSMikulas Patocka cc->iv_private = essiv_tfm; 440c0297721SAndi Kleen 4411da177e4SLinus Torvalds return 0; 4425861f1beSMilan Broz 4435861f1beSMilan Broz bad: 4445861f1beSMilan Broz if (hash_tfm && !IS_ERR(hash_tfm)) 445bbdb23b5SHerbert Xu crypto_free_ahash(hash_tfm); 446b95bf2d3SMilan Broz kfree(salt); 4475861f1beSMilan Broz return err; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 4502dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 4512dc5327dSMilan Broz struct dm_crypt_request *dmreq) 4521da177e4SLinus Torvalds { 453fd2d231fSMikulas Patocka struct crypto_cipher *essiv_tfm = cc->iv_private; 454c0297721SAndi Kleen 4551da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 456283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 457c0297721SAndi Kleen crypto_cipher_encrypt_one(essiv_tfm, iv, iv); 458c0297721SAndi Kleen 4591da177e4SLinus Torvalds return 0; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 46248527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 46348527fa7SRik Snel const char *opts) 46448527fa7SRik Snel { 465bbdb23b5SHerbert Xu unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); 466f0d1b0b3SDavid Howells int log = ilog2(bs); 46748527fa7SRik Snel 46848527fa7SRik Snel /* we need to calculate how far we must shift the sector count 46948527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 47048527fa7SRik Snel 47148527fa7SRik Snel if (1 << log != bs) { 47248527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 47348527fa7SRik Snel return -EINVAL; 47448527fa7SRik Snel } 47548527fa7SRik Snel 47648527fa7SRik Snel if (log > 9) { 47748527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 47848527fa7SRik Snel return -EINVAL; 47948527fa7SRik Snel } 48048527fa7SRik Snel 48160473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 48248527fa7SRik Snel 48348527fa7SRik Snel return 0; 48448527fa7SRik Snel } 48548527fa7SRik Snel 48648527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 48748527fa7SRik Snel { 48848527fa7SRik Snel } 48948527fa7SRik Snel 4902dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 4912dc5327dSMilan Broz struct dm_crypt_request *dmreq) 49248527fa7SRik Snel { 49379066ad3SHerbert Xu __be64 val; 49479066ad3SHerbert Xu 49548527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 49679066ad3SHerbert Xu 4972dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 49879066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 49948527fa7SRik Snel 5001da177e4SLinus Torvalds return 0; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5032dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 5042dc5327dSMilan Broz struct dm_crypt_request *dmreq) 50546b47730SLudwig Nussel { 50646b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 50746b47730SLudwig Nussel 50846b47730SLudwig Nussel return 0; 50946b47730SLudwig Nussel } 51046b47730SLudwig Nussel 51134745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 51234745785SMilan Broz { 51334745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 51434745785SMilan Broz 51534745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 51634745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 51734745785SMilan Broz lmk->hash_tfm = NULL; 51834745785SMilan Broz 51934745785SMilan Broz kzfree(lmk->seed); 52034745785SMilan Broz lmk->seed = NULL; 52134745785SMilan Broz } 52234745785SMilan Broz 52334745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 52434745785SMilan Broz const char *opts) 52534745785SMilan Broz { 52634745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 52734745785SMilan Broz 52834745785SMilan Broz lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); 52934745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 53034745785SMilan Broz ti->error = "Error initializing LMK hash"; 53134745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 53234745785SMilan Broz } 53334745785SMilan Broz 53434745785SMilan Broz /* No seed in LMK version 2 */ 53534745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 53634745785SMilan Broz lmk->seed = NULL; 53734745785SMilan Broz return 0; 53834745785SMilan Broz } 53934745785SMilan Broz 54034745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 54134745785SMilan Broz if (!lmk->seed) { 54234745785SMilan Broz crypt_iv_lmk_dtr(cc); 54334745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 54434745785SMilan Broz return -ENOMEM; 54534745785SMilan Broz } 54634745785SMilan Broz 54734745785SMilan Broz return 0; 54834745785SMilan Broz } 54934745785SMilan Broz 55034745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 55134745785SMilan Broz { 55234745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 55334745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 55434745785SMilan Broz 55534745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 55634745785SMilan Broz if (lmk->seed) 55734745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 55834745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 55934745785SMilan Broz 56034745785SMilan Broz return 0; 56134745785SMilan Broz } 56234745785SMilan Broz 56334745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 56434745785SMilan Broz { 56534745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 56634745785SMilan Broz 56734745785SMilan Broz if (lmk->seed) 56834745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 56934745785SMilan Broz 57034745785SMilan Broz return 0; 57134745785SMilan Broz } 57234745785SMilan Broz 57334745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 57434745785SMilan Broz struct dm_crypt_request *dmreq, 57534745785SMilan Broz u8 *data) 57634745785SMilan Broz { 57734745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 578b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 57934745785SMilan Broz struct md5_state md5state; 580da31a078SMilan Broz __le32 buf[4]; 58134745785SMilan Broz int i, r; 58234745785SMilan Broz 583b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 584b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 58534745785SMilan Broz 586b6106265SJan-Simon Möller r = crypto_shash_init(desc); 58734745785SMilan Broz if (r) 58834745785SMilan Broz return r; 58934745785SMilan Broz 59034745785SMilan Broz if (lmk->seed) { 591b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 59234745785SMilan Broz if (r) 59334745785SMilan Broz return r; 59434745785SMilan Broz } 59534745785SMilan Broz 59634745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 597b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 59834745785SMilan Broz if (r) 59934745785SMilan Broz return r; 60034745785SMilan Broz 60134745785SMilan Broz /* Sector is cropped to 56 bits here */ 60234745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 60334745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 60434745785SMilan Broz buf[2] = cpu_to_le32(4024); 60534745785SMilan Broz buf[3] = 0; 606b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 60734745785SMilan Broz if (r) 60834745785SMilan Broz return r; 60934745785SMilan Broz 61034745785SMilan Broz /* No MD5 padding here */ 611b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 61234745785SMilan Broz if (r) 61334745785SMilan Broz return r; 61434745785SMilan Broz 61534745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 61634745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 61734745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 61834745785SMilan Broz 61934745785SMilan Broz return 0; 62034745785SMilan Broz } 62134745785SMilan Broz 62234745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 62334745785SMilan Broz struct dm_crypt_request *dmreq) 62434745785SMilan Broz { 625ef43aa38SMilan Broz struct scatterlist *sg; 62634745785SMilan Broz u8 *src; 62734745785SMilan Broz int r = 0; 62834745785SMilan Broz 62934745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 630ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 631ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 632ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 633c2e022cbSCong Wang kunmap_atomic(src); 63434745785SMilan Broz } else 63534745785SMilan Broz memset(iv, 0, cc->iv_size); 63634745785SMilan Broz 63734745785SMilan Broz return r; 63834745785SMilan Broz } 63934745785SMilan Broz 64034745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 64134745785SMilan Broz struct dm_crypt_request *dmreq) 64234745785SMilan Broz { 643ef43aa38SMilan Broz struct scatterlist *sg; 64434745785SMilan Broz u8 *dst; 64534745785SMilan Broz int r; 64634745785SMilan Broz 64734745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 64834745785SMilan Broz return 0; 64934745785SMilan Broz 650ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 651ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 652ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 65334745785SMilan Broz 65434745785SMilan Broz /* Tweak the first block of plaintext sector */ 65534745785SMilan Broz if (!r) 656ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 65734745785SMilan Broz 658c2e022cbSCong Wang kunmap_atomic(dst); 65934745785SMilan Broz return r; 66034745785SMilan Broz } 66134745785SMilan Broz 662ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 663ed04d981SMilan Broz { 664ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 665ed04d981SMilan Broz 666ed04d981SMilan Broz kzfree(tcw->iv_seed); 667ed04d981SMilan Broz tcw->iv_seed = NULL; 668ed04d981SMilan Broz kzfree(tcw->whitening); 669ed04d981SMilan Broz tcw->whitening = NULL; 670ed04d981SMilan Broz 671ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 672ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 673ed04d981SMilan Broz tcw->crc32_tfm = NULL; 674ed04d981SMilan Broz } 675ed04d981SMilan Broz 676ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 677ed04d981SMilan Broz const char *opts) 678ed04d981SMilan Broz { 679ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 680ed04d981SMilan Broz 681ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 682ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 683ed04d981SMilan Broz return -EINVAL; 684ed04d981SMilan Broz } 685ed04d981SMilan Broz 686ed04d981SMilan Broz tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); 687ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 688ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 689ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 690ed04d981SMilan Broz } 691ed04d981SMilan Broz 692ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 693ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 694ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 695ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 696ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 697ed04d981SMilan Broz return -ENOMEM; 698ed04d981SMilan Broz } 699ed04d981SMilan Broz 700ed04d981SMilan Broz return 0; 701ed04d981SMilan Broz } 702ed04d981SMilan Broz 703ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 704ed04d981SMilan Broz { 705ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 706ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 707ed04d981SMilan Broz 708ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 709ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 710ed04d981SMilan Broz TCW_WHITENING_SIZE); 711ed04d981SMilan Broz 712ed04d981SMilan Broz return 0; 713ed04d981SMilan Broz } 714ed04d981SMilan Broz 715ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 716ed04d981SMilan Broz { 717ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 718ed04d981SMilan Broz 719ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 720ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 721ed04d981SMilan Broz 722ed04d981SMilan Broz return 0; 723ed04d981SMilan Broz } 724ed04d981SMilan Broz 725ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 726ed04d981SMilan Broz struct dm_crypt_request *dmreq, 727ed04d981SMilan Broz u8 *data) 728ed04d981SMilan Broz { 729ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 730350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 731ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 732b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 733ed04d981SMilan Broz int i, r; 734ed04d981SMilan Broz 735ed04d981SMilan Broz /* xor whitening with sector number */ 736ed04d981SMilan Broz memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); 737ed04d981SMilan Broz crypto_xor(buf, (u8 *)§or, 8); 738ed04d981SMilan Broz crypto_xor(&buf[8], (u8 *)§or, 8); 739ed04d981SMilan Broz 740ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 741b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 742b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 743ed04d981SMilan Broz for (i = 0; i < 4; i++) { 744b6106265SJan-Simon Möller r = crypto_shash_init(desc); 745ed04d981SMilan Broz if (r) 746ed04d981SMilan Broz goto out; 747b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 748ed04d981SMilan Broz if (r) 749ed04d981SMilan Broz goto out; 750b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 751ed04d981SMilan Broz if (r) 752ed04d981SMilan Broz goto out; 753ed04d981SMilan Broz } 754ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 755ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 756ed04d981SMilan Broz 757ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 758ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 759ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 760ed04d981SMilan Broz out: 7611a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 762ed04d981SMilan Broz return r; 763ed04d981SMilan Broz } 764ed04d981SMilan Broz 765ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 766ed04d981SMilan Broz struct dm_crypt_request *dmreq) 767ed04d981SMilan Broz { 768ef43aa38SMilan Broz struct scatterlist *sg; 769ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 770350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 771ed04d981SMilan Broz u8 *src; 772ed04d981SMilan Broz int r = 0; 773ed04d981SMilan Broz 774ed04d981SMilan Broz /* Remove whitening from ciphertext */ 775ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 776ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 777ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 778ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 779ed04d981SMilan Broz kunmap_atomic(src); 780ed04d981SMilan Broz } 781ed04d981SMilan Broz 782ed04d981SMilan Broz /* Calculate IV */ 783ed04d981SMilan Broz memcpy(iv, tcw->iv_seed, cc->iv_size); 784ed04d981SMilan Broz crypto_xor(iv, (u8 *)§or, 8); 785ed04d981SMilan Broz if (cc->iv_size > 8) 786ed04d981SMilan Broz crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); 787ed04d981SMilan Broz 788ed04d981SMilan Broz return r; 789ed04d981SMilan Broz } 790ed04d981SMilan Broz 791ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 792ed04d981SMilan Broz struct dm_crypt_request *dmreq) 793ed04d981SMilan Broz { 794ef43aa38SMilan Broz struct scatterlist *sg; 795ed04d981SMilan Broz u8 *dst; 796ed04d981SMilan Broz int r; 797ed04d981SMilan Broz 798ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 799ed04d981SMilan Broz return 0; 800ed04d981SMilan Broz 801ed04d981SMilan Broz /* Apply whitening on ciphertext */ 802ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 803ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 804ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 805ed04d981SMilan Broz kunmap_atomic(dst); 806ed04d981SMilan Broz 807ed04d981SMilan Broz return r; 808ed04d981SMilan Broz } 809ed04d981SMilan Broz 810ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 811ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 812ef43aa38SMilan Broz { 813ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 814ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 815ef43aa38SMilan Broz return 0; 816ef43aa38SMilan Broz } 817ef43aa38SMilan Broz 8181b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 8191da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 8201da177e4SLinus Torvalds }; 8211da177e4SLinus Torvalds 8221b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 82361afef61SMilan Broz .generator = crypt_iv_plain64_gen 82461afef61SMilan Broz }; 82561afef61SMilan Broz 8261b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 8271da177e4SLinus Torvalds .ctr = crypt_iv_essiv_ctr, 8281da177e4SLinus Torvalds .dtr = crypt_iv_essiv_dtr, 829b95bf2d3SMilan Broz .init = crypt_iv_essiv_init, 830542da317SMilan Broz .wipe = crypt_iv_essiv_wipe, 8311da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 8321da177e4SLinus Torvalds }; 8331da177e4SLinus Torvalds 8341b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 83548527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 83648527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 83748527fa7SRik Snel .generator = crypt_iv_benbi_gen 83848527fa7SRik Snel }; 8391da177e4SLinus Torvalds 8401b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 84146b47730SLudwig Nussel .generator = crypt_iv_null_gen 84246b47730SLudwig Nussel }; 84346b47730SLudwig Nussel 8441b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 84534745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 84634745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 84734745785SMilan Broz .init = crypt_iv_lmk_init, 84834745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 84934745785SMilan Broz .generator = crypt_iv_lmk_gen, 85034745785SMilan Broz .post = crypt_iv_lmk_post 85134745785SMilan Broz }; 85234745785SMilan Broz 8531b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 854ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 855ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 856ed04d981SMilan Broz .init = crypt_iv_tcw_init, 857ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 858ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 859ed04d981SMilan Broz .post = crypt_iv_tcw_post 860ed04d981SMilan Broz }; 861ed04d981SMilan Broz 862ef43aa38SMilan Broz static struct crypt_iv_operations crypt_iv_random_ops = { 863ef43aa38SMilan Broz .generator = crypt_iv_random_gen 864ef43aa38SMilan Broz }; 865ef43aa38SMilan Broz 866ef43aa38SMilan Broz /* 867ef43aa38SMilan Broz * Integrity extensions 868ef43aa38SMilan Broz */ 869ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 870ef43aa38SMilan Broz { 871ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 872ef43aa38SMilan Broz } 873ef43aa38SMilan Broz 874ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 875ef43aa38SMilan Broz { 876ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_HMAC, &cc->cipher_flags); 877ef43aa38SMilan Broz } 878ef43aa38SMilan Broz 879ef43aa38SMilan Broz static bool crypt_integrity_mode(struct crypt_config *cc) 880ef43aa38SMilan Broz { 881ef43aa38SMilan Broz return crypt_integrity_aead(cc) || crypt_integrity_hmac(cc); 882ef43aa38SMilan Broz } 883ef43aa38SMilan Broz 884ef43aa38SMilan Broz /* Get sg containing data */ 885ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 886ef43aa38SMilan Broz struct scatterlist *sg) 887ef43aa38SMilan Broz { 888ef43aa38SMilan Broz if (unlikely(crypt_integrity_mode(cc))) 889ef43aa38SMilan Broz return &sg[2]; 890ef43aa38SMilan Broz 891ef43aa38SMilan Broz return sg; 892ef43aa38SMilan Broz } 893ef43aa38SMilan Broz 894ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 895ef43aa38SMilan Broz { 896ef43aa38SMilan Broz struct bio_integrity_payload *bip; 897ef43aa38SMilan Broz unsigned int tag_len; 898ef43aa38SMilan Broz int ret; 899ef43aa38SMilan Broz 900ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 901ef43aa38SMilan Broz return 0; 902ef43aa38SMilan Broz 903ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 904ef43aa38SMilan Broz if (IS_ERR(bip)) 905ef43aa38SMilan Broz return PTR_ERR(bip); 906ef43aa38SMilan Broz 907ef43aa38SMilan Broz tag_len = io->cc->on_disk_tag_size * bio_sectors(bio); 908ef43aa38SMilan Broz 909ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 910ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 911ef43aa38SMilan Broz 912ef43aa38SMilan Broz /* We own the metadata, do not let bio_free to release it */ 913ef43aa38SMilan Broz bip->bip_flags &= ~BIP_BLOCK_INTEGRITY; 914ef43aa38SMilan Broz 915ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 916ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 917ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 918ef43aa38SMilan Broz return -ENOMEM; 919ef43aa38SMilan Broz 920ef43aa38SMilan Broz return 0; 921ef43aa38SMilan Broz } 922ef43aa38SMilan Broz 923ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 924ef43aa38SMilan Broz { 925ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 926ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 927ef43aa38SMilan Broz 928ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 929ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 930ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 931ef43aa38SMilan Broz return -EINVAL; 932ef43aa38SMilan Broz } 933ef43aa38SMilan Broz 934ef43aa38SMilan Broz if (bi->tag_size != cc->on_disk_tag_size) { 935ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 936ef43aa38SMilan Broz return -EINVAL; 937ef43aa38SMilan Broz } 938ef43aa38SMilan Broz 939ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) { 940ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 941ef43aa38SMilan Broz DMINFO("Integrity AEAD, tag size %u, IV size %u.", 942ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 943ef43aa38SMilan Broz 944ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 945ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 946ef43aa38SMilan Broz return -EINVAL; 947ef43aa38SMilan Broz } 948ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 949ef43aa38SMilan Broz DMINFO("Additional per-sector space %u bytes for IV.", 950ef43aa38SMilan Broz cc->integrity_iv_size); 951ef43aa38SMilan Broz 952ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 953ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 954ef43aa38SMilan Broz return -EINVAL; 955ef43aa38SMilan Broz } 956ef43aa38SMilan Broz 957ef43aa38SMilan Broz return 0; 958ef43aa38SMilan Broz #else 959ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 960ef43aa38SMilan Broz return -EINVAL; 961ef43aa38SMilan Broz #endif 962ef43aa38SMilan Broz } 963ef43aa38SMilan Broz 964d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 965d469f841SMilan Broz struct convert_context *ctx, 9661da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 967fcd369daSMilan Broz sector_t sector) 9681da177e4SLinus Torvalds { 9691da177e4SLinus Torvalds ctx->bio_in = bio_in; 9701da177e4SLinus Torvalds ctx->bio_out = bio_out; 971003b5c57SKent Overstreet if (bio_in) 972003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 973003b5c57SKent Overstreet if (bio_out) 974003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 975c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 97643d69034SMilan Broz init_completion(&ctx->restart); 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 979b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 980ef43aa38SMilan Broz void *req) 981b2174eebSHuang Ying { 982b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 983b2174eebSHuang Ying } 984b2174eebSHuang Ying 985ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 986b2174eebSHuang Ying { 987ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 988b2174eebSHuang Ying } 989b2174eebSHuang Ying 9902dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 9912dc5327dSMilan Broz struct dm_crypt_request *dmreq) 9922dc5327dSMilan Broz { 993ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 994ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 995ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 996ef43aa38SMilan Broz else 9972dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 998bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 9992dc5327dSMilan Broz } 10002dc5327dSMilan Broz 1001ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1002ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1003ef43aa38SMilan Broz { 1004ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1005ef43aa38SMilan Broz } 1006ef43aa38SMilan Broz 1007ef43aa38SMilan Broz static uint64_t *org_sector_of_dmreq(struct crypt_config *cc, 1008ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1009ef43aa38SMilan Broz { 1010ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1011ef43aa38SMilan Broz return (uint64_t*) ptr; 1012ef43aa38SMilan Broz } 1013ef43aa38SMilan Broz 1014ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1015ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1016ef43aa38SMilan Broz { 1017ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1018ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1019ef43aa38SMilan Broz return (unsigned int*)ptr; 1020ef43aa38SMilan Broz } 1021ef43aa38SMilan Broz 1022ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1023ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1024ef43aa38SMilan Broz { 1025ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1026ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1027ef43aa38SMilan Broz 1028ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1029ef43aa38SMilan Broz cc->on_disk_tag_size]; 1030ef43aa38SMilan Broz } 1031ef43aa38SMilan Broz 1032ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1033ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1034ef43aa38SMilan Broz { 1035ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1036ef43aa38SMilan Broz } 1037ef43aa38SMilan Broz 1038ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 10393a7f6c99SMilan Broz struct convert_context *ctx, 1040ef43aa38SMilan Broz struct aead_request *req, 1041ef43aa38SMilan Broz unsigned int tag_offset) 104201482b76SMilan Broz { 1043003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1044003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 10453a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1046ef43aa38SMilan Broz unsigned int data_len = 1 << SECTOR_SHIFT; 1047ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1048ef43aa38SMilan Broz uint64_t *sector; 1049ef43aa38SMilan Broz int r = 0; 1050ef43aa38SMilan Broz 1051ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 105201482b76SMilan Broz 1053b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1054c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 1055b2174eebSHuang Ying dmreq->ctx = ctx; 105601482b76SMilan Broz 1057ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 105801482b76SMilan Broz 1059ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1060ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1061ef43aa38SMilan Broz 1062ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1063ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1064ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1065ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1066ef43aa38SMilan Broz 1067ef43aa38SMilan Broz /* AEAD request: 1068ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1069ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1070ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1071ef43aa38SMilan Broz */ 1072ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1073ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1074ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 1075ef43aa38SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, data_len, bv_in.bv_offset); 1076ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1077ef43aa38SMilan Broz 1078ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1079ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1080ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 1081ef43aa38SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, data_len, bv_out.bv_offset); 1082ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 108301482b76SMilan Broz 10843a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1085ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1086ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1087ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1088ef43aa38SMilan Broz } else { 1089ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 10903a7f6c99SMilan Broz if (r < 0) 10913a7f6c99SMilan Broz return r; 1092ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1093ef43aa38SMilan Broz if (cc->integrity_iv_size) 1094ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1095ef43aa38SMilan Broz } 1096ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1097ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1098ef43aa38SMilan Broz } 1099ef43aa38SMilan Broz 1100ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1101ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1102ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1103ef43aa38SMilan Broz data_len, iv); 1104ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1105ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1106ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1107ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1108ef43aa38SMilan Broz } else { 1109ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1110ef43aa38SMilan Broz data_len + cc->integrity_tag_size, iv); 1111ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1112ef43aa38SMilan Broz } 1113ef43aa38SMilan Broz 1114ef43aa38SMilan Broz if (r == -EBADMSG) 1115ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1116ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*sector)); 1117ef43aa38SMilan Broz 1118ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1119ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1120ef43aa38SMilan Broz 1121ef43aa38SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); 1122ef43aa38SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); 1123ef43aa38SMilan Broz 1124ef43aa38SMilan Broz return r; 11253a7f6c99SMilan Broz } 11263a7f6c99SMilan Broz 1127ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1128ef43aa38SMilan Broz struct convert_context *ctx, 1129ef43aa38SMilan Broz struct skcipher_request *req, 1130ef43aa38SMilan Broz unsigned int tag_offset) 1131ef43aa38SMilan Broz { 1132ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1133ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1134ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1135ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1136ef43aa38SMilan Broz unsigned int data_len = 1 << SECTOR_SHIFT; 1137ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1138ef43aa38SMilan Broz uint64_t *sector; 1139ef43aa38SMilan Broz int r = 0; 1140ef43aa38SMilan Broz 1141ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1142ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 1143ef43aa38SMilan Broz dmreq->ctx = ctx; 1144ef43aa38SMilan Broz 1145ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1146ef43aa38SMilan Broz 1147ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1148ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1149ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1150ef43aa38SMilan Broz 1151ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1152ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1153ef43aa38SMilan Broz 1154ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1155ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1156ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1157ef43aa38SMilan Broz 1158ef43aa38SMilan Broz sg_init_table(sg_in, 1); 1159ef43aa38SMilan Broz sg_set_page(sg_in, bv_in.bv_page, data_len, bv_in.bv_offset); 1160ef43aa38SMilan Broz 1161ef43aa38SMilan Broz sg_init_table(sg_out, 1); 1162ef43aa38SMilan Broz sg_set_page(sg_out, bv_out.bv_page, data_len, bv_out.bv_offset); 1163ef43aa38SMilan Broz 1164ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1165ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1166ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1167ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1168ef43aa38SMilan Broz } else { 1169ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1170ef43aa38SMilan Broz if (r < 0) 1171ef43aa38SMilan Broz return r; 1172ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1173ef43aa38SMilan Broz if (cc->integrity_iv_size) 1174ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1175ef43aa38SMilan Broz } 1176ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1177ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1178ef43aa38SMilan Broz } 1179ef43aa38SMilan Broz 1180ef43aa38SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, data_len, iv); 11813a7f6c99SMilan Broz 11823a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1183bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 11843a7f6c99SMilan Broz else 1185bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 11863a7f6c99SMilan Broz 11872dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1188ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1189ef43aa38SMilan Broz 1190ef43aa38SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); 1191ef43aa38SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); 11922dc5327dSMilan Broz 11933a7f6c99SMilan Broz return r; 119401482b76SMilan Broz } 119501482b76SMilan Broz 119695497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 119795497a96SMilan Broz int error); 1198c0297721SAndi Kleen 1199ef43aa38SMilan Broz static void crypt_alloc_req_skcipher(struct crypt_config *cc, 1200ddd42edfSMilan Broz struct convert_context *ctx) 1201ddd42edfSMilan Broz { 1202c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1203c0297721SAndi Kleen 1204ef43aa38SMilan Broz if (!ctx->r.req) 1205ef43aa38SMilan Broz ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO); 1206c0297721SAndi Kleen 1207ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 120854cea3f6SMilan Broz 120954cea3f6SMilan Broz /* 121054cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 121154cea3f6SMilan Broz * requests if driver request queue is full. 121254cea3f6SMilan Broz */ 1213ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1214c0297721SAndi Kleen CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1215ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1216ddd42edfSMilan Broz } 1217ddd42edfSMilan Broz 1218ef43aa38SMilan Broz static void crypt_alloc_req_aead(struct crypt_config *cc, 1219ef43aa38SMilan Broz struct convert_context *ctx) 1220ef43aa38SMilan Broz { 1221ef43aa38SMilan Broz if (!ctx->r.req_aead) 1222ef43aa38SMilan Broz ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO); 1223ef43aa38SMilan Broz 1224ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1225ef43aa38SMilan Broz 1226ef43aa38SMilan Broz /* 1227ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1228ef43aa38SMilan Broz * requests if driver request queue is full. 1229ef43aa38SMilan Broz */ 1230ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1231ef43aa38SMilan Broz CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1232ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1233ef43aa38SMilan Broz } 1234ef43aa38SMilan Broz 1235ef43aa38SMilan Broz static void crypt_alloc_req(struct crypt_config *cc, 1236ef43aa38SMilan Broz struct convert_context *ctx) 1237ef43aa38SMilan Broz { 1238ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 1239ef43aa38SMilan Broz crypt_alloc_req_aead(cc, ctx); 1240ef43aa38SMilan Broz else 1241ef43aa38SMilan Broz crypt_alloc_req_skcipher(cc, ctx); 1242ef43aa38SMilan Broz } 1243ef43aa38SMilan Broz 1244ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1245bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1246298a9fa0SMikulas Patocka { 1247298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1248298a9fa0SMikulas Patocka 1249bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 1250298a9fa0SMikulas Patocka mempool_free(req, cc->req_pool); 1251298a9fa0SMikulas Patocka } 1252298a9fa0SMikulas Patocka 1253ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1254ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1255ef43aa38SMilan Broz { 1256ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1257ef43aa38SMilan Broz 1258ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 1259ef43aa38SMilan Broz mempool_free(req, cc->req_pool); 1260ef43aa38SMilan Broz } 1261ef43aa38SMilan Broz 1262ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1263ef43aa38SMilan Broz { 1264ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 1265ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1266ef43aa38SMilan Broz else 1267ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1268ef43aa38SMilan Broz } 1269ef43aa38SMilan Broz 12701da177e4SLinus Torvalds /* 12711da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 12721da177e4SLinus Torvalds */ 12731da177e4SLinus Torvalds static int crypt_convert(struct crypt_config *cc, 12741da177e4SLinus Torvalds struct convert_context *ctx) 12751da177e4SLinus Torvalds { 1276ef43aa38SMilan Broz unsigned int tag_offset = 0; 12773f1e9070SMilan Broz int r; 12781da177e4SLinus Torvalds 127940b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1280c8081618SMilan Broz 1281003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 12821da177e4SLinus Torvalds 12833a7f6c99SMilan Broz crypt_alloc_req(cc, ctx); 12843a7f6c99SMilan Broz 128540b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 12863f1e9070SMilan Broz 1287ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 1288ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1289ef43aa38SMilan Broz else 1290ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 12913a7f6c99SMilan Broz 12923a7f6c99SMilan Broz switch (r) { 129354cea3f6SMilan Broz /* 129454cea3f6SMilan Broz * The request was queued by a crypto driver 129554cea3f6SMilan Broz * but the driver request queue is full, let's wait. 129654cea3f6SMilan Broz */ 12973a7f6c99SMilan Broz case -EBUSY: 12983a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 129916735d02SWolfram Sang reinit_completion(&ctx->restart); 1300c0403ec0SRabin Vincent /* fall through */ 130154cea3f6SMilan Broz /* 130254cea3f6SMilan Broz * The request is queued and processed asynchronously, 130354cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 130454cea3f6SMilan Broz */ 1305c0403ec0SRabin Vincent case -EINPROGRESS: 1306ef43aa38SMilan Broz ctx->r.req = NULL; 1307c66029f4SMikulas Patocka ctx->cc_sector++; 1308ef43aa38SMilan Broz tag_offset++; 13093a7f6c99SMilan Broz continue; 131054cea3f6SMilan Broz /* 131154cea3f6SMilan Broz * The request was already processed (synchronously). 131254cea3f6SMilan Broz */ 13133f1e9070SMilan Broz case 0: 131440b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 1315c66029f4SMikulas Patocka ctx->cc_sector++; 1316ef43aa38SMilan Broz tag_offset++; 1317c7f1b204SMilan Broz cond_resched(); 13183f1e9070SMilan Broz continue; 1319ef43aa38SMilan Broz /* 1320ef43aa38SMilan Broz * There was a data integrity error. 1321ef43aa38SMilan Broz */ 1322ef43aa38SMilan Broz case -EBADMSG: 1323ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 1324ef43aa38SMilan Broz return -EILSEQ; 1325ef43aa38SMilan Broz /* 1326ef43aa38SMilan Broz * There was an error while processing the request. 1327ef43aa38SMilan Broz */ 13283f1e9070SMilan Broz default: 132940b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 1330ef43aa38SMilan Broz return -EIO; 13311da177e4SLinus Torvalds } 13323f1e9070SMilan Broz } 13333f1e9070SMilan Broz 13343f1e9070SMilan Broz return 0; 13353f1e9070SMilan Broz } 13361da177e4SLinus Torvalds 1337cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1338cf2f1abfSMikulas Patocka 13391da177e4SLinus Torvalds /* 13401da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1341586b286bSMike Snitzer * This should never violate the device limitations (but only because 1342586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 13437145c241SMikulas Patocka * 13447145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 13457145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 13467145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 13477145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 13487145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 13497145c241SMikulas Patocka * 13507145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 13517145c241SMikulas Patocka * 13527145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 13537145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 13547145c241SMikulas Patocka * to blocking allocations with a mutex. 13551da177e4SLinus Torvalds */ 1356cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 13571da177e4SLinus Torvalds { 135849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 13598b004457SMilan Broz struct bio *clone; 13601da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 13617145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 13627145c241SMikulas Patocka unsigned i, len, remaining_size; 136391e10625SMilan Broz struct page *page; 13641da177e4SLinus Torvalds 13657145c241SMikulas Patocka retry: 1366d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 13677145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 13687145c241SMikulas Patocka 13696a24c718SMilan Broz clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); 13708b004457SMilan Broz if (!clone) 1371ef43aa38SMilan Broz goto out; 13721da177e4SLinus Torvalds 1373027581f3SOlaf Kirch clone_init(io, clone); 13746a24c718SMilan Broz 13757145c241SMikulas Patocka remaining_size = size; 13767145c241SMikulas Patocka 1377f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 137891e10625SMilan Broz page = mempool_alloc(cc->page_pool, gfp_mask); 13797145c241SMikulas Patocka if (!page) { 13807145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 13817145c241SMikulas Patocka bio_put(clone); 1382d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 13837145c241SMikulas Patocka goto retry; 13847145c241SMikulas Patocka } 13851da177e4SLinus Torvalds 13867145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 13871da177e4SLinus Torvalds 13880dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 138991e10625SMilan Broz 13907145c241SMikulas Patocka remaining_size -= len; 13911da177e4SLinus Torvalds } 13921da177e4SLinus Torvalds 1393ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1394ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1395ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1396ef43aa38SMilan Broz bio_put(clone); 1397ef43aa38SMilan Broz clone = NULL; 1398ef43aa38SMilan Broz } 1399ef43aa38SMilan Broz out: 1400d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 14017145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 14027145c241SMikulas Patocka 14038b004457SMilan Broz return clone; 14041da177e4SLinus Torvalds } 14051da177e4SLinus Torvalds 1406644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 14071da177e4SLinus Torvalds { 1408644bd2f0SNeil Brown unsigned int i; 14091da177e4SLinus Torvalds struct bio_vec *bv; 14101da177e4SLinus Torvalds 1411cb34e057SKent Overstreet bio_for_each_segment_all(bv, clone, i) { 14121da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 14131da177e4SLinus Torvalds mempool_free(bv->bv_page, cc->page_pool); 14141da177e4SLinus Torvalds bv->bv_page = NULL; 14151da177e4SLinus Torvalds } 14161da177e4SLinus Torvalds } 14171da177e4SLinus Torvalds 1418298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1419dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1420dc440d1eSMilan Broz { 142149a8a920SAlasdair G Kergon io->cc = cc; 1422dc440d1eSMilan Broz io->base_bio = bio; 1423dc440d1eSMilan Broz io->sector = sector; 1424dc440d1eSMilan Broz io->error = 0; 1425ef43aa38SMilan Broz io->ctx.r.req = NULL; 1426ef43aa38SMilan Broz io->integrity_metadata = NULL; 1427ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 142840b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1429dc440d1eSMilan Broz } 1430dc440d1eSMilan Broz 14313e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 14323e1a8bddSMilan Broz { 143340b6229bSMikulas Patocka atomic_inc(&io->io_pending); 14343e1a8bddSMilan Broz } 14353e1a8bddSMilan Broz 14361da177e4SLinus Torvalds /* 14371da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 14381da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 14391da177e4SLinus Torvalds */ 14405742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 14411da177e4SLinus Torvalds { 144249a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1443b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 1444b35f8caaSMilan Broz int error = io->error; 14451da177e4SLinus Torvalds 144640b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 14471da177e4SLinus Torvalds return; 14481da177e4SLinus Torvalds 1449ef43aa38SMilan Broz if (io->ctx.r.req) 1450ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1451ef43aa38SMilan Broz 1452ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 1453ef43aa38SMilan Broz mempool_free(io->integrity_metadata, io->cc->tag_pool); 1454ef43aa38SMilan Broz else 1455ef43aa38SMilan Broz kfree(io->integrity_metadata); 1456b35f8caaSMilan Broz 14574246a0b6SChristoph Hellwig base_bio->bi_error = error; 14584246a0b6SChristoph Hellwig bio_endio(base_bio); 14591da177e4SLinus Torvalds } 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* 1462cabf08e4SMilan Broz * kcryptd/kcryptd_io: 14631da177e4SLinus Torvalds * 14641da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 146523541d2dSMilan Broz * interrupt context. 1466cabf08e4SMilan Broz * 1467cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1468cabf08e4SMilan Broz * 1469cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1470cabf08e4SMilan Broz * 1471cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1472cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1473cabf08e4SMilan Broz * to memory allocation. 1474c0297721SAndi Kleen * 1475c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1476c0297721SAndi Kleen * They should not depend on each other and do not block. 14771da177e4SLinus Torvalds */ 14784246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 14798b004457SMilan Broz { 1480028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 148149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1482ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 14839b81c842SSasha Levin int error; 14848b004457SMilan Broz 14858b004457SMilan Broz /* 14866712ecf8SNeilBrown * free the processed pages 14878b004457SMilan Broz */ 1488ee7a491eSMilan Broz if (rw == WRITE) 1489644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 14908b004457SMilan Broz 14919b81c842SSasha Levin error = clone->bi_error; 14928b004457SMilan Broz bio_put(clone); 1493ee7a491eSMilan Broz 14949b81c842SSasha Levin if (rw == READ && !error) { 1495cabf08e4SMilan Broz kcryptd_queue_crypt(io); 14966712ecf8SNeilBrown return; 1497ee7a491eSMilan Broz } 14985742fd77SMilan Broz 14999b81c842SSasha Levin if (unlikely(error)) 15009b81c842SSasha Levin io->error = error; 15015742fd77SMilan Broz 15025742fd77SMilan Broz crypt_dec_pending(io); 15038b004457SMilan Broz } 15048b004457SMilan Broz 1505028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 15068b004457SMilan Broz { 150749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15088b004457SMilan Broz 15098b004457SMilan Broz clone->bi_private = io; 15108b004457SMilan Broz clone->bi_end_io = crypt_endio; 15118b004457SMilan Broz clone->bi_bdev = cc->dev->bdev; 1512ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 15138b004457SMilan Broz } 15148b004457SMilan Broz 151520c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 15168b004457SMilan Broz { 151749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15188b004457SMilan Broz struct bio *clone; 151993e605c2SMilan Broz 15208b004457SMilan Broz /* 152159779079SMike Snitzer * We need the original biovec array in order to decrypt 152259779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 152359779079SMike Snitzer * biovecs we don't need to worry about the block layer 152459779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 15258b004457SMilan Broz */ 152659779079SMike Snitzer clone = bio_clone_fast(io->base_bio, gfp, cc->bs); 15277eaceaccSJens Axboe if (!clone) 152820c82538SMilan Broz return 1; 15298b004457SMilan Broz 153020c82538SMilan Broz crypt_inc_pending(io); 153120c82538SMilan Broz 15328b004457SMilan Broz clone_init(io, clone); 15334f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 15348b004457SMilan Broz 1535ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1536ef43aa38SMilan Broz crypt_dec_pending(io); 1537ef43aa38SMilan Broz bio_put(clone); 1538ef43aa38SMilan Broz return 1; 1539ef43aa38SMilan Broz } 1540ef43aa38SMilan Broz 154193e605c2SMilan Broz generic_make_request(clone); 154220c82538SMilan Broz return 0; 15438b004457SMilan Broz } 15448b004457SMilan Broz 1545dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1546395b167cSAlasdair G Kergon { 1547395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1548395b167cSAlasdair G Kergon 154920c82538SMilan Broz crypt_inc_pending(io); 155020c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 155120c82538SMilan Broz io->error = -ENOMEM; 155220c82538SMilan Broz crypt_dec_pending(io); 1553395b167cSAlasdair G Kergon } 1554395b167cSAlasdair G Kergon 1555dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1556395b167cSAlasdair G Kergon { 155749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1558395b167cSAlasdair G Kergon 1559dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1560395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1561395b167cSAlasdair G Kergon } 1562395b167cSAlasdair G Kergon 1563dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1564dc267621SMikulas Patocka { 1565dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1566dc267621SMikulas Patocka 1567dc267621SMikulas Patocka generic_make_request(clone); 1568dc267621SMikulas Patocka } 1569dc267621SMikulas Patocka 1570b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1571b3c5fd30SMikulas Patocka 1572dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1573dc267621SMikulas Patocka { 1574dc267621SMikulas Patocka struct crypt_config *cc = data; 1575b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1576b3c5fd30SMikulas Patocka 1577dc267621SMikulas Patocka while (1) { 1578b3c5fd30SMikulas Patocka struct rb_root write_tree; 1579dc267621SMikulas Patocka struct blk_plug plug; 1580dc267621SMikulas Patocka 1581dc267621SMikulas Patocka DECLARE_WAITQUEUE(wait, current); 1582dc267621SMikulas Patocka 1583dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1584dc267621SMikulas Patocka continue_locked: 1585dc267621SMikulas Patocka 1586b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1587dc267621SMikulas Patocka goto pop_from_list; 1588dc267621SMikulas Patocka 1589f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1590dc267621SMikulas Patocka __add_wait_queue(&cc->write_thread_wait, &wait); 1591dc267621SMikulas Patocka 1592dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1593dc267621SMikulas Patocka 1594f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1595642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1596f659b100SRabin Vincent remove_wait_queue(&cc->write_thread_wait, &wait); 1597f659b100SRabin Vincent break; 1598f659b100SRabin Vincent } 1599f659b100SRabin Vincent 1600dc267621SMikulas Patocka schedule(); 1601dc267621SMikulas Patocka 1602642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1603dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1604dc267621SMikulas Patocka __remove_wait_queue(&cc->write_thread_wait, &wait); 1605dc267621SMikulas Patocka goto continue_locked; 1606dc267621SMikulas Patocka 1607dc267621SMikulas Patocka pop_from_list: 1608b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1609b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1610dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1611dc267621SMikulas Patocka 1612b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1613b3c5fd30SMikulas Patocka 1614b3c5fd30SMikulas Patocka /* 1615b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1616b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1617b3c5fd30SMikulas Patocka */ 1618dc267621SMikulas Patocka blk_start_plug(&plug); 1619dc267621SMikulas Patocka do { 1620b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1621b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1622dc267621SMikulas Patocka kcryptd_io_write(io); 1623b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1624dc267621SMikulas Patocka blk_finish_plug(&plug); 1625dc267621SMikulas Patocka } 1626dc267621SMikulas Patocka return 0; 1627dc267621SMikulas Patocka } 1628dc267621SMikulas Patocka 162972c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 16304e4eef64SMilan Broz { 1631dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 163249a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1633dc267621SMikulas Patocka unsigned long flags; 1634b3c5fd30SMikulas Patocka sector_t sector; 1635b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1636dec1cedfSMilan Broz 163772c6e7afSMikulas Patocka if (unlikely(io->error < 0)) { 1638dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1639dec1cedfSMilan Broz bio_put(clone); 16406c031f41SMilan Broz crypt_dec_pending(io); 1641dec1cedfSMilan Broz return; 1642dec1cedfSMilan Broz } 1643dec1cedfSMilan Broz 1644dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1645003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1646dec1cedfSMilan Broz 16474f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1648899c95d3SMilan Broz 16490f5d8e6eSMikulas Patocka if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { 16500f5d8e6eSMikulas Patocka generic_make_request(clone); 16510f5d8e6eSMikulas Patocka return; 16520f5d8e6eSMikulas Patocka } 16530f5d8e6eSMikulas Patocka 1654dc267621SMikulas Patocka spin_lock_irqsave(&cc->write_thread_wait.lock, flags); 1655b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1656b3c5fd30SMikulas Patocka parent = NULL; 1657b3c5fd30SMikulas Patocka sector = io->sector; 1658b3c5fd30SMikulas Patocka while (*rbp) { 1659b3c5fd30SMikulas Patocka parent = *rbp; 1660b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1661b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1662b3c5fd30SMikulas Patocka else 1663b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1664b3c5fd30SMikulas Patocka } 1665b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1666b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1667b3c5fd30SMikulas Patocka 1668dc267621SMikulas Patocka wake_up_locked(&cc->write_thread_wait); 1669dc267621SMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); 16704e4eef64SMilan Broz } 16714e4eef64SMilan Broz 1672fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 16738b004457SMilan Broz { 167449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16758b004457SMilan Broz struct bio *clone; 1676c8081618SMilan Broz int crypt_finished; 1677b635b00eSMilan Broz sector_t sector = io->sector; 1678dec1cedfSMilan Broz int r; 16798b004457SMilan Broz 168093e605c2SMilan Broz /* 1681fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 1682fc5a5e9aSMilan Broz */ 1683fc5a5e9aSMilan Broz crypt_inc_pending(io); 1684b635b00eSMilan Broz crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); 1685fc5a5e9aSMilan Broz 1686cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 168723541d2dSMilan Broz if (unlikely(!clone)) { 1688cf2f1abfSMikulas Patocka io->error = -EIO; 1689cf2f1abfSMikulas Patocka goto dec; 169023541d2dSMilan Broz } 16918b004457SMilan Broz 169253017030SMilan Broz io->ctx.bio_out = clone; 1693003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 16948b004457SMilan Broz 1695b635b00eSMilan Broz sector += bio_sectors(clone); 1696dec1cedfSMilan Broz 16974e594098SMilan Broz crypt_inc_pending(io); 1698dec1cedfSMilan Broz r = crypt_convert(cc, &io->ctx); 1699ef43aa38SMilan Broz if (r < 0) 1700ef43aa38SMilan Broz io->error = r; 170140b6229bSMikulas Patocka crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); 1702dec1cedfSMilan Broz 1703c8081618SMilan Broz /* Encryption was already finished, submit io now */ 1704c8081618SMilan Broz if (crypt_finished) { 170572c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 1706b635b00eSMilan Broz io->sector = sector; 17074e594098SMilan Broz } 170893e605c2SMilan Broz 1709cf2f1abfSMikulas Patocka dec: 1710899c95d3SMilan Broz crypt_dec_pending(io); 171184131db6SMilan Broz } 171284131db6SMilan Broz 171372c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 17145742fd77SMilan Broz { 17155742fd77SMilan Broz crypt_dec_pending(io); 17165742fd77SMilan Broz } 17175742fd77SMilan Broz 17184e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 17198b004457SMilan Broz { 172049a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 17215742fd77SMilan Broz int r = 0; 17228b004457SMilan Broz 17233e1a8bddSMilan Broz crypt_inc_pending(io); 17243a7f6c99SMilan Broz 172553017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 17260c395b0fSMilan Broz io->sector); 17278b004457SMilan Broz 17285742fd77SMilan Broz r = crypt_convert(cc, &io->ctx); 172972c6e7afSMikulas Patocka if (r < 0) 1730ef43aa38SMilan Broz io->error = r; 17315742fd77SMilan Broz 173240b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 173372c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 17343a7f6c99SMilan Broz 17353a7f6c99SMilan Broz crypt_dec_pending(io); 17368b004457SMilan Broz } 17378b004457SMilan Broz 173895497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 173995497a96SMilan Broz int error) 174095497a96SMilan Broz { 1741b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 1742b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 174395497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 174449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 174595497a96SMilan Broz 174654cea3f6SMilan Broz /* 174754cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 174854cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 174954cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 175054cea3f6SMilan Broz */ 1751c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 1752c0403ec0SRabin Vincent complete(&ctx->restart); 175395497a96SMilan Broz return; 1754c0403ec0SRabin Vincent } 175595497a96SMilan Broz 17562dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 1757ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 17582dc5327dSMilan Broz 1759ef43aa38SMilan Broz if (error == -EBADMSG) { 1760ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1761ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); 1762ef43aa38SMilan Broz io->error = -EILSEQ; 1763ef43aa38SMilan Broz } else if (error < 0) 176472c6e7afSMikulas Patocka io->error = -EIO; 176572c6e7afSMikulas Patocka 1766298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 176795497a96SMilan Broz 176840b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 1769c0403ec0SRabin Vincent return; 177095497a96SMilan Broz 177195497a96SMilan Broz if (bio_data_dir(io->base_bio) == READ) 177272c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 177395497a96SMilan Broz else 177472c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 177595497a96SMilan Broz } 177695497a96SMilan Broz 17774e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 17784e4eef64SMilan Broz { 17794e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 17804e4eef64SMilan Broz 17814e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 17824e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 17834e4eef64SMilan Broz else 17844e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 17858b004457SMilan Broz } 17868b004457SMilan Broz 1787395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 1788395b167cSAlasdair G Kergon { 178949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1790395b167cSAlasdair G Kergon 1791395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 1792395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 1793395b167cSAlasdair G Kergon } 1794395b167cSAlasdair G Kergon 17951da177e4SLinus Torvalds /* 17961da177e4SLinus Torvalds * Decode key from its hex representation 17971da177e4SLinus Torvalds */ 17981da177e4SLinus Torvalds static int crypt_decode_key(u8 *key, char *hex, unsigned int size) 17991da177e4SLinus Torvalds { 18001da177e4SLinus Torvalds char buffer[3]; 18011da177e4SLinus Torvalds unsigned int i; 18021da177e4SLinus Torvalds 18031da177e4SLinus Torvalds buffer[2] = '\0'; 18041da177e4SLinus Torvalds 18051da177e4SLinus Torvalds for (i = 0; i < size; i++) { 18061da177e4SLinus Torvalds buffer[0] = *hex++; 18071da177e4SLinus Torvalds buffer[1] = *hex++; 18081da177e4SLinus Torvalds 18091a66a08aSmajianpeng if (kstrtou8(buffer, 16, &key[i])) 18101da177e4SLinus Torvalds return -EINVAL; 18111da177e4SLinus Torvalds } 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds if (*hex != '\0') 18141da177e4SLinus Torvalds return -EINVAL; 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds return 0; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 1819ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 1820ef43aa38SMilan Broz { 1821ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 1822ef43aa38SMilan Broz return; 1823ef43aa38SMilan Broz 1824ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1825ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 1826ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 1827ef43aa38SMilan Broz } 1828ef43aa38SMilan Broz 1829ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 1830ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 1831ef43aa38SMilan Broz } 1832ef43aa38SMilan Broz 1833ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 1834d1f96423SMilan Broz { 1835d1f96423SMilan Broz unsigned i; 1836d1f96423SMilan Broz 1837ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1838fd2d231fSMikulas Patocka return; 1839fd2d231fSMikulas Patocka 1840d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 1841ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 1842ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 1843ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 1844d1f96423SMilan Broz } 1845d1f96423SMilan Broz 1846ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 1847ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 1848fd2d231fSMikulas Patocka } 1849fd2d231fSMikulas Patocka 1850ef43aa38SMilan Broz static void crypt_free_tfms(struct crypt_config *cc) 1851ef43aa38SMilan Broz { 1852ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 1853ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 1854ef43aa38SMilan Broz else 1855ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 1856ef43aa38SMilan Broz } 1857ef43aa38SMilan Broz 1858ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 1859d1f96423SMilan Broz { 1860d1f96423SMilan Broz unsigned i; 1861d1f96423SMilan Broz int err; 1862d1f96423SMilan Broz 1863ef43aa38SMilan Broz cc->cipher_tfm.tfms = kzalloc(cc->tfms_count * 1864ef43aa38SMilan Broz sizeof(struct crypto_skcipher *), GFP_KERNEL); 1865ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1866fd2d231fSMikulas Patocka return -ENOMEM; 1867fd2d231fSMikulas Patocka 1868d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1869ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); 1870ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 1871ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 1872fd2d231fSMikulas Patocka crypt_free_tfms(cc); 1873d1f96423SMilan Broz return err; 1874d1f96423SMilan Broz } 1875d1f96423SMilan Broz } 1876d1f96423SMilan Broz 1877d1f96423SMilan Broz return 0; 1878d1f96423SMilan Broz } 1879d1f96423SMilan Broz 1880ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 1881ef43aa38SMilan Broz { 1882ef43aa38SMilan Broz char *authenc = NULL; 1883ef43aa38SMilan Broz int err; 1884ef43aa38SMilan Broz 1885ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 1886ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1887ef43aa38SMilan Broz return -ENOMEM; 1888ef43aa38SMilan Broz 1889ef43aa38SMilan Broz /* Compose AEAD cipher with autenc(authenticator,cipher) structure */ 1890ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) { 1891ef43aa38SMilan Broz authenc = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 1892ef43aa38SMilan Broz if (!authenc) 1893ef43aa38SMilan Broz return -ENOMEM; 1894ef43aa38SMilan Broz err = snprintf(authenc, CRYPTO_MAX_ALG_NAME, 1895ef43aa38SMilan Broz "authenc(%s,%s)", cc->cipher_auth, ciphermode); 1896ef43aa38SMilan Broz if (err < 0) { 1897ef43aa38SMilan Broz kzfree(authenc); 1898ef43aa38SMilan Broz return err; 1899ef43aa38SMilan Broz } 1900ef43aa38SMilan Broz ciphermode = authenc; 1901ef43aa38SMilan Broz } 1902ef43aa38SMilan Broz 1903ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); 1904ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1905ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 1906ef43aa38SMilan Broz crypt_free_tfms(cc); 1907ef43aa38SMilan Broz return err; 1908ef43aa38SMilan Broz } 1909ef43aa38SMilan Broz 1910ef43aa38SMilan Broz kzfree(authenc); 1911ef43aa38SMilan Broz return 0; 1912ef43aa38SMilan Broz } 1913ef43aa38SMilan Broz 1914ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 1915ef43aa38SMilan Broz { 1916ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 1917ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 1918ef43aa38SMilan Broz else 1919ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 1920ef43aa38SMilan Broz } 1921ef43aa38SMilan Broz 1922ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 1923ef43aa38SMilan Broz { 1924ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 1925ef43aa38SMilan Broz } 1926ef43aa38SMilan Broz 1927ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 1928ef43aa38SMilan Broz { 1929ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 1930ef43aa38SMilan Broz } 1931ef43aa38SMilan Broz 1932ef43aa38SMilan Broz /* 1933ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 1934ef43aa38SMilan Broz * the key must be for some reason in special format. 1935ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 1936ef43aa38SMilan Broz */ 1937ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 1938ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 1939ef43aa38SMilan Broz { 1940ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 1941ef43aa38SMilan Broz struct rtattr *rta; 1942ef43aa38SMilan Broz 1943ef43aa38SMilan Broz rta = (struct rtattr *)p; 1944ef43aa38SMilan Broz param = RTA_DATA(rta); 1945ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 1946ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 1947ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 1948ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 1949ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 1950ef43aa38SMilan Broz p += authkeylen; 1951ef43aa38SMilan Broz memcpy(p, key, enckeylen); 1952ef43aa38SMilan Broz } 1953ef43aa38SMilan Broz 1954671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 1955c0297721SAndi Kleen { 1956da31a078SMilan Broz unsigned subkey_size; 1957fd2d231fSMikulas Patocka int err = 0, i, r; 1958c0297721SAndi Kleen 1959da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 1960ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 1961da31a078SMilan Broz 1962ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1963ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 1964ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 1965ef43aa38SMilan Broz cc->key_mac_size); 1966d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1967ef43aa38SMilan Broz if (crypt_integrity_aead(cc)) 1968ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 1969ef43aa38SMilan Broz cc->key + (i * subkey_size), 1970ef43aa38SMilan Broz subkey_size); 1971ef43aa38SMilan Broz else if (crypt_integrity_hmac(cc)) 1972ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 1973ef43aa38SMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 1974ef43aa38SMilan Broz else 1975ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 1976fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 1977fd2d231fSMikulas Patocka subkey_size); 1978c0297721SAndi Kleen if (r) 1979c0297721SAndi Kleen err = r; 1980c0297721SAndi Kleen } 1981c0297721SAndi Kleen 1982ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1983ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 1984ef43aa38SMilan Broz 1985c0297721SAndi Kleen return err; 1986c0297721SAndi Kleen } 1987c0297721SAndi Kleen 1988c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 1989c538f6ecSOndrej Kozina 1990027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 1991027c431cSOndrej Kozina { 1992027c431cSOndrej Kozina while (*str) 1993027c431cSOndrej Kozina if (isspace(*str++)) 1994027c431cSOndrej Kozina return true; 1995027c431cSOndrej Kozina return false; 1996027c431cSOndrej Kozina } 1997027c431cSOndrej Kozina 1998c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 1999c538f6ecSOndrej Kozina { 2000c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 2001c538f6ecSOndrej Kozina int ret; 2002c538f6ecSOndrej Kozina struct key *key; 2003c538f6ecSOndrej Kozina const struct user_key_payload *ukp; 2004c538f6ecSOndrej Kozina 2005027c431cSOndrej Kozina /* 2006027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 2007027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2008027c431cSOndrej Kozina */ 2009027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 2010027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 2011027c431cSOndrej Kozina return -EINVAL; 2012027c431cSOndrej Kozina } 2013027c431cSOndrej Kozina 2014c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 2015c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 2016c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2017c538f6ecSOndrej Kozina return -EINVAL; 2018c538f6ecSOndrej Kozina 2019c538f6ecSOndrej Kozina if (strncmp(key_string, "logon:", key_desc - key_string + 1) && 2020c538f6ecSOndrej Kozina strncmp(key_string, "user:", key_desc - key_string + 1)) 2021c538f6ecSOndrej Kozina return -EINVAL; 2022c538f6ecSOndrej Kozina 2023c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2024c538f6ecSOndrej Kozina if (!new_key_string) 2025c538f6ecSOndrej Kozina return -ENOMEM; 2026c538f6ecSOndrej Kozina 2027c538f6ecSOndrej Kozina key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user, 2028c538f6ecSOndrej Kozina key_desc + 1, NULL); 2029c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2030c538f6ecSOndrej Kozina kzfree(new_key_string); 2031c538f6ecSOndrej Kozina return PTR_ERR(key); 2032c538f6ecSOndrej Kozina } 2033c538f6ecSOndrej Kozina 2034f5b0cba8SOndrej Kozina down_read(&key->sem); 2035c538f6ecSOndrej Kozina 20360837e49aSDavid Howells ukp = user_key_payload_locked(key); 2037c538f6ecSOndrej Kozina if (!ukp) { 2038f5b0cba8SOndrej Kozina up_read(&key->sem); 2039c538f6ecSOndrej Kozina key_put(key); 2040c538f6ecSOndrej Kozina kzfree(new_key_string); 2041c538f6ecSOndrej Kozina return -EKEYREVOKED; 2042c538f6ecSOndrej Kozina } 2043c538f6ecSOndrej Kozina 2044c538f6ecSOndrej Kozina if (cc->key_size != ukp->datalen) { 2045f5b0cba8SOndrej Kozina up_read(&key->sem); 2046c538f6ecSOndrej Kozina key_put(key); 2047c538f6ecSOndrej Kozina kzfree(new_key_string); 2048c538f6ecSOndrej Kozina return -EINVAL; 2049c538f6ecSOndrej Kozina } 2050c538f6ecSOndrej Kozina 2051c538f6ecSOndrej Kozina memcpy(cc->key, ukp->data, cc->key_size); 2052c538f6ecSOndrej Kozina 2053f5b0cba8SOndrej Kozina up_read(&key->sem); 2054c538f6ecSOndrej Kozina key_put(key); 2055c538f6ecSOndrej Kozina 2056c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2057c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2058c538f6ecSOndrej Kozina 2059c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2060c538f6ecSOndrej Kozina 2061c538f6ecSOndrej Kozina /* wipe the kernel key payload copy in each case */ 2062c538f6ecSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 2063c538f6ecSOndrej Kozina 2064c538f6ecSOndrej Kozina if (!ret) { 2065c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2066c538f6ecSOndrej Kozina kzfree(cc->key_string); 2067c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2068c538f6ecSOndrej Kozina } else 2069c538f6ecSOndrej Kozina kzfree(new_key_string); 2070c538f6ecSOndrej Kozina 2071c538f6ecSOndrej Kozina return ret; 2072c538f6ecSOndrej Kozina } 2073c538f6ecSOndrej Kozina 2074c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2075c538f6ecSOndrej Kozina { 2076c538f6ecSOndrej Kozina char *colon, dummy; 2077c538f6ecSOndrej Kozina int ret; 2078c538f6ecSOndrej Kozina 2079c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2080c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2081c538f6ecSOndrej Kozina 2082c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2083c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2084c538f6ecSOndrej Kozina if (!colon) 2085c538f6ecSOndrej Kozina return -EINVAL; 2086c538f6ecSOndrej Kozina 2087c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2088c538f6ecSOndrej Kozina return -EINVAL; 2089c538f6ecSOndrej Kozina 2090c538f6ecSOndrej Kozina *key_string = colon; 2091c538f6ecSOndrej Kozina 2092c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2093c538f6ecSOndrej Kozina 2094c538f6ecSOndrej Kozina return ret; 2095c538f6ecSOndrej Kozina } 2096c538f6ecSOndrej Kozina 2097c538f6ecSOndrej Kozina #else 2098c538f6ecSOndrej Kozina 2099c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2100c538f6ecSOndrej Kozina { 2101c538f6ecSOndrej Kozina return -EINVAL; 2102c538f6ecSOndrej Kozina } 2103c538f6ecSOndrej Kozina 2104c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2105c538f6ecSOndrej Kozina { 2106c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2107c538f6ecSOndrej Kozina } 2108c538f6ecSOndrej Kozina 2109c538f6ecSOndrej Kozina #endif 2110c538f6ecSOndrej Kozina 2111e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2112e48d4bbfSMilan Broz { 2113de8be5acSMilan Broz int r = -EINVAL; 2114de8be5acSMilan Broz int key_string_len = strlen(key); 2115de8be5acSMilan Broz 211669a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 211769a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2118de8be5acSMilan Broz goto out; 2119e48d4bbfSMilan Broz 2120c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2121c538f6ecSOndrej Kozina if (key[0] == ':') { 2122c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2123c538f6ecSOndrej Kozina goto out; 2124c538f6ecSOndrej Kozina } 2125c538f6ecSOndrej Kozina 2126265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2127265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2128265e9098SOndrej Kozina 2129c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2130c538f6ecSOndrej Kozina kzfree(cc->key_string); 2131c538f6ecSOndrej Kozina cc->key_string = NULL; 2132c538f6ecSOndrej Kozina 213369a8cfcdSMilan Broz if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) 2134de8be5acSMilan Broz goto out; 2135e48d4bbfSMilan Broz 2136671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2137265e9098SOndrej Kozina if (!r) 2138e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2139e48d4bbfSMilan Broz 2140de8be5acSMilan Broz out: 2141de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2142de8be5acSMilan Broz memset(key, '0', key_string_len); 2143de8be5acSMilan Broz 2144de8be5acSMilan Broz return r; 2145e48d4bbfSMilan Broz } 2146e48d4bbfSMilan Broz 2147e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2148e48d4bbfSMilan Broz { 2149e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2150e48d4bbfSMilan Broz memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2151c538f6ecSOndrej Kozina kzfree(cc->key_string); 2152c538f6ecSOndrej Kozina cc->key_string = NULL; 2153c0297721SAndi Kleen 2154671ea6b4SMikulas Patocka return crypt_setkey(cc); 2155e48d4bbfSMilan Broz } 2156e48d4bbfSMilan Broz 215728513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 215828513fccSMilan Broz { 215928513fccSMilan Broz struct crypt_config *cc = ti->private; 216028513fccSMilan Broz 216128513fccSMilan Broz ti->private = NULL; 216228513fccSMilan Broz 216328513fccSMilan Broz if (!cc) 216428513fccSMilan Broz return; 216528513fccSMilan Broz 2166f659b100SRabin Vincent if (cc->write_thread) 2167dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2168dc267621SMikulas Patocka 216928513fccSMilan Broz if (cc->io_queue) 217028513fccSMilan Broz destroy_workqueue(cc->io_queue); 217128513fccSMilan Broz if (cc->crypt_queue) 217228513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 217328513fccSMilan Broz 2174fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2175fd2d231fSMikulas Patocka 217628513fccSMilan Broz if (cc->bs) 217728513fccSMilan Broz bioset_free(cc->bs); 217828513fccSMilan Broz 217928513fccSMilan Broz mempool_destroy(cc->page_pool); 218028513fccSMilan Broz mempool_destroy(cc->req_pool); 2181ef43aa38SMilan Broz mempool_destroy(cc->tag_pool); 218228513fccSMilan Broz 218328513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 218428513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 218528513fccSMilan Broz 218628513fccSMilan Broz if (cc->dev) 218728513fccSMilan Broz dm_put_device(ti, cc->dev); 218828513fccSMilan Broz 21895ebaee6dSMilan Broz kzfree(cc->cipher); 21907dbcd137SMilan Broz kzfree(cc->cipher_string); 2191c538f6ecSOndrej Kozina kzfree(cc->key_string); 2192ef43aa38SMilan Broz kzfree(cc->cipher_auth); 2193ef43aa38SMilan Broz kzfree(cc->authenc_key); 219428513fccSMilan Broz 219528513fccSMilan Broz /* Must zero key material before freeing */ 219628513fccSMilan Broz kzfree(cc); 219728513fccSMilan Broz } 219828513fccSMilan Broz 21995ebaee6dSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, 22005ebaee6dSMilan Broz char *cipher_in, char *key) 22011da177e4SLinus Torvalds { 22025ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2203d1f96423SMilan Broz char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; 22045ebaee6dSMilan Broz char *cipher_api = NULL; 2205fd2d231fSMikulas Patocka int ret = -EINVAL; 220631998ef1SMikulas Patocka char dummy; 22071da177e4SLinus Torvalds 22085ebaee6dSMilan Broz /* Convert to crypto api definition? */ 22095ebaee6dSMilan Broz if (strchr(cipher_in, '(')) { 22105ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 22111da177e4SLinus Torvalds return -EINVAL; 22121da177e4SLinus Torvalds } 22131da177e4SLinus Torvalds 22147dbcd137SMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 22157dbcd137SMilan Broz if (!cc->cipher_string) 22167dbcd137SMilan Broz goto bad_mem; 22177dbcd137SMilan Broz 22185ebaee6dSMilan Broz /* 22195ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 2220d1f96423SMilan Broz * cipher[:keycount]-mode-iv:ivopts 22215ebaee6dSMilan Broz */ 22225ebaee6dSMilan Broz tmp = cipher_in; 2223d1f96423SMilan Broz keycount = strsep(&tmp, "-"); 2224d1f96423SMilan Broz cipher = strsep(&keycount, ":"); 2225d1f96423SMilan Broz 2226d1f96423SMilan Broz if (!keycount) 2227d1f96423SMilan Broz cc->tfms_count = 1; 222831998ef1SMikulas Patocka else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 2229d1f96423SMilan Broz !is_power_of_2(cc->tfms_count)) { 2230d1f96423SMilan Broz ti->error = "Bad cipher key count specification"; 2231d1f96423SMilan Broz return -EINVAL; 2232d1f96423SMilan Broz } 2233d1f96423SMilan Broz cc->key_parts = cc->tfms_count; 22345ebaee6dSMilan Broz 22355ebaee6dSMilan Broz cc->cipher = kstrdup(cipher, GFP_KERNEL); 22365ebaee6dSMilan Broz if (!cc->cipher) 22375ebaee6dSMilan Broz goto bad_mem; 22385ebaee6dSMilan Broz 22391da177e4SLinus Torvalds chainmode = strsep(&tmp, "-"); 22401da177e4SLinus Torvalds ivopts = strsep(&tmp, "-"); 22411da177e4SLinus Torvalds ivmode = strsep(&ivopts, ":"); 22421da177e4SLinus Torvalds 22431da177e4SLinus Torvalds if (tmp) 22445ebaee6dSMilan Broz DMWARN("Ignoring unexpected additional cipher options"); 22451da177e4SLinus Torvalds 22467dbcd137SMilan Broz /* 22477dbcd137SMilan Broz * For compatibility with the original dm-crypt mapping format, if 22487dbcd137SMilan Broz * only the cipher name is supplied, use cbc-plain. 22497dbcd137SMilan Broz */ 22505ebaee6dSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { 22511da177e4SLinus Torvalds chainmode = "cbc"; 22521da177e4SLinus Torvalds ivmode = "plain"; 22531da177e4SLinus Torvalds } 22541da177e4SLinus Torvalds 2255d1806f6aSHerbert Xu if (strcmp(chainmode, "ecb") && !ivmode) { 22565ebaee6dSMilan Broz ti->error = "IV mechanism required"; 22575ebaee6dSMilan Broz return -EINVAL; 22581da177e4SLinus Torvalds } 22591da177e4SLinus Torvalds 22605ebaee6dSMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 22615ebaee6dSMilan Broz if (!cipher_api) 22625ebaee6dSMilan Broz goto bad_mem; 22635ebaee6dSMilan Broz 22645ebaee6dSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 22655ebaee6dSMilan Broz "%s(%s)", chainmode, cipher); 22665ebaee6dSMilan Broz if (ret < 0) { 22675ebaee6dSMilan Broz kfree(cipher_api); 22685ebaee6dSMilan Broz goto bad_mem; 2269d1806f6aSHerbert Xu } 2270d1806f6aSHerbert Xu 22715ebaee6dSMilan Broz /* Allocate cipher */ 2272fd2d231fSMikulas Patocka ret = crypt_alloc_tfms(cc, cipher_api); 2273d1f96423SMilan Broz if (ret < 0) { 227472d94861SAlasdair G Kergon ti->error = "Error allocating crypto tfm"; 227528513fccSMilan Broz goto bad; 22761da177e4SLinus Torvalds } 22771da177e4SLinus Torvalds 22785ebaee6dSMilan Broz /* Initialize IV */ 2279ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 2280ef43aa38SMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2281ef43aa38SMilan Broz else 2282bbdb23b5SHerbert Xu cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2283ef43aa38SMilan Broz 2284ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) { 2285ef43aa38SMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 2286ef43aa38SMilan Broz if (!cc->authenc_key) { 2287ef43aa38SMilan Broz ret = -ENOMEM; 2288ef43aa38SMilan Broz ti->error = "Error allocating authenc key space"; 2289ef43aa38SMilan Broz goto bad; 2290ef43aa38SMilan Broz } 2291ef43aa38SMilan Broz } 2292ef43aa38SMilan Broz 22935ebaee6dSMilan Broz if (cc->iv_size) 22945ebaee6dSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 22955ebaee6dSMilan Broz cc->iv_size = max(cc->iv_size, 22965ebaee6dSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 22975ebaee6dSMilan Broz else if (ivmode) { 22985ebaee6dSMilan Broz DMWARN("Selected cipher does not support IVs"); 22995ebaee6dSMilan Broz ivmode = NULL; 23005ebaee6dSMilan Broz } 23015ebaee6dSMilan Broz 23025ebaee6dSMilan Broz /* Choose ivmode, see comments at iv code. */ 23031da177e4SLinus Torvalds if (ivmode == NULL) 23041da177e4SLinus Torvalds cc->iv_gen_ops = NULL; 23051da177e4SLinus Torvalds else if (strcmp(ivmode, "plain") == 0) 23061da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_plain_ops; 230761afef61SMilan Broz else if (strcmp(ivmode, "plain64") == 0) 230861afef61SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 23091da177e4SLinus Torvalds else if (strcmp(ivmode, "essiv") == 0) 23101da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_essiv_ops; 231148527fa7SRik Snel else if (strcmp(ivmode, "benbi") == 0) 231248527fa7SRik Snel cc->iv_gen_ops = &crypt_iv_benbi_ops; 231346b47730SLudwig Nussel else if (strcmp(ivmode, "null") == 0) 231446b47730SLudwig Nussel cc->iv_gen_ops = &crypt_iv_null_ops; 231534745785SMilan Broz else if (strcmp(ivmode, "lmk") == 0) { 231634745785SMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2317ed04d981SMilan Broz /* 2318ed04d981SMilan Broz * Version 2 and 3 is recognised according 231934745785SMilan Broz * to length of provided multi-key string. 232034745785SMilan Broz * If present (version 3), last key is used as IV seed. 2321ed04d981SMilan Broz * All keys (including IV seed) are always the same size. 232234745785SMilan Broz */ 2323da31a078SMilan Broz if (cc->key_size % cc->key_parts) { 232434745785SMilan Broz cc->key_parts++; 2325da31a078SMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2326da31a078SMilan Broz } 2327ed04d981SMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2328ed04d981SMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2329ed04d981SMilan Broz cc->key_parts += 2; /* IV + whitening */ 2330ed04d981SMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2331ef43aa38SMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2332ef43aa38SMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2333ef43aa38SMilan Broz /* Need storage space in integrity fields. */ 2334ef43aa38SMilan Broz cc->integrity_iv_size = cc->iv_size; 233534745785SMilan Broz } else { 23365ebaee6dSMilan Broz ret = -EINVAL; 233772d94861SAlasdair G Kergon ti->error = "Invalid IV mode"; 233828513fccSMilan Broz goto bad; 23391da177e4SLinus Torvalds } 23401da177e4SLinus Torvalds 2341da31a078SMilan Broz /* Initialize and set key */ 2342da31a078SMilan Broz ret = crypt_set_key(cc, key); 2343da31a078SMilan Broz if (ret < 0) { 2344da31a078SMilan Broz ti->error = "Error decoding and setting key"; 2345da31a078SMilan Broz goto bad; 2346da31a078SMilan Broz } 2347da31a078SMilan Broz 234828513fccSMilan Broz /* Allocate IV */ 234928513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 235028513fccSMilan Broz ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 235128513fccSMilan Broz if (ret < 0) { 235228513fccSMilan Broz ti->error = "Error creating IV"; 235328513fccSMilan Broz goto bad; 235428513fccSMilan Broz } 235528513fccSMilan Broz } 23561da177e4SLinus Torvalds 235728513fccSMilan Broz /* Initialize IV (set keys for ESSIV etc) */ 235828513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 235928513fccSMilan Broz ret = cc->iv_gen_ops->init(cc); 236028513fccSMilan Broz if (ret < 0) { 2361b95bf2d3SMilan Broz ti->error = "Error initialising IV"; 236228513fccSMilan Broz goto bad; 236328513fccSMilan Broz } 2364b95bf2d3SMilan Broz } 2365b95bf2d3SMilan Broz 23665ebaee6dSMilan Broz ret = 0; 23675ebaee6dSMilan Broz bad: 23685ebaee6dSMilan Broz kfree(cipher_api); 23695ebaee6dSMilan Broz return ret; 23705ebaee6dSMilan Broz 23715ebaee6dSMilan Broz bad_mem: 23725ebaee6dSMilan Broz ti->error = "Cannot allocate cipher strings"; 23735ebaee6dSMilan Broz return -ENOMEM; 23741da177e4SLinus Torvalds } 23755ebaee6dSMilan Broz 2376ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 2377ef43aa38SMilan Broz { 2378ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 2379ef43aa38SMilan Broz struct dm_arg_set as; 2380ef43aa38SMilan Broz static struct dm_arg _args[] = { 2381ef43aa38SMilan Broz {0, 3, "Invalid number of feature args"}, 2382ef43aa38SMilan Broz }; 2383ef43aa38SMilan Broz unsigned int opt_params, val; 2384ef43aa38SMilan Broz const char *opt_string, *sval; 2385ef43aa38SMilan Broz int ret; 2386ef43aa38SMilan Broz 2387ef43aa38SMilan Broz /* Optional parameters */ 2388ef43aa38SMilan Broz as.argc = argc; 2389ef43aa38SMilan Broz as.argv = argv; 2390ef43aa38SMilan Broz 2391ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 2392ef43aa38SMilan Broz if (ret) 2393ef43aa38SMilan Broz return ret; 2394ef43aa38SMilan Broz 2395ef43aa38SMilan Broz while (opt_params--) { 2396ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 2397ef43aa38SMilan Broz if (!opt_string) { 2398ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 2399ef43aa38SMilan Broz return -EINVAL; 2400ef43aa38SMilan Broz } 2401ef43aa38SMilan Broz 2402ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 2403ef43aa38SMilan Broz ti->num_discard_bios = 1; 2404ef43aa38SMilan Broz 2405ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 2406ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 2407ef43aa38SMilan Broz 2408ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 2409ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2410ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 2411ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 2412ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 2413ef43aa38SMilan Broz return -EINVAL; 2414ef43aa38SMilan Broz } 2415ef43aa38SMilan Broz cc->on_disk_tag_size = val; 2416ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 2417ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 2418ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 2419ef43aa38SMilan Broz } else if (!strncasecmp(sval, "hmac(", strlen("hmac("))) { 2420ef43aa38SMilan Broz struct crypto_ahash *hmac_tfm = crypto_alloc_ahash(sval, 0, 0); 2421ef43aa38SMilan Broz if (IS_ERR(hmac_tfm)) { 2422ef43aa38SMilan Broz ti->error = "Error initializing HMAC integrity hash."; 2423ef43aa38SMilan Broz return PTR_ERR(hmac_tfm); 2424ef43aa38SMilan Broz } 2425ef43aa38SMilan Broz cc->key_mac_size = crypto_ahash_digestsize(hmac_tfm); 2426ef43aa38SMilan Broz crypto_free_ahash(hmac_tfm); 2427ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_HMAC, &cc->cipher_flags); 2428ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 2429ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 2430ef43aa38SMilan Broz return -EINVAL; 2431ef43aa38SMilan Broz } 2432ef43aa38SMilan Broz 2433ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 2434ef43aa38SMilan Broz if (!cc->cipher_auth) 2435ef43aa38SMilan Broz return -ENOMEM; 2436ef43aa38SMilan Broz } else { 2437ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 2438ef43aa38SMilan Broz return -EINVAL; 2439ef43aa38SMilan Broz } 2440ef43aa38SMilan Broz } 2441ef43aa38SMilan Broz 2442ef43aa38SMilan Broz return 0; 2443ef43aa38SMilan Broz } 2444ef43aa38SMilan Broz 24455ebaee6dSMilan Broz /* 24465ebaee6dSMilan Broz * Construct an encryption mapping: 2447c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 24485ebaee6dSMilan Broz */ 24495ebaee6dSMilan Broz static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 24505ebaee6dSMilan Broz { 24515ebaee6dSMilan Broz struct crypt_config *cc; 2452c538f6ecSOndrej Kozina int key_size; 2453ef43aa38SMilan Broz unsigned int align_mask; 24545ebaee6dSMilan Broz unsigned long long tmpll; 24555ebaee6dSMilan Broz int ret; 2456ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 245731998ef1SMikulas Patocka char dummy; 24585ebaee6dSMilan Broz 2459772ae5f5SMilan Broz if (argc < 5) { 24605ebaee6dSMilan Broz ti->error = "Not enough arguments"; 24615ebaee6dSMilan Broz return -EINVAL; 24621da177e4SLinus Torvalds } 24631da177e4SLinus Torvalds 2464c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 2465c538f6ecSOndrej Kozina if (key_size < 0) { 2466c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 2467c538f6ecSOndrej Kozina return -EINVAL; 2468c538f6ecSOndrej Kozina } 24695ebaee6dSMilan Broz 24705ebaee6dSMilan Broz cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); 24715ebaee6dSMilan Broz if (!cc) { 24725ebaee6dSMilan Broz ti->error = "Cannot allocate encryption context"; 24735ebaee6dSMilan Broz return -ENOMEM; 24745ebaee6dSMilan Broz } 247569a8cfcdSMilan Broz cc->key_size = key_size; 24765ebaee6dSMilan Broz 24775ebaee6dSMilan Broz ti->private = cc; 2478ef43aa38SMilan Broz 2479ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 2480ef43aa38SMilan Broz if (argc > 5) { 2481ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 2482ef43aa38SMilan Broz if (ret) 2483ef43aa38SMilan Broz goto bad; 2484ef43aa38SMilan Broz } 2485ef43aa38SMilan Broz 24865ebaee6dSMilan Broz ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 24875ebaee6dSMilan Broz if (ret < 0) 24885ebaee6dSMilan Broz goto bad; 24895ebaee6dSMilan Broz 2490ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) { 2491ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 2492ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 2493ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 2494ef43aa38SMilan Broz } else { 2495bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 2496bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 2497ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 2498ef43aa38SMilan Broz } 2499d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 2500d49ec52fSMikulas Patocka 2501ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 2502d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 2503d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 2504ef43aa38SMilan Broz & align_mask; 2505d49ec52fSMikulas Patocka } else { 2506d49ec52fSMikulas Patocka /* 2507d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 2508d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 2509d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 2510d49ec52fSMikulas Patocka */ 2511ef43aa38SMilan Broz iv_size_padding = align_mask; 2512d49ec52fSMikulas Patocka } 2513ddd42edfSMilan Broz 251494f5e024SMikulas Patocka ret = -ENOMEM; 2515ef43aa38SMilan Broz 2516ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 2517ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 2518ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 2519ef43aa38SMilan Broz cc->iv_size + 2520ef43aa38SMilan Broz sizeof(uint64_t) + 2521ef43aa38SMilan Broz sizeof(unsigned int); 2522ef43aa38SMilan Broz 2523ef43aa38SMilan Broz cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size); 2524ddd42edfSMilan Broz if (!cc->req_pool) { 2525ddd42edfSMilan Broz ti->error = "Cannot allocate crypt request mempool"; 252628513fccSMilan Broz goto bad; 2527ddd42edfSMilan Broz } 2528ddd42edfSMilan Broz 252930187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 2530ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 2531d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 2532298a9fa0SMikulas Patocka 2533cf2f1abfSMikulas Patocka cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); 25341da177e4SLinus Torvalds if (!cc->page_pool) { 253572d94861SAlasdair G Kergon ti->error = "Cannot allocate page mempool"; 253628513fccSMilan Broz goto bad; 25371da177e4SLinus Torvalds } 25381da177e4SLinus Torvalds 2539bb799ca0SJens Axboe cc->bs = bioset_create(MIN_IOS, 0); 25406a24c718SMilan Broz if (!cc->bs) { 25416a24c718SMilan Broz ti->error = "Cannot allocate crypt bioset"; 254228513fccSMilan Broz goto bad; 25436a24c718SMilan Broz } 25446a24c718SMilan Broz 25457145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 25467145c241SMikulas Patocka 254728513fccSMilan Broz ret = -EINVAL; 254831998ef1SMikulas Patocka if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { 254972d94861SAlasdair G Kergon ti->error = "Invalid iv_offset sector"; 255028513fccSMilan Broz goto bad; 25511da177e4SLinus Torvalds } 25524ee218cdSAndrew Morton cc->iv_offset = tmpll; 25531da177e4SLinus Torvalds 2554e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 2555e80d1c80SVivek Goyal if (ret) { 255628513fccSMilan Broz ti->error = "Device lookup failed"; 255728513fccSMilan Broz goto bad; 255828513fccSMilan Broz } 255928513fccSMilan Broz 2560e80d1c80SVivek Goyal ret = -EINVAL; 256131998ef1SMikulas Patocka if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { 256272d94861SAlasdair G Kergon ti->error = "Invalid device sector"; 256328513fccSMilan Broz goto bad; 25641da177e4SLinus Torvalds } 25654ee218cdSAndrew Morton cc->start = tmpll; 25661da177e4SLinus Torvalds 2567ef43aa38SMilan Broz if (crypt_integrity_mode(cc) || cc->integrity_iv_size) { 2568ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 2569772ae5f5SMilan Broz if (ret) 2570772ae5f5SMilan Broz goto bad; 2571772ae5f5SMilan Broz 2572ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 2573ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 2574ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 2575ef43aa38SMilan Broz 2576ef43aa38SMilan Broz cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS, 2577ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 2578ef43aa38SMilan Broz if (!cc->tag_pool) { 2579ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 2580f3396c58SMikulas Patocka goto bad; 2581f3396c58SMikulas Patocka } 2582f3396c58SMikulas Patocka } 2583772ae5f5SMilan Broz 258428513fccSMilan Broz ret = -ENOMEM; 2585670368a8STejun Heo cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); 2586cabf08e4SMilan Broz if (!cc->io_queue) { 2587cabf08e4SMilan Broz ti->error = "Couldn't create kcryptd io queue"; 258828513fccSMilan Broz goto bad; 2589cabf08e4SMilan Broz } 2590cabf08e4SMilan Broz 2591f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2592f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); 2593f3396c58SMikulas Patocka else 2594f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 2595f3396c58SMikulas Patocka num_online_cpus()); 2596cabf08e4SMilan Broz if (!cc->crypt_queue) { 25979934a8beSMilan Broz ti->error = "Couldn't create kcryptd queue"; 259828513fccSMilan Broz goto bad; 25999934a8beSMilan Broz } 26009934a8beSMilan Broz 2601dc267621SMikulas Patocka init_waitqueue_head(&cc->write_thread_wait); 2602b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 2603dc267621SMikulas Patocka 2604dc267621SMikulas Patocka cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); 2605dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 2606dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 2607dc267621SMikulas Patocka cc->write_thread = NULL; 2608dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 2609dc267621SMikulas Patocka goto bad; 2610dc267621SMikulas Patocka } 2611dc267621SMikulas Patocka wake_up_process(cc->write_thread); 2612dc267621SMikulas Patocka 261355a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 26140ac55489SAlasdair G Kergon ti->discard_zeroes_data_unsupported = true; 2615983c7db3SMilan Broz 26161da177e4SLinus Torvalds return 0; 26171da177e4SLinus Torvalds 261828513fccSMilan Broz bad: 261928513fccSMilan Broz crypt_dtr(ti); 262028513fccSMilan Broz return ret; 26211da177e4SLinus Torvalds } 26221da177e4SLinus Torvalds 26237de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 26241da177e4SLinus Torvalds { 2625028867acSAlasdair G Kergon struct dm_crypt_io *io; 262649a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 2627647c7db1SMikulas Patocka 2628772ae5f5SMilan Broz /* 262928a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 263028a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 2631e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 2632772ae5f5SMilan Broz */ 26331eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 263428a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 2635647c7db1SMikulas Patocka bio->bi_bdev = cc->dev->bdev; 2636772ae5f5SMilan Broz if (bio_sectors(bio)) 26374f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 26384f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 2639647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 2640647c7db1SMikulas Patocka } 26411da177e4SLinus Torvalds 26424e870e94SMikulas Patocka /* 26434e870e94SMikulas Patocka * Check if bio is too large, split as needed. 26444e870e94SMikulas Patocka */ 26454e870e94SMikulas Patocka if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && 2646ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 26474e870e94SMikulas Patocka dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); 26484e870e94SMikulas Patocka 2649298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 2650298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 2651ef43aa38SMilan Broz 2652ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 2653ef43aa38SMilan Broz unsigned tag_len = cc->on_disk_tag_size * bio_sectors(bio); 2654ef43aa38SMilan Broz 2655ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 2656ef43aa38SMilan Broz unlikely(!(io->integrity_metadata = kmalloc(tag_len, 2657ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 2658ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 2659ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 2660ef43aa38SMilan Broz io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO); 2661ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 2662ef43aa38SMilan Broz } 2663ef43aa38SMilan Broz } 2664ef43aa38SMilan Broz 2665ef43aa38SMilan Broz if (crypt_integrity_mode(cc)) 2666ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 2667ef43aa38SMilan Broz else 2668ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 2669cabf08e4SMilan Broz 267020c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 267120c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 2672dc267621SMikulas Patocka kcryptd_queue_read(io); 267320c82538SMilan Broz } else 2674cabf08e4SMilan Broz kcryptd_queue_crypt(io); 26751da177e4SLinus Torvalds 2676d2a7ad29SKiyoshi Ueda return DM_MAPIO_SUBMITTED; 26771da177e4SLinus Torvalds } 26781da177e4SLinus Torvalds 2679fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 26801f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 26811da177e4SLinus Torvalds { 26825ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2683fd7c092eSMikulas Patocka unsigned i, sz = 0; 2684f3396c58SMikulas Patocka int num_feature_args = 0; 26851da177e4SLinus Torvalds 26861da177e4SLinus Torvalds switch (type) { 26871da177e4SLinus Torvalds case STATUSTYPE_INFO: 26881da177e4SLinus Torvalds result[0] = '\0'; 26891da177e4SLinus Torvalds break; 26901da177e4SLinus Torvalds 26911da177e4SLinus Torvalds case STATUSTYPE_TABLE: 26927dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 26931da177e4SLinus Torvalds 2694c538f6ecSOndrej Kozina if (cc->key_size > 0) { 2695c538f6ecSOndrej Kozina if (cc->key_string) 2696c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 2697c538f6ecSOndrej Kozina else 2698fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 2699fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 2700c538f6ecSOndrej Kozina } else 2701fd7c092eSMikulas Patocka DMEMIT("-"); 27021da177e4SLinus Torvalds 27034ee218cdSAndrew Morton DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 27044ee218cdSAndrew Morton cc->dev->name, (unsigned long long)cc->start); 2705772ae5f5SMilan Broz 2706f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 2707f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 27080f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2709ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2710ef43aa38SMilan Broz num_feature_args++; 2711f3396c58SMikulas Patocka if (num_feature_args) { 2712f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 271355a62eefSAlasdair G Kergon if (ti->num_discard_bios) 2714f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 2715f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2716f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 27170f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 27180f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 2719ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2720ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 2721f3396c58SMikulas Patocka } 2722772ae5f5SMilan Broz 27231da177e4SLinus Torvalds break; 27241da177e4SLinus Torvalds } 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 2727e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 2728e48d4bbfSMilan Broz { 2729e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2730e48d4bbfSMilan Broz 2731e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2732e48d4bbfSMilan Broz } 2733e48d4bbfSMilan Broz 2734e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 2735e48d4bbfSMilan Broz { 2736e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2737e48d4bbfSMilan Broz 2738e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 2739e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 2740e48d4bbfSMilan Broz return -EAGAIN; 2741e48d4bbfSMilan Broz } 2742e48d4bbfSMilan Broz 2743e48d4bbfSMilan Broz return 0; 2744e48d4bbfSMilan Broz } 2745e48d4bbfSMilan Broz 2746e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 2747e48d4bbfSMilan Broz { 2748e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2749e48d4bbfSMilan Broz 2750e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2751e48d4bbfSMilan Broz } 2752e48d4bbfSMilan Broz 2753e48d4bbfSMilan Broz /* Message interface 2754e48d4bbfSMilan Broz * key set <key> 2755e48d4bbfSMilan Broz * key wipe 2756e48d4bbfSMilan Broz */ 2757e48d4bbfSMilan Broz static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) 2758e48d4bbfSMilan Broz { 2759e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2760c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 2761e48d4bbfSMilan Broz 2762e48d4bbfSMilan Broz if (argc < 2) 2763e48d4bbfSMilan Broz goto error; 2764e48d4bbfSMilan Broz 2765498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 2766e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 2767e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 2768e48d4bbfSMilan Broz return -EINVAL; 2769e48d4bbfSMilan Broz } 2770498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 2771c538f6ecSOndrej Kozina /* The key size may not be changed. */ 2772c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 2773c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 2774c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 2775c538f6ecSOndrej Kozina return -EINVAL; 2776c538f6ecSOndrej Kozina } 2777c538f6ecSOndrej Kozina 2778542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 2779542da317SMilan Broz if (ret) 2780542da317SMilan Broz return ret; 2781542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 2782542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 2783542da317SMilan Broz return ret; 2784542da317SMilan Broz } 2785498f0103SMike Snitzer if (argc == 2 && !strcasecmp(argv[1], "wipe")) { 2786542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 2787542da317SMilan Broz ret = cc->iv_gen_ops->wipe(cc); 2788542da317SMilan Broz if (ret) 2789542da317SMilan Broz return ret; 2790542da317SMilan Broz } 2791e48d4bbfSMilan Broz return crypt_wipe_key(cc); 2792e48d4bbfSMilan Broz } 2793542da317SMilan Broz } 2794e48d4bbfSMilan Broz 2795e48d4bbfSMilan Broz error: 2796e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 2797e48d4bbfSMilan Broz return -EINVAL; 2798e48d4bbfSMilan Broz } 2799e48d4bbfSMilan Broz 2800af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 2801af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 2802af4874e0SMike Snitzer { 2803af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 2804af4874e0SMike Snitzer 28055dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 2806af4874e0SMike Snitzer } 2807af4874e0SMike Snitzer 2808586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 2809586b286bSMike Snitzer { 2810586b286bSMike Snitzer /* 2811586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 2812586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 2813586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 2814586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 2815586b286bSMike Snitzer */ 2816586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 2817586b286bSMike Snitzer } 2818586b286bSMike Snitzer 28191da177e4SLinus Torvalds static struct target_type crypt_target = { 28201da177e4SLinus Torvalds .name = "crypt", 2821ef43aa38SMilan Broz .version = {1, 16, 0}, 28221da177e4SLinus Torvalds .module = THIS_MODULE, 28231da177e4SLinus Torvalds .ctr = crypt_ctr, 28241da177e4SLinus Torvalds .dtr = crypt_dtr, 28251da177e4SLinus Torvalds .map = crypt_map, 28261da177e4SLinus Torvalds .status = crypt_status, 2827e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 2828e48d4bbfSMilan Broz .preresume = crypt_preresume, 2829e48d4bbfSMilan Broz .resume = crypt_resume, 2830e48d4bbfSMilan Broz .message = crypt_message, 2831af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 2832586b286bSMike Snitzer .io_hints = crypt_io_hints, 28331da177e4SLinus Torvalds }; 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds static int __init dm_crypt_init(void) 28361da177e4SLinus Torvalds { 28371da177e4SLinus Torvalds int r; 28381da177e4SLinus Torvalds 28391da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 284094f5e024SMikulas Patocka if (r < 0) 284172d94861SAlasdair G Kergon DMERR("register failed %d", r); 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds return r; 28441da177e4SLinus Torvalds } 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 28471da177e4SLinus Torvalds { 284810d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 28491da177e4SLinus Torvalds } 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds module_init(dm_crypt_init); 28521da177e4SLinus Torvalds module_exit(dm_crypt_exit); 28531da177e4SLinus Torvalds 2854bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 28551da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 28561da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2857