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 4458d0f180SMichael Weiß #include "dm-audit.h" 4558d0f180SMichael Weiß 4672d94861SAlasdair G Kergon #define DM_MSG_PREFIX "crypt" 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* 491da177e4SLinus Torvalds * context holding the current state of a multi-part conversion 501da177e4SLinus Torvalds */ 511da177e4SLinus Torvalds struct convert_context { 5243d69034SMilan Broz struct completion restart; 531da177e4SLinus Torvalds struct bio *bio_in; 541da177e4SLinus Torvalds struct bio *bio_out; 55003b5c57SKent Overstreet struct bvec_iter iter_in; 56003b5c57SKent Overstreet struct bvec_iter iter_out; 578d683dcdSAliOS system security u64 cc_sector; 5840b6229bSMikulas Patocka atomic_t cc_pending; 59ef43aa38SMilan Broz union { 60bbdb23b5SHerbert Xu struct skcipher_request *req; 61ef43aa38SMilan Broz struct aead_request *req_aead; 62ef43aa38SMilan Broz } r; 63ef43aa38SMilan Broz 641da177e4SLinus Torvalds }; 651da177e4SLinus Torvalds 6653017030SMilan Broz /* 6753017030SMilan Broz * per bio private data 6853017030SMilan Broz */ 6953017030SMilan Broz struct dm_crypt_io { 7049a8a920SAlasdair G Kergon struct crypt_config *cc; 7153017030SMilan Broz struct bio *base_bio; 72ef43aa38SMilan Broz u8 *integrity_metadata; 73ef43aa38SMilan Broz bool integrity_metadata_from_pool; 7453017030SMilan Broz struct work_struct work; 7539d42fa9SIgnat Korchagin struct tasklet_struct tasklet; 7653017030SMilan Broz 7753017030SMilan Broz struct convert_context ctx; 7853017030SMilan Broz 7940b6229bSMikulas Patocka atomic_t io_pending; 804e4cbee9SChristoph Hellwig blk_status_t error; 810c395b0fSMilan Broz sector_t sector; 82dc267621SMikulas Patocka 83b3c5fd30SMikulas Patocka struct rb_node rb_node; 84298a9fa0SMikulas Patocka } CRYPTO_MINALIGN_ATTR; 8553017030SMilan Broz 8601482b76SMilan Broz struct dm_crypt_request { 87b2174eebSHuang Ying struct convert_context *ctx; 88ef43aa38SMilan Broz struct scatterlist sg_in[4]; 89ef43aa38SMilan Broz struct scatterlist sg_out[4]; 908d683dcdSAliOS system security u64 iv_sector; 9101482b76SMilan Broz }; 9201482b76SMilan Broz 931da177e4SLinus Torvalds struct crypt_config; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds struct crypt_iv_operations { 961da177e4SLinus Torvalds int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 971da177e4SLinus Torvalds const char *opts); 981da177e4SLinus Torvalds void (*dtr)(struct crypt_config *cc); 99b95bf2d3SMilan Broz int (*init)(struct crypt_config *cc); 100542da317SMilan Broz int (*wipe)(struct crypt_config *cc); 1012dc5327dSMilan Broz int (*generator)(struct crypt_config *cc, u8 *iv, 1022dc5327dSMilan Broz struct dm_crypt_request *dmreq); 1032dc5327dSMilan Broz int (*post)(struct crypt_config *cc, u8 *iv, 1042dc5327dSMilan Broz struct dm_crypt_request *dmreq); 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 10760473592SMilan Broz struct iv_benbi_private { 10860473592SMilan Broz int shift; 10960473592SMilan Broz }; 11060473592SMilan Broz 11134745785SMilan Broz #define LMK_SEED_SIZE 64 /* hash + 0 */ 11234745785SMilan Broz struct iv_lmk_private { 11334745785SMilan Broz struct crypto_shash *hash_tfm; 11434745785SMilan Broz u8 *seed; 11534745785SMilan Broz }; 11634745785SMilan Broz 117ed04d981SMilan Broz #define TCW_WHITENING_SIZE 16 118ed04d981SMilan Broz struct iv_tcw_private { 119ed04d981SMilan Broz struct crypto_shash *crc32_tfm; 120ed04d981SMilan Broz u8 *iv_seed; 121ed04d981SMilan Broz u8 *whitening; 122ed04d981SMilan Broz }; 123ed04d981SMilan Broz 124bbb16584SMilan Broz #define ELEPHANT_MAX_KEY_SIZE 32 125bbb16584SMilan Broz struct iv_elephant_private { 126bbb16584SMilan Broz struct crypto_skcipher *tfm; 127bbb16584SMilan Broz }; 128bbb16584SMilan Broz 1291da177e4SLinus Torvalds /* 1301da177e4SLinus Torvalds * Crypt: maps a linear range of a block device 1311da177e4SLinus Torvalds * and encrypts / decrypts at the same time. 1321da177e4SLinus Torvalds */ 1330f5d8e6eSMikulas Patocka enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 13439d42fa9SIgnat Korchagin DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD, 1358e225f04SDamien Le Moal DM_CRYPT_NO_READ_WORKQUEUE, DM_CRYPT_NO_WRITE_WORKQUEUE, 1368e225f04SDamien Le Moal DM_CRYPT_WRITE_INLINE }; 137c0297721SAndi Kleen 138ef43aa38SMilan Broz enum cipher_flags { 13974d1da39SGeert Uytterhoeven CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ 1408f0009a2SMilan Broz CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 141bbb16584SMilan Broz CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ 142ef43aa38SMilan Broz }; 143ef43aa38SMilan Broz 144c0297721SAndi Kleen /* 145610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 146c0297721SAndi Kleen */ 1471da177e4SLinus Torvalds struct crypt_config { 1481da177e4SLinus Torvalds struct dm_dev *dev; 1491da177e4SLinus Torvalds sector_t start; 1501da177e4SLinus Torvalds 1515059353dSMikulas Patocka struct percpu_counter n_allocated_pages; 1525059353dSMikulas Patocka 153cabf08e4SMilan Broz struct workqueue_struct *io_queue; 154cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1553f1e9070SMilan Broz 156c7329effSMikulas Patocka spinlock_t write_thread_lock; 15772d711c8SMike Snitzer struct task_struct *write_thread; 158b3c5fd30SMikulas Patocka struct rb_root write_tree; 159dc267621SMikulas Patocka 1607dbcd137SMilan Broz char *cipher_string; 161ef43aa38SMilan Broz char *cipher_auth; 162c538f6ecSOndrej Kozina char *key_string; 1635ebaee6dSMilan Broz 1641b1b58f5SJulia Lawall const struct crypt_iv_operations *iv_gen_ops; 16579066ad3SHerbert Xu union { 16660473592SMilan Broz struct iv_benbi_private benbi; 16734745785SMilan Broz struct iv_lmk_private lmk; 168ed04d981SMilan Broz struct iv_tcw_private tcw; 169bbb16584SMilan Broz struct iv_elephant_private elephant; 17079066ad3SHerbert Xu } iv_gen_private; 1718d683dcdSAliOS system security u64 iv_offset; 1721da177e4SLinus Torvalds unsigned int iv_size; 173ff3af92bSMikulas Patocka unsigned short int sector_size; 174ff3af92bSMikulas Patocka unsigned char sector_shift; 1751da177e4SLinus Torvalds 176ef43aa38SMilan Broz union { 177bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 178ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 179ef43aa38SMilan Broz } cipher_tfm; 180d1f96423SMilan Broz unsigned tfms_count; 181ef43aa38SMilan Broz unsigned long cipher_flags; 182c0297721SAndi Kleen 183c0297721SAndi Kleen /* 184ddd42edfSMilan Broz * Layout of each crypto request: 185ddd42edfSMilan Broz * 186bbdb23b5SHerbert Xu * struct skcipher_request 187ddd42edfSMilan Broz * context 188ddd42edfSMilan Broz * padding 189ddd42edfSMilan Broz * struct dm_crypt_request 190ddd42edfSMilan Broz * padding 191ddd42edfSMilan Broz * IV 192ddd42edfSMilan Broz * 193ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 194ddd42edfSMilan Broz * correctly aligned. 195ddd42edfSMilan Broz */ 196ddd42edfSMilan Broz unsigned int dmreq_start; 197ddd42edfSMilan Broz 198298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 199298a9fa0SMikulas Patocka 200e48d4bbfSMilan Broz unsigned long flags; 2011da177e4SLinus Torvalds unsigned int key_size; 202da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 203da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 204ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 205ef43aa38SMilan Broz 206ef43aa38SMilan Broz unsigned int integrity_tag_size; 207ef43aa38SMilan Broz unsigned int integrity_iv_size; 208ef43aa38SMilan Broz unsigned int on_disk_tag_size; 209ef43aa38SMilan Broz 21072d711c8SMike Snitzer /* 21172d711c8SMike Snitzer * pool for per bio private data, crypto requests, 21272d711c8SMike Snitzer * encryption requeusts/buffer pages and integrity tags 21372d711c8SMike Snitzer */ 21472d711c8SMike Snitzer unsigned tag_pool_max_sectors; 21572d711c8SMike Snitzer mempool_t tag_pool; 21672d711c8SMike Snitzer mempool_t req_pool; 21772d711c8SMike Snitzer mempool_t page_pool; 21872d711c8SMike Snitzer 21972d711c8SMike Snitzer struct bio_set bs; 22072d711c8SMike Snitzer struct mutex bio_alloc_lock; 22172d711c8SMike Snitzer 222ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 223b18ae8ddSGustavo A. R. Silva u8 key[]; 2241da177e4SLinus Torvalds }; 2251da177e4SLinus Torvalds 2260a83df6cSMikulas Patocka #define MIN_IOS 64 227ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 228ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2291da177e4SLinus Torvalds 2305059353dSMikulas Patocka static DEFINE_SPINLOCK(dm_crypt_clients_lock); 2315059353dSMikulas Patocka static unsigned dm_crypt_clients_n = 0; 2325059353dSMikulas Patocka static volatile unsigned long dm_crypt_pages_per_client; 2335059353dSMikulas Patocka #define DM_CRYPT_MEMORY_PERCENT 2 234a8affc03SChristoph Hellwig #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_VECS * 16) 2355059353dSMikulas Patocka 236028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 237395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 238ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 239ef43aa38SMilan Broz struct scatterlist *sg); 240027581f3SOlaf Kirch 2413fd53533SYang Yingliang static bool crypt_integrity_aead(struct crypt_config *cc); 2423fd53533SYang Yingliang 243c0297721SAndi Kleen /* 24486f917adSEric Biggers * Use this to access cipher attributes that are independent of the key. 245c0297721SAndi Kleen */ 246bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 247c0297721SAndi Kleen { 248ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 249ef43aa38SMilan Broz } 250ef43aa38SMilan Broz 251ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 252ef43aa38SMilan Broz { 253ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 254c0297721SAndi Kleen } 255c0297721SAndi Kleen 2561da177e4SLinus Torvalds /* 2571da177e4SLinus Torvalds * Different IV generation algorithms: 2581da177e4SLinus Torvalds * 2593c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2603a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2611da177e4SLinus Torvalds * 26261afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 26361afef61SMilan Broz * number, padded with zeros if necessary. 26461afef61SMilan Broz * 2657e3fd855SMilan Broz * plain64be: the initial vector is the 64-bit big-endian version of the sector 2667e3fd855SMilan Broz * number, padded with zeros if necessary. 2677e3fd855SMilan Broz * 2683c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2691da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2701da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2711da177e4SLinus Torvalds * 27248527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 27348527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 27448527fa7SRik Snel * 27546b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 27646b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 27746b47730SLudwig Nussel * 27834745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 27934745785SMilan Broz * by the Loop-AES block device encryption system 28034745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 28134745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 28234745785SMilan Broz * with an IV derived from the sector number, the data and 28334745785SMilan Broz * optionally extra IV seed. 28434745785SMilan Broz * This means that after decryption the first block 28534745785SMilan Broz * of sector must be tweaked according to decrypted data. 28634745785SMilan Broz * Loop-AES can use three encryption schemes: 28734745785SMilan Broz * version 1: is plain aes-cbc mode 28834745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 28934745785SMilan Broz * version 3: the same as version 2 with additional IV seed 29034745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 29134745785SMilan Broz * 292ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 293ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 294e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 295ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 296ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 297ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 298ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 299ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 300ed04d981SMilan Broz * and should be used for old compatible containers access only. 301b9411d73SMilan Broz * 302b9411d73SMilan Broz * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) 303b9411d73SMilan Broz * The IV is encrypted little-endian byte-offset (with the same key 304b9411d73SMilan Broz * and cipher as the volume). 305bbb16584SMilan Broz * 306bbb16584SMilan Broz * elephant: The extended version of eboiv with additional Elephant diffuser 307bbb16584SMilan Broz * used with Bitlocker CBC mode. 308bbb16584SMilan Broz * This mode was used in older Windows systems 3096f3bc22bSAlexander A. Klimov * https://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf 3101da177e4SLinus Torvalds */ 3111da177e4SLinus Torvalds 3122dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 3132dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 316283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds return 0; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 32161afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 3222dc5327dSMilan Broz struct dm_crypt_request *dmreq) 32361afef61SMilan Broz { 32461afef61SMilan Broz memset(iv, 0, cc->iv_size); 325283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 32661afef61SMilan Broz 32761afef61SMilan Broz return 0; 32861afef61SMilan Broz } 32961afef61SMilan Broz 3307e3fd855SMilan Broz static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, 3317e3fd855SMilan Broz struct dm_crypt_request *dmreq) 3327e3fd855SMilan Broz { 3337e3fd855SMilan Broz memset(iv, 0, cc->iv_size); 3347e3fd855SMilan Broz /* iv_size is at least of size u64; usually it is 16 bytes */ 3357e3fd855SMilan Broz *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); 3367e3fd855SMilan Broz 3377e3fd855SMilan Broz return 0; 3387e3fd855SMilan Broz } 3397e3fd855SMilan Broz 3402dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 3412dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3421da177e4SLinus Torvalds { 343a1a262b6SArd Biesheuvel /* 344a1a262b6SArd Biesheuvel * ESSIV encryption of the IV is now handled by the crypto API, 345a1a262b6SArd Biesheuvel * so just pass the plain sector number here. 346a1a262b6SArd Biesheuvel */ 3471da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 348283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 349c0297721SAndi Kleen 3501da177e4SLinus Torvalds return 0; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 35348527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 35448527fa7SRik Snel const char *opts) 35548527fa7SRik Snel { 3564ea9471fSMilan Broz unsigned bs; 3574ea9471fSMilan Broz int log; 3584ea9471fSMilan Broz 3593fd53533SYang Yingliang if (crypt_integrity_aead(cc)) 3604ea9471fSMilan Broz bs = crypto_aead_blocksize(any_tfm_aead(cc)); 3614ea9471fSMilan Broz else 3624ea9471fSMilan Broz bs = crypto_skcipher_blocksize(any_tfm(cc)); 3634ea9471fSMilan Broz log = ilog2(bs); 36448527fa7SRik Snel 36548527fa7SRik Snel /* we need to calculate how far we must shift the sector count 36648527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 36748527fa7SRik Snel 36848527fa7SRik Snel if (1 << log != bs) { 36948527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 37048527fa7SRik Snel return -EINVAL; 37148527fa7SRik Snel } 37248527fa7SRik Snel 37348527fa7SRik Snel if (log > 9) { 37448527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 37548527fa7SRik Snel return -EINVAL; 37648527fa7SRik Snel } 37748527fa7SRik Snel 37860473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 37948527fa7SRik Snel 38048527fa7SRik Snel return 0; 38148527fa7SRik Snel } 38248527fa7SRik Snel 38348527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 38448527fa7SRik Snel { 38548527fa7SRik Snel } 38648527fa7SRik Snel 3872dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 3882dc5327dSMilan Broz struct dm_crypt_request *dmreq) 38948527fa7SRik Snel { 39079066ad3SHerbert Xu __be64 val; 39179066ad3SHerbert Xu 39248527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 39379066ad3SHerbert Xu 3942dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 39579066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 39648527fa7SRik Snel 3971da177e4SLinus Torvalds return 0; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4002dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 4012dc5327dSMilan Broz struct dm_crypt_request *dmreq) 40246b47730SLudwig Nussel { 40346b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 40446b47730SLudwig Nussel 40546b47730SLudwig Nussel return 0; 40646b47730SLudwig Nussel } 40746b47730SLudwig Nussel 40834745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 40934745785SMilan Broz { 41034745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 41134745785SMilan Broz 41234745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 41334745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 41434745785SMilan Broz lmk->hash_tfm = NULL; 41534745785SMilan Broz 416453431a5SWaiman Long kfree_sensitive(lmk->seed); 41734745785SMilan Broz lmk->seed = NULL; 41834745785SMilan Broz } 41934745785SMilan Broz 42034745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 42134745785SMilan Broz const char *opts) 42234745785SMilan Broz { 42334745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 42434745785SMilan Broz 4258f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 4268f0009a2SMilan Broz ti->error = "Unsupported sector size for LMK"; 4278f0009a2SMilan Broz return -EINVAL; 4288f0009a2SMilan Broz } 4298f0009a2SMilan Broz 430cd746938SMikulas Patocka lmk->hash_tfm = crypto_alloc_shash("md5", 0, 431cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 43234745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 43334745785SMilan Broz ti->error = "Error initializing LMK hash"; 43434745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 43534745785SMilan Broz } 43634745785SMilan Broz 43734745785SMilan Broz /* No seed in LMK version 2 */ 43834745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 43934745785SMilan Broz lmk->seed = NULL; 44034745785SMilan Broz return 0; 44134745785SMilan Broz } 44234745785SMilan Broz 44334745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 44434745785SMilan Broz if (!lmk->seed) { 44534745785SMilan Broz crypt_iv_lmk_dtr(cc); 44634745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 44734745785SMilan Broz return -ENOMEM; 44834745785SMilan Broz } 44934745785SMilan Broz 45034745785SMilan Broz return 0; 45134745785SMilan Broz } 45234745785SMilan Broz 45334745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 45434745785SMilan Broz { 45534745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 45634745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 45734745785SMilan Broz 45834745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 45934745785SMilan Broz if (lmk->seed) 46034745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 46134745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 46234745785SMilan Broz 46334745785SMilan Broz return 0; 46434745785SMilan Broz } 46534745785SMilan Broz 46634745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 46734745785SMilan Broz { 46834745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 46934745785SMilan Broz 47034745785SMilan Broz if (lmk->seed) 47134745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 47234745785SMilan Broz 47334745785SMilan Broz return 0; 47434745785SMilan Broz } 47534745785SMilan Broz 47634745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 47734745785SMilan Broz struct dm_crypt_request *dmreq, 47834745785SMilan Broz u8 *data) 47934745785SMilan Broz { 48034745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 481b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 48234745785SMilan Broz struct md5_state md5state; 483da31a078SMilan Broz __le32 buf[4]; 48434745785SMilan Broz int i, r; 48534745785SMilan Broz 486b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 48734745785SMilan Broz 488b6106265SJan-Simon Möller r = crypto_shash_init(desc); 48934745785SMilan Broz if (r) 49034745785SMilan Broz return r; 49134745785SMilan Broz 49234745785SMilan Broz if (lmk->seed) { 493b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 49434745785SMilan Broz if (r) 49534745785SMilan Broz return r; 49634745785SMilan Broz } 49734745785SMilan Broz 49834745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 499b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 50034745785SMilan Broz if (r) 50134745785SMilan Broz return r; 50234745785SMilan Broz 50334745785SMilan Broz /* Sector is cropped to 56 bits here */ 50434745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 50534745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 50634745785SMilan Broz buf[2] = cpu_to_le32(4024); 50734745785SMilan Broz buf[3] = 0; 508b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 50934745785SMilan Broz if (r) 51034745785SMilan Broz return r; 51134745785SMilan Broz 51234745785SMilan Broz /* No MD5 padding here */ 513b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 51434745785SMilan Broz if (r) 51534745785SMilan Broz return r; 51634745785SMilan Broz 51734745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 51834745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 51934745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 52034745785SMilan Broz 52134745785SMilan Broz return 0; 52234745785SMilan Broz } 52334745785SMilan Broz 52434745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 52534745785SMilan Broz struct dm_crypt_request *dmreq) 52634745785SMilan Broz { 527ef43aa38SMilan Broz struct scatterlist *sg; 52834745785SMilan Broz u8 *src; 52934745785SMilan Broz int r = 0; 53034745785SMilan Broz 53134745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 532ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 533ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 534ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 535c2e022cbSCong Wang kunmap_atomic(src); 53634745785SMilan Broz } else 53734745785SMilan Broz memset(iv, 0, cc->iv_size); 53834745785SMilan Broz 53934745785SMilan Broz return r; 54034745785SMilan Broz } 54134745785SMilan Broz 54234745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 54334745785SMilan Broz struct dm_crypt_request *dmreq) 54434745785SMilan Broz { 545ef43aa38SMilan Broz struct scatterlist *sg; 54634745785SMilan Broz u8 *dst; 54734745785SMilan Broz int r; 54834745785SMilan Broz 54934745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 55034745785SMilan Broz return 0; 55134745785SMilan Broz 552ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 553ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 554ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 55534745785SMilan Broz 55634745785SMilan Broz /* Tweak the first block of plaintext sector */ 55734745785SMilan Broz if (!r) 558ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 55934745785SMilan Broz 560c2e022cbSCong Wang kunmap_atomic(dst); 56134745785SMilan Broz return r; 56234745785SMilan Broz } 56334745785SMilan Broz 564ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 565ed04d981SMilan Broz { 566ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 567ed04d981SMilan Broz 568453431a5SWaiman Long kfree_sensitive(tcw->iv_seed); 569ed04d981SMilan Broz tcw->iv_seed = NULL; 570453431a5SWaiman Long kfree_sensitive(tcw->whitening); 571ed04d981SMilan Broz tcw->whitening = NULL; 572ed04d981SMilan Broz 573ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 574ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 575ed04d981SMilan Broz tcw->crc32_tfm = NULL; 576ed04d981SMilan Broz } 577ed04d981SMilan Broz 578ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 579ed04d981SMilan Broz const char *opts) 580ed04d981SMilan Broz { 581ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 582ed04d981SMilan Broz 5838f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 5848f0009a2SMilan Broz ti->error = "Unsupported sector size for TCW"; 5858f0009a2SMilan Broz return -EINVAL; 5868f0009a2SMilan Broz } 5878f0009a2SMilan Broz 588ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 589ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 590ed04d981SMilan Broz return -EINVAL; 591ed04d981SMilan Broz } 592ed04d981SMilan Broz 593cd746938SMikulas Patocka tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 594cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 595ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 596ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 597ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 598ed04d981SMilan Broz } 599ed04d981SMilan Broz 600ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 601ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 602ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 603ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 604ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 605ed04d981SMilan Broz return -ENOMEM; 606ed04d981SMilan Broz } 607ed04d981SMilan Broz 608ed04d981SMilan Broz return 0; 609ed04d981SMilan Broz } 610ed04d981SMilan Broz 611ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 612ed04d981SMilan Broz { 613ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 614ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 615ed04d981SMilan Broz 616ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 617ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 618ed04d981SMilan Broz TCW_WHITENING_SIZE); 619ed04d981SMilan Broz 620ed04d981SMilan Broz return 0; 621ed04d981SMilan Broz } 622ed04d981SMilan Broz 623ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 624ed04d981SMilan Broz { 625ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 626ed04d981SMilan Broz 627ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 628ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 629ed04d981SMilan Broz 630ed04d981SMilan Broz return 0; 631ed04d981SMilan Broz } 632ed04d981SMilan Broz 633ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 634ed04d981SMilan Broz struct dm_crypt_request *dmreq, 635ed04d981SMilan Broz u8 *data) 636ed04d981SMilan Broz { 637ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 638350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 639ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 640b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 641ed04d981SMilan Broz int i, r; 642ed04d981SMilan Broz 643ed04d981SMilan Broz /* xor whitening with sector number */ 64445fe93dfSArd Biesheuvel crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); 64545fe93dfSArd Biesheuvel crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); 646ed04d981SMilan Broz 647ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 648b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 649ed04d981SMilan Broz for (i = 0; i < 4; i++) { 650b6106265SJan-Simon Möller r = crypto_shash_init(desc); 651ed04d981SMilan Broz if (r) 652ed04d981SMilan Broz goto out; 653b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 654ed04d981SMilan Broz if (r) 655ed04d981SMilan Broz goto out; 656b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 657ed04d981SMilan Broz if (r) 658ed04d981SMilan Broz goto out; 659ed04d981SMilan Broz } 660ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 661ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 662ed04d981SMilan Broz 663ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 664ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 665ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 666ed04d981SMilan Broz out: 6671a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 668ed04d981SMilan Broz return r; 669ed04d981SMilan Broz } 670ed04d981SMilan Broz 671ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 672ed04d981SMilan Broz struct dm_crypt_request *dmreq) 673ed04d981SMilan Broz { 674ef43aa38SMilan Broz struct scatterlist *sg; 675ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 676350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 677ed04d981SMilan Broz u8 *src; 678ed04d981SMilan Broz int r = 0; 679ed04d981SMilan Broz 680ed04d981SMilan Broz /* Remove whitening from ciphertext */ 681ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 682ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 683ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 684ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 685ed04d981SMilan Broz kunmap_atomic(src); 686ed04d981SMilan Broz } 687ed04d981SMilan Broz 688ed04d981SMilan Broz /* Calculate IV */ 68945fe93dfSArd Biesheuvel crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); 690ed04d981SMilan Broz if (cc->iv_size > 8) 69145fe93dfSArd Biesheuvel crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, 69245fe93dfSArd Biesheuvel cc->iv_size - 8); 693ed04d981SMilan Broz 694ed04d981SMilan Broz return r; 695ed04d981SMilan Broz } 696ed04d981SMilan Broz 697ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 698ed04d981SMilan Broz struct dm_crypt_request *dmreq) 699ed04d981SMilan Broz { 700ef43aa38SMilan Broz struct scatterlist *sg; 701ed04d981SMilan Broz u8 *dst; 702ed04d981SMilan Broz int r; 703ed04d981SMilan Broz 704ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 705ed04d981SMilan Broz return 0; 706ed04d981SMilan Broz 707ed04d981SMilan Broz /* Apply whitening on ciphertext */ 708ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 709ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 710ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 711ed04d981SMilan Broz kunmap_atomic(dst); 712ed04d981SMilan Broz 713ed04d981SMilan Broz return r; 714ed04d981SMilan Broz } 715ed04d981SMilan Broz 716ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 717ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 718ef43aa38SMilan Broz { 719ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 720ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 721ef43aa38SMilan Broz return 0; 722ef43aa38SMilan Broz } 723ef43aa38SMilan Broz 724b9411d73SMilan Broz static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, 725b9411d73SMilan Broz const char *opts) 726b9411d73SMilan Broz { 7273fd53533SYang Yingliang if (crypt_integrity_aead(cc)) { 72839d13a1aSArd Biesheuvel ti->error = "AEAD transforms not supported for EBOIV"; 729b9411d73SMilan Broz return -EINVAL; 730b9411d73SMilan Broz } 731b9411d73SMilan Broz 73239d13a1aSArd Biesheuvel if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { 73339d13a1aSArd Biesheuvel ti->error = "Block size of EBOIV cipher does " 73439d13a1aSArd Biesheuvel "not match IV size of block cipher"; 73539d13a1aSArd Biesheuvel return -EINVAL; 736b9411d73SMilan Broz } 737b9411d73SMilan Broz 738b9411d73SMilan Broz return 0; 739b9411d73SMilan Broz } 740b9411d73SMilan Broz 741b9411d73SMilan Broz static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, 742b9411d73SMilan Broz struct dm_crypt_request *dmreq) 743b9411d73SMilan Broz { 74439d13a1aSArd Biesheuvel u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64)); 74539d13a1aSArd Biesheuvel struct skcipher_request *req; 74639d13a1aSArd Biesheuvel struct scatterlist src, dst; 7477785a9e4SDamien Le Moal DECLARE_CRYPTO_WAIT(wait); 74839d13a1aSArd Biesheuvel int err; 749b9411d73SMilan Broz 7509402e959SMikulas Patocka req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO); 75139d13a1aSArd Biesheuvel if (!req) 75239d13a1aSArd Biesheuvel return -ENOMEM; 753b9411d73SMilan Broz 75439d13a1aSArd Biesheuvel memset(buf, 0, cc->iv_size); 75539d13a1aSArd Biesheuvel *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 75639d13a1aSArd Biesheuvel 75739d13a1aSArd Biesheuvel sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); 75839d13a1aSArd Biesheuvel sg_init_one(&dst, iv, cc->iv_size); 75939d13a1aSArd Biesheuvel skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); 76039d13a1aSArd Biesheuvel skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 76139d13a1aSArd Biesheuvel err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 76239d13a1aSArd Biesheuvel skcipher_request_free(req); 76339d13a1aSArd Biesheuvel 76439d13a1aSArd Biesheuvel return err; 765b9411d73SMilan Broz } 766b9411d73SMilan Broz 767bbb16584SMilan Broz static void crypt_iv_elephant_dtr(struct crypt_config *cc) 768bbb16584SMilan Broz { 769bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 770bbb16584SMilan Broz 771bbb16584SMilan Broz crypto_free_skcipher(elephant->tfm); 772bbb16584SMilan Broz elephant->tfm = NULL; 773bbb16584SMilan Broz } 774bbb16584SMilan Broz 775bbb16584SMilan Broz static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, 776bbb16584SMilan Broz const char *opts) 777bbb16584SMilan Broz { 778bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 779bbb16584SMilan Broz int r; 780bbb16584SMilan Broz 781cd746938SMikulas Patocka elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 782cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 783bbb16584SMilan Broz if (IS_ERR(elephant->tfm)) { 784bbb16584SMilan Broz r = PTR_ERR(elephant->tfm); 785bbb16584SMilan Broz elephant->tfm = NULL; 786bbb16584SMilan Broz return r; 787bbb16584SMilan Broz } 788bbb16584SMilan Broz 789bbb16584SMilan Broz r = crypt_iv_eboiv_ctr(cc, ti, NULL); 790bbb16584SMilan Broz if (r) 791bbb16584SMilan Broz crypt_iv_elephant_dtr(cc); 792bbb16584SMilan Broz return r; 793bbb16584SMilan Broz } 794bbb16584SMilan Broz 795bbb16584SMilan Broz static void diffuser_disk_to_cpu(u32 *d, size_t n) 796bbb16584SMilan Broz { 797bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 798bbb16584SMilan Broz int i; 799bbb16584SMilan Broz 800bbb16584SMilan Broz for (i = 0; i < n; i++) 801bbb16584SMilan Broz d[i] = le32_to_cpu((__le32)d[i]); 802bbb16584SMilan Broz #endif 803bbb16584SMilan Broz } 804bbb16584SMilan Broz 805bbb16584SMilan Broz static void diffuser_cpu_to_disk(__le32 *d, size_t n) 806bbb16584SMilan Broz { 807bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 808bbb16584SMilan Broz int i; 809bbb16584SMilan Broz 810bbb16584SMilan Broz for (i = 0; i < n; i++) 811bbb16584SMilan Broz d[i] = cpu_to_le32((u32)d[i]); 812bbb16584SMilan Broz #endif 813bbb16584SMilan Broz } 814bbb16584SMilan Broz 815bbb16584SMilan Broz static void diffuser_a_decrypt(u32 *d, size_t n) 816bbb16584SMilan Broz { 817bbb16584SMilan Broz int i, i1, i2, i3; 818bbb16584SMilan Broz 819bbb16584SMilan Broz for (i = 0; i < 5; i++) { 820bbb16584SMilan Broz i1 = 0; 821bbb16584SMilan Broz i2 = n - 2; 822bbb16584SMilan Broz i3 = n - 5; 823bbb16584SMilan Broz 824bbb16584SMilan Broz while (i1 < (n - 1)) { 825bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 826bbb16584SMilan Broz i1++; i2++; i3++; 827bbb16584SMilan Broz 828bbb16584SMilan Broz if (i3 >= n) 829bbb16584SMilan Broz i3 -= n; 830bbb16584SMilan Broz 831bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 832bbb16584SMilan Broz i1++; i2++; i3++; 833bbb16584SMilan Broz 834bbb16584SMilan Broz if (i2 >= n) 835bbb16584SMilan Broz i2 -= n; 836bbb16584SMilan Broz 837bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 838bbb16584SMilan Broz i1++; i2++; i3++; 839bbb16584SMilan Broz 840bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 841bbb16584SMilan Broz i1++; i2++; i3++; 842bbb16584SMilan Broz } 843bbb16584SMilan Broz } 844bbb16584SMilan Broz } 845bbb16584SMilan Broz 846bbb16584SMilan Broz static void diffuser_a_encrypt(u32 *d, size_t n) 847bbb16584SMilan Broz { 848bbb16584SMilan Broz int i, i1, i2, i3; 849bbb16584SMilan Broz 850bbb16584SMilan Broz for (i = 0; i < 5; i++) { 851bbb16584SMilan Broz i1 = n - 1; 852bbb16584SMilan Broz i2 = n - 2 - 1; 853bbb16584SMilan Broz i3 = n - 5 - 1; 854bbb16584SMilan Broz 855bbb16584SMilan Broz while (i1 > 0) { 856bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 857bbb16584SMilan Broz i1--; i2--; i3--; 858bbb16584SMilan Broz 859bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 860bbb16584SMilan Broz i1--; i2--; i3--; 861bbb16584SMilan Broz 862bbb16584SMilan Broz if (i2 < 0) 863bbb16584SMilan Broz i2 += n; 864bbb16584SMilan Broz 865bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 866bbb16584SMilan Broz i1--; i2--; i3--; 867bbb16584SMilan Broz 868bbb16584SMilan Broz if (i3 < 0) 869bbb16584SMilan Broz i3 += n; 870bbb16584SMilan Broz 871bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 872bbb16584SMilan Broz i1--; i2--; i3--; 873bbb16584SMilan Broz } 874bbb16584SMilan Broz } 875bbb16584SMilan Broz } 876bbb16584SMilan Broz 877bbb16584SMilan Broz static void diffuser_b_decrypt(u32 *d, size_t n) 878bbb16584SMilan Broz { 879bbb16584SMilan Broz int i, i1, i2, i3; 880bbb16584SMilan Broz 881bbb16584SMilan Broz for (i = 0; i < 3; i++) { 882bbb16584SMilan Broz i1 = 0; 883bbb16584SMilan Broz i2 = 2; 884bbb16584SMilan Broz i3 = 5; 885bbb16584SMilan Broz 886bbb16584SMilan Broz while (i1 < (n - 1)) { 887bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 888bbb16584SMilan Broz i1++; i2++; i3++; 889bbb16584SMilan Broz 890bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 891bbb16584SMilan Broz i1++; i2++; i3++; 892bbb16584SMilan Broz 893bbb16584SMilan Broz if (i2 >= n) 894bbb16584SMilan Broz i2 -= n; 895bbb16584SMilan Broz 896bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 897bbb16584SMilan Broz i1++; i2++; i3++; 898bbb16584SMilan Broz 899bbb16584SMilan Broz if (i3 >= n) 900bbb16584SMilan Broz i3 -= n; 901bbb16584SMilan Broz 902bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 903bbb16584SMilan Broz i1++; i2++; i3++; 904bbb16584SMilan Broz } 905bbb16584SMilan Broz } 906bbb16584SMilan Broz } 907bbb16584SMilan Broz 908bbb16584SMilan Broz static void diffuser_b_encrypt(u32 *d, size_t n) 909bbb16584SMilan Broz { 910bbb16584SMilan Broz int i, i1, i2, i3; 911bbb16584SMilan Broz 912bbb16584SMilan Broz for (i = 0; i < 3; i++) { 913bbb16584SMilan Broz i1 = n - 1; 914bbb16584SMilan Broz i2 = 2 - 1; 915bbb16584SMilan Broz i3 = 5 - 1; 916bbb16584SMilan Broz 917bbb16584SMilan Broz while (i1 > 0) { 918bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 919bbb16584SMilan Broz i1--; i2--; i3--; 920bbb16584SMilan Broz 921bbb16584SMilan Broz if (i3 < 0) 922bbb16584SMilan Broz i3 += n; 923bbb16584SMilan Broz 924bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 925bbb16584SMilan Broz i1--; i2--; i3--; 926bbb16584SMilan Broz 927bbb16584SMilan Broz if (i2 < 0) 928bbb16584SMilan Broz i2 += n; 929bbb16584SMilan Broz 930bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 931bbb16584SMilan Broz i1--; i2--; i3--; 932bbb16584SMilan Broz 933bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 934bbb16584SMilan Broz i1--; i2--; i3--; 935bbb16584SMilan Broz } 936bbb16584SMilan Broz } 937bbb16584SMilan Broz } 938bbb16584SMilan Broz 939bbb16584SMilan Broz static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq) 940bbb16584SMilan Broz { 941bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 942bbb16584SMilan Broz u8 *es, *ks, *data, *data2, *data_offset; 943bbb16584SMilan Broz struct skcipher_request *req; 944bbb16584SMilan Broz struct scatterlist *sg, *sg2, src, dst; 9457785a9e4SDamien Le Moal DECLARE_CRYPTO_WAIT(wait); 946bbb16584SMilan Broz int i, r; 947bbb16584SMilan Broz 948bbb16584SMilan Broz req = skcipher_request_alloc(elephant->tfm, GFP_NOIO); 949bbb16584SMilan Broz es = kzalloc(16, GFP_NOIO); /* Key for AES */ 950bbb16584SMilan Broz ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */ 951bbb16584SMilan Broz 952bbb16584SMilan Broz if (!req || !es || !ks) { 953bbb16584SMilan Broz r = -ENOMEM; 954bbb16584SMilan Broz goto out; 955bbb16584SMilan Broz } 956bbb16584SMilan Broz 957bbb16584SMilan Broz *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 958bbb16584SMilan Broz 959bbb16584SMilan Broz /* E(Ks, e(s)) */ 960bbb16584SMilan Broz sg_init_one(&src, es, 16); 961bbb16584SMilan Broz sg_init_one(&dst, ks, 16); 962bbb16584SMilan Broz skcipher_request_set_crypt(req, &src, &dst, 16, NULL); 963bbb16584SMilan Broz skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 964bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 965bbb16584SMilan Broz if (r) 966bbb16584SMilan Broz goto out; 967bbb16584SMilan Broz 968bbb16584SMilan Broz /* E(Ks, e'(s)) */ 969bbb16584SMilan Broz es[15] = 0x80; 970bbb16584SMilan Broz sg_init_one(&dst, &ks[16], 16); 971bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 972bbb16584SMilan Broz if (r) 973bbb16584SMilan Broz goto out; 974bbb16584SMilan Broz 975bbb16584SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 976bbb16584SMilan Broz data = kmap_atomic(sg_page(sg)); 977bbb16584SMilan Broz data_offset = data + sg->offset; 978bbb16584SMilan Broz 979bbb16584SMilan Broz /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ 980bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 981bbb16584SMilan Broz sg2 = crypt_get_sg_data(cc, dmreq->sg_in); 982bbb16584SMilan Broz data2 = kmap_atomic(sg_page(sg2)); 983bbb16584SMilan Broz memcpy(data_offset, data2 + sg2->offset, cc->sector_size); 984bbb16584SMilan Broz kunmap_atomic(data2); 985bbb16584SMilan Broz } 986bbb16584SMilan Broz 987bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 988bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 989bbb16584SMilan Broz diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 990bbb16584SMilan Broz diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 991bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 992bbb16584SMilan Broz } 993bbb16584SMilan Broz 994bbb16584SMilan Broz for (i = 0; i < (cc->sector_size / 32); i++) 995bbb16584SMilan Broz crypto_xor(data_offset + i * 32, ks, 32); 996bbb16584SMilan Broz 997bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 998bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 999bbb16584SMilan Broz diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 1000bbb16584SMilan Broz diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 1001bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 1002bbb16584SMilan Broz } 1003bbb16584SMilan Broz 1004bbb16584SMilan Broz kunmap_atomic(data); 1005bbb16584SMilan Broz out: 1006453431a5SWaiman Long kfree_sensitive(ks); 1007453431a5SWaiman Long kfree_sensitive(es); 1008bbb16584SMilan Broz skcipher_request_free(req); 1009bbb16584SMilan Broz return r; 1010bbb16584SMilan Broz } 1011bbb16584SMilan Broz 1012bbb16584SMilan Broz static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, 1013bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1014bbb16584SMilan Broz { 1015bbb16584SMilan Broz int r; 1016bbb16584SMilan Broz 1017bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 1018bbb16584SMilan Broz r = crypt_iv_elephant(cc, dmreq); 1019bbb16584SMilan Broz if (r) 1020bbb16584SMilan Broz return r; 1021bbb16584SMilan Broz } 1022bbb16584SMilan Broz 1023bbb16584SMilan Broz return crypt_iv_eboiv_gen(cc, iv, dmreq); 1024bbb16584SMilan Broz } 1025bbb16584SMilan Broz 1026bbb16584SMilan Broz static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, 1027bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1028bbb16584SMilan Broz { 1029bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 1030bbb16584SMilan Broz return crypt_iv_elephant(cc, dmreq); 1031bbb16584SMilan Broz 1032bbb16584SMilan Broz return 0; 1033bbb16584SMilan Broz } 1034bbb16584SMilan Broz 1035bbb16584SMilan Broz static int crypt_iv_elephant_init(struct crypt_config *cc) 1036bbb16584SMilan Broz { 1037bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1038bbb16584SMilan Broz int key_offset = cc->key_size - cc->key_extra_size; 1039bbb16584SMilan Broz 1040bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size); 1041bbb16584SMilan Broz } 1042bbb16584SMilan Broz 1043bbb16584SMilan Broz static int crypt_iv_elephant_wipe(struct crypt_config *cc) 1044bbb16584SMilan Broz { 1045bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1046bbb16584SMilan Broz u8 key[ELEPHANT_MAX_KEY_SIZE]; 1047bbb16584SMilan Broz 1048bbb16584SMilan Broz memset(key, 0, cc->key_extra_size); 1049bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size); 1050bbb16584SMilan Broz } 1051bbb16584SMilan Broz 10521b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 10531da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 10541da177e4SLinus Torvalds }; 10551da177e4SLinus Torvalds 10561b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 105761afef61SMilan Broz .generator = crypt_iv_plain64_gen 105861afef61SMilan Broz }; 105961afef61SMilan Broz 10607e3fd855SMilan Broz static const struct crypt_iv_operations crypt_iv_plain64be_ops = { 10617e3fd855SMilan Broz .generator = crypt_iv_plain64be_gen 10627e3fd855SMilan Broz }; 10637e3fd855SMilan Broz 10641b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 10651da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 10661da177e4SLinus Torvalds }; 10671da177e4SLinus Torvalds 10681b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 106948527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 107048527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 107148527fa7SRik Snel .generator = crypt_iv_benbi_gen 107248527fa7SRik Snel }; 10731da177e4SLinus Torvalds 10741b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 107546b47730SLudwig Nussel .generator = crypt_iv_null_gen 107646b47730SLudwig Nussel }; 107746b47730SLudwig Nussel 10781b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 107934745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 108034745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 108134745785SMilan Broz .init = crypt_iv_lmk_init, 108234745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 108334745785SMilan Broz .generator = crypt_iv_lmk_gen, 108434745785SMilan Broz .post = crypt_iv_lmk_post 108534745785SMilan Broz }; 108634745785SMilan Broz 10871b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 1088ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 1089ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 1090ed04d981SMilan Broz .init = crypt_iv_tcw_init, 1091ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 1092ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 1093ed04d981SMilan Broz .post = crypt_iv_tcw_post 1094ed04d981SMilan Broz }; 1095ed04d981SMilan Broz 1096e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_random_ops = { 1097ef43aa38SMilan Broz .generator = crypt_iv_random_gen 1098ef43aa38SMilan Broz }; 1099ef43aa38SMilan Broz 1100e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_eboiv_ops = { 1101b9411d73SMilan Broz .ctr = crypt_iv_eboiv_ctr, 1102b9411d73SMilan Broz .generator = crypt_iv_eboiv_gen 1103b9411d73SMilan Broz }; 1104b9411d73SMilan Broz 1105e8dc79d1SRikard Falkeborn static const struct crypt_iv_operations crypt_iv_elephant_ops = { 1106bbb16584SMilan Broz .ctr = crypt_iv_elephant_ctr, 1107bbb16584SMilan Broz .dtr = crypt_iv_elephant_dtr, 1108bbb16584SMilan Broz .init = crypt_iv_elephant_init, 1109bbb16584SMilan Broz .wipe = crypt_iv_elephant_wipe, 1110bbb16584SMilan Broz .generator = crypt_iv_elephant_gen, 1111bbb16584SMilan Broz .post = crypt_iv_elephant_post 1112bbb16584SMilan Broz }; 1113bbb16584SMilan Broz 1114ef43aa38SMilan Broz /* 1115ef43aa38SMilan Broz * Integrity extensions 1116ef43aa38SMilan Broz */ 1117ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 1118ef43aa38SMilan Broz { 1119ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 1120ef43aa38SMilan Broz } 1121ef43aa38SMilan Broz 1122ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 1123ef43aa38SMilan Broz { 112433d2f09fSMilan Broz return crypt_integrity_aead(cc) && cc->key_mac_size; 1125ef43aa38SMilan Broz } 1126ef43aa38SMilan Broz 1127ef43aa38SMilan Broz /* Get sg containing data */ 1128ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 1129ef43aa38SMilan Broz struct scatterlist *sg) 1130ef43aa38SMilan Broz { 113133d2f09fSMilan Broz if (unlikely(crypt_integrity_aead(cc))) 1132ef43aa38SMilan Broz return &sg[2]; 1133ef43aa38SMilan Broz 1134ef43aa38SMilan Broz return sg; 1135ef43aa38SMilan Broz } 1136ef43aa38SMilan Broz 1137ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 1138ef43aa38SMilan Broz { 1139ef43aa38SMilan Broz struct bio_integrity_payload *bip; 1140ef43aa38SMilan Broz unsigned int tag_len; 1141ef43aa38SMilan Broz int ret; 1142ef43aa38SMilan Broz 1143ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 1144ef43aa38SMilan Broz return 0; 1145ef43aa38SMilan Broz 1146ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 1147ef43aa38SMilan Broz if (IS_ERR(bip)) 1148ef43aa38SMilan Broz return PTR_ERR(bip); 1149ef43aa38SMilan Broz 1150ff0c129dSMikulas Patocka tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); 1151ef43aa38SMilan Broz 1152ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 1153ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 1154ef43aa38SMilan Broz 1155ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 1156ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 1157ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 1158ef43aa38SMilan Broz return -ENOMEM; 1159ef43aa38SMilan Broz 1160ef43aa38SMilan Broz return 0; 1161ef43aa38SMilan Broz } 1162ef43aa38SMilan Broz 1163ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 1164ef43aa38SMilan Broz { 1165ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 1166ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 11677a1cd723SMilan Broz struct mapped_device *md = dm_table_get_md(ti->table); 1168ef43aa38SMilan Broz 1169ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 1170ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 1171ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1172ef43aa38SMilan Broz return -EINVAL; 1173ef43aa38SMilan Broz } 1174ef43aa38SMilan Broz 1175583fe747SMikulas Patocka if (bi->tag_size != cc->on_disk_tag_size || 1176583fe747SMikulas Patocka bi->tuple_size != cc->on_disk_tag_size) { 1177ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 1178ef43aa38SMilan Broz return -EINVAL; 1179ef43aa38SMilan Broz } 1180583fe747SMikulas Patocka if (1 << bi->interval_exp != cc->sector_size) { 1181583fe747SMikulas Patocka ti->error = "Integrity profile sector size mismatch."; 1182583fe747SMikulas Patocka return -EINVAL; 1183583fe747SMikulas Patocka } 1184ef43aa38SMilan Broz 118533d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 1186ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 11877a1cd723SMilan Broz DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), 1188ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 1189ef43aa38SMilan Broz 1190ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 1191ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 1192ef43aa38SMilan Broz return -EINVAL; 1193ef43aa38SMilan Broz } 1194ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 11957a1cd723SMilan Broz DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), 1196ef43aa38SMilan Broz cc->integrity_iv_size); 1197ef43aa38SMilan Broz 1198ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 1199ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 1200ef43aa38SMilan Broz return -EINVAL; 1201ef43aa38SMilan Broz } 1202ef43aa38SMilan Broz 1203ef43aa38SMilan Broz return 0; 1204ef43aa38SMilan Broz #else 1205ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1206ef43aa38SMilan Broz return -EINVAL; 1207ef43aa38SMilan Broz #endif 1208ef43aa38SMilan Broz } 1209ef43aa38SMilan Broz 1210d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 1211d469f841SMilan Broz struct convert_context *ctx, 12121da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 1213fcd369daSMilan Broz sector_t sector) 12141da177e4SLinus Torvalds { 12151da177e4SLinus Torvalds ctx->bio_in = bio_in; 12161da177e4SLinus Torvalds ctx->bio_out = bio_out; 1217003b5c57SKent Overstreet if (bio_in) 1218003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 1219003b5c57SKent Overstreet if (bio_out) 1220003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 1221c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 122243d69034SMilan Broz init_completion(&ctx->restart); 12231da177e4SLinus Torvalds } 12241da177e4SLinus Torvalds 1225b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 1226ef43aa38SMilan Broz void *req) 1227b2174eebSHuang Ying { 1228b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 1229b2174eebSHuang Ying } 1230b2174eebSHuang Ying 1231ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 1232b2174eebSHuang Ying { 1233ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 1234b2174eebSHuang Ying } 1235b2174eebSHuang Ying 12362dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 12372dc5327dSMilan Broz struct dm_crypt_request *dmreq) 12382dc5327dSMilan Broz { 123933d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1240ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1241ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1242ef43aa38SMilan Broz else 12432dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1244bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 12452dc5327dSMilan Broz } 12462dc5327dSMilan Broz 1247ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1248ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1249ef43aa38SMilan Broz { 1250ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1251ef43aa38SMilan Broz } 1252ef43aa38SMilan Broz 1253c13b5487SChristoph Hellwig static __le64 *org_sector_of_dmreq(struct crypt_config *cc, 1254ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1255ef43aa38SMilan Broz { 1256ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1257c13b5487SChristoph Hellwig return (__le64 *) ptr; 1258ef43aa38SMilan Broz } 1259ef43aa38SMilan Broz 1260ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1261ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1262ef43aa38SMilan Broz { 1263ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1264ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1265ef43aa38SMilan Broz return (unsigned int*)ptr; 1266ef43aa38SMilan Broz } 1267ef43aa38SMilan Broz 1268ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1269ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1270ef43aa38SMilan Broz { 1271ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1272ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1273ef43aa38SMilan Broz 1274ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1275ef43aa38SMilan Broz cc->on_disk_tag_size]; 1276ef43aa38SMilan Broz } 1277ef43aa38SMilan Broz 1278ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1279ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1280ef43aa38SMilan Broz { 1281ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1282ef43aa38SMilan Broz } 1283ef43aa38SMilan Broz 1284ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 12853a7f6c99SMilan Broz struct convert_context *ctx, 1286ef43aa38SMilan Broz struct aead_request *req, 1287ef43aa38SMilan Broz unsigned int tag_offset) 128801482b76SMilan Broz { 1289003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1290003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 12913a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1292ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1293c13b5487SChristoph Hellwig __le64 *sector; 1294ef43aa38SMilan Broz int r = 0; 1295ef43aa38SMilan Broz 1296ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 129701482b76SMilan Broz 12988f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 12990440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 13008f0009a2SMilan Broz return -EIO; 130101482b76SMilan Broz 1302b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1303c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 13048f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1305ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1306b2174eebSHuang Ying dmreq->ctx = ctx; 130701482b76SMilan Broz 1308ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 130901482b76SMilan Broz 1310ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1311ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1312ef43aa38SMilan Broz 1313ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1314ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1315ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1316ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1317ef43aa38SMilan Broz 1318ef43aa38SMilan Broz /* AEAD request: 1319ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1320ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1321ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1322ef43aa38SMilan Broz */ 1323ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1324ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1325ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 13268f0009a2SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1327ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1328ef43aa38SMilan Broz 1329ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1330ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1331ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 13328f0009a2SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1333ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 133401482b76SMilan Broz 13353a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1336ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1337ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1338ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1339ef43aa38SMilan Broz } else { 1340ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 13413a7f6c99SMilan Broz if (r < 0) 13423a7f6c99SMilan Broz return r; 1343ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1344ef43aa38SMilan Broz if (cc->integrity_iv_size) 1345ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1346ef43aa38SMilan Broz } 1347ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1348ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1349ef43aa38SMilan Broz } 1350ef43aa38SMilan Broz 1351ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1352ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1353ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13548f0009a2SMilan Broz cc->sector_size, iv); 1355ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1356ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1357ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1358ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1359ef43aa38SMilan Broz } else { 1360ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13618f0009a2SMilan Broz cc->sector_size + cc->integrity_tag_size, iv); 1362ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1363ef43aa38SMilan Broz } 1364ef43aa38SMilan Broz 1365f710126cSMilan Broz if (r == -EBADMSG) { 1366f710126cSMilan Broz char b[BDEVNAME_SIZE]; 136758d0f180SMichael Weiß sector_t s = le64_to_cpu(*sector); 136858d0f180SMichael Weiß 136958d0f180SMichael Weiß DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", 137058d0f180SMichael Weiß bio_devname(ctx->bio_in, b), s); 137158d0f180SMichael Weiß dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 137258d0f180SMichael Weiß ctx->bio_in, s, 0); 1373f710126cSMilan Broz } 1374ef43aa38SMilan Broz 1375ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1376ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1377ef43aa38SMilan Broz 13788f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 13798f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1380ef43aa38SMilan Broz 1381ef43aa38SMilan Broz return r; 13823a7f6c99SMilan Broz } 13833a7f6c99SMilan Broz 1384ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1385ef43aa38SMilan Broz struct convert_context *ctx, 1386ef43aa38SMilan Broz struct skcipher_request *req, 1387ef43aa38SMilan Broz unsigned int tag_offset) 1388ef43aa38SMilan Broz { 1389ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1390ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1391ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1392ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1393ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1394c13b5487SChristoph Hellwig __le64 *sector; 1395ef43aa38SMilan Broz int r = 0; 1396ef43aa38SMilan Broz 13978f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 13980440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 13998f0009a2SMilan Broz return -EIO; 14008f0009a2SMilan Broz 1401ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1402ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 14038f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1404ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1405ef43aa38SMilan Broz dmreq->ctx = ctx; 1406ef43aa38SMilan Broz 1407ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1408ef43aa38SMilan Broz 1409ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1410ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1411ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1412ef43aa38SMilan Broz 1413ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1414ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1415ef43aa38SMilan Broz 1416ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1417ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1418ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1419ef43aa38SMilan Broz 1420ef43aa38SMilan Broz sg_init_table(sg_in, 1); 14218f0009a2SMilan Broz sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1422ef43aa38SMilan Broz 1423ef43aa38SMilan Broz sg_init_table(sg_out, 1); 14248f0009a2SMilan Broz sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1425ef43aa38SMilan Broz 1426ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1427ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1428ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1429ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1430ef43aa38SMilan Broz } else { 1431ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1432ef43aa38SMilan Broz if (r < 0) 1433ef43aa38SMilan Broz return r; 1434bbb16584SMilan Broz /* Data can be already preprocessed in generator */ 1435bbb16584SMilan Broz if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) 1436bbb16584SMilan Broz sg_in = sg_out; 1437ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1438ef43aa38SMilan Broz if (cc->integrity_iv_size) 1439ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1440ef43aa38SMilan Broz } 1441ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1442ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1443ef43aa38SMilan Broz } 1444ef43aa38SMilan Broz 14458f0009a2SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 14463a7f6c99SMilan Broz 14473a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1448bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 14493a7f6c99SMilan Broz else 1450bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 14513a7f6c99SMilan Broz 14522dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1453ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1454ef43aa38SMilan Broz 14558f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 14568f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 14572dc5327dSMilan Broz 14583a7f6c99SMilan Broz return r; 145901482b76SMilan Broz } 146001482b76SMilan Broz 146195497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 146295497a96SMilan Broz int error); 1463c0297721SAndi Kleen 1464d68b2958SIgnat Korchagin static int crypt_alloc_req_skcipher(struct crypt_config *cc, 1465ddd42edfSMilan Broz struct convert_context *ctx) 1466ddd42edfSMilan Broz { 1467c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1468c0297721SAndi Kleen 1469d68b2958SIgnat Korchagin if (!ctx->r.req) { 1470d68b2958SIgnat Korchagin ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1471ef43aa38SMilan Broz if (!ctx->r.req) 1472d68b2958SIgnat Korchagin return -ENOMEM; 1473d68b2958SIgnat Korchagin } 1474c0297721SAndi Kleen 1475ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 147654cea3f6SMilan Broz 147754cea3f6SMilan Broz /* 147854cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 147954cea3f6SMilan Broz * requests if driver request queue is full. 148054cea3f6SMilan Broz */ 1481ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1482432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1483ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1484d68b2958SIgnat Korchagin 1485d68b2958SIgnat Korchagin return 0; 1486ddd42edfSMilan Broz } 1487ddd42edfSMilan Broz 1488d68b2958SIgnat Korchagin static int crypt_alloc_req_aead(struct crypt_config *cc, 1489ef43aa38SMilan Broz struct convert_context *ctx) 1490ef43aa38SMilan Broz { 1491004b8ae9SIgnat Korchagin if (!ctx->r.req_aead) { 1492004b8ae9SIgnat Korchagin ctx->r.req_aead = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO); 1493004b8ae9SIgnat Korchagin if (!ctx->r.req_aead) 1494d68b2958SIgnat Korchagin return -ENOMEM; 1495d68b2958SIgnat Korchagin } 1496ef43aa38SMilan Broz 1497ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1498ef43aa38SMilan Broz 1499ef43aa38SMilan Broz /* 1500ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1501ef43aa38SMilan Broz * requests if driver request queue is full. 1502ef43aa38SMilan Broz */ 1503ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1504432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1505ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1506d68b2958SIgnat Korchagin 1507d68b2958SIgnat Korchagin return 0; 1508ef43aa38SMilan Broz } 1509ef43aa38SMilan Broz 1510d68b2958SIgnat Korchagin static int crypt_alloc_req(struct crypt_config *cc, 1511ef43aa38SMilan Broz struct convert_context *ctx) 1512ef43aa38SMilan Broz { 151333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1514d68b2958SIgnat Korchagin return crypt_alloc_req_aead(cc, ctx); 1515ef43aa38SMilan Broz else 1516d68b2958SIgnat Korchagin return crypt_alloc_req_skcipher(cc, ctx); 1517ef43aa38SMilan Broz } 1518ef43aa38SMilan Broz 1519ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1520bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1521298a9fa0SMikulas Patocka { 1522298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1523298a9fa0SMikulas Patocka 1524bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 15256f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1526298a9fa0SMikulas Patocka } 1527298a9fa0SMikulas Patocka 1528ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1529ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1530ef43aa38SMilan Broz { 1531ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1532ef43aa38SMilan Broz 1533ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 15346f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1535ef43aa38SMilan Broz } 1536ef43aa38SMilan Broz 1537ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1538ef43aa38SMilan Broz { 153933d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1540ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1541ef43aa38SMilan Broz else 1542ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1543ef43aa38SMilan Broz } 1544ef43aa38SMilan Broz 15451da177e4SLinus Torvalds /* 15461da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 15471da177e4SLinus Torvalds */ 15484e4cbee9SChristoph Hellwig static blk_status_t crypt_convert(struct crypt_config *cc, 15498abec36dSIgnat Korchagin struct convert_context *ctx, bool atomic, bool reset_pending) 15501da177e4SLinus Torvalds { 1551ef43aa38SMilan Broz unsigned int tag_offset = 0; 1552ff3af92bSMikulas Patocka unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 15533f1e9070SMilan Broz int r; 15541da177e4SLinus Torvalds 15558abec36dSIgnat Korchagin /* 15568abec36dSIgnat Korchagin * if reset_pending is set we are dealing with the bio for the first time, 15578abec36dSIgnat Korchagin * else we're continuing to work on the previous bio, so don't mess with 15588abec36dSIgnat Korchagin * the cc_pending counter 15598abec36dSIgnat Korchagin */ 15608abec36dSIgnat Korchagin if (reset_pending) 156140b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1562c8081618SMilan Broz 1563003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 15641da177e4SLinus Torvalds 1565d68b2958SIgnat Korchagin r = crypt_alloc_req(cc, ctx); 1566d68b2958SIgnat Korchagin if (r) { 1567d68b2958SIgnat Korchagin complete(&ctx->restart); 1568d68b2958SIgnat Korchagin return BLK_STS_DEV_RESOURCE; 1569d68b2958SIgnat Korchagin } 1570d68b2958SIgnat Korchagin 157140b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 15723f1e9070SMilan Broz 157333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1574ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1575ef43aa38SMilan Broz else 1576ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 15773a7f6c99SMilan Broz 15783a7f6c99SMilan Broz switch (r) { 157954cea3f6SMilan Broz /* 158054cea3f6SMilan Broz * The request was queued by a crypto driver 158154cea3f6SMilan Broz * but the driver request queue is full, let's wait. 158254cea3f6SMilan Broz */ 15833a7f6c99SMilan Broz case -EBUSY: 15848abec36dSIgnat Korchagin if (in_interrupt()) { 15858abec36dSIgnat Korchagin if (try_wait_for_completion(&ctx->restart)) { 15868abec36dSIgnat Korchagin /* 15878abec36dSIgnat Korchagin * we don't have to block to wait for completion, 15888abec36dSIgnat Korchagin * so proceed 15898abec36dSIgnat Korchagin */ 15908abec36dSIgnat Korchagin } else { 15918abec36dSIgnat Korchagin /* 15928abec36dSIgnat Korchagin * we can't wait for completion without blocking 15938abec36dSIgnat Korchagin * exit and continue processing in a workqueue 15948abec36dSIgnat Korchagin */ 15958abec36dSIgnat Korchagin ctx->r.req = NULL; 15968abec36dSIgnat Korchagin ctx->cc_sector += sector_step; 15978abec36dSIgnat Korchagin tag_offset++; 15988abec36dSIgnat Korchagin return BLK_STS_DEV_RESOURCE; 15998abec36dSIgnat Korchagin } 16008abec36dSIgnat Korchagin } else { 16013a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 16028abec36dSIgnat Korchagin } 160316735d02SWolfram Sang reinit_completion(&ctx->restart); 1604df561f66SGustavo A. R. Silva fallthrough; 160554cea3f6SMilan Broz /* 160654cea3f6SMilan Broz * The request is queued and processed asynchronously, 160754cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 160854cea3f6SMilan Broz */ 1609c0403ec0SRabin Vincent case -EINPROGRESS: 1610ef43aa38SMilan Broz ctx->r.req = NULL; 16118f0009a2SMilan Broz ctx->cc_sector += sector_step; 1612583fe747SMikulas Patocka tag_offset++; 16133a7f6c99SMilan Broz continue; 161454cea3f6SMilan Broz /* 161554cea3f6SMilan Broz * The request was already processed (synchronously). 161654cea3f6SMilan Broz */ 16173f1e9070SMilan Broz case 0: 161840b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 16198f0009a2SMilan Broz ctx->cc_sector += sector_step; 1620583fe747SMikulas Patocka tag_offset++; 162139d42fa9SIgnat Korchagin if (!atomic) 1622c7f1b204SMilan Broz cond_resched(); 16233f1e9070SMilan Broz continue; 1624ef43aa38SMilan Broz /* 1625ef43aa38SMilan Broz * There was a data integrity error. 1626ef43aa38SMilan Broz */ 1627ef43aa38SMilan Broz case -EBADMSG: 1628ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 16294e4cbee9SChristoph Hellwig return BLK_STS_PROTECTION; 1630ef43aa38SMilan Broz /* 1631ef43aa38SMilan Broz * There was an error while processing the request. 1632ef43aa38SMilan Broz */ 16333f1e9070SMilan Broz default: 163440b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 16354e4cbee9SChristoph Hellwig return BLK_STS_IOERR; 16361da177e4SLinus Torvalds } 16373f1e9070SMilan Broz } 16383f1e9070SMilan Broz 16393f1e9070SMilan Broz return 0; 16403f1e9070SMilan Broz } 16411da177e4SLinus Torvalds 1642cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1643cf2f1abfSMikulas Patocka 16441da177e4SLinus Torvalds /* 16451da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1646586b286bSMike Snitzer * This should never violate the device limitations (but only because 1647586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 16487145c241SMikulas Patocka * 16497145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 16507145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 16517145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 16527145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 16537145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 16547145c241SMikulas Patocka * 16557145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 16567145c241SMikulas Patocka * 16577145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 16587145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 16597145c241SMikulas Patocka * to blocking allocations with a mutex. 16601da177e4SLinus Torvalds */ 1661cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 16621da177e4SLinus Torvalds { 166349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16648b004457SMilan Broz struct bio *clone; 16651da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 16667145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 16677145c241SMikulas Patocka unsigned i, len, remaining_size; 166891e10625SMilan Broz struct page *page; 16691da177e4SLinus Torvalds 16707145c241SMikulas Patocka retry: 1671d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 16727145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 16737145c241SMikulas Patocka 16746f1c819cSKent Overstreet clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs); 16758b004457SMilan Broz if (!clone) 1676ef43aa38SMilan Broz goto out; 16771da177e4SLinus Torvalds 1678027581f3SOlaf Kirch clone_init(io, clone); 16796a24c718SMilan Broz 16807145c241SMikulas Patocka remaining_size = size; 16817145c241SMikulas Patocka 1682f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 16836f1c819cSKent Overstreet page = mempool_alloc(&cc->page_pool, gfp_mask); 16847145c241SMikulas Patocka if (!page) { 16857145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 16867145c241SMikulas Patocka bio_put(clone); 1687d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 16887145c241SMikulas Patocka goto retry; 16897145c241SMikulas Patocka } 16901da177e4SLinus Torvalds 16917145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 16921da177e4SLinus Torvalds 16930dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 169491e10625SMilan Broz 16957145c241SMikulas Patocka remaining_size -= len; 16961da177e4SLinus Torvalds } 16971da177e4SLinus Torvalds 1698ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1699ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1700ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1701ef43aa38SMilan Broz bio_put(clone); 1702ef43aa38SMilan Broz clone = NULL; 1703ef43aa38SMilan Broz } 1704ef43aa38SMilan Broz out: 1705d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 17067145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 17077145c241SMikulas Patocka 17088b004457SMilan Broz return clone; 17091da177e4SLinus Torvalds } 17101da177e4SLinus Torvalds 1711644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 17121da177e4SLinus Torvalds { 17131da177e4SLinus Torvalds struct bio_vec *bv; 17146dc4f100SMing Lei struct bvec_iter_all iter_all; 17151da177e4SLinus Torvalds 17162b070cfeSChristoph Hellwig bio_for_each_segment_all(bv, clone, iter_all) { 17171da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 17186f1c819cSKent Overstreet mempool_free(bv->bv_page, &cc->page_pool); 17191da177e4SLinus Torvalds } 17201da177e4SLinus Torvalds } 17211da177e4SLinus Torvalds 1722298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1723dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1724dc440d1eSMilan Broz { 172549a8a920SAlasdair G Kergon io->cc = cc; 1726dc440d1eSMilan Broz io->base_bio = bio; 1727dc440d1eSMilan Broz io->sector = sector; 1728dc440d1eSMilan Broz io->error = 0; 1729ef43aa38SMilan Broz io->ctx.r.req = NULL; 1730ef43aa38SMilan Broz io->integrity_metadata = NULL; 1731ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 173240b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1733dc440d1eSMilan Broz } 1734dc440d1eSMilan Broz 17353e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 17363e1a8bddSMilan Broz { 173740b6229bSMikulas Patocka atomic_inc(&io->io_pending); 17383e1a8bddSMilan Broz } 17393e1a8bddSMilan Broz 17408e14f610SIgnat Korchagin static void kcryptd_io_bio_endio(struct work_struct *work) 17418e14f610SIgnat Korchagin { 17428e14f610SIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 17438e14f610SIgnat Korchagin bio_endio(io->base_bio); 17448e14f610SIgnat Korchagin } 17458e14f610SIgnat Korchagin 17461da177e4SLinus Torvalds /* 17471da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 17481da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 17491da177e4SLinus Torvalds */ 17505742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 17511da177e4SLinus Torvalds { 175249a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1753b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 17544e4cbee9SChristoph Hellwig blk_status_t error = io->error; 17551da177e4SLinus Torvalds 175640b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 17571da177e4SLinus Torvalds return; 17581da177e4SLinus Torvalds 1759ef43aa38SMilan Broz if (io->ctx.r.req) 1760ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1761ef43aa38SMilan Broz 1762ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 17636f1c819cSKent Overstreet mempool_free(io->integrity_metadata, &io->cc->tag_pool); 1764ef43aa38SMilan Broz else 1765ef43aa38SMilan Broz kfree(io->integrity_metadata); 1766b35f8caaSMilan Broz 17674e4cbee9SChristoph Hellwig base_bio->bi_status = error; 17688e14f610SIgnat Korchagin 17698e14f610SIgnat Korchagin /* 17708e14f610SIgnat Korchagin * If we are running this function from our tasklet, 17718e14f610SIgnat Korchagin * we can't call bio_endio() here, because it will call 17728e14f610SIgnat Korchagin * clone_endio() from dm.c, which in turn will 17738e14f610SIgnat Korchagin * free the current struct dm_crypt_io structure with 17748e14f610SIgnat Korchagin * our tasklet. In this case we need to delay bio_endio() 17758e14f610SIgnat Korchagin * execution to after the tasklet is done and dequeued. 17768e14f610SIgnat Korchagin */ 17778e14f610SIgnat Korchagin if (tasklet_trylock(&io->tasklet)) { 17788e14f610SIgnat Korchagin tasklet_unlock(&io->tasklet); 17794246a0b6SChristoph Hellwig bio_endio(base_bio); 17808e14f610SIgnat Korchagin return; 17818e14f610SIgnat Korchagin } 17828e14f610SIgnat Korchagin 17838e14f610SIgnat Korchagin INIT_WORK(&io->work, kcryptd_io_bio_endio); 17848e14f610SIgnat Korchagin queue_work(cc->io_queue, &io->work); 17851da177e4SLinus Torvalds } 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds /* 1788cabf08e4SMilan Broz * kcryptd/kcryptd_io: 17891da177e4SLinus Torvalds * 17901da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 179123541d2dSMilan Broz * interrupt context. 1792cabf08e4SMilan Broz * 1793cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1794cabf08e4SMilan Broz * 1795cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1796cabf08e4SMilan Broz * 1797cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1798cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1799cabf08e4SMilan Broz * to memory allocation. 1800c0297721SAndi Kleen * 1801c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1802c0297721SAndi Kleen * They should not depend on each other and do not block. 18031da177e4SLinus Torvalds */ 18044246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 18058b004457SMilan Broz { 1806028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 180749a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1808ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 18094e4cbee9SChristoph Hellwig blk_status_t error; 18108b004457SMilan Broz 18118b004457SMilan Broz /* 18126712ecf8SNeilBrown * free the processed pages 18138b004457SMilan Broz */ 1814ee7a491eSMilan Broz if (rw == WRITE) 1815644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 18168b004457SMilan Broz 18174e4cbee9SChristoph Hellwig error = clone->bi_status; 18188b004457SMilan Broz bio_put(clone); 1819ee7a491eSMilan Broz 18209b81c842SSasha Levin if (rw == READ && !error) { 1821cabf08e4SMilan Broz kcryptd_queue_crypt(io); 18226712ecf8SNeilBrown return; 1823ee7a491eSMilan Broz } 18245742fd77SMilan Broz 18259b81c842SSasha Levin if (unlikely(error)) 18269b81c842SSasha Levin io->error = error; 18275742fd77SMilan Broz 18285742fd77SMilan Broz crypt_dec_pending(io); 18298b004457SMilan Broz } 18308b004457SMilan Broz 1831028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 18328b004457SMilan Broz { 183349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 18348b004457SMilan Broz 18358b004457SMilan Broz clone->bi_private = io; 18368b004457SMilan Broz clone->bi_end_io = crypt_endio; 183774d46992SChristoph Hellwig bio_set_dev(clone, cc->dev->bdev); 1838ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 18398b004457SMilan Broz } 18408b004457SMilan Broz 184120c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 18428b004457SMilan Broz { 184349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 18448b004457SMilan Broz struct bio *clone; 184593e605c2SMilan Broz 18468b004457SMilan Broz /* 184759779079SMike Snitzer * We need the original biovec array in order to decrypt 184859779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 184959779079SMike Snitzer * biovecs we don't need to worry about the block layer 185059779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 18518b004457SMilan Broz */ 18526f1c819cSKent Overstreet clone = bio_clone_fast(io->base_bio, gfp, &cc->bs); 18537eaceaccSJens Axboe if (!clone) 185420c82538SMilan Broz return 1; 18558b004457SMilan Broz 185620c82538SMilan Broz crypt_inc_pending(io); 185720c82538SMilan Broz 18588b004457SMilan Broz clone_init(io, clone); 18594f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 18608b004457SMilan Broz 1861ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1862ef43aa38SMilan Broz crypt_dec_pending(io); 1863ef43aa38SMilan Broz bio_put(clone); 1864ef43aa38SMilan Broz return 1; 1865ef43aa38SMilan Broz } 1866ef43aa38SMilan Broz 1867ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 186820c82538SMilan Broz return 0; 18698b004457SMilan Broz } 18708b004457SMilan Broz 1871dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1872395b167cSAlasdair G Kergon { 1873395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1874395b167cSAlasdair G Kergon 187520c82538SMilan Broz crypt_inc_pending(io); 187620c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 18774e4cbee9SChristoph Hellwig io->error = BLK_STS_RESOURCE; 187820c82538SMilan Broz crypt_dec_pending(io); 1879395b167cSAlasdair G Kergon } 1880395b167cSAlasdair G Kergon 1881dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1882395b167cSAlasdair G Kergon { 188349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1884395b167cSAlasdair G Kergon 1885dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1886395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1887395b167cSAlasdair G Kergon } 1888395b167cSAlasdair G Kergon 1889dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1890dc267621SMikulas Patocka { 1891dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1892dc267621SMikulas Patocka 1893ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 1894dc267621SMikulas Patocka } 1895dc267621SMikulas Patocka 1896b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1897b3c5fd30SMikulas Patocka 1898dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1899dc267621SMikulas Patocka { 1900dc267621SMikulas Patocka struct crypt_config *cc = data; 1901b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1902b3c5fd30SMikulas Patocka 1903dc267621SMikulas Patocka while (1) { 1904b3c5fd30SMikulas Patocka struct rb_root write_tree; 1905dc267621SMikulas Patocka struct blk_plug plug; 1906dc267621SMikulas Patocka 1907c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1908dc267621SMikulas Patocka continue_locked: 1909dc267621SMikulas Patocka 1910b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1911dc267621SMikulas Patocka goto pop_from_list; 1912dc267621SMikulas Patocka 1913f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1914dc267621SMikulas Patocka 1915c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1916dc267621SMikulas Patocka 1917f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1918642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1919f659b100SRabin Vincent break; 1920f659b100SRabin Vincent } 1921f659b100SRabin Vincent 1922dc267621SMikulas Patocka schedule(); 1923dc267621SMikulas Patocka 1924642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1925c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1926dc267621SMikulas Patocka goto continue_locked; 1927dc267621SMikulas Patocka 1928dc267621SMikulas Patocka pop_from_list: 1929b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1930b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1931c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1932dc267621SMikulas Patocka 1933b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1934b3c5fd30SMikulas Patocka 1935b3c5fd30SMikulas Patocka /* 1936b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1937b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1938b3c5fd30SMikulas Patocka */ 1939dc267621SMikulas Patocka blk_start_plug(&plug); 1940dc267621SMikulas Patocka do { 1941b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1942b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1943dc267621SMikulas Patocka kcryptd_io_write(io); 1944b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1945dc267621SMikulas Patocka blk_finish_plug(&plug); 1946dc267621SMikulas Patocka } 1947dc267621SMikulas Patocka return 0; 1948dc267621SMikulas Patocka } 1949dc267621SMikulas Patocka 195072c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 19514e4eef64SMilan Broz { 1952dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 195349a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1954dc267621SMikulas Patocka unsigned long flags; 1955b3c5fd30SMikulas Patocka sector_t sector; 1956b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1957dec1cedfSMilan Broz 19584e4cbee9SChristoph Hellwig if (unlikely(io->error)) { 1959dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1960dec1cedfSMilan Broz bio_put(clone); 19616c031f41SMilan Broz crypt_dec_pending(io); 1962dec1cedfSMilan Broz return; 1963dec1cedfSMilan Broz } 1964dec1cedfSMilan Broz 1965dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1966003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1967dec1cedfSMilan Broz 19684f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1969899c95d3SMilan Broz 197039d42fa9SIgnat Korchagin if ((likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) || 197139d42fa9SIgnat Korchagin test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) { 1972ed00aabdSChristoph Hellwig submit_bio_noacct(clone); 19730f5d8e6eSMikulas Patocka return; 19740f5d8e6eSMikulas Patocka } 19750f5d8e6eSMikulas Patocka 1976c7329effSMikulas Patocka spin_lock_irqsave(&cc->write_thread_lock, flags); 1977c7329effSMikulas Patocka if (RB_EMPTY_ROOT(&cc->write_tree)) 1978c7329effSMikulas Patocka wake_up_process(cc->write_thread); 1979b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1980b3c5fd30SMikulas Patocka parent = NULL; 1981b3c5fd30SMikulas Patocka sector = io->sector; 1982b3c5fd30SMikulas Patocka while (*rbp) { 1983b3c5fd30SMikulas Patocka parent = *rbp; 1984b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1985b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1986b3c5fd30SMikulas Patocka else 1987b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1988b3c5fd30SMikulas Patocka } 1989b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1990b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1991c7329effSMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_lock, flags); 19924e4eef64SMilan Broz } 19934e4eef64SMilan Broz 19948e225f04SDamien Le Moal static bool kcryptd_crypt_write_inline(struct crypt_config *cc, 19958e225f04SDamien Le Moal struct convert_context *ctx) 19968e225f04SDamien Le Moal 19978e225f04SDamien Le Moal { 19988e225f04SDamien Le Moal if (!test_bit(DM_CRYPT_WRITE_INLINE, &cc->flags)) 19998e225f04SDamien Le Moal return false; 20008e225f04SDamien Le Moal 20018e225f04SDamien Le Moal /* 20028e225f04SDamien Le Moal * Note: zone append writes (REQ_OP_ZONE_APPEND) do not have ordering 20038e225f04SDamien Le Moal * constraints so they do not need to be issued inline by 20048e225f04SDamien Le Moal * kcryptd_crypt_write_convert(). 20058e225f04SDamien Le Moal */ 20068e225f04SDamien Le Moal switch (bio_op(ctx->bio_in)) { 20078e225f04SDamien Le Moal case REQ_OP_WRITE: 20088e225f04SDamien Le Moal case REQ_OP_WRITE_SAME: 20098e225f04SDamien Le Moal case REQ_OP_WRITE_ZEROES: 20108e225f04SDamien Le Moal return true; 20118e225f04SDamien Le Moal default: 20128e225f04SDamien Le Moal return false; 20138e225f04SDamien Le Moal } 20148e225f04SDamien Le Moal } 20158e225f04SDamien Le Moal 20168abec36dSIgnat Korchagin static void kcryptd_crypt_write_continue(struct work_struct *work) 20178abec36dSIgnat Korchagin { 20188abec36dSIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 20198abec36dSIgnat Korchagin struct crypt_config *cc = io->cc; 20208abec36dSIgnat Korchagin struct convert_context *ctx = &io->ctx; 20218abec36dSIgnat Korchagin int crypt_finished; 20228abec36dSIgnat Korchagin sector_t sector = io->sector; 20238abec36dSIgnat Korchagin blk_status_t r; 20248abec36dSIgnat Korchagin 20258abec36dSIgnat Korchagin wait_for_completion(&ctx->restart); 20268abec36dSIgnat Korchagin reinit_completion(&ctx->restart); 20278abec36dSIgnat Korchagin 20288abec36dSIgnat Korchagin r = crypt_convert(cc, &io->ctx, true, false); 20298abec36dSIgnat Korchagin if (r) 20308abec36dSIgnat Korchagin io->error = r; 20318abec36dSIgnat Korchagin crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 20328abec36dSIgnat Korchagin if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 20338abec36dSIgnat Korchagin /* Wait for completion signaled by kcryptd_async_done() */ 20348abec36dSIgnat Korchagin wait_for_completion(&ctx->restart); 20358abec36dSIgnat Korchagin crypt_finished = 1; 20368abec36dSIgnat Korchagin } 20378abec36dSIgnat Korchagin 20388abec36dSIgnat Korchagin /* Encryption was already finished, submit io now */ 20398abec36dSIgnat Korchagin if (crypt_finished) { 20408abec36dSIgnat Korchagin kcryptd_crypt_write_io_submit(io, 0); 20418abec36dSIgnat Korchagin io->sector = sector; 20428abec36dSIgnat Korchagin } 20438abec36dSIgnat Korchagin 20448abec36dSIgnat Korchagin crypt_dec_pending(io); 20458abec36dSIgnat Korchagin } 20468abec36dSIgnat Korchagin 2047fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 20488b004457SMilan Broz { 204949a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 20508e225f04SDamien Le Moal struct convert_context *ctx = &io->ctx; 20518b004457SMilan Broz struct bio *clone; 2052c8081618SMilan Broz int crypt_finished; 2053b635b00eSMilan Broz sector_t sector = io->sector; 20544e4cbee9SChristoph Hellwig blk_status_t r; 20558b004457SMilan Broz 205693e605c2SMilan Broz /* 2057fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 2058fc5a5e9aSMilan Broz */ 2059fc5a5e9aSMilan Broz crypt_inc_pending(io); 20608e225f04SDamien Le Moal crypt_convert_init(cc, ctx, NULL, io->base_bio, sector); 2061fc5a5e9aSMilan Broz 2062cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 206323541d2dSMilan Broz if (unlikely(!clone)) { 20644e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 2065cf2f1abfSMikulas Patocka goto dec; 206623541d2dSMilan Broz } 20678b004457SMilan Broz 206853017030SMilan Broz io->ctx.bio_out = clone; 2069003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 20708b004457SMilan Broz 2071b635b00eSMilan Broz sector += bio_sectors(clone); 2072dec1cedfSMilan Broz 20734e594098SMilan Broz crypt_inc_pending(io); 20748e225f04SDamien Le Moal r = crypt_convert(cc, ctx, 20758abec36dSIgnat Korchagin test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags), true); 20768abec36dSIgnat Korchagin /* 20778abec36dSIgnat Korchagin * Crypto API backlogged the request, because its queue was full 20788abec36dSIgnat Korchagin * and we're in softirq context, so continue from a workqueue 20798abec36dSIgnat Korchagin * (TODO: is it actually possible to be in softirq in the write path?) 20808abec36dSIgnat Korchagin */ 20818abec36dSIgnat Korchagin if (r == BLK_STS_DEV_RESOURCE) { 20828abec36dSIgnat Korchagin INIT_WORK(&io->work, kcryptd_crypt_write_continue); 20838abec36dSIgnat Korchagin queue_work(cc->crypt_queue, &io->work); 20848abec36dSIgnat Korchagin return; 20858abec36dSIgnat Korchagin } 20864e4cbee9SChristoph Hellwig if (r) 2087ef43aa38SMilan Broz io->error = r; 20888e225f04SDamien Le Moal crypt_finished = atomic_dec_and_test(&ctx->cc_pending); 20898e225f04SDamien Le Moal if (!crypt_finished && kcryptd_crypt_write_inline(cc, ctx)) { 20908e225f04SDamien Le Moal /* Wait for completion signaled by kcryptd_async_done() */ 20918e225f04SDamien Le Moal wait_for_completion(&ctx->restart); 20928e225f04SDamien Le Moal crypt_finished = 1; 20938e225f04SDamien Le Moal } 2094dec1cedfSMilan Broz 2095c8081618SMilan Broz /* Encryption was already finished, submit io now */ 2096c8081618SMilan Broz if (crypt_finished) { 209772c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 2098b635b00eSMilan Broz io->sector = sector; 20994e594098SMilan Broz } 210093e605c2SMilan Broz 2101cf2f1abfSMikulas Patocka dec: 2102899c95d3SMilan Broz crypt_dec_pending(io); 210384131db6SMilan Broz } 210484131db6SMilan Broz 210572c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 21065742fd77SMilan Broz { 21075742fd77SMilan Broz crypt_dec_pending(io); 21085742fd77SMilan Broz } 21095742fd77SMilan Broz 21108abec36dSIgnat Korchagin static void kcryptd_crypt_read_continue(struct work_struct *work) 21118abec36dSIgnat Korchagin { 21128abec36dSIgnat Korchagin struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 21138abec36dSIgnat Korchagin struct crypt_config *cc = io->cc; 21148abec36dSIgnat Korchagin blk_status_t r; 21158abec36dSIgnat Korchagin 21168abec36dSIgnat Korchagin wait_for_completion(&io->ctx.restart); 21178abec36dSIgnat Korchagin reinit_completion(&io->ctx.restart); 21188abec36dSIgnat Korchagin 21198abec36dSIgnat Korchagin r = crypt_convert(cc, &io->ctx, true, false); 21208abec36dSIgnat Korchagin if (r) 21218abec36dSIgnat Korchagin io->error = r; 21228abec36dSIgnat Korchagin 21238abec36dSIgnat Korchagin if (atomic_dec_and_test(&io->ctx.cc_pending)) 21248abec36dSIgnat Korchagin kcryptd_crypt_read_done(io); 21258abec36dSIgnat Korchagin 21268abec36dSIgnat Korchagin crypt_dec_pending(io); 21278abec36dSIgnat Korchagin } 21288abec36dSIgnat Korchagin 21294e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 21308b004457SMilan Broz { 213149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 21324e4cbee9SChristoph Hellwig blk_status_t r; 21338b004457SMilan Broz 21343e1a8bddSMilan Broz crypt_inc_pending(io); 21353a7f6c99SMilan Broz 213653017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 21370c395b0fSMilan Broz io->sector); 21388b004457SMilan Broz 213939d42fa9SIgnat Korchagin r = crypt_convert(cc, &io->ctx, 21408abec36dSIgnat Korchagin test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags), true); 21418abec36dSIgnat Korchagin /* 21428abec36dSIgnat Korchagin * Crypto API backlogged the request, because its queue was full 21438abec36dSIgnat Korchagin * and we're in softirq context, so continue from a workqueue 21448abec36dSIgnat Korchagin */ 21458abec36dSIgnat Korchagin if (r == BLK_STS_DEV_RESOURCE) { 21468abec36dSIgnat Korchagin INIT_WORK(&io->work, kcryptd_crypt_read_continue); 21478abec36dSIgnat Korchagin queue_work(cc->crypt_queue, &io->work); 21488abec36dSIgnat Korchagin return; 21498abec36dSIgnat Korchagin } 21504e4cbee9SChristoph Hellwig if (r) 2151ef43aa38SMilan Broz io->error = r; 21525742fd77SMilan Broz 215340b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 215472c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 21553a7f6c99SMilan Broz 21563a7f6c99SMilan Broz crypt_dec_pending(io); 21578b004457SMilan Broz } 21588b004457SMilan Broz 215995497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 216095497a96SMilan Broz int error) 216195497a96SMilan Broz { 2162b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 2163b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 216495497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 216549a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 216695497a96SMilan Broz 216754cea3f6SMilan Broz /* 216854cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 216954cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 217054cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 217154cea3f6SMilan Broz */ 2172c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 2173c0403ec0SRabin Vincent complete(&ctx->restart); 217495497a96SMilan Broz return; 2175c0403ec0SRabin Vincent } 217695497a96SMilan Broz 21772dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 2178ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 21792dc5327dSMilan Broz 2180ef43aa38SMilan Broz if (error == -EBADMSG) { 2181f710126cSMilan Broz char b[BDEVNAME_SIZE]; 218258d0f180SMichael Weiß sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)); 218358d0f180SMichael Weiß 218458d0f180SMichael Weiß DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", 218558d0f180SMichael Weiß bio_devname(ctx->bio_in, b), s); 218658d0f180SMichael Weiß dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", 218758d0f180SMichael Weiß ctx->bio_in, s, 0); 21884e4cbee9SChristoph Hellwig io->error = BLK_STS_PROTECTION; 2189ef43aa38SMilan Broz } else if (error < 0) 21904e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 219172c6e7afSMikulas Patocka 2192298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 219395497a96SMilan Broz 219440b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 2195c0403ec0SRabin Vincent return; 219695497a96SMilan Broz 21978e225f04SDamien Le Moal /* 21988e225f04SDamien Le Moal * The request is fully completed: for inline writes, let 21998e225f04SDamien Le Moal * kcryptd_crypt_write_convert() do the IO submission. 22008e225f04SDamien Le Moal */ 22018e225f04SDamien Le Moal if (bio_data_dir(io->base_bio) == READ) { 220272c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 22038e225f04SDamien Le Moal return; 22048e225f04SDamien Le Moal } 22058e225f04SDamien Le Moal 22068e225f04SDamien Le Moal if (kcryptd_crypt_write_inline(cc, ctx)) { 22078e225f04SDamien Le Moal complete(&ctx->restart); 22088e225f04SDamien Le Moal return; 22098e225f04SDamien Le Moal } 22108e225f04SDamien Le Moal 221172c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 221295497a96SMilan Broz } 221395497a96SMilan Broz 22144e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 22154e4eef64SMilan Broz { 22164e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 22174e4eef64SMilan Broz 22184e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 22194e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 22204e4eef64SMilan Broz else 22214e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 22228b004457SMilan Broz } 22238b004457SMilan Broz 222439d42fa9SIgnat Korchagin static void kcryptd_crypt_tasklet(unsigned long work) 222539d42fa9SIgnat Korchagin { 222639d42fa9SIgnat Korchagin kcryptd_crypt((struct work_struct *)work); 222739d42fa9SIgnat Korchagin } 222839d42fa9SIgnat Korchagin 2229395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 2230395b167cSAlasdair G Kergon { 223149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 2232395b167cSAlasdair G Kergon 223339d42fa9SIgnat Korchagin if ((bio_data_dir(io->base_bio) == READ && test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) || 223439d42fa9SIgnat Korchagin (bio_data_dir(io->base_bio) == WRITE && test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags))) { 2235c87a95dcSIgnat Korchagin /* 2236d3703ef3SChangbin Du * in_hardirq(): Crypto API's skcipher_walk_first() refuses to work in hard IRQ context. 2237c87a95dcSIgnat Korchagin * irqs_disabled(): the kernel may run some IO completion from the idle thread, but 2238c87a95dcSIgnat Korchagin * it is being executed with irqs disabled. 2239c87a95dcSIgnat Korchagin */ 2240d3703ef3SChangbin Du if (in_hardirq() || irqs_disabled()) { 224139d42fa9SIgnat Korchagin tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work); 224239d42fa9SIgnat Korchagin tasklet_schedule(&io->tasklet); 224339d42fa9SIgnat Korchagin return; 224439d42fa9SIgnat Korchagin } 224539d42fa9SIgnat Korchagin 224639d42fa9SIgnat Korchagin kcryptd_crypt(&io->work); 224739d42fa9SIgnat Korchagin return; 224839d42fa9SIgnat Korchagin } 224939d42fa9SIgnat Korchagin 2250395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 2251395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 2252395b167cSAlasdair G Kergon } 2253395b167cSAlasdair G Kergon 2254ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 22551da177e4SLinus Torvalds { 2256ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 2257ef43aa38SMilan Broz return; 22581da177e4SLinus Torvalds 2259ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2260ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 2261ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 22621da177e4SLinus Torvalds } 22631da177e4SLinus Torvalds 2264ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 2265ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 2266ef43aa38SMilan Broz } 22671da177e4SLinus Torvalds 2268ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 2269d1f96423SMilan Broz { 2270d1f96423SMilan Broz unsigned i; 2271d1f96423SMilan Broz 2272ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2273fd2d231fSMikulas Patocka return; 2274fd2d231fSMikulas Patocka 2275d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 2276ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 2277ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 2278ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 2279d1f96423SMilan Broz } 2280d1f96423SMilan Broz 2281ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 2282ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 22831da177e4SLinus Torvalds } 22841da177e4SLinus Torvalds 22851da177e4SLinus Torvalds static void crypt_free_tfms(struct crypt_config *cc) 2286d1f96423SMilan Broz { 228733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2288ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 2289ef43aa38SMilan Broz else 2290ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 2291d1f96423SMilan Broz } 2292d1f96423SMilan Broz 2293ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 2294d1f96423SMilan Broz { 2295d1f96423SMilan Broz unsigned i; 2296d1f96423SMilan Broz int err; 2297d1f96423SMilan Broz 22986396bb22SKees Cook cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, 22996396bb22SKees Cook sizeof(struct crypto_skcipher *), 23006396bb22SKees Cook GFP_KERNEL); 2301ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2302fd2d231fSMikulas Patocka return -ENOMEM; 2303fd2d231fSMikulas Patocka 2304d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 2305cd746938SMikulas Patocka cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 2306cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 2307ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 2308ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 2309fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2310d1f96423SMilan Broz return err; 2311d1f96423SMilan Broz } 2312d1f96423SMilan Broz } 2313d1f96423SMilan Broz 2314af331ebaSEric Biggers /* 2315af331ebaSEric Biggers * dm-crypt performance can vary greatly depending on which crypto 2316af331ebaSEric Biggers * algorithm implementation is used. Help people debug performance 2317af331ebaSEric Biggers * problems by logging the ->cra_driver_name. 2318af331ebaSEric Biggers */ 23197a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2320af331ebaSEric Biggers crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); 2321d1f96423SMilan Broz return 0; 2322d1f96423SMilan Broz } 2323d1f96423SMilan Broz 2324ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 2325ef43aa38SMilan Broz { 2326ef43aa38SMilan Broz int err; 2327ef43aa38SMilan Broz 2328ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 2329ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2330ef43aa38SMilan Broz return -ENOMEM; 2331ef43aa38SMilan Broz 2332cd746938SMikulas Patocka cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 2333cd746938SMikulas Patocka CRYPTO_ALG_ALLOCATES_MEMORY); 2334ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2335ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 2336ef43aa38SMilan Broz crypt_free_tfms(cc); 2337ef43aa38SMilan Broz return err; 2338ef43aa38SMilan Broz } 2339ef43aa38SMilan Broz 23407a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2341af331ebaSEric Biggers crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); 2342ef43aa38SMilan Broz return 0; 2343ef43aa38SMilan Broz } 2344ef43aa38SMilan Broz 2345ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 2346ef43aa38SMilan Broz { 234733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2348ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 2349ef43aa38SMilan Broz else 2350ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 2351ef43aa38SMilan Broz } 2352ef43aa38SMilan Broz 2353ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 2354ef43aa38SMilan Broz { 2355ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 2356ef43aa38SMilan Broz } 2357ef43aa38SMilan Broz 2358ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 2359ef43aa38SMilan Broz { 2360ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 2361ef43aa38SMilan Broz } 2362ef43aa38SMilan Broz 2363ef43aa38SMilan Broz /* 2364ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 2365ef43aa38SMilan Broz * the key must be for some reason in special format. 2366ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 2367ef43aa38SMilan Broz */ 2368ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 2369ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 2370ef43aa38SMilan Broz { 2371ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 2372ef43aa38SMilan Broz struct rtattr *rta; 2373ef43aa38SMilan Broz 2374ef43aa38SMilan Broz rta = (struct rtattr *)p; 2375ef43aa38SMilan Broz param = RTA_DATA(rta); 2376ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 2377ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 2378ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 2379ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 2380ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 2381ef43aa38SMilan Broz p += authkeylen; 2382ef43aa38SMilan Broz memcpy(p, key, enckeylen); 2383ef43aa38SMilan Broz } 2384ef43aa38SMilan Broz 2385671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 2386c0297721SAndi Kleen { 2387da31a078SMilan Broz unsigned subkey_size; 2388fd2d231fSMikulas Patocka int err = 0, i, r; 2389c0297721SAndi Kleen 2390da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 2391ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 2392da31a078SMilan Broz 239327c70036SMilan Broz if (crypt_integrity_hmac(cc)) { 239427c70036SMilan Broz if (subkey_size < cc->key_mac_size) 239527c70036SMilan Broz return -EINVAL; 239627c70036SMilan Broz 2397ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 2398ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 2399ef43aa38SMilan Broz cc->key_mac_size); 240027c70036SMilan Broz } 240127c70036SMilan Broz 2402d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 240333d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) 240433d2f09fSMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 240533d2f09fSMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 240633d2f09fSMilan Broz else if (crypt_integrity_aead(cc)) 2407ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2408ef43aa38SMilan Broz cc->key + (i * subkey_size), 2409ef43aa38SMilan Broz subkey_size); 2410ef43aa38SMilan Broz else 2411ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 2412fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 2413fd2d231fSMikulas Patocka subkey_size); 2414c0297721SAndi Kleen if (r) 2415c0297721SAndi Kleen err = r; 2416c0297721SAndi Kleen } 2417c0297721SAndi Kleen 2418ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 2419ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 2420ef43aa38SMilan Broz 2421c0297721SAndi Kleen return err; 2422c0297721SAndi Kleen } 2423c0297721SAndi Kleen 2424c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 2425c538f6ecSOndrej Kozina 2426027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 2427027c431cSOndrej Kozina { 2428027c431cSOndrej Kozina while (*str) 2429027c431cSOndrej Kozina if (isspace(*str++)) 2430027c431cSOndrej Kozina return true; 2431027c431cSOndrej Kozina return false; 2432027c431cSOndrej Kozina } 2433027c431cSOndrej Kozina 243427f5411aSDmitry Baryshkov static int set_key_user(struct crypt_config *cc, struct key *key) 243527f5411aSDmitry Baryshkov { 243627f5411aSDmitry Baryshkov const struct user_key_payload *ukp; 243727f5411aSDmitry Baryshkov 243827f5411aSDmitry Baryshkov ukp = user_key_payload_locked(key); 243927f5411aSDmitry Baryshkov if (!ukp) 244027f5411aSDmitry Baryshkov return -EKEYREVOKED; 244127f5411aSDmitry Baryshkov 244227f5411aSDmitry Baryshkov if (cc->key_size != ukp->datalen) 244327f5411aSDmitry Baryshkov return -EINVAL; 244427f5411aSDmitry Baryshkov 244527f5411aSDmitry Baryshkov memcpy(cc->key, ukp->data, cc->key_size); 244627f5411aSDmitry Baryshkov 244727f5411aSDmitry Baryshkov return 0; 244827f5411aSDmitry Baryshkov } 244927f5411aSDmitry Baryshkov 245027f5411aSDmitry Baryshkov static int set_key_encrypted(struct crypt_config *cc, struct key *key) 245127f5411aSDmitry Baryshkov { 245227f5411aSDmitry Baryshkov const struct encrypted_key_payload *ekp; 245327f5411aSDmitry Baryshkov 245427f5411aSDmitry Baryshkov ekp = key->payload.data[0]; 245527f5411aSDmitry Baryshkov if (!ekp) 245627f5411aSDmitry Baryshkov return -EKEYREVOKED; 245727f5411aSDmitry Baryshkov 245827f5411aSDmitry Baryshkov if (cc->key_size != ekp->decrypted_datalen) 245927f5411aSDmitry Baryshkov return -EINVAL; 246027f5411aSDmitry Baryshkov 246127f5411aSDmitry Baryshkov memcpy(cc->key, ekp->decrypted_data, cc->key_size); 246227f5411aSDmitry Baryshkov 246327f5411aSDmitry Baryshkov return 0; 246427f5411aSDmitry Baryshkov } 246527f5411aSDmitry Baryshkov 2466363880c4SAhmad Fatoum static int set_key_trusted(struct crypt_config *cc, struct key *key) 2467363880c4SAhmad Fatoum { 2468363880c4SAhmad Fatoum const struct trusted_key_payload *tkp; 2469363880c4SAhmad Fatoum 2470363880c4SAhmad Fatoum tkp = key->payload.data[0]; 2471363880c4SAhmad Fatoum if (!tkp) 2472363880c4SAhmad Fatoum return -EKEYREVOKED; 2473363880c4SAhmad Fatoum 2474363880c4SAhmad Fatoum if (cc->key_size != tkp->key_len) 2475363880c4SAhmad Fatoum return -EINVAL; 2476363880c4SAhmad Fatoum 2477363880c4SAhmad Fatoum memcpy(cc->key, tkp->key, cc->key_size); 2478363880c4SAhmad Fatoum 2479363880c4SAhmad Fatoum return 0; 2480363880c4SAhmad Fatoum } 2481363880c4SAhmad Fatoum 2482c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2483c538f6ecSOndrej Kozina { 2484c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 2485c538f6ecSOndrej Kozina int ret; 248627f5411aSDmitry Baryshkov struct key_type *type; 2487c538f6ecSOndrej Kozina struct key *key; 248827f5411aSDmitry Baryshkov int (*set_key)(struct crypt_config *cc, struct key *key); 2489c538f6ecSOndrej Kozina 2490027c431cSOndrej Kozina /* 2491027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 2492027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2493027c431cSOndrej Kozina */ 2494027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 2495027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 2496027c431cSOndrej Kozina return -EINVAL; 2497027c431cSOndrej Kozina } 2498027c431cSOndrej Kozina 2499c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 2500c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 2501c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2502c538f6ecSOndrej Kozina return -EINVAL; 2503c538f6ecSOndrej Kozina 250427f5411aSDmitry Baryshkov if (!strncmp(key_string, "logon:", key_desc - key_string + 1)) { 250527f5411aSDmitry Baryshkov type = &key_type_logon; 250627f5411aSDmitry Baryshkov set_key = set_key_user; 250727f5411aSDmitry Baryshkov } else if (!strncmp(key_string, "user:", key_desc - key_string + 1)) { 250827f5411aSDmitry Baryshkov type = &key_type_user; 250927f5411aSDmitry Baryshkov set_key = set_key_user; 2510831475ccSAhmad Fatoum } else if (IS_ENABLED(CONFIG_ENCRYPTED_KEYS) && 2511831475ccSAhmad Fatoum !strncmp(key_string, "encrypted:", key_desc - key_string + 1)) { 251227f5411aSDmitry Baryshkov type = &key_type_encrypted; 251327f5411aSDmitry Baryshkov set_key = set_key_encrypted; 2514363880c4SAhmad Fatoum } else if (IS_ENABLED(CONFIG_TRUSTED_KEYS) && 2515363880c4SAhmad Fatoum !strncmp(key_string, "trusted:", key_desc - key_string + 1)) { 2516363880c4SAhmad Fatoum type = &key_type_trusted; 2517363880c4SAhmad Fatoum set_key = set_key_trusted; 251827f5411aSDmitry Baryshkov } else { 2519c538f6ecSOndrej Kozina return -EINVAL; 252027f5411aSDmitry Baryshkov } 2521c538f6ecSOndrej Kozina 2522c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2523c538f6ecSOndrej Kozina if (!new_key_string) 2524c538f6ecSOndrej Kozina return -ENOMEM; 2525c538f6ecSOndrej Kozina 252627f5411aSDmitry Baryshkov key = request_key(type, key_desc + 1, NULL); 2527c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2528453431a5SWaiman Long kfree_sensitive(new_key_string); 2529c538f6ecSOndrej Kozina return PTR_ERR(key); 2530c538f6ecSOndrej Kozina } 2531c538f6ecSOndrej Kozina 2532f5b0cba8SOndrej Kozina down_read(&key->sem); 2533c538f6ecSOndrej Kozina 253427f5411aSDmitry Baryshkov ret = set_key(cc, key); 253527f5411aSDmitry Baryshkov if (ret < 0) { 2536f5b0cba8SOndrej Kozina up_read(&key->sem); 2537c538f6ecSOndrej Kozina key_put(key); 2538453431a5SWaiman Long kfree_sensitive(new_key_string); 253927f5411aSDmitry Baryshkov return ret; 2540c538f6ecSOndrej Kozina } 2541c538f6ecSOndrej Kozina 2542f5b0cba8SOndrej Kozina up_read(&key->sem); 2543c538f6ecSOndrej Kozina key_put(key); 2544c538f6ecSOndrej Kozina 2545c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2546c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2547c538f6ecSOndrej Kozina 2548c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2549c538f6ecSOndrej Kozina 2550c538f6ecSOndrej Kozina if (!ret) { 2551c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2552453431a5SWaiman Long kfree_sensitive(cc->key_string); 2553c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2554c538f6ecSOndrej Kozina } else 2555453431a5SWaiman Long kfree_sensitive(new_key_string); 2556c538f6ecSOndrej Kozina 2557c538f6ecSOndrej Kozina return ret; 2558c538f6ecSOndrej Kozina } 2559c538f6ecSOndrej Kozina 2560c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2561c538f6ecSOndrej Kozina { 2562c538f6ecSOndrej Kozina char *colon, dummy; 2563c538f6ecSOndrej Kozina int ret; 2564c538f6ecSOndrej Kozina 2565c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2566c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2567c538f6ecSOndrej Kozina 2568c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2569c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2570c538f6ecSOndrej Kozina if (!colon) 2571c538f6ecSOndrej Kozina return -EINVAL; 2572c538f6ecSOndrej Kozina 2573c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2574c538f6ecSOndrej Kozina return -EINVAL; 2575c538f6ecSOndrej Kozina 2576c538f6ecSOndrej Kozina *key_string = colon; 2577c538f6ecSOndrej Kozina 2578c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2579c538f6ecSOndrej Kozina 2580c538f6ecSOndrej Kozina return ret; 2581c538f6ecSOndrej Kozina } 2582c538f6ecSOndrej Kozina 2583c538f6ecSOndrej Kozina #else 2584c538f6ecSOndrej Kozina 2585c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2586c538f6ecSOndrej Kozina { 2587c538f6ecSOndrej Kozina return -EINVAL; 2588c538f6ecSOndrej Kozina } 2589c538f6ecSOndrej Kozina 2590c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2591c538f6ecSOndrej Kozina { 2592c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2593c538f6ecSOndrej Kozina } 2594c538f6ecSOndrej Kozina 259527f5411aSDmitry Baryshkov #endif /* CONFIG_KEYS */ 2596c538f6ecSOndrej Kozina 2597e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2598e48d4bbfSMilan Broz { 2599de8be5acSMilan Broz int r = -EINVAL; 2600de8be5acSMilan Broz int key_string_len = strlen(key); 2601de8be5acSMilan Broz 260269a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 260369a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2604de8be5acSMilan Broz goto out; 2605e48d4bbfSMilan Broz 2606c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2607c538f6ecSOndrej Kozina if (key[0] == ':') { 2608c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2609c538f6ecSOndrej Kozina goto out; 2610c538f6ecSOndrej Kozina } 2611c538f6ecSOndrej Kozina 2612265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2613265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2614265e9098SOndrej Kozina 2615c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2616453431a5SWaiman Long kfree_sensitive(cc->key_string); 2617c538f6ecSOndrej Kozina cc->key_string = NULL; 2618c538f6ecSOndrej Kozina 2619e944e03eSAndy Shevchenko /* Decode key from its hex representation. */ 2620e944e03eSAndy Shevchenko if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2621de8be5acSMilan Broz goto out; 2622e48d4bbfSMilan Broz 2623671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2624265e9098SOndrej Kozina if (!r) 2625e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2626e48d4bbfSMilan Broz 2627de8be5acSMilan Broz out: 2628de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2629de8be5acSMilan Broz memset(key, '0', key_string_len); 2630de8be5acSMilan Broz 2631de8be5acSMilan Broz return r; 2632e48d4bbfSMilan Broz } 2633e48d4bbfSMilan Broz 2634e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2635e48d4bbfSMilan Broz { 2636c82feeecSOndrej Kozina int r; 2637c82feeecSOndrej Kozina 2638e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2639c82feeecSOndrej Kozina get_random_bytes(&cc->key, cc->key_size); 26404a52ffc7SMilan Broz 26414a52ffc7SMilan Broz /* Wipe IV private keys */ 26424a52ffc7SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 26434a52ffc7SMilan Broz r = cc->iv_gen_ops->wipe(cc); 26444a52ffc7SMilan Broz if (r) 26454a52ffc7SMilan Broz return r; 26464a52ffc7SMilan Broz } 26474a52ffc7SMilan Broz 2648453431a5SWaiman Long kfree_sensitive(cc->key_string); 2649c538f6ecSOndrej Kozina cc->key_string = NULL; 2650c82feeecSOndrej Kozina r = crypt_setkey(cc); 2651c82feeecSOndrej Kozina memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2652c0297721SAndi Kleen 2653c82feeecSOndrej Kozina return r; 2654e48d4bbfSMilan Broz } 2655e48d4bbfSMilan Broz 26565059353dSMikulas Patocka static void crypt_calculate_pages_per_client(void) 26575059353dSMikulas Patocka { 2658ca79b0c2SArun KS unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; 26595059353dSMikulas Patocka 26605059353dSMikulas Patocka if (!dm_crypt_clients_n) 26615059353dSMikulas Patocka return; 26625059353dSMikulas Patocka 26635059353dSMikulas Patocka pages /= dm_crypt_clients_n; 26645059353dSMikulas Patocka if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) 26655059353dSMikulas Patocka pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; 26665059353dSMikulas Patocka dm_crypt_pages_per_client = pages; 26675059353dSMikulas Patocka } 26685059353dSMikulas Patocka 26695059353dSMikulas Patocka static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) 26705059353dSMikulas Patocka { 26715059353dSMikulas Patocka struct crypt_config *cc = pool_data; 26725059353dSMikulas Patocka struct page *page; 26735059353dSMikulas Patocka 2674528b16bfSArne Welzel /* 2675528b16bfSArne Welzel * Note, percpu_counter_read_positive() may over (and under) estimate 2676528b16bfSArne Welzel * the current usage by at most (batch - 1) * num_online_cpus() pages, 2677528b16bfSArne Welzel * but avoids potential spinlock contention of an exact result. 2678528b16bfSArne Welzel */ 2679528b16bfSArne Welzel if (unlikely(percpu_counter_read_positive(&cc->n_allocated_pages) >= dm_crypt_pages_per_client) && 26805059353dSMikulas Patocka likely(gfp_mask & __GFP_NORETRY)) 26815059353dSMikulas Patocka return NULL; 26825059353dSMikulas Patocka 26835059353dSMikulas Patocka page = alloc_page(gfp_mask); 26845059353dSMikulas Patocka if (likely(page != NULL)) 26855059353dSMikulas Patocka percpu_counter_add(&cc->n_allocated_pages, 1); 26865059353dSMikulas Patocka 26875059353dSMikulas Patocka return page; 26885059353dSMikulas Patocka } 26895059353dSMikulas Patocka 26905059353dSMikulas Patocka static void crypt_page_free(void *page, void *pool_data) 26915059353dSMikulas Patocka { 26925059353dSMikulas Patocka struct crypt_config *cc = pool_data; 26935059353dSMikulas Patocka 26945059353dSMikulas Patocka __free_page(page); 26955059353dSMikulas Patocka percpu_counter_sub(&cc->n_allocated_pages, 1); 26965059353dSMikulas Patocka } 26975059353dSMikulas Patocka 269828513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 269928513fccSMilan Broz { 270028513fccSMilan Broz struct crypt_config *cc = ti->private; 270128513fccSMilan Broz 270228513fccSMilan Broz ti->private = NULL; 270328513fccSMilan Broz 270428513fccSMilan Broz if (!cc) 270528513fccSMilan Broz return; 270628513fccSMilan Broz 2707f659b100SRabin Vincent if (cc->write_thread) 2708dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2709dc267621SMikulas Patocka 271028513fccSMilan Broz if (cc->io_queue) 271128513fccSMilan Broz destroy_workqueue(cc->io_queue); 271228513fccSMilan Broz if (cc->crypt_queue) 271328513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 271428513fccSMilan Broz 2715fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2716fd2d231fSMikulas Patocka 27176f1c819cSKent Overstreet bioset_exit(&cc->bs); 271828513fccSMilan Broz 27196f1c819cSKent Overstreet mempool_exit(&cc->page_pool); 27206f1c819cSKent Overstreet mempool_exit(&cc->req_pool); 27216f1c819cSKent Overstreet mempool_exit(&cc->tag_pool); 27226f1c819cSKent Overstreet 2723d00a11dfSKent Overstreet WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); 2724d00a11dfSKent Overstreet percpu_counter_destroy(&cc->n_allocated_pages); 2725d00a11dfSKent Overstreet 272628513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 272728513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 272828513fccSMilan Broz 272928513fccSMilan Broz if (cc->dev) 273028513fccSMilan Broz dm_put_device(ti, cc->dev); 273128513fccSMilan Broz 2732453431a5SWaiman Long kfree_sensitive(cc->cipher_string); 2733453431a5SWaiman Long kfree_sensitive(cc->key_string); 2734453431a5SWaiman Long kfree_sensitive(cc->cipher_auth); 2735453431a5SWaiman Long kfree_sensitive(cc->authenc_key); 273628513fccSMilan Broz 2737d5ffebddSMike Snitzer mutex_destroy(&cc->bio_alloc_lock); 2738d5ffebddSMike Snitzer 273928513fccSMilan Broz /* Must zero key material before freeing */ 2740453431a5SWaiman Long kfree_sensitive(cc); 27415059353dSMikulas Patocka 27425059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 27435059353dSMikulas Patocka WARN_ON(!dm_crypt_clients_n); 27445059353dSMikulas Patocka dm_crypt_clients_n--; 27455059353dSMikulas Patocka crypt_calculate_pages_per_client(); 27465059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 274758d0f180SMichael Weiß 274858d0f180SMichael Weiß dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); 274928513fccSMilan Broz } 275028513fccSMilan Broz 2751e889f97aSMilan Broz static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 27521da177e4SLinus Torvalds { 27535ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 27541da177e4SLinus Torvalds 275533d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2756e889f97aSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2757e889f97aSMilan Broz else 2758bbdb23b5SHerbert Xu cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2759e889f97aSMilan Broz 27605ebaee6dSMilan Broz if (cc->iv_size) 27615ebaee6dSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 27625ebaee6dSMilan Broz cc->iv_size = max(cc->iv_size, 27635ebaee6dSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 27645ebaee6dSMilan Broz else if (ivmode) { 27655ebaee6dSMilan Broz DMWARN("Selected cipher does not support IVs"); 27665ebaee6dSMilan Broz ivmode = NULL; 27675ebaee6dSMilan Broz } 27685ebaee6dSMilan Broz 27695ebaee6dSMilan Broz /* Choose ivmode, see comments at iv code. */ 27701da177e4SLinus Torvalds if (ivmode == NULL) 27711da177e4SLinus Torvalds cc->iv_gen_ops = NULL; 27721da177e4SLinus Torvalds else if (strcmp(ivmode, "plain") == 0) 27731da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_plain_ops; 277461afef61SMilan Broz else if (strcmp(ivmode, "plain64") == 0) 277561afef61SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 27767e3fd855SMilan Broz else if (strcmp(ivmode, "plain64be") == 0) 27777e3fd855SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64be_ops; 27781da177e4SLinus Torvalds else if (strcmp(ivmode, "essiv") == 0) 27791da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_essiv_ops; 278048527fa7SRik Snel else if (strcmp(ivmode, "benbi") == 0) 278148527fa7SRik Snel cc->iv_gen_ops = &crypt_iv_benbi_ops; 278246b47730SLudwig Nussel else if (strcmp(ivmode, "null") == 0) 278346b47730SLudwig Nussel cc->iv_gen_ops = &crypt_iv_null_ops; 2784b9411d73SMilan Broz else if (strcmp(ivmode, "eboiv") == 0) 2785b9411d73SMilan Broz cc->iv_gen_ops = &crypt_iv_eboiv_ops; 2786bbb16584SMilan Broz else if (strcmp(ivmode, "elephant") == 0) { 2787bbb16584SMilan Broz cc->iv_gen_ops = &crypt_iv_elephant_ops; 2788bbb16584SMilan Broz cc->key_parts = 2; 2789bbb16584SMilan Broz cc->key_extra_size = cc->key_size / 2; 2790bbb16584SMilan Broz if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) 2791bbb16584SMilan Broz return -EINVAL; 2792bbb16584SMilan Broz set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); 2793bbb16584SMilan Broz } else if (strcmp(ivmode, "lmk") == 0) { 279434745785SMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2795ed04d981SMilan Broz /* 2796ed04d981SMilan Broz * Version 2 and 3 is recognised according 279734745785SMilan Broz * to length of provided multi-key string. 279834745785SMilan Broz * If present (version 3), last key is used as IV seed. 2799ed04d981SMilan Broz * All keys (including IV seed) are always the same size. 280034745785SMilan Broz */ 2801da31a078SMilan Broz if (cc->key_size % cc->key_parts) { 280234745785SMilan Broz cc->key_parts++; 2803da31a078SMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2804da31a078SMilan Broz } 2805ed04d981SMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2806ed04d981SMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2807ed04d981SMilan Broz cc->key_parts += 2; /* IV + whitening */ 2808ed04d981SMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2809e889f97aSMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2810e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2811e889f97aSMilan Broz /* Need storage space in integrity fields. */ 2812e889f97aSMilan Broz cc->integrity_iv_size = cc->iv_size; 281334745785SMilan Broz } else { 281472d94861SAlasdair G Kergon ti->error = "Invalid IV mode"; 2815e889f97aSMilan Broz return -EINVAL; 28161da177e4SLinus Torvalds } 28171da177e4SLinus Torvalds 2818e889f97aSMilan Broz return 0; 2819e889f97aSMilan Broz } 2820e889f97aSMilan Broz 282133d2f09fSMilan Broz /* 282233d2f09fSMilan Broz * Workaround to parse HMAC algorithm from AEAD crypto API spec. 282333d2f09fSMilan Broz * The HMAC is needed to calculate tag size (HMAC digest size). 282433d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 282533d2f09fSMilan Broz */ 282633d2f09fSMilan Broz static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 282733d2f09fSMilan Broz { 282833d2f09fSMilan Broz char *start, *end, *mac_alg = NULL; 282933d2f09fSMilan Broz struct crypto_ahash *mac; 283033d2f09fSMilan Broz 283133d2f09fSMilan Broz if (!strstarts(cipher_api, "authenc(")) 283233d2f09fSMilan Broz return 0; 283333d2f09fSMilan Broz 283433d2f09fSMilan Broz start = strchr(cipher_api, '('); 283533d2f09fSMilan Broz end = strchr(cipher_api, ','); 283633d2f09fSMilan Broz if (!start || !end || ++start > end) 283733d2f09fSMilan Broz return -EINVAL; 283833d2f09fSMilan Broz 283933d2f09fSMilan Broz mac_alg = kzalloc(end - start + 1, GFP_KERNEL); 284033d2f09fSMilan Broz if (!mac_alg) 284133d2f09fSMilan Broz return -ENOMEM; 284233d2f09fSMilan Broz strncpy(mac_alg, start, end - start); 284333d2f09fSMilan Broz 2844cd746938SMikulas Patocka mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY); 284533d2f09fSMilan Broz kfree(mac_alg); 284633d2f09fSMilan Broz 284733d2f09fSMilan Broz if (IS_ERR(mac)) 284833d2f09fSMilan Broz return PTR_ERR(mac); 284933d2f09fSMilan Broz 285033d2f09fSMilan Broz cc->key_mac_size = crypto_ahash_digestsize(mac); 285133d2f09fSMilan Broz crypto_free_ahash(mac); 285233d2f09fSMilan Broz 285333d2f09fSMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 285433d2f09fSMilan Broz if (!cc->authenc_key) 285533d2f09fSMilan Broz return -ENOMEM; 285633d2f09fSMilan Broz 285733d2f09fSMilan Broz return 0; 285833d2f09fSMilan Broz } 285933d2f09fSMilan Broz 286033d2f09fSMilan Broz static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 286133d2f09fSMilan Broz char **ivmode, char **ivopts) 28621da177e4SLinus Torvalds { 28635ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2864a1a262b6SArd Biesheuvel char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; 286533d2f09fSMilan Broz int ret = -EINVAL; 286633d2f09fSMilan Broz 286733d2f09fSMilan Broz cc->tfms_count = 1; 286833d2f09fSMilan Broz 286933d2f09fSMilan Broz /* 287033d2f09fSMilan Broz * New format (capi: prefix) 287133d2f09fSMilan Broz * capi:cipher_api_spec-iv:ivopts 287233d2f09fSMilan Broz */ 287333d2f09fSMilan Broz tmp = &cipher_in[strlen("capi:")]; 28741856b9f7SMilan Broz 28751856b9f7SMilan Broz /* Separate IV options if present, it can contain another '-' in hash name */ 28761856b9f7SMilan Broz *ivopts = strrchr(tmp, ':'); 28771856b9f7SMilan Broz if (*ivopts) { 28781856b9f7SMilan Broz **ivopts = '\0'; 28791856b9f7SMilan Broz (*ivopts)++; 28801856b9f7SMilan Broz } 28811856b9f7SMilan Broz /* Parse IV mode */ 28821856b9f7SMilan Broz *ivmode = strrchr(tmp, '-'); 28831856b9f7SMilan Broz if (*ivmode) { 28841856b9f7SMilan Broz **ivmode = '\0'; 28851856b9f7SMilan Broz (*ivmode)++; 28861856b9f7SMilan Broz } 28871856b9f7SMilan Broz /* The rest is crypto API spec */ 28881856b9f7SMilan Broz cipher_api = tmp; 288933d2f09fSMilan Broz 2890a1a262b6SArd Biesheuvel /* Alloc AEAD, can be used only in new format. */ 2891a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) { 2892a1a262b6SArd Biesheuvel ret = crypt_ctr_auth_cipher(cc, cipher_api); 2893a1a262b6SArd Biesheuvel if (ret < 0) { 2894a1a262b6SArd Biesheuvel ti->error = "Invalid AEAD cipher spec"; 2895a1a262b6SArd Biesheuvel return -ENOMEM; 2896a1a262b6SArd Biesheuvel } 2897a1a262b6SArd Biesheuvel } 2898a1a262b6SArd Biesheuvel 289933d2f09fSMilan Broz if (*ivmode && !strcmp(*ivmode, "lmk")) 290033d2f09fSMilan Broz cc->tfms_count = 64; 290133d2f09fSMilan Broz 2902a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2903a1a262b6SArd Biesheuvel if (!*ivopts) { 2904a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2905a1a262b6SArd Biesheuvel return -EINVAL; 2906a1a262b6SArd Biesheuvel } 2907a1a262b6SArd Biesheuvel ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", 2908a1a262b6SArd Biesheuvel cipher_api, *ivopts); 2909a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 2910a1a262b6SArd Biesheuvel ti->error = "Cannot allocate cipher string"; 2911a1a262b6SArd Biesheuvel return -ENOMEM; 2912a1a262b6SArd Biesheuvel } 2913a1a262b6SArd Biesheuvel cipher_api = buf; 2914a1a262b6SArd Biesheuvel } 2915a1a262b6SArd Biesheuvel 291633d2f09fSMilan Broz cc->key_parts = cc->tfms_count; 291733d2f09fSMilan Broz 291833d2f09fSMilan Broz /* Allocate cipher */ 291933d2f09fSMilan Broz ret = crypt_alloc_tfms(cc, cipher_api); 292033d2f09fSMilan Broz if (ret < 0) { 292133d2f09fSMilan Broz ti->error = "Error allocating crypto tfm"; 292233d2f09fSMilan Broz return ret; 292333d2f09fSMilan Broz } 292433d2f09fSMilan Broz 2925a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) 292633d2f09fSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2927a1a262b6SArd Biesheuvel else 292833d2f09fSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 292933d2f09fSMilan Broz 293033d2f09fSMilan Broz return 0; 293133d2f09fSMilan Broz } 293233d2f09fSMilan Broz 293333d2f09fSMilan Broz static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 293433d2f09fSMilan Broz char **ivmode, char **ivopts) 293533d2f09fSMilan Broz { 293633d2f09fSMilan Broz struct crypt_config *cc = ti->private; 293733d2f09fSMilan Broz char *tmp, *cipher, *chainmode, *keycount; 29385ebaee6dSMilan Broz char *cipher_api = NULL; 29395ebaee6dSMilan Broz int ret = -EINVAL; 29405ebaee6dSMilan Broz char dummy; 29415ebaee6dSMilan Broz 294233d2f09fSMilan Broz if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 29435ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 29445ebaee6dSMilan Broz return -EINVAL; 29455ebaee6dSMilan Broz } 29465ebaee6dSMilan Broz 29471da177e4SLinus Torvalds /* 29485ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 29495ebaee6dSMilan Broz * cipher[:keycount]-mode-iv:ivopts 29505ebaee6dSMilan Broz */ 29515ebaee6dSMilan Broz tmp = cipher_in; 29525ebaee6dSMilan Broz keycount = strsep(&tmp, "-"); 29535ebaee6dSMilan Broz cipher = strsep(&keycount, ":"); 29545ebaee6dSMilan Broz 295569a8cfcdSMilan Broz if (!keycount) 29565ebaee6dSMilan Broz cc->tfms_count = 1; 29575ebaee6dSMilan Broz else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 29585ebaee6dSMilan Broz !is_power_of_2(cc->tfms_count)) { 29595ebaee6dSMilan Broz ti->error = "Bad cipher key count specification"; 29605ebaee6dSMilan Broz return -EINVAL; 29615ebaee6dSMilan Broz } 296228513fccSMilan Broz cc->key_parts = cc->tfms_count; 29631da177e4SLinus Torvalds 2964ddd42edfSMilan Broz chainmode = strsep(&tmp, "-"); 29651856b9f7SMilan Broz *ivmode = strsep(&tmp, ":"); 29661856b9f7SMilan Broz *ivopts = tmp; 2967ddd42edfSMilan Broz 2968ddd42edfSMilan Broz /* 2969ddd42edfSMilan Broz * For compatibility with the original dm-crypt mapping format, if 2970ddd42edfSMilan Broz * only the cipher name is supplied, use cbc-plain. 297128513fccSMilan Broz */ 297233d2f09fSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 2973cabf08e4SMilan Broz chainmode = "cbc"; 297433d2f09fSMilan Broz *ivmode = "plain"; 2975cabf08e4SMilan Broz } 2976cabf08e4SMilan Broz 297733d2f09fSMilan Broz if (strcmp(chainmode, "ecb") && !*ivmode) { 2978c0297721SAndi Kleen ti->error = "IV mechanism required"; 2979c0297721SAndi Kleen return -EINVAL; 2980c0297721SAndi Kleen } 2981c0297721SAndi Kleen 2982cabf08e4SMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 29839934a8beSMilan Broz if (!cipher_api) 298428513fccSMilan Broz goto bad_mem; 29859934a8beSMilan Broz 2986a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2987a1a262b6SArd Biesheuvel if (!*ivopts) { 2988a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2989a1a262b6SArd Biesheuvel kfree(cipher_api); 2990a1a262b6SArd Biesheuvel return -EINVAL; 2991a1a262b6SArd Biesheuvel } 2992a1a262b6SArd Biesheuvel ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2993a1a262b6SArd Biesheuvel "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); 2994a1a262b6SArd Biesheuvel } else { 29959934a8beSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2996647c7db1SMikulas Patocka "%s(%s)", chainmode, cipher); 2997a1a262b6SArd Biesheuvel } 2998a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 29991da177e4SLinus Torvalds kfree(cipher_api); 300028513fccSMilan Broz goto bad_mem; 300128513fccSMilan Broz } 300228513fccSMilan Broz 30031da177e4SLinus Torvalds /* Allocate cipher */ 30041da177e4SLinus Torvalds ret = crypt_alloc_tfms(cc, cipher_api); 30051da177e4SLinus Torvalds if (ret < 0) { 30061da177e4SLinus Torvalds ti->error = "Error allocating crypto tfm"; 300733d2f09fSMilan Broz kfree(cipher_api); 300833d2f09fSMilan Broz return ret; 3009028867acSAlasdair G Kergon } 3010bd86e320SJeffy Chen kfree(cipher_api); 3011647c7db1SMikulas Patocka 301233d2f09fSMilan Broz return 0; 301333d2f09fSMilan Broz bad_mem: 301433d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 301533d2f09fSMilan Broz return -ENOMEM; 301633d2f09fSMilan Broz } 301733d2f09fSMilan Broz 301833d2f09fSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 301933d2f09fSMilan Broz { 302033d2f09fSMilan Broz struct crypt_config *cc = ti->private; 302133d2f09fSMilan Broz char *ivmode = NULL, *ivopts = NULL; 302233d2f09fSMilan Broz int ret; 302333d2f09fSMilan Broz 302433d2f09fSMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 302533d2f09fSMilan Broz if (!cc->cipher_string) { 302633d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 302733d2f09fSMilan Broz return -ENOMEM; 302833d2f09fSMilan Broz } 302933d2f09fSMilan Broz 303033d2f09fSMilan Broz if (strstarts(cipher_in, "capi:")) 303133d2f09fSMilan Broz ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 303233d2f09fSMilan Broz else 303333d2f09fSMilan Broz ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 303433d2f09fSMilan Broz if (ret) 303533d2f09fSMilan Broz return ret; 303633d2f09fSMilan Broz 3037647c7db1SMikulas Patocka /* Initialize IV */ 3038e889f97aSMilan Broz ret = crypt_ctr_ivmode(ti, ivmode); 3039e889f97aSMilan Broz if (ret < 0) 304033d2f09fSMilan Broz return ret; 30411da177e4SLinus Torvalds 3042da31a078SMilan Broz /* Initialize and set key */ 3043da31a078SMilan Broz ret = crypt_set_key(cc, key); 3044da31a078SMilan Broz if (ret < 0) { 3045da31a078SMilan Broz ti->error = "Error decoding and setting key"; 304633d2f09fSMilan Broz return ret; 3047da31a078SMilan Broz } 3048da31a078SMilan Broz 30491da177e4SLinus Torvalds /* Allocate IV */ 30501da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 30511da177e4SLinus Torvalds ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 30521da177e4SLinus Torvalds if (ret < 0) { 30531da177e4SLinus Torvalds ti->error = "Error creating IV"; 305433d2f09fSMilan Broz return ret; 30551da177e4SLinus Torvalds } 30561da177e4SLinus Torvalds } 30571da177e4SLinus Torvalds 30581da177e4SLinus Torvalds /* Initialize IV (set keys for ESSIV etc) */ 30591da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 30601da177e4SLinus Torvalds ret = cc->iv_gen_ops->init(cc); 30611da177e4SLinus Torvalds if (ret < 0) { 30621da177e4SLinus Torvalds ti->error = "Error initialising IV"; 30631da177e4SLinus Torvalds return ret; 30641da177e4SLinus Torvalds } 30651da177e4SLinus Torvalds } 30661da177e4SLinus Torvalds 3067dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 3068dc94902bSOndrej Kozina if (cc->key_string) 3069dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 3070dc94902bSOndrej Kozina 307133d2f09fSMilan Broz return ret; 30721da177e4SLinus Torvalds } 30731da177e4SLinus Torvalds 3074ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 3075ef43aa38SMilan Broz { 3076ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 3077ef43aa38SMilan Broz struct dm_arg_set as; 30785916a22bSEric Biggers static const struct dm_arg _args[] = { 307939d42fa9SIgnat Korchagin {0, 8, "Invalid number of feature args"}, 3080ef43aa38SMilan Broz }; 3081ef43aa38SMilan Broz unsigned int opt_params, val; 3082ef43aa38SMilan Broz const char *opt_string, *sval; 30838f0009a2SMilan Broz char dummy; 3084ef43aa38SMilan Broz int ret; 3085ef43aa38SMilan Broz 3086ef43aa38SMilan Broz /* Optional parameters */ 3087ef43aa38SMilan Broz as.argc = argc; 3088ef43aa38SMilan Broz as.argv = argv; 3089ef43aa38SMilan Broz 3090ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 3091ef43aa38SMilan Broz if (ret) 30921da177e4SLinus Torvalds return ret; 30931da177e4SLinus Torvalds 3094ef43aa38SMilan Broz while (opt_params--) { 3095ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 3096ef43aa38SMilan Broz if (!opt_string) { 3097ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 3098ef43aa38SMilan Broz return -EINVAL; 3099ef43aa38SMilan Broz } 3100ef43aa38SMilan Broz 3101ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 3102ef43aa38SMilan Broz ti->num_discard_bios = 1; 3103ef43aa38SMilan Broz 3104ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 3105ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 3106ef43aa38SMilan Broz 3107ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 3108ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 310939d42fa9SIgnat Korchagin else if (!strcasecmp(opt_string, "no_read_workqueue")) 311039d42fa9SIgnat Korchagin set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 311139d42fa9SIgnat Korchagin else if (!strcasecmp(opt_string, "no_write_workqueue")) 311239d42fa9SIgnat Korchagin set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3113ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 3114ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 3115ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 3116ef43aa38SMilan Broz return -EINVAL; 3117ef43aa38SMilan Broz } 3118ef43aa38SMilan Broz cc->on_disk_tag_size = val; 3119ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 3120ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 3121ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 3122ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 3123ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 3124ef43aa38SMilan Broz return -EINVAL; 3125ef43aa38SMilan Broz } 3126ef43aa38SMilan Broz 3127ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 3128ef43aa38SMilan Broz if (!cc->cipher_auth) 31291da177e4SLinus Torvalds return -ENOMEM; 3130ff3af92bSMikulas Patocka } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { 31318f0009a2SMilan Broz if (cc->sector_size < (1 << SECTOR_SHIFT) || 31328f0009a2SMilan Broz cc->sector_size > 4096 || 3133ff3af92bSMikulas Patocka (cc->sector_size & (cc->sector_size - 1))) { 31348f0009a2SMilan Broz ti->error = "Invalid feature value for sector_size"; 31358f0009a2SMilan Broz return -EINVAL; 31368f0009a2SMilan Broz } 3137783874b0SMilan Broz if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { 3138783874b0SMilan Broz ti->error = "Device size is not multiple of sector_size feature"; 3139783874b0SMilan Broz return -EINVAL; 3140783874b0SMilan Broz } 3141ff3af92bSMikulas Patocka cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 31428f0009a2SMilan Broz } else if (!strcasecmp(opt_string, "iv_large_sectors")) 31438f0009a2SMilan Broz set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 31448f0009a2SMilan Broz else { 3145ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 3146ef43aa38SMilan Broz return -EINVAL; 3147ef43aa38SMilan Broz } 3148ef43aa38SMilan Broz } 3149ef43aa38SMilan Broz 3150ef43aa38SMilan Broz return 0; 31511da177e4SLinus Torvalds } 31521da177e4SLinus Torvalds 31538e225f04SDamien Le Moal #ifdef CONFIG_BLK_DEV_ZONED 31548e225f04SDamien Le Moal static int crypt_report_zones(struct dm_target *ti, 31558e225f04SDamien Le Moal struct dm_report_zones_args *args, unsigned int nr_zones) 31568e225f04SDamien Le Moal { 31578e225f04SDamien Le Moal struct crypt_config *cc = ti->private; 31588e225f04SDamien Le Moal 3159912e8875SDamien Le Moal return dm_report_zones(cc->dev->bdev, cc->start, 3160912e8875SDamien Le Moal cc->start + dm_target_offset(ti, args->next_sector), 3161912e8875SDamien Le Moal args, nr_zones); 31628e225f04SDamien Le Moal } 3163e3290b94SMike Snitzer #else 3164e3290b94SMike Snitzer #define crypt_report_zones NULL 31658e225f04SDamien Le Moal #endif 31668e225f04SDamien Le Moal 31671da177e4SLinus Torvalds /* 31681da177e4SLinus Torvalds * Construct an encryption mapping: 3169c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 31701da177e4SLinus Torvalds */ 31711da177e4SLinus Torvalds static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 31721da177e4SLinus Torvalds { 31731da177e4SLinus Torvalds struct crypt_config *cc; 3174ed0302e8SMichał Mirosław const char *devname = dm_table_device_name(ti->table); 3175c538f6ecSOndrej Kozina int key_size; 3176ef43aa38SMilan Broz unsigned int align_mask; 31771da177e4SLinus Torvalds unsigned long long tmpll; 31781da177e4SLinus Torvalds int ret; 3179ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 318031998ef1SMikulas Patocka char dummy; 31811da177e4SLinus Torvalds 3182772ae5f5SMilan Broz if (argc < 5) { 31831da177e4SLinus Torvalds ti->error = "Not enough arguments"; 31841da177e4SLinus Torvalds return -EINVAL; 31851da177e4SLinus Torvalds } 31861da177e4SLinus Torvalds 3187c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 3188c538f6ecSOndrej Kozina if (key_size < 0) { 3189c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 3190c538f6ecSOndrej Kozina return -EINVAL; 3191c538f6ecSOndrej Kozina } 31921da177e4SLinus Torvalds 31939c81c99bSZhengyuan Liu cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL); 31941da177e4SLinus Torvalds if (!cc) { 31951da177e4SLinus Torvalds ti->error = "Cannot allocate encryption context"; 31961da177e4SLinus Torvalds return -ENOMEM; 31971da177e4SLinus Torvalds } 31981da177e4SLinus Torvalds cc->key_size = key_size; 31998f0009a2SMilan Broz cc->sector_size = (1 << SECTOR_SHIFT); 3200ff3af92bSMikulas Patocka cc->sector_shift = 0; 32011da177e4SLinus Torvalds 32021da177e4SLinus Torvalds ti->private = cc; 3203ef43aa38SMilan Broz 32045059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 32055059353dSMikulas Patocka dm_crypt_clients_n++; 32065059353dSMikulas Patocka crypt_calculate_pages_per_client(); 32075059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 32085059353dSMikulas Patocka 32095059353dSMikulas Patocka ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); 32105059353dSMikulas Patocka if (ret < 0) 32115059353dSMikulas Patocka goto bad; 32125059353dSMikulas Patocka 3213ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 3214ef43aa38SMilan Broz if (argc > 5) { 3215ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 3216ef43aa38SMilan Broz if (ret) 3217ef43aa38SMilan Broz goto bad; 3218ef43aa38SMilan Broz } 3219ef43aa38SMilan Broz 32201da177e4SLinus Torvalds ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 32211da177e4SLinus Torvalds if (ret < 0) 32221da177e4SLinus Torvalds goto bad; 32231da177e4SLinus Torvalds 322433d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 3225ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 3226ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 3227ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 3228ef43aa38SMilan Broz } else { 3229bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 3230bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 3231ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 3232ef43aa38SMilan Broz } 3233d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 3234d49ec52fSMikulas Patocka 3235ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 3236d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 3237d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 3238ef43aa38SMilan Broz & align_mask; 3239d49ec52fSMikulas Patocka } else { 3240d49ec52fSMikulas Patocka /* 3241d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 3242d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 3243d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 3244d49ec52fSMikulas Patocka */ 3245ef43aa38SMilan Broz iv_size_padding = align_mask; 3246d49ec52fSMikulas Patocka } 32471da177e4SLinus Torvalds 3248ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 3249ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 3250ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 3251ef43aa38SMilan Broz cc->iv_size + 3252ef43aa38SMilan Broz sizeof(uint64_t) + 3253ef43aa38SMilan Broz sizeof(unsigned int); 3254ef43aa38SMilan Broz 32556f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); 32566f1c819cSKent Overstreet if (ret) { 32571da177e4SLinus Torvalds ti->error = "Cannot allocate crypt request mempool"; 32581da177e4SLinus Torvalds goto bad; 32591da177e4SLinus Torvalds } 32601da177e4SLinus Torvalds 326130187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 3262ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 3263d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 3264298a9fa0SMikulas Patocka 3265a8affc03SChristoph Hellwig ret = mempool_init(&cc->page_pool, BIO_MAX_VECS, crypt_page_alloc, crypt_page_free, cc); 32666f1c819cSKent Overstreet if (ret) { 32678b004457SMilan Broz ti->error = "Cannot allocate page mempool"; 3268e48d4bbfSMilan Broz goto bad; 32691da177e4SLinus Torvalds } 3270e48d4bbfSMilan Broz 32716f1c819cSKent Overstreet ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); 32726f1c819cSKent Overstreet if (ret) { 32730c395b0fSMilan Broz ti->error = "Cannot allocate crypt bioset"; 3274cabf08e4SMilan Broz goto bad; 327593e605c2SMilan Broz } 3276cabf08e4SMilan Broz 32777145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 32787145c241SMikulas Patocka 3279cabf08e4SMilan Broz ret = -EINVAL; 32808f0009a2SMilan Broz if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 32818f0009a2SMilan Broz (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 3282cabf08e4SMilan Broz ti->error = "Invalid iv_offset sector"; 3283cabf08e4SMilan Broz goto bad; 32841da177e4SLinus Torvalds } 3285d2a7ad29SKiyoshi Ueda cc->iv_offset = tmpll; 32861da177e4SLinus Torvalds 3287e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 3288e80d1c80SVivek Goyal if (ret) { 32891da177e4SLinus Torvalds ti->error = "Device lookup failed"; 32901da177e4SLinus Torvalds goto bad; 32911da177e4SLinus Torvalds } 32921da177e4SLinus Torvalds 3293e80d1c80SVivek Goyal ret = -EINVAL; 3294ef87bfc2SMilan Broz if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { 32951da177e4SLinus Torvalds ti->error = "Invalid device sector"; 32961da177e4SLinus Torvalds goto bad; 32971da177e4SLinus Torvalds } 32981da177e4SLinus Torvalds cc->start = tmpll; 32991da177e4SLinus Torvalds 3300f34ee1dcSDamien Le Moal if (bdev_is_zoned(cc->dev->bdev)) { 33018e225f04SDamien Le Moal /* 33028e225f04SDamien Le Moal * For zoned block devices, we need to preserve the issuer write 33038e225f04SDamien Le Moal * ordering. To do so, disable write workqueues and force inline 33048e225f04SDamien Le Moal * encryption completion. 33058e225f04SDamien Le Moal */ 33068e225f04SDamien Le Moal set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 33078e225f04SDamien Le Moal set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); 3308f34ee1dcSDamien Le Moal 3309f34ee1dcSDamien Le Moal /* 3310f34ee1dcSDamien Le Moal * All zone append writes to a zone of a zoned block device will 3311f34ee1dcSDamien Le Moal * have the same BIO sector, the start of the zone. When the 3312f34ee1dcSDamien Le Moal * cypher IV mode uses sector values, all data targeting a 3313f34ee1dcSDamien Le Moal * zone will be encrypted using the first sector numbers of the 3314f34ee1dcSDamien Le Moal * zone. This will not result in write errors but will 3315f34ee1dcSDamien Le Moal * cause most reads to fail as reads will use the sector values 3316f34ee1dcSDamien Le Moal * for the actual data locations, resulting in IV mismatch. 3317f34ee1dcSDamien Le Moal * To avoid this problem, ask DM core to emulate zone append 3318f34ee1dcSDamien Le Moal * operations with regular writes. 3319f34ee1dcSDamien Le Moal */ 3320f34ee1dcSDamien Le Moal DMDEBUG("Zone append operations will be emulated"); 3321f34ee1dcSDamien Le Moal ti->emulate_zone_append = true; 33228e225f04SDamien Le Moal } 33238e225f04SDamien Le Moal 332433d2f09fSMilan Broz if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 3325ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 3326772ae5f5SMilan Broz if (ret) 3327772ae5f5SMilan Broz goto bad; 3328772ae5f5SMilan Broz 3329ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 3330ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 3331ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 3332ef43aa38SMilan Broz 33336f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, 3334ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 33356f1c819cSKent Overstreet if (ret) { 3336ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 3337f3396c58SMikulas Patocka goto bad; 3338f3396c58SMikulas Patocka } 3339772ae5f5SMilan Broz 3340583fe747SMikulas Patocka cc->tag_pool_max_sectors <<= cc->sector_shift; 3341f3396c58SMikulas Patocka } 3342772ae5f5SMilan Broz 33431da177e4SLinus Torvalds ret = -ENOMEM; 3344f612b213SMike Snitzer cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname); 33451da177e4SLinus Torvalds if (!cc->io_queue) { 33461da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd io queue"; 33471da177e4SLinus Torvalds goto bad; 33481da177e4SLinus Torvalds } 334937af6560SChristophe Saout 3350f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 335148b0777cSMike Snitzer cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 3352ed0302e8SMichał Mirosław 1, devname); 3353f3396c58SMikulas Patocka else 335448b0777cSMike Snitzer cc->crypt_queue = alloc_workqueue("kcryptd/%s", 335548b0777cSMike Snitzer WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 3356ed0302e8SMichał Mirosław num_online_cpus(), devname); 33571da177e4SLinus Torvalds if (!cc->crypt_queue) { 33581da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd queue"; 33591da177e4SLinus Torvalds goto bad; 33601da177e4SLinus Torvalds } 33611da177e4SLinus Torvalds 3362c7329effSMikulas Patocka spin_lock_init(&cc->write_thread_lock); 3363b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 3364dc267621SMikulas Patocka 3365*a5217c11SCai Huoqing cc->write_thread = kthread_run(dmcrypt_write, cc, "dmcrypt_write/%s", devname); 3366dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 3367dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 3368dc267621SMikulas Patocka cc->write_thread = NULL; 3369dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 3370dc267621SMikulas Patocka goto bad; 3371dc267621SMikulas Patocka } 3372dc267621SMikulas Patocka 337355a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 3374a666e5c0SMikulas Patocka ti->limit_swap_bios = true; 3375983c7db3SMilan Broz 337658d0f180SMichael Weiß dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); 33771da177e4SLinus Torvalds return 0; 33781da177e4SLinus Torvalds 33791da177e4SLinus Torvalds bad: 338058d0f180SMichael Weiß dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); 33811da177e4SLinus Torvalds crypt_dtr(ti); 33821da177e4SLinus Torvalds return ret; 3383647c7db1SMikulas Patocka } 3384647c7db1SMikulas Patocka 33857de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 33861da177e4SLinus Torvalds { 33871da177e4SLinus Torvalds struct dm_crypt_io *io; 338849a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 3389647c7db1SMikulas Patocka 3390772ae5f5SMilan Broz /* 339128a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 339228a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 3393e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 3394772ae5f5SMilan Broz */ 33951eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 339628a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 339774d46992SChristoph Hellwig bio_set_dev(bio, cc->dev->bdev); 3398772ae5f5SMilan Broz if (bio_sectors(bio)) 33994f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 34004f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 3401647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 3402647c7db1SMikulas Patocka } 34031da177e4SLinus Torvalds 34044e870e94SMikulas Patocka /* 34054e870e94SMikulas Patocka * Check if bio is too large, split as needed. 34064e870e94SMikulas Patocka */ 3407a8affc03SChristoph Hellwig if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_VECS << PAGE_SHIFT)) && 3408ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 3409a8affc03SChristoph Hellwig dm_accept_partial_bio(bio, ((BIO_MAX_VECS << PAGE_SHIFT) >> SECTOR_SHIFT)); 34104e870e94SMikulas Patocka 34118f0009a2SMilan Broz /* 34128f0009a2SMilan Broz * Ensure that bio is a multiple of internal sector encryption size 34138f0009a2SMilan Broz * and is aligned to this size as defined in IO hints. 34148f0009a2SMilan Broz */ 34158f0009a2SMilan Broz if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 3416846785e6SChristoph Hellwig return DM_MAPIO_KILL; 34178f0009a2SMilan Broz 34188f0009a2SMilan Broz if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 3419846785e6SChristoph Hellwig return DM_MAPIO_KILL; 34208f0009a2SMilan Broz 3421298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 3422298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 3423ef43aa38SMilan Broz 3424ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 3425583fe747SMikulas Patocka unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); 3426ef43aa38SMilan Broz 3427ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 3428583fe747SMikulas Patocka unlikely(!(io->integrity_metadata = kmalloc(tag_len, 3429ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 3430ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 3431ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 34326f1c819cSKent Overstreet io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); 3433ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 3434ef43aa38SMilan Broz } 3435ef43aa38SMilan Broz } 3436ef43aa38SMilan Broz 343733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 3438ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 3439ef43aa38SMilan Broz else 3440ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 34411da177e4SLinus Torvalds 344220c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 344320c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 3444dc267621SMikulas Patocka kcryptd_queue_read(io); 344520c82538SMilan Broz } else 34464ee218cdSAndrew Morton kcryptd_queue_crypt(io); 34474ee218cdSAndrew Morton 34481da177e4SLinus Torvalds return DM_MAPIO_SUBMITTED; 34491da177e4SLinus Torvalds } 34501da177e4SLinus Torvalds 3451fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 34521f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 34531da177e4SLinus Torvalds { 34545ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 3455fd7c092eSMikulas Patocka unsigned i, sz = 0; 3456f3396c58SMikulas Patocka int num_feature_args = 0; 34571da177e4SLinus Torvalds 34581da177e4SLinus Torvalds switch (type) { 34591da177e4SLinus Torvalds case STATUSTYPE_INFO: 34601da177e4SLinus Torvalds result[0] = '\0'; 34611da177e4SLinus Torvalds break; 34621da177e4SLinus Torvalds 34631da177e4SLinus Torvalds case STATUSTYPE_TABLE: 34647dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 34651da177e4SLinus Torvalds 3466c538f6ecSOndrej Kozina if (cc->key_size > 0) { 3467c538f6ecSOndrej Kozina if (cc->key_string) 3468c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 3469c538f6ecSOndrej Kozina else 3470fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 3471fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 3472c538f6ecSOndrej Kozina } else 3473fd7c092eSMikulas Patocka DMEMIT("-"); 34741da177e4SLinus Torvalds 34751da177e4SLinus Torvalds DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 34761da177e4SLinus Torvalds cc->dev->name, (unsigned long long)cc->start); 3477772ae5f5SMilan Broz 3478f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 3479f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 34800f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 348139d42fa9SIgnat Korchagin num_feature_args += test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags); 348239d42fa9SIgnat Korchagin num_feature_args += test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); 3483ff3af92bSMikulas Patocka num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 34848f0009a2SMilan Broz num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3485ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3486ef43aa38SMilan Broz num_feature_args++; 3487f3396c58SMikulas Patocka if (num_feature_args) { 3488f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 348955a62eefSAlasdair G Kergon if (ti->num_discard_bios) 3490f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 3491f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3492f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 34930f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 34940f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 349539d42fa9SIgnat Korchagin if (test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags)) 349639d42fa9SIgnat Korchagin DMEMIT(" no_read_workqueue"); 349739d42fa9SIgnat Korchagin if (test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags)) 349839d42fa9SIgnat Korchagin DMEMIT(" no_write_workqueue"); 3499ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3500ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 35018f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) 35028f0009a2SMilan Broz DMEMIT(" sector_size:%d", cc->sector_size); 35038f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 35048f0009a2SMilan Broz DMEMIT(" iv_large_sectors"); 3505f3396c58SMikulas Patocka } 35068ec45662STushar Sugandhi break; 3507772ae5f5SMilan Broz 35088ec45662STushar Sugandhi case STATUSTYPE_IMA: 35098ec45662STushar Sugandhi DMEMIT_TARGET_NAME_VERSION(ti->type); 35108ec45662STushar Sugandhi DMEMIT(",allow_discards=%c", ti->num_discard_bios ? 'y' : 'n'); 35118ec45662STushar Sugandhi DMEMIT(",same_cpu_crypt=%c", test_bit(DM_CRYPT_SAME_CPU, &cc->flags) ? 'y' : 'n'); 35128ec45662STushar Sugandhi DMEMIT(",submit_from_crypt_cpus=%c", test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags) ? 35138ec45662STushar Sugandhi 'y' : 'n'); 35148ec45662STushar Sugandhi DMEMIT(",no_read_workqueue=%c", test_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags) ? 35158ec45662STushar Sugandhi 'y' : 'n'); 35168ec45662STushar Sugandhi DMEMIT(",no_write_workqueue=%c", test_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags) ? 35178ec45662STushar Sugandhi 'y' : 'n'); 35188ec45662STushar Sugandhi DMEMIT(",iv_large_sectors=%c", test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags) ? 35198ec45662STushar Sugandhi 'y' : 'n'); 35208ec45662STushar Sugandhi 35218ec45662STushar Sugandhi if (cc->on_disk_tag_size) 35228ec45662STushar Sugandhi DMEMIT(",integrity_tag_size=%u,cipher_auth=%s", 35238ec45662STushar Sugandhi cc->on_disk_tag_size, cc->cipher_auth); 35248ec45662STushar Sugandhi if (cc->sector_size != (1 << SECTOR_SHIFT)) 35258ec45662STushar Sugandhi DMEMIT(",sector_size=%d", cc->sector_size); 35268ec45662STushar Sugandhi if (cc->cipher_string) 35278ec45662STushar Sugandhi DMEMIT(",cipher_string=%s", cc->cipher_string); 35288ec45662STushar Sugandhi 35298ec45662STushar Sugandhi DMEMIT(",key_size=%u", cc->key_size); 35308ec45662STushar Sugandhi DMEMIT(",key_parts=%u", cc->key_parts); 35318ec45662STushar Sugandhi DMEMIT(",key_extra_size=%u", cc->key_extra_size); 35328ec45662STushar Sugandhi DMEMIT(",key_mac_size=%u", cc->key_mac_size); 35338ec45662STushar Sugandhi DMEMIT(";"); 35341da177e4SLinus Torvalds break; 35351da177e4SLinus Torvalds } 35361da177e4SLinus Torvalds } 35371da177e4SLinus Torvalds 3538e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 3539e48d4bbfSMilan Broz { 3540e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3541e48d4bbfSMilan Broz 3542e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3543e48d4bbfSMilan Broz } 3544e48d4bbfSMilan Broz 3545e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 3546e48d4bbfSMilan Broz { 3547e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3548e48d4bbfSMilan Broz 3549e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 3550e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 3551e48d4bbfSMilan Broz return -EAGAIN; 3552e48d4bbfSMilan Broz } 3553e48d4bbfSMilan Broz 3554e48d4bbfSMilan Broz return 0; 3555e48d4bbfSMilan Broz } 3556e48d4bbfSMilan Broz 3557e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 3558e48d4bbfSMilan Broz { 3559e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3560e48d4bbfSMilan Broz 3561e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3562e48d4bbfSMilan Broz } 3563e48d4bbfSMilan Broz 3564e48d4bbfSMilan Broz /* Message interface 3565e48d4bbfSMilan Broz * key set <key> 3566e48d4bbfSMilan Broz * key wipe 3567e48d4bbfSMilan Broz */ 35681eb5fa84SMike Snitzer static int crypt_message(struct dm_target *ti, unsigned argc, char **argv, 35691eb5fa84SMike Snitzer char *result, unsigned maxlen) 3570e48d4bbfSMilan Broz { 3571e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3572c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 3573e48d4bbfSMilan Broz 3574e48d4bbfSMilan Broz if (argc < 2) 3575e48d4bbfSMilan Broz goto error; 3576e48d4bbfSMilan Broz 3577498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 3578e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 3579e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 3580e48d4bbfSMilan Broz return -EINVAL; 3581e48d4bbfSMilan Broz } 3582498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 3583c538f6ecSOndrej Kozina /* The key size may not be changed. */ 3584c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 3585c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 3586c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 3587c538f6ecSOndrej Kozina return -EINVAL; 3588c538f6ecSOndrej Kozina } 3589c538f6ecSOndrej Kozina 3590542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 3591542da317SMilan Broz if (ret) 3592542da317SMilan Broz return ret; 3593542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 3594542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 3595dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 3596dc94902bSOndrej Kozina if (cc->key_string) 3597dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 3598542da317SMilan Broz return ret; 3599542da317SMilan Broz } 36004a52ffc7SMilan Broz if (argc == 2 && !strcasecmp(argv[1], "wipe")) 3601e48d4bbfSMilan Broz return crypt_wipe_key(cc); 3602e48d4bbfSMilan Broz } 3603e48d4bbfSMilan Broz 3604e48d4bbfSMilan Broz error: 3605e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 3606e48d4bbfSMilan Broz return -EINVAL; 3607e48d4bbfSMilan Broz } 3608e48d4bbfSMilan Broz 3609af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 3610af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 3611af4874e0SMike Snitzer { 3612af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 3613af4874e0SMike Snitzer 36145dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 3615af4874e0SMike Snitzer } 3616af4874e0SMike Snitzer 3617586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 3618586b286bSMike Snitzer { 36198f0009a2SMilan Broz struct crypt_config *cc = ti->private; 36208f0009a2SMilan Broz 3621586b286bSMike Snitzer /* 3622586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 3623586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 3624586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 3625586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 3626586b286bSMike Snitzer */ 3627586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 36288f0009a2SMilan Broz 3629bc9e9cf0SMikulas Patocka limits->logical_block_size = 363064611a15SEric Biggers max_t(unsigned, limits->logical_block_size, cc->sector_size); 3631bc9e9cf0SMikulas Patocka limits->physical_block_size = 3632bc9e9cf0SMikulas Patocka max_t(unsigned, limits->physical_block_size, cc->sector_size); 3633bc9e9cf0SMikulas Patocka limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size); 3634586b286bSMike Snitzer } 3635586b286bSMike Snitzer 36361da177e4SLinus Torvalds static struct target_type crypt_target = { 36371da177e4SLinus Torvalds .name = "crypt", 3638363880c4SAhmad Fatoum .version = {1, 23, 0}, 36391da177e4SLinus Torvalds .module = THIS_MODULE, 36401da177e4SLinus Torvalds .ctr = crypt_ctr, 36411da177e4SLinus Torvalds .dtr = crypt_dtr, 36428e225f04SDamien Le Moal .features = DM_TARGET_ZONED_HM, 36438e225f04SDamien Le Moal .report_zones = crypt_report_zones, 36441da177e4SLinus Torvalds .map = crypt_map, 36451da177e4SLinus Torvalds .status = crypt_status, 3646e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 3647e48d4bbfSMilan Broz .preresume = crypt_preresume, 3648e48d4bbfSMilan Broz .resume = crypt_resume, 3649e48d4bbfSMilan Broz .message = crypt_message, 3650af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 3651586b286bSMike Snitzer .io_hints = crypt_io_hints, 36521da177e4SLinus Torvalds }; 36531da177e4SLinus Torvalds 36541da177e4SLinus Torvalds static int __init dm_crypt_init(void) 36551da177e4SLinus Torvalds { 36561da177e4SLinus Torvalds int r; 36571da177e4SLinus Torvalds 36581da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 365994f5e024SMikulas Patocka if (r < 0) 366072d94861SAlasdair G Kergon DMERR("register failed %d", r); 36611da177e4SLinus Torvalds 36621da177e4SLinus Torvalds return r; 36631da177e4SLinus Torvalds } 36641da177e4SLinus Torvalds 36651da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 36661da177e4SLinus Torvalds { 366710d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 36681da177e4SLinus Torvalds } 36691da177e4SLinus Torvalds 36701da177e4SLinus Torvalds module_init(dm_crypt_init); 36711da177e4SLinus Torvalds module_exit(dm_crypt_exit); 36721da177e4SLinus Torvalds 3673bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 36741da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 36751da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 3676