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 }; 133ef43aa38SMilan Broz 134c0297721SAndi Kleen /* 135610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 136c0297721SAndi Kleen */ 1371da177e4SLinus Torvalds struct crypt_config { 1381da177e4SLinus Torvalds struct dm_dev *dev; 1391da177e4SLinus Torvalds sector_t start; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* 142ef43aa38SMilan Broz * pool for per bio private data, crypto requests, 143ef43aa38SMilan Broz * encryption requeusts/buffer pages and integrity tags 1441da177e4SLinus Torvalds */ 145ddd42edfSMilan Broz mempool_t *req_pool; 1461da177e4SLinus Torvalds mempool_t *page_pool; 147ef43aa38SMilan Broz mempool_t *tag_pool; 148ef43aa38SMilan Broz unsigned tag_pool_max_sectors; 149ef43aa38SMilan Broz 1506a24c718SMilan Broz struct bio_set *bs; 1517145c241SMikulas Patocka struct mutex bio_alloc_lock; 1521da177e4SLinus Torvalds 153cabf08e4SMilan Broz struct workqueue_struct *io_queue; 154cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1553f1e9070SMilan Broz 156dc267621SMikulas Patocka struct task_struct *write_thread; 157dc267621SMikulas Patocka wait_queue_head_t write_thread_wait; 158b3c5fd30SMikulas Patocka struct rb_root write_tree; 159dc267621SMikulas Patocka 1605ebaee6dSMilan Broz char *cipher; 1617dbcd137SMilan Broz char *cipher_string; 162ef43aa38SMilan Broz char *cipher_auth; 163c538f6ecSOndrej Kozina char *key_string; 1645ebaee6dSMilan Broz 1651b1b58f5SJulia Lawall const struct crypt_iv_operations *iv_gen_ops; 16679066ad3SHerbert Xu union { 16760473592SMilan Broz struct iv_essiv_private essiv; 16860473592SMilan Broz struct iv_benbi_private benbi; 16934745785SMilan Broz struct iv_lmk_private lmk; 170ed04d981SMilan Broz struct iv_tcw_private tcw; 17179066ad3SHerbert Xu } iv_gen_private; 1721da177e4SLinus Torvalds sector_t iv_offset; 1731da177e4SLinus Torvalds unsigned int iv_size; 1741da177e4SLinus Torvalds 175fd2d231fSMikulas Patocka /* ESSIV: struct crypto_cipher *essiv_tfm */ 176fd2d231fSMikulas Patocka void *iv_private; 177ef43aa38SMilan Broz union { 178bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 179ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 180ef43aa38SMilan Broz } cipher_tfm; 181d1f96423SMilan Broz unsigned tfms_count; 182ef43aa38SMilan Broz unsigned long cipher_flags; 183c0297721SAndi Kleen 184c0297721SAndi Kleen /* 185ddd42edfSMilan Broz * Layout of each crypto request: 186ddd42edfSMilan Broz * 187bbdb23b5SHerbert Xu * struct skcipher_request 188ddd42edfSMilan Broz * context 189ddd42edfSMilan Broz * padding 190ddd42edfSMilan Broz * struct dm_crypt_request 191ddd42edfSMilan Broz * padding 192ddd42edfSMilan Broz * IV 193ddd42edfSMilan Broz * 194ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 195ddd42edfSMilan Broz * correctly aligned. 196ddd42edfSMilan Broz */ 197ddd42edfSMilan Broz unsigned int dmreq_start; 198ddd42edfSMilan Broz 199298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 200298a9fa0SMikulas Patocka 201e48d4bbfSMilan Broz unsigned long flags; 2021da177e4SLinus Torvalds unsigned int key_size; 203da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 204da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 205ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 206ef43aa38SMilan Broz 207ef43aa38SMilan Broz unsigned int integrity_tag_size; 208ef43aa38SMilan Broz unsigned int integrity_iv_size; 209ef43aa38SMilan Broz unsigned int on_disk_tag_size; 210ef43aa38SMilan Broz 211ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 2121da177e4SLinus Torvalds u8 key[0]; 2131da177e4SLinus Torvalds }; 2141da177e4SLinus Torvalds 2150a83df6cSMikulas Patocka #define MIN_IOS 64 216ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 217ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2181da177e4SLinus Torvalds 219028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 220395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 221ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 222ef43aa38SMilan Broz struct scatterlist *sg); 223027581f3SOlaf Kirch 224c0297721SAndi Kleen /* 225c0297721SAndi Kleen * Use this to access cipher attributes that are the same for each CPU. 226c0297721SAndi Kleen */ 227bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 228c0297721SAndi Kleen { 229ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 230ef43aa38SMilan Broz } 231ef43aa38SMilan Broz 232ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 233ef43aa38SMilan Broz { 234ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 235c0297721SAndi Kleen } 236c0297721SAndi Kleen 2371da177e4SLinus Torvalds /* 2381da177e4SLinus Torvalds * Different IV generation algorithms: 2391da177e4SLinus Torvalds * 2403c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2413a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2421da177e4SLinus Torvalds * 24361afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 24461afef61SMilan Broz * number, padded with zeros if necessary. 24561afef61SMilan Broz * 2463c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2471da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2481da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2491da177e4SLinus Torvalds * 25048527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 25148527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 25248527fa7SRik Snel * 25346b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 25446b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 25546b47730SLudwig Nussel * 25634745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 25734745785SMilan Broz * by the Loop-AES block device encryption system 25834745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 25934745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 26034745785SMilan Broz * with an IV derived from the sector number, the data and 26134745785SMilan Broz * optionally extra IV seed. 26234745785SMilan Broz * This means that after decryption the first block 26334745785SMilan Broz * of sector must be tweaked according to decrypted data. 26434745785SMilan Broz * Loop-AES can use three encryption schemes: 26534745785SMilan Broz * version 1: is plain aes-cbc mode 26634745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 26734745785SMilan Broz * version 3: the same as version 2 with additional IV seed 26834745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 26934745785SMilan Broz * 270ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 271ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 272e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 273ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 274ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 275ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 276ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 277ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 278ed04d981SMilan Broz * and should be used for old compatible containers access only. 279ed04d981SMilan Broz * 2801da177e4SLinus Torvalds * plumb: unimplemented, see: 2811da177e4SLinus Torvalds * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 2821da177e4SLinus Torvalds */ 2831da177e4SLinus Torvalds 2842dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 2852dc5327dSMilan Broz struct dm_crypt_request *dmreq) 2861da177e4SLinus Torvalds { 2871da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 288283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds return 0; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 29361afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 2942dc5327dSMilan Broz struct dm_crypt_request *dmreq) 29561afef61SMilan Broz { 29661afef61SMilan Broz memset(iv, 0, cc->iv_size); 297283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 29861afef61SMilan Broz 29961afef61SMilan Broz return 0; 30061afef61SMilan Broz } 30161afef61SMilan Broz 302b95bf2d3SMilan Broz /* Initialise ESSIV - compute salt but no local memory allocations */ 303b95bf2d3SMilan Broz static int crypt_iv_essiv_init(struct crypt_config *cc) 304b95bf2d3SMilan Broz { 305b95bf2d3SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 306bbdb23b5SHerbert Xu AHASH_REQUEST_ON_STACK(req, essiv->hash_tfm); 307b95bf2d3SMilan Broz struct scatterlist sg; 308c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 309fd2d231fSMikulas Patocka int err; 310b95bf2d3SMilan Broz 311b95bf2d3SMilan Broz sg_init_one(&sg, cc->key, cc->key_size); 312bbdb23b5SHerbert Xu ahash_request_set_tfm(req, essiv->hash_tfm); 313bbdb23b5SHerbert Xu ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); 314bbdb23b5SHerbert Xu ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size); 315b95bf2d3SMilan Broz 316bbdb23b5SHerbert Xu err = crypto_ahash_digest(req); 317bbdb23b5SHerbert Xu ahash_request_zero(req); 318b95bf2d3SMilan Broz if (err) 319b95bf2d3SMilan Broz return err; 320b95bf2d3SMilan Broz 321fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 322c0297721SAndi Kleen 323c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, essiv->salt, 324bbdb23b5SHerbert Xu crypto_ahash_digestsize(essiv->hash_tfm)); 325c0297721SAndi Kleen if (err) 326c0297721SAndi Kleen return err; 327c0297721SAndi Kleen 328c0297721SAndi Kleen return 0; 329b95bf2d3SMilan Broz } 330b95bf2d3SMilan Broz 331542da317SMilan Broz /* Wipe salt and reset key derived from volume key */ 332542da317SMilan Broz static int crypt_iv_essiv_wipe(struct crypt_config *cc) 333542da317SMilan Broz { 334542da317SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 335bbdb23b5SHerbert Xu unsigned salt_size = crypto_ahash_digestsize(essiv->hash_tfm); 336c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 337fd2d231fSMikulas Patocka int r, err = 0; 338542da317SMilan Broz 339542da317SMilan Broz memset(essiv->salt, 0, salt_size); 340542da317SMilan Broz 341fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 342c0297721SAndi Kleen r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); 343c0297721SAndi Kleen if (r) 344c0297721SAndi Kleen err = r; 345c0297721SAndi Kleen 346c0297721SAndi Kleen return err; 347c0297721SAndi Kleen } 348c0297721SAndi Kleen 349c0297721SAndi Kleen /* Set up per cpu cipher state */ 350c0297721SAndi Kleen static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, 351c0297721SAndi Kleen struct dm_target *ti, 352c0297721SAndi Kleen u8 *salt, unsigned saltsize) 353c0297721SAndi Kleen { 354c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 355c0297721SAndi Kleen int err; 356c0297721SAndi Kleen 357c0297721SAndi Kleen /* Setup the essiv_tfm with the given salt */ 358c0297721SAndi Kleen essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); 359c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 360c0297721SAndi Kleen ti->error = "Error allocating crypto tfm for ESSIV"; 361c0297721SAndi Kleen return essiv_tfm; 362c0297721SAndi Kleen } 363c0297721SAndi Kleen 364ef43aa38SMilan Broz if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { 365c0297721SAndi Kleen ti->error = "Block size of ESSIV cipher does " 366c0297721SAndi Kleen "not match IV size of block cipher"; 367c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 368c0297721SAndi Kleen return ERR_PTR(-EINVAL); 369c0297721SAndi Kleen } 370c0297721SAndi Kleen 371c0297721SAndi Kleen err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); 372c0297721SAndi Kleen if (err) { 373c0297721SAndi Kleen ti->error = "Failed to set key for ESSIV cipher"; 374c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 375c0297721SAndi Kleen return ERR_PTR(err); 376c0297721SAndi Kleen } 377c0297721SAndi Kleen 378c0297721SAndi Kleen return essiv_tfm; 379542da317SMilan Broz } 380542da317SMilan Broz 38160473592SMilan Broz static void crypt_iv_essiv_dtr(struct crypt_config *cc) 38260473592SMilan Broz { 383c0297721SAndi Kleen struct crypto_cipher *essiv_tfm; 38460473592SMilan Broz struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; 38560473592SMilan Broz 386bbdb23b5SHerbert Xu crypto_free_ahash(essiv->hash_tfm); 387b95bf2d3SMilan Broz essiv->hash_tfm = NULL; 388b95bf2d3SMilan Broz 389b95bf2d3SMilan Broz kzfree(essiv->salt); 390b95bf2d3SMilan Broz essiv->salt = NULL; 391c0297721SAndi Kleen 392fd2d231fSMikulas Patocka essiv_tfm = cc->iv_private; 393c0297721SAndi Kleen 394c0297721SAndi Kleen if (essiv_tfm) 395c0297721SAndi Kleen crypto_free_cipher(essiv_tfm); 396c0297721SAndi Kleen 397fd2d231fSMikulas Patocka cc->iv_private = NULL; 39860473592SMilan Broz } 39960473592SMilan Broz 4001da177e4SLinus Torvalds static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, 4011da177e4SLinus Torvalds const char *opts) 4021da177e4SLinus Torvalds { 4035861f1beSMilan Broz struct crypto_cipher *essiv_tfm = NULL; 404bbdb23b5SHerbert Xu struct crypto_ahash *hash_tfm = NULL; 4055861f1beSMilan Broz u8 *salt = NULL; 406fd2d231fSMikulas Patocka int err; 4071da177e4SLinus Torvalds 4085861f1beSMilan Broz if (!opts) { 40972d94861SAlasdair G Kergon ti->error = "Digest algorithm missing for ESSIV mode"; 4101da177e4SLinus Torvalds return -EINVAL; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 413b95bf2d3SMilan Broz /* Allocate hash algorithm */ 414bbdb23b5SHerbert Xu hash_tfm = crypto_alloc_ahash(opts, 0, CRYPTO_ALG_ASYNC); 41535058687SHerbert Xu if (IS_ERR(hash_tfm)) { 41672d94861SAlasdair G Kergon ti->error = "Error initializing ESSIV hash"; 4175861f1beSMilan Broz err = PTR_ERR(hash_tfm); 4185861f1beSMilan Broz goto bad; 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 421bbdb23b5SHerbert Xu salt = kzalloc(crypto_ahash_digestsize(hash_tfm), GFP_KERNEL); 4225861f1beSMilan Broz if (!salt) { 42372d94861SAlasdair G Kergon ti->error = "Error kmallocing salt storage in ESSIV"; 4245861f1beSMilan Broz err = -ENOMEM; 4255861f1beSMilan Broz goto bad; 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 428b95bf2d3SMilan Broz cc->iv_gen_private.essiv.salt = salt; 429b95bf2d3SMilan Broz cc->iv_gen_private.essiv.hash_tfm = hash_tfm; 430b95bf2d3SMilan Broz 431c0297721SAndi Kleen essiv_tfm = setup_essiv_cpu(cc, ti, salt, 432bbdb23b5SHerbert Xu crypto_ahash_digestsize(hash_tfm)); 433ef43aa38SMilan Broz 434c0297721SAndi Kleen if (IS_ERR(essiv_tfm)) { 435c0297721SAndi Kleen crypt_iv_essiv_dtr(cc); 436c0297721SAndi Kleen return PTR_ERR(essiv_tfm); 437c0297721SAndi Kleen } 438fd2d231fSMikulas Patocka cc->iv_private = essiv_tfm; 439c0297721SAndi Kleen 4401da177e4SLinus Torvalds return 0; 4415861f1beSMilan Broz 4425861f1beSMilan Broz bad: 4435861f1beSMilan Broz if (hash_tfm && !IS_ERR(hash_tfm)) 444bbdb23b5SHerbert Xu crypto_free_ahash(hash_tfm); 445b95bf2d3SMilan Broz kfree(salt); 4465861f1beSMilan Broz return err; 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4492dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 4502dc5327dSMilan Broz struct dm_crypt_request *dmreq) 4511da177e4SLinus Torvalds { 452fd2d231fSMikulas Patocka struct crypto_cipher *essiv_tfm = cc->iv_private; 453c0297721SAndi Kleen 4541da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 455283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 456c0297721SAndi Kleen crypto_cipher_encrypt_one(essiv_tfm, iv, iv); 457c0297721SAndi Kleen 4581da177e4SLinus Torvalds return 0; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 46148527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 46248527fa7SRik Snel const char *opts) 46348527fa7SRik Snel { 464bbdb23b5SHerbert Xu unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); 465f0d1b0b3SDavid Howells int log = ilog2(bs); 46648527fa7SRik Snel 46748527fa7SRik Snel /* we need to calculate how far we must shift the sector count 46848527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 46948527fa7SRik Snel 47048527fa7SRik Snel if (1 << log != bs) { 47148527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 47248527fa7SRik Snel return -EINVAL; 47348527fa7SRik Snel } 47448527fa7SRik Snel 47548527fa7SRik Snel if (log > 9) { 47648527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 47748527fa7SRik Snel return -EINVAL; 47848527fa7SRik Snel } 47948527fa7SRik Snel 48060473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 48148527fa7SRik Snel 48248527fa7SRik Snel return 0; 48348527fa7SRik Snel } 48448527fa7SRik Snel 48548527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 48648527fa7SRik Snel { 48748527fa7SRik Snel } 48848527fa7SRik Snel 4892dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 4902dc5327dSMilan Broz struct dm_crypt_request *dmreq) 49148527fa7SRik Snel { 49279066ad3SHerbert Xu __be64 val; 49379066ad3SHerbert Xu 49448527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 49579066ad3SHerbert Xu 4962dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 49779066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 49848527fa7SRik Snel 4991da177e4SLinus Torvalds return 0; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5022dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 5032dc5327dSMilan Broz struct dm_crypt_request *dmreq) 50446b47730SLudwig Nussel { 50546b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 50646b47730SLudwig Nussel 50746b47730SLudwig Nussel return 0; 50846b47730SLudwig Nussel } 50946b47730SLudwig Nussel 51034745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 51134745785SMilan Broz { 51234745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 51334745785SMilan Broz 51434745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 51534745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 51634745785SMilan Broz lmk->hash_tfm = NULL; 51734745785SMilan Broz 51834745785SMilan Broz kzfree(lmk->seed); 51934745785SMilan Broz lmk->seed = NULL; 52034745785SMilan Broz } 52134745785SMilan Broz 52234745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 52334745785SMilan Broz const char *opts) 52434745785SMilan Broz { 52534745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 52634745785SMilan Broz 52734745785SMilan Broz lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); 52834745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 52934745785SMilan Broz ti->error = "Error initializing LMK hash"; 53034745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 53134745785SMilan Broz } 53234745785SMilan Broz 53334745785SMilan Broz /* No seed in LMK version 2 */ 53434745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 53534745785SMilan Broz lmk->seed = NULL; 53634745785SMilan Broz return 0; 53734745785SMilan Broz } 53834745785SMilan Broz 53934745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 54034745785SMilan Broz if (!lmk->seed) { 54134745785SMilan Broz crypt_iv_lmk_dtr(cc); 54234745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 54334745785SMilan Broz return -ENOMEM; 54434745785SMilan Broz } 54534745785SMilan Broz 54634745785SMilan Broz return 0; 54734745785SMilan Broz } 54834745785SMilan Broz 54934745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 55034745785SMilan Broz { 55134745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 55234745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 55334745785SMilan Broz 55434745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 55534745785SMilan Broz if (lmk->seed) 55634745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 55734745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 55834745785SMilan Broz 55934745785SMilan Broz return 0; 56034745785SMilan Broz } 56134745785SMilan Broz 56234745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 56334745785SMilan Broz { 56434745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 56534745785SMilan Broz 56634745785SMilan Broz if (lmk->seed) 56734745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 56834745785SMilan Broz 56934745785SMilan Broz return 0; 57034745785SMilan Broz } 57134745785SMilan Broz 57234745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 57334745785SMilan Broz struct dm_crypt_request *dmreq, 57434745785SMilan Broz u8 *data) 57534745785SMilan Broz { 57634745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 577b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 57834745785SMilan Broz struct md5_state md5state; 579da31a078SMilan Broz __le32 buf[4]; 58034745785SMilan Broz int i, r; 58134745785SMilan Broz 582b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 583b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 58434745785SMilan Broz 585b6106265SJan-Simon Möller r = crypto_shash_init(desc); 58634745785SMilan Broz if (r) 58734745785SMilan Broz return r; 58834745785SMilan Broz 58934745785SMilan Broz if (lmk->seed) { 590b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 59134745785SMilan Broz if (r) 59234745785SMilan Broz return r; 59334745785SMilan Broz } 59434745785SMilan Broz 59534745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 596b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 59734745785SMilan Broz if (r) 59834745785SMilan Broz return r; 59934745785SMilan Broz 60034745785SMilan Broz /* Sector is cropped to 56 bits here */ 60134745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 60234745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 60334745785SMilan Broz buf[2] = cpu_to_le32(4024); 60434745785SMilan Broz buf[3] = 0; 605b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 60634745785SMilan Broz if (r) 60734745785SMilan Broz return r; 60834745785SMilan Broz 60934745785SMilan Broz /* No MD5 padding here */ 610b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 61134745785SMilan Broz if (r) 61234745785SMilan Broz return r; 61334745785SMilan Broz 61434745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 61534745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 61634745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 61734745785SMilan Broz 61834745785SMilan Broz return 0; 61934745785SMilan Broz } 62034745785SMilan Broz 62134745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 62234745785SMilan Broz struct dm_crypt_request *dmreq) 62334745785SMilan Broz { 624ef43aa38SMilan Broz struct scatterlist *sg; 62534745785SMilan Broz u8 *src; 62634745785SMilan Broz int r = 0; 62734745785SMilan Broz 62834745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 629ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 630ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 631ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 632c2e022cbSCong Wang kunmap_atomic(src); 63334745785SMilan Broz } else 63434745785SMilan Broz memset(iv, 0, cc->iv_size); 63534745785SMilan Broz 63634745785SMilan Broz return r; 63734745785SMilan Broz } 63834745785SMilan Broz 63934745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 64034745785SMilan Broz struct dm_crypt_request *dmreq) 64134745785SMilan Broz { 642ef43aa38SMilan Broz struct scatterlist *sg; 64334745785SMilan Broz u8 *dst; 64434745785SMilan Broz int r; 64534745785SMilan Broz 64634745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 64734745785SMilan Broz return 0; 64834745785SMilan Broz 649ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 650ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 651ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 65234745785SMilan Broz 65334745785SMilan Broz /* Tweak the first block of plaintext sector */ 65434745785SMilan Broz if (!r) 655ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 65634745785SMilan Broz 657c2e022cbSCong Wang kunmap_atomic(dst); 65834745785SMilan Broz return r; 65934745785SMilan Broz } 66034745785SMilan Broz 661ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 662ed04d981SMilan Broz { 663ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 664ed04d981SMilan Broz 665ed04d981SMilan Broz kzfree(tcw->iv_seed); 666ed04d981SMilan Broz tcw->iv_seed = NULL; 667ed04d981SMilan Broz kzfree(tcw->whitening); 668ed04d981SMilan Broz tcw->whitening = NULL; 669ed04d981SMilan Broz 670ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 671ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 672ed04d981SMilan Broz tcw->crc32_tfm = NULL; 673ed04d981SMilan Broz } 674ed04d981SMilan Broz 675ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 676ed04d981SMilan Broz const char *opts) 677ed04d981SMilan Broz { 678ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 679ed04d981SMilan Broz 680ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 681ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 682ed04d981SMilan Broz return -EINVAL; 683ed04d981SMilan Broz } 684ed04d981SMilan Broz 685ed04d981SMilan Broz tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); 686ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 687ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 688ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 689ed04d981SMilan Broz } 690ed04d981SMilan Broz 691ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 692ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 693ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 694ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 695ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 696ed04d981SMilan Broz return -ENOMEM; 697ed04d981SMilan Broz } 698ed04d981SMilan Broz 699ed04d981SMilan Broz return 0; 700ed04d981SMilan Broz } 701ed04d981SMilan Broz 702ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 703ed04d981SMilan Broz { 704ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 705ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 706ed04d981SMilan Broz 707ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 708ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 709ed04d981SMilan Broz TCW_WHITENING_SIZE); 710ed04d981SMilan Broz 711ed04d981SMilan Broz return 0; 712ed04d981SMilan Broz } 713ed04d981SMilan Broz 714ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 715ed04d981SMilan Broz { 716ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 717ed04d981SMilan Broz 718ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 719ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 720ed04d981SMilan Broz 721ed04d981SMilan Broz return 0; 722ed04d981SMilan Broz } 723ed04d981SMilan Broz 724ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 725ed04d981SMilan Broz struct dm_crypt_request *dmreq, 726ed04d981SMilan Broz u8 *data) 727ed04d981SMilan Broz { 728ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 729350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 730ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 731b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 732ed04d981SMilan Broz int i, r; 733ed04d981SMilan Broz 734ed04d981SMilan Broz /* xor whitening with sector number */ 735ed04d981SMilan Broz memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); 736ed04d981SMilan Broz crypto_xor(buf, (u8 *)§or, 8); 737ed04d981SMilan Broz crypto_xor(&buf[8], (u8 *)§or, 8); 738ed04d981SMilan Broz 739ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 740b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 741b6106265SJan-Simon Möller desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 742ed04d981SMilan Broz for (i = 0; i < 4; i++) { 743b6106265SJan-Simon Möller r = crypto_shash_init(desc); 744ed04d981SMilan Broz if (r) 745ed04d981SMilan Broz goto out; 746b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 747ed04d981SMilan Broz if (r) 748ed04d981SMilan Broz goto out; 749b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 750ed04d981SMilan Broz if (r) 751ed04d981SMilan Broz goto out; 752ed04d981SMilan Broz } 753ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 754ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 755ed04d981SMilan Broz 756ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 757ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 758ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 759ed04d981SMilan Broz out: 7601a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 761ed04d981SMilan Broz return r; 762ed04d981SMilan Broz } 763ed04d981SMilan Broz 764ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 765ed04d981SMilan Broz struct dm_crypt_request *dmreq) 766ed04d981SMilan Broz { 767ef43aa38SMilan Broz struct scatterlist *sg; 768ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 769350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 770ed04d981SMilan Broz u8 *src; 771ed04d981SMilan Broz int r = 0; 772ed04d981SMilan Broz 773ed04d981SMilan Broz /* Remove whitening from ciphertext */ 774ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 775ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 776ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 777ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 778ed04d981SMilan Broz kunmap_atomic(src); 779ed04d981SMilan Broz } 780ed04d981SMilan Broz 781ed04d981SMilan Broz /* Calculate IV */ 782ed04d981SMilan Broz memcpy(iv, tcw->iv_seed, cc->iv_size); 783ed04d981SMilan Broz crypto_xor(iv, (u8 *)§or, 8); 784ed04d981SMilan Broz if (cc->iv_size > 8) 785ed04d981SMilan Broz crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); 786ed04d981SMilan Broz 787ed04d981SMilan Broz return r; 788ed04d981SMilan Broz } 789ed04d981SMilan Broz 790ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 791ed04d981SMilan Broz struct dm_crypt_request *dmreq) 792ed04d981SMilan Broz { 793ef43aa38SMilan Broz struct scatterlist *sg; 794ed04d981SMilan Broz u8 *dst; 795ed04d981SMilan Broz int r; 796ed04d981SMilan Broz 797ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 798ed04d981SMilan Broz return 0; 799ed04d981SMilan Broz 800ed04d981SMilan Broz /* Apply whitening on ciphertext */ 801ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 802ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 803ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 804ed04d981SMilan Broz kunmap_atomic(dst); 805ed04d981SMilan Broz 806ed04d981SMilan Broz return r; 807ed04d981SMilan Broz } 808ed04d981SMilan Broz 809ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 810ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 811ef43aa38SMilan Broz { 812ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 813ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 814ef43aa38SMilan Broz return 0; 815ef43aa38SMilan Broz } 816ef43aa38SMilan Broz 8171b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 8181da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 8191da177e4SLinus Torvalds }; 8201da177e4SLinus Torvalds 8211b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 82261afef61SMilan Broz .generator = crypt_iv_plain64_gen 82361afef61SMilan Broz }; 82461afef61SMilan Broz 8251b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 8261da177e4SLinus Torvalds .ctr = crypt_iv_essiv_ctr, 8271da177e4SLinus Torvalds .dtr = crypt_iv_essiv_dtr, 828b95bf2d3SMilan Broz .init = crypt_iv_essiv_init, 829542da317SMilan Broz .wipe = crypt_iv_essiv_wipe, 8301da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 8311da177e4SLinus Torvalds }; 8321da177e4SLinus Torvalds 8331b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 83448527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 83548527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 83648527fa7SRik Snel .generator = crypt_iv_benbi_gen 83748527fa7SRik Snel }; 8381da177e4SLinus Torvalds 8391b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 84046b47730SLudwig Nussel .generator = crypt_iv_null_gen 84146b47730SLudwig Nussel }; 84246b47730SLudwig Nussel 8431b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 84434745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 84534745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 84634745785SMilan Broz .init = crypt_iv_lmk_init, 84734745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 84834745785SMilan Broz .generator = crypt_iv_lmk_gen, 84934745785SMilan Broz .post = crypt_iv_lmk_post 85034745785SMilan Broz }; 85134745785SMilan Broz 8521b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 853ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 854ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 855ed04d981SMilan Broz .init = crypt_iv_tcw_init, 856ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 857ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 858ed04d981SMilan Broz .post = crypt_iv_tcw_post 859ed04d981SMilan Broz }; 860ed04d981SMilan Broz 861ef43aa38SMilan Broz static struct crypt_iv_operations crypt_iv_random_ops = { 862ef43aa38SMilan Broz .generator = crypt_iv_random_gen 863ef43aa38SMilan Broz }; 864ef43aa38SMilan Broz 865ef43aa38SMilan Broz /* 866ef43aa38SMilan Broz * Integrity extensions 867ef43aa38SMilan Broz */ 868ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 869ef43aa38SMilan Broz { 870ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 871ef43aa38SMilan Broz } 872ef43aa38SMilan Broz 873ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 874ef43aa38SMilan Broz { 87533d2f09fSMilan Broz return crypt_integrity_aead(cc) && cc->key_mac_size; 876ef43aa38SMilan Broz } 877ef43aa38SMilan Broz 878ef43aa38SMilan Broz /* Get sg containing data */ 879ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 880ef43aa38SMilan Broz struct scatterlist *sg) 881ef43aa38SMilan Broz { 88233d2f09fSMilan Broz if (unlikely(crypt_integrity_aead(cc))) 883ef43aa38SMilan Broz return &sg[2]; 884ef43aa38SMilan Broz 885ef43aa38SMilan Broz return sg; 886ef43aa38SMilan Broz } 887ef43aa38SMilan Broz 888ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 889ef43aa38SMilan Broz { 890ef43aa38SMilan Broz struct bio_integrity_payload *bip; 891ef43aa38SMilan Broz unsigned int tag_len; 892ef43aa38SMilan Broz int ret; 893ef43aa38SMilan Broz 894ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 895ef43aa38SMilan Broz return 0; 896ef43aa38SMilan Broz 897ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 898ef43aa38SMilan Broz if (IS_ERR(bip)) 899ef43aa38SMilan Broz return PTR_ERR(bip); 900ef43aa38SMilan Broz 901ef43aa38SMilan Broz tag_len = io->cc->on_disk_tag_size * bio_sectors(bio); 902ef43aa38SMilan Broz 903ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 904ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 905ef43aa38SMilan Broz 906ef43aa38SMilan Broz /* We own the metadata, do not let bio_free to release it */ 907ef43aa38SMilan Broz bip->bip_flags &= ~BIP_BLOCK_INTEGRITY; 908ef43aa38SMilan Broz 909ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 910ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 911ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 912ef43aa38SMilan Broz return -ENOMEM; 913ef43aa38SMilan Broz 914ef43aa38SMilan Broz return 0; 915ef43aa38SMilan Broz } 916ef43aa38SMilan Broz 917ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 918ef43aa38SMilan Broz { 919ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 920ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 921ef43aa38SMilan Broz 922ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 923ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 924ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 925ef43aa38SMilan Broz return -EINVAL; 926ef43aa38SMilan Broz } 927ef43aa38SMilan Broz 928ef43aa38SMilan Broz if (bi->tag_size != cc->on_disk_tag_size) { 929ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 930ef43aa38SMilan Broz return -EINVAL; 931ef43aa38SMilan Broz } 932ef43aa38SMilan Broz 93333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 934ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 935ef43aa38SMilan Broz DMINFO("Integrity AEAD, tag size %u, IV size %u.", 936ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 937ef43aa38SMilan Broz 938ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 939ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 940ef43aa38SMilan Broz return -EINVAL; 941ef43aa38SMilan Broz } 942ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 943ef43aa38SMilan Broz DMINFO("Additional per-sector space %u bytes for IV.", 944ef43aa38SMilan Broz cc->integrity_iv_size); 945ef43aa38SMilan Broz 946ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 947ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 948ef43aa38SMilan Broz return -EINVAL; 949ef43aa38SMilan Broz } 950ef43aa38SMilan Broz 951ef43aa38SMilan Broz return 0; 952ef43aa38SMilan Broz #else 953ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 954ef43aa38SMilan Broz return -EINVAL; 955ef43aa38SMilan Broz #endif 956ef43aa38SMilan Broz } 957ef43aa38SMilan Broz 958d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 959d469f841SMilan Broz struct convert_context *ctx, 9601da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 961fcd369daSMilan Broz sector_t sector) 9621da177e4SLinus Torvalds { 9631da177e4SLinus Torvalds ctx->bio_in = bio_in; 9641da177e4SLinus Torvalds ctx->bio_out = bio_out; 965003b5c57SKent Overstreet if (bio_in) 966003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 967003b5c57SKent Overstreet if (bio_out) 968003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 969c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 97043d69034SMilan Broz init_completion(&ctx->restart); 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 973b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 974ef43aa38SMilan Broz void *req) 975b2174eebSHuang Ying { 976b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 977b2174eebSHuang Ying } 978b2174eebSHuang Ying 979ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 980b2174eebSHuang Ying { 981ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 982b2174eebSHuang Ying } 983b2174eebSHuang Ying 9842dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 9852dc5327dSMilan Broz struct dm_crypt_request *dmreq) 9862dc5327dSMilan Broz { 98733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 988ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 989ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 990ef43aa38SMilan Broz else 9912dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 992bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 9932dc5327dSMilan Broz } 9942dc5327dSMilan Broz 995ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 996ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 997ef43aa38SMilan Broz { 998ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 999ef43aa38SMilan Broz } 1000ef43aa38SMilan Broz 1001ef43aa38SMilan Broz static uint64_t *org_sector_of_dmreq(struct crypt_config *cc, 1002ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1003ef43aa38SMilan Broz { 1004ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1005ef43aa38SMilan Broz return (uint64_t*) ptr; 1006ef43aa38SMilan Broz } 1007ef43aa38SMilan Broz 1008ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1009ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1010ef43aa38SMilan Broz { 1011ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1012ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1013ef43aa38SMilan Broz return (unsigned int*)ptr; 1014ef43aa38SMilan Broz } 1015ef43aa38SMilan Broz 1016ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1017ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1018ef43aa38SMilan Broz { 1019ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1020ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1021ef43aa38SMilan Broz 1022ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1023ef43aa38SMilan Broz cc->on_disk_tag_size]; 1024ef43aa38SMilan Broz } 1025ef43aa38SMilan Broz 1026ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1027ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1028ef43aa38SMilan Broz { 1029ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1030ef43aa38SMilan Broz } 1031ef43aa38SMilan Broz 1032ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 10333a7f6c99SMilan Broz struct convert_context *ctx, 1034ef43aa38SMilan Broz struct aead_request *req, 1035ef43aa38SMilan Broz unsigned int tag_offset) 103601482b76SMilan Broz { 1037003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1038003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 10393a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1040ef43aa38SMilan Broz unsigned int data_len = 1 << SECTOR_SHIFT; 1041ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1042ef43aa38SMilan Broz uint64_t *sector; 1043ef43aa38SMilan Broz int r = 0; 1044ef43aa38SMilan Broz 1045ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 104601482b76SMilan Broz 1047b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1048c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 1049b2174eebSHuang Ying dmreq->ctx = ctx; 105001482b76SMilan Broz 1051ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 105201482b76SMilan Broz 1053ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1054ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1055ef43aa38SMilan Broz 1056ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1057ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1058ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1059ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1060ef43aa38SMilan Broz 1061ef43aa38SMilan Broz /* AEAD request: 1062ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1063ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1064ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1065ef43aa38SMilan Broz */ 1066ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1067ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1068ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 1069ef43aa38SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, data_len, bv_in.bv_offset); 1070ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1071ef43aa38SMilan Broz 1072ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1073ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1074ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 1075ef43aa38SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, data_len, bv_out.bv_offset); 1076ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 107701482b76SMilan Broz 10783a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1079ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1080ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1081ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1082ef43aa38SMilan Broz } else { 1083ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 10843a7f6c99SMilan Broz if (r < 0) 10853a7f6c99SMilan Broz return r; 1086ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1087ef43aa38SMilan Broz if (cc->integrity_iv_size) 1088ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1089ef43aa38SMilan Broz } 1090ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1091ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1092ef43aa38SMilan Broz } 1093ef43aa38SMilan Broz 1094ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1095ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1096ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1097ef43aa38SMilan Broz data_len, iv); 1098ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1099ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1100ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1101ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1102ef43aa38SMilan Broz } else { 1103ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 1104ef43aa38SMilan Broz data_len + cc->integrity_tag_size, iv); 1105ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1106ef43aa38SMilan Broz } 1107ef43aa38SMilan Broz 1108ef43aa38SMilan Broz if (r == -EBADMSG) 1109ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1110ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*sector)); 1111ef43aa38SMilan Broz 1112ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1113ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1114ef43aa38SMilan Broz 1115ef43aa38SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); 1116ef43aa38SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); 1117ef43aa38SMilan Broz 1118ef43aa38SMilan Broz return r; 11193a7f6c99SMilan Broz } 11203a7f6c99SMilan Broz 1121ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1122ef43aa38SMilan Broz struct convert_context *ctx, 1123ef43aa38SMilan Broz struct skcipher_request *req, 1124ef43aa38SMilan Broz unsigned int tag_offset) 1125ef43aa38SMilan Broz { 1126ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1127ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1128ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1129ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1130ef43aa38SMilan Broz unsigned int data_len = 1 << SECTOR_SHIFT; 1131ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1132ef43aa38SMilan Broz uint64_t *sector; 1133ef43aa38SMilan Broz int r = 0; 1134ef43aa38SMilan Broz 1135ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1136ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 1137ef43aa38SMilan Broz dmreq->ctx = ctx; 1138ef43aa38SMilan Broz 1139ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1140ef43aa38SMilan Broz 1141ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1142ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1143ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1144ef43aa38SMilan Broz 1145ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1146ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1147ef43aa38SMilan Broz 1148ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1149ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1150ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1151ef43aa38SMilan Broz 1152ef43aa38SMilan Broz sg_init_table(sg_in, 1); 1153ef43aa38SMilan Broz sg_set_page(sg_in, bv_in.bv_page, data_len, bv_in.bv_offset); 1154ef43aa38SMilan Broz 1155ef43aa38SMilan Broz sg_init_table(sg_out, 1); 1156ef43aa38SMilan Broz sg_set_page(sg_out, bv_out.bv_page, data_len, bv_out.bv_offset); 1157ef43aa38SMilan Broz 1158ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1159ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1160ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1161ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1162ef43aa38SMilan Broz } else { 1163ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1164ef43aa38SMilan Broz if (r < 0) 1165ef43aa38SMilan Broz return r; 1166ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1167ef43aa38SMilan Broz if (cc->integrity_iv_size) 1168ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1169ef43aa38SMilan Broz } 1170ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1171ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1172ef43aa38SMilan Broz } 1173ef43aa38SMilan Broz 1174ef43aa38SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, data_len, iv); 11753a7f6c99SMilan Broz 11763a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1177bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 11783a7f6c99SMilan Broz else 1179bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 11803a7f6c99SMilan Broz 11812dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1182ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1183ef43aa38SMilan Broz 1184ef43aa38SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); 1185ef43aa38SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); 11862dc5327dSMilan Broz 11873a7f6c99SMilan Broz return r; 118801482b76SMilan Broz } 118901482b76SMilan Broz 119095497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 119195497a96SMilan Broz int error); 1192c0297721SAndi Kleen 1193ef43aa38SMilan Broz static void crypt_alloc_req_skcipher(struct crypt_config *cc, 1194ddd42edfSMilan Broz struct convert_context *ctx) 1195ddd42edfSMilan Broz { 1196c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1197c0297721SAndi Kleen 1198ef43aa38SMilan Broz if (!ctx->r.req) 1199ef43aa38SMilan Broz ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO); 1200c0297721SAndi Kleen 1201ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 120254cea3f6SMilan Broz 120354cea3f6SMilan Broz /* 120454cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 120554cea3f6SMilan Broz * requests if driver request queue is full. 120654cea3f6SMilan Broz */ 1207ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1208c0297721SAndi Kleen CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1209ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1210ddd42edfSMilan Broz } 1211ddd42edfSMilan Broz 1212ef43aa38SMilan Broz static void crypt_alloc_req_aead(struct crypt_config *cc, 1213ef43aa38SMilan Broz struct convert_context *ctx) 1214ef43aa38SMilan Broz { 1215ef43aa38SMilan Broz if (!ctx->r.req_aead) 1216ef43aa38SMilan Broz ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO); 1217ef43aa38SMilan Broz 1218ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1219ef43aa38SMilan Broz 1220ef43aa38SMilan Broz /* 1221ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1222ef43aa38SMilan Broz * requests if driver request queue is full. 1223ef43aa38SMilan Broz */ 1224ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1225ef43aa38SMilan Broz CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, 1226ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1227ef43aa38SMilan Broz } 1228ef43aa38SMilan Broz 1229ef43aa38SMilan Broz static void crypt_alloc_req(struct crypt_config *cc, 1230ef43aa38SMilan Broz struct convert_context *ctx) 1231ef43aa38SMilan Broz { 123233d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1233ef43aa38SMilan Broz crypt_alloc_req_aead(cc, ctx); 1234ef43aa38SMilan Broz else 1235ef43aa38SMilan Broz crypt_alloc_req_skcipher(cc, ctx); 1236ef43aa38SMilan Broz } 1237ef43aa38SMilan Broz 1238ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1239bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1240298a9fa0SMikulas Patocka { 1241298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1242298a9fa0SMikulas Patocka 1243bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 1244298a9fa0SMikulas Patocka mempool_free(req, cc->req_pool); 1245298a9fa0SMikulas Patocka } 1246298a9fa0SMikulas Patocka 1247ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1248ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1249ef43aa38SMilan Broz { 1250ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1251ef43aa38SMilan Broz 1252ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 1253ef43aa38SMilan Broz mempool_free(req, cc->req_pool); 1254ef43aa38SMilan Broz } 1255ef43aa38SMilan Broz 1256ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1257ef43aa38SMilan Broz { 125833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1259ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1260ef43aa38SMilan Broz else 1261ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1262ef43aa38SMilan Broz } 1263ef43aa38SMilan Broz 12641da177e4SLinus Torvalds /* 12651da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 12661da177e4SLinus Torvalds */ 12671da177e4SLinus Torvalds static int crypt_convert(struct crypt_config *cc, 12681da177e4SLinus Torvalds struct convert_context *ctx) 12691da177e4SLinus Torvalds { 1270ef43aa38SMilan Broz unsigned int tag_offset = 0; 12713f1e9070SMilan Broz int r; 12721da177e4SLinus Torvalds 127340b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1274c8081618SMilan Broz 1275003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 12761da177e4SLinus Torvalds 12773a7f6c99SMilan Broz crypt_alloc_req(cc, ctx); 12783a7f6c99SMilan Broz 127940b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 12803f1e9070SMilan Broz 128133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1282ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1283ef43aa38SMilan Broz else 1284ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 12853a7f6c99SMilan Broz 12863a7f6c99SMilan Broz switch (r) { 128754cea3f6SMilan Broz /* 128854cea3f6SMilan Broz * The request was queued by a crypto driver 128954cea3f6SMilan Broz * but the driver request queue is full, let's wait. 129054cea3f6SMilan Broz */ 12913a7f6c99SMilan Broz case -EBUSY: 12923a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 129316735d02SWolfram Sang reinit_completion(&ctx->restart); 1294c0403ec0SRabin Vincent /* fall through */ 129554cea3f6SMilan Broz /* 129654cea3f6SMilan Broz * The request is queued and processed asynchronously, 129754cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 129854cea3f6SMilan Broz */ 1299c0403ec0SRabin Vincent case -EINPROGRESS: 1300ef43aa38SMilan Broz ctx->r.req = NULL; 1301c66029f4SMikulas Patocka ctx->cc_sector++; 1302ef43aa38SMilan Broz tag_offset++; 13033a7f6c99SMilan Broz continue; 130454cea3f6SMilan Broz /* 130554cea3f6SMilan Broz * The request was already processed (synchronously). 130654cea3f6SMilan Broz */ 13073f1e9070SMilan Broz case 0: 130840b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 1309c66029f4SMikulas Patocka ctx->cc_sector++; 1310ef43aa38SMilan Broz tag_offset++; 1311c7f1b204SMilan Broz cond_resched(); 13123f1e9070SMilan Broz continue; 1313ef43aa38SMilan Broz /* 1314ef43aa38SMilan Broz * There was a data integrity error. 1315ef43aa38SMilan Broz */ 1316ef43aa38SMilan Broz case -EBADMSG: 1317ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 1318ef43aa38SMilan Broz return -EILSEQ; 1319ef43aa38SMilan Broz /* 1320ef43aa38SMilan Broz * There was an error while processing the request. 1321ef43aa38SMilan Broz */ 13223f1e9070SMilan Broz default: 132340b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 1324ef43aa38SMilan Broz return -EIO; 13251da177e4SLinus Torvalds } 13263f1e9070SMilan Broz } 13273f1e9070SMilan Broz 13283f1e9070SMilan Broz return 0; 13293f1e9070SMilan Broz } 13301da177e4SLinus Torvalds 1331cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1332cf2f1abfSMikulas Patocka 13331da177e4SLinus Torvalds /* 13341da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1335586b286bSMike Snitzer * This should never violate the device limitations (but only because 1336586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 13377145c241SMikulas Patocka * 13387145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 13397145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 13407145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 13417145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 13427145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 13437145c241SMikulas Patocka * 13447145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 13457145c241SMikulas Patocka * 13467145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 13477145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 13487145c241SMikulas Patocka * to blocking allocations with a mutex. 13491da177e4SLinus Torvalds */ 1350cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 13511da177e4SLinus Torvalds { 135249a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 13538b004457SMilan Broz struct bio *clone; 13541da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 13557145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 13567145c241SMikulas Patocka unsigned i, len, remaining_size; 135791e10625SMilan Broz struct page *page; 13581da177e4SLinus Torvalds 13597145c241SMikulas Patocka retry: 1360d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 13617145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 13627145c241SMikulas Patocka 13636a24c718SMilan Broz clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); 13648b004457SMilan Broz if (!clone) 1365ef43aa38SMilan Broz goto out; 13661da177e4SLinus Torvalds 1367027581f3SOlaf Kirch clone_init(io, clone); 13686a24c718SMilan Broz 13697145c241SMikulas Patocka remaining_size = size; 13707145c241SMikulas Patocka 1371f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 137291e10625SMilan Broz page = mempool_alloc(cc->page_pool, gfp_mask); 13737145c241SMikulas Patocka if (!page) { 13747145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 13757145c241SMikulas Patocka bio_put(clone); 1376d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 13777145c241SMikulas Patocka goto retry; 13787145c241SMikulas Patocka } 13791da177e4SLinus Torvalds 13807145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 13811da177e4SLinus Torvalds 13820dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 138391e10625SMilan Broz 13847145c241SMikulas Patocka remaining_size -= len; 13851da177e4SLinus Torvalds } 13861da177e4SLinus Torvalds 1387ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1388ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1389ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1390ef43aa38SMilan Broz bio_put(clone); 1391ef43aa38SMilan Broz clone = NULL; 1392ef43aa38SMilan Broz } 1393ef43aa38SMilan Broz out: 1394d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 13957145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 13967145c241SMikulas Patocka 13978b004457SMilan Broz return clone; 13981da177e4SLinus Torvalds } 13991da177e4SLinus Torvalds 1400644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 14011da177e4SLinus Torvalds { 1402644bd2f0SNeil Brown unsigned int i; 14031da177e4SLinus Torvalds struct bio_vec *bv; 14041da177e4SLinus Torvalds 1405cb34e057SKent Overstreet bio_for_each_segment_all(bv, clone, i) { 14061da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 14071da177e4SLinus Torvalds mempool_free(bv->bv_page, cc->page_pool); 14081da177e4SLinus Torvalds bv->bv_page = NULL; 14091da177e4SLinus Torvalds } 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 1412298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1413dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1414dc440d1eSMilan Broz { 141549a8a920SAlasdair G Kergon io->cc = cc; 1416dc440d1eSMilan Broz io->base_bio = bio; 1417dc440d1eSMilan Broz io->sector = sector; 1418dc440d1eSMilan Broz io->error = 0; 1419ef43aa38SMilan Broz io->ctx.r.req = NULL; 1420ef43aa38SMilan Broz io->integrity_metadata = NULL; 1421ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 142240b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1423dc440d1eSMilan Broz } 1424dc440d1eSMilan Broz 14253e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 14263e1a8bddSMilan Broz { 142740b6229bSMikulas Patocka atomic_inc(&io->io_pending); 14283e1a8bddSMilan Broz } 14293e1a8bddSMilan Broz 14301da177e4SLinus Torvalds /* 14311da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 14321da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 14331da177e4SLinus Torvalds */ 14345742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 14351da177e4SLinus Torvalds { 143649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1437b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 1438b35f8caaSMilan Broz int error = io->error; 14391da177e4SLinus Torvalds 144040b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 14411da177e4SLinus Torvalds return; 14421da177e4SLinus Torvalds 1443ef43aa38SMilan Broz if (io->ctx.r.req) 1444ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1445ef43aa38SMilan Broz 1446ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 1447ef43aa38SMilan Broz mempool_free(io->integrity_metadata, io->cc->tag_pool); 1448ef43aa38SMilan Broz else 1449ef43aa38SMilan Broz kfree(io->integrity_metadata); 1450b35f8caaSMilan Broz 14514246a0b6SChristoph Hellwig base_bio->bi_error = error; 14524246a0b6SChristoph Hellwig bio_endio(base_bio); 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds /* 1456cabf08e4SMilan Broz * kcryptd/kcryptd_io: 14571da177e4SLinus Torvalds * 14581da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 145923541d2dSMilan Broz * interrupt context. 1460cabf08e4SMilan Broz * 1461cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1462cabf08e4SMilan Broz * 1463cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1464cabf08e4SMilan Broz * 1465cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1466cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1467cabf08e4SMilan Broz * to memory allocation. 1468c0297721SAndi Kleen * 1469c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1470c0297721SAndi Kleen * They should not depend on each other and do not block. 14711da177e4SLinus Torvalds */ 14724246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 14738b004457SMilan Broz { 1474028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 147549a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1476ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 14779b81c842SSasha Levin int error; 14788b004457SMilan Broz 14798b004457SMilan Broz /* 14806712ecf8SNeilBrown * free the processed pages 14818b004457SMilan Broz */ 1482ee7a491eSMilan Broz if (rw == WRITE) 1483644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 14848b004457SMilan Broz 14859b81c842SSasha Levin error = clone->bi_error; 14868b004457SMilan Broz bio_put(clone); 1487ee7a491eSMilan Broz 14889b81c842SSasha Levin if (rw == READ && !error) { 1489cabf08e4SMilan Broz kcryptd_queue_crypt(io); 14906712ecf8SNeilBrown return; 1491ee7a491eSMilan Broz } 14925742fd77SMilan Broz 14939b81c842SSasha Levin if (unlikely(error)) 14949b81c842SSasha Levin io->error = error; 14955742fd77SMilan Broz 14965742fd77SMilan Broz crypt_dec_pending(io); 14978b004457SMilan Broz } 14988b004457SMilan Broz 1499028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 15008b004457SMilan Broz { 150149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15028b004457SMilan Broz 15038b004457SMilan Broz clone->bi_private = io; 15048b004457SMilan Broz clone->bi_end_io = crypt_endio; 15058b004457SMilan Broz clone->bi_bdev = cc->dev->bdev; 1506ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 15078b004457SMilan Broz } 15088b004457SMilan Broz 150920c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 15108b004457SMilan Broz { 151149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 15128b004457SMilan Broz struct bio *clone; 151393e605c2SMilan Broz 15148b004457SMilan Broz /* 151559779079SMike Snitzer * We need the original biovec array in order to decrypt 151659779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 151759779079SMike Snitzer * biovecs we don't need to worry about the block layer 151859779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 15198b004457SMilan Broz */ 152059779079SMike Snitzer clone = bio_clone_fast(io->base_bio, gfp, cc->bs); 15217eaceaccSJens Axboe if (!clone) 152220c82538SMilan Broz return 1; 15238b004457SMilan Broz 152420c82538SMilan Broz crypt_inc_pending(io); 152520c82538SMilan Broz 15268b004457SMilan Broz clone_init(io, clone); 15274f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 15288b004457SMilan Broz 1529ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1530ef43aa38SMilan Broz crypt_dec_pending(io); 1531ef43aa38SMilan Broz bio_put(clone); 1532ef43aa38SMilan Broz return 1; 1533ef43aa38SMilan Broz } 1534ef43aa38SMilan Broz 153593e605c2SMilan Broz generic_make_request(clone); 153620c82538SMilan Broz return 0; 15378b004457SMilan Broz } 15388b004457SMilan Broz 1539dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1540395b167cSAlasdair G Kergon { 1541395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1542395b167cSAlasdair G Kergon 154320c82538SMilan Broz crypt_inc_pending(io); 154420c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 154520c82538SMilan Broz io->error = -ENOMEM; 154620c82538SMilan Broz crypt_dec_pending(io); 1547395b167cSAlasdair G Kergon } 1548395b167cSAlasdair G Kergon 1549dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1550395b167cSAlasdair G Kergon { 155149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1552395b167cSAlasdair G Kergon 1553dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1554395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1555395b167cSAlasdair G Kergon } 1556395b167cSAlasdair G Kergon 1557dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1558dc267621SMikulas Patocka { 1559dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1560dc267621SMikulas Patocka 1561dc267621SMikulas Patocka generic_make_request(clone); 1562dc267621SMikulas Patocka } 1563dc267621SMikulas Patocka 1564b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1565b3c5fd30SMikulas Patocka 1566dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1567dc267621SMikulas Patocka { 1568dc267621SMikulas Patocka struct crypt_config *cc = data; 1569b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1570b3c5fd30SMikulas Patocka 1571dc267621SMikulas Patocka while (1) { 1572b3c5fd30SMikulas Patocka struct rb_root write_tree; 1573dc267621SMikulas Patocka struct blk_plug plug; 1574dc267621SMikulas Patocka 1575dc267621SMikulas Patocka DECLARE_WAITQUEUE(wait, current); 1576dc267621SMikulas Patocka 1577dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1578dc267621SMikulas Patocka continue_locked: 1579dc267621SMikulas Patocka 1580b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1581dc267621SMikulas Patocka goto pop_from_list; 1582dc267621SMikulas Patocka 1583f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1584dc267621SMikulas Patocka __add_wait_queue(&cc->write_thread_wait, &wait); 1585dc267621SMikulas Patocka 1586dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1587dc267621SMikulas Patocka 1588f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1589642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1590f659b100SRabin Vincent remove_wait_queue(&cc->write_thread_wait, &wait); 1591f659b100SRabin Vincent break; 1592f659b100SRabin Vincent } 1593f659b100SRabin Vincent 1594dc267621SMikulas Patocka schedule(); 1595dc267621SMikulas Patocka 1596642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1597dc267621SMikulas Patocka spin_lock_irq(&cc->write_thread_wait.lock); 1598dc267621SMikulas Patocka __remove_wait_queue(&cc->write_thread_wait, &wait); 1599dc267621SMikulas Patocka goto continue_locked; 1600dc267621SMikulas Patocka 1601dc267621SMikulas Patocka pop_from_list: 1602b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1603b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1604dc267621SMikulas Patocka spin_unlock_irq(&cc->write_thread_wait.lock); 1605dc267621SMikulas Patocka 1606b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1607b3c5fd30SMikulas Patocka 1608b3c5fd30SMikulas Patocka /* 1609b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1610b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1611b3c5fd30SMikulas Patocka */ 1612dc267621SMikulas Patocka blk_start_plug(&plug); 1613dc267621SMikulas Patocka do { 1614b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1615b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1616dc267621SMikulas Patocka kcryptd_io_write(io); 1617b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1618dc267621SMikulas Patocka blk_finish_plug(&plug); 1619dc267621SMikulas Patocka } 1620dc267621SMikulas Patocka return 0; 1621dc267621SMikulas Patocka } 1622dc267621SMikulas Patocka 162372c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 16244e4eef64SMilan Broz { 1625dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 162649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1627dc267621SMikulas Patocka unsigned long flags; 1628b3c5fd30SMikulas Patocka sector_t sector; 1629b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1630dec1cedfSMilan Broz 163172c6e7afSMikulas Patocka if (unlikely(io->error < 0)) { 1632dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1633dec1cedfSMilan Broz bio_put(clone); 16346c031f41SMilan Broz crypt_dec_pending(io); 1635dec1cedfSMilan Broz return; 1636dec1cedfSMilan Broz } 1637dec1cedfSMilan Broz 1638dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1639003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1640dec1cedfSMilan Broz 16414f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1642899c95d3SMilan Broz 16430f5d8e6eSMikulas Patocka if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { 16440f5d8e6eSMikulas Patocka generic_make_request(clone); 16450f5d8e6eSMikulas Patocka return; 16460f5d8e6eSMikulas Patocka } 16470f5d8e6eSMikulas Patocka 1648dc267621SMikulas Patocka spin_lock_irqsave(&cc->write_thread_wait.lock, flags); 1649b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1650b3c5fd30SMikulas Patocka parent = NULL; 1651b3c5fd30SMikulas Patocka sector = io->sector; 1652b3c5fd30SMikulas Patocka while (*rbp) { 1653b3c5fd30SMikulas Patocka parent = *rbp; 1654b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1655b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1656b3c5fd30SMikulas Patocka else 1657b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1658b3c5fd30SMikulas Patocka } 1659b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1660b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1661b3c5fd30SMikulas Patocka 1662dc267621SMikulas Patocka wake_up_locked(&cc->write_thread_wait); 1663dc267621SMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_wait.lock, flags); 16644e4eef64SMilan Broz } 16654e4eef64SMilan Broz 1666fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 16678b004457SMilan Broz { 166849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16698b004457SMilan Broz struct bio *clone; 1670c8081618SMilan Broz int crypt_finished; 1671b635b00eSMilan Broz sector_t sector = io->sector; 1672dec1cedfSMilan Broz int r; 16738b004457SMilan Broz 167493e605c2SMilan Broz /* 1675fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 1676fc5a5e9aSMilan Broz */ 1677fc5a5e9aSMilan Broz crypt_inc_pending(io); 1678b635b00eSMilan Broz crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); 1679fc5a5e9aSMilan Broz 1680cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 168123541d2dSMilan Broz if (unlikely(!clone)) { 1682cf2f1abfSMikulas Patocka io->error = -EIO; 1683cf2f1abfSMikulas Patocka goto dec; 168423541d2dSMilan Broz } 16858b004457SMilan Broz 168653017030SMilan Broz io->ctx.bio_out = clone; 1687003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 16888b004457SMilan Broz 1689b635b00eSMilan Broz sector += bio_sectors(clone); 1690dec1cedfSMilan Broz 16914e594098SMilan Broz crypt_inc_pending(io); 1692dec1cedfSMilan Broz r = crypt_convert(cc, &io->ctx); 1693ef43aa38SMilan Broz if (r < 0) 1694ef43aa38SMilan Broz io->error = r; 169540b6229bSMikulas Patocka crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); 1696dec1cedfSMilan Broz 1697c8081618SMilan Broz /* Encryption was already finished, submit io now */ 1698c8081618SMilan Broz if (crypt_finished) { 169972c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 1700b635b00eSMilan Broz io->sector = sector; 17014e594098SMilan Broz } 170293e605c2SMilan Broz 1703cf2f1abfSMikulas Patocka dec: 1704899c95d3SMilan Broz crypt_dec_pending(io); 170584131db6SMilan Broz } 170684131db6SMilan Broz 170772c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 17085742fd77SMilan Broz { 17095742fd77SMilan Broz crypt_dec_pending(io); 17105742fd77SMilan Broz } 17115742fd77SMilan Broz 17124e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 17138b004457SMilan Broz { 171449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 17155742fd77SMilan Broz int r = 0; 17168b004457SMilan Broz 17173e1a8bddSMilan Broz crypt_inc_pending(io); 17183a7f6c99SMilan Broz 171953017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 17200c395b0fSMilan Broz io->sector); 17218b004457SMilan Broz 17225742fd77SMilan Broz r = crypt_convert(cc, &io->ctx); 172372c6e7afSMikulas Patocka if (r < 0) 1724ef43aa38SMilan Broz io->error = r; 17255742fd77SMilan Broz 172640b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 172772c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 17283a7f6c99SMilan Broz 17293a7f6c99SMilan Broz crypt_dec_pending(io); 17308b004457SMilan Broz } 17318b004457SMilan Broz 173295497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 173395497a96SMilan Broz int error) 173495497a96SMilan Broz { 1735b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 1736b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 173795497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 173849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 173995497a96SMilan Broz 174054cea3f6SMilan Broz /* 174154cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 174254cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 174354cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 174454cea3f6SMilan Broz */ 1745c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 1746c0403ec0SRabin Vincent complete(&ctx->restart); 174795497a96SMilan Broz return; 1748c0403ec0SRabin Vincent } 174995497a96SMilan Broz 17502dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 1751ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 17522dc5327dSMilan Broz 1753ef43aa38SMilan Broz if (error == -EBADMSG) { 1754ef43aa38SMilan Broz DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", 1755ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); 1756ef43aa38SMilan Broz io->error = -EILSEQ; 1757ef43aa38SMilan Broz } else if (error < 0) 175872c6e7afSMikulas Patocka io->error = -EIO; 175972c6e7afSMikulas Patocka 1760298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 176195497a96SMilan Broz 176240b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 1763c0403ec0SRabin Vincent return; 176495497a96SMilan Broz 176595497a96SMilan Broz if (bio_data_dir(io->base_bio) == READ) 176672c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 176795497a96SMilan Broz else 176872c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 176995497a96SMilan Broz } 177095497a96SMilan Broz 17714e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 17724e4eef64SMilan Broz { 17734e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 17744e4eef64SMilan Broz 17754e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 17764e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 17774e4eef64SMilan Broz else 17784e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 17798b004457SMilan Broz } 17808b004457SMilan Broz 1781395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 1782395b167cSAlasdair G Kergon { 178349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1784395b167cSAlasdair G Kergon 1785395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 1786395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 1787395b167cSAlasdair G Kergon } 1788395b167cSAlasdair G Kergon 17891da177e4SLinus Torvalds /* 17901da177e4SLinus Torvalds * Decode key from its hex representation 17911da177e4SLinus Torvalds */ 17921da177e4SLinus Torvalds static int crypt_decode_key(u8 *key, char *hex, unsigned int size) 17931da177e4SLinus Torvalds { 17941da177e4SLinus Torvalds char buffer[3]; 17951da177e4SLinus Torvalds unsigned int i; 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds buffer[2] = '\0'; 17981da177e4SLinus Torvalds 17991da177e4SLinus Torvalds for (i = 0; i < size; i++) { 18001da177e4SLinus Torvalds buffer[0] = *hex++; 18011da177e4SLinus Torvalds buffer[1] = *hex++; 18021da177e4SLinus Torvalds 18031a66a08aSmajianpeng if (kstrtou8(buffer, 16, &key[i])) 18041da177e4SLinus Torvalds return -EINVAL; 18051da177e4SLinus Torvalds } 18061da177e4SLinus Torvalds 18071da177e4SLinus Torvalds if (*hex != '\0') 18081da177e4SLinus Torvalds return -EINVAL; 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds return 0; 18111da177e4SLinus Torvalds } 18121da177e4SLinus Torvalds 1813ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 1814ef43aa38SMilan Broz { 1815ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 1816ef43aa38SMilan Broz return; 1817ef43aa38SMilan Broz 1818ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1819ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 1820ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 1821ef43aa38SMilan Broz } 1822ef43aa38SMilan Broz 1823ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 1824ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 1825ef43aa38SMilan Broz } 1826ef43aa38SMilan Broz 1827ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 1828d1f96423SMilan Broz { 1829d1f96423SMilan Broz unsigned i; 1830d1f96423SMilan Broz 1831ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1832fd2d231fSMikulas Patocka return; 1833fd2d231fSMikulas Patocka 1834d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 1835ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 1836ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 1837ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 1838d1f96423SMilan Broz } 1839d1f96423SMilan Broz 1840ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 1841ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 1842fd2d231fSMikulas Patocka } 1843fd2d231fSMikulas Patocka 1844ef43aa38SMilan Broz static void crypt_free_tfms(struct crypt_config *cc) 1845ef43aa38SMilan Broz { 184633d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1847ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 1848ef43aa38SMilan Broz else 1849ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 1850ef43aa38SMilan Broz } 1851ef43aa38SMilan Broz 1852ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 1853d1f96423SMilan Broz { 1854d1f96423SMilan Broz unsigned i; 1855d1f96423SMilan Broz int err; 1856d1f96423SMilan Broz 1857ef43aa38SMilan Broz cc->cipher_tfm.tfms = kzalloc(cc->tfms_count * 1858ef43aa38SMilan Broz sizeof(struct crypto_skcipher *), GFP_KERNEL); 1859ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1860fd2d231fSMikulas Patocka return -ENOMEM; 1861fd2d231fSMikulas Patocka 1862d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 1863ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); 1864ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 1865ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 1866fd2d231fSMikulas Patocka crypt_free_tfms(cc); 1867d1f96423SMilan Broz return err; 1868d1f96423SMilan Broz } 1869d1f96423SMilan Broz } 1870d1f96423SMilan Broz 1871d1f96423SMilan Broz return 0; 1872d1f96423SMilan Broz } 1873d1f96423SMilan Broz 1874ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 1875ef43aa38SMilan Broz { 1876ef43aa38SMilan Broz int err; 1877ef43aa38SMilan Broz 1878ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 1879ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 1880ef43aa38SMilan Broz return -ENOMEM; 1881ef43aa38SMilan Broz 1882ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); 1883ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 1884ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 1885ef43aa38SMilan Broz crypt_free_tfms(cc); 1886ef43aa38SMilan Broz return err; 1887ef43aa38SMilan Broz } 1888ef43aa38SMilan Broz 1889ef43aa38SMilan Broz return 0; 1890ef43aa38SMilan Broz } 1891ef43aa38SMilan Broz 1892ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 1893ef43aa38SMilan Broz { 189433d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1895ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 1896ef43aa38SMilan Broz else 1897ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 1898ef43aa38SMilan Broz } 1899ef43aa38SMilan Broz 1900ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 1901ef43aa38SMilan Broz { 1902ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 1903ef43aa38SMilan Broz } 1904ef43aa38SMilan Broz 1905ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 1906ef43aa38SMilan Broz { 1907ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 1908ef43aa38SMilan Broz } 1909ef43aa38SMilan Broz 1910ef43aa38SMilan Broz /* 1911ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 1912ef43aa38SMilan Broz * the key must be for some reason in special format. 1913ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 1914ef43aa38SMilan Broz */ 1915ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 1916ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 1917ef43aa38SMilan Broz { 1918ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 1919ef43aa38SMilan Broz struct rtattr *rta; 1920ef43aa38SMilan Broz 1921ef43aa38SMilan Broz rta = (struct rtattr *)p; 1922ef43aa38SMilan Broz param = RTA_DATA(rta); 1923ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 1924ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 1925ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 1926ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 1927ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 1928ef43aa38SMilan Broz p += authkeylen; 1929ef43aa38SMilan Broz memcpy(p, key, enckeylen); 1930ef43aa38SMilan Broz } 1931ef43aa38SMilan Broz 1932671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 1933c0297721SAndi Kleen { 1934da31a078SMilan Broz unsigned subkey_size; 1935fd2d231fSMikulas Patocka int err = 0, i, r; 1936c0297721SAndi Kleen 1937da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 1938ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 1939da31a078SMilan Broz 1940ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1941ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 1942ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 1943ef43aa38SMilan Broz cc->key_mac_size); 1944d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 194533d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) 194633d2f09fSMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 194733d2f09fSMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 194833d2f09fSMilan Broz else if (crypt_integrity_aead(cc)) 1949ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 1950ef43aa38SMilan Broz cc->key + (i * subkey_size), 1951ef43aa38SMilan Broz subkey_size); 1952ef43aa38SMilan Broz else 1953ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 1954fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 1955fd2d231fSMikulas Patocka subkey_size); 1956c0297721SAndi Kleen if (r) 1957c0297721SAndi Kleen err = r; 1958c0297721SAndi Kleen } 1959c0297721SAndi Kleen 1960ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 1961ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 1962ef43aa38SMilan Broz 1963c0297721SAndi Kleen return err; 1964c0297721SAndi Kleen } 1965c0297721SAndi Kleen 1966c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 1967c538f6ecSOndrej Kozina 1968027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 1969027c431cSOndrej Kozina { 1970027c431cSOndrej Kozina while (*str) 1971027c431cSOndrej Kozina if (isspace(*str++)) 1972027c431cSOndrej Kozina return true; 1973027c431cSOndrej Kozina return false; 1974027c431cSOndrej Kozina } 1975027c431cSOndrej Kozina 1976c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 1977c538f6ecSOndrej Kozina { 1978c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 1979c538f6ecSOndrej Kozina int ret; 1980c538f6ecSOndrej Kozina struct key *key; 1981c538f6ecSOndrej Kozina const struct user_key_payload *ukp; 1982c538f6ecSOndrej Kozina 1983027c431cSOndrej Kozina /* 1984027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 1985027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 1986027c431cSOndrej Kozina */ 1987027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 1988027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 1989027c431cSOndrej Kozina return -EINVAL; 1990027c431cSOndrej Kozina } 1991027c431cSOndrej Kozina 1992c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 1993c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 1994c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 1995c538f6ecSOndrej Kozina return -EINVAL; 1996c538f6ecSOndrej Kozina 1997c538f6ecSOndrej Kozina if (strncmp(key_string, "logon:", key_desc - key_string + 1) && 1998c538f6ecSOndrej Kozina strncmp(key_string, "user:", key_desc - key_string + 1)) 1999c538f6ecSOndrej Kozina return -EINVAL; 2000c538f6ecSOndrej Kozina 2001c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2002c538f6ecSOndrej Kozina if (!new_key_string) 2003c538f6ecSOndrej Kozina return -ENOMEM; 2004c538f6ecSOndrej Kozina 2005c538f6ecSOndrej Kozina key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user, 2006c538f6ecSOndrej Kozina key_desc + 1, NULL); 2007c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2008c538f6ecSOndrej Kozina kzfree(new_key_string); 2009c538f6ecSOndrej Kozina return PTR_ERR(key); 2010c538f6ecSOndrej Kozina } 2011c538f6ecSOndrej Kozina 2012f5b0cba8SOndrej Kozina down_read(&key->sem); 2013c538f6ecSOndrej Kozina 20140837e49aSDavid Howells ukp = user_key_payload_locked(key); 2015c538f6ecSOndrej Kozina if (!ukp) { 2016f5b0cba8SOndrej Kozina up_read(&key->sem); 2017c538f6ecSOndrej Kozina key_put(key); 2018c538f6ecSOndrej Kozina kzfree(new_key_string); 2019c538f6ecSOndrej Kozina return -EKEYREVOKED; 2020c538f6ecSOndrej Kozina } 2021c538f6ecSOndrej Kozina 2022c538f6ecSOndrej Kozina if (cc->key_size != ukp->datalen) { 2023f5b0cba8SOndrej Kozina up_read(&key->sem); 2024c538f6ecSOndrej Kozina key_put(key); 2025c538f6ecSOndrej Kozina kzfree(new_key_string); 2026c538f6ecSOndrej Kozina return -EINVAL; 2027c538f6ecSOndrej Kozina } 2028c538f6ecSOndrej Kozina 2029c538f6ecSOndrej Kozina memcpy(cc->key, ukp->data, cc->key_size); 2030c538f6ecSOndrej Kozina 2031f5b0cba8SOndrej Kozina up_read(&key->sem); 2032c538f6ecSOndrej Kozina key_put(key); 2033c538f6ecSOndrej Kozina 2034c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2035c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2036c538f6ecSOndrej Kozina 2037c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2038c538f6ecSOndrej Kozina 2039c538f6ecSOndrej Kozina /* wipe the kernel key payload copy in each case */ 2040c538f6ecSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 2041c538f6ecSOndrej Kozina 2042c538f6ecSOndrej Kozina if (!ret) { 2043c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2044c538f6ecSOndrej Kozina kzfree(cc->key_string); 2045c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2046c538f6ecSOndrej Kozina } else 2047c538f6ecSOndrej Kozina kzfree(new_key_string); 2048c538f6ecSOndrej Kozina 2049c538f6ecSOndrej Kozina return ret; 2050c538f6ecSOndrej Kozina } 2051c538f6ecSOndrej Kozina 2052c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2053c538f6ecSOndrej Kozina { 2054c538f6ecSOndrej Kozina char *colon, dummy; 2055c538f6ecSOndrej Kozina int ret; 2056c538f6ecSOndrej Kozina 2057c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2058c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2059c538f6ecSOndrej Kozina 2060c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2061c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2062c538f6ecSOndrej Kozina if (!colon) 2063c538f6ecSOndrej Kozina return -EINVAL; 2064c538f6ecSOndrej Kozina 2065c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2066c538f6ecSOndrej Kozina return -EINVAL; 2067c538f6ecSOndrej Kozina 2068c538f6ecSOndrej Kozina *key_string = colon; 2069c538f6ecSOndrej Kozina 2070c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2071c538f6ecSOndrej Kozina 2072c538f6ecSOndrej Kozina return ret; 2073c538f6ecSOndrej Kozina } 2074c538f6ecSOndrej Kozina 2075c538f6ecSOndrej Kozina #else 2076c538f6ecSOndrej Kozina 2077c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2078c538f6ecSOndrej Kozina { 2079c538f6ecSOndrej Kozina return -EINVAL; 2080c538f6ecSOndrej Kozina } 2081c538f6ecSOndrej Kozina 2082c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2083c538f6ecSOndrej Kozina { 2084c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2085c538f6ecSOndrej Kozina } 2086c538f6ecSOndrej Kozina 2087c538f6ecSOndrej Kozina #endif 2088c538f6ecSOndrej Kozina 2089e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2090e48d4bbfSMilan Broz { 2091de8be5acSMilan Broz int r = -EINVAL; 2092de8be5acSMilan Broz int key_string_len = strlen(key); 2093de8be5acSMilan Broz 209469a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 209569a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2096de8be5acSMilan Broz goto out; 2097e48d4bbfSMilan Broz 2098c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2099c538f6ecSOndrej Kozina if (key[0] == ':') { 2100c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2101c538f6ecSOndrej Kozina goto out; 2102c538f6ecSOndrej Kozina } 2103c538f6ecSOndrej Kozina 2104265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2105265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2106265e9098SOndrej Kozina 2107c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2108c538f6ecSOndrej Kozina kzfree(cc->key_string); 2109c538f6ecSOndrej Kozina cc->key_string = NULL; 2110c538f6ecSOndrej Kozina 211169a8cfcdSMilan Broz if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) 2112de8be5acSMilan Broz goto out; 2113e48d4bbfSMilan Broz 2114671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2115265e9098SOndrej Kozina if (!r) 2116e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2117e48d4bbfSMilan Broz 2118de8be5acSMilan Broz out: 2119de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2120de8be5acSMilan Broz memset(key, '0', key_string_len); 2121de8be5acSMilan Broz 2122de8be5acSMilan Broz return r; 2123e48d4bbfSMilan Broz } 2124e48d4bbfSMilan Broz 2125e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2126e48d4bbfSMilan Broz { 2127e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2128e48d4bbfSMilan Broz memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2129c538f6ecSOndrej Kozina kzfree(cc->key_string); 2130c538f6ecSOndrej Kozina cc->key_string = NULL; 2131c0297721SAndi Kleen 2132671ea6b4SMikulas Patocka return crypt_setkey(cc); 2133e48d4bbfSMilan Broz } 2134e48d4bbfSMilan Broz 213528513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 213628513fccSMilan Broz { 213728513fccSMilan Broz struct crypt_config *cc = ti->private; 213828513fccSMilan Broz 213928513fccSMilan Broz ti->private = NULL; 214028513fccSMilan Broz 214128513fccSMilan Broz if (!cc) 214228513fccSMilan Broz return; 214328513fccSMilan Broz 2144f659b100SRabin Vincent if (cc->write_thread) 2145dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2146dc267621SMikulas Patocka 214728513fccSMilan Broz if (cc->io_queue) 214828513fccSMilan Broz destroy_workqueue(cc->io_queue); 214928513fccSMilan Broz if (cc->crypt_queue) 215028513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 215128513fccSMilan Broz 2152fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2153fd2d231fSMikulas Patocka 215428513fccSMilan Broz if (cc->bs) 215528513fccSMilan Broz bioset_free(cc->bs); 215628513fccSMilan Broz 215728513fccSMilan Broz mempool_destroy(cc->page_pool); 215828513fccSMilan Broz mempool_destroy(cc->req_pool); 2159ef43aa38SMilan Broz mempool_destroy(cc->tag_pool); 216028513fccSMilan Broz 216128513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 216228513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 216328513fccSMilan Broz 216428513fccSMilan Broz if (cc->dev) 216528513fccSMilan Broz dm_put_device(ti, cc->dev); 216628513fccSMilan Broz 21675ebaee6dSMilan Broz kzfree(cc->cipher); 21687dbcd137SMilan Broz kzfree(cc->cipher_string); 2169c538f6ecSOndrej Kozina kzfree(cc->key_string); 2170ef43aa38SMilan Broz kzfree(cc->cipher_auth); 2171ef43aa38SMilan Broz kzfree(cc->authenc_key); 217228513fccSMilan Broz 217328513fccSMilan Broz /* Must zero key material before freeing */ 217428513fccSMilan Broz kzfree(cc); 217528513fccSMilan Broz } 217628513fccSMilan Broz 2177e889f97aSMilan Broz static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 2178e889f97aSMilan Broz { 2179e889f97aSMilan Broz struct crypt_config *cc = ti->private; 2180e889f97aSMilan Broz 218133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2182e889f97aSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2183e889f97aSMilan Broz else 2184e889f97aSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2185e889f97aSMilan Broz 2186e889f97aSMilan Broz if (cc->iv_size) 2187e889f97aSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 2188e889f97aSMilan Broz cc->iv_size = max(cc->iv_size, 2189e889f97aSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 2190e889f97aSMilan Broz else if (ivmode) { 2191e889f97aSMilan Broz DMWARN("Selected cipher does not support IVs"); 2192e889f97aSMilan Broz ivmode = NULL; 2193e889f97aSMilan Broz } 2194e889f97aSMilan Broz 2195e889f97aSMilan Broz /* Choose ivmode, see comments at iv code. */ 2196e889f97aSMilan Broz if (ivmode == NULL) 2197e889f97aSMilan Broz cc->iv_gen_ops = NULL; 2198e889f97aSMilan Broz else if (strcmp(ivmode, "plain") == 0) 2199e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_plain_ops; 2200e889f97aSMilan Broz else if (strcmp(ivmode, "plain64") == 0) 2201e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 2202e889f97aSMilan Broz else if (strcmp(ivmode, "essiv") == 0) 2203e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_essiv_ops; 2204e889f97aSMilan Broz else if (strcmp(ivmode, "benbi") == 0) 2205e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_benbi_ops; 2206e889f97aSMilan Broz else if (strcmp(ivmode, "null") == 0) 2207e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_null_ops; 2208e889f97aSMilan Broz else if (strcmp(ivmode, "lmk") == 0) { 2209e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2210e889f97aSMilan Broz /* 2211e889f97aSMilan Broz * Version 2 and 3 is recognised according 2212e889f97aSMilan Broz * to length of provided multi-key string. 2213e889f97aSMilan Broz * If present (version 3), last key is used as IV seed. 2214e889f97aSMilan Broz * All keys (including IV seed) are always the same size. 2215e889f97aSMilan Broz */ 2216e889f97aSMilan Broz if (cc->key_size % cc->key_parts) { 2217e889f97aSMilan Broz cc->key_parts++; 2218e889f97aSMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2219e889f97aSMilan Broz } 2220e889f97aSMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2221e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2222e889f97aSMilan Broz cc->key_parts += 2; /* IV + whitening */ 2223e889f97aSMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2224e889f97aSMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2225e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2226e889f97aSMilan Broz /* Need storage space in integrity fields. */ 2227e889f97aSMilan Broz cc->integrity_iv_size = cc->iv_size; 2228e889f97aSMilan Broz } else { 2229e889f97aSMilan Broz ti->error = "Invalid IV mode"; 2230e889f97aSMilan Broz return -EINVAL; 2231e889f97aSMilan Broz } 2232e889f97aSMilan Broz 2233e889f97aSMilan Broz return 0; 2234e889f97aSMilan Broz } 2235e889f97aSMilan Broz 223633d2f09fSMilan Broz /* 223733d2f09fSMilan Broz * Workaround to parse cipher algorithm from crypto API spec. 223833d2f09fSMilan Broz * The cc->cipher is currently used only in ESSIV. 223933d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 224033d2f09fSMilan Broz */ 224133d2f09fSMilan Broz static int crypt_ctr_blkdev_cipher(struct crypt_config *cc) 224233d2f09fSMilan Broz { 224333d2f09fSMilan Broz const char *alg_name = NULL; 224433d2f09fSMilan Broz char *start, *end; 224533d2f09fSMilan Broz 224633d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 224733d2f09fSMilan Broz alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc))); 224833d2f09fSMilan Broz if (!alg_name) 224933d2f09fSMilan Broz return -EINVAL; 225033d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) { 225133d2f09fSMilan Broz alg_name = strchr(alg_name, ','); 225233d2f09fSMilan Broz if (!alg_name) 225333d2f09fSMilan Broz return -EINVAL; 225433d2f09fSMilan Broz } 225533d2f09fSMilan Broz alg_name++; 225633d2f09fSMilan Broz } else { 225733d2f09fSMilan Broz alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc))); 225833d2f09fSMilan Broz if (!alg_name) 225933d2f09fSMilan Broz return -EINVAL; 226033d2f09fSMilan Broz } 226133d2f09fSMilan Broz 226233d2f09fSMilan Broz start = strchr(alg_name, '('); 226333d2f09fSMilan Broz end = strchr(alg_name, ')'); 226433d2f09fSMilan Broz 226533d2f09fSMilan Broz if (!start && !end) { 226633d2f09fSMilan Broz cc->cipher = kstrdup(alg_name, GFP_KERNEL); 226733d2f09fSMilan Broz return cc->cipher ? 0 : -ENOMEM; 226833d2f09fSMilan Broz } 226933d2f09fSMilan Broz 227033d2f09fSMilan Broz if (!start || !end || ++start >= end) 227133d2f09fSMilan Broz return -EINVAL; 227233d2f09fSMilan Broz 227333d2f09fSMilan Broz cc->cipher = kzalloc(end - start + 1, GFP_KERNEL); 227433d2f09fSMilan Broz if (!cc->cipher) 227533d2f09fSMilan Broz return -ENOMEM; 227633d2f09fSMilan Broz 227733d2f09fSMilan Broz strncpy(cc->cipher, start, end - start); 227833d2f09fSMilan Broz 227933d2f09fSMilan Broz return 0; 228033d2f09fSMilan Broz } 228133d2f09fSMilan Broz 228233d2f09fSMilan Broz /* 228333d2f09fSMilan Broz * Workaround to parse HMAC algorithm from AEAD crypto API spec. 228433d2f09fSMilan Broz * The HMAC is needed to calculate tag size (HMAC digest size). 228533d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 228633d2f09fSMilan Broz */ 228733d2f09fSMilan Broz static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 228833d2f09fSMilan Broz { 228933d2f09fSMilan Broz char *start, *end, *mac_alg = NULL; 229033d2f09fSMilan Broz struct crypto_ahash *mac; 229133d2f09fSMilan Broz 229233d2f09fSMilan Broz if (!strstarts(cipher_api, "authenc(")) 229333d2f09fSMilan Broz return 0; 229433d2f09fSMilan Broz 229533d2f09fSMilan Broz start = strchr(cipher_api, '('); 229633d2f09fSMilan Broz end = strchr(cipher_api, ','); 229733d2f09fSMilan Broz if (!start || !end || ++start > end) 229833d2f09fSMilan Broz return -EINVAL; 229933d2f09fSMilan Broz 230033d2f09fSMilan Broz mac_alg = kzalloc(end - start + 1, GFP_KERNEL); 230133d2f09fSMilan Broz if (!mac_alg) 230233d2f09fSMilan Broz return -ENOMEM; 230333d2f09fSMilan Broz strncpy(mac_alg, start, end - start); 230433d2f09fSMilan Broz 230533d2f09fSMilan Broz mac = crypto_alloc_ahash(mac_alg, 0, 0); 230633d2f09fSMilan Broz kfree(mac_alg); 230733d2f09fSMilan Broz 230833d2f09fSMilan Broz if (IS_ERR(mac)) 230933d2f09fSMilan Broz return PTR_ERR(mac); 231033d2f09fSMilan Broz 231133d2f09fSMilan Broz cc->key_mac_size = crypto_ahash_digestsize(mac); 231233d2f09fSMilan Broz crypto_free_ahash(mac); 231333d2f09fSMilan Broz 231433d2f09fSMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 231533d2f09fSMilan Broz if (!cc->authenc_key) 231633d2f09fSMilan Broz return -ENOMEM; 231733d2f09fSMilan Broz 231833d2f09fSMilan Broz return 0; 231933d2f09fSMilan Broz } 232033d2f09fSMilan Broz 232133d2f09fSMilan Broz static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 232233d2f09fSMilan Broz char **ivmode, char **ivopts) 23231da177e4SLinus Torvalds { 23245ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 232533d2f09fSMilan Broz char *tmp, *cipher_api; 232633d2f09fSMilan Broz int ret = -EINVAL; 232733d2f09fSMilan Broz 232833d2f09fSMilan Broz cc->tfms_count = 1; 232933d2f09fSMilan Broz 233033d2f09fSMilan Broz /* 233133d2f09fSMilan Broz * New format (capi: prefix) 233233d2f09fSMilan Broz * capi:cipher_api_spec-iv:ivopts 233333d2f09fSMilan Broz */ 233433d2f09fSMilan Broz tmp = &cipher_in[strlen("capi:")]; 233533d2f09fSMilan Broz cipher_api = strsep(&tmp, "-"); 233633d2f09fSMilan Broz *ivmode = strsep(&tmp, ":"); 233733d2f09fSMilan Broz *ivopts = tmp; 233833d2f09fSMilan Broz 233933d2f09fSMilan Broz if (*ivmode && !strcmp(*ivmode, "lmk")) 234033d2f09fSMilan Broz cc->tfms_count = 64; 234133d2f09fSMilan Broz 234233d2f09fSMilan Broz cc->key_parts = cc->tfms_count; 234333d2f09fSMilan Broz 234433d2f09fSMilan Broz /* Allocate cipher */ 234533d2f09fSMilan Broz ret = crypt_alloc_tfms(cc, cipher_api); 234633d2f09fSMilan Broz if (ret < 0) { 234733d2f09fSMilan Broz ti->error = "Error allocating crypto tfm"; 234833d2f09fSMilan Broz return ret; 234933d2f09fSMilan Broz } 235033d2f09fSMilan Broz 235133d2f09fSMilan Broz /* Alloc AEAD, can be used only in new format. */ 235233d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 235333d2f09fSMilan Broz ret = crypt_ctr_auth_cipher(cc, cipher_api); 235433d2f09fSMilan Broz if (ret < 0) { 235533d2f09fSMilan Broz ti->error = "Invalid AEAD cipher spec"; 235633d2f09fSMilan Broz return -ENOMEM; 235733d2f09fSMilan Broz } 235833d2f09fSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 235933d2f09fSMilan Broz } else 236033d2f09fSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 236133d2f09fSMilan Broz 236233d2f09fSMilan Broz ret = crypt_ctr_blkdev_cipher(cc); 236333d2f09fSMilan Broz if (ret < 0) { 236433d2f09fSMilan Broz ti->error = "Cannot allocate cipher string"; 236533d2f09fSMilan Broz return -ENOMEM; 236633d2f09fSMilan Broz } 236733d2f09fSMilan Broz 236833d2f09fSMilan Broz return 0; 236933d2f09fSMilan Broz } 237033d2f09fSMilan Broz 237133d2f09fSMilan Broz static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 237233d2f09fSMilan Broz char **ivmode, char **ivopts) 237333d2f09fSMilan Broz { 237433d2f09fSMilan Broz struct crypt_config *cc = ti->private; 237533d2f09fSMilan Broz char *tmp, *cipher, *chainmode, *keycount; 23765ebaee6dSMilan Broz char *cipher_api = NULL; 2377fd2d231fSMikulas Patocka int ret = -EINVAL; 237831998ef1SMikulas Patocka char dummy; 23791da177e4SLinus Torvalds 238033d2f09fSMilan Broz if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 23815ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 23821da177e4SLinus Torvalds return -EINVAL; 23831da177e4SLinus Torvalds } 23841da177e4SLinus Torvalds 23855ebaee6dSMilan Broz /* 23865ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 2387d1f96423SMilan Broz * cipher[:keycount]-mode-iv:ivopts 23885ebaee6dSMilan Broz */ 23895ebaee6dSMilan Broz tmp = cipher_in; 2390d1f96423SMilan Broz keycount = strsep(&tmp, "-"); 2391d1f96423SMilan Broz cipher = strsep(&keycount, ":"); 2392d1f96423SMilan Broz 2393d1f96423SMilan Broz if (!keycount) 2394d1f96423SMilan Broz cc->tfms_count = 1; 239531998ef1SMikulas Patocka else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 2396d1f96423SMilan Broz !is_power_of_2(cc->tfms_count)) { 2397d1f96423SMilan Broz ti->error = "Bad cipher key count specification"; 2398d1f96423SMilan Broz return -EINVAL; 2399d1f96423SMilan Broz } 2400d1f96423SMilan Broz cc->key_parts = cc->tfms_count; 24015ebaee6dSMilan Broz 24025ebaee6dSMilan Broz cc->cipher = kstrdup(cipher, GFP_KERNEL); 24035ebaee6dSMilan Broz if (!cc->cipher) 24045ebaee6dSMilan Broz goto bad_mem; 24055ebaee6dSMilan Broz 24061da177e4SLinus Torvalds chainmode = strsep(&tmp, "-"); 240733d2f09fSMilan Broz *ivopts = strsep(&tmp, "-"); 240833d2f09fSMilan Broz *ivmode = strsep(&*ivopts, ":"); 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds if (tmp) 24115ebaee6dSMilan Broz DMWARN("Ignoring unexpected additional cipher options"); 24121da177e4SLinus Torvalds 24137dbcd137SMilan Broz /* 24147dbcd137SMilan Broz * For compatibility with the original dm-crypt mapping format, if 24157dbcd137SMilan Broz * only the cipher name is supplied, use cbc-plain. 24167dbcd137SMilan Broz */ 241733d2f09fSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 24181da177e4SLinus Torvalds chainmode = "cbc"; 241933d2f09fSMilan Broz *ivmode = "plain"; 24201da177e4SLinus Torvalds } 24211da177e4SLinus Torvalds 242233d2f09fSMilan Broz if (strcmp(chainmode, "ecb") && !*ivmode) { 24235ebaee6dSMilan Broz ti->error = "IV mechanism required"; 24245ebaee6dSMilan Broz return -EINVAL; 24251da177e4SLinus Torvalds } 24261da177e4SLinus Torvalds 24275ebaee6dSMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 24285ebaee6dSMilan Broz if (!cipher_api) 24295ebaee6dSMilan Broz goto bad_mem; 24305ebaee6dSMilan Broz 24315ebaee6dSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 24325ebaee6dSMilan Broz "%s(%s)", chainmode, cipher); 24335ebaee6dSMilan Broz if (ret < 0) { 24345ebaee6dSMilan Broz kfree(cipher_api); 24355ebaee6dSMilan Broz goto bad_mem; 2436d1806f6aSHerbert Xu } 2437d1806f6aSHerbert Xu 24385ebaee6dSMilan Broz /* Allocate cipher */ 2439fd2d231fSMikulas Patocka ret = crypt_alloc_tfms(cc, cipher_api); 2440d1f96423SMilan Broz if (ret < 0) { 244172d94861SAlasdair G Kergon ti->error = "Error allocating crypto tfm"; 244233d2f09fSMilan Broz kfree(cipher_api); 244333d2f09fSMilan Broz return ret; 24441da177e4SLinus Torvalds } 24451da177e4SLinus Torvalds 244633d2f09fSMilan Broz return 0; 244733d2f09fSMilan Broz bad_mem: 244833d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 244933d2f09fSMilan Broz return -ENOMEM; 245033d2f09fSMilan Broz } 245133d2f09fSMilan Broz 245233d2f09fSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 245333d2f09fSMilan Broz { 245433d2f09fSMilan Broz struct crypt_config *cc = ti->private; 245533d2f09fSMilan Broz char *ivmode = NULL, *ivopts = NULL; 245633d2f09fSMilan Broz int ret; 245733d2f09fSMilan Broz 245833d2f09fSMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 245933d2f09fSMilan Broz if (!cc->cipher_string) { 246033d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 246133d2f09fSMilan Broz return -ENOMEM; 246233d2f09fSMilan Broz } 246333d2f09fSMilan Broz 246433d2f09fSMilan Broz if (strstarts(cipher_in, "capi:")) 246533d2f09fSMilan Broz ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 246633d2f09fSMilan Broz else 246733d2f09fSMilan Broz ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 246833d2f09fSMilan Broz if (ret) 246933d2f09fSMilan Broz return ret; 247033d2f09fSMilan Broz 24715ebaee6dSMilan Broz /* Initialize IV */ 2472e889f97aSMilan Broz ret = crypt_ctr_ivmode(ti, ivmode); 2473e889f97aSMilan Broz if (ret < 0) 247433d2f09fSMilan Broz return ret; 24751da177e4SLinus Torvalds 2476da31a078SMilan Broz /* Initialize and set key */ 2477da31a078SMilan Broz ret = crypt_set_key(cc, key); 2478da31a078SMilan Broz if (ret < 0) { 2479da31a078SMilan Broz ti->error = "Error decoding and setting key"; 248033d2f09fSMilan Broz return ret; 2481da31a078SMilan Broz } 2482da31a078SMilan Broz 248328513fccSMilan Broz /* Allocate IV */ 248428513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 248528513fccSMilan Broz ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 248628513fccSMilan Broz if (ret < 0) { 248728513fccSMilan Broz ti->error = "Error creating IV"; 248833d2f09fSMilan Broz return ret; 248928513fccSMilan Broz } 249028513fccSMilan Broz } 24911da177e4SLinus Torvalds 249228513fccSMilan Broz /* Initialize IV (set keys for ESSIV etc) */ 249328513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 249428513fccSMilan Broz ret = cc->iv_gen_ops->init(cc); 249528513fccSMilan Broz if (ret < 0) { 2496b95bf2d3SMilan Broz ti->error = "Error initialising IV"; 24975ebaee6dSMilan Broz return ret; 249833d2f09fSMilan Broz } 249933d2f09fSMilan Broz } 25005ebaee6dSMilan Broz 250133d2f09fSMilan Broz return ret; 25021da177e4SLinus Torvalds } 25035ebaee6dSMilan Broz 2504ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 2505ef43aa38SMilan Broz { 2506ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 2507ef43aa38SMilan Broz struct dm_arg_set as; 2508ef43aa38SMilan Broz static struct dm_arg _args[] = { 2509ef43aa38SMilan Broz {0, 3, "Invalid number of feature args"}, 2510ef43aa38SMilan Broz }; 2511ef43aa38SMilan Broz unsigned int opt_params, val; 2512ef43aa38SMilan Broz const char *opt_string, *sval; 2513ef43aa38SMilan Broz int ret; 2514ef43aa38SMilan Broz 2515ef43aa38SMilan Broz /* Optional parameters */ 2516ef43aa38SMilan Broz as.argc = argc; 2517ef43aa38SMilan Broz as.argv = argv; 2518ef43aa38SMilan Broz 2519ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 2520ef43aa38SMilan Broz if (ret) 2521ef43aa38SMilan Broz return ret; 2522ef43aa38SMilan Broz 2523ef43aa38SMilan Broz while (opt_params--) { 2524ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 2525ef43aa38SMilan Broz if (!opt_string) { 2526ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 2527ef43aa38SMilan Broz return -EINVAL; 2528ef43aa38SMilan Broz } 2529ef43aa38SMilan Broz 2530ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 2531ef43aa38SMilan Broz ti->num_discard_bios = 1; 2532ef43aa38SMilan Broz 2533ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 2534ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 2535ef43aa38SMilan Broz 2536ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 2537ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2538ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 2539ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 2540ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 2541ef43aa38SMilan Broz return -EINVAL; 2542ef43aa38SMilan Broz } 2543ef43aa38SMilan Broz cc->on_disk_tag_size = val; 2544ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 2545ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 2546ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 2547ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 2548ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 2549ef43aa38SMilan Broz return -EINVAL; 2550ef43aa38SMilan Broz } 2551ef43aa38SMilan Broz 2552ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 2553ef43aa38SMilan Broz if (!cc->cipher_auth) 2554ef43aa38SMilan Broz return -ENOMEM; 2555ef43aa38SMilan Broz } else { 2556ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 2557ef43aa38SMilan Broz return -EINVAL; 2558ef43aa38SMilan Broz } 2559ef43aa38SMilan Broz } 2560ef43aa38SMilan Broz 2561ef43aa38SMilan Broz return 0; 2562ef43aa38SMilan Broz } 2563ef43aa38SMilan Broz 25645ebaee6dSMilan Broz /* 25655ebaee6dSMilan Broz * Construct an encryption mapping: 2566c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 25675ebaee6dSMilan Broz */ 25685ebaee6dSMilan Broz static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 25695ebaee6dSMilan Broz { 25705ebaee6dSMilan Broz struct crypt_config *cc; 2571c538f6ecSOndrej Kozina int key_size; 2572ef43aa38SMilan Broz unsigned int align_mask; 25735ebaee6dSMilan Broz unsigned long long tmpll; 25745ebaee6dSMilan Broz int ret; 2575ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 257631998ef1SMikulas Patocka char dummy; 25775ebaee6dSMilan Broz 2578772ae5f5SMilan Broz if (argc < 5) { 25795ebaee6dSMilan Broz ti->error = "Not enough arguments"; 25805ebaee6dSMilan Broz return -EINVAL; 25811da177e4SLinus Torvalds } 25821da177e4SLinus Torvalds 2583c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 2584c538f6ecSOndrej Kozina if (key_size < 0) { 2585c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 2586c538f6ecSOndrej Kozina return -EINVAL; 2587c538f6ecSOndrej Kozina } 25885ebaee6dSMilan Broz 25895ebaee6dSMilan Broz cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); 25905ebaee6dSMilan Broz if (!cc) { 25915ebaee6dSMilan Broz ti->error = "Cannot allocate encryption context"; 25925ebaee6dSMilan Broz return -ENOMEM; 25935ebaee6dSMilan Broz } 259469a8cfcdSMilan Broz cc->key_size = key_size; 25955ebaee6dSMilan Broz 25965ebaee6dSMilan Broz ti->private = cc; 2597ef43aa38SMilan Broz 2598ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 2599ef43aa38SMilan Broz if (argc > 5) { 2600ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 2601ef43aa38SMilan Broz if (ret) 2602ef43aa38SMilan Broz goto bad; 2603ef43aa38SMilan Broz } 2604ef43aa38SMilan Broz 26055ebaee6dSMilan Broz ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 26065ebaee6dSMilan Broz if (ret < 0) 26075ebaee6dSMilan Broz goto bad; 26085ebaee6dSMilan Broz 260933d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 2610ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 2611ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 2612ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 2613ef43aa38SMilan Broz } else { 2614bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 2615bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 2616ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 2617ef43aa38SMilan Broz } 2618d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 2619d49ec52fSMikulas Patocka 2620ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 2621d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 2622d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 2623ef43aa38SMilan Broz & align_mask; 2624d49ec52fSMikulas Patocka } else { 2625d49ec52fSMikulas Patocka /* 2626d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 2627d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 2628d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 2629d49ec52fSMikulas Patocka */ 2630ef43aa38SMilan Broz iv_size_padding = align_mask; 2631d49ec52fSMikulas Patocka } 2632ddd42edfSMilan Broz 263394f5e024SMikulas Patocka ret = -ENOMEM; 2634ef43aa38SMilan Broz 2635ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 2636ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 2637ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 2638ef43aa38SMilan Broz cc->iv_size + 2639ef43aa38SMilan Broz sizeof(uint64_t) + 2640ef43aa38SMilan Broz sizeof(unsigned int); 2641ef43aa38SMilan Broz 2642ef43aa38SMilan Broz cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size); 2643ddd42edfSMilan Broz if (!cc->req_pool) { 2644ddd42edfSMilan Broz ti->error = "Cannot allocate crypt request mempool"; 264528513fccSMilan Broz goto bad; 2646ddd42edfSMilan Broz } 2647ddd42edfSMilan Broz 264830187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 2649ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 2650d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 2651298a9fa0SMikulas Patocka 2652cf2f1abfSMikulas Patocka cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); 26531da177e4SLinus Torvalds if (!cc->page_pool) { 265472d94861SAlasdair G Kergon ti->error = "Cannot allocate page mempool"; 265528513fccSMilan Broz goto bad; 26561da177e4SLinus Torvalds } 26571da177e4SLinus Torvalds 2658bb799ca0SJens Axboe cc->bs = bioset_create(MIN_IOS, 0); 26596a24c718SMilan Broz if (!cc->bs) { 26606a24c718SMilan Broz ti->error = "Cannot allocate crypt bioset"; 266128513fccSMilan Broz goto bad; 26626a24c718SMilan Broz } 26636a24c718SMilan Broz 26647145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 26657145c241SMikulas Patocka 266628513fccSMilan Broz ret = -EINVAL; 266731998ef1SMikulas Patocka if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { 266872d94861SAlasdair G Kergon ti->error = "Invalid iv_offset sector"; 266928513fccSMilan Broz goto bad; 26701da177e4SLinus Torvalds } 26714ee218cdSAndrew Morton cc->iv_offset = tmpll; 26721da177e4SLinus Torvalds 2673e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 2674e80d1c80SVivek Goyal if (ret) { 267528513fccSMilan Broz ti->error = "Device lookup failed"; 267628513fccSMilan Broz goto bad; 267728513fccSMilan Broz } 267828513fccSMilan Broz 2679e80d1c80SVivek Goyal ret = -EINVAL; 268031998ef1SMikulas Patocka if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { 268172d94861SAlasdair G Kergon ti->error = "Invalid device sector"; 268228513fccSMilan Broz goto bad; 26831da177e4SLinus Torvalds } 26844ee218cdSAndrew Morton cc->start = tmpll; 26851da177e4SLinus Torvalds 268633d2f09fSMilan Broz if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 2687ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 2688772ae5f5SMilan Broz if (ret) 2689772ae5f5SMilan Broz goto bad; 2690772ae5f5SMilan Broz 2691ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 2692ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 2693ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 2694ef43aa38SMilan Broz 2695ef43aa38SMilan Broz cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS, 2696ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 2697ef43aa38SMilan Broz if (!cc->tag_pool) { 2698ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 2699f3396c58SMikulas Patocka goto bad; 2700f3396c58SMikulas Patocka } 2701f3396c58SMikulas Patocka } 2702772ae5f5SMilan Broz 270328513fccSMilan Broz ret = -ENOMEM; 2704670368a8STejun Heo cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); 2705cabf08e4SMilan Broz if (!cc->io_queue) { 2706cabf08e4SMilan Broz ti->error = "Couldn't create kcryptd io queue"; 270728513fccSMilan Broz goto bad; 2708cabf08e4SMilan Broz } 2709cabf08e4SMilan Broz 2710f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2711f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); 2712f3396c58SMikulas Patocka else 2713f3396c58SMikulas Patocka cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 2714f3396c58SMikulas Patocka num_online_cpus()); 2715cabf08e4SMilan Broz if (!cc->crypt_queue) { 27169934a8beSMilan Broz ti->error = "Couldn't create kcryptd queue"; 271728513fccSMilan Broz goto bad; 27189934a8beSMilan Broz } 27199934a8beSMilan Broz 2720dc267621SMikulas Patocka init_waitqueue_head(&cc->write_thread_wait); 2721b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 2722dc267621SMikulas Patocka 2723dc267621SMikulas Patocka cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write"); 2724dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 2725dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 2726dc267621SMikulas Patocka cc->write_thread = NULL; 2727dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 2728dc267621SMikulas Patocka goto bad; 2729dc267621SMikulas Patocka } 2730dc267621SMikulas Patocka wake_up_process(cc->write_thread); 2731dc267621SMikulas Patocka 273255a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 27330ac55489SAlasdair G Kergon ti->discard_zeroes_data_unsupported = true; 2734983c7db3SMilan Broz 27351da177e4SLinus Torvalds return 0; 27361da177e4SLinus Torvalds 273728513fccSMilan Broz bad: 273828513fccSMilan Broz crypt_dtr(ti); 273928513fccSMilan Broz return ret; 27401da177e4SLinus Torvalds } 27411da177e4SLinus Torvalds 27427de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 27431da177e4SLinus Torvalds { 2744028867acSAlasdair G Kergon struct dm_crypt_io *io; 274549a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 2746647c7db1SMikulas Patocka 2747772ae5f5SMilan Broz /* 274828a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 274928a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 2750e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 2751772ae5f5SMilan Broz */ 27521eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 275328a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 2754647c7db1SMikulas Patocka bio->bi_bdev = cc->dev->bdev; 2755772ae5f5SMilan Broz if (bio_sectors(bio)) 27564f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 27574f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 2758647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 2759647c7db1SMikulas Patocka } 27601da177e4SLinus Torvalds 27614e870e94SMikulas Patocka /* 27624e870e94SMikulas Patocka * Check if bio is too large, split as needed. 27634e870e94SMikulas Patocka */ 27644e870e94SMikulas Patocka if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && 2765ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 27664e870e94SMikulas Patocka dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); 27674e870e94SMikulas Patocka 2768298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 2769298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 2770ef43aa38SMilan Broz 2771ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 2772ef43aa38SMilan Broz unsigned tag_len = cc->on_disk_tag_size * bio_sectors(bio); 2773ef43aa38SMilan Broz 2774ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 2775ef43aa38SMilan Broz unlikely(!(io->integrity_metadata = kmalloc(tag_len, 2776ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 2777ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 2778ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 2779ef43aa38SMilan Broz io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO); 2780ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 2781ef43aa38SMilan Broz } 2782ef43aa38SMilan Broz } 2783ef43aa38SMilan Broz 278433d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2785ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 2786ef43aa38SMilan Broz else 2787ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 2788cabf08e4SMilan Broz 278920c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 279020c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 2791dc267621SMikulas Patocka kcryptd_queue_read(io); 279220c82538SMilan Broz } else 2793cabf08e4SMilan Broz kcryptd_queue_crypt(io); 27941da177e4SLinus Torvalds 2795d2a7ad29SKiyoshi Ueda return DM_MAPIO_SUBMITTED; 27961da177e4SLinus Torvalds } 27971da177e4SLinus Torvalds 2798fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 27991f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 28001da177e4SLinus Torvalds { 28015ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2802fd7c092eSMikulas Patocka unsigned i, sz = 0; 2803f3396c58SMikulas Patocka int num_feature_args = 0; 28041da177e4SLinus Torvalds 28051da177e4SLinus Torvalds switch (type) { 28061da177e4SLinus Torvalds case STATUSTYPE_INFO: 28071da177e4SLinus Torvalds result[0] = '\0'; 28081da177e4SLinus Torvalds break; 28091da177e4SLinus Torvalds 28101da177e4SLinus Torvalds case STATUSTYPE_TABLE: 28117dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 28121da177e4SLinus Torvalds 2813c538f6ecSOndrej Kozina if (cc->key_size > 0) { 2814c538f6ecSOndrej Kozina if (cc->key_string) 2815c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 2816c538f6ecSOndrej Kozina else 2817fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 2818fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 2819c538f6ecSOndrej Kozina } else 2820fd7c092eSMikulas Patocka DMEMIT("-"); 28211da177e4SLinus Torvalds 28224ee218cdSAndrew Morton DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 28234ee218cdSAndrew Morton cc->dev->name, (unsigned long long)cc->start); 2824772ae5f5SMilan Broz 2825f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 2826f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 28270f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2828ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2829ef43aa38SMilan Broz num_feature_args++; 2830f3396c58SMikulas Patocka if (num_feature_args) { 2831f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 283255a62eefSAlasdair G Kergon if (ti->num_discard_bios) 2833f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 2834f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 2835f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 28360f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 28370f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 2838ef43aa38SMilan Broz if (cc->on_disk_tag_size) 2839ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 2840f3396c58SMikulas Patocka } 2841772ae5f5SMilan Broz 28421da177e4SLinus Torvalds break; 28431da177e4SLinus Torvalds } 28441da177e4SLinus Torvalds } 28451da177e4SLinus Torvalds 2846e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 2847e48d4bbfSMilan Broz { 2848e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2849e48d4bbfSMilan Broz 2850e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2851e48d4bbfSMilan Broz } 2852e48d4bbfSMilan Broz 2853e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 2854e48d4bbfSMilan Broz { 2855e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2856e48d4bbfSMilan Broz 2857e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 2858e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 2859e48d4bbfSMilan Broz return -EAGAIN; 2860e48d4bbfSMilan Broz } 2861e48d4bbfSMilan Broz 2862e48d4bbfSMilan Broz return 0; 2863e48d4bbfSMilan Broz } 2864e48d4bbfSMilan Broz 2865e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 2866e48d4bbfSMilan Broz { 2867e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2868e48d4bbfSMilan Broz 2869e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 2870e48d4bbfSMilan Broz } 2871e48d4bbfSMilan Broz 2872e48d4bbfSMilan Broz /* Message interface 2873e48d4bbfSMilan Broz * key set <key> 2874e48d4bbfSMilan Broz * key wipe 2875e48d4bbfSMilan Broz */ 2876e48d4bbfSMilan Broz static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) 2877e48d4bbfSMilan Broz { 2878e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 2879c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 2880e48d4bbfSMilan Broz 2881e48d4bbfSMilan Broz if (argc < 2) 2882e48d4bbfSMilan Broz goto error; 2883e48d4bbfSMilan Broz 2884498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 2885e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 2886e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 2887e48d4bbfSMilan Broz return -EINVAL; 2888e48d4bbfSMilan Broz } 2889498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 2890c538f6ecSOndrej Kozina /* The key size may not be changed. */ 2891c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 2892c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 2893c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 2894c538f6ecSOndrej Kozina return -EINVAL; 2895c538f6ecSOndrej Kozina } 2896c538f6ecSOndrej Kozina 2897542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 2898542da317SMilan Broz if (ret) 2899542da317SMilan Broz return ret; 2900542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 2901542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 2902542da317SMilan Broz return ret; 2903542da317SMilan Broz } 2904498f0103SMike Snitzer if (argc == 2 && !strcasecmp(argv[1], "wipe")) { 2905542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 2906542da317SMilan Broz ret = cc->iv_gen_ops->wipe(cc); 2907542da317SMilan Broz if (ret) 2908542da317SMilan Broz return ret; 2909542da317SMilan Broz } 2910e48d4bbfSMilan Broz return crypt_wipe_key(cc); 2911e48d4bbfSMilan Broz } 2912542da317SMilan Broz } 2913e48d4bbfSMilan Broz 2914e48d4bbfSMilan Broz error: 2915e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 2916e48d4bbfSMilan Broz return -EINVAL; 2917e48d4bbfSMilan Broz } 2918e48d4bbfSMilan Broz 2919af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 2920af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 2921af4874e0SMike Snitzer { 2922af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 2923af4874e0SMike Snitzer 29245dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 2925af4874e0SMike Snitzer } 2926af4874e0SMike Snitzer 2927586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 2928586b286bSMike Snitzer { 2929586b286bSMike Snitzer /* 2930586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 2931586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 2932586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 2933586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 2934586b286bSMike Snitzer */ 2935586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 2936586b286bSMike Snitzer } 2937586b286bSMike Snitzer 29381da177e4SLinus Torvalds static struct target_type crypt_target = { 29391da177e4SLinus Torvalds .name = "crypt", 2940ef43aa38SMilan Broz .version = {1, 16, 0}, 29411da177e4SLinus Torvalds .module = THIS_MODULE, 29421da177e4SLinus Torvalds .ctr = crypt_ctr, 29431da177e4SLinus Torvalds .dtr = crypt_dtr, 29441da177e4SLinus Torvalds .map = crypt_map, 29451da177e4SLinus Torvalds .status = crypt_status, 2946e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 2947e48d4bbfSMilan Broz .preresume = crypt_preresume, 2948e48d4bbfSMilan Broz .resume = crypt_resume, 2949e48d4bbfSMilan Broz .message = crypt_message, 2950af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 2951586b286bSMike Snitzer .io_hints = crypt_io_hints, 29521da177e4SLinus Torvalds }; 29531da177e4SLinus Torvalds 29541da177e4SLinus Torvalds static int __init dm_crypt_init(void) 29551da177e4SLinus Torvalds { 29561da177e4SLinus Torvalds int r; 29571da177e4SLinus Torvalds 29581da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 295994f5e024SMikulas Patocka if (r < 0) 296072d94861SAlasdair G Kergon DMERR("register failed %d", r); 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds return r; 29631da177e4SLinus Torvalds } 29641da177e4SLinus Torvalds 29651da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 29661da177e4SLinus Torvalds { 296710d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 29681da177e4SLinus Torvalds } 29691da177e4SLinus Torvalds 29701da177e4SLinus Torvalds module_init(dm_crypt_init); 29711da177e4SLinus Torvalds module_exit(dm_crypt_exit); 29721da177e4SLinus Torvalds 2973bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 29741da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 29751da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2976