11da177e4SLinus Torvalds /* 2bf14299fSJana Saout * Copyright (C) 2003 Jana Saout <jana@saout.de> 31da177e4SLinus Torvalds * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> 4bbb16584SMilan Broz * Copyright (C) 2006-2020 Red Hat, Inc. All rights reserved. 5bbb16584SMilan Broz * Copyright (C) 2013-2020 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 */ 3727f5411aSDmitry Baryshkov #include <linux/key-type.h> 38c538f6ecSOndrej Kozina #include <keys/user-type.h> 3927f5411aSDmitry Baryshkov #include <keys/encrypted-type.h> 40363880c4SAhmad Fatoum #include <keys/trusted-type.h> 411da177e4SLinus Torvalds 42586e80e6SMikulas Patocka #include <linux/device-mapper.h> 431da177e4SLinus Torvalds 4472d94861SAlasdair G Kergon #define DM_MSG_PREFIX "crypt" 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds * context holding the current state of a multi-part conversion 481da177e4SLinus Torvalds */ 491da177e4SLinus Torvalds struct convert_context { 5043d69034SMilan Broz struct completion restart; 511da177e4SLinus Torvalds struct bio *bio_in; 521da177e4SLinus Torvalds struct bio *bio_out; 53003b5c57SKent Overstreet struct bvec_iter iter_in; 54003b5c57SKent Overstreet struct bvec_iter iter_out; 558d683dcdSAliOS system security u64 cc_sector; 5640b6229bSMikulas Patocka atomic_t cc_pending; 57ef43aa38SMilan Broz union { 58bbdb23b5SHerbert Xu struct skcipher_request *req; 59ef43aa38SMilan Broz struct aead_request *req_aead; 60ef43aa38SMilan Broz } r; 61ef43aa38SMilan Broz 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 6453017030SMilan Broz /* 6553017030SMilan Broz * per bio private data 6653017030SMilan Broz */ 6753017030SMilan Broz struct dm_crypt_io { 6849a8a920SAlasdair G Kergon struct crypt_config *cc; 6953017030SMilan Broz struct bio *base_bio; 70ef43aa38SMilan Broz u8 *integrity_metadata; 71ef43aa38SMilan Broz bool integrity_metadata_from_pool; 7253017030SMilan Broz struct work_struct work; 7339d42fa9SIgnat Korchagin struct tasklet_struct tasklet; 7453017030SMilan Broz 7553017030SMilan Broz struct convert_context ctx; 7653017030SMilan Broz 7740b6229bSMikulas Patocka atomic_t io_pending; 784e4cbee9SChristoph Hellwig blk_status_t error; 790c395b0fSMilan Broz sector_t sector; 80dc267621SMikulas Patocka 81b3c5fd30SMikulas Patocka struct rb_node rb_node; 82298a9fa0SMikulas Patocka } CRYPTO_MINALIGN_ATTR; 8353017030SMilan Broz 8401482b76SMilan Broz struct dm_crypt_request { 85b2174eebSHuang Ying struct convert_context *ctx; 86ef43aa38SMilan Broz struct scatterlist sg_in[4]; 87ef43aa38SMilan Broz struct scatterlist sg_out[4]; 888d683dcdSAliOS system security u64 iv_sector; 8901482b76SMilan Broz }; 9001482b76SMilan Broz 911da177e4SLinus Torvalds struct crypt_config; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds struct crypt_iv_operations { 941da177e4SLinus Torvalds int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 951da177e4SLinus Torvalds const char *opts); 961da177e4SLinus Torvalds void (*dtr)(struct crypt_config *cc); 97b95bf2d3SMilan Broz int (*init)(struct crypt_config *cc); 98542da317SMilan Broz int (*wipe)(struct crypt_config *cc); 992dc5327dSMilan Broz int (*generator)(struct crypt_config *cc, u8 *iv, 1002dc5327dSMilan Broz struct dm_crypt_request *dmreq); 1012dc5327dSMilan Broz int (*post)(struct crypt_config *cc, u8 *iv, 1022dc5327dSMilan Broz struct dm_crypt_request *dmreq); 1031da177e4SLinus Torvalds }; 1041da177e4SLinus Torvalds 10560473592SMilan Broz struct iv_benbi_private { 10660473592SMilan Broz int shift; 10760473592SMilan Broz }; 10860473592SMilan Broz 10934745785SMilan Broz #define LMK_SEED_SIZE 64 /* hash + 0 */ 11034745785SMilan Broz struct iv_lmk_private { 11134745785SMilan Broz struct crypto_shash *hash_tfm; 11234745785SMilan Broz u8 *seed; 11334745785SMilan Broz }; 11434745785SMilan Broz 115ed04d981SMilan Broz #define TCW_WHITENING_SIZE 16 116ed04d981SMilan Broz struct iv_tcw_private { 117ed04d981SMilan Broz struct crypto_shash *crc32_tfm; 118ed04d981SMilan Broz u8 *iv_seed; 119ed04d981SMilan Broz u8 *whitening; 120ed04d981SMilan Broz }; 121ed04d981SMilan Broz 122bbb16584SMilan Broz #define ELEPHANT_MAX_KEY_SIZE 32 123bbb16584SMilan Broz struct iv_elephant_private { 124bbb16584SMilan Broz struct crypto_skcipher *tfm; 125bbb16584SMilan Broz }; 126bbb16584SMilan Broz 1271da177e4SLinus Torvalds /* 1281da177e4SLinus Torvalds * Crypt: maps a linear range of a block device 1291da177e4SLinus Torvalds * and encrypts / decrypts at the same time. 1301da177e4SLinus Torvalds */ 1310f5d8e6eSMikulas Patocka enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 13239d42fa9SIgnat Korchagin DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD, 1338e225f04SDamien Le Moal DM_CRYPT_NO_READ_WORKQUEUE, DM_CRYPT_NO_WRITE_WORKQUEUE, 1348e225f04SDamien Le Moal DM_CRYPT_WRITE_INLINE }; 135c0297721SAndi Kleen 136ef43aa38SMilan Broz enum cipher_flags { 13774d1da39SGeert Uytterhoeven CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ 1388f0009a2SMilan Broz CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 139bbb16584SMilan Broz CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ 140ef43aa38SMilan Broz }; 141ef43aa38SMilan Broz 142c0297721SAndi Kleen /* 143610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 144c0297721SAndi Kleen */ 1451da177e4SLinus Torvalds struct crypt_config { 1461da177e4SLinus Torvalds struct dm_dev *dev; 1471da177e4SLinus Torvalds sector_t start; 1481da177e4SLinus Torvalds 1495059353dSMikulas Patocka struct percpu_counter n_allocated_pages; 1505059353dSMikulas Patocka 151cabf08e4SMilan Broz struct workqueue_struct *io_queue; 152cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1533f1e9070SMilan Broz 154c7329effSMikulas Patocka spinlock_t write_thread_lock; 15572d711c8SMike Snitzer struct task_struct *write_thread; 156b3c5fd30SMikulas Patocka struct rb_root write_tree; 157dc267621SMikulas Patocka 1587dbcd137SMilan Broz char *cipher_string; 159ef43aa38SMilan Broz char *cipher_auth; 160c538f6ecSOndrej Kozina char *key_string; 1615ebaee6dSMilan Broz 1621b1b58f5SJulia Lawall const struct crypt_iv_operations *iv_gen_ops; 16379066ad3SHerbert Xu union { 16460473592SMilan Broz struct iv_benbi_private benbi; 16534745785SMilan Broz struct iv_lmk_private lmk; 166ed04d981SMilan Broz struct iv_tcw_private tcw; 167bbb16584SMilan Broz struct iv_elephant_private elephant; 16879066ad3SHerbert Xu } iv_gen_private; 1698d683dcdSAliOS system security u64 iv_offset; 1701da177e4SLinus Torvalds unsigned int iv_size; 171ff3af92bSMikulas Patocka unsigned short int sector_size; 172ff3af92bSMikulas Patocka unsigned char sector_shift; 1731da177e4SLinus Torvalds 174ef43aa38SMilan Broz union { 175bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 176ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 177ef43aa38SMilan Broz } cipher_tfm; 178d1f96423SMilan Broz unsigned tfms_count; 179ef43aa38SMilan Broz unsigned long cipher_flags; 180c0297721SAndi Kleen 181c0297721SAndi Kleen /* 182ddd42edfSMilan Broz * Layout of each crypto request: 183ddd42edfSMilan Broz * 184bbdb23b5SHerbert Xu * struct skcipher_request 185ddd42edfSMilan Broz * context 186ddd42edfSMilan Broz * padding 187ddd42edfSMilan Broz * struct dm_crypt_request 188ddd42edfSMilan Broz * padding 189ddd42edfSMilan Broz * IV 190ddd42edfSMilan Broz * 191ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 192ddd42edfSMilan Broz * correctly aligned. 193ddd42edfSMilan Broz */ 194ddd42edfSMilan Broz unsigned int dmreq_start; 195ddd42edfSMilan Broz 196298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 197298a9fa0SMikulas Patocka 198e48d4bbfSMilan Broz unsigned long flags; 1991da177e4SLinus Torvalds unsigned int key_size; 200da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 201da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 202ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 203ef43aa38SMilan Broz 204ef43aa38SMilan Broz unsigned int integrity_tag_size; 205ef43aa38SMilan Broz unsigned int integrity_iv_size; 206ef43aa38SMilan Broz unsigned int on_disk_tag_size; 207ef43aa38SMilan Broz 20872d711c8SMike Snitzer /* 20972d711c8SMike Snitzer * pool for per bio private data, crypto requests, 21072d711c8SMike Snitzer * encryption requeusts/buffer pages and integrity tags 21172d711c8SMike Snitzer */ 21272d711c8SMike Snitzer unsigned tag_pool_max_sectors; 21372d711c8SMike Snitzer mempool_t tag_pool; 21472d711c8SMike Snitzer mempool_t req_pool; 21572d711c8SMike Snitzer mempool_t page_pool; 21672d711c8SMike Snitzer 21772d711c8SMike Snitzer struct bio_set bs; 21872d711c8SMike Snitzer struct mutex bio_alloc_lock; 21972d711c8SMike Snitzer 220ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 221b18ae8ddSGustavo A. R. Silva u8 key[]; 2221da177e4SLinus Torvalds }; 2231da177e4SLinus Torvalds 2240a83df6cSMikulas Patocka #define MIN_IOS 64 225ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 226ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2271da177e4SLinus Torvalds 2285059353dSMikulas Patocka static DEFINE_SPINLOCK(dm_crypt_clients_lock); 2295059353dSMikulas Patocka static unsigned dm_crypt_clients_n = 0; 2305059353dSMikulas Patocka static volatile unsigned long dm_crypt_pages_per_client; 2315059353dSMikulas Patocka #define DM_CRYPT_MEMORY_PERCENT 2 2325059353dSMikulas Patocka #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_PAGES * 16) 2335059353dSMikulas Patocka 234028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 235395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 236ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 237ef43aa38SMilan Broz struct scatterlist *sg); 238027581f3SOlaf Kirch 2393fd53533SYang Yingliang static bool crypt_integrity_aead(struct crypt_config *cc); 2403fd53533SYang Yingliang 241c0297721SAndi Kleen /* 24286f917adSEric Biggers * Use this to access cipher attributes that are independent of the key. 243c0297721SAndi Kleen */ 244bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 245c0297721SAndi Kleen { 246ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 247ef43aa38SMilan Broz } 248ef43aa38SMilan Broz 249ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 250ef43aa38SMilan Broz { 251ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 252c0297721SAndi Kleen } 253c0297721SAndi Kleen 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * Different IV generation algorithms: 2561da177e4SLinus Torvalds * 2573c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2583a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2591da177e4SLinus Torvalds * 26061afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 26161afef61SMilan Broz * number, padded with zeros if necessary. 26261afef61SMilan Broz * 2637e3fd855SMilan Broz * plain64be: the initial vector is the 64-bit big-endian version of the sector 2647e3fd855SMilan Broz * number, padded with zeros if necessary. 2657e3fd855SMilan Broz * 2663c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2671da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2681da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2691da177e4SLinus Torvalds * 27048527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 27148527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 27248527fa7SRik Snel * 27346b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 27446b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 27546b47730SLudwig Nussel * 27634745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 27734745785SMilan Broz * by the Loop-AES block device encryption system 27834745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 27934745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 28034745785SMilan Broz * with an IV derived from the sector number, the data and 28134745785SMilan Broz * optionally extra IV seed. 28234745785SMilan Broz * This means that after decryption the first block 28334745785SMilan Broz * of sector must be tweaked according to decrypted data. 28434745785SMilan Broz * Loop-AES can use three encryption schemes: 28534745785SMilan Broz * version 1: is plain aes-cbc mode 28634745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 28734745785SMilan Broz * version 3: the same as version 2 with additional IV seed 28834745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 28934745785SMilan Broz * 290ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 291ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 292e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 293ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 294ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 295ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 296ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 297ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 298ed04d981SMilan Broz * and should be used for old compatible containers access only. 299b9411d73SMilan Broz * 300b9411d73SMilan Broz * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) 301b9411d73SMilan Broz * The IV is encrypted little-endian byte-offset (with the same key 302b9411d73SMilan Broz * and cipher as the volume). 303bbb16584SMilan Broz * 304bbb16584SMilan Broz * elephant: The extended version of eboiv with additional Elephant diffuser 305bbb16584SMilan Broz * used with Bitlocker CBC mode. 306bbb16584SMilan Broz * This mode was used in older Windows systems 3076f3bc22bSAlexander A. Klimov * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf 3081da177e4SLinus Torvalds */ 3091da177e4SLinus Torvalds 3102dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 3112dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3121da177e4SLinus Torvalds { 3131da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 314283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds return 0; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 31961afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 3202dc5327dSMilan Broz struct dm_crypt_request *dmreq) 32161afef61SMilan Broz { 32261afef61SMilan Broz memset(iv, 0, cc->iv_size); 323283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 32461afef61SMilan Broz 32561afef61SMilan Broz return 0; 32661afef61SMilan Broz } 32761afef61SMilan Broz 3287e3fd855SMilan Broz static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, 3297e3fd855SMilan Broz struct dm_crypt_request *dmreq) 3307e3fd855SMilan Broz { 3317e3fd855SMilan Broz memset(iv, 0, cc->iv_size); 3327e3fd855SMilan Broz /* iv_size is at least of size u64; usually it is 16 bytes */ 3337e3fd855SMilan Broz *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); 3347e3fd855SMilan Broz 3357e3fd855SMilan Broz return 0; 3367e3fd855SMilan Broz } 3377e3fd855SMilan Broz 3382dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 3392dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3401da177e4SLinus Torvalds { 341a1a262b6SArd Biesheuvel /* 342a1a262b6SArd Biesheuvel * ESSIV encryption of the IV is now handled by the crypto API, 343a1a262b6SArd Biesheuvel * so just pass the plain sector number here. 344a1a262b6SArd Biesheuvel */ 3451da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 346283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 347c0297721SAndi Kleen 3481da177e4SLinus Torvalds return 0; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 35148527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 35248527fa7SRik Snel const char *opts) 35348527fa7SRik Snel { 3544ea9471fSMilan Broz unsigned bs; 3554ea9471fSMilan Broz int log; 3564ea9471fSMilan Broz 3573fd53533SYang Yingliang if (crypt_integrity_aead(cc)) 3584ea9471fSMilan Broz bs = crypto_aead_blocksize(any_tfm_aead(cc)); 3594ea9471fSMilan Broz else 3604ea9471fSMilan Broz bs = crypto_skcipher_blocksize(any_tfm(cc)); 3614ea9471fSMilan Broz log = ilog2(bs); 36248527fa7SRik Snel 36348527fa7SRik Snel /* we need to calculate how far we must shift the sector count 36448527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 36548527fa7SRik Snel 36648527fa7SRik Snel if (1 << log != bs) { 36748527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 36848527fa7SRik Snel return -EINVAL; 36948527fa7SRik Snel } 37048527fa7SRik Snel 37148527fa7SRik Snel if (log > 9) { 37248527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 37348527fa7SRik Snel return -EINVAL; 37448527fa7SRik Snel } 37548527fa7SRik Snel 37660473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 37748527fa7SRik Snel 37848527fa7SRik Snel return 0; 37948527fa7SRik Snel } 38048527fa7SRik Snel 38148527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 38248527fa7SRik Snel { 38348527fa7SRik Snel } 38448527fa7SRik Snel 3852dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 3862dc5327dSMilan Broz struct dm_crypt_request *dmreq) 38748527fa7SRik Snel { 38879066ad3SHerbert Xu __be64 val; 38979066ad3SHerbert Xu 39048527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 39179066ad3SHerbert Xu 3922dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 39379066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 39448527fa7SRik Snel 3951da177e4SLinus Torvalds return 0; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3982dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 3992dc5327dSMilan Broz struct dm_crypt_request *dmreq) 40046b47730SLudwig Nussel { 40146b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 40246b47730SLudwig Nussel 40346b47730SLudwig Nussel return 0; 40446b47730SLudwig Nussel } 40546b47730SLudwig Nussel 40634745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 40734745785SMilan Broz { 40834745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 40934745785SMilan Broz 41034745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 41134745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 41234745785SMilan Broz lmk->hash_tfm = NULL; 41334745785SMilan Broz 414453431a5SWaiman Long kfree_sensitive(lmk->seed); 41534745785SMilan Broz lmk->seed = NULL; 41634745785SMilan Broz } 41734745785SMilan Broz 41834745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 41934745785SMilan Broz const char *opts) 42034745785SMilan Broz { 42134745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 42234745785SMilan Broz 4238f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 4248f0009a2SMilan Broz ti->error = "Unsupported sector size for LMK"; 4258f0009a2SMilan Broz return -EINVAL; 4268f0009a2SMilan Broz } 4278f0009a2SMilan Broz 428cd746938SMikulas Patocka lmk->hash_tfm = crypto_alloc_shash("md5", 0, 429cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 43034745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 43134745785SMilan Broz ti->error = "Error initializing LMK hash"; 43234745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 43334745785SMilan Broz } 43434745785SMilan Broz 43534745785SMilan Broz /* No seed in LMK version 2 */ 43634745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 43734745785SMilan Broz lmk->seed = NULL; 43834745785SMilan Broz return 0; 43934745785SMilan Broz } 44034745785SMilan Broz 44134745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 44234745785SMilan Broz if (!lmk->seed) { 44334745785SMilan Broz crypt_iv_lmk_dtr(cc); 44434745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 44534745785SMilan Broz return -ENOMEM; 44634745785SMilan Broz } 44734745785SMilan Broz 44834745785SMilan Broz return 0; 44934745785SMilan Broz } 45034745785SMilan Broz 45134745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 45234745785SMilan Broz { 45334745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 45434745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 45534745785SMilan Broz 45634745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 45734745785SMilan Broz if (lmk->seed) 45834745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 45934745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 46034745785SMilan Broz 46134745785SMilan Broz return 0; 46234745785SMilan Broz } 46334745785SMilan Broz 46434745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 46534745785SMilan Broz { 46634745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 46734745785SMilan Broz 46834745785SMilan Broz if (lmk->seed) 46934745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 47034745785SMilan Broz 47134745785SMilan Broz return 0; 47234745785SMilan Broz } 47334745785SMilan Broz 47434745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 47534745785SMilan Broz struct dm_crypt_request *dmreq, 47634745785SMilan Broz u8 *data) 47734745785SMilan Broz { 47834745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 479b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 48034745785SMilan Broz struct md5_state md5state; 481da31a078SMilan Broz __le32 buf[4]; 48234745785SMilan Broz int i, r; 48334745785SMilan Broz 484b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 48534745785SMilan Broz 486b6106265SJan-Simon Möller r = crypto_shash_init(desc); 48734745785SMilan Broz if (r) 48834745785SMilan Broz return r; 48934745785SMilan Broz 49034745785SMilan Broz if (lmk->seed) { 491b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 49234745785SMilan Broz if (r) 49334745785SMilan Broz return r; 49434745785SMilan Broz } 49534745785SMilan Broz 49634745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 497b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 49834745785SMilan Broz if (r) 49934745785SMilan Broz return r; 50034745785SMilan Broz 50134745785SMilan Broz /* Sector is cropped to 56 bits here */ 50234745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 50334745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 50434745785SMilan Broz buf[2] = cpu_to_le32(4024); 50534745785SMilan Broz buf[3] = 0; 506b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 50734745785SMilan Broz if (r) 50834745785SMilan Broz return r; 50934745785SMilan Broz 51034745785SMilan Broz /* No MD5 padding here */ 511b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 51234745785SMilan Broz if (r) 51334745785SMilan Broz return r; 51434745785SMilan Broz 51534745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 51634745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 51734745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 51834745785SMilan Broz 51934745785SMilan Broz return 0; 52034745785SMilan Broz } 52134745785SMilan Broz 52234745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 52334745785SMilan Broz struct dm_crypt_request *dmreq) 52434745785SMilan Broz { 525ef43aa38SMilan Broz struct scatterlist *sg; 52634745785SMilan Broz u8 *src; 52734745785SMilan Broz int r = 0; 52834745785SMilan Broz 52934745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 530ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 531ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 532ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 533c2e022cbSCong Wang kunmap_atomic(src); 53434745785SMilan Broz } else 53534745785SMilan Broz memset(iv, 0, cc->iv_size); 53634745785SMilan Broz 53734745785SMilan Broz return r; 53834745785SMilan Broz } 53934745785SMilan Broz 54034745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 54134745785SMilan Broz struct dm_crypt_request *dmreq) 54234745785SMilan Broz { 543ef43aa38SMilan Broz struct scatterlist *sg; 54434745785SMilan Broz u8 *dst; 54534745785SMilan Broz int r; 54634745785SMilan Broz 54734745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 54834745785SMilan Broz return 0; 54934745785SMilan Broz 550ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 551ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 552ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 55334745785SMilan Broz 55434745785SMilan Broz /* Tweak the first block of plaintext sector */ 55534745785SMilan Broz if (!r) 556ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 55734745785SMilan Broz 558c2e022cbSCong Wang kunmap_atomic(dst); 55934745785SMilan Broz return r; 56034745785SMilan Broz } 56134745785SMilan Broz 562ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 563ed04d981SMilan Broz { 564ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 565ed04d981SMilan Broz 566453431a5SWaiman Long kfree_sensitive(tcw->iv_seed); 567ed04d981SMilan Broz tcw->iv_seed = NULL; 568453431a5SWaiman Long kfree_sensitive(tcw->whitening); 569ed04d981SMilan Broz tcw->whitening = NULL; 570ed04d981SMilan Broz 571ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 572ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 573ed04d981SMilan Broz tcw->crc32_tfm = NULL; 574ed04d981SMilan Broz } 575ed04d981SMilan Broz 576ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 577ed04d981SMilan Broz const char *opts) 578ed04d981SMilan Broz { 579ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 580ed04d981SMilan Broz 5818f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 5828f0009a2SMilan Broz ti->error = "Unsupported sector size for TCW"; 5838f0009a2SMilan Broz return -EINVAL; 5848f0009a2SMilan Broz } 5858f0009a2SMilan Broz 586ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 587ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 588ed04d981SMilan Broz return -EINVAL; 589ed04d981SMilan Broz } 590ed04d981SMilan Broz 591cd746938SMikulas Patocka tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 592cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 593ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 594ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 595ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 596ed04d981SMilan Broz } 597ed04d981SMilan Broz 598ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 599ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 600ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 601ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 602ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 603ed04d981SMilan Broz return -ENOMEM; 604ed04d981SMilan Broz } 605ed04d981SMilan Broz 606ed04d981SMilan Broz return 0; 607ed04d981SMilan Broz } 608ed04d981SMilan Broz 609ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 610ed04d981SMilan Broz { 611ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 612ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 613ed04d981SMilan Broz 614ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 615ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 616ed04d981SMilan Broz TCW_WHITENING_SIZE); 617ed04d981SMilan Broz 618ed04d981SMilan Broz return 0; 619ed04d981SMilan Broz } 620ed04d981SMilan Broz 621ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 622ed04d981SMilan Broz { 623ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 624ed04d981SMilan Broz 625ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 626ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 627ed04d981SMilan Broz 628ed04d981SMilan Broz return 0; 629ed04d981SMilan Broz } 630ed04d981SMilan Broz 631ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 632ed04d981SMilan Broz struct dm_crypt_request *dmreq, 633ed04d981SMilan Broz u8 *data) 634ed04d981SMilan Broz { 635ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 636350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 637ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 638b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 639ed04d981SMilan Broz int i, r; 640ed04d981SMilan Broz 641ed04d981SMilan Broz /* xor whitening with sector number */ 64245fe93dfSArd Biesheuvel crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); 64345fe93dfSArd Biesheuvel crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); 644ed04d981SMilan Broz 645ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 646b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 647ed04d981SMilan Broz for (i = 0; i < 4; i++) { 648b6106265SJan-Simon Möller r = crypto_shash_init(desc); 649ed04d981SMilan Broz if (r) 650ed04d981SMilan Broz goto out; 651b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 652ed04d981SMilan Broz if (r) 653ed04d981SMilan Broz goto out; 654b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 655ed04d981SMilan Broz if (r) 656ed04d981SMilan Broz goto out; 657ed04d981SMilan Broz } 658ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 659ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 660ed04d981SMilan Broz 661ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 662ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 663ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 664ed04d981SMilan Broz out: 6651a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 666ed04d981SMilan Broz return r; 667ed04d981SMilan Broz } 668ed04d981SMilan Broz 669ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 670ed04d981SMilan Broz struct dm_crypt_request *dmreq) 671ed04d981SMilan Broz { 672ef43aa38SMilan Broz struct scatterlist *sg; 673ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 674350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 675ed04d981SMilan Broz u8 *src; 676ed04d981SMilan Broz int r = 0; 677ed04d981SMilan Broz 678ed04d981SMilan Broz /* Remove whitening from ciphertext */ 679ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 680ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 681ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 682ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 683ed04d981SMilan Broz kunmap_atomic(src); 684ed04d981SMilan Broz } 685ed04d981SMilan Broz 686ed04d981SMilan Broz /* Calculate IV */ 68745fe93dfSArd Biesheuvel crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); 688ed04d981SMilan Broz if (cc->iv_size > 8) 68945fe93dfSArd Biesheuvel crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, 69045fe93dfSArd Biesheuvel cc->iv_size - 8); 691ed04d981SMilan Broz 692ed04d981SMilan Broz return r; 693ed04d981SMilan Broz } 694ed04d981SMilan Broz 695ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 696ed04d981SMilan Broz struct dm_crypt_request *dmreq) 697ed04d981SMilan Broz { 698ef43aa38SMilan Broz struct scatterlist *sg; 699ed04d981SMilan Broz u8 *dst; 700ed04d981SMilan Broz int r; 701ed04d981SMilan Broz 702ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 703ed04d981SMilan Broz return 0; 704ed04d981SMilan Broz 705ed04d981SMilan Broz /* Apply whitening on ciphertext */ 706ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 707ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 708ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 709ed04d981SMilan Broz kunmap_atomic(dst); 710ed04d981SMilan Broz 711ed04d981SMilan Broz return r; 712ed04d981SMilan Broz } 713ed04d981SMilan Broz 714ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 715ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 716ef43aa38SMilan Broz { 717ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 718ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 719ef43aa38SMilan Broz return 0; 720ef43aa38SMilan Broz } 721ef43aa38SMilan Broz 722b9411d73SMilan Broz static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, 723b9411d73SMilan Broz const char *opts) 724b9411d73SMilan Broz { 7253fd53533SYang Yingliang if (crypt_integrity_aead(cc)) { 72639d13a1aSArd Biesheuvel ti->error = "AEAD transforms not supported for EBOIV"; 727b9411d73SMilan Broz return -EINVAL; 728b9411d73SMilan Broz } 729b9411d73SMilan Broz 73039d13a1aSArd Biesheuvel if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { 73139d13a1aSArd Biesheuvel ti->error = "Block size of EBOIV cipher does " 73239d13a1aSArd Biesheuvel "not match IV size of block cipher"; 73339d13a1aSArd Biesheuvel return -EINVAL; 734b9411d73SMilan Broz } 735b9411d73SMilan Broz 736b9411d73SMilan Broz return 0; 737b9411d73SMilan Broz } 738b9411d73SMilan Broz 739b9411d73SMilan Broz static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, 740b9411d73SMilan Broz struct dm_crypt_request *dmreq) 741b9411d73SMilan Broz { 74239d13a1aSArd Biesheuvel u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64)); 74339d13a1aSArd Biesheuvel struct skcipher_request *req; 74439d13a1aSArd Biesheuvel struct scatterlist src, dst; 7457785a9e4SDamien Le Moal DECLARE_CRYPTO_WAIT(wait); 74639d13a1aSArd Biesheuvel int err; 747b9411d73SMilan Broz 7489402e959SMikulas Patocka req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO); 74939d13a1aSArd Biesheuvel if (!req) 75039d13a1aSArd Biesheuvel return -ENOMEM; 751b9411d73SMilan Broz 75239d13a1aSArd Biesheuvel memset(buf, 0, cc->iv_size); 75339d13a1aSArd Biesheuvel *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 75439d13a1aSArd Biesheuvel 75539d13a1aSArd Biesheuvel sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); 75639d13a1aSArd Biesheuvel sg_init_one(&dst, iv, cc->iv_size); 75739d13a1aSArd Biesheuvel skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); 75839d13a1aSArd Biesheuvel skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 75939d13a1aSArd Biesheuvel err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 76039d13a1aSArd Biesheuvel skcipher_request_free(req); 76139d13a1aSArd Biesheuvel 76239d13a1aSArd Biesheuvel return err; 763b9411d73SMilan Broz } 764b9411d73SMilan Broz 765bbb16584SMilan Broz static void crypt_iv_elephant_dtr(struct crypt_config *cc) 766bbb16584SMilan Broz { 767bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 768bbb16584SMilan Broz 769bbb16584SMilan Broz crypto_free_skcipher(elephant->tfm); 770bbb16584SMilan Broz elephant->tfm = NULL; 771bbb16584SMilan Broz } 772bbb16584SMilan Broz 773bbb16584SMilan Broz static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, 774bbb16584SMilan Broz const char *opts) 775bbb16584SMilan Broz { 776bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 777bbb16584SMilan Broz int r; 778bbb16584SMilan Broz 779cd746938SMikulas Patocka elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 780cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 781bbb16584SMilan Broz if (IS_ERR(elephant->tfm)) { 782bbb16584SMilan Broz r = PTR_ERR(elephant->tfm); 783bbb16584SMilan Broz elephant->tfm = NULL; 784bbb16584SMilan Broz return r; 785bbb16584SMilan Broz } 786bbb16584SMilan Broz 787bbb16584SMilan Broz r = crypt_iv_eboiv_ctr(cc, ti, NULL); 788bbb16584SMilan Broz if (r) 789bbb16584SMilan Broz crypt_iv_elephant_dtr(cc); 790bbb16584SMilan Broz return r; 791bbb16584SMilan Broz } 792bbb16584SMilan Broz 793bbb16584SMilan Broz static void diffuser_disk_to_cpu(u32 *d, size_t n) 794bbb16584SMilan Broz { 795bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 796bbb16584SMilan Broz int i; 797bbb16584SMilan Broz 798bbb16584SMilan Broz for (i = 0; i < n; i++) 799bbb16584SMilan Broz d[i] = le32_to_cpu((__le32)d[i]); 800bbb16584SMilan Broz #endif 801bbb16584SMilan Broz } 802bbb16584SMilan Broz 803bbb16584SMilan Broz static void diffuser_cpu_to_disk(__le32 *d, size_t n) 804bbb16584SMilan Broz { 805bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 806bbb16584SMilan Broz int i; 807bbb16584SMilan Broz 808bbb16584SMilan Broz for (i = 0; i < n; i++) 809bbb16584SMilan Broz d[i] = cpu_to_le32((u32)d[i]); 810bbb16584SMilan Broz #endif 811bbb16584SMilan Broz } 812bbb16584SMilan Broz 813bbb16584SMilan Broz static void diffuser_a_decrypt(u32 *d, size_t n) 814bbb16584SMilan Broz { 815bbb16584SMilan Broz int i, i1, i2, i3; 816bbb16584SMilan Broz 817bbb16584SMilan Broz for (i = 0; i < 5; i++) { 818bbb16584SMilan Broz i1 = 0; 819bbb16584SMilan Broz i2 = n - 2; 820bbb16584SMilan Broz i3 = n - 5; 821bbb16584SMilan Broz 822bbb16584SMilan Broz while (i1 < (n - 1)) { 823bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 824bbb16584SMilan Broz i1++; i2++; i3++; 825bbb16584SMilan Broz 826bbb16584SMilan Broz if (i3 >= n) 827bbb16584SMilan Broz i3 -= n; 828bbb16584SMilan Broz 829bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 830bbb16584SMilan Broz i1++; i2++; i3++; 831bbb16584SMilan Broz 832bbb16584SMilan Broz if (i2 >= n) 833bbb16584SMilan Broz i2 -= n; 834bbb16584SMilan Broz 835bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 836bbb16584SMilan Broz i1++; i2++; i3++; 837bbb16584SMilan Broz 838bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 839bbb16584SMilan Broz i1++; i2++; i3++; 840bbb16584SMilan Broz } 841bbb16584SMilan Broz } 842bbb16584SMilan Broz } 843bbb16584SMilan Broz 844bbb16584SMilan Broz static void diffuser_a_encrypt(u32 *d, size_t n) 845bbb16584SMilan Broz { 846bbb16584SMilan Broz int i, i1, i2, i3; 847bbb16584SMilan Broz 848bbb16584SMilan Broz for (i = 0; i < 5; i++) { 849bbb16584SMilan Broz i1 = n - 1; 850bbb16584SMilan Broz i2 = n - 2 - 1; 851bbb16584SMilan Broz i3 = n - 5 - 1; 852bbb16584SMilan Broz 853bbb16584SMilan Broz while (i1 > 0) { 854bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 855bbb16584SMilan Broz i1--; i2--; i3--; 856bbb16584SMilan Broz 857bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 858bbb16584SMilan Broz i1--; i2--; i3--; 859bbb16584SMilan Broz 860bbb16584SMilan Broz if (i2 < 0) 861bbb16584SMilan Broz i2 += n; 862bbb16584SMilan Broz 863bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 864bbb16584SMilan Broz i1--; i2--; i3--; 865bbb16584SMilan Broz 866bbb16584SMilan Broz if (i3 < 0) 867bbb16584SMilan Broz i3 += n; 868bbb16584SMilan Broz 869bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 870bbb16584SMilan Broz i1--; i2--; i3--; 871bbb16584SMilan Broz } 872bbb16584SMilan Broz } 873bbb16584SMilan Broz } 874bbb16584SMilan Broz 875bbb16584SMilan Broz static void diffuser_b_decrypt(u32 *d, size_t n) 876bbb16584SMilan Broz { 877bbb16584SMilan Broz int i, i1, i2, i3; 878bbb16584SMilan Broz 879bbb16584SMilan Broz for (i = 0; i < 3; i++) { 880bbb16584SMilan Broz i1 = 0; 881bbb16584SMilan Broz i2 = 2; 882bbb16584SMilan Broz i3 = 5; 883bbb16584SMilan Broz 884bbb16584SMilan Broz while (i1 < (n - 1)) { 885bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 886bbb16584SMilan Broz i1++; i2++; i3++; 887bbb16584SMilan Broz 888bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 889bbb16584SMilan Broz i1++; i2++; i3++; 890bbb16584SMilan Broz 891bbb16584SMilan Broz if (i2 >= n) 892bbb16584SMilan Broz i2 -= n; 893bbb16584SMilan Broz 894bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 895bbb16584SMilan Broz i1++; i2++; i3++; 896bbb16584SMilan Broz 897bbb16584SMilan Broz if (i3 >= n) 898bbb16584SMilan Broz i3 -= n; 899bbb16584SMilan Broz 900bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 901bbb16584SMilan Broz i1++; i2++; i3++; 902bbb16584SMilan Broz } 903bbb16584SMilan Broz } 904bbb16584SMilan Broz } 905bbb16584SMilan Broz 906bbb16584SMilan Broz static void diffuser_b_encrypt(u32 *d, size_t n) 907bbb16584SMilan Broz { 908bbb16584SMilan Broz int i, i1, i2, i3; 909bbb16584SMilan Broz 910bbb16584SMilan Broz for (i = 0; i < 3; i++) { 911bbb16584SMilan Broz i1 = n - 1; 912bbb16584SMilan Broz i2 = 2 - 1; 913bbb16584SMilan Broz i3 = 5 - 1; 914bbb16584SMilan Broz 915bbb16584SMilan Broz while (i1 > 0) { 916bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 917bbb16584SMilan Broz i1--; i2--; i3--; 918bbb16584SMilan Broz 919bbb16584SMilan Broz if (i3 < 0) 920bbb16584SMilan Broz i3 += n; 921bbb16584SMilan Broz 922bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 923bbb16584SMilan Broz i1--; i2--; i3--; 924bbb16584SMilan Broz 925bbb16584SMilan Broz if (i2 < 0) 926bbb16584SMilan Broz i2 += n; 927bbb16584SMilan Broz 928bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 929bbb16584SMilan Broz i1--; i2--; i3--; 930bbb16584SMilan Broz 931bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 932bbb16584SMilan Broz i1--; i2--; i3--; 933bbb16584SMilan Broz } 934bbb16584SMilan Broz } 935bbb16584SMilan Broz } 936bbb16584SMilan Broz 937bbb16584SMilan Broz static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq) 938bbb16584SMilan Broz { 939bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 940bbb16584SMilan Broz u8 *es, *ks, *data, *data2, *data_offset; 941bbb16584SMilan Broz struct skcipher_request *req; 942bbb16584SMilan Broz struct scatterlist *sg, *sg2, src, dst; 9437785a9e4SDamien Le Moal DECLARE_CRYPTO_WAIT(wait); 944bbb16584SMilan Broz int i, r; 945bbb16584SMilan Broz 946bbb16584SMilan Broz req = skcipher_request_alloc(elephant->tfm, GFP_NOIO); 947bbb16584SMilan Broz es = kzalloc(16, GFP_NOIO); /* Key for AES */ 948bbb16584SMilan Broz ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */ 949bbb16584SMilan Broz 950bbb16584SMilan Broz if (!req || !es || !ks) { 951bbb16584SMilan Broz r = -ENOMEM; 952bbb16584SMilan Broz goto out; 953bbb16584SMilan Broz } 954bbb16584SMilan Broz 955bbb16584SMilan Broz *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 956bbb16584SMilan Broz 957bbb16584SMilan Broz /* E(Ks, e(s)) */ 958bbb16584SMilan Broz sg_init_one(&src, es, 16); 959bbb16584SMilan Broz sg_init_one(&dst, ks, 16); 960bbb16584SMilan Broz skcipher_request_set_crypt(req, &src, &dst, 16, NULL); 961bbb16584SMilan Broz skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 962bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 963bbb16584SMilan Broz if (r) 964bbb16584SMilan Broz goto out; 965bbb16584SMilan Broz 966bbb16584SMilan Broz /* E(Ks, e'(s)) */ 967bbb16584SMilan Broz es[15] = 0x80; 968bbb16584SMilan Broz sg_init_one(&dst, &ks[16], 16); 969bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 970bbb16584SMilan Broz if (r) 971bbb16584SMilan Broz goto out; 972bbb16584SMilan Broz 973bbb16584SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 974bbb16584SMilan Broz data = kmap_atomic(sg_page(sg)); 975bbb16584SMilan Broz data_offset = data + sg->offset; 976bbb16584SMilan Broz 977bbb16584SMilan Broz /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ 978bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 979bbb16584SMilan Broz sg2 = crypt_get_sg_data(cc, dmreq->sg_in); 980bbb16584SMilan Broz data2 = kmap_atomic(sg_page(sg2)); 981bbb16584SMilan Broz memcpy(data_offset, data2 + sg2->offset, cc->sector_size); 982bbb16584SMilan Broz kunmap_atomic(data2); 983bbb16584SMilan Broz } 984bbb16584SMilan Broz 985bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 986bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 987bbb16584SMilan Broz diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 988bbb16584SMilan Broz diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 989bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 990bbb16584SMilan Broz } 991bbb16584SMilan Broz 992bbb16584SMilan Broz for (i = 0; i < (cc->sector_size / 32); i++) 993bbb16584SMilan Broz crypto_xor(data_offset + i * 32, ks, 32); 994bbb16584SMilan Broz 995bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 996bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 997bbb16584SMilan Broz diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 998bbb16584SMilan Broz diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 999bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 1000bbb16584SMilan Broz } 1001bbb16584SMilan Broz 1002bbb16584SMilan Broz kunmap_atomic(data); 1003bbb16584SMilan Broz out: 1004453431a5SWaiman Long kfree_sensitive(ks); 1005453431a5SWaiman Long kfree_sensitive(es); 1006bbb16584SMilan Broz skcipher_request_free(req); 1007bbb16584SMilan Broz return r; 1008bbb16584SMilan Broz } 1009bbb16584SMilan Broz 1010bbb16584SMilan Broz static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, 1011bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1012bbb16584SMilan Broz { 1013bbb16584SMilan Broz int r; 1014bbb16584SMilan Broz 1015bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 1016bbb16584SMilan Broz r = crypt_iv_elephant(cc, dmreq); 1017bbb16584SMilan Broz if (r) 1018bbb16584SMilan Broz return r; 1019bbb16584SMilan Broz } 1020bbb16584SMilan Broz 1021bbb16584SMilan Broz return crypt_iv_eboiv_gen(cc, iv, dmreq); 1022bbb16584SMilan Broz } 1023bbb16584SMilan Broz 1024bbb16584SMilan Broz static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, 1025bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1026bbb16584SMilan Broz { 1027bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 1028bbb16584SMilan Broz return crypt_iv_elephant(cc, dmreq); 1029bbb16584SMilan Broz 1030bbb16584SMilan Broz return 0; 1031bbb16584SMilan Broz } 1032bbb16584SMilan Broz 1033bbb16584SMilan Broz static int crypt_iv_elephant_init(struct crypt_config *cc) 1034bbb16584SMilan Broz { 1035bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1036bbb16584SMilan Broz int key_offset = cc->key_size - cc->key_extra_size; 1037bbb16584SMilan Broz 1038bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size); 1039bbb16584SMilan Broz } 1040bbb16584SMilan Broz 1041bbb16584SMilan Broz static int crypt_iv_elephant_wipe(struct crypt_config *cc) 1042bbb16584SMilan Broz { 1043bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1044bbb16584SMilan Broz u8 key[ELEPHANT_MAX_KEY_SIZE]; 1045bbb16584SMilan Broz 1046bbb16584SMilan Broz memset(key, 0, cc->key_extra_size); 1047bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size); 1048bbb16584SMilan Broz } 1049bbb16584SMilan Broz 10501b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 10511da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 10521da177e4SLinus Torvalds }; 10531da177e4SLinus Torvalds 10541b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 105561afef61SMilan Broz .generator = crypt_iv_plain64_gen 105661afef61SMilan Broz }; 105761afef61SMilan Broz 10587e3fd855SMilan Broz static const struct crypt_iv_operations crypt_iv_plain64be_ops = { 10597e3fd855SMilan Broz .generator = crypt_iv_plain64be_gen 10607e3fd855SMilan Broz }; 10617e3fd855SMilan Broz 10621b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 10631da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 10641da177e4SLinus Torvalds }; 10651da177e4SLinus Torvalds 10661b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 106748527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 106848527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 106948527fa7SRik Snel .generator = crypt_iv_benbi_gen 107048527fa7SRik Snel }; 10711da177e4SLinus Torvalds 10721b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 107346b47730SLudwig Nussel .generator = crypt_iv_null_gen 107446b47730SLudwig Nussel }; 107546b47730SLudwig Nussel 10761b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 107734745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 107834745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 107934745785SMilan Broz .init = crypt_iv_lmk_init, 108034745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 108134745785SMilan Broz .generator = crypt_iv_lmk_gen, 108234745785SMilan Broz .post = crypt_iv_lmk_post 108334745785SMilan Broz }; 108434745785SMilan Broz 10851b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 1086ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 1087ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 1088ed04d981SMilan Broz .init = crypt_iv_tcw_init, 1089ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 1090ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 1091ed04d981SMilan Broz .post = crypt_iv_tcw_post 1092ed04d981SMilan Broz }; 1093ed04d981SMilan Broz 1094e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_random_ops = { 1095ef43aa38SMilan Broz .generator = crypt_iv_random_gen 1096ef43aa38SMilan Broz }; 1097ef43aa38SMilan Broz 1098e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_eboiv_ops = { 1099b9411d73SMilan Broz .ctr = crypt_iv_eboiv_ctr, 1100b9411d73SMilan Broz .generator = crypt_iv_eboiv_gen 1101b9411d73SMilan Broz }; 1102b9411d73SMilan Broz 1103e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_elephant_ops = { 1104bbb16584SMilan Broz .ctr = crypt_iv_elephant_ctr, 1105bbb16584SMilan Broz .dtr = crypt_iv_elephant_dtr, 1106bbb16584SMilan Broz .init = crypt_iv_elephant_init, 1107bbb16584SMilan Broz .wipe = crypt_iv_elephant_wipe, 1108bbb16584SMilan Broz .generator = crypt_iv_elephant_gen, 1109bbb16584SMilan Broz .post = crypt_iv_elephant_post 1110bbb16584SMilan Broz }; 1111bbb16584SMilan Broz 1112ef43aa38SMilan Broz /* 1113ef43aa38SMilan Broz * Integrity extensions 1114ef43aa38SMilan Broz */ 1115ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 1116ef43aa38SMilan Broz { 1117ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 1118ef43aa38SMilan Broz } 1119ef43aa38SMilan Broz 1120ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 1121ef43aa38SMilan Broz { 112233d2f09fSMilan Broz return crypt_integrity_aead(cc) && cc->key_mac_size; 1123ef43aa38SMilan Broz } 1124ef43aa38SMilan Broz 1125ef43aa38SMilan Broz /* Get sg containing data */ 1126ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 1127ef43aa38SMilan Broz struct scatterlist *sg) 1128ef43aa38SMilan Broz { 112933d2f09fSMilan Broz if (unlikely(crypt_integrity_aead(cc))) 1130ef43aa38SMilan Broz return &sg[2]; 1131ef43aa38SMilan Broz 1132ef43aa38SMilan Broz return sg; 1133ef43aa38SMilan Broz } 1134ef43aa38SMilan Broz 1135ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 1136ef43aa38SMilan Broz { 1137ef43aa38SMilan Broz struct bio_integrity_payload *bip; 1138ef43aa38SMilan Broz unsigned int tag_len; 1139ef43aa38SMilan Broz int ret; 1140ef43aa38SMilan Broz 1141ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 1142ef43aa38SMilan Broz return 0; 1143ef43aa38SMilan Broz 1144ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 1145ef43aa38SMilan Broz if (IS_ERR(bip)) 1146ef43aa38SMilan Broz return PTR_ERR(bip); 1147ef43aa38SMilan Broz 1148ff0c129dSMikulas Patocka tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); 1149ef43aa38SMilan Broz 1150ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 1151ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 1152ef43aa38SMilan Broz 1153ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 1154ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 1155ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 1156ef43aa38SMilan Broz return -ENOMEM; 1157ef43aa38SMilan Broz 1158ef43aa38SMilan Broz return 0; 1159ef43aa38SMilan Broz } 1160ef43aa38SMilan Broz 1161ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 1162ef43aa38SMilan Broz { 1163ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 1164ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 11657a1cd723SMilan Broz struct mapped_device *md = dm_table_get_md(ti->table); 1166ef43aa38SMilan Broz 1167ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 1168ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 1169ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1170ef43aa38SMilan Broz return -EINVAL; 1171ef43aa38SMilan Broz } 1172ef43aa38SMilan Broz 1173583fe747SMikulas Patocka if (bi->tag_size != cc->on_disk_tag_size || 1174583fe747SMikulas Patocka bi->tuple_size != cc->on_disk_tag_size) { 1175ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 1176ef43aa38SMilan Broz return -EINVAL; 1177ef43aa38SMilan Broz } 1178583fe747SMikulas Patocka if (1 << bi->interval_exp != cc->sector_size) { 1179583fe747SMikulas Patocka ti->error = "Integrity profile sector size mismatch."; 1180583fe747SMikulas Patocka return -EINVAL; 1181583fe747SMikulas Patocka } 1182ef43aa38SMilan Broz 118333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 1184ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 11857a1cd723SMilan Broz DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), 1186ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 1187ef43aa38SMilan Broz 1188ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 1189ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 1190ef43aa38SMilan Broz return -EINVAL; 1191ef43aa38SMilan Broz } 1192ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 11937a1cd723SMilan Broz DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), 1194ef43aa38SMilan Broz cc->integrity_iv_size); 1195ef43aa38SMilan Broz 1196ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 1197ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 1198ef43aa38SMilan Broz return -EINVAL; 1199ef43aa38SMilan Broz } 1200ef43aa38SMilan Broz 1201ef43aa38SMilan Broz return 0; 1202ef43aa38SMilan Broz #else 1203ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1204ef43aa38SMilan Broz return -EINVAL; 1205ef43aa38SMilan Broz #endif 1206ef43aa38SMilan Broz } 1207ef43aa38SMilan Broz 1208d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 1209d469f841SMilan Broz struct convert_context *ctx, 12101da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 1211fcd369daSMilan Broz sector_t sector) 12121da177e4SLinus Torvalds { 12131da177e4SLinus Torvalds ctx->bio_in = bio_in; 12141da177e4SLinus Torvalds ctx->bio_out = bio_out; 1215003b5c57SKent Overstreet if (bio_in) 1216003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 1217003b5c57SKent Overstreet if (bio_out) 1218003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 1219c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 122043d69034SMilan Broz init_completion(&ctx->restart); 12211da177e4SLinus Torvalds } 12221da177e4SLinus Torvalds 1223b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 1224ef43aa38SMilan Broz void *req) 1225b2174eebSHuang Ying { 1226b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 1227b2174eebSHuang Ying } 1228b2174eebSHuang Ying 1229ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 1230b2174eebSHuang Ying { 1231ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 1232b2174eebSHuang Ying } 1233b2174eebSHuang Ying 12342dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 12352dc5327dSMilan Broz struct dm_crypt_request *dmreq) 12362dc5327dSMilan Broz { 123733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1238ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1239ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1240ef43aa38SMilan Broz else 12412dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1242bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 12432dc5327dSMilan Broz } 12442dc5327dSMilan Broz 1245ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1246ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1247ef43aa38SMilan Broz { 1248ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1249ef43aa38SMilan Broz } 1250ef43aa38SMilan Broz 1251c13b5487SChristoph Hellwig static __le64 *org_sector_of_dmreq(struct crypt_config *cc, 1252ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1253ef43aa38SMilan Broz { 1254ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1255c13b5487SChristoph Hellwig return (__le64 *) ptr; 1256ef43aa38SMilan Broz } 1257ef43aa38SMilan Broz 1258ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1259ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1260ef43aa38SMilan Broz { 1261ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1262ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1263ef43aa38SMilan Broz return (unsigned int*)ptr; 1264ef43aa38SMilan Broz } 1265ef43aa38SMilan Broz 1266ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1267ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1268ef43aa38SMilan Broz { 1269ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1270ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1271ef43aa38SMilan Broz 1272ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1273ef43aa38SMilan Broz cc->on_disk_tag_size]; 1274ef43aa38SMilan Broz } 1275ef43aa38SMilan Broz 1276ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1277ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1278ef43aa38SMilan Broz { 1279ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1280ef43aa38SMilan Broz } 1281ef43aa38SMilan Broz 1282ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 12833a7f6c99SMilan Broz struct convert_context *ctx, 1284ef43aa38SMilan Broz struct aead_request *req, 1285ef43aa38SMilan Broz unsigned int tag_offset) 128601482b76SMilan Broz { 1287003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1288003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 12893a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1290ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1291c13b5487SChristoph Hellwig __le64 *sector; 1292ef43aa38SMilan Broz int r = 0; 1293ef43aa38SMilan Broz 1294ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 129501482b76SMilan Broz 12968f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 12970440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 12988f0009a2SMilan Broz return -EIO; 129901482b76SMilan Broz 1300b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1301c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 13028f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1303ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1304b2174eebSHuang Ying dmreq->ctx = ctx; 130501482b76SMilan Broz 1306ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 130701482b76SMilan Broz 1308ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1309ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1310ef43aa38SMilan Broz 1311ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1312ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1313ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1314ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1315ef43aa38SMilan Broz 1316ef43aa38SMilan Broz /* AEAD request: 1317ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1318ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1319ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1320ef43aa38SMilan Broz */ 1321ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1322ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1323ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 13248f0009a2SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1325ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1326ef43aa38SMilan Broz 1327ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1328ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1329ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 13308f0009a2SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1331ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 133201482b76SMilan Broz 13333a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1334ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1335ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1336ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1337ef43aa38SMilan Broz } else { 1338ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 13393a7f6c99SMilan Broz if (r < 0) 13403a7f6c99SMilan Broz return r; 1341ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1342ef43aa38SMilan Broz if (cc->integrity_iv_size) 1343ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1344ef43aa38SMilan Broz } 1345ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1346ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1347ef43aa38SMilan Broz } 1348ef43aa38SMilan Broz 1349ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1350ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1351ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13528f0009a2SMilan Broz cc->sector_size, iv); 1353ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1354ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1355ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1356ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1357ef43aa38SMilan Broz } else { 1358ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13598f0009a2SMilan Broz cc->sector_size + cc->integrity_tag_size, iv); 1360ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1361ef43aa38SMilan Broz } 1362ef43aa38SMilan Broz 1363f710126cSMilan Broz if (r == -EBADMSG) { 1364f710126cSMilan Broz char b[BDEVNAME_SIZE]; 1365f710126cSMilan Broz DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), 1366ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*sector)); 1367f710126cSMilan Broz } 1368ef43aa38SMilan Broz 1369ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1370ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1371ef43aa38SMilan Broz 13728f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 13738f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1374ef43aa38SMilan Broz 1375ef43aa38SMilan Broz return r; 13763a7f6c99SMilan Broz } 13773a7f6c99SMilan Broz 1378ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1379ef43aa38SMilan Broz struct convert_context *ctx, 1380ef43aa38SMilan Broz struct skcipher_request *req, 1381ef43aa38SMilan Broz unsigned int tag_offset) 1382ef43aa38SMilan Broz { 1383ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1384ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1385ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1386ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1387ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1388c13b5487SChristoph Hellwig __le64 *sector; 1389ef43aa38SMilan Broz int r = 0; 1390ef43aa38SMilan Broz 13918f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 13920440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 13938f0009a2SMilan Broz return -EIO; 13948f0009a2SMilan Broz 1395ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1396ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 13978f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1398ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1399ef43aa38SMilan Broz dmreq->ctx = ctx; 1400ef43aa38SMilan Broz 1401ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1402ef43aa38SMilan Broz 1403ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1404ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1405ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1406ef43aa38SMilan Broz 1407ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1408ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1409ef43aa38SMilan Broz 1410ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1411ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1412ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1413ef43aa38SMilan Broz 1414ef43aa38SMilan Broz sg_init_table(sg_in, 1); 14158f0009a2SMilan Broz sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1416ef43aa38SMilan Broz 1417ef43aa38SMilan Broz sg_init_table(sg_out, 1); 14188f0009a2SMilan Broz sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1419ef43aa38SMilan Broz 1420ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1421ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1422ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1423ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1424ef43aa38SMilan Broz } else { 1425ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1426ef43aa38SMilan Broz if (r < 0) 1427ef43aa38SMilan Broz return r; 1428bbb16584SMilan Broz /* Data can be already preprocessed in generator */ 1429bbb16584SMilan Broz if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) 1430bbb16584SMilan Broz sg_in = sg_out; 1431ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1432ef43aa38SMilan Broz if (cc->integrity_iv_size) 1433ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1434ef43aa38SMilan Broz } 1435ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1436ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1437ef43aa38SMilan Broz } 1438ef43aa38SMilan Broz 14398f0009a2SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 14403a7f6c99SMilan Broz 14413a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1442bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 14433a7f6c99SMilan Broz else 1444bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 14453a7f6c99SMilan Broz 14462dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1447ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1448ef43aa38SMilan Broz 14498f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 14508f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 14512dc5327dSMilan Broz 14523a7f6c99SMilan Broz return r; 145301482b76SMilan Broz } 145401482b76SMilan Broz 145595497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 145695497a96SMilan Broz int error); 1457c0297721SAndi Kleen 1458d68b2958SIgnat Korchagin static int crypt_alloc_req_skcipher(struct crypt_config *cc, 1459ddd42edfSMilan Broz struct convert_context *ctx) 1460ddd42edfSMilan Broz { 1461c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1462c0297721SAndi Kleen 1463d68b2958SIgnat Korchagin if (!ctx->r.req) { 1464d68b2958SIgnat Korchagin ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1465ef43aa38SMilan Broz if (!ctx->r.req) 1466d68b2958SIgnat Korchagin return -ENOMEM; 1467d68b2958SIgnat Korchagin } 1468c0297721SAndi Kleen 1469ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 147054cea3f6SMilan Broz 147154cea3f6SMilan Broz /* 147254cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 147354cea3f6SMilan Broz * requests if driver request queue is full. 147454cea3f6SMilan Broz */ 1475ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1476432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1477ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1478d68b2958SIgnat Korchagin 1479d68b2958SIgnat Korchagin return 0; 1480ddd42edfSMilan Broz } 1481ddd42edfSMilan Broz 1482d68b2958SIgnat Korchagin static int crypt_alloc_req_aead(struct crypt_config *cc, 1483ef43aa38SMilan Broz struct convert_context *ctx) 1484ef43aa38SMilan Broz { 1485004b8ae9SIgnat Korchagin if (!ctx->r.req_aead) { 1486004b8ae9SIgnat Korchagin ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1487004b8ae9SIgnat Korchagin if (!ctx->r.req_aead) 1488d68b2958SIgnat Korchagin return -ENOMEM; 1489d68b2958SIgnat Korchagin } 1490ef43aa38SMilan Broz 1491ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1492ef43aa38SMilan Broz 1493ef43aa38SMilan Broz /* 1494ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1495ef43aa38SMilan Broz * requests if driver request queue is full. 1496ef43aa38SMilan Broz */ 1497ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1498432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1499ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1500d68b2958SIgnat Korchagin 1501d68b2958SIgnat Korchagin return 0; 1502ef43aa38SMilan Broz } 1503ef43aa38SMilan Broz 1504d68b2958SIgnat Korchagin static int crypt_alloc_req(struct crypt_config *cc, 1505ef43aa38SMilan Broz struct convert_context *ctx) 1506ef43aa38SMilan Broz { 150733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1508d68b2958SIgnat Korchagin return crypt_alloc_req_aead(cc, ctx); 1509ef43aa38SMilan Broz else 1510d68b2958SIgnat Korchagin return crypt_alloc_req_skcipher(cc, ctx); 1511ef43aa38SMilan Broz } 1512ef43aa38SMilan Broz 1513ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1514bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1515298a9fa0SMikulas Patocka { 1516298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1517298a9fa0SMikulas Patocka 1518bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 15196f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1520298a9fa0SMikulas Patocka } 1521298a9fa0SMikulas Patocka 1522ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1523ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1524ef43aa38SMilan Broz { 1525ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1526ef43aa38SMilan Broz 1527ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 15286f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1529ef43aa38SMilan Broz } 1530ef43aa38SMilan Broz 1531ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1532ef43aa38SMilan Broz { 153333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1534ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1535ef43aa38SMilan Broz else 1536ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1537ef43aa38SMilan Broz } 1538ef43aa38SMilan Broz 15391da177e4SLinus Torvalds /* 15401da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 15411da177e4SLinus Torvalds */ 15424e4cbee9SChristoph Hellwig static blk_status_t crypt_convert(struct crypt_config *cc, 15438abec36dSIgnat Korchagin struct convert_context *ctx, bool atomic, bool reset_pending) 15441da177e4SLinus Torvalds { 1545ef43aa38SMilan Broz unsigned int tag_offset = 0; 1546ff3af92bSMikulas Patocka unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 15473f1e9070SMilan Broz int r; 15481da177e4SLinus Torvalds 15498abec36dSIgnat Korchagin /* 15508abec36dSIgnat Korchagin * if reset_pending is set we are dealing with the bio for the first time, 15518abec36dSIgnat Korchagin * else we're continuing to work on the previous bio, so don't mess with 15528abec36dSIgnat Korchagin * the cc_pending counter 15538abec36dSIgnat Korchagin */ 15548abec36dSIgnat Korchagin if (reset_pending) 155540b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1556c8081618SMilan Broz 1557003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 15581da177e4SLinus Torvalds 1559d68b2958SIgnat Korchagin r = crypt_alloc_req(cc, ctx); 1560d68b2958SIgnat Korchagin if (r) { 1561d68b2958SIgnat Korchagin complete(&ctx->restart); 1562d68b2958SIgnat Korchagin return BLK_STS_DEV_RESOURCE; 1563d68b2958SIgnat Korchagin } 1564d68b2958SIgnat Korchagin 156540b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 15663f1e9070SMilan Broz 156733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1568ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1569ef43aa38SMilan Broz else 1570ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 15713a7f6c99SMilan Broz 15723a7f6c99SMilan Broz switch (r) { 157354cea3f6SMilan Broz /* 157454cea3f6SMilan Broz * The request was queued by a crypto driver 157554cea3f6SMilan Broz * but the driver request queue is full, let's wait. 157654cea3f6SMilan Broz */ 15773a7f6c99SMilan Broz case -EBUSY: 15788abec36dSIgnat Korchagin if (in_interrupt()) { 15798abec36dSIgnat Korchagin if (try_wait_for_completion(&ctx->restart)) { 15808abec36dSIgnat Korchagin /* 15818abec36dSIgnat Korchagin * we don't have to block to wait for completion, 15828abec36dSIgnat Korchagin * so proceed 15838abec36dSIgnat Korchagin */ 15848abec36dSIgnat Korchagin } else { 15858abec36dSIgnat Korchagin /* 15868abec36dSIgnat Korchagin * we can't wait for completion without blocking 15878abec36dSIgnat Korchagin * exit and continue processing in a workqueue 15888abec36dSIgnat Korchagin */ 15898abec36dSIgnat Korchagin ctx->r.req = NULL; 15908abec36dSIgnat Korchagin ctx->cc_sector += sector_step; 15918abec36dSIgnat Korchagin tag_offset++; 15928abec36dSIgnat Korchagin return BLK_STS_DEV_RESOURCE; 15938abec36dSIgnat Korchagin } 15948abec36dSIgnat Korchagin } else { 15953a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 15968abec36dSIgnat Korchagin } 159716735d02SWolfram Sang reinit_completion(&ctx->restart); 1598df561f66SGustavo A. R. Silva fallthrough; 159954cea3f6SMilan Broz /* 160054cea3f6SMilan Broz * The request is queued and processed asynchronously, 160154cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 160254cea3f6SMilan Broz */ 1603c0403ec0SRabin Vincent case -EINPROGRESS: 1604ef43aa38SMilan Broz ctx->r.req = NULL; 16058f0009a2SMilan Broz ctx->cc_sector += sector_step; 1606583fe747SMikulas Patocka tag_offset++; 16073a7f6c99SMilan Broz continue; 160854cea3f6SMilan Broz /* 160954cea3f6SMilan Broz * The request was already processed (synchronously). 161054cea3f6SMilan Broz */ 16113f1e9070SMilan Broz case 0: 161240b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 16138f0009a2SMilan Broz ctx->cc_sector += sector_step; 1614583fe747SMikulas Patocka tag_offset++; 161539d42fa9SIgnat Korchagin if (!atomic) 1616c7f1b204SMilan Broz cond_resched(); 16173f1e9070SMilan Broz continue; 1618ef43aa38SMilan Broz /* 1619ef43aa38SMilan Broz * There was a data integrity error. 1620ef43aa38SMilan Broz */ 1621ef43aa38SMilan Broz case -EBADMSG: 1622ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 16234e4cbee9SChristoph Hellwig return BLK_STS_PROTECTION; 1624ef43aa38SMilan Broz /* 1625ef43aa38SMilan Broz * There was an error while processing the request. 1626ef43aa38SMilan Broz */ 16273f1e9070SMilan Broz default: 162840b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 16294e4cbee9SChristoph Hellwig return BLK_STS_IOERR; 16301da177e4SLinus Torvalds } 16313f1e9070SMilan Broz } 16323f1e9070SMilan Broz 16333f1e9070SMilan Broz return 0; 16343f1e9070SMilan Broz } 16351da177e4SLinus Torvalds 1636cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1637cf2f1abfSMikulas Patocka 16381da177e4SLinus Torvalds /* 16391da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1640586b286bSMike Snitzer * This should never violate the device limitations (but only because 1641586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 16427145c241SMikulas Patocka * 16437145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 16447145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 16457145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 16467145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 16477145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 16487145c241SMikulas Patocka * 16497145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 16507145c241SMikulas Patocka * 16517145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 16527145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 16537145c241SMikulas Patocka * to blocking allocations with a mutex. 16541da177e4SLinus Torvalds */ 1655cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 16561da177e4SLinus Torvalds { 165749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16588b004457SMilan Broz struct bio *clone; 16591da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 16607145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 16617145c241SMikulas Patocka unsigned i, len, remaining_size; 166291e10625SMilan Broz struct page *page; 16631da177e4SLinus Torvalds 16647145c241SMikulas Patocka retry: 1665d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 16667145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 16677145c241SMikulas Patocka 16686f1c819cSKent Overstreet clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs); 16698b004457SMilan Broz if (!clone) 1670ef43aa38SMilan Broz goto out; 16711da177e4SLinus Torvalds 1672027581f3SOlaf Kirch clone_init(io, clone); 16736a24c718SMilan Broz 16747145c241SMikulas Patocka remaining_size = size; 16757145c241SMikulas Patocka 1676f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 16776f1c819cSKent Overstreet page = mempool_alloc(&cc->page_pool, gfp_mask); 16787145c241SMikulas Patocka if (!page) { 16797145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 16807145c241SMikulas Patocka bio_put(clone); 1681d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 16827145c241SMikulas Patocka goto retry; 16837145c241SMikulas Patocka } 16841da177e4SLinus Torvalds 16857145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 16861da177e4SLinus Torvalds 16870dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 168891e10625SMilan Broz 16897145c241SMikulas Patocka remaining_size -= len; 16901da177e4SLinus Torvalds } 16911da177e4SLinus Torvalds 1692ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1693ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1694ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1695ef43aa38SMilan Broz bio_put(clone); 1696ef43aa38SMilan Broz clone = NULL; 1697ef43aa38SMilan Broz } 1698ef43aa38SMilan Broz out: 1699d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 17007145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 17017145c241SMikulas Patocka 17028b004457SMilan Broz return clone; 17031da177e4SLinus Torvalds } 17041da177e4SLinus Torvalds 1705644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 17061da177e4SLinus Torvalds { 17071da177e4SLinus Torvalds struct bio_vec *bv; 17086dc4f100SMing Lei struct bvec_iter_all iter_all; 17091da177e4SLinus Torvalds 17102b070cfeSChristoph Hellwig bio_for_each_segment_all(bv, clone, iter_all) { 17111da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 17126f1c819cSKent Overstreet mempool_free(bv->bv_page, &cc->page_pool); 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds } 17151da177e4SLinus Torvalds 1716298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1717dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1718dc440d1eSMilan Broz { 171949a8a920SAlasdair G Kergon io->cc = cc; 1720dc440d1eSMilan Broz io->base_bio = bio; 1721dc440d1eSMilan Broz io->sector = sector; 1722dc440d1eSMilan Broz io->error = 0; 1723ef43aa38SMilan Broz io->ctx.r.req = NULL; 1724ef43aa38SMilan Broz io->integrity_metadata = NULL; 1725ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 172640b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1727dc440d1eSMilan Broz } 1728dc440d1eSMilan Broz 17293e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 17303e1a8bddSMilan Broz { 173140b6229bSMikulas Patocka atomic_inc(&io->io_pending); 17323e1a8bddSMilan Broz } 17333e1a8bddSMilan Broz 17348e14f610SIgnat Korchagin static void kcryptd_io_bio_endio(struct work_struct *work) 17358e14f610SIgnat Korchagin { 17368e14f610SIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 17378e14f610SIgnat Korchagin bio_endio(io->base_bio); 17388e14f610SIgnat Korchagin } 17398e14f610SIgnat Korchagin 17401da177e4SLinus Torvalds /* 17411da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 17421da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 17431da177e4SLinus Torvalds */ 17445742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 17451da177e4SLinus Torvalds { 174649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1747b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 17484e4cbee9SChristoph Hellwig blk_status_t error = io->error; 17491da177e4SLinus Torvalds 175040b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 17511da177e4SLinus Torvalds return; 17521da177e4SLinus Torvalds 1753ef43aa38SMilan Broz if (io->ctx.r.req) 1754ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1755ef43aa38SMilan Broz 1756ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 17576f1c819cSKent Overstreet mempool_free(io->integrity_metadata, &io->cc->tag_pool); 1758ef43aa38SMilan Broz else 1759ef43aa38SMilan Broz kfree(io->integrity_metadata); 1760b35f8caaSMilan Broz 17614e4cbee9SChristoph Hellwig base_bio->bi_status = error; 17628e14f610SIgnat Korchagin 17638e14f610SIgnat Korchagin /* 17648e14f610SIgnat Korchagin * If we are running this function from our tasklet, 17658e14f610SIgnat Korchagin * we can't call bio_endio() here, because it will call 17668e14f610SIgnat Korchagin * clone_endio() from dm.c, which in turn will 17678e14f610SIgnat Korchagin * free the current struct dm_crypt_io structure with 17688e14f610SIgnat Korchagin * our tasklet. In this case we need to delay bio_endio() 17698e14f610SIgnat Korchagin * execution to after the tasklet is done and dequeued. 17708e14f610SIgnat Korchagin */ 17718e14f610SIgnat Korchagin if (tasklet_trylock(&io->tasklet)) { 17728e14f610SIgnat Korchagin tasklet_unlock(&io->tasklet); 17734246a0b6SChristoph Hellwig bio_endio(base_bio); 17748e14f610SIgnat Korchagin return; 17758e14f610SIgnat Korchagin } 17768e14f610SIgnat Korchagin 17778e14f610SIgnat Korchagin INIT_WORK(&io->work, kcryptd_io_bio_endio); 17788e14f610SIgnat Korchagin queue_work(cc->io_queue, &io->work); 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* 1782cabf08e4SMilan Broz * kcryptd/kcryptd_io: 17831da177e4SLinus Torvalds * 17841da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 178523541d2dSMilan Broz * interrupt context. 1786cabf08e4SMilan Broz * 1787cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1788cabf08e4SMilan Broz * 1789cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1790cabf08e4SMilan Broz * 1791cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1792cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1793cabf08e4SMilan Broz * to memory allocation. 1794c0297721SAndi Kleen * 1795c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1796c0297721SAndi Kleen * They should not depend on each other and do not block. 17971da177e4SLinus Torvalds */ 17984246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 17998b004457SMilan Broz { 1800028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 180149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1802ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 18034e4cbee9SChristoph Hellwig blk_status_t error; 18048b004457SMilan Broz 18058b004457SMilan Broz /* 18066712ecf8SNeilBrown * free the processed pages 18078b004457SMilan Broz */ 1808ee7a491eSMilan Broz if (rw == WRITE) 1809644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 18108b004457SMilan Broz 18114e4cbee9SChristoph Hellwig error = clone->bi_status; 18128b004457SMilan Broz bio_put(clone); 1813ee7a491eSMilan Broz 18149b81c842SSasha Levin if (rw == READ && !error) { 1815cabf08e4SMilan Broz kcryptd_queue_crypt(io); 18166712ecf8SNeilBrown return; 1817ee7a491eSMilan Broz } 18185742fd77SMilan Broz 18199b81c842SSasha Levin if (unlikely(error)) 18209b81c842SSasha Levin io->error = error; 18215742fd77SMilan Broz 18225742fd77SMilan Broz crypt_dec_pending(io); 18238b004457SMilan Broz } 18248b004457SMilan Broz 1825028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 18268b004457SMilan Broz { 182749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 18288b004457SMilan Broz 18298b004457SMilan Broz clone->bi_private = io; 18308b004457SMilan Broz clone->bi_end_io = crypt_endio; 183174d46992SChristoph Hellwig bio_set_dev(clone, cc->dev->bdev); 1832ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 18338b004457SMilan Broz } 18348b004457SMilan Broz 183520c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 18368b004457SMilan Broz { 183749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 18388b004457SMilan Broz struct bio *clone; 183993e605c2SMilan Broz 18408b004457SMilan Broz /* 184159779079SMike Snitzer * We need the original biovec array in order to decrypt 184259779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 184359779079SMike Snitzer * biovecs we don't need to worry about the block layer 184459779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 18458b004457SMilan Broz */ 18466f1c819cSKent Overstreet clone = bio_clone_fast(io->base_bio, gfp, &cc->bs); 18477eaceaccSJens Axboe if (!clone) 184820c82538SMilan Broz return 1; 18498b004457SMilan Broz 185020c82538SMilan Broz crypt_inc_pending(io); 185120c82538SMilan Broz 18528b004457SMilan Broz clone_init(io, clone); 18534f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 18548b004457SMilan Broz 1855ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1856ef43aa38SMilan Broz crypt_dec_pending(io); 1857ef43aa38SMilan Broz bio_put(clone); 1858ef43aa38SMilan Broz return 1; 1859ef43aa38SMilan Broz } 1860ef43aa38SMilan Broz 1861ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 186220c82538SMilan Broz return 0; 18638b004457SMilan Broz } 18648b004457SMilan Broz 1865dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1866395b167cSAlasdair G Kergon { 1867395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1868395b167cSAlasdair G Kergon 186920c82538SMilan Broz crypt_inc_pending(io); 187020c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 18714e4cbee9SChristoph Hellwig io->error = BLK_STS_RESOURCE; 187220c82538SMilan Broz crypt_dec_pending(io); 1873395b167cSAlasdair G Kergon } 1874395b167cSAlasdair G Kergon 1875dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1876395b167cSAlasdair G Kergon { 187749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1878395b167cSAlasdair G Kergon 1879dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1880395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1881395b167cSAlasdair G Kergon } 1882395b167cSAlasdair G Kergon 1883dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1884dc267621SMikulas Patocka { 1885dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1886dc267621SMikulas Patocka 1887ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 1888dc267621SMikulas Patocka } 1889dc267621SMikulas Patocka 1890b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1891b3c5fd30SMikulas Patocka 1892dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1893dc267621SMikulas Patocka { 1894dc267621SMikulas Patocka struct crypt_config *cc = data; 1895b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1896b3c5fd30SMikulas Patocka 1897dc267621SMikulas Patocka while (1) { 1898b3c5fd30SMikulas Patocka struct rb_root write_tree; 1899dc267621SMikulas Patocka struct blk_plug plug; 1900dc267621SMikulas Patocka 1901c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1902dc267621SMikulas Patocka continue_locked: 1903dc267621SMikulas Patocka 1904b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1905dc267621SMikulas Patocka goto pop_from_list; 1906dc267621SMikulas Patocka 1907f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1908dc267621SMikulas Patocka 1909c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1910dc267621SMikulas Patocka 1911f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1912642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1913f659b100SRabin Vincent break; 1914f659b100SRabin Vincent } 1915f659b100SRabin Vincent 1916dc267621SMikulas Patocka schedule(); 1917dc267621SMikulas Patocka 1918642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1919c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1920dc267621SMikulas Patocka goto continue_locked; 1921dc267621SMikulas Patocka 1922dc267621SMikulas Patocka pop_from_list: 1923b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1924b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1925c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1926dc267621SMikulas Patocka 1927b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1928b3c5fd30SMikulas Patocka 1929b3c5fd30SMikulas Patocka /* 1930b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1931b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1932b3c5fd30SMikulas Patocka */ 1933dc267621SMikulas Patocka blk_start_plug(&plug); 1934dc267621SMikulas Patocka do { 1935b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1936b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1937dc267621SMikulas Patocka kcryptd_io_write(io); 1938b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1939dc267621SMikulas Patocka blk_finish_plug(&plug); 1940dc267621SMikulas Patocka } 1941dc267621SMikulas Patocka return 0; 1942dc267621SMikulas Patocka } 1943dc267621SMikulas Patocka 194472c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 19454e4eef64SMilan Broz { 1946dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 194749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1948dc267621SMikulas Patocka unsigned long flags; 1949b3c5fd30SMikulas Patocka sector_t sector; 1950b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1951dec1cedfSMilan Broz 19524e4cbee9SChristoph Hellwig if (unlikely(io->error)) { 1953dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1954dec1cedfSMilan Broz bio_put(clone); 19556c031f41SMilan Broz crypt_dec_pending(io); 1956dec1cedfSMilan Broz return; 1957dec1cedfSMilan Broz } 1958dec1cedfSMilan Broz 1959dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1960003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1961dec1cedfSMilan Broz 19624f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1963899c95d3SMilan Broz 196439d42fa9SIgnat Korchagin if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) || 196539d42fa9SIgnat Korchagin test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) { 1966ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 19670f5d8e6eSMikulas Patocka return; 19680f5d8e6eSMikulas Patocka } 19690f5d8e6eSMikulas Patocka 1970c7329effSMikulas Patocka spin_lock_irqsave(&cc->write_thread_lock, flags); 1971c7329effSMikulas Patocka if (RB_EMPTY_ROOT(&cc->write_tree)) 1972c7329effSMikulas Patocka wake_up_process(cc->write_thread); 1973b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1974b3c5fd30SMikulas Patocka parent = NULL; 1975b3c5fd30SMikulas Patocka sector = io->sector; 1976b3c5fd30SMikulas Patocka while (*rbp) { 1977b3c5fd30SMikulas Patocka parent = *rbp; 1978b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1979b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1980b3c5fd30SMikulas Patocka else 1981b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1982b3c5fd30SMikulas Patocka } 1983b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1984b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1985c7329effSMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_lock, flags); 19864e4eef64SMilan Broz } 19874e4eef64SMilan Broz 19888e225f04SDamien Le Moal static bool kcryptd_crypt_write_inline(struct crypt_config *cc, 19898e225f04SDamien Le Moal struct convert_context *ctx) 19908e225f04SDamien Le Moal 19918e225f04SDamien Le Moal { 19928e225f04SDamien Le Moal if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags)) 19938e225f04SDamien Le Moal return false; 19948e225f04SDamien Le Moal 19958e225f04SDamien Le Moal /* 19968e225f04SDamien Le Moal * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering 19978e225f04SDamien Le Moal * constraints so they do not need to be issued inline by 19988e225f04SDamien Le Moal * kcryptd_crypt_write_convert(). 19998e225f04SDamien Le Moal */ 20008e225f04SDamien Le Moal switch (bio_op(ctx->bio_in)) { 20018e225f04SDamien Le Moal case REQ_OP_WRITE: 20028e225f04SDamien Le Moal case REQ_OP_WRITE_SAME: 20038e225f04SDamien Le Moal case REQ_OP_WRITE_ZEROES: 20048e225f04SDamien Le Moal return true; 20058e225f04SDamien Le Moal default: 20068e225f04SDamien Le Moal return false; 20078e225f04SDamien Le Moal } 20088e225f04SDamien Le Moal } 20098e225f04SDamien Le Moal 20108abec36dSIgnat Korchagin static void kcryptd_crypt_write_continue(struct work_struct *work) 20118abec36dSIgnat Korchagin { 20128abec36dSIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 20138abec36dSIgnat Korchagin struct crypt_config *cc = io->cc; 20148abec36dSIgnat Korchagin struct convert_context *ctx = &io->ctx; 20158abec36dSIgnat Korchagin int crypt_finished; 20168abec36dSIgnat Korchagin sector_t sector = io->sector; 20178abec36dSIgnat Korchagin blk_status_t r; 20188abec36dSIgnat Korchagin 20198abec36dSIgnat Korchagin wait_for_completion(&ctx->restart); 20208abec36dSIgnat Korchagin reinit_completion(&ctx->restart); 20218abec36dSIgnat Korchagin 20228abec36dSIgnat Korchagin r = crypt_convert(cc, &io->ctx, true, false); 20238abec36dSIgnat Korchagin if (r) 20248abec36dSIgnat Korchagin io->error = r; 20258abec36dSIgnat Korchagin crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 20268abec36dSIgnat Korchagin if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 20278abec36dSIgnat Korchagin /* Wait for completion signaled by kcryptd_async_done() */ 20288abec36dSIgnat Korchagin wait_for_completion(&ctx->restart); 20298abec36dSIgnat Korchagin crypt_finished = 1; 20308abec36dSIgnat Korchagin } 20318abec36dSIgnat Korchagin 20328abec36dSIgnat Korchagin /* Encryption was already finished, submit io now */ 20338abec36dSIgnat Korchagin if (crypt_finished) { 20348abec36dSIgnat Korchagin kcryptd_crypt_write_io_submit(io, 0); 20358abec36dSIgnat Korchagin io->sector = sector; 20368abec36dSIgnat Korchagin } 20378abec36dSIgnat Korchagin 20388abec36dSIgnat Korchagin crypt_dec_pending(io); 20398abec36dSIgnat Korchagin } 20408abec36dSIgnat Korchagin 2041fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 20428b004457SMilan Broz { 204349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 20448e225f04SDamien Le Moal struct convert_context *ctx = &io->ctx; 20458b004457SMilan Broz struct bio *clone; 2046c8081618SMilan Broz int crypt_finished; 2047b635b00eSMilan Broz sector_t sector = io->sector; 20484e4cbee9SChristoph Hellwig blk_status_t r; 20498b004457SMilan Broz 205093e605c2SMilan Broz /* 2051fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 2052fc5a5e9aSMilan Broz */ 2053fc5a5e9aSMilan Broz crypt_inc_pending(io); 20548e225f04SDamien Le Moal crypt_convert_init(cc, ctx, NULL, io->base_bio, sector); 2055fc5a5e9aSMilan Broz 2056cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 205723541d2dSMilan Broz if (unlikely(!clone)) { 20584e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 2059cf2f1abfSMikulas Patocka goto dec; 206023541d2dSMilan Broz } 20618b004457SMilan Broz 206253017030SMilan Broz io->ctx.bio_out = clone; 2063003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 20648b004457SMilan Broz 2065b635b00eSMilan Broz sector += bio_sectors(clone); 2066dec1cedfSMilan Broz 20674e594098SMilan Broz crypt_inc_pending(io); 20688e225f04SDamien Le Moal r = crypt_convert(cc, ctx, 20698abec36dSIgnat Korchagin test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true); 20708abec36dSIgnat Korchagin /* 20718abec36dSIgnat Korchagin * Crypto API backlogged the request, because its queue was full 20728abec36dSIgnat Korchagin * and we're in softirq context, so continue from a workqueue 20738abec36dSIgnat Korchagin * (TODO: is it actually possible to be in softirq in the write path?) 20748abec36dSIgnat Korchagin */ 20758abec36dSIgnat Korchagin if (r == BLK_STS_DEV_RESOURCE) { 20768abec36dSIgnat Korchagin INIT_WORK(&io->work, kcryptd_crypt_write_continue); 20778abec36dSIgnat Korchagin queue_work(cc->crypt_queue, &io->work); 20788abec36dSIgnat Korchagin return; 20798abec36dSIgnat Korchagin } 20804e4cbee9SChristoph Hellwig if (r) 2081ef43aa38SMilan Broz io->error = r; 20828e225f04SDamien Le Moal crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 20838e225f04SDamien Le Moal if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 20848e225f04SDamien Le Moal /* Wait for completion signaled by kcryptd_async_done() */ 20858e225f04SDamien Le Moal wait_for_completion(&ctx->restart); 20868e225f04SDamien Le Moal crypt_finished = 1; 20878e225f04SDamien Le Moal } 2088dec1cedfSMilan Broz 2089c8081618SMilan Broz /* Encryption was already finished, submit io now */ 2090c8081618SMilan Broz if (crypt_finished) { 209172c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 2092b635b00eSMilan Broz io->sector = sector; 20934e594098SMilan Broz } 209493e605c2SMilan Broz 2095cf2f1abfSMikulas Patocka dec: 2096899c95d3SMilan Broz crypt_dec_pending(io); 209784131db6SMilan Broz } 209884131db6SMilan Broz 209972c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 21005742fd77SMilan Broz { 21015742fd77SMilan Broz crypt_dec_pending(io); 21025742fd77SMilan Broz } 21035742fd77SMilan Broz 21048abec36dSIgnat Korchagin static void kcryptd_crypt_read_continue(struct work_struct *work) 21058abec36dSIgnat Korchagin { 21068abec36dSIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 21078abec36dSIgnat Korchagin struct crypt_config *cc = io->cc; 21088abec36dSIgnat Korchagin blk_status_t r; 21098abec36dSIgnat Korchagin 21108abec36dSIgnat Korchagin wait_for_completion(&io->ctx.restart); 21118abec36dSIgnat Korchagin reinit_completion(&io->ctx.restart); 21128abec36dSIgnat Korchagin 21138abec36dSIgnat Korchagin r = crypt_convert(cc, &io->ctx, true, false); 21148abec36dSIgnat Korchagin if (r) 21158abec36dSIgnat Korchagin io->error = r; 21168abec36dSIgnat Korchagin 21178abec36dSIgnat Korchagin if (atomic_dec_and_test(&io->ctx.cc_pending)) 21188abec36dSIgnat Korchagin kcryptd_crypt_read_done(io); 21198abec36dSIgnat Korchagin 21208abec36dSIgnat Korchagin crypt_dec_pending(io); 21218abec36dSIgnat Korchagin } 21228abec36dSIgnat Korchagin 21234e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 21248b004457SMilan Broz { 212549a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 21264e4cbee9SChristoph Hellwig blk_status_t r; 21278b004457SMilan Broz 21283e1a8bddSMilan Broz crypt_inc_pending(io); 21293a7f6c99SMilan Broz 213053017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 21310c395b0fSMilan Broz io->sector); 21328b004457SMilan Broz 213339d42fa9SIgnat Korchagin r = crypt_convert(cc, &io->ctx, 21348abec36dSIgnat Korchagin test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 21358abec36dSIgnat Korchagin /* 21368abec36dSIgnat Korchagin * Crypto API backlogged the request, because its queue was full 21378abec36dSIgnat Korchagin * and we're in softirq context, so continue from a workqueue 21388abec36dSIgnat Korchagin */ 21398abec36dSIgnat Korchagin if (r == BLK_STS_DEV_RESOURCE) { 21408abec36dSIgnat Korchagin INIT_WORK(&io->work, kcryptd_crypt_read_continue); 21418abec36dSIgnat Korchagin queue_work(cc->crypt_queue, &io->work); 21428abec36dSIgnat Korchagin return; 21438abec36dSIgnat Korchagin } 21444e4cbee9SChristoph Hellwig if (r) 2145ef43aa38SMilan Broz io->error = r; 21465742fd77SMilan Broz 214740b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 214872c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 21493a7f6c99SMilan Broz 21503a7f6c99SMilan Broz crypt_dec_pending(io); 21518b004457SMilan Broz } 21528b004457SMilan Broz 215395497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 215495497a96SMilan Broz int error) 215595497a96SMilan Broz { 2156b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 2157b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 215895497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 215949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 216095497a96SMilan Broz 216154cea3f6SMilan Broz /* 216254cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 216354cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 216454cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 216554cea3f6SMilan Broz */ 2166c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 2167c0403ec0SRabin Vincent complete(&ctx->restart); 216895497a96SMilan Broz return; 2169c0403ec0SRabin Vincent } 217095497a96SMilan Broz 21712dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 2172ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 21732dc5327dSMilan Broz 2174ef43aa38SMilan Broz if (error == -EBADMSG) { 2175f710126cSMilan Broz char b[BDEVNAME_SIZE]; 2176f710126cSMilan Broz DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), 2177ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); 21784e4cbee9SChristoph Hellwig io->error = BLK_STS_PROTECTION; 2179ef43aa38SMilan Broz } else if (error < 0) 21804e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 218172c6e7afSMikulas Patocka 2182298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 218395497a96SMilan Broz 218440b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 2185c0403ec0SRabin Vincent return; 218695497a96SMilan Broz 21878e225f04SDamien Le Moal /* 21888e225f04SDamien Le Moal * The request is fully completed: for inline writes, let 21898e225f04SDamien Le Moal * kcryptd_crypt_write_convert() do the IO submission. 21908e225f04SDamien Le Moal */ 21918e225f04SDamien Le Moal if (bio_data_dir(io->base_bio) == READ) { 219272c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 21938e225f04SDamien Le Moal return; 21948e225f04SDamien Le Moal } 21958e225f04SDamien Le Moal 21968e225f04SDamien Le Moal if (kcryptd_crypt_write_inline(cc, ctx)) { 21978e225f04SDamien Le Moal complete(&ctx->restart); 21988e225f04SDamien Le Moal return; 21998e225f04SDamien Le Moal } 22008e225f04SDamien Le Moal 220172c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 220295497a96SMilan Broz } 220395497a96SMilan Broz 22044e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 22054e4eef64SMilan Broz { 22064e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 22074e4eef64SMilan Broz 22084e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 22094e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 22104e4eef64SMilan Broz else 22114e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 22128b004457SMilan Broz } 22138b004457SMilan Broz 221439d42fa9SIgnat Korchagin static void kcryptd_crypt_tasklet(unsigned long work) 221539d42fa9SIgnat Korchagin { 221639d42fa9SIgnat Korchagin kcryptd_crypt((struct work_struct *)work); 221739d42fa9SIgnat Korchagin } 221839d42fa9SIgnat Korchagin 2219395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 2220395b167cSAlasdair G Kergon { 222149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 2222395b167cSAlasdair G Kergon 222339d42fa9SIgnat Korchagin if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) || 222439d42fa9SIgnat Korchagin (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) { 2225c87a95dcSIgnat Korchagin /* 2226c87a95dcSIgnat Korchagin * in_irq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context. 2227c87a95dcSIgnat Korchagin * irqs_disabled(): the kernel may run some IO completion from the idle thread, but 2228c87a95dcSIgnat Korchagin * it is being executed with irqs disabled. 2229c87a95dcSIgnat Korchagin */ 2230c87a95dcSIgnat Korchagin if (in_irq() || irqs_disabled()) { 223139d42fa9SIgnat Korchagin tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work); 223239d42fa9SIgnat Korchagin tasklet_schedule(&io->tasklet); 223339d42fa9SIgnat Korchagin return; 223439d42fa9SIgnat Korchagin } 223539d42fa9SIgnat Korchagin 223639d42fa9SIgnat Korchagin kcryptd_crypt(&io->work); 223739d42fa9SIgnat Korchagin return; 223839d42fa9SIgnat Korchagin } 223939d42fa9SIgnat Korchagin 2240395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 2241395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 2242395b167cSAlasdair G Kergon } 2243395b167cSAlasdair G Kergon 2244ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 22451da177e4SLinus Torvalds { 2246ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 2247ef43aa38SMilan Broz return; 22481da177e4SLinus Torvalds 2249ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2250ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 2251ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 22521da177e4SLinus Torvalds } 22531da177e4SLinus Torvalds 2254ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 2255ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 2256ef43aa38SMilan Broz } 22571da177e4SLinus Torvalds 2258ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 2259d1f96423SMilan Broz { 2260d1f96423SMilan Broz unsigned i; 2261d1f96423SMilan Broz 2262ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2263fd2d231fSMikulas Patocka return; 2264fd2d231fSMikulas Patocka 2265d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 2266ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 2267ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 2268ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 2269d1f96423SMilan Broz } 2270d1f96423SMilan Broz 2271ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 2272ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 22731da177e4SLinus Torvalds } 22741da177e4SLinus Torvalds 22751da177e4SLinus Torvalds static void crypt_free_tfms(struct crypt_config *cc) 2276d1f96423SMilan Broz { 227733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2278ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 2279ef43aa38SMilan Broz else 2280ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 2281d1f96423SMilan Broz } 2282d1f96423SMilan Broz 2283ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 2284d1f96423SMilan Broz { 2285d1f96423SMilan Broz unsigned i; 2286d1f96423SMilan Broz int err; 2287d1f96423SMilan Broz 22886396bb22SKees Cook cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, 22896396bb22SKees Cook sizeof(struct crypto_skcipher *), 22906396bb22SKees Cook GFP_KERNEL); 2291ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2292fd2d231fSMikulas Patocka return -ENOMEM; 2293fd2d231fSMikulas Patocka 2294d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 2295cd746938SMikulas Patocka cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 2296cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 2297ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 2298ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 2299fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2300d1f96423SMilan Broz return err; 2301d1f96423SMilan Broz } 2302d1f96423SMilan Broz } 2303d1f96423SMilan Broz 2304af331ebaSEric Biggers /* 2305af331ebaSEric Biggers * dm-crypt performance can vary greatly depending on which crypto 2306af331ebaSEric Biggers * algorithm implementation is used. Help people debug performance 2307af331ebaSEric Biggers * problems by logging the ->cra_driver_name. 2308af331ebaSEric Biggers */ 23097a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2310af331ebaSEric Biggers crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); 2311d1f96423SMilan Broz return 0; 2312d1f96423SMilan Broz } 2313d1f96423SMilan Broz 2314ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 2315ef43aa38SMilan Broz { 2316ef43aa38SMilan Broz int err; 2317ef43aa38SMilan Broz 2318ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 2319ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2320ef43aa38SMilan Broz return -ENOMEM; 2321ef43aa38SMilan Broz 2322cd746938SMikulas Patocka cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 2323cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 2324ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2325ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 2326ef43aa38SMilan Broz crypt_free_tfms(cc); 2327ef43aa38SMilan Broz return err; 2328ef43aa38SMilan Broz } 2329ef43aa38SMilan Broz 23307a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2331af331ebaSEric Biggers crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); 2332ef43aa38SMilan Broz return 0; 2333ef43aa38SMilan Broz } 2334ef43aa38SMilan Broz 2335ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 2336ef43aa38SMilan Broz { 233733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2338ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 2339ef43aa38SMilan Broz else 2340ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 2341ef43aa38SMilan Broz } 2342ef43aa38SMilan Broz 2343ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 2344ef43aa38SMilan Broz { 2345ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 2346ef43aa38SMilan Broz } 2347ef43aa38SMilan Broz 2348ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 2349ef43aa38SMilan Broz { 2350ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 2351ef43aa38SMilan Broz } 2352ef43aa38SMilan Broz 2353ef43aa38SMilan Broz /* 2354ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 2355ef43aa38SMilan Broz * the key must be for some reason in special format. 2356ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 2357ef43aa38SMilan Broz */ 2358ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 2359ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 2360ef43aa38SMilan Broz { 2361ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 2362ef43aa38SMilan Broz struct rtattr *rta; 2363ef43aa38SMilan Broz 2364ef43aa38SMilan Broz rta = (struct rtattr *)p; 2365ef43aa38SMilan Broz param = RTA_DATA(rta); 2366ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 2367ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 2368ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 2369ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 2370ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 2371ef43aa38SMilan Broz p += authkeylen; 2372ef43aa38SMilan Broz memcpy(p, key, enckeylen); 2373ef43aa38SMilan Broz } 2374ef43aa38SMilan Broz 2375671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 2376c0297721SAndi Kleen { 2377da31a078SMilan Broz unsigned subkey_size; 2378fd2d231fSMikulas Patocka int err = 0, i, r; 2379c0297721SAndi Kleen 2380da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 2381ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 2382da31a078SMilan Broz 238327c70036SMilan Broz if (crypt_integrity_hmac(cc)) { 238427c70036SMilan Broz if (subkey_size < cc->key_mac_size) 238527c70036SMilan Broz return -EINVAL; 238627c70036SMilan Broz 2387ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 2388ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 2389ef43aa38SMilan Broz cc->key_mac_size); 239027c70036SMilan Broz } 239127c70036SMilan Broz 2392d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 239333d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) 239433d2f09fSMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 239533d2f09fSMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 239633d2f09fSMilan Broz else if (crypt_integrity_aead(cc)) 2397ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2398ef43aa38SMilan Broz cc->key + (i * subkey_size), 2399ef43aa38SMilan Broz subkey_size); 2400ef43aa38SMilan Broz else 2401ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 2402fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 2403fd2d231fSMikulas Patocka subkey_size); 2404c0297721SAndi Kleen if (r) 2405c0297721SAndi Kleen err = r; 2406c0297721SAndi Kleen } 2407c0297721SAndi Kleen 2408ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 2409ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 2410ef43aa38SMilan Broz 2411c0297721SAndi Kleen return err; 2412c0297721SAndi Kleen } 2413c0297721SAndi Kleen 2414c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 2415c538f6ecSOndrej Kozina 2416027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 2417027c431cSOndrej Kozina { 2418027c431cSOndrej Kozina while (*str) 2419027c431cSOndrej Kozina if (isspace(*str++)) 2420027c431cSOndrej Kozina return true; 2421027c431cSOndrej Kozina return false; 2422027c431cSOndrej Kozina } 2423027c431cSOndrej Kozina 242427f5411aSDmitry Baryshkov static int set_key_user(struct crypt_config *cc, struct key *key) 242527f5411aSDmitry Baryshkov { 242627f5411aSDmitry Baryshkov const struct user_key_payload *ukp; 242727f5411aSDmitry Baryshkov 242827f5411aSDmitry Baryshkov ukp = user_key_payload_locked(key); 242927f5411aSDmitry Baryshkov if (!ukp) 243027f5411aSDmitry Baryshkov return -EKEYREVOKED; 243127f5411aSDmitry Baryshkov 243227f5411aSDmitry Baryshkov if (cc->key_size != ukp->datalen) 243327f5411aSDmitry Baryshkov return -EINVAL; 243427f5411aSDmitry Baryshkov 243527f5411aSDmitry Baryshkov memcpy(cc->key, ukp->data, cc->key_size); 243627f5411aSDmitry Baryshkov 243727f5411aSDmitry Baryshkov return 0; 243827f5411aSDmitry Baryshkov } 243927f5411aSDmitry Baryshkov 244027f5411aSDmitry Baryshkov static int set_key_encrypted(struct crypt_config *cc, struct key *key) 244127f5411aSDmitry Baryshkov { 244227f5411aSDmitry Baryshkov const struct encrypted_key_payload *ekp; 244327f5411aSDmitry Baryshkov 244427f5411aSDmitry Baryshkov ekp = key->payload.data[0]; 244527f5411aSDmitry Baryshkov if (!ekp) 244627f5411aSDmitry Baryshkov return -EKEYREVOKED; 244727f5411aSDmitry Baryshkov 244827f5411aSDmitry Baryshkov if (cc->key_size != ekp->decrypted_datalen) 244927f5411aSDmitry Baryshkov return -EINVAL; 245027f5411aSDmitry Baryshkov 245127f5411aSDmitry Baryshkov memcpy(cc->key, ekp->decrypted_data, cc->key_size); 245227f5411aSDmitry Baryshkov 245327f5411aSDmitry Baryshkov return 0; 245427f5411aSDmitry Baryshkov } 245527f5411aSDmitry Baryshkov 2456363880c4SAhmad Fatoum static int set_key_trusted(struct crypt_config *cc, struct key *key) 2457363880c4SAhmad Fatoum { 2458363880c4SAhmad Fatoum const struct trusted_key_payload *tkp; 2459363880c4SAhmad Fatoum 2460363880c4SAhmad Fatoum tkp = key->payload.data[0]; 2461363880c4SAhmad Fatoum if (!tkp) 2462363880c4SAhmad Fatoum return -EKEYREVOKED; 2463363880c4SAhmad Fatoum 2464363880c4SAhmad Fatoum if (cc->key_size != tkp->key_len) 2465363880c4SAhmad Fatoum return -EINVAL; 2466363880c4SAhmad Fatoum 2467363880c4SAhmad Fatoum memcpy(cc->key, tkp->key, cc->key_size); 2468363880c4SAhmad Fatoum 2469363880c4SAhmad Fatoum return 0; 2470363880c4SAhmad Fatoum } 2471363880c4SAhmad Fatoum 2472c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2473c538f6ecSOndrej Kozina { 2474c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 2475c538f6ecSOndrej Kozina int ret; 247627f5411aSDmitry Baryshkov struct key_type *type; 2477c538f6ecSOndrej Kozina struct key *key; 247827f5411aSDmitry Baryshkov int (*set_key)(struct crypt_config *cc, struct key *key); 2479c538f6ecSOndrej Kozina 2480027c431cSOndrej Kozina /* 2481027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 2482027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2483027c431cSOndrej Kozina */ 2484027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 2485027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 2486027c431cSOndrej Kozina return -EINVAL; 2487027c431cSOndrej Kozina } 2488027c431cSOndrej Kozina 2489c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 2490c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 2491c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2492c538f6ecSOndrej Kozina return -EINVAL; 2493c538f6ecSOndrej Kozina 249427f5411aSDmitry Baryshkov if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) { 249527f5411aSDmitry Baryshkov type = &key_type_logon; 249627f5411aSDmitry Baryshkov set_key = set_key_user; 249727f5411aSDmitry Baryshkov } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) { 249827f5411aSDmitry Baryshkov type = &key_type_user; 249927f5411aSDmitry Baryshkov set_key = set_key_user; 2500831475ccSAhmad Fatoum } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) && 2501831475ccSAhmad Fatoum !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) { 250227f5411aSDmitry Baryshkov type = &key_type_encrypted; 250327f5411aSDmitry Baryshkov set_key = set_key_encrypted; 2504363880c4SAhmad Fatoum } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) && 2505363880c4SAhmad Fatoum !strncmp(key_string, "trusted:", key_desc - key_string + 1)) { 2506363880c4SAhmad Fatoum type = &key_type_trusted; 2507363880c4SAhmad Fatoum set_key = set_key_trusted; 250827f5411aSDmitry Baryshkov } else { 2509c538f6ecSOndrej Kozina return -EINVAL; 251027f5411aSDmitry Baryshkov } 2511c538f6ecSOndrej Kozina 2512c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2513c538f6ecSOndrej Kozina if (!new_key_string) 2514c538f6ecSOndrej Kozina return -ENOMEM; 2515c538f6ecSOndrej Kozina 251627f5411aSDmitry Baryshkov key = request_key(type, key_desc + 1, NULL); 2517c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2518453431a5SWaiman Long kfree_sensitive(new_key_string); 2519c538f6ecSOndrej Kozina return PTR_ERR(key); 2520c538f6ecSOndrej Kozina } 2521c538f6ecSOndrej Kozina 2522f5b0cba8SOndrej Kozina down_read(&key->sem); 2523c538f6ecSOndrej Kozina 252427f5411aSDmitry Baryshkov ret = set_key(cc, key); 252527f5411aSDmitry Baryshkov if (ret < 0) { 2526f5b0cba8SOndrej Kozina up_read(&key->sem); 2527c538f6ecSOndrej Kozina key_put(key); 2528453431a5SWaiman Long kfree_sensitive(new_key_string); 252927f5411aSDmitry Baryshkov return ret; 2530c538f6ecSOndrej Kozina } 2531c538f6ecSOndrej Kozina 2532f5b0cba8SOndrej Kozina up_read(&key->sem); 2533c538f6ecSOndrej Kozina key_put(key); 2534c538f6ecSOndrej Kozina 2535c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2536c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2537c538f6ecSOndrej Kozina 2538c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2539c538f6ecSOndrej Kozina 2540c538f6ecSOndrej Kozina if (!ret) { 2541c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2542453431a5SWaiman Long kfree_sensitive(cc->key_string); 2543c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2544c538f6ecSOndrej Kozina } else 2545453431a5SWaiman Long kfree_sensitive(new_key_string); 2546c538f6ecSOndrej Kozina 2547c538f6ecSOndrej Kozina return ret; 2548c538f6ecSOndrej Kozina } 2549c538f6ecSOndrej Kozina 2550c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2551c538f6ecSOndrej Kozina { 2552c538f6ecSOndrej Kozina char *colon, dummy; 2553c538f6ecSOndrej Kozina int ret; 2554c538f6ecSOndrej Kozina 2555c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2556c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2557c538f6ecSOndrej Kozina 2558c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2559c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2560c538f6ecSOndrej Kozina if (!colon) 2561c538f6ecSOndrej Kozina return -EINVAL; 2562c538f6ecSOndrej Kozina 2563c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2564c538f6ecSOndrej Kozina return -EINVAL; 2565c538f6ecSOndrej Kozina 2566c538f6ecSOndrej Kozina *key_string = colon; 2567c538f6ecSOndrej Kozina 2568c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2569c538f6ecSOndrej Kozina 2570c538f6ecSOndrej Kozina return ret; 2571c538f6ecSOndrej Kozina } 2572c538f6ecSOndrej Kozina 2573c538f6ecSOndrej Kozina #else 2574c538f6ecSOndrej Kozina 2575c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2576c538f6ecSOndrej Kozina { 2577c538f6ecSOndrej Kozina return -EINVAL; 2578c538f6ecSOndrej Kozina } 2579c538f6ecSOndrej Kozina 2580c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2581c538f6ecSOndrej Kozina { 2582c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2583c538f6ecSOndrej Kozina } 2584c538f6ecSOndrej Kozina 258527f5411aSDmitry Baryshkov #endif /* CONFIG_KEYS */ 2586c538f6ecSOndrej Kozina 2587e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2588e48d4bbfSMilan Broz { 2589de8be5acSMilan Broz int r = -EINVAL; 2590de8be5acSMilan Broz int key_string_len = strlen(key); 2591de8be5acSMilan Broz 259269a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 259369a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2594de8be5acSMilan Broz goto out; 2595e48d4bbfSMilan Broz 2596c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2597c538f6ecSOndrej Kozina if (key[0] == ':') { 2598c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2599c538f6ecSOndrej Kozina goto out; 2600c538f6ecSOndrej Kozina } 2601c538f6ecSOndrej Kozina 2602265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2603265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2604265e9098SOndrej Kozina 2605c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2606453431a5SWaiman Long kfree_sensitive(cc->key_string); 2607c538f6ecSOndrej Kozina cc->key_string = NULL; 2608c538f6ecSOndrej Kozina 2609e944e03eSAndy Shevchenko /* Decode key from its hex representation. */ 2610e944e03eSAndy Shevchenko if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2611de8be5acSMilan Broz goto out; 2612e48d4bbfSMilan Broz 2613671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2614265e9098SOndrej Kozina if (!r) 2615e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2616e48d4bbfSMilan Broz 2617de8be5acSMilan Broz out: 2618de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2619de8be5acSMilan Broz memset(key, '0', key_string_len); 2620de8be5acSMilan Broz 2621de8be5acSMilan Broz return r; 2622e48d4bbfSMilan Broz } 2623e48d4bbfSMilan Broz 2624e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2625e48d4bbfSMilan Broz { 2626c82feeecSOndrej Kozina int r; 2627c82feeecSOndrej Kozina 2628e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2629c82feeecSOndrej Kozina get_random_bytes(&cc->key, cc->key_size); 26304a52ffc7SMilan Broz 26314a52ffc7SMilan Broz /* Wipe IV private keys */ 26324a52ffc7SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 26334a52ffc7SMilan Broz r = cc->iv_gen_ops->wipe(cc); 26344a52ffc7SMilan Broz if (r) 26354a52ffc7SMilan Broz return r; 26364a52ffc7SMilan Broz } 26374a52ffc7SMilan Broz 2638453431a5SWaiman Long kfree_sensitive(cc->key_string); 2639c538f6ecSOndrej Kozina cc->key_string = NULL; 2640c82feeecSOndrej Kozina r = crypt_setkey(cc); 2641c82feeecSOndrej Kozina memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2642c0297721SAndi Kleen 2643c82feeecSOndrej Kozina return r; 2644e48d4bbfSMilan Broz } 2645e48d4bbfSMilan Broz 26465059353dSMikulas Patocka static void crypt_calculate_pages_per_client(void) 26475059353dSMikulas Patocka { 2648ca79b0c2SArun KS unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; 26495059353dSMikulas Patocka 26505059353dSMikulas Patocka if (!dm_crypt_clients_n) 26515059353dSMikulas Patocka return; 26525059353dSMikulas Patocka 26535059353dSMikulas Patocka pages /= dm_crypt_clients_n; 26545059353dSMikulas Patocka if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) 26555059353dSMikulas Patocka pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; 26565059353dSMikulas Patocka dm_crypt_pages_per_client = pages; 26575059353dSMikulas Patocka } 26585059353dSMikulas Patocka 26595059353dSMikulas Patocka static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) 26605059353dSMikulas Patocka { 26615059353dSMikulas Patocka struct crypt_config *cc = pool_data; 26625059353dSMikulas Patocka struct page *page; 26635059353dSMikulas Patocka 26645059353dSMikulas Patocka if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) && 26655059353dSMikulas Patocka likely(gfp_mask & __GFP_NORETRY)) 26665059353dSMikulas Patocka return NULL; 26675059353dSMikulas Patocka 26685059353dSMikulas Patocka page = alloc_page(gfp_mask); 26695059353dSMikulas Patocka if (likely(page != NULL)) 26705059353dSMikulas Patocka percpu_counter_add(&cc->n_allocated_pages, 1); 26715059353dSMikulas Patocka 26725059353dSMikulas Patocka return page; 26735059353dSMikulas Patocka } 26745059353dSMikulas Patocka 26755059353dSMikulas Patocka static void crypt_page_free(void *page, void *pool_data) 26765059353dSMikulas Patocka { 26775059353dSMikulas Patocka struct crypt_config *cc = pool_data; 26785059353dSMikulas Patocka 26795059353dSMikulas Patocka __free_page(page); 26805059353dSMikulas Patocka percpu_counter_sub(&cc->n_allocated_pages, 1); 26815059353dSMikulas Patocka } 26825059353dSMikulas Patocka 268328513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 268428513fccSMilan Broz { 268528513fccSMilan Broz struct crypt_config *cc = ti->private; 268628513fccSMilan Broz 268728513fccSMilan Broz ti->private = NULL; 268828513fccSMilan Broz 268928513fccSMilan Broz if (!cc) 269028513fccSMilan Broz return; 269128513fccSMilan Broz 2692f659b100SRabin Vincent if (cc->write_thread) 2693dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2694dc267621SMikulas Patocka 269528513fccSMilan Broz if (cc->io_queue) 269628513fccSMilan Broz destroy_workqueue(cc->io_queue); 269728513fccSMilan Broz if (cc->crypt_queue) 269828513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 269928513fccSMilan Broz 2700fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2701fd2d231fSMikulas Patocka 27026f1c819cSKent Overstreet bioset_exit(&cc->bs); 270328513fccSMilan Broz 27046f1c819cSKent Overstreet mempool_exit(&cc->page_pool); 27056f1c819cSKent Overstreet mempool_exit(&cc->req_pool); 27066f1c819cSKent Overstreet mempool_exit(&cc->tag_pool); 27076f1c819cSKent Overstreet 2708d00a11dfSKent Overstreet WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); 2709d00a11dfSKent Overstreet percpu_counter_destroy(&cc->n_allocated_pages); 2710d00a11dfSKent Overstreet 271128513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 271228513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 271328513fccSMilan Broz 271428513fccSMilan Broz if (cc->dev) 271528513fccSMilan Broz dm_put_device(ti, cc->dev); 271628513fccSMilan Broz 2717453431a5SWaiman Long kfree_sensitive(cc->cipher_string); 2718453431a5SWaiman Long kfree_sensitive(cc->key_string); 2719453431a5SWaiman Long kfree_sensitive(cc->cipher_auth); 2720453431a5SWaiman Long kfree_sensitive(cc->authenc_key); 272128513fccSMilan Broz 2722d5ffebddSMike Snitzer mutex_destroy(&cc->bio_alloc_lock); 2723d5ffebddSMike Snitzer 272428513fccSMilan Broz /* Must zero key material before freeing */ 2725453431a5SWaiman Long kfree_sensitive(cc); 27265059353dSMikulas Patocka 27275059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 27285059353dSMikulas Patocka WARN_ON(!dm_crypt_clients_n); 27295059353dSMikulas Patocka dm_crypt_clients_n--; 27305059353dSMikulas Patocka crypt_calculate_pages_per_client(); 27315059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 273228513fccSMilan Broz } 273328513fccSMilan Broz 2734e889f97aSMilan Broz static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 27351da177e4SLinus Torvalds { 27365ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 27371da177e4SLinus Torvalds 273833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2739e889f97aSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2740e889f97aSMilan Broz else 2741bbdb23b5SHerbert Xu cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2742e889f97aSMilan Broz 27435ebaee6dSMilan Broz if (cc->iv_size) 27445ebaee6dSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 27455ebaee6dSMilan Broz cc->iv_size = max(cc->iv_size, 27465ebaee6dSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 27475ebaee6dSMilan Broz else if (ivmode) { 27485ebaee6dSMilan Broz DMWARN("Selected cipher does not support IVs"); 27495ebaee6dSMilan Broz ivmode = NULL; 27505ebaee6dSMilan Broz } 27515ebaee6dSMilan Broz 27525ebaee6dSMilan Broz /* Choose ivmode, see comments at iv code. */ 27531da177e4SLinus Torvalds if (ivmode == NULL) 27541da177e4SLinus Torvalds cc->iv_gen_ops = NULL; 27551da177e4SLinus Torvalds else if (strcmp(ivmode, "plain") == 0) 27561da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_plain_ops; 275761afef61SMilan Broz else if (strcmp(ivmode, "plain64") == 0) 275861afef61SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 27597e3fd855SMilan Broz else if (strcmp(ivmode, "plain64be") == 0) 27607e3fd855SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64be_ops; 27611da177e4SLinus Torvalds else if (strcmp(ivmode, "essiv") == 0) 27621da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_essiv_ops; 276348527fa7SRik Snel else if (strcmp(ivmode, "benbi") == 0) 276448527fa7SRik Snel cc->iv_gen_ops = &crypt_iv_benbi_ops; 276546b47730SLudwig Nussel else if (strcmp(ivmode, "null") == 0) 276646b47730SLudwig Nussel cc->iv_gen_ops = &crypt_iv_null_ops; 2767b9411d73SMilan Broz else if (strcmp(ivmode, "eboiv") == 0) 2768b9411d73SMilan Broz cc->iv_gen_ops = &crypt_iv_eboiv_ops; 2769bbb16584SMilan Broz else if (strcmp(ivmode, "elephant") == 0) { 2770bbb16584SMilan Broz cc->iv_gen_ops = &crypt_iv_elephant_ops; 2771bbb16584SMilan Broz cc->key_parts = 2; 2772bbb16584SMilan Broz cc->key_extra_size = cc->key_size / 2; 2773bbb16584SMilan Broz if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) 2774bbb16584SMilan Broz return -EINVAL; 2775bbb16584SMilan Broz set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); 2776bbb16584SMilan Broz } else if (strcmp(ivmode, "lmk") == 0) { 277734745785SMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2778ed04d981SMilan Broz /* 2779ed04d981SMilan Broz * Version 2 and 3 is recognised according 278034745785SMilan Broz * to length of provided multi-key string. 278134745785SMilan Broz * If present (version 3), last key is used as IV seed. 2782ed04d981SMilan Broz * All keys (including IV seed) are always the same size. 278334745785SMilan Broz */ 2784da31a078SMilan Broz if (cc->key_size % cc->key_parts) { 278534745785SMilan Broz cc->key_parts++; 2786da31a078SMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2787da31a078SMilan Broz } 2788ed04d981SMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2789ed04d981SMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2790ed04d981SMilan Broz cc->key_parts += 2; /* IV + whitening */ 2791ed04d981SMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2792e889f97aSMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2793e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2794e889f97aSMilan Broz /* Need storage space in integrity fields. */ 2795e889f97aSMilan Broz cc->integrity_iv_size = cc->iv_size; 279634745785SMilan Broz } else { 279772d94861SAlasdair G Kergon ti->error = "Invalid IV mode"; 2798e889f97aSMilan Broz return -EINVAL; 27991da177e4SLinus Torvalds } 28001da177e4SLinus Torvalds 2801e889f97aSMilan Broz return 0; 2802e889f97aSMilan Broz } 2803e889f97aSMilan Broz 280433d2f09fSMilan Broz /* 280533d2f09fSMilan Broz * Workaround to parse HMAC algorithm from AEAD crypto API spec. 280633d2f09fSMilan Broz * The HMAC is needed to calculate tag size (HMAC digest size). 280733d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 280833d2f09fSMilan Broz */ 280933d2f09fSMilan Broz static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 281033d2f09fSMilan Broz { 281133d2f09fSMilan Broz char *start, *end, *mac_alg = NULL; 281233d2f09fSMilan Broz struct crypto_ahash *mac; 281333d2f09fSMilan Broz 281433d2f09fSMilan Broz if (!strstarts(cipher_api, "authenc(")) 281533d2f09fSMilan Broz return 0; 281633d2f09fSMilan Broz 281733d2f09fSMilan Broz start = strchr(cipher_api, '('); 281833d2f09fSMilan Broz end = strchr(cipher_api, ','); 281933d2f09fSMilan Broz if (!start || !end || ++start > end) 282033d2f09fSMilan Broz return -EINVAL; 282133d2f09fSMilan Broz 282233d2f09fSMilan Broz mac_alg = kzalloc(end - start + 1, GFP_KERNEL); 282333d2f09fSMilan Broz if (!mac_alg) 282433d2f09fSMilan Broz return -ENOMEM; 282533d2f09fSMilan Broz strncpy(mac_alg, start, end - start); 282633d2f09fSMilan Broz 2827cd746938SMikulas Patocka mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY); 282833d2f09fSMilan Broz kfree(mac_alg); 282933d2f09fSMilan Broz 283033d2f09fSMilan Broz if (IS_ERR(mac)) 283133d2f09fSMilan Broz return PTR_ERR(mac); 283233d2f09fSMilan Broz 283333d2f09fSMilan Broz cc->key_mac_size = crypto_ahash_digestsize(mac); 283433d2f09fSMilan Broz crypto_free_ahash(mac); 283533d2f09fSMilan Broz 283633d2f09fSMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 283733d2f09fSMilan Broz if (!cc->authenc_key) 283833d2f09fSMilan Broz return -ENOMEM; 283933d2f09fSMilan Broz 284033d2f09fSMilan Broz return 0; 284133d2f09fSMilan Broz } 284233d2f09fSMilan Broz 284333d2f09fSMilan Broz static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 284433d2f09fSMilan Broz char **ivmode, char **ivopts) 28451da177e4SLinus Torvalds { 28465ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2847a1a262b6SArd Biesheuvel char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; 284833d2f09fSMilan Broz int ret = -EINVAL; 284933d2f09fSMilan Broz 285033d2f09fSMilan Broz cc->tfms_count = 1; 285133d2f09fSMilan Broz 285233d2f09fSMilan Broz /* 285333d2f09fSMilan Broz * New format (capi: prefix) 285433d2f09fSMilan Broz * capi:cipher_api_spec-iv:ivopts 285533d2f09fSMilan Broz */ 285633d2f09fSMilan Broz tmp = &cipher_in[strlen("capi:")]; 28571856b9f7SMilan Broz 28581856b9f7SMilan Broz /* Separate IV options if present, it can contain another '-' in hash name */ 28591856b9f7SMilan Broz *ivopts = strrchr(tmp, ':'); 28601856b9f7SMilan Broz if (*ivopts) { 28611856b9f7SMilan Broz **ivopts = '\0'; 28621856b9f7SMilan Broz (*ivopts)++; 28631856b9f7SMilan Broz } 28641856b9f7SMilan Broz /* Parse IV mode */ 28651856b9f7SMilan Broz *ivmode = strrchr(tmp, '-'); 28661856b9f7SMilan Broz if (*ivmode) { 28671856b9f7SMilan Broz **ivmode = '\0'; 28681856b9f7SMilan Broz (*ivmode)++; 28691856b9f7SMilan Broz } 28701856b9f7SMilan Broz /* The rest is crypto API spec */ 28711856b9f7SMilan Broz cipher_api = tmp; 287233d2f09fSMilan Broz 2873a1a262b6SArd Biesheuvel /* Alloc AEAD, can be used only in new format. */ 2874a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) { 2875a1a262b6SArd Biesheuvel ret = crypt_ctr_auth_cipher(cc, cipher_api); 2876a1a262b6SArd Biesheuvel if (ret < 0) { 2877a1a262b6SArd Biesheuvel ti->error = "Invalid AEAD cipher spec"; 2878a1a262b6SArd Biesheuvel return -ENOMEM; 2879a1a262b6SArd Biesheuvel } 2880a1a262b6SArd Biesheuvel } 2881a1a262b6SArd Biesheuvel 288233d2f09fSMilan Broz if (*ivmode && !strcmp(*ivmode, "lmk")) 288333d2f09fSMilan Broz cc->tfms_count = 64; 288433d2f09fSMilan Broz 2885a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2886a1a262b6SArd Biesheuvel if (!*ivopts) { 2887a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2888a1a262b6SArd Biesheuvel return -EINVAL; 2889a1a262b6SArd Biesheuvel } 2890a1a262b6SArd Biesheuvel ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", 2891a1a262b6SArd Biesheuvel cipher_api, *ivopts); 2892a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 2893a1a262b6SArd Biesheuvel ti->error = "Cannot allocate cipher string"; 2894a1a262b6SArd Biesheuvel return -ENOMEM; 2895a1a262b6SArd Biesheuvel } 2896a1a262b6SArd Biesheuvel cipher_api = buf; 2897a1a262b6SArd Biesheuvel } 2898a1a262b6SArd Biesheuvel 289933d2f09fSMilan Broz cc->key_parts = cc->tfms_count; 290033d2f09fSMilan Broz 290133d2f09fSMilan Broz /* Allocate cipher */ 290233d2f09fSMilan Broz ret = crypt_alloc_tfms(cc, cipher_api); 290333d2f09fSMilan Broz if (ret < 0) { 290433d2f09fSMilan Broz ti->error = "Error allocating crypto tfm"; 290533d2f09fSMilan Broz return ret; 290633d2f09fSMilan Broz } 290733d2f09fSMilan Broz 2908a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) 290933d2f09fSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2910a1a262b6SArd Biesheuvel else 291133d2f09fSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 291233d2f09fSMilan Broz 291333d2f09fSMilan Broz return 0; 291433d2f09fSMilan Broz } 291533d2f09fSMilan Broz 291633d2f09fSMilan Broz static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 291733d2f09fSMilan Broz char **ivmode, char **ivopts) 291833d2f09fSMilan Broz { 291933d2f09fSMilan Broz struct crypt_config *cc = ti->private; 292033d2f09fSMilan Broz char *tmp, *cipher, *chainmode, *keycount; 29215ebaee6dSMilan Broz char *cipher_api = NULL; 29225ebaee6dSMilan Broz int ret = -EINVAL; 29235ebaee6dSMilan Broz char dummy; 29245ebaee6dSMilan Broz 292533d2f09fSMilan Broz if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 29265ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 29275ebaee6dSMilan Broz return -EINVAL; 29285ebaee6dSMilan Broz } 29295ebaee6dSMilan Broz 29301da177e4SLinus Torvalds /* 29315ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 29325ebaee6dSMilan Broz * cipher[:keycount]-mode-iv:ivopts 29335ebaee6dSMilan Broz */ 29345ebaee6dSMilan Broz tmp = cipher_in; 29355ebaee6dSMilan Broz keycount = strsep(&tmp, "-"); 29365ebaee6dSMilan Broz cipher = strsep(&keycount, ":"); 29375ebaee6dSMilan Broz 293869a8cfcdSMilan Broz if (!keycount) 29395ebaee6dSMilan Broz cc->tfms_count = 1; 29405ebaee6dSMilan Broz else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 29415ebaee6dSMilan Broz !is_power_of_2(cc->tfms_count)) { 29425ebaee6dSMilan Broz ti->error = "Bad cipher key count specification"; 29435ebaee6dSMilan Broz return -EINVAL; 29445ebaee6dSMilan Broz } 294528513fccSMilan Broz cc->key_parts = cc->tfms_count; 29461da177e4SLinus Torvalds 2947ddd42edfSMilan Broz chainmode = strsep(&tmp, "-"); 29481856b9f7SMilan Broz *ivmode = strsep(&tmp, ":"); 29491856b9f7SMilan Broz *ivopts = tmp; 2950ddd42edfSMilan Broz 2951ddd42edfSMilan Broz /* 2952ddd42edfSMilan Broz * For compatibility with the original dm-crypt mapping format, if 2953ddd42edfSMilan Broz * only the cipher name is supplied, use cbc-plain. 295428513fccSMilan Broz */ 295533d2f09fSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 2956cabf08e4SMilan Broz chainmode = "cbc"; 295733d2f09fSMilan Broz *ivmode = "plain"; 2958cabf08e4SMilan Broz } 2959cabf08e4SMilan Broz 296033d2f09fSMilan Broz if (strcmp(chainmode, "ecb") && !*ivmode) { 2961c0297721SAndi Kleen ti->error = "IV mechanism required"; 2962c0297721SAndi Kleen return -EINVAL; 2963c0297721SAndi Kleen } 2964c0297721SAndi Kleen 2965cabf08e4SMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 29669934a8beSMilan Broz if (!cipher_api) 296728513fccSMilan Broz goto bad_mem; 29689934a8beSMilan Broz 2969a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2970a1a262b6SArd Biesheuvel if (!*ivopts) { 2971a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2972a1a262b6SArd Biesheuvel kfree(cipher_api); 2973a1a262b6SArd Biesheuvel return -EINVAL; 2974a1a262b6SArd Biesheuvel } 2975a1a262b6SArd Biesheuvel ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2976a1a262b6SArd Biesheuvel "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); 2977a1a262b6SArd Biesheuvel } else { 29789934a8beSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2979647c7db1SMikulas Patocka "%s(%s)", chainmode, cipher); 2980a1a262b6SArd Biesheuvel } 2981a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 29821da177e4SLinus Torvalds kfree(cipher_api); 298328513fccSMilan Broz goto bad_mem; 298428513fccSMilan Broz } 298528513fccSMilan Broz 29861da177e4SLinus Torvalds /* Allocate cipher */ 29871da177e4SLinus Torvalds ret = crypt_alloc_tfms(cc, cipher_api); 29881da177e4SLinus Torvalds if (ret < 0) { 29891da177e4SLinus Torvalds ti->error = "Error allocating crypto tfm"; 299033d2f09fSMilan Broz kfree(cipher_api); 299133d2f09fSMilan Broz return ret; 2992028867acSAlasdair G Kergon } 2993bd86e320SJeffy Chen kfree(cipher_api); 2994647c7db1SMikulas Patocka 299533d2f09fSMilan Broz return 0; 299633d2f09fSMilan Broz bad_mem: 299733d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 299833d2f09fSMilan Broz return -ENOMEM; 299933d2f09fSMilan Broz } 300033d2f09fSMilan Broz 300133d2f09fSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 300233d2f09fSMilan Broz { 300333d2f09fSMilan Broz struct crypt_config *cc = ti->private; 300433d2f09fSMilan Broz char *ivmode = NULL, *ivopts = NULL; 300533d2f09fSMilan Broz int ret; 300633d2f09fSMilan Broz 300733d2f09fSMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 300833d2f09fSMilan Broz if (!cc->cipher_string) { 300933d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 301033d2f09fSMilan Broz return -ENOMEM; 301133d2f09fSMilan Broz } 301233d2f09fSMilan Broz 301333d2f09fSMilan Broz if (strstarts(cipher_in, "capi:")) 301433d2f09fSMilan Broz ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 301533d2f09fSMilan Broz else 301633d2f09fSMilan Broz ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 301733d2f09fSMilan Broz if (ret) 301833d2f09fSMilan Broz return ret; 301933d2f09fSMilan Broz 3020647c7db1SMikulas Patocka /* Initialize IV */ 3021e889f97aSMilan Broz ret = crypt_ctr_ivmode(ti, ivmode); 3022e889f97aSMilan Broz if (ret < 0) 302333d2f09fSMilan Broz return ret; 30241da177e4SLinus Torvalds 3025da31a078SMilan Broz /* Initialize and set key */ 3026da31a078SMilan Broz ret = crypt_set_key(cc, key); 3027da31a078SMilan Broz if (ret < 0) { 3028da31a078SMilan Broz ti->error = "Error decoding and setting key"; 302933d2f09fSMilan Broz return ret; 3030da31a078SMilan Broz } 3031da31a078SMilan Broz 30321da177e4SLinus Torvalds /* Allocate IV */ 30331da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 30341da177e4SLinus Torvalds ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 30351da177e4SLinus Torvalds if (ret < 0) { 30361da177e4SLinus Torvalds ti->error = "Error creating IV"; 303733d2f09fSMilan Broz return ret; 30381da177e4SLinus Torvalds } 30391da177e4SLinus Torvalds } 30401da177e4SLinus Torvalds 30411da177e4SLinus Torvalds /* Initialize IV (set keys for ESSIV etc) */ 30421da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 30431da177e4SLinus Torvalds ret = cc->iv_gen_ops->init(cc); 30441da177e4SLinus Torvalds if (ret < 0) { 30451da177e4SLinus Torvalds ti->error = "Error initialising IV"; 30461da177e4SLinus Torvalds return ret; 30471da177e4SLinus Torvalds } 30481da177e4SLinus Torvalds } 30491da177e4SLinus Torvalds 3050dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 3051dc94902bSOndrej Kozina if (cc->key_string) 3052dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 3053dc94902bSOndrej Kozina 305433d2f09fSMilan Broz return ret; 30551da177e4SLinus Torvalds } 30561da177e4SLinus Torvalds 3057ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 3058ef43aa38SMilan Broz { 3059ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 3060ef43aa38SMilan Broz struct dm_arg_set as; 30615916a22bSEric Biggers static const struct dm_arg _args[] = { 306239d42fa9SIgnat Korchagin {0, 8, "Invalid number of feature args"}, 3063ef43aa38SMilan Broz }; 3064ef43aa38SMilan Broz unsigned int opt_params, val; 3065ef43aa38SMilan Broz const char *opt_string, *sval; 30668f0009a2SMilan Broz char dummy; 3067ef43aa38SMilan Broz int ret; 3068ef43aa38SMilan Broz 3069ef43aa38SMilan Broz /* Optional parameters */ 3070ef43aa38SMilan Broz as.argc = argc; 3071ef43aa38SMilan Broz as.argv = argv; 3072ef43aa38SMilan Broz 3073ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 3074ef43aa38SMilan Broz if (ret) 30751da177e4SLinus Torvalds return ret; 30761da177e4SLinus Torvalds 3077ef43aa38SMilan Broz while (opt_params--) { 3078ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 3079ef43aa38SMilan Broz if (!opt_string) { 3080ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 3081ef43aa38SMilan Broz return -EINVAL; 3082ef43aa38SMilan Broz } 3083ef43aa38SMilan Broz 3084ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 3085ef43aa38SMilan Broz ti->num_discard_bios = 1; 3086ef43aa38SMilan Broz 3087ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 3088ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3089ef43aa38SMilan Broz 3090ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 3091ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 309239d42fa9SIgnat Korchagin else if (!strcasecmp(opt_string, "no_read_workqueue")) 309339d42fa9SIgnat Korchagin set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 309439d42fa9SIgnat Korchagin else if (!strcasecmp(opt_string, "no_write_workqueue")) 309539d42fa9SIgnat Korchagin set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3096ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 3097ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 3098ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 3099ef43aa38SMilan Broz return -EINVAL; 3100ef43aa38SMilan Broz } 3101ef43aa38SMilan Broz cc->on_disk_tag_size = val; 3102ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 3103ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 3104ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 3105ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 3106ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 3107ef43aa38SMilan Broz return -EINVAL; 3108ef43aa38SMilan Broz } 3109ef43aa38SMilan Broz 3110ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 3111ef43aa38SMilan Broz if (!cc->cipher_auth) 31121da177e4SLinus Torvalds return -ENOMEM; 3113ff3af92bSMikulas Patocka } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { 31148f0009a2SMilan Broz if (cc->sector_size < (1 << SECTOR_SHIFT) || 31158f0009a2SMilan Broz cc->sector_size > 4096 || 3116ff3af92bSMikulas Patocka (cc->sector_size & (cc->sector_size - 1))) { 31178f0009a2SMilan Broz ti->error = "Invalid feature value for sector_size"; 31188f0009a2SMilan Broz return -EINVAL; 31198f0009a2SMilan Broz } 3120783874b0SMilan Broz if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { 3121783874b0SMilan Broz ti->error = "Device size is not multiple of sector_size feature"; 3122783874b0SMilan Broz return -EINVAL; 3123783874b0SMilan Broz } 3124ff3af92bSMikulas Patocka cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 31258f0009a2SMilan Broz } else if (!strcasecmp(opt_string, "iv_large_sectors")) 31268f0009a2SMilan Broz set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 31278f0009a2SMilan Broz else { 3128ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 3129ef43aa38SMilan Broz return -EINVAL; 3130ef43aa38SMilan Broz } 3131ef43aa38SMilan Broz } 3132ef43aa38SMilan Broz 3133ef43aa38SMilan Broz return 0; 31341da177e4SLinus Torvalds } 31351da177e4SLinus Torvalds 31368e225f04SDamien Le Moal #ifdef CONFIG_BLK_DEV_ZONED 31378e225f04SDamien Le Moal static int crypt_report_zones(struct dm_target *ti, 31388e225f04SDamien Le Moal struct dm_report_zones_args *args, unsigned int nr_zones) 31398e225f04SDamien Le Moal { 31408e225f04SDamien Le Moal struct crypt_config *cc = ti->private; 31418e225f04SDamien Le Moal sector_t sector = cc->start + dm_target_offset(ti, args->next_sector); 31428e225f04SDamien Le Moal 31438e225f04SDamien Le Moal args->start = cc->start; 31448e225f04SDamien Le Moal return blkdev_report_zones(cc->dev->bdev, sector, nr_zones, 31458e225f04SDamien Le Moal dm_report_zones_cb, args); 31468e225f04SDamien Le Moal } 3147*e3290b94SMike Snitzer #else 3148*e3290b94SMike Snitzer #define crypt_report_zones NULL 31498e225f04SDamien Le Moal #endif 31508e225f04SDamien Le Moal 31511da177e4SLinus Torvalds /* 31521da177e4SLinus Torvalds * Construct an encryption mapping: 3153c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 31541da177e4SLinus Torvalds */ 31551da177e4SLinus Torvalds static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 31561da177e4SLinus Torvalds { 31571da177e4SLinus Torvalds struct crypt_config *cc; 3158ed0302e8SMichał Mirosław const char *devname = dm_table_device_name(ti->table); 3159c538f6ecSOndrej Kozina int key_size; 3160ef43aa38SMilan Broz unsigned int align_mask; 31611da177e4SLinus Torvalds unsigned long long tmpll; 31621da177e4SLinus Torvalds int ret; 3163ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 316431998ef1SMikulas Patocka char dummy; 31651da177e4SLinus Torvalds 3166772ae5f5SMilan Broz if (argc < 5) { 31671da177e4SLinus Torvalds ti->error = "Not enough arguments"; 31681da177e4SLinus Torvalds return -EINVAL; 31691da177e4SLinus Torvalds } 31701da177e4SLinus Torvalds 3171c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 3172c538f6ecSOndrej Kozina if (key_size < 0) { 3173c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 3174c538f6ecSOndrej Kozina return -EINVAL; 3175c538f6ecSOndrej Kozina } 31761da177e4SLinus Torvalds 31779c81c99bSZhengyuan Liu cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL); 31781da177e4SLinus Torvalds if (!cc) { 31791da177e4SLinus Torvalds ti->error = "Cannot allocate encryption context"; 31801da177e4SLinus Torvalds return -ENOMEM; 31811da177e4SLinus Torvalds } 31821da177e4SLinus Torvalds cc->key_size = key_size; 31838f0009a2SMilan Broz cc->sector_size = (1 << SECTOR_SHIFT); 3184ff3af92bSMikulas Patocka cc->sector_shift = 0; 31851da177e4SLinus Torvalds 31861da177e4SLinus Torvalds ti->private = cc; 3187ef43aa38SMilan Broz 31885059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 31895059353dSMikulas Patocka dm_crypt_clients_n++; 31905059353dSMikulas Patocka crypt_calculate_pages_per_client(); 31915059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 31925059353dSMikulas Patocka 31935059353dSMikulas Patocka ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); 31945059353dSMikulas Patocka if (ret < 0) 31955059353dSMikulas Patocka goto bad; 31965059353dSMikulas Patocka 3197ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 3198ef43aa38SMilan Broz if (argc > 5) { 3199ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 3200ef43aa38SMilan Broz if (ret) 3201ef43aa38SMilan Broz goto bad; 3202ef43aa38SMilan Broz } 3203ef43aa38SMilan Broz 32041da177e4SLinus Torvalds ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 32051da177e4SLinus Torvalds if (ret < 0) 32061da177e4SLinus Torvalds goto bad; 32071da177e4SLinus Torvalds 320833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 3209ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 3210ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 3211ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 3212ef43aa38SMilan Broz } else { 3213bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 3214bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 3215ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 3216ef43aa38SMilan Broz } 3217d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 3218d49ec52fSMikulas Patocka 3219ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 3220d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 3221d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 3222ef43aa38SMilan Broz & align_mask; 3223d49ec52fSMikulas Patocka } else { 3224d49ec52fSMikulas Patocka /* 3225d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 3226d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 3227d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 3228d49ec52fSMikulas Patocka */ 3229ef43aa38SMilan Broz iv_size_padding = align_mask; 3230d49ec52fSMikulas Patocka } 32311da177e4SLinus Torvalds 3232ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 3233ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 3234ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 3235ef43aa38SMilan Broz cc->iv_size + 3236ef43aa38SMilan Broz sizeof(uint64_t) + 3237ef43aa38SMilan Broz sizeof(unsigned int); 3238ef43aa38SMilan Broz 32396f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); 32406f1c819cSKent Overstreet if (ret) { 32411da177e4SLinus Torvalds ti->error = "Cannot allocate crypt request mempool"; 32421da177e4SLinus Torvalds goto bad; 32431da177e4SLinus Torvalds } 32441da177e4SLinus Torvalds 324530187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 3246ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 3247d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 3248298a9fa0SMikulas Patocka 32496f1c819cSKent Overstreet ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc); 32506f1c819cSKent Overstreet if (ret) { 32518b004457SMilan Broz ti->error = "Cannot allocate page mempool"; 3252e48d4bbfSMilan Broz goto bad; 32531da177e4SLinus Torvalds } 3254e48d4bbfSMilan Broz 32556f1c819cSKent Overstreet ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); 32566f1c819cSKent Overstreet if (ret) { 32570c395b0fSMilan Broz ti->error = "Cannot allocate crypt bioset"; 3258cabf08e4SMilan Broz goto bad; 325993e605c2SMilan Broz } 3260cabf08e4SMilan Broz 32617145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 32627145c241SMikulas Patocka 3263cabf08e4SMilan Broz ret = -EINVAL; 32648f0009a2SMilan Broz if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 32658f0009a2SMilan Broz (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 3266cabf08e4SMilan Broz ti->error = "Invalid iv_offset sector"; 3267cabf08e4SMilan Broz goto bad; 32681da177e4SLinus Torvalds } 3269d2a7ad29SKiyoshi Ueda cc->iv_offset = tmpll; 32701da177e4SLinus Torvalds 3271e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 3272e80d1c80SVivek Goyal if (ret) { 32731da177e4SLinus Torvalds ti->error = "Device lookup failed"; 32741da177e4SLinus Torvalds goto bad; 32751da177e4SLinus Torvalds } 32761da177e4SLinus Torvalds 3277e80d1c80SVivek Goyal ret = -EINVAL; 3278ef87bfc2SMilan Broz if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { 32791da177e4SLinus Torvalds ti->error = "Invalid device sector"; 32801da177e4SLinus Torvalds goto bad; 32811da177e4SLinus Torvalds } 32821da177e4SLinus Torvalds cc->start = tmpll; 32831da177e4SLinus Torvalds 32848e225f04SDamien Le Moal /* 32858e225f04SDamien Le Moal * For zoned block devices, we need to preserve the issuer write 32868e225f04SDamien Le Moal * ordering. To do so, disable write workqueues and force inline 32878e225f04SDamien Le Moal * encryption completion. 32888e225f04SDamien Le Moal */ 32898e225f04SDamien Le Moal if (bdev_is_zoned(cc->dev->bdev)) { 32908e225f04SDamien Le Moal set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 32918e225f04SDamien Le Moal set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); 32928e225f04SDamien Le Moal } 32938e225f04SDamien Le Moal 329433d2f09fSMilan Broz if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 3295ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 3296772ae5f5SMilan Broz if (ret) 3297772ae5f5SMilan Broz goto bad; 3298772ae5f5SMilan Broz 3299ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 3300ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 3301ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 3302ef43aa38SMilan Broz 33036f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, 3304ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 33056f1c819cSKent Overstreet if (ret) { 3306ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 3307f3396c58SMikulas Patocka goto bad; 3308f3396c58SMikulas Patocka } 3309772ae5f5SMilan Broz 3310583fe747SMikulas Patocka cc->tag_pool_max_sectors <<= cc->sector_shift; 3311f3396c58SMikulas Patocka } 3312772ae5f5SMilan Broz 33131da177e4SLinus Torvalds ret = -ENOMEM; 3314f612b213SMike Snitzer cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname); 33151da177e4SLinus Torvalds if (!cc->io_queue) { 33161da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd io queue"; 33171da177e4SLinus Torvalds goto bad; 33181da177e4SLinus Torvalds } 331937af6560SChristophe Saout 3320f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 332148b0777cSMike Snitzer cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 3322ed0302e8SMichał Mirosław 1, devname); 3323f3396c58SMikulas Patocka else 332448b0777cSMike Snitzer cc->crypt_queue = alloc_workqueue("kcryptd/%s", 332548b0777cSMike Snitzer WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 3326ed0302e8SMichał Mirosław num_online_cpus(), devname); 33271da177e4SLinus Torvalds if (!cc->crypt_queue) { 33281da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd queue"; 33291da177e4SLinus Torvalds goto bad; 33301da177e4SLinus Torvalds } 33311da177e4SLinus Torvalds 3332c7329effSMikulas Patocka spin_lock_init(&cc->write_thread_lock); 3333b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 3334dc267621SMikulas Patocka 3335ed0302e8SMichał Mirosław cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname); 3336dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 3337dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 3338dc267621SMikulas Patocka cc->write_thread = NULL; 3339dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 3340dc267621SMikulas Patocka goto bad; 3341dc267621SMikulas Patocka } 3342dc267621SMikulas Patocka wake_up_process(cc->write_thread); 3343dc267621SMikulas Patocka 334455a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 3345983c7db3SMilan Broz 33461da177e4SLinus Torvalds return 0; 33471da177e4SLinus Torvalds 33481da177e4SLinus Torvalds bad: 33491da177e4SLinus Torvalds crypt_dtr(ti); 33501da177e4SLinus Torvalds return ret; 3351647c7db1SMikulas Patocka } 3352647c7db1SMikulas Patocka 33537de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 33541da177e4SLinus Torvalds { 33551da177e4SLinus Torvalds struct dm_crypt_io *io; 335649a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 3357647c7db1SMikulas Patocka 3358772ae5f5SMilan Broz /* 335928a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 336028a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 3361e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 3362772ae5f5SMilan Broz */ 33631eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 336428a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 336574d46992SChristoph Hellwig bio_set_dev(bio, cc->dev->bdev); 3366772ae5f5SMilan Broz if (bio_sectors(bio)) 33674f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 33684f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 3369647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 3370647c7db1SMikulas Patocka } 33711da177e4SLinus Torvalds 33724e870e94SMikulas Patocka /* 33734e870e94SMikulas Patocka * Check if bio is too large, split as needed. 33744e870e94SMikulas Patocka */ 33754e870e94SMikulas Patocka if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && 3376ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 33774e870e94SMikulas Patocka dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); 33784e870e94SMikulas Patocka 33798f0009a2SMilan Broz /* 33808f0009a2SMilan Broz * Ensure that bio is a multiple of internal sector encryption size 33818f0009a2SMilan Broz * and is aligned to this size as defined in IO hints. 33828f0009a2SMilan Broz */ 33838f0009a2SMilan Broz if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 3384846785e6SChristoph Hellwig return DM_MAPIO_KILL; 33858f0009a2SMilan Broz 33868f0009a2SMilan Broz if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 3387846785e6SChristoph Hellwig return DM_MAPIO_KILL; 33888f0009a2SMilan Broz 3389298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 3390298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 3391ef43aa38SMilan Broz 3392ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 3393583fe747SMikulas Patocka unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); 3394ef43aa38SMilan Broz 3395ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 3396583fe747SMikulas Patocka unlikely(!(io->integrity_metadata = kmalloc(tag_len, 3397ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 3398ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 3399ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 34006f1c819cSKent Overstreet io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); 3401ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 3402ef43aa38SMilan Broz } 3403ef43aa38SMilan Broz } 3404ef43aa38SMilan Broz 340533d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 3406ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 3407ef43aa38SMilan Broz else 3408ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 34091da177e4SLinus Torvalds 341020c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 341120c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 3412dc267621SMikulas Patocka kcryptd_queue_read(io); 341320c82538SMilan Broz } else 34144ee218cdSAndrew Morton kcryptd_queue_crypt(io); 34154ee218cdSAndrew Morton 34161da177e4SLinus Torvalds return DM_MAPIO_SUBMITTED; 34171da177e4SLinus Torvalds } 34181da177e4SLinus Torvalds 3419fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 34201f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 34211da177e4SLinus Torvalds { 34225ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 3423fd7c092eSMikulas Patocka unsigned i, sz = 0; 3424f3396c58SMikulas Patocka int num_feature_args = 0; 34251da177e4SLinus Torvalds 34261da177e4SLinus Torvalds switch (type) { 34271da177e4SLinus Torvalds case STATUSTYPE_INFO: 34281da177e4SLinus Torvalds result[0] = '\0'; 34291da177e4SLinus Torvalds break; 34301da177e4SLinus Torvalds 34311da177e4SLinus Torvalds case STATUSTYPE_TABLE: 34327dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 34331da177e4SLinus Torvalds 3434c538f6ecSOndrej Kozina if (cc->key_size > 0) { 3435c538f6ecSOndrej Kozina if (cc->key_string) 3436c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 3437c538f6ecSOndrej Kozina else 3438fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 3439fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 3440c538f6ecSOndrej Kozina } else 3441fd7c092eSMikulas Patocka DMEMIT("-"); 34421da177e4SLinus Torvalds 34431da177e4SLinus Torvalds DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 34441da177e4SLinus Torvalds cc->dev->name, (unsigned long long)cc->start); 3445772ae5f5SMilan Broz 3446f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 3447f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 34480f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 344939d42fa9SIgnat Korchagin num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 345039d42fa9SIgnat Korchagin num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3451ff3af92bSMikulas Patocka num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 34528f0009a2SMilan Broz num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3453ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3454ef43aa38SMilan Broz num_feature_args++; 3455f3396c58SMikulas Patocka if (num_feature_args) { 3456f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 345755a62eefSAlasdair G Kergon if (ti->num_discard_bios) 3458f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 3459f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3460f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 34610f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 34620f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 346339d42fa9SIgnat Korchagin if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) 346439d42fa9SIgnat Korchagin DMEMIT(" no_read_workqueue"); 346539d42fa9SIgnat Korchagin if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) 346639d42fa9SIgnat Korchagin DMEMIT(" no_write_workqueue"); 3467ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3468ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 34698f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) 34708f0009a2SMilan Broz DMEMIT(" sector_size:%d", cc->sector_size); 34718f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 34728f0009a2SMilan Broz DMEMIT(" iv_large_sectors"); 3473f3396c58SMikulas Patocka } 3474772ae5f5SMilan Broz 34751da177e4SLinus Torvalds break; 34761da177e4SLinus Torvalds } 34771da177e4SLinus Torvalds } 34781da177e4SLinus Torvalds 3479e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 3480e48d4bbfSMilan Broz { 3481e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3482e48d4bbfSMilan Broz 3483e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3484e48d4bbfSMilan Broz } 3485e48d4bbfSMilan Broz 3486e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 3487e48d4bbfSMilan Broz { 3488e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3489e48d4bbfSMilan Broz 3490e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 3491e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 3492e48d4bbfSMilan Broz return -EAGAIN; 3493e48d4bbfSMilan Broz } 3494e48d4bbfSMilan Broz 3495e48d4bbfSMilan Broz return 0; 3496e48d4bbfSMilan Broz } 3497e48d4bbfSMilan Broz 3498e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 3499e48d4bbfSMilan Broz { 3500e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3501e48d4bbfSMilan Broz 3502e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3503e48d4bbfSMilan Broz } 3504e48d4bbfSMilan Broz 3505e48d4bbfSMilan Broz /* Message interface 3506e48d4bbfSMilan Broz * key set <key> 3507e48d4bbfSMilan Broz * key wipe 3508e48d4bbfSMilan Broz */ 35091eb5fa84SMike Snitzer static int crypt_message(struct dm_target *ti, unsigned argc, char **argv, 35101eb5fa84SMike Snitzer char *result, unsigned maxlen) 3511e48d4bbfSMilan Broz { 3512e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3513c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 3514e48d4bbfSMilan Broz 3515e48d4bbfSMilan Broz if (argc < 2) 3516e48d4bbfSMilan Broz goto error; 3517e48d4bbfSMilan Broz 3518498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 3519e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 3520e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 3521e48d4bbfSMilan Broz return -EINVAL; 3522e48d4bbfSMilan Broz } 3523498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 3524c538f6ecSOndrej Kozina /* The key size may not be changed. */ 3525c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 3526c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 3527c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 3528c538f6ecSOndrej Kozina return -EINVAL; 3529c538f6ecSOndrej Kozina } 3530c538f6ecSOndrej Kozina 3531542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 3532542da317SMilan Broz if (ret) 3533542da317SMilan Broz return ret; 3534542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 3535542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 3536dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 3537dc94902bSOndrej Kozina if (cc->key_string) 3538dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 3539542da317SMilan Broz return ret; 3540542da317SMilan Broz } 35414a52ffc7SMilan Broz if (argc == 2 && !strcasecmp(argv[1], "wipe")) 3542e48d4bbfSMilan Broz return crypt_wipe_key(cc); 3543e48d4bbfSMilan Broz } 3544e48d4bbfSMilan Broz 3545e48d4bbfSMilan Broz error: 3546e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 3547e48d4bbfSMilan Broz return -EINVAL; 3548e48d4bbfSMilan Broz } 3549e48d4bbfSMilan Broz 3550af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 3551af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 3552af4874e0SMike Snitzer { 3553af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 3554af4874e0SMike Snitzer 35555dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 3556af4874e0SMike Snitzer } 3557af4874e0SMike Snitzer 3558586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 3559586b286bSMike Snitzer { 35608f0009a2SMilan Broz struct crypt_config *cc = ti->private; 35618f0009a2SMilan Broz 3562586b286bSMike Snitzer /* 3563586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 3564586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 3565586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 3566586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 3567586b286bSMike Snitzer */ 3568586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 35698f0009a2SMilan Broz 3570bc9e9cf0SMikulas Patocka limits->logical_block_size = 357164611a15SEric Biggers max_t(unsigned, limits->logical_block_size, cc->sector_size); 3572bc9e9cf0SMikulas Patocka limits->physical_block_size = 3573bc9e9cf0SMikulas Patocka max_t(unsigned, limits->physical_block_size, cc->sector_size); 3574bc9e9cf0SMikulas Patocka limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size); 3575586b286bSMike Snitzer } 3576586b286bSMike Snitzer 35771da177e4SLinus Torvalds static struct target_type crypt_target = { 35781da177e4SLinus Torvalds .name = "crypt", 3579363880c4SAhmad Fatoum .version = {1, 23, 0}, 35801da177e4SLinus Torvalds .module = THIS_MODULE, 35811da177e4SLinus Torvalds .ctr = crypt_ctr, 35821da177e4SLinus Torvalds .dtr = crypt_dtr, 35838e225f04SDamien Le Moal .features = DM_TARGET_ZONED_HM, 35848e225f04SDamien Le Moal .report_zones = crypt_report_zones, 35851da177e4SLinus Torvalds .map = crypt_map, 35861da177e4SLinus Torvalds .status = crypt_status, 3587e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 3588e48d4bbfSMilan Broz .preresume = crypt_preresume, 3589e48d4bbfSMilan Broz .resume = crypt_resume, 3590e48d4bbfSMilan Broz .message = crypt_message, 3591af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 3592586b286bSMike Snitzer .io_hints = crypt_io_hints, 35931da177e4SLinus Torvalds }; 35941da177e4SLinus Torvalds 35951da177e4SLinus Torvalds static int __init dm_crypt_init(void) 35961da177e4SLinus Torvalds { 35971da177e4SLinus Torvalds int r; 35981da177e4SLinus Torvalds 35991da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 360094f5e024SMikulas Patocka if (r < 0) 360172d94861SAlasdair G Kergon DMERR("register failed %d", r); 36021da177e4SLinus Torvalds 36031da177e4SLinus Torvalds return r; 36041da177e4SLinus Torvalds } 36051da177e4SLinus Torvalds 36061da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 36071da177e4SLinus Torvalds { 360810d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 36091da177e4SLinus Torvalds } 36101da177e4SLinus Torvalds 36111da177e4SLinus Torvalds module_init(dm_crypt_init); 36121da177e4SLinus Torvalds module_exit(dm_crypt_exit); 36131da177e4SLinus Torvalds 3614bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 36151da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 36161da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 3617