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 */ 37c538f6ecSOndrej Kozina #include <keys/user-type.h> 381da177e4SLinus Torvalds 39586e80e6SMikulas Patocka #include <linux/device-mapper.h> 401da177e4SLinus Torvalds 4172d94861SAlasdair G Kergon #define DM_MSG_PREFIX "crypt" 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* 441da177e4SLinus Torvalds * context holding the current state of a multi-part conversion 451da177e4SLinus Torvalds */ 461da177e4SLinus Torvalds struct convert_context { 4743d69034SMilan Broz struct completion restart; 481da177e4SLinus Torvalds struct bio *bio_in; 491da177e4SLinus Torvalds struct bio *bio_out; 50003b5c57SKent Overstreet struct bvec_iter iter_in; 51003b5c57SKent Overstreet struct bvec_iter iter_out; 528d683dcdSAliOS system security u64 cc_sector; 5340b6229bSMikulas Patocka atomic_t cc_pending; 54ef43aa38SMilan Broz union { 55bbdb23b5SHerbert Xu struct skcipher_request *req; 56ef43aa38SMilan Broz struct aead_request *req_aead; 57ef43aa38SMilan Broz } r; 58ef43aa38SMilan Broz 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 6153017030SMilan Broz /* 6253017030SMilan Broz * per bio private data 6353017030SMilan Broz */ 6453017030SMilan Broz struct dm_crypt_io { 6549a8a920SAlasdair G Kergon struct crypt_config *cc; 6653017030SMilan Broz struct bio *base_bio; 67ef43aa38SMilan Broz u8 *integrity_metadata; 68ef43aa38SMilan Broz bool integrity_metadata_from_pool; 6953017030SMilan Broz struct work_struct work; 7053017030SMilan Broz 7153017030SMilan Broz struct convert_context ctx; 7253017030SMilan Broz 7340b6229bSMikulas Patocka atomic_t io_pending; 744e4cbee9SChristoph Hellwig blk_status_t error; 750c395b0fSMilan Broz sector_t sector; 76dc267621SMikulas Patocka 77b3c5fd30SMikulas Patocka struct rb_node rb_node; 78298a9fa0SMikulas Patocka } CRYPTO_MINALIGN_ATTR; 7953017030SMilan Broz 8001482b76SMilan Broz struct dm_crypt_request { 81b2174eebSHuang Ying struct convert_context *ctx; 82ef43aa38SMilan Broz struct scatterlist sg_in[4]; 83ef43aa38SMilan Broz struct scatterlist sg_out[4]; 848d683dcdSAliOS system security u64 iv_sector; 8501482b76SMilan Broz }; 8601482b76SMilan Broz 871da177e4SLinus Torvalds struct crypt_config; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds struct crypt_iv_operations { 901da177e4SLinus Torvalds int (*ctr)(struct crypt_config *cc, struct dm_target *ti, 911da177e4SLinus Torvalds const char *opts); 921da177e4SLinus Torvalds void (*dtr)(struct crypt_config *cc); 93b95bf2d3SMilan Broz int (*init)(struct crypt_config *cc); 94542da317SMilan Broz int (*wipe)(struct crypt_config *cc); 952dc5327dSMilan Broz int (*generator)(struct crypt_config *cc, u8 *iv, 962dc5327dSMilan Broz struct dm_crypt_request *dmreq); 972dc5327dSMilan Broz int (*post)(struct crypt_config *cc, u8 *iv, 982dc5327dSMilan Broz struct dm_crypt_request *dmreq); 991da177e4SLinus Torvalds }; 1001da177e4SLinus Torvalds 10160473592SMilan Broz struct iv_benbi_private { 10260473592SMilan Broz int shift; 10360473592SMilan Broz }; 10460473592SMilan Broz 10534745785SMilan Broz #define LMK_SEED_SIZE 64 /* hash + 0 */ 10634745785SMilan Broz struct iv_lmk_private { 10734745785SMilan Broz struct crypto_shash *hash_tfm; 10834745785SMilan Broz u8 *seed; 10934745785SMilan Broz }; 11034745785SMilan Broz 111ed04d981SMilan Broz #define TCW_WHITENING_SIZE 16 112ed04d981SMilan Broz struct iv_tcw_private { 113ed04d981SMilan Broz struct crypto_shash *crc32_tfm; 114ed04d981SMilan Broz u8 *iv_seed; 115ed04d981SMilan Broz u8 *whitening; 116ed04d981SMilan Broz }; 117ed04d981SMilan Broz 118bbb16584SMilan Broz #define ELEPHANT_MAX_KEY_SIZE 32 119bbb16584SMilan Broz struct iv_elephant_private { 120bbb16584SMilan Broz struct crypto_skcipher *tfm; 121bbb16584SMilan Broz }; 122bbb16584SMilan Broz 1231da177e4SLinus Torvalds /* 1241da177e4SLinus Torvalds * Crypt: maps a linear range of a block device 1251da177e4SLinus Torvalds * and encrypts / decrypts at the same time. 1261da177e4SLinus Torvalds */ 1270f5d8e6eSMikulas Patocka enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, 128f659b100SRabin Vincent DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; 129c0297721SAndi Kleen 130ef43aa38SMilan Broz enum cipher_flags { 131ef43aa38SMilan Broz CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */ 1328f0009a2SMilan Broz CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ 133bbb16584SMilan Broz CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ 134ef43aa38SMilan Broz }; 135ef43aa38SMilan Broz 136c0297721SAndi Kleen /* 137610f2de3SMikulas Patocka * The fields in here must be read only after initialization. 138c0297721SAndi Kleen */ 1391da177e4SLinus Torvalds struct crypt_config { 1401da177e4SLinus Torvalds struct dm_dev *dev; 1411da177e4SLinus Torvalds sector_t start; 1421da177e4SLinus Torvalds 1435059353dSMikulas Patocka struct percpu_counter n_allocated_pages; 1445059353dSMikulas Patocka 145cabf08e4SMilan Broz struct workqueue_struct *io_queue; 146cabf08e4SMilan Broz struct workqueue_struct *crypt_queue; 1473f1e9070SMilan Broz 148c7329effSMikulas Patocka spinlock_t write_thread_lock; 14972d711c8SMike Snitzer struct task_struct *write_thread; 150b3c5fd30SMikulas Patocka struct rb_root write_tree; 151dc267621SMikulas Patocka 1527dbcd137SMilan Broz char *cipher_string; 153ef43aa38SMilan Broz char *cipher_auth; 154c538f6ecSOndrej Kozina char *key_string; 1555ebaee6dSMilan Broz 1561b1b58f5SJulia Lawall const struct crypt_iv_operations *iv_gen_ops; 15779066ad3SHerbert Xu union { 15860473592SMilan Broz struct iv_benbi_private benbi; 15934745785SMilan Broz struct iv_lmk_private lmk; 160ed04d981SMilan Broz struct iv_tcw_private tcw; 161bbb16584SMilan Broz struct iv_elephant_private elephant; 16279066ad3SHerbert Xu } iv_gen_private; 1638d683dcdSAliOS system security u64 iv_offset; 1641da177e4SLinus Torvalds unsigned int iv_size; 165ff3af92bSMikulas Patocka unsigned short int sector_size; 166ff3af92bSMikulas Patocka unsigned char sector_shift; 1671da177e4SLinus Torvalds 168ef43aa38SMilan Broz union { 169bbdb23b5SHerbert Xu struct crypto_skcipher **tfms; 170ef43aa38SMilan Broz struct crypto_aead **tfms_aead; 171ef43aa38SMilan Broz } cipher_tfm; 172d1f96423SMilan Broz unsigned tfms_count; 173ef43aa38SMilan Broz unsigned long cipher_flags; 174c0297721SAndi Kleen 175c0297721SAndi Kleen /* 176ddd42edfSMilan Broz * Layout of each crypto request: 177ddd42edfSMilan Broz * 178bbdb23b5SHerbert Xu * struct skcipher_request 179ddd42edfSMilan Broz * context 180ddd42edfSMilan Broz * padding 181ddd42edfSMilan Broz * struct dm_crypt_request 182ddd42edfSMilan Broz * padding 183ddd42edfSMilan Broz * IV 184ddd42edfSMilan Broz * 185ddd42edfSMilan Broz * The padding is added so that dm_crypt_request and the IV are 186ddd42edfSMilan Broz * correctly aligned. 187ddd42edfSMilan Broz */ 188ddd42edfSMilan Broz unsigned int dmreq_start; 189ddd42edfSMilan Broz 190298a9fa0SMikulas Patocka unsigned int per_bio_data_size; 191298a9fa0SMikulas Patocka 192e48d4bbfSMilan Broz unsigned long flags; 1931da177e4SLinus Torvalds unsigned int key_size; 194da31a078SMilan Broz unsigned int key_parts; /* independent parts in key buffer */ 195da31a078SMilan Broz unsigned int key_extra_size; /* additional keys length */ 196ef43aa38SMilan Broz unsigned int key_mac_size; /* MAC key size for authenc(...) */ 197ef43aa38SMilan Broz 198ef43aa38SMilan Broz unsigned int integrity_tag_size; 199ef43aa38SMilan Broz unsigned int integrity_iv_size; 200ef43aa38SMilan Broz unsigned int on_disk_tag_size; 201ef43aa38SMilan Broz 20272d711c8SMike Snitzer /* 20372d711c8SMike Snitzer * pool for per bio private data, crypto requests, 20472d711c8SMike Snitzer * encryption requeusts/buffer pages and integrity tags 20572d711c8SMike Snitzer */ 20672d711c8SMike Snitzer unsigned tag_pool_max_sectors; 20772d711c8SMike Snitzer mempool_t tag_pool; 20872d711c8SMike Snitzer mempool_t req_pool; 20972d711c8SMike Snitzer mempool_t page_pool; 21072d711c8SMike Snitzer 21172d711c8SMike Snitzer struct bio_set bs; 21272d711c8SMike Snitzer struct mutex bio_alloc_lock; 21372d711c8SMike Snitzer 214ef43aa38SMilan Broz u8 *authenc_key; /* space for keys in authenc() format (if used) */ 2151da177e4SLinus Torvalds u8 key[0]; 2161da177e4SLinus Torvalds }; 2171da177e4SLinus Torvalds 2180a83df6cSMikulas Patocka #define MIN_IOS 64 219ef43aa38SMilan Broz #define MAX_TAG_SIZE 480 220ef43aa38SMilan Broz #define POOL_ENTRY_SIZE 512 2211da177e4SLinus Torvalds 2225059353dSMikulas Patocka static DEFINE_SPINLOCK(dm_crypt_clients_lock); 2235059353dSMikulas Patocka static unsigned dm_crypt_clients_n = 0; 2245059353dSMikulas Patocka static volatile unsigned long dm_crypt_pages_per_client; 2255059353dSMikulas Patocka #define DM_CRYPT_MEMORY_PERCENT 2 2265059353dSMikulas Patocka #define DM_CRYPT_MIN_PAGES_PER_CLIENT (BIO_MAX_PAGES * 16) 2275059353dSMikulas Patocka 228028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *, struct bio *); 229395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io); 230ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 231ef43aa38SMilan Broz struct scatterlist *sg); 232027581f3SOlaf Kirch 2333fd53533SYang Yingliang static bool crypt_integrity_aead(struct crypt_config *cc); 2343fd53533SYang Yingliang 235c0297721SAndi Kleen /* 23686f917adSEric Biggers * Use this to access cipher attributes that are independent of the key. 237c0297721SAndi Kleen */ 238bbdb23b5SHerbert Xu static struct crypto_skcipher *any_tfm(struct crypt_config *cc) 239c0297721SAndi Kleen { 240ef43aa38SMilan Broz return cc->cipher_tfm.tfms[0]; 241ef43aa38SMilan Broz } 242ef43aa38SMilan Broz 243ef43aa38SMilan Broz static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) 244ef43aa38SMilan Broz { 245ef43aa38SMilan Broz return cc->cipher_tfm.tfms_aead[0]; 246c0297721SAndi Kleen } 247c0297721SAndi Kleen 2481da177e4SLinus Torvalds /* 2491da177e4SLinus Torvalds * Different IV generation algorithms: 2501da177e4SLinus Torvalds * 2513c164bd8SRik Snel * plain: the initial vector is the 32-bit little-endian version of the sector 2523a4fa0a2SRobert P. J. Day * number, padded with zeros if necessary. 2531da177e4SLinus Torvalds * 25461afef61SMilan Broz * plain64: the initial vector is the 64-bit little-endian version of the sector 25561afef61SMilan Broz * number, padded with zeros if necessary. 25661afef61SMilan Broz * 2577e3fd855SMilan Broz * plain64be: the initial vector is the 64-bit big-endian version of the sector 2587e3fd855SMilan Broz * number, padded with zeros if necessary. 2597e3fd855SMilan Broz * 2603c164bd8SRik Snel * essiv: "encrypted sector|salt initial vector", the sector number is 2611da177e4SLinus Torvalds * encrypted with the bulk cipher using a salt as key. The salt 2621da177e4SLinus Torvalds * should be derived from the bulk cipher's key via hashing. 2631da177e4SLinus Torvalds * 26448527fa7SRik Snel * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 26548527fa7SRik Snel * (needed for LRW-32-AES and possible other narrow block modes) 26648527fa7SRik Snel * 26746b47730SLudwig Nussel * null: the initial vector is always zero. Provides compatibility with 26846b47730SLudwig Nussel * obsolete loop_fish2 devices. Do not use for new devices. 26946b47730SLudwig Nussel * 27034745785SMilan Broz * lmk: Compatible implementation of the block chaining mode used 27134745785SMilan Broz * by the Loop-AES block device encryption system 27234745785SMilan Broz * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ 27334745785SMilan Broz * It operates on full 512 byte sectors and uses CBC 27434745785SMilan Broz * with an IV derived from the sector number, the data and 27534745785SMilan Broz * optionally extra IV seed. 27634745785SMilan Broz * This means that after decryption the first block 27734745785SMilan Broz * of sector must be tweaked according to decrypted data. 27834745785SMilan Broz * Loop-AES can use three encryption schemes: 27934745785SMilan Broz * version 1: is plain aes-cbc mode 28034745785SMilan Broz * version 2: uses 64 multikey scheme with lmk IV generator 28134745785SMilan Broz * version 3: the same as version 2 with additional IV seed 28234745785SMilan Broz * (it uses 65 keys, last key is used as IV seed) 28334745785SMilan Broz * 284ed04d981SMilan Broz * tcw: Compatible implementation of the block chaining mode used 285ed04d981SMilan Broz * by the TrueCrypt device encryption system (prior to version 4.1). 286e44f23b3SMilan Broz * For more info see: https://gitlab.com/cryptsetup/cryptsetup/wikis/TrueCryptOnDiskFormat 287ed04d981SMilan Broz * It operates on full 512 byte sectors and uses CBC 288ed04d981SMilan Broz * with an IV derived from initial key and the sector number. 289ed04d981SMilan Broz * In addition, whitening value is applied on every sector, whitening 290ed04d981SMilan Broz * is calculated from initial key, sector number and mixed using CRC32. 291ed04d981SMilan Broz * Note that this encryption scheme is vulnerable to watermarking attacks 292ed04d981SMilan Broz * and should be used for old compatible containers access only. 293b9411d73SMilan Broz * 294b9411d73SMilan Broz * eboiv: Encrypted byte-offset IV (used in Bitlocker in CBC mode) 295b9411d73SMilan Broz * The IV is encrypted little-endian byte-offset (with the same key 296b9411d73SMilan Broz * and cipher as the volume). 297bbb16584SMilan Broz * 298bbb16584SMilan Broz * elephant: The extended version of eboiv with additional Elephant diffuser 299bbb16584SMilan Broz * used with Bitlocker CBC mode. 300bbb16584SMilan Broz * This mode was used in older Windows systems 301bbb16584SMilan Broz * http://download.microsoft.com/download/0/2/3/0238acaf-d3bf-4a6d-b3d6-0a0be4bbb36e/bitlockercipher200608.pdf 3021da177e4SLinus Torvalds */ 3031da177e4SLinus Torvalds 3042dc5327dSMilan Broz static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, 3052dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 308283a8328SAlasdair G Kergon *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds return 0; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 31361afef61SMilan Broz static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, 3142dc5327dSMilan Broz struct dm_crypt_request *dmreq) 31561afef61SMilan Broz { 31661afef61SMilan Broz memset(iv, 0, cc->iv_size); 317283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 31861afef61SMilan Broz 31961afef61SMilan Broz return 0; 32061afef61SMilan Broz } 32161afef61SMilan Broz 3227e3fd855SMilan Broz static int crypt_iv_plain64be_gen(struct crypt_config *cc, u8 *iv, 3237e3fd855SMilan Broz struct dm_crypt_request *dmreq) 3247e3fd855SMilan Broz { 3257e3fd855SMilan Broz memset(iv, 0, cc->iv_size); 3267e3fd855SMilan Broz /* iv_size is at least of size u64; usually it is 16 bytes */ 3277e3fd855SMilan Broz *(__be64 *)&iv[cc->iv_size - sizeof(u64)] = cpu_to_be64(dmreq->iv_sector); 3287e3fd855SMilan Broz 3297e3fd855SMilan Broz return 0; 3307e3fd855SMilan Broz } 3317e3fd855SMilan Broz 3322dc5327dSMilan Broz static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, 3332dc5327dSMilan Broz struct dm_crypt_request *dmreq) 3341da177e4SLinus Torvalds { 335a1a262b6SArd Biesheuvel /* 336a1a262b6SArd Biesheuvel * ESSIV encryption of the IV is now handled by the crypto API, 337a1a262b6SArd Biesheuvel * so just pass the plain sector number here. 338a1a262b6SArd Biesheuvel */ 3391da177e4SLinus Torvalds memset(iv, 0, cc->iv_size); 340283a8328SAlasdair G Kergon *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); 341c0297721SAndi Kleen 3421da177e4SLinus Torvalds return 0; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 34548527fa7SRik Snel static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, 34648527fa7SRik Snel const char *opts) 34748527fa7SRik Snel { 3484ea9471fSMilan Broz unsigned bs; 3494ea9471fSMilan Broz int log; 3504ea9471fSMilan Broz 3513fd53533SYang Yingliang if (crypt_integrity_aead(cc)) 3524ea9471fSMilan Broz bs = crypto_aead_blocksize(any_tfm_aead(cc)); 3534ea9471fSMilan Broz else 3544ea9471fSMilan Broz bs = crypto_skcipher_blocksize(any_tfm(cc)); 3554ea9471fSMilan Broz log = ilog2(bs); 35648527fa7SRik Snel 35748527fa7SRik Snel /* we need to calculate how far we must shift the sector count 35848527fa7SRik Snel * to get the cipher block count, we use this shift in _gen */ 35948527fa7SRik Snel 36048527fa7SRik Snel if (1 << log != bs) { 36148527fa7SRik Snel ti->error = "cypher blocksize is not a power of 2"; 36248527fa7SRik Snel return -EINVAL; 36348527fa7SRik Snel } 36448527fa7SRik Snel 36548527fa7SRik Snel if (log > 9) { 36648527fa7SRik Snel ti->error = "cypher blocksize is > 512"; 36748527fa7SRik Snel return -EINVAL; 36848527fa7SRik Snel } 36948527fa7SRik Snel 37060473592SMilan Broz cc->iv_gen_private.benbi.shift = 9 - log; 37148527fa7SRik Snel 37248527fa7SRik Snel return 0; 37348527fa7SRik Snel } 37448527fa7SRik Snel 37548527fa7SRik Snel static void crypt_iv_benbi_dtr(struct crypt_config *cc) 37648527fa7SRik Snel { 37748527fa7SRik Snel } 37848527fa7SRik Snel 3792dc5327dSMilan Broz static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, 3802dc5327dSMilan Broz struct dm_crypt_request *dmreq) 38148527fa7SRik Snel { 38279066ad3SHerbert Xu __be64 val; 38379066ad3SHerbert Xu 38448527fa7SRik Snel memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ 38579066ad3SHerbert Xu 3862dc5327dSMilan Broz val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); 38779066ad3SHerbert Xu put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); 38848527fa7SRik Snel 3891da177e4SLinus Torvalds return 0; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3922dc5327dSMilan Broz static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, 3932dc5327dSMilan Broz struct dm_crypt_request *dmreq) 39446b47730SLudwig Nussel { 39546b47730SLudwig Nussel memset(iv, 0, cc->iv_size); 39646b47730SLudwig Nussel 39746b47730SLudwig Nussel return 0; 39846b47730SLudwig Nussel } 39946b47730SLudwig Nussel 40034745785SMilan Broz static void crypt_iv_lmk_dtr(struct crypt_config *cc) 40134745785SMilan Broz { 40234745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 40334745785SMilan Broz 40434745785SMilan Broz if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) 40534745785SMilan Broz crypto_free_shash(lmk->hash_tfm); 40634745785SMilan Broz lmk->hash_tfm = NULL; 40734745785SMilan Broz 40834745785SMilan Broz kzfree(lmk->seed); 40934745785SMilan Broz lmk->seed = NULL; 41034745785SMilan Broz } 41134745785SMilan Broz 41234745785SMilan Broz static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, 41334745785SMilan Broz const char *opts) 41434745785SMilan Broz { 41534745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 41634745785SMilan Broz 4178f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 4188f0009a2SMilan Broz ti->error = "Unsupported sector size for LMK"; 4198f0009a2SMilan Broz return -EINVAL; 4208f0009a2SMilan Broz } 4218f0009a2SMilan Broz 42234745785SMilan Broz lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); 42334745785SMilan Broz if (IS_ERR(lmk->hash_tfm)) { 42434745785SMilan Broz ti->error = "Error initializing LMK hash"; 42534745785SMilan Broz return PTR_ERR(lmk->hash_tfm); 42634745785SMilan Broz } 42734745785SMilan Broz 42834745785SMilan Broz /* No seed in LMK version 2 */ 42934745785SMilan Broz if (cc->key_parts == cc->tfms_count) { 43034745785SMilan Broz lmk->seed = NULL; 43134745785SMilan Broz return 0; 43234745785SMilan Broz } 43334745785SMilan Broz 43434745785SMilan Broz lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); 43534745785SMilan Broz if (!lmk->seed) { 43634745785SMilan Broz crypt_iv_lmk_dtr(cc); 43734745785SMilan Broz ti->error = "Error kmallocing seed storage in LMK"; 43834745785SMilan Broz return -ENOMEM; 43934745785SMilan Broz } 44034745785SMilan Broz 44134745785SMilan Broz return 0; 44234745785SMilan Broz } 44334745785SMilan Broz 44434745785SMilan Broz static int crypt_iv_lmk_init(struct crypt_config *cc) 44534745785SMilan Broz { 44634745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 44734745785SMilan Broz int subkey_size = cc->key_size / cc->key_parts; 44834745785SMilan Broz 44934745785SMilan Broz /* LMK seed is on the position of LMK_KEYS + 1 key */ 45034745785SMilan Broz if (lmk->seed) 45134745785SMilan Broz memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), 45234745785SMilan Broz crypto_shash_digestsize(lmk->hash_tfm)); 45334745785SMilan Broz 45434745785SMilan Broz return 0; 45534745785SMilan Broz } 45634745785SMilan Broz 45734745785SMilan Broz static int crypt_iv_lmk_wipe(struct crypt_config *cc) 45834745785SMilan Broz { 45934745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 46034745785SMilan Broz 46134745785SMilan Broz if (lmk->seed) 46234745785SMilan Broz memset(lmk->seed, 0, LMK_SEED_SIZE); 46334745785SMilan Broz 46434745785SMilan Broz return 0; 46534745785SMilan Broz } 46634745785SMilan Broz 46734745785SMilan Broz static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, 46834745785SMilan Broz struct dm_crypt_request *dmreq, 46934745785SMilan Broz u8 *data) 47034745785SMilan Broz { 47134745785SMilan Broz struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; 472b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); 47334745785SMilan Broz struct md5_state md5state; 474da31a078SMilan Broz __le32 buf[4]; 47534745785SMilan Broz int i, r; 47634745785SMilan Broz 477b6106265SJan-Simon Möller desc->tfm = lmk->hash_tfm; 47834745785SMilan Broz 479b6106265SJan-Simon Möller r = crypto_shash_init(desc); 48034745785SMilan Broz if (r) 48134745785SMilan Broz return r; 48234745785SMilan Broz 48334745785SMilan Broz if (lmk->seed) { 484b6106265SJan-Simon Möller r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); 48534745785SMilan Broz if (r) 48634745785SMilan Broz return r; 48734745785SMilan Broz } 48834745785SMilan Broz 48934745785SMilan Broz /* Sector is always 512B, block size 16, add data of blocks 1-31 */ 490b6106265SJan-Simon Möller r = crypto_shash_update(desc, data + 16, 16 * 31); 49134745785SMilan Broz if (r) 49234745785SMilan Broz return r; 49334745785SMilan Broz 49434745785SMilan Broz /* Sector is cropped to 56 bits here */ 49534745785SMilan Broz buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); 49634745785SMilan Broz buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); 49734745785SMilan Broz buf[2] = cpu_to_le32(4024); 49834745785SMilan Broz buf[3] = 0; 499b6106265SJan-Simon Möller r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); 50034745785SMilan Broz if (r) 50134745785SMilan Broz return r; 50234745785SMilan Broz 50334745785SMilan Broz /* No MD5 padding here */ 504b6106265SJan-Simon Möller r = crypto_shash_export(desc, &md5state); 50534745785SMilan Broz if (r) 50634745785SMilan Broz return r; 50734745785SMilan Broz 50834745785SMilan Broz for (i = 0; i < MD5_HASH_WORDS; i++) 50934745785SMilan Broz __cpu_to_le32s(&md5state.hash[i]); 51034745785SMilan Broz memcpy(iv, &md5state.hash, cc->iv_size); 51134745785SMilan Broz 51234745785SMilan Broz return 0; 51334745785SMilan Broz } 51434745785SMilan Broz 51534745785SMilan Broz static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, 51634745785SMilan Broz struct dm_crypt_request *dmreq) 51734745785SMilan Broz { 518ef43aa38SMilan Broz struct scatterlist *sg; 51934745785SMilan Broz u8 *src; 52034745785SMilan Broz int r = 0; 52134745785SMilan Broz 52234745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 523ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 524ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 525ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); 526c2e022cbSCong Wang kunmap_atomic(src); 52734745785SMilan Broz } else 52834745785SMilan Broz memset(iv, 0, cc->iv_size); 52934745785SMilan Broz 53034745785SMilan Broz return r; 53134745785SMilan Broz } 53234745785SMilan Broz 53334745785SMilan Broz static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, 53434745785SMilan Broz struct dm_crypt_request *dmreq) 53534745785SMilan Broz { 536ef43aa38SMilan Broz struct scatterlist *sg; 53734745785SMilan Broz u8 *dst; 53834745785SMilan Broz int r; 53934745785SMilan Broz 54034745785SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) 54134745785SMilan Broz return 0; 54234745785SMilan Broz 543ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 544ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 545ef43aa38SMilan Broz r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); 54634745785SMilan Broz 54734745785SMilan Broz /* Tweak the first block of plaintext sector */ 54834745785SMilan Broz if (!r) 549ef43aa38SMilan Broz crypto_xor(dst + sg->offset, iv, cc->iv_size); 55034745785SMilan Broz 551c2e022cbSCong Wang kunmap_atomic(dst); 55234745785SMilan Broz return r; 55334745785SMilan Broz } 55434745785SMilan Broz 555ed04d981SMilan Broz static void crypt_iv_tcw_dtr(struct crypt_config *cc) 556ed04d981SMilan Broz { 557ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 558ed04d981SMilan Broz 559ed04d981SMilan Broz kzfree(tcw->iv_seed); 560ed04d981SMilan Broz tcw->iv_seed = NULL; 561ed04d981SMilan Broz kzfree(tcw->whitening); 562ed04d981SMilan Broz tcw->whitening = NULL; 563ed04d981SMilan Broz 564ed04d981SMilan Broz if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) 565ed04d981SMilan Broz crypto_free_shash(tcw->crc32_tfm); 566ed04d981SMilan Broz tcw->crc32_tfm = NULL; 567ed04d981SMilan Broz } 568ed04d981SMilan Broz 569ed04d981SMilan Broz static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, 570ed04d981SMilan Broz const char *opts) 571ed04d981SMilan Broz { 572ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 573ed04d981SMilan Broz 5748f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) { 5758f0009a2SMilan Broz ti->error = "Unsupported sector size for TCW"; 5768f0009a2SMilan Broz return -EINVAL; 5778f0009a2SMilan Broz } 5788f0009a2SMilan Broz 579ed04d981SMilan Broz if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { 580ed04d981SMilan Broz ti->error = "Wrong key size for TCW"; 581ed04d981SMilan Broz return -EINVAL; 582ed04d981SMilan Broz } 583ed04d981SMilan Broz 584ed04d981SMilan Broz tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); 585ed04d981SMilan Broz if (IS_ERR(tcw->crc32_tfm)) { 586ed04d981SMilan Broz ti->error = "Error initializing CRC32 in TCW"; 587ed04d981SMilan Broz return PTR_ERR(tcw->crc32_tfm); 588ed04d981SMilan Broz } 589ed04d981SMilan Broz 590ed04d981SMilan Broz tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); 591ed04d981SMilan Broz tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); 592ed04d981SMilan Broz if (!tcw->iv_seed || !tcw->whitening) { 593ed04d981SMilan Broz crypt_iv_tcw_dtr(cc); 594ed04d981SMilan Broz ti->error = "Error allocating seed storage in TCW"; 595ed04d981SMilan Broz return -ENOMEM; 596ed04d981SMilan Broz } 597ed04d981SMilan Broz 598ed04d981SMilan Broz return 0; 599ed04d981SMilan Broz } 600ed04d981SMilan Broz 601ed04d981SMilan Broz static int crypt_iv_tcw_init(struct crypt_config *cc) 602ed04d981SMilan Broz { 603ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 604ed04d981SMilan Broz int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; 605ed04d981SMilan Broz 606ed04d981SMilan Broz memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); 607ed04d981SMilan Broz memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], 608ed04d981SMilan Broz TCW_WHITENING_SIZE); 609ed04d981SMilan Broz 610ed04d981SMilan Broz return 0; 611ed04d981SMilan Broz } 612ed04d981SMilan Broz 613ed04d981SMilan Broz static int crypt_iv_tcw_wipe(struct crypt_config *cc) 614ed04d981SMilan Broz { 615ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 616ed04d981SMilan Broz 617ed04d981SMilan Broz memset(tcw->iv_seed, 0, cc->iv_size); 618ed04d981SMilan Broz memset(tcw->whitening, 0, TCW_WHITENING_SIZE); 619ed04d981SMilan Broz 620ed04d981SMilan Broz return 0; 621ed04d981SMilan Broz } 622ed04d981SMilan Broz 623ed04d981SMilan Broz static int crypt_iv_tcw_whitening(struct crypt_config *cc, 624ed04d981SMilan Broz struct dm_crypt_request *dmreq, 625ed04d981SMilan Broz u8 *data) 626ed04d981SMilan Broz { 627ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 628350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 629ed04d981SMilan Broz u8 buf[TCW_WHITENING_SIZE]; 630b6106265SJan-Simon Möller SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); 631ed04d981SMilan Broz int i, r; 632ed04d981SMilan Broz 633ed04d981SMilan Broz /* xor whitening with sector number */ 63445fe93dfSArd Biesheuvel crypto_xor_cpy(buf, tcw->whitening, (u8 *)§or, 8); 63545fe93dfSArd Biesheuvel crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)§or, 8); 636ed04d981SMilan Broz 637ed04d981SMilan Broz /* calculate crc32 for every 32bit part and xor it */ 638b6106265SJan-Simon Möller desc->tfm = tcw->crc32_tfm; 639ed04d981SMilan Broz for (i = 0; i < 4; i++) { 640b6106265SJan-Simon Möller r = crypto_shash_init(desc); 641ed04d981SMilan Broz if (r) 642ed04d981SMilan Broz goto out; 643b6106265SJan-Simon Möller r = crypto_shash_update(desc, &buf[i * 4], 4); 644ed04d981SMilan Broz if (r) 645ed04d981SMilan Broz goto out; 646b6106265SJan-Simon Möller r = crypto_shash_final(desc, &buf[i * 4]); 647ed04d981SMilan Broz if (r) 648ed04d981SMilan Broz goto out; 649ed04d981SMilan Broz } 650ed04d981SMilan Broz crypto_xor(&buf[0], &buf[12], 4); 651ed04d981SMilan Broz crypto_xor(&buf[4], &buf[8], 4); 652ed04d981SMilan Broz 653ed04d981SMilan Broz /* apply whitening (8 bytes) to whole sector */ 654ed04d981SMilan Broz for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) 655ed04d981SMilan Broz crypto_xor(data + i * 8, buf, 8); 656ed04d981SMilan Broz out: 6571a71d6ffSMilan Broz memzero_explicit(buf, sizeof(buf)); 658ed04d981SMilan Broz return r; 659ed04d981SMilan Broz } 660ed04d981SMilan Broz 661ed04d981SMilan Broz static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, 662ed04d981SMilan Broz struct dm_crypt_request *dmreq) 663ed04d981SMilan Broz { 664ef43aa38SMilan Broz struct scatterlist *sg; 665ed04d981SMilan Broz struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; 666350b5393SBart Van Assche __le64 sector = cpu_to_le64(dmreq->iv_sector); 667ed04d981SMilan Broz u8 *src; 668ed04d981SMilan Broz int r = 0; 669ed04d981SMilan Broz 670ed04d981SMilan Broz /* Remove whitening from ciphertext */ 671ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 672ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_in); 673ef43aa38SMilan Broz src = kmap_atomic(sg_page(sg)); 674ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); 675ed04d981SMilan Broz kunmap_atomic(src); 676ed04d981SMilan Broz } 677ed04d981SMilan Broz 678ed04d981SMilan Broz /* Calculate IV */ 67945fe93dfSArd Biesheuvel crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)§or, 8); 680ed04d981SMilan Broz if (cc->iv_size > 8) 68145fe93dfSArd Biesheuvel crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)§or, 68245fe93dfSArd Biesheuvel cc->iv_size - 8); 683ed04d981SMilan Broz 684ed04d981SMilan Broz return r; 685ed04d981SMilan Broz } 686ed04d981SMilan Broz 687ed04d981SMilan Broz static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, 688ed04d981SMilan Broz struct dm_crypt_request *dmreq) 689ed04d981SMilan Broz { 690ef43aa38SMilan Broz struct scatterlist *sg; 691ed04d981SMilan Broz u8 *dst; 692ed04d981SMilan Broz int r; 693ed04d981SMilan Broz 694ed04d981SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 695ed04d981SMilan Broz return 0; 696ed04d981SMilan Broz 697ed04d981SMilan Broz /* Apply whitening on ciphertext */ 698ef43aa38SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 699ef43aa38SMilan Broz dst = kmap_atomic(sg_page(sg)); 700ef43aa38SMilan Broz r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); 701ed04d981SMilan Broz kunmap_atomic(dst); 702ed04d981SMilan Broz 703ed04d981SMilan Broz return r; 704ed04d981SMilan Broz } 705ed04d981SMilan Broz 706ef43aa38SMilan Broz static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, 707ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 708ef43aa38SMilan Broz { 709ef43aa38SMilan Broz /* Used only for writes, there must be an additional space to store IV */ 710ef43aa38SMilan Broz get_random_bytes(iv, cc->iv_size); 711ef43aa38SMilan Broz return 0; 712ef43aa38SMilan Broz } 713ef43aa38SMilan Broz 714b9411d73SMilan Broz static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti, 715b9411d73SMilan Broz const char *opts) 716b9411d73SMilan Broz { 7173fd53533SYang Yingliang if (crypt_integrity_aead(cc)) { 71839d13a1aSArd Biesheuvel ti->error = "AEAD transforms not supported for EBOIV"; 719b9411d73SMilan Broz return -EINVAL; 720b9411d73SMilan Broz } 721b9411d73SMilan Broz 72239d13a1aSArd Biesheuvel if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) { 72339d13a1aSArd Biesheuvel ti->error = "Block size of EBOIV cipher does " 72439d13a1aSArd Biesheuvel "not match IV size of block cipher"; 72539d13a1aSArd Biesheuvel return -EINVAL; 726b9411d73SMilan Broz } 727b9411d73SMilan Broz 728b9411d73SMilan Broz return 0; 729b9411d73SMilan Broz } 730b9411d73SMilan Broz 731b9411d73SMilan Broz static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv, 732b9411d73SMilan Broz struct dm_crypt_request *dmreq) 733b9411d73SMilan Broz { 73439d13a1aSArd Biesheuvel u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64)); 73539d13a1aSArd Biesheuvel struct skcipher_request *req; 73639d13a1aSArd Biesheuvel struct scatterlist src, dst; 73739d13a1aSArd Biesheuvel struct crypto_wait wait; 73839d13a1aSArd Biesheuvel int err; 739b9411d73SMilan Broz 7409402e959SMikulas Patocka req = skcipher_request_alloc(any_tfm(cc), GFP_NOIO); 74139d13a1aSArd Biesheuvel if (!req) 74239d13a1aSArd Biesheuvel return -ENOMEM; 743b9411d73SMilan Broz 74439d13a1aSArd Biesheuvel memset(buf, 0, cc->iv_size); 74539d13a1aSArd Biesheuvel *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 74639d13a1aSArd Biesheuvel 74739d13a1aSArd Biesheuvel sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size); 74839d13a1aSArd Biesheuvel sg_init_one(&dst, iv, cc->iv_size); 74939d13a1aSArd Biesheuvel skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf); 75039d13a1aSArd Biesheuvel skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 75139d13a1aSArd Biesheuvel err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 75239d13a1aSArd Biesheuvel skcipher_request_free(req); 75339d13a1aSArd Biesheuvel 75439d13a1aSArd Biesheuvel return err; 755b9411d73SMilan Broz } 756b9411d73SMilan Broz 757bbb16584SMilan Broz static void crypt_iv_elephant_dtr(struct crypt_config *cc) 758bbb16584SMilan Broz { 759bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 760bbb16584SMilan Broz 761bbb16584SMilan Broz crypto_free_skcipher(elephant->tfm); 762bbb16584SMilan Broz elephant->tfm = NULL; 763bbb16584SMilan Broz } 764bbb16584SMilan Broz 765bbb16584SMilan Broz static int crypt_iv_elephant_ctr(struct crypt_config *cc, struct dm_target *ti, 766bbb16584SMilan Broz const char *opts) 767bbb16584SMilan Broz { 768bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 769bbb16584SMilan Broz int r; 770bbb16584SMilan Broz 771bbb16584SMilan Broz elephant->tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0); 772bbb16584SMilan Broz if (IS_ERR(elephant->tfm)) { 773bbb16584SMilan Broz r = PTR_ERR(elephant->tfm); 774bbb16584SMilan Broz elephant->tfm = NULL; 775bbb16584SMilan Broz return r; 776bbb16584SMilan Broz } 777bbb16584SMilan Broz 778bbb16584SMilan Broz r = crypt_iv_eboiv_ctr(cc, ti, NULL); 779bbb16584SMilan Broz if (r) 780bbb16584SMilan Broz crypt_iv_elephant_dtr(cc); 781bbb16584SMilan Broz return r; 782bbb16584SMilan Broz } 783bbb16584SMilan Broz 784bbb16584SMilan Broz static void diffuser_disk_to_cpu(u32 *d, size_t n) 785bbb16584SMilan Broz { 786bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 787bbb16584SMilan Broz int i; 788bbb16584SMilan Broz 789bbb16584SMilan Broz for (i = 0; i < n; i++) 790bbb16584SMilan Broz d[i] = le32_to_cpu((__le32)d[i]); 791bbb16584SMilan Broz #endif 792bbb16584SMilan Broz } 793bbb16584SMilan Broz 794bbb16584SMilan Broz static void diffuser_cpu_to_disk(__le32 *d, size_t n) 795bbb16584SMilan Broz { 796bbb16584SMilan Broz #ifndef __LITTLE_ENDIAN 797bbb16584SMilan Broz int i; 798bbb16584SMilan Broz 799bbb16584SMilan Broz for (i = 0; i < n; i++) 800bbb16584SMilan Broz d[i] = cpu_to_le32((u32)d[i]); 801bbb16584SMilan Broz #endif 802bbb16584SMilan Broz } 803bbb16584SMilan Broz 804bbb16584SMilan Broz static void diffuser_a_decrypt(u32 *d, size_t n) 805bbb16584SMilan Broz { 806bbb16584SMilan Broz int i, i1, i2, i3; 807bbb16584SMilan Broz 808bbb16584SMilan Broz for (i = 0; i < 5; i++) { 809bbb16584SMilan Broz i1 = 0; 810bbb16584SMilan Broz i2 = n - 2; 811bbb16584SMilan Broz i3 = n - 5; 812bbb16584SMilan Broz 813bbb16584SMilan Broz while (i1 < (n - 1)) { 814bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 815bbb16584SMilan Broz i1++; i2++; i3++; 816bbb16584SMilan Broz 817bbb16584SMilan Broz if (i3 >= n) 818bbb16584SMilan Broz i3 -= n; 819bbb16584SMilan Broz 820bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 821bbb16584SMilan Broz i1++; i2++; i3++; 822bbb16584SMilan Broz 823bbb16584SMilan Broz if (i2 >= n) 824bbb16584SMilan Broz i2 -= n; 825bbb16584SMilan Broz 826bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 827bbb16584SMilan Broz i1++; i2++; i3++; 828bbb16584SMilan Broz 829bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 830bbb16584SMilan Broz i1++; i2++; i3++; 831bbb16584SMilan Broz } 832bbb16584SMilan Broz } 833bbb16584SMilan Broz } 834bbb16584SMilan Broz 835bbb16584SMilan Broz static void diffuser_a_encrypt(u32 *d, size_t n) 836bbb16584SMilan Broz { 837bbb16584SMilan Broz int i, i1, i2, i3; 838bbb16584SMilan Broz 839bbb16584SMilan Broz for (i = 0; i < 5; i++) { 840bbb16584SMilan Broz i1 = n - 1; 841bbb16584SMilan Broz i2 = n - 2 - 1; 842bbb16584SMilan Broz i3 = n - 5 - 1; 843bbb16584SMilan Broz 844bbb16584SMilan Broz while (i1 > 0) { 845bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 846bbb16584SMilan Broz i1--; i2--; i3--; 847bbb16584SMilan Broz 848bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 13 | d[i3] >> 19); 849bbb16584SMilan Broz i1--; i2--; i3--; 850bbb16584SMilan Broz 851bbb16584SMilan Broz if (i2 < 0) 852bbb16584SMilan Broz i2 += n; 853bbb16584SMilan Broz 854bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 855bbb16584SMilan Broz i1--; i2--; i3--; 856bbb16584SMilan Broz 857bbb16584SMilan Broz if (i3 < 0) 858bbb16584SMilan Broz i3 += n; 859bbb16584SMilan Broz 860bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 9 | d[i3] >> 23); 861bbb16584SMilan Broz i1--; i2--; i3--; 862bbb16584SMilan Broz } 863bbb16584SMilan Broz } 864bbb16584SMilan Broz } 865bbb16584SMilan Broz 866bbb16584SMilan Broz static void diffuser_b_decrypt(u32 *d, size_t n) 867bbb16584SMilan Broz { 868bbb16584SMilan Broz int i, i1, i2, i3; 869bbb16584SMilan Broz 870bbb16584SMilan Broz for (i = 0; i < 3; i++) { 871bbb16584SMilan Broz i1 = 0; 872bbb16584SMilan Broz i2 = 2; 873bbb16584SMilan Broz i3 = 5; 874bbb16584SMilan Broz 875bbb16584SMilan Broz while (i1 < (n - 1)) { 876bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 877bbb16584SMilan Broz i1++; i2++; i3++; 878bbb16584SMilan Broz 879bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 880bbb16584SMilan Broz i1++; i2++; i3++; 881bbb16584SMilan Broz 882bbb16584SMilan Broz if (i2 >= n) 883bbb16584SMilan Broz i2 -= n; 884bbb16584SMilan Broz 885bbb16584SMilan Broz d[i1] += d[i2] ^ d[i3]; 886bbb16584SMilan Broz i1++; i2++; i3++; 887bbb16584SMilan Broz 888bbb16584SMilan Broz if (i3 >= n) 889bbb16584SMilan Broz i3 -= n; 890bbb16584SMilan Broz 891bbb16584SMilan Broz d[i1] += d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 892bbb16584SMilan Broz i1++; i2++; i3++; 893bbb16584SMilan Broz } 894bbb16584SMilan Broz } 895bbb16584SMilan Broz } 896bbb16584SMilan Broz 897bbb16584SMilan Broz static void diffuser_b_encrypt(u32 *d, size_t n) 898bbb16584SMilan Broz { 899bbb16584SMilan Broz int i, i1, i2, i3; 900bbb16584SMilan Broz 901bbb16584SMilan Broz for (i = 0; i < 3; i++) { 902bbb16584SMilan Broz i1 = n - 1; 903bbb16584SMilan Broz i2 = 2 - 1; 904bbb16584SMilan Broz i3 = 5 - 1; 905bbb16584SMilan Broz 906bbb16584SMilan Broz while (i1 > 0) { 907bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 25 | d[i3] >> 7); 908bbb16584SMilan Broz i1--; i2--; i3--; 909bbb16584SMilan Broz 910bbb16584SMilan Broz if (i3 < 0) 911bbb16584SMilan Broz i3 += n; 912bbb16584SMilan Broz 913bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 914bbb16584SMilan Broz i1--; i2--; i3--; 915bbb16584SMilan Broz 916bbb16584SMilan Broz if (i2 < 0) 917bbb16584SMilan Broz i2 += n; 918bbb16584SMilan Broz 919bbb16584SMilan Broz d[i1] -= d[i2] ^ (d[i3] << 10 | d[i3] >> 22); 920bbb16584SMilan Broz i1--; i2--; i3--; 921bbb16584SMilan Broz 922bbb16584SMilan Broz d[i1] -= d[i2] ^ d[i3]; 923bbb16584SMilan Broz i1--; i2--; i3--; 924bbb16584SMilan Broz } 925bbb16584SMilan Broz } 926bbb16584SMilan Broz } 927bbb16584SMilan Broz 928bbb16584SMilan Broz static int crypt_iv_elephant(struct crypt_config *cc, struct dm_crypt_request *dmreq) 929bbb16584SMilan Broz { 930bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 931bbb16584SMilan Broz u8 *es, *ks, *data, *data2, *data_offset; 932bbb16584SMilan Broz struct skcipher_request *req; 933bbb16584SMilan Broz struct scatterlist *sg, *sg2, src, dst; 934bbb16584SMilan Broz struct crypto_wait wait; 935bbb16584SMilan Broz int i, r; 936bbb16584SMilan Broz 937bbb16584SMilan Broz req = skcipher_request_alloc(elephant->tfm, GFP_NOIO); 938bbb16584SMilan Broz es = kzalloc(16, GFP_NOIO); /* Key for AES */ 939bbb16584SMilan Broz ks = kzalloc(32, GFP_NOIO); /* Elephant sector key */ 940bbb16584SMilan Broz 941bbb16584SMilan Broz if (!req || !es || !ks) { 942bbb16584SMilan Broz r = -ENOMEM; 943bbb16584SMilan Broz goto out; 944bbb16584SMilan Broz } 945bbb16584SMilan Broz 946bbb16584SMilan Broz *(__le64 *)es = cpu_to_le64(dmreq->iv_sector * cc->sector_size); 947bbb16584SMilan Broz 948bbb16584SMilan Broz /* E(Ks, e(s)) */ 949bbb16584SMilan Broz sg_init_one(&src, es, 16); 950bbb16584SMilan Broz sg_init_one(&dst, ks, 16); 951bbb16584SMilan Broz skcipher_request_set_crypt(req, &src, &dst, 16, NULL); 952bbb16584SMilan Broz skcipher_request_set_callback(req, 0, crypto_req_done, &wait); 953bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 954bbb16584SMilan Broz if (r) 955bbb16584SMilan Broz goto out; 956bbb16584SMilan Broz 957bbb16584SMilan Broz /* E(Ks, e'(s)) */ 958bbb16584SMilan Broz es[15] = 0x80; 959bbb16584SMilan Broz sg_init_one(&dst, &ks[16], 16); 960bbb16584SMilan Broz r = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); 961bbb16584SMilan Broz if (r) 962bbb16584SMilan Broz goto out; 963bbb16584SMilan Broz 964bbb16584SMilan Broz sg = crypt_get_sg_data(cc, dmreq->sg_out); 965bbb16584SMilan Broz data = kmap_atomic(sg_page(sg)); 966bbb16584SMilan Broz data_offset = data + sg->offset; 967bbb16584SMilan Broz 968bbb16584SMilan Broz /* Cannot modify original bio, copy to sg_out and apply Elephant to it */ 969bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 970bbb16584SMilan Broz sg2 = crypt_get_sg_data(cc, dmreq->sg_in); 971bbb16584SMilan Broz data2 = kmap_atomic(sg_page(sg2)); 972bbb16584SMilan Broz memcpy(data_offset, data2 + sg2->offset, cc->sector_size); 973bbb16584SMilan Broz kunmap_atomic(data2); 974bbb16584SMilan Broz } 975bbb16584SMilan Broz 976bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { 977bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 978bbb16584SMilan Broz diffuser_b_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 979bbb16584SMilan Broz diffuser_a_decrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 980bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 981bbb16584SMilan Broz } 982bbb16584SMilan Broz 983bbb16584SMilan Broz for (i = 0; i < (cc->sector_size / 32); i++) 984bbb16584SMilan Broz crypto_xor(data_offset + i * 32, ks, 32); 985bbb16584SMilan Broz 986bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 987bbb16584SMilan Broz diffuser_disk_to_cpu((u32*)data_offset, cc->sector_size / sizeof(u32)); 988bbb16584SMilan Broz diffuser_a_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 989bbb16584SMilan Broz diffuser_b_encrypt((u32*)data_offset, cc->sector_size / sizeof(u32)); 990bbb16584SMilan Broz diffuser_cpu_to_disk((__le32*)data_offset, cc->sector_size / sizeof(u32)); 991bbb16584SMilan Broz } 992bbb16584SMilan Broz 993bbb16584SMilan Broz kunmap_atomic(data); 994bbb16584SMilan Broz out: 995bbb16584SMilan Broz kzfree(ks); 996bbb16584SMilan Broz kzfree(es); 997bbb16584SMilan Broz skcipher_request_free(req); 998bbb16584SMilan Broz return r; 999bbb16584SMilan Broz } 1000bbb16584SMilan Broz 1001bbb16584SMilan Broz static int crypt_iv_elephant_gen(struct crypt_config *cc, u8 *iv, 1002bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1003bbb16584SMilan Broz { 1004bbb16584SMilan Broz int r; 1005bbb16584SMilan Broz 1006bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { 1007bbb16584SMilan Broz r = crypt_iv_elephant(cc, dmreq); 1008bbb16584SMilan Broz if (r) 1009bbb16584SMilan Broz return r; 1010bbb16584SMilan Broz } 1011bbb16584SMilan Broz 1012bbb16584SMilan Broz return crypt_iv_eboiv_gen(cc, iv, dmreq); 1013bbb16584SMilan Broz } 1014bbb16584SMilan Broz 1015bbb16584SMilan Broz static int crypt_iv_elephant_post(struct crypt_config *cc, u8 *iv, 1016bbb16584SMilan Broz struct dm_crypt_request *dmreq) 1017bbb16584SMilan Broz { 1018bbb16584SMilan Broz if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) 1019bbb16584SMilan Broz return crypt_iv_elephant(cc, dmreq); 1020bbb16584SMilan Broz 1021bbb16584SMilan Broz return 0; 1022bbb16584SMilan Broz } 1023bbb16584SMilan Broz 1024bbb16584SMilan Broz static int crypt_iv_elephant_init(struct crypt_config *cc) 1025bbb16584SMilan Broz { 1026bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1027bbb16584SMilan Broz int key_offset = cc->key_size - cc->key_extra_size; 1028bbb16584SMilan Broz 1029bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, &cc->key[key_offset], cc->key_extra_size); 1030bbb16584SMilan Broz } 1031bbb16584SMilan Broz 1032bbb16584SMilan Broz static int crypt_iv_elephant_wipe(struct crypt_config *cc) 1033bbb16584SMilan Broz { 1034bbb16584SMilan Broz struct iv_elephant_private *elephant = &cc->iv_gen_private.elephant; 1035bbb16584SMilan Broz u8 key[ELEPHANT_MAX_KEY_SIZE]; 1036bbb16584SMilan Broz 1037bbb16584SMilan Broz memset(key, 0, cc->key_extra_size); 1038bbb16584SMilan Broz return crypto_skcipher_setkey(elephant->tfm, key, cc->key_extra_size); 1039bbb16584SMilan Broz } 1040bbb16584SMilan Broz 10411b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain_ops = { 10421da177e4SLinus Torvalds .generator = crypt_iv_plain_gen 10431da177e4SLinus Torvalds }; 10441da177e4SLinus Torvalds 10451b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_plain64_ops = { 104661afef61SMilan Broz .generator = crypt_iv_plain64_gen 104761afef61SMilan Broz }; 104861afef61SMilan Broz 10497e3fd855SMilan Broz static const struct crypt_iv_operations crypt_iv_plain64be_ops = { 10507e3fd855SMilan Broz .generator = crypt_iv_plain64be_gen 10517e3fd855SMilan Broz }; 10527e3fd855SMilan Broz 10531b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_essiv_ops = { 10541da177e4SLinus Torvalds .generator = crypt_iv_essiv_gen 10551da177e4SLinus Torvalds }; 10561da177e4SLinus Torvalds 10571b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_benbi_ops = { 105848527fa7SRik Snel .ctr = crypt_iv_benbi_ctr, 105948527fa7SRik Snel .dtr = crypt_iv_benbi_dtr, 106048527fa7SRik Snel .generator = crypt_iv_benbi_gen 106148527fa7SRik Snel }; 10621da177e4SLinus Torvalds 10631b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_null_ops = { 106446b47730SLudwig Nussel .generator = crypt_iv_null_gen 106546b47730SLudwig Nussel }; 106646b47730SLudwig Nussel 10671b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_lmk_ops = { 106834745785SMilan Broz .ctr = crypt_iv_lmk_ctr, 106934745785SMilan Broz .dtr = crypt_iv_lmk_dtr, 107034745785SMilan Broz .init = crypt_iv_lmk_init, 107134745785SMilan Broz .wipe = crypt_iv_lmk_wipe, 107234745785SMilan Broz .generator = crypt_iv_lmk_gen, 107334745785SMilan Broz .post = crypt_iv_lmk_post 107434745785SMilan Broz }; 107534745785SMilan Broz 10761b1b58f5SJulia Lawall static const struct crypt_iv_operations crypt_iv_tcw_ops = { 1077ed04d981SMilan Broz .ctr = crypt_iv_tcw_ctr, 1078ed04d981SMilan Broz .dtr = crypt_iv_tcw_dtr, 1079ed04d981SMilan Broz .init = crypt_iv_tcw_init, 1080ed04d981SMilan Broz .wipe = crypt_iv_tcw_wipe, 1081ed04d981SMilan Broz .generator = crypt_iv_tcw_gen, 1082ed04d981SMilan Broz .post = crypt_iv_tcw_post 1083ed04d981SMilan Broz }; 1084ed04d981SMilan Broz 1085ef43aa38SMilan Broz static struct crypt_iv_operations crypt_iv_random_ops = { 1086ef43aa38SMilan Broz .generator = crypt_iv_random_gen 1087ef43aa38SMilan Broz }; 1088ef43aa38SMilan Broz 1089b9411d73SMilan Broz static struct crypt_iv_operations crypt_iv_eboiv_ops = { 1090b9411d73SMilan Broz .ctr = crypt_iv_eboiv_ctr, 1091b9411d73SMilan Broz .generator = crypt_iv_eboiv_gen 1092b9411d73SMilan Broz }; 1093b9411d73SMilan Broz 1094bbb16584SMilan Broz static struct crypt_iv_operations crypt_iv_elephant_ops = { 1095bbb16584SMilan Broz .ctr = crypt_iv_elephant_ctr, 1096bbb16584SMilan Broz .dtr = crypt_iv_elephant_dtr, 1097bbb16584SMilan Broz .init = crypt_iv_elephant_init, 1098bbb16584SMilan Broz .wipe = crypt_iv_elephant_wipe, 1099bbb16584SMilan Broz .generator = crypt_iv_elephant_gen, 1100bbb16584SMilan Broz .post = crypt_iv_elephant_post 1101bbb16584SMilan Broz }; 1102bbb16584SMilan Broz 1103ef43aa38SMilan Broz /* 1104ef43aa38SMilan Broz * Integrity extensions 1105ef43aa38SMilan Broz */ 1106ef43aa38SMilan Broz static bool crypt_integrity_aead(struct crypt_config *cc) 1107ef43aa38SMilan Broz { 1108ef43aa38SMilan Broz return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 1109ef43aa38SMilan Broz } 1110ef43aa38SMilan Broz 1111ef43aa38SMilan Broz static bool crypt_integrity_hmac(struct crypt_config *cc) 1112ef43aa38SMilan Broz { 111333d2f09fSMilan Broz return crypt_integrity_aead(cc) && cc->key_mac_size; 1114ef43aa38SMilan Broz } 1115ef43aa38SMilan Broz 1116ef43aa38SMilan Broz /* Get sg containing data */ 1117ef43aa38SMilan Broz static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, 1118ef43aa38SMilan Broz struct scatterlist *sg) 1119ef43aa38SMilan Broz { 112033d2f09fSMilan Broz if (unlikely(crypt_integrity_aead(cc))) 1121ef43aa38SMilan Broz return &sg[2]; 1122ef43aa38SMilan Broz 1123ef43aa38SMilan Broz return sg; 1124ef43aa38SMilan Broz } 1125ef43aa38SMilan Broz 1126ef43aa38SMilan Broz static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) 1127ef43aa38SMilan Broz { 1128ef43aa38SMilan Broz struct bio_integrity_payload *bip; 1129ef43aa38SMilan Broz unsigned int tag_len; 1130ef43aa38SMilan Broz int ret; 1131ef43aa38SMilan Broz 1132ef43aa38SMilan Broz if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) 1133ef43aa38SMilan Broz return 0; 1134ef43aa38SMilan Broz 1135ef43aa38SMilan Broz bip = bio_integrity_alloc(bio, GFP_NOIO, 1); 1136ef43aa38SMilan Broz if (IS_ERR(bip)) 1137ef43aa38SMilan Broz return PTR_ERR(bip); 1138ef43aa38SMilan Broz 1139ff0c129dSMikulas Patocka tag_len = io->cc->on_disk_tag_size * (bio_sectors(bio) >> io->cc->sector_shift); 1140ef43aa38SMilan Broz 1141ef43aa38SMilan Broz bip->bip_iter.bi_size = tag_len; 1142ef43aa38SMilan Broz bip->bip_iter.bi_sector = io->cc->start + io->sector; 1143ef43aa38SMilan Broz 1144ef43aa38SMilan Broz ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), 1145ef43aa38SMilan Broz tag_len, offset_in_page(io->integrity_metadata)); 1146ef43aa38SMilan Broz if (unlikely(ret != tag_len)) 1147ef43aa38SMilan Broz return -ENOMEM; 1148ef43aa38SMilan Broz 1149ef43aa38SMilan Broz return 0; 1150ef43aa38SMilan Broz } 1151ef43aa38SMilan Broz 1152ef43aa38SMilan Broz static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) 1153ef43aa38SMilan Broz { 1154ef43aa38SMilan Broz #ifdef CONFIG_BLK_DEV_INTEGRITY 1155ef43aa38SMilan Broz struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); 11567a1cd723SMilan Broz struct mapped_device *md = dm_table_get_md(ti->table); 1157ef43aa38SMilan Broz 1158ef43aa38SMilan Broz /* From now we require underlying device with our integrity profile */ 1159ef43aa38SMilan Broz if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { 1160ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1161ef43aa38SMilan Broz return -EINVAL; 1162ef43aa38SMilan Broz } 1163ef43aa38SMilan Broz 1164583fe747SMikulas Patocka if (bi->tag_size != cc->on_disk_tag_size || 1165583fe747SMikulas Patocka bi->tuple_size != cc->on_disk_tag_size) { 1166ef43aa38SMilan Broz ti->error = "Integrity profile tag size mismatch."; 1167ef43aa38SMilan Broz return -EINVAL; 1168ef43aa38SMilan Broz } 1169583fe747SMikulas Patocka if (1 << bi->interval_exp != cc->sector_size) { 1170583fe747SMikulas Patocka ti->error = "Integrity profile sector size mismatch."; 1171583fe747SMikulas Patocka return -EINVAL; 1172583fe747SMikulas Patocka } 1173ef43aa38SMilan Broz 117433d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 1175ef43aa38SMilan Broz cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; 11767a1cd723SMilan Broz DMDEBUG("%s: Integrity AEAD, tag size %u, IV size %u.", dm_device_name(md), 1177ef43aa38SMilan Broz cc->integrity_tag_size, cc->integrity_iv_size); 1178ef43aa38SMilan Broz 1179ef43aa38SMilan Broz if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { 1180ef43aa38SMilan Broz ti->error = "Integrity AEAD auth tag size is not supported."; 1181ef43aa38SMilan Broz return -EINVAL; 1182ef43aa38SMilan Broz } 1183ef43aa38SMilan Broz } else if (cc->integrity_iv_size) 11847a1cd723SMilan Broz DMDEBUG("%s: Additional per-sector space %u bytes for IV.", dm_device_name(md), 1185ef43aa38SMilan Broz cc->integrity_iv_size); 1186ef43aa38SMilan Broz 1187ef43aa38SMilan Broz if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { 1188ef43aa38SMilan Broz ti->error = "Not enough space for integrity tag in the profile."; 1189ef43aa38SMilan Broz return -EINVAL; 1190ef43aa38SMilan Broz } 1191ef43aa38SMilan Broz 1192ef43aa38SMilan Broz return 0; 1193ef43aa38SMilan Broz #else 1194ef43aa38SMilan Broz ti->error = "Integrity profile not supported."; 1195ef43aa38SMilan Broz return -EINVAL; 1196ef43aa38SMilan Broz #endif 1197ef43aa38SMilan Broz } 1198ef43aa38SMilan Broz 1199d469f841SMilan Broz static void crypt_convert_init(struct crypt_config *cc, 1200d469f841SMilan Broz struct convert_context *ctx, 12011da177e4SLinus Torvalds struct bio *bio_out, struct bio *bio_in, 1202fcd369daSMilan Broz sector_t sector) 12031da177e4SLinus Torvalds { 12041da177e4SLinus Torvalds ctx->bio_in = bio_in; 12051da177e4SLinus Torvalds ctx->bio_out = bio_out; 1206003b5c57SKent Overstreet if (bio_in) 1207003b5c57SKent Overstreet ctx->iter_in = bio_in->bi_iter; 1208003b5c57SKent Overstreet if (bio_out) 1209003b5c57SKent Overstreet ctx->iter_out = bio_out->bi_iter; 1210c66029f4SMikulas Patocka ctx->cc_sector = sector + cc->iv_offset; 121143d69034SMilan Broz init_completion(&ctx->restart); 12121da177e4SLinus Torvalds } 12131da177e4SLinus Torvalds 1214b2174eebSHuang Ying static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, 1215ef43aa38SMilan Broz void *req) 1216b2174eebSHuang Ying { 1217b2174eebSHuang Ying return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); 1218b2174eebSHuang Ying } 1219b2174eebSHuang Ying 1220ef43aa38SMilan Broz static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) 1221b2174eebSHuang Ying { 1222ef43aa38SMilan Broz return (void *)((char *)dmreq - cc->dmreq_start); 1223b2174eebSHuang Ying } 1224b2174eebSHuang Ying 12252dc5327dSMilan Broz static u8 *iv_of_dmreq(struct crypt_config *cc, 12262dc5327dSMilan Broz struct dm_crypt_request *dmreq) 12272dc5327dSMilan Broz { 122833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1229ef43aa38SMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1230ef43aa38SMilan Broz crypto_aead_alignmask(any_tfm_aead(cc)) + 1); 1231ef43aa38SMilan Broz else 12322dc5327dSMilan Broz return (u8 *)ALIGN((unsigned long)(dmreq + 1), 1233bbdb23b5SHerbert Xu crypto_skcipher_alignmask(any_tfm(cc)) + 1); 12342dc5327dSMilan Broz } 12352dc5327dSMilan Broz 1236ef43aa38SMilan Broz static u8 *org_iv_of_dmreq(struct crypt_config *cc, 1237ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1238ef43aa38SMilan Broz { 1239ef43aa38SMilan Broz return iv_of_dmreq(cc, dmreq) + cc->iv_size; 1240ef43aa38SMilan Broz } 1241ef43aa38SMilan Broz 1242c13b5487SChristoph Hellwig static __le64 *org_sector_of_dmreq(struct crypt_config *cc, 1243ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1244ef43aa38SMilan Broz { 1245ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; 1246c13b5487SChristoph Hellwig return (__le64 *) ptr; 1247ef43aa38SMilan Broz } 1248ef43aa38SMilan Broz 1249ef43aa38SMilan Broz static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, 1250ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1251ef43aa38SMilan Broz { 1252ef43aa38SMilan Broz u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + 1253ef43aa38SMilan Broz cc->iv_size + sizeof(uint64_t); 1254ef43aa38SMilan Broz return (unsigned int*)ptr; 1255ef43aa38SMilan Broz } 1256ef43aa38SMilan Broz 1257ef43aa38SMilan Broz static void *tag_from_dmreq(struct crypt_config *cc, 1258ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1259ef43aa38SMilan Broz { 1260ef43aa38SMilan Broz struct convert_context *ctx = dmreq->ctx; 1261ef43aa38SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 1262ef43aa38SMilan Broz 1263ef43aa38SMilan Broz return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * 1264ef43aa38SMilan Broz cc->on_disk_tag_size]; 1265ef43aa38SMilan Broz } 1266ef43aa38SMilan Broz 1267ef43aa38SMilan Broz static void *iv_tag_from_dmreq(struct crypt_config *cc, 1268ef43aa38SMilan Broz struct dm_crypt_request *dmreq) 1269ef43aa38SMilan Broz { 1270ef43aa38SMilan Broz return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; 1271ef43aa38SMilan Broz } 1272ef43aa38SMilan Broz 1273ef43aa38SMilan Broz static int crypt_convert_block_aead(struct crypt_config *cc, 12743a7f6c99SMilan Broz struct convert_context *ctx, 1275ef43aa38SMilan Broz struct aead_request *req, 1276ef43aa38SMilan Broz unsigned int tag_offset) 127701482b76SMilan Broz { 1278003b5c57SKent Overstreet struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1279003b5c57SKent Overstreet struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 12803a7f6c99SMilan Broz struct dm_crypt_request *dmreq; 1281ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv, *tag; 1282c13b5487SChristoph Hellwig __le64 *sector; 1283ef43aa38SMilan Broz int r = 0; 1284ef43aa38SMilan Broz 1285ef43aa38SMilan Broz BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); 128601482b76SMilan Broz 12878f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 12880440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 12898f0009a2SMilan Broz return -EIO; 129001482b76SMilan Broz 1291b2174eebSHuang Ying dmreq = dmreq_of_req(cc, req); 1292c66029f4SMikulas Patocka dmreq->iv_sector = ctx->cc_sector; 12938f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1294ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1295b2174eebSHuang Ying dmreq->ctx = ctx; 129601482b76SMilan Broz 1297ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 129801482b76SMilan Broz 1299ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1300ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1301ef43aa38SMilan Broz 1302ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1303ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1304ef43aa38SMilan Broz tag = tag_from_dmreq(cc, dmreq); 1305ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1306ef43aa38SMilan Broz 1307ef43aa38SMilan Broz /* AEAD request: 1308ef43aa38SMilan Broz * |----- AAD -------|------ DATA -------|-- AUTH TAG --| 1309ef43aa38SMilan Broz * | (authenticated) | (auth+encryption) | | 1310ef43aa38SMilan Broz * | sector_LE | IV | sector in/out | tag in/out | 1311ef43aa38SMilan Broz */ 1312ef43aa38SMilan Broz sg_init_table(dmreq->sg_in, 4); 1313ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); 1314ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); 13158f0009a2SMilan Broz sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1316ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); 1317ef43aa38SMilan Broz 1318ef43aa38SMilan Broz sg_init_table(dmreq->sg_out, 4); 1319ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); 1320ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); 13218f0009a2SMilan Broz sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1322ef43aa38SMilan Broz sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); 132301482b76SMilan Broz 13243a7f6c99SMilan Broz if (cc->iv_gen_ops) { 1325ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1326ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1327ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->iv_size); 1328ef43aa38SMilan Broz } else { 1329ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 13303a7f6c99SMilan Broz if (r < 0) 13313a7f6c99SMilan Broz return r; 1332ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1333ef43aa38SMilan Broz if (cc->integrity_iv_size) 1334ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->iv_size); 1335ef43aa38SMilan Broz } 1336ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1337ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1338ef43aa38SMilan Broz } 1339ef43aa38SMilan Broz 1340ef43aa38SMilan Broz aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); 1341ef43aa38SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) { 1342ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13438f0009a2SMilan Broz cc->sector_size, iv); 1344ef43aa38SMilan Broz r = crypto_aead_encrypt(req); 1345ef43aa38SMilan Broz if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) 1346ef43aa38SMilan Broz memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, 1347ef43aa38SMilan Broz cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); 1348ef43aa38SMilan Broz } else { 1349ef43aa38SMilan Broz aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, 13508f0009a2SMilan Broz cc->sector_size + cc->integrity_tag_size, iv); 1351ef43aa38SMilan Broz r = crypto_aead_decrypt(req); 1352ef43aa38SMilan Broz } 1353ef43aa38SMilan Broz 1354f710126cSMilan Broz if (r == -EBADMSG) { 1355f710126cSMilan Broz char b[BDEVNAME_SIZE]; 1356f710126cSMilan Broz DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), 1357ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*sector)); 1358f710126cSMilan Broz } 1359ef43aa38SMilan Broz 1360ef43aa38SMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1361ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1362ef43aa38SMilan Broz 13638f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 13648f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 1365ef43aa38SMilan Broz 1366ef43aa38SMilan Broz return r; 13673a7f6c99SMilan Broz } 13683a7f6c99SMilan Broz 1369ef43aa38SMilan Broz static int crypt_convert_block_skcipher(struct crypt_config *cc, 1370ef43aa38SMilan Broz struct convert_context *ctx, 1371ef43aa38SMilan Broz struct skcipher_request *req, 1372ef43aa38SMilan Broz unsigned int tag_offset) 1373ef43aa38SMilan Broz { 1374ef43aa38SMilan Broz struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); 1375ef43aa38SMilan Broz struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); 1376ef43aa38SMilan Broz struct scatterlist *sg_in, *sg_out; 1377ef43aa38SMilan Broz struct dm_crypt_request *dmreq; 1378ef43aa38SMilan Broz u8 *iv, *org_iv, *tag_iv; 1379c13b5487SChristoph Hellwig __le64 *sector; 1380ef43aa38SMilan Broz int r = 0; 1381ef43aa38SMilan Broz 13828f0009a2SMilan Broz /* Reject unexpected unaligned bio. */ 13830440d5c0SMikulas Patocka if (unlikely(bv_in.bv_len & (cc->sector_size - 1))) 13848f0009a2SMilan Broz return -EIO; 13858f0009a2SMilan Broz 1386ef43aa38SMilan Broz dmreq = dmreq_of_req(cc, req); 1387ef43aa38SMilan Broz dmreq->iv_sector = ctx->cc_sector; 13888f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 1389ff3af92bSMikulas Patocka dmreq->iv_sector >>= cc->sector_shift; 1390ef43aa38SMilan Broz dmreq->ctx = ctx; 1391ef43aa38SMilan Broz 1392ef43aa38SMilan Broz *org_tag_of_dmreq(cc, dmreq) = tag_offset; 1393ef43aa38SMilan Broz 1394ef43aa38SMilan Broz iv = iv_of_dmreq(cc, dmreq); 1395ef43aa38SMilan Broz org_iv = org_iv_of_dmreq(cc, dmreq); 1396ef43aa38SMilan Broz tag_iv = iv_tag_from_dmreq(cc, dmreq); 1397ef43aa38SMilan Broz 1398ef43aa38SMilan Broz sector = org_sector_of_dmreq(cc, dmreq); 1399ef43aa38SMilan Broz *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); 1400ef43aa38SMilan Broz 1401ef43aa38SMilan Broz /* For skcipher we use only the first sg item */ 1402ef43aa38SMilan Broz sg_in = &dmreq->sg_in[0]; 1403ef43aa38SMilan Broz sg_out = &dmreq->sg_out[0]; 1404ef43aa38SMilan Broz 1405ef43aa38SMilan Broz sg_init_table(sg_in, 1); 14068f0009a2SMilan Broz sg_set_page(sg_in, bv_in.bv_page, cc->sector_size, bv_in.bv_offset); 1407ef43aa38SMilan Broz 1408ef43aa38SMilan Broz sg_init_table(sg_out, 1); 14098f0009a2SMilan Broz sg_set_page(sg_out, bv_out.bv_page, cc->sector_size, bv_out.bv_offset); 1410ef43aa38SMilan Broz 1411ef43aa38SMilan Broz if (cc->iv_gen_ops) { 1412ef43aa38SMilan Broz /* For READs use IV stored in integrity metadata */ 1413ef43aa38SMilan Broz if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { 1414ef43aa38SMilan Broz memcpy(org_iv, tag_iv, cc->integrity_iv_size); 1415ef43aa38SMilan Broz } else { 1416ef43aa38SMilan Broz r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); 1417ef43aa38SMilan Broz if (r < 0) 1418ef43aa38SMilan Broz return r; 1419bbb16584SMilan Broz /* Data can be already preprocessed in generator */ 1420bbb16584SMilan Broz if (test_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags)) 1421bbb16584SMilan Broz sg_in = sg_out; 1422ef43aa38SMilan Broz /* Store generated IV in integrity metadata */ 1423ef43aa38SMilan Broz if (cc->integrity_iv_size) 1424ef43aa38SMilan Broz memcpy(tag_iv, org_iv, cc->integrity_iv_size); 1425ef43aa38SMilan Broz } 1426ef43aa38SMilan Broz /* Working copy of IV, to be modified in crypto API */ 1427ef43aa38SMilan Broz memcpy(iv, org_iv, cc->iv_size); 1428ef43aa38SMilan Broz } 1429ef43aa38SMilan Broz 14308f0009a2SMilan Broz skcipher_request_set_crypt(req, sg_in, sg_out, cc->sector_size, iv); 14313a7f6c99SMilan Broz 14323a7f6c99SMilan Broz if (bio_data_dir(ctx->bio_in) == WRITE) 1433bbdb23b5SHerbert Xu r = crypto_skcipher_encrypt(req); 14343a7f6c99SMilan Broz else 1435bbdb23b5SHerbert Xu r = crypto_skcipher_decrypt(req); 14363a7f6c99SMilan Broz 14372dc5327dSMilan Broz if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) 1438ef43aa38SMilan Broz r = cc->iv_gen_ops->post(cc, org_iv, dmreq); 1439ef43aa38SMilan Broz 14408f0009a2SMilan Broz bio_advance_iter(ctx->bio_in, &ctx->iter_in, cc->sector_size); 14418f0009a2SMilan Broz bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size); 14422dc5327dSMilan Broz 14433a7f6c99SMilan Broz return r; 144401482b76SMilan Broz } 144501482b76SMilan Broz 144695497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 144795497a96SMilan Broz int error); 1448c0297721SAndi Kleen 1449ef43aa38SMilan Broz static void crypt_alloc_req_skcipher(struct crypt_config *cc, 1450ddd42edfSMilan Broz struct convert_context *ctx) 1451ddd42edfSMilan Broz { 1452c66029f4SMikulas Patocka unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); 1453c0297721SAndi Kleen 1454ef43aa38SMilan Broz if (!ctx->r.req) 14556f1c819cSKent Overstreet ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO); 1456c0297721SAndi Kleen 1457ef43aa38SMilan Broz skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); 145854cea3f6SMilan Broz 145954cea3f6SMilan Broz /* 146054cea3f6SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 146154cea3f6SMilan Broz * requests if driver request queue is full. 146254cea3f6SMilan Broz */ 1463ef43aa38SMilan Broz skcipher_request_set_callback(ctx->r.req, 1464432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1465ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); 1466ddd42edfSMilan Broz } 1467ddd42edfSMilan Broz 1468ef43aa38SMilan Broz static void crypt_alloc_req_aead(struct crypt_config *cc, 1469ef43aa38SMilan Broz struct convert_context *ctx) 1470ef43aa38SMilan Broz { 1471ef43aa38SMilan Broz if (!ctx->r.req_aead) 14726f1c819cSKent Overstreet ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO); 1473ef43aa38SMilan Broz 1474ef43aa38SMilan Broz aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); 1475ef43aa38SMilan Broz 1476ef43aa38SMilan Broz /* 1477ef43aa38SMilan Broz * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs 1478ef43aa38SMilan Broz * requests if driver request queue is full. 1479ef43aa38SMilan Broz */ 1480ef43aa38SMilan Broz aead_request_set_callback(ctx->r.req_aead, 1481432061b3SMikulas Patocka CRYPTO_TFM_REQ_MAY_BACKLOG, 1482ef43aa38SMilan Broz kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); 1483ef43aa38SMilan Broz } 1484ef43aa38SMilan Broz 1485ef43aa38SMilan Broz static void crypt_alloc_req(struct crypt_config *cc, 1486ef43aa38SMilan Broz struct convert_context *ctx) 1487ef43aa38SMilan Broz { 148833d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1489ef43aa38SMilan Broz crypt_alloc_req_aead(cc, ctx); 1490ef43aa38SMilan Broz else 1491ef43aa38SMilan Broz crypt_alloc_req_skcipher(cc, ctx); 1492ef43aa38SMilan Broz } 1493ef43aa38SMilan Broz 1494ef43aa38SMilan Broz static void crypt_free_req_skcipher(struct crypt_config *cc, 1495bbdb23b5SHerbert Xu struct skcipher_request *req, struct bio *base_bio) 1496298a9fa0SMikulas Patocka { 1497298a9fa0SMikulas Patocka struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1498298a9fa0SMikulas Patocka 1499bbdb23b5SHerbert Xu if ((struct skcipher_request *)(io + 1) != req) 15006f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1501298a9fa0SMikulas Patocka } 1502298a9fa0SMikulas Patocka 1503ef43aa38SMilan Broz static void crypt_free_req_aead(struct crypt_config *cc, 1504ef43aa38SMilan Broz struct aead_request *req, struct bio *base_bio) 1505ef43aa38SMilan Broz { 1506ef43aa38SMilan Broz struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); 1507ef43aa38SMilan Broz 1508ef43aa38SMilan Broz if ((struct aead_request *)(io + 1) != req) 15096f1c819cSKent Overstreet mempool_free(req, &cc->req_pool); 1510ef43aa38SMilan Broz } 1511ef43aa38SMilan Broz 1512ef43aa38SMilan Broz static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) 1513ef43aa38SMilan Broz { 151433d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1515ef43aa38SMilan Broz crypt_free_req_aead(cc, req, base_bio); 1516ef43aa38SMilan Broz else 1517ef43aa38SMilan Broz crypt_free_req_skcipher(cc, req, base_bio); 1518ef43aa38SMilan Broz } 1519ef43aa38SMilan Broz 15201da177e4SLinus Torvalds /* 15211da177e4SLinus Torvalds * Encrypt / decrypt data from one bio to another one (can be the same one) 15221da177e4SLinus Torvalds */ 15234e4cbee9SChristoph Hellwig static blk_status_t crypt_convert(struct crypt_config *cc, 15241da177e4SLinus Torvalds struct convert_context *ctx) 15251da177e4SLinus Torvalds { 1526ef43aa38SMilan Broz unsigned int tag_offset = 0; 1527ff3af92bSMikulas Patocka unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT; 15283f1e9070SMilan Broz int r; 15291da177e4SLinus Torvalds 153040b6229bSMikulas Patocka atomic_set(&ctx->cc_pending, 1); 1531c8081618SMilan Broz 1532003b5c57SKent Overstreet while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { 15331da177e4SLinus Torvalds 15343a7f6c99SMilan Broz crypt_alloc_req(cc, ctx); 153540b6229bSMikulas Patocka atomic_inc(&ctx->cc_pending); 15363f1e9070SMilan Broz 153733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 1538ef43aa38SMilan Broz r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); 1539ef43aa38SMilan Broz else 1540ef43aa38SMilan Broz r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); 15413a7f6c99SMilan Broz 15423a7f6c99SMilan Broz switch (r) { 154354cea3f6SMilan Broz /* 154454cea3f6SMilan Broz * The request was queued by a crypto driver 154554cea3f6SMilan Broz * but the driver request queue is full, let's wait. 154654cea3f6SMilan Broz */ 15473a7f6c99SMilan Broz case -EBUSY: 15483a7f6c99SMilan Broz wait_for_completion(&ctx->restart); 154916735d02SWolfram Sang reinit_completion(&ctx->restart); 1550c0403ec0SRabin Vincent /* fall through */ 155154cea3f6SMilan Broz /* 155254cea3f6SMilan Broz * The request is queued and processed asynchronously, 155354cea3f6SMilan Broz * completion function kcryptd_async_done() will be called. 155454cea3f6SMilan Broz */ 1555c0403ec0SRabin Vincent case -EINPROGRESS: 1556ef43aa38SMilan Broz ctx->r.req = NULL; 15578f0009a2SMilan Broz ctx->cc_sector += sector_step; 1558583fe747SMikulas Patocka tag_offset++; 15593a7f6c99SMilan Broz continue; 156054cea3f6SMilan Broz /* 156154cea3f6SMilan Broz * The request was already processed (synchronously). 156254cea3f6SMilan Broz */ 15633f1e9070SMilan Broz case 0: 156440b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 15658f0009a2SMilan Broz ctx->cc_sector += sector_step; 1566583fe747SMikulas Patocka tag_offset++; 1567c7f1b204SMilan Broz cond_resched(); 15683f1e9070SMilan Broz continue; 1569ef43aa38SMilan Broz /* 1570ef43aa38SMilan Broz * There was a data integrity error. 1571ef43aa38SMilan Broz */ 1572ef43aa38SMilan Broz case -EBADMSG: 1573ef43aa38SMilan Broz atomic_dec(&ctx->cc_pending); 15744e4cbee9SChristoph Hellwig return BLK_STS_PROTECTION; 1575ef43aa38SMilan Broz /* 1576ef43aa38SMilan Broz * There was an error while processing the request. 1577ef43aa38SMilan Broz */ 15783f1e9070SMilan Broz default: 157940b6229bSMikulas Patocka atomic_dec(&ctx->cc_pending); 15804e4cbee9SChristoph Hellwig return BLK_STS_IOERR; 15811da177e4SLinus Torvalds } 15823f1e9070SMilan Broz } 15833f1e9070SMilan Broz 15843f1e9070SMilan Broz return 0; 15853f1e9070SMilan Broz } 15861da177e4SLinus Torvalds 1587cf2f1abfSMikulas Patocka static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); 1588cf2f1abfSMikulas Patocka 15891da177e4SLinus Torvalds /* 15901da177e4SLinus Torvalds * Generate a new unfragmented bio with the given size 1591586b286bSMike Snitzer * This should never violate the device limitations (but only because 1592586b286bSMike Snitzer * max_segment_size is being constrained to PAGE_SIZE). 15937145c241SMikulas Patocka * 15947145c241SMikulas Patocka * This function may be called concurrently. If we allocate from the mempool 15957145c241SMikulas Patocka * concurrently, there is a possibility of deadlock. For example, if we have 15967145c241SMikulas Patocka * mempool of 256 pages, two processes, each wanting 256, pages allocate from 15977145c241SMikulas Patocka * the mempool concurrently, it may deadlock in a situation where both processes 15987145c241SMikulas Patocka * have allocated 128 pages and the mempool is exhausted. 15997145c241SMikulas Patocka * 16007145c241SMikulas Patocka * In order to avoid this scenario we allocate the pages under a mutex. 16017145c241SMikulas Patocka * 16027145c241SMikulas Patocka * In order to not degrade performance with excessive locking, we try 16037145c241SMikulas Patocka * non-blocking allocations without a mutex first but on failure we fallback 16047145c241SMikulas Patocka * to blocking allocations with a mutex. 16051da177e4SLinus Torvalds */ 1606cf2f1abfSMikulas Patocka static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) 16071da177e4SLinus Torvalds { 160849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 16098b004457SMilan Broz struct bio *clone; 16101da177e4SLinus Torvalds unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 16117145c241SMikulas Patocka gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; 16127145c241SMikulas Patocka unsigned i, len, remaining_size; 161391e10625SMilan Broz struct page *page; 16141da177e4SLinus Torvalds 16157145c241SMikulas Patocka retry: 1616d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 16177145c241SMikulas Patocka mutex_lock(&cc->bio_alloc_lock); 16187145c241SMikulas Patocka 16196f1c819cSKent Overstreet clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, &cc->bs); 16208b004457SMilan Broz if (!clone) 1621ef43aa38SMilan Broz goto out; 16221da177e4SLinus Torvalds 1623027581f3SOlaf Kirch clone_init(io, clone); 16246a24c718SMilan Broz 16257145c241SMikulas Patocka remaining_size = size; 16267145c241SMikulas Patocka 1627f97380bcSOlaf Kirch for (i = 0; i < nr_iovecs; i++) { 16286f1c819cSKent Overstreet page = mempool_alloc(&cc->page_pool, gfp_mask); 16297145c241SMikulas Patocka if (!page) { 16307145c241SMikulas Patocka crypt_free_buffer_pages(cc, clone); 16317145c241SMikulas Patocka bio_put(clone); 1632d0164adcSMel Gorman gfp_mask |= __GFP_DIRECT_RECLAIM; 16337145c241SMikulas Patocka goto retry; 16347145c241SMikulas Patocka } 16351da177e4SLinus Torvalds 16367145c241SMikulas Patocka len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; 16371da177e4SLinus Torvalds 16380dae7fe5SMing Lei bio_add_page(clone, page, len, 0); 163991e10625SMilan Broz 16407145c241SMikulas Patocka remaining_size -= len; 16411da177e4SLinus Torvalds } 16421da177e4SLinus Torvalds 1643ef43aa38SMilan Broz /* Allocate space for integrity tags */ 1644ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1645ef43aa38SMilan Broz crypt_free_buffer_pages(cc, clone); 1646ef43aa38SMilan Broz bio_put(clone); 1647ef43aa38SMilan Broz clone = NULL; 1648ef43aa38SMilan Broz } 1649ef43aa38SMilan Broz out: 1650d0164adcSMel Gorman if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) 16517145c241SMikulas Patocka mutex_unlock(&cc->bio_alloc_lock); 16527145c241SMikulas Patocka 16538b004457SMilan Broz return clone; 16541da177e4SLinus Torvalds } 16551da177e4SLinus Torvalds 1656644bd2f0SNeil Brown static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) 16571da177e4SLinus Torvalds { 16581da177e4SLinus Torvalds struct bio_vec *bv; 16596dc4f100SMing Lei struct bvec_iter_all iter_all; 16601da177e4SLinus Torvalds 16612b070cfeSChristoph Hellwig bio_for_each_segment_all(bv, clone, iter_all) { 16621da177e4SLinus Torvalds BUG_ON(!bv->bv_page); 16636f1c819cSKent Overstreet mempool_free(bv->bv_page, &cc->page_pool); 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds } 16661da177e4SLinus Torvalds 1667298a9fa0SMikulas Patocka static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, 1668dc440d1eSMilan Broz struct bio *bio, sector_t sector) 1669dc440d1eSMilan Broz { 167049a8a920SAlasdair G Kergon io->cc = cc; 1671dc440d1eSMilan Broz io->base_bio = bio; 1672dc440d1eSMilan Broz io->sector = sector; 1673dc440d1eSMilan Broz io->error = 0; 1674ef43aa38SMilan Broz io->ctx.r.req = NULL; 1675ef43aa38SMilan Broz io->integrity_metadata = NULL; 1676ef43aa38SMilan Broz io->integrity_metadata_from_pool = false; 167740b6229bSMikulas Patocka atomic_set(&io->io_pending, 0); 1678dc440d1eSMilan Broz } 1679dc440d1eSMilan Broz 16803e1a8bddSMilan Broz static void crypt_inc_pending(struct dm_crypt_io *io) 16813e1a8bddSMilan Broz { 168240b6229bSMikulas Patocka atomic_inc(&io->io_pending); 16833e1a8bddSMilan Broz } 16843e1a8bddSMilan Broz 16851da177e4SLinus Torvalds /* 16861da177e4SLinus Torvalds * One of the bios was finished. Check for completion of 16871da177e4SLinus Torvalds * the whole request and correctly clean up the buffer. 16881da177e4SLinus Torvalds */ 16895742fd77SMilan Broz static void crypt_dec_pending(struct dm_crypt_io *io) 16901da177e4SLinus Torvalds { 169149a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1692b35f8caaSMilan Broz struct bio *base_bio = io->base_bio; 16934e4cbee9SChristoph Hellwig blk_status_t error = io->error; 16941da177e4SLinus Torvalds 169540b6229bSMikulas Patocka if (!atomic_dec_and_test(&io->io_pending)) 16961da177e4SLinus Torvalds return; 16971da177e4SLinus Torvalds 1698ef43aa38SMilan Broz if (io->ctx.r.req) 1699ef43aa38SMilan Broz crypt_free_req(cc, io->ctx.r.req, base_bio); 1700ef43aa38SMilan Broz 1701ef43aa38SMilan Broz if (unlikely(io->integrity_metadata_from_pool)) 17026f1c819cSKent Overstreet mempool_free(io->integrity_metadata, &io->cc->tag_pool); 1703ef43aa38SMilan Broz else 1704ef43aa38SMilan Broz kfree(io->integrity_metadata); 1705b35f8caaSMilan Broz 17064e4cbee9SChristoph Hellwig base_bio->bi_status = error; 17074246a0b6SChristoph Hellwig bio_endio(base_bio); 17081da177e4SLinus Torvalds } 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds /* 1711cabf08e4SMilan Broz * kcryptd/kcryptd_io: 17121da177e4SLinus Torvalds * 17131da177e4SLinus Torvalds * Needed because it would be very unwise to do decryption in an 171423541d2dSMilan Broz * interrupt context. 1715cabf08e4SMilan Broz * 1716cabf08e4SMilan Broz * kcryptd performs the actual encryption or decryption. 1717cabf08e4SMilan Broz * 1718cabf08e4SMilan Broz * kcryptd_io performs the IO submission. 1719cabf08e4SMilan Broz * 1720cabf08e4SMilan Broz * They must be separated as otherwise the final stages could be 1721cabf08e4SMilan Broz * starved by new requests which can block in the first stages due 1722cabf08e4SMilan Broz * to memory allocation. 1723c0297721SAndi Kleen * 1724c0297721SAndi Kleen * The work is done per CPU global for all dm-crypt instances. 1725c0297721SAndi Kleen * They should not depend on each other and do not block. 17261da177e4SLinus Torvalds */ 17274246a0b6SChristoph Hellwig static void crypt_endio(struct bio *clone) 17288b004457SMilan Broz { 1729028867acSAlasdair G Kergon struct dm_crypt_io *io = clone->bi_private; 173049a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1731ee7a491eSMilan Broz unsigned rw = bio_data_dir(clone); 17324e4cbee9SChristoph Hellwig blk_status_t error; 17338b004457SMilan Broz 17348b004457SMilan Broz /* 17356712ecf8SNeilBrown * free the processed pages 17368b004457SMilan Broz */ 1737ee7a491eSMilan Broz if (rw == WRITE) 1738644bd2f0SNeil Brown crypt_free_buffer_pages(cc, clone); 17398b004457SMilan Broz 17404e4cbee9SChristoph Hellwig error = clone->bi_status; 17418b004457SMilan Broz bio_put(clone); 1742ee7a491eSMilan Broz 17439b81c842SSasha Levin if (rw == READ && !error) { 1744cabf08e4SMilan Broz kcryptd_queue_crypt(io); 17456712ecf8SNeilBrown return; 1746ee7a491eSMilan Broz } 17475742fd77SMilan Broz 17489b81c842SSasha Levin if (unlikely(error)) 17499b81c842SSasha Levin io->error = error; 17505742fd77SMilan Broz 17515742fd77SMilan Broz crypt_dec_pending(io); 17528b004457SMilan Broz } 17538b004457SMilan Broz 1754028867acSAlasdair G Kergon static void clone_init(struct dm_crypt_io *io, struct bio *clone) 17558b004457SMilan Broz { 175649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 17578b004457SMilan Broz 17588b004457SMilan Broz clone->bi_private = io; 17598b004457SMilan Broz clone->bi_end_io = crypt_endio; 176074d46992SChristoph Hellwig bio_set_dev(clone, cc->dev->bdev); 1761ef295ecfSChristoph Hellwig clone->bi_opf = io->base_bio->bi_opf; 17628b004457SMilan Broz } 17638b004457SMilan Broz 176420c82538SMilan Broz static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) 17658b004457SMilan Broz { 176649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 17678b004457SMilan Broz struct bio *clone; 176893e605c2SMilan Broz 17698b004457SMilan Broz /* 177059779079SMike Snitzer * We need the original biovec array in order to decrypt 177159779079SMike Snitzer * the whole bio data *afterwards* -- thanks to immutable 177259779079SMike Snitzer * biovecs we don't need to worry about the block layer 177359779079SMike Snitzer * modifying the biovec array; so leverage bio_clone_fast(). 17748b004457SMilan Broz */ 17756f1c819cSKent Overstreet clone = bio_clone_fast(io->base_bio, gfp, &cc->bs); 17767eaceaccSJens Axboe if (!clone) 177720c82538SMilan Broz return 1; 17788b004457SMilan Broz 177920c82538SMilan Broz crypt_inc_pending(io); 178020c82538SMilan Broz 17818b004457SMilan Broz clone_init(io, clone); 17824f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 17838b004457SMilan Broz 1784ef43aa38SMilan Broz if (dm_crypt_integrity_io_alloc(io, clone)) { 1785ef43aa38SMilan Broz crypt_dec_pending(io); 1786ef43aa38SMilan Broz bio_put(clone); 1787ef43aa38SMilan Broz return 1; 1788ef43aa38SMilan Broz } 1789ef43aa38SMilan Broz 179093e605c2SMilan Broz generic_make_request(clone); 179120c82538SMilan Broz return 0; 17928b004457SMilan Broz } 17938b004457SMilan Broz 1794dc267621SMikulas Patocka static void kcryptd_io_read_work(struct work_struct *work) 1795395b167cSAlasdair G Kergon { 1796395b167cSAlasdair G Kergon struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 1797395b167cSAlasdair G Kergon 179820c82538SMilan Broz crypt_inc_pending(io); 179920c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOIO)) 18004e4cbee9SChristoph Hellwig io->error = BLK_STS_RESOURCE; 180120c82538SMilan Broz crypt_dec_pending(io); 1802395b167cSAlasdair G Kergon } 1803395b167cSAlasdair G Kergon 1804dc267621SMikulas Patocka static void kcryptd_queue_read(struct dm_crypt_io *io) 1805395b167cSAlasdair G Kergon { 180649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1807395b167cSAlasdair G Kergon 1808dc267621SMikulas Patocka INIT_WORK(&io->work, kcryptd_io_read_work); 1809395b167cSAlasdair G Kergon queue_work(cc->io_queue, &io->work); 1810395b167cSAlasdair G Kergon } 1811395b167cSAlasdair G Kergon 1812dc267621SMikulas Patocka static void kcryptd_io_write(struct dm_crypt_io *io) 1813dc267621SMikulas Patocka { 1814dc267621SMikulas Patocka struct bio *clone = io->ctx.bio_out; 1815dc267621SMikulas Patocka 1816dc267621SMikulas Patocka generic_make_request(clone); 1817dc267621SMikulas Patocka } 1818dc267621SMikulas Patocka 1819b3c5fd30SMikulas Patocka #define crypt_io_from_node(node) rb_entry((node), struct dm_crypt_io, rb_node) 1820b3c5fd30SMikulas Patocka 1821dc267621SMikulas Patocka static int dmcrypt_write(void *data) 1822dc267621SMikulas Patocka { 1823dc267621SMikulas Patocka struct crypt_config *cc = data; 1824b3c5fd30SMikulas Patocka struct dm_crypt_io *io; 1825b3c5fd30SMikulas Patocka 1826dc267621SMikulas Patocka while (1) { 1827b3c5fd30SMikulas Patocka struct rb_root write_tree; 1828dc267621SMikulas Patocka struct blk_plug plug; 1829dc267621SMikulas Patocka 1830c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1831dc267621SMikulas Patocka continue_locked: 1832dc267621SMikulas Patocka 1833b3c5fd30SMikulas Patocka if (!RB_EMPTY_ROOT(&cc->write_tree)) 1834dc267621SMikulas Patocka goto pop_from_list; 1835dc267621SMikulas Patocka 1836f659b100SRabin Vincent set_current_state(TASK_INTERRUPTIBLE); 1837dc267621SMikulas Patocka 1838c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1839dc267621SMikulas Patocka 1840f659b100SRabin Vincent if (unlikely(kthread_should_stop())) { 1841642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1842f659b100SRabin Vincent break; 1843f659b100SRabin Vincent } 1844f659b100SRabin Vincent 1845dc267621SMikulas Patocka schedule(); 1846dc267621SMikulas Patocka 1847642fa448SDavidlohr Bueso set_current_state(TASK_RUNNING); 1848c7329effSMikulas Patocka spin_lock_irq(&cc->write_thread_lock); 1849dc267621SMikulas Patocka goto continue_locked; 1850dc267621SMikulas Patocka 1851dc267621SMikulas Patocka pop_from_list: 1852b3c5fd30SMikulas Patocka write_tree = cc->write_tree; 1853b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 1854c7329effSMikulas Patocka spin_unlock_irq(&cc->write_thread_lock); 1855dc267621SMikulas Patocka 1856b3c5fd30SMikulas Patocka BUG_ON(rb_parent(write_tree.rb_node)); 1857b3c5fd30SMikulas Patocka 1858b3c5fd30SMikulas Patocka /* 1859b3c5fd30SMikulas Patocka * Note: we cannot walk the tree here with rb_next because 1860b3c5fd30SMikulas Patocka * the structures may be freed when kcryptd_io_write is called. 1861b3c5fd30SMikulas Patocka */ 1862dc267621SMikulas Patocka blk_start_plug(&plug); 1863dc267621SMikulas Patocka do { 1864b3c5fd30SMikulas Patocka io = crypt_io_from_node(rb_first(&write_tree)); 1865b3c5fd30SMikulas Patocka rb_erase(&io->rb_node, &write_tree); 1866dc267621SMikulas Patocka kcryptd_io_write(io); 1867b3c5fd30SMikulas Patocka } while (!RB_EMPTY_ROOT(&write_tree)); 1868dc267621SMikulas Patocka blk_finish_plug(&plug); 1869dc267621SMikulas Patocka } 1870dc267621SMikulas Patocka return 0; 1871dc267621SMikulas Patocka } 1872dc267621SMikulas Patocka 187372c6e7afSMikulas Patocka static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) 18744e4eef64SMilan Broz { 1875dec1cedfSMilan Broz struct bio *clone = io->ctx.bio_out; 187649a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 1877dc267621SMikulas Patocka unsigned long flags; 1878b3c5fd30SMikulas Patocka sector_t sector; 1879b3c5fd30SMikulas Patocka struct rb_node **rbp, *parent; 1880dec1cedfSMilan Broz 18814e4cbee9SChristoph Hellwig if (unlikely(io->error)) { 1882dec1cedfSMilan Broz crypt_free_buffer_pages(cc, clone); 1883dec1cedfSMilan Broz bio_put(clone); 18846c031f41SMilan Broz crypt_dec_pending(io); 1885dec1cedfSMilan Broz return; 1886dec1cedfSMilan Broz } 1887dec1cedfSMilan Broz 1888dec1cedfSMilan Broz /* crypt_convert should have filled the clone bio */ 1889003b5c57SKent Overstreet BUG_ON(io->ctx.iter_out.bi_size); 1890dec1cedfSMilan Broz 18914f024f37SKent Overstreet clone->bi_iter.bi_sector = cc->start + io->sector; 1892899c95d3SMilan Broz 18930f5d8e6eSMikulas Patocka if (likely(!async) && test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) { 18940f5d8e6eSMikulas Patocka generic_make_request(clone); 18950f5d8e6eSMikulas Patocka return; 18960f5d8e6eSMikulas Patocka } 18970f5d8e6eSMikulas Patocka 1898c7329effSMikulas Patocka spin_lock_irqsave(&cc->write_thread_lock, flags); 1899c7329effSMikulas Patocka if (RB_EMPTY_ROOT(&cc->write_tree)) 1900c7329effSMikulas Patocka wake_up_process(cc->write_thread); 1901b3c5fd30SMikulas Patocka rbp = &cc->write_tree.rb_node; 1902b3c5fd30SMikulas Patocka parent = NULL; 1903b3c5fd30SMikulas Patocka sector = io->sector; 1904b3c5fd30SMikulas Patocka while (*rbp) { 1905b3c5fd30SMikulas Patocka parent = *rbp; 1906b3c5fd30SMikulas Patocka if (sector < crypt_io_from_node(parent)->sector) 1907b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_left; 1908b3c5fd30SMikulas Patocka else 1909b3c5fd30SMikulas Patocka rbp = &(*rbp)->rb_right; 1910b3c5fd30SMikulas Patocka } 1911b3c5fd30SMikulas Patocka rb_link_node(&io->rb_node, parent, rbp); 1912b3c5fd30SMikulas Patocka rb_insert_color(&io->rb_node, &cc->write_tree); 1913c7329effSMikulas Patocka spin_unlock_irqrestore(&cc->write_thread_lock, flags); 19144e4eef64SMilan Broz } 19154e4eef64SMilan Broz 1916fc5a5e9aSMilan Broz static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 19178b004457SMilan Broz { 191849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 19198b004457SMilan Broz struct bio *clone; 1920c8081618SMilan Broz int crypt_finished; 1921b635b00eSMilan Broz sector_t sector = io->sector; 19224e4cbee9SChristoph Hellwig blk_status_t r; 19238b004457SMilan Broz 192493e605c2SMilan Broz /* 1925fc5a5e9aSMilan Broz * Prevent io from disappearing until this function completes. 1926fc5a5e9aSMilan Broz */ 1927fc5a5e9aSMilan Broz crypt_inc_pending(io); 1928b635b00eSMilan Broz crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); 1929fc5a5e9aSMilan Broz 1930cf2f1abfSMikulas Patocka clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); 193123541d2dSMilan Broz if (unlikely(!clone)) { 19324e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 1933cf2f1abfSMikulas Patocka goto dec; 193423541d2dSMilan Broz } 19358b004457SMilan Broz 193653017030SMilan Broz io->ctx.bio_out = clone; 1937003b5c57SKent Overstreet io->ctx.iter_out = clone->bi_iter; 19388b004457SMilan Broz 1939b635b00eSMilan Broz sector += bio_sectors(clone); 1940dec1cedfSMilan Broz 19414e594098SMilan Broz crypt_inc_pending(io); 1942dec1cedfSMilan Broz r = crypt_convert(cc, &io->ctx); 19434e4cbee9SChristoph Hellwig if (r) 1944ef43aa38SMilan Broz io->error = r; 194540b6229bSMikulas Patocka crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); 1946dec1cedfSMilan Broz 1947c8081618SMilan Broz /* Encryption was already finished, submit io now */ 1948c8081618SMilan Broz if (crypt_finished) { 194972c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 0); 1950b635b00eSMilan Broz io->sector = sector; 19514e594098SMilan Broz } 195293e605c2SMilan Broz 1953cf2f1abfSMikulas Patocka dec: 1954899c95d3SMilan Broz crypt_dec_pending(io); 195584131db6SMilan Broz } 195684131db6SMilan Broz 195772c6e7afSMikulas Patocka static void kcryptd_crypt_read_done(struct dm_crypt_io *io) 19585742fd77SMilan Broz { 19595742fd77SMilan Broz crypt_dec_pending(io); 19605742fd77SMilan Broz } 19615742fd77SMilan Broz 19624e4eef64SMilan Broz static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 19638b004457SMilan Broz { 196449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 19654e4cbee9SChristoph Hellwig blk_status_t r; 19668b004457SMilan Broz 19673e1a8bddSMilan Broz crypt_inc_pending(io); 19683a7f6c99SMilan Broz 196953017030SMilan Broz crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, 19700c395b0fSMilan Broz io->sector); 19718b004457SMilan Broz 19725742fd77SMilan Broz r = crypt_convert(cc, &io->ctx); 19734e4cbee9SChristoph Hellwig if (r) 1974ef43aa38SMilan Broz io->error = r; 19755742fd77SMilan Broz 197640b6229bSMikulas Patocka if (atomic_dec_and_test(&io->ctx.cc_pending)) 197772c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 19783a7f6c99SMilan Broz 19793a7f6c99SMilan Broz crypt_dec_pending(io); 19808b004457SMilan Broz } 19818b004457SMilan Broz 198295497a96SMilan Broz static void kcryptd_async_done(struct crypto_async_request *async_req, 198395497a96SMilan Broz int error) 198495497a96SMilan Broz { 1985b2174eebSHuang Ying struct dm_crypt_request *dmreq = async_req->data; 1986b2174eebSHuang Ying struct convert_context *ctx = dmreq->ctx; 198795497a96SMilan Broz struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); 198849a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 198995497a96SMilan Broz 199054cea3f6SMilan Broz /* 199154cea3f6SMilan Broz * A request from crypto driver backlog is going to be processed now, 199254cea3f6SMilan Broz * finish the completion and continue in crypt_convert(). 199354cea3f6SMilan Broz * (Callback will be called for the second time for this request.) 199454cea3f6SMilan Broz */ 1995c0403ec0SRabin Vincent if (error == -EINPROGRESS) { 1996c0403ec0SRabin Vincent complete(&ctx->restart); 199795497a96SMilan Broz return; 1998c0403ec0SRabin Vincent } 199995497a96SMilan Broz 20002dc5327dSMilan Broz if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) 2001ef43aa38SMilan Broz error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); 20022dc5327dSMilan Broz 2003ef43aa38SMilan Broz if (error == -EBADMSG) { 2004f710126cSMilan Broz char b[BDEVNAME_SIZE]; 2005f710126cSMilan Broz DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), 2006ef43aa38SMilan Broz (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); 20074e4cbee9SChristoph Hellwig io->error = BLK_STS_PROTECTION; 2008ef43aa38SMilan Broz } else if (error < 0) 20094e4cbee9SChristoph Hellwig io->error = BLK_STS_IOERR; 201072c6e7afSMikulas Patocka 2011298a9fa0SMikulas Patocka crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); 201295497a96SMilan Broz 201340b6229bSMikulas Patocka if (!atomic_dec_and_test(&ctx->cc_pending)) 2014c0403ec0SRabin Vincent return; 201595497a96SMilan Broz 201695497a96SMilan Broz if (bio_data_dir(io->base_bio) == READ) 201772c6e7afSMikulas Patocka kcryptd_crypt_read_done(io); 201895497a96SMilan Broz else 201972c6e7afSMikulas Patocka kcryptd_crypt_write_io_submit(io, 1); 202095497a96SMilan Broz } 202195497a96SMilan Broz 20224e4eef64SMilan Broz static void kcryptd_crypt(struct work_struct *work) 20234e4eef64SMilan Broz { 20244e4eef64SMilan Broz struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); 20254e4eef64SMilan Broz 20264e4eef64SMilan Broz if (bio_data_dir(io->base_bio) == READ) 20274e4eef64SMilan Broz kcryptd_crypt_read_convert(io); 20284e4eef64SMilan Broz else 20294e4eef64SMilan Broz kcryptd_crypt_write_convert(io); 20308b004457SMilan Broz } 20318b004457SMilan Broz 2032395b167cSAlasdair G Kergon static void kcryptd_queue_crypt(struct dm_crypt_io *io) 2033395b167cSAlasdair G Kergon { 203449a8a920SAlasdair G Kergon struct crypt_config *cc = io->cc; 2035395b167cSAlasdair G Kergon 2036395b167cSAlasdair G Kergon INIT_WORK(&io->work, kcryptd_crypt); 2037395b167cSAlasdair G Kergon queue_work(cc->crypt_queue, &io->work); 2038395b167cSAlasdair G Kergon } 2039395b167cSAlasdair G Kergon 2040ef43aa38SMilan Broz static void crypt_free_tfms_aead(struct crypt_config *cc) 20411da177e4SLinus Torvalds { 2042ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms_aead) 2043ef43aa38SMilan Broz return; 20441da177e4SLinus Torvalds 2045ef43aa38SMilan Broz if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2046ef43aa38SMilan Broz crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); 2047ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = NULL; 20481da177e4SLinus Torvalds } 20491da177e4SLinus Torvalds 2050ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms_aead); 2051ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead = NULL; 2052ef43aa38SMilan Broz } 20531da177e4SLinus Torvalds 2054ef43aa38SMilan Broz static void crypt_free_tfms_skcipher(struct crypt_config *cc) 2055d1f96423SMilan Broz { 2056d1f96423SMilan Broz unsigned i; 2057d1f96423SMilan Broz 2058ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2059fd2d231fSMikulas Patocka return; 2060fd2d231fSMikulas Patocka 2061d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) 2062ef43aa38SMilan Broz if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { 2063ef43aa38SMilan Broz crypto_free_skcipher(cc->cipher_tfm.tfms[i]); 2064ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = NULL; 2065d1f96423SMilan Broz } 2066d1f96423SMilan Broz 2067ef43aa38SMilan Broz kfree(cc->cipher_tfm.tfms); 2068ef43aa38SMilan Broz cc->cipher_tfm.tfms = NULL; 20691da177e4SLinus Torvalds } 20701da177e4SLinus Torvalds 20711da177e4SLinus Torvalds static void crypt_free_tfms(struct crypt_config *cc) 2072d1f96423SMilan Broz { 207333d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2074ef43aa38SMilan Broz crypt_free_tfms_aead(cc); 2075ef43aa38SMilan Broz else 2076ef43aa38SMilan Broz crypt_free_tfms_skcipher(cc); 2077d1f96423SMilan Broz } 2078d1f96423SMilan Broz 2079ef43aa38SMilan Broz static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) 2080d1f96423SMilan Broz { 2081d1f96423SMilan Broz unsigned i; 2082d1f96423SMilan Broz int err; 2083d1f96423SMilan Broz 20846396bb22SKees Cook cc->cipher_tfm.tfms = kcalloc(cc->tfms_count, 20856396bb22SKees Cook sizeof(struct crypto_skcipher *), 20866396bb22SKees Cook GFP_KERNEL); 2087ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2088fd2d231fSMikulas Patocka return -ENOMEM; 2089fd2d231fSMikulas Patocka 2090d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 2091ef43aa38SMilan Broz cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); 2092ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms[i])) { 2093ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms[i]); 2094fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2095d1f96423SMilan Broz return err; 2096d1f96423SMilan Broz } 2097d1f96423SMilan Broz } 2098d1f96423SMilan Broz 2099af331ebaSEric Biggers /* 2100af331ebaSEric Biggers * dm-crypt performance can vary greatly depending on which crypto 2101af331ebaSEric Biggers * algorithm implementation is used. Help people debug performance 2102af331ebaSEric Biggers * problems by logging the ->cra_driver_name. 2103af331ebaSEric Biggers */ 21047a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2105af331ebaSEric Biggers crypto_skcipher_alg(any_tfm(cc))->base.cra_driver_name); 2106d1f96423SMilan Broz return 0; 2107d1f96423SMilan Broz } 2108d1f96423SMilan Broz 2109ef43aa38SMilan Broz static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) 2110ef43aa38SMilan Broz { 2111ef43aa38SMilan Broz int err; 2112ef43aa38SMilan Broz 2113ef43aa38SMilan Broz cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); 2114ef43aa38SMilan Broz if (!cc->cipher_tfm.tfms) 2115ef43aa38SMilan Broz return -ENOMEM; 2116ef43aa38SMilan Broz 2117ef43aa38SMilan Broz cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); 2118ef43aa38SMilan Broz if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { 2119ef43aa38SMilan Broz err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); 2120ef43aa38SMilan Broz crypt_free_tfms(cc); 2121ef43aa38SMilan Broz return err; 2122ef43aa38SMilan Broz } 2123ef43aa38SMilan Broz 21247a1cd723SMilan Broz DMDEBUG_LIMIT("%s using implementation \"%s\"", ciphermode, 2125af331ebaSEric Biggers crypto_aead_alg(any_tfm_aead(cc))->base.cra_driver_name); 2126ef43aa38SMilan Broz return 0; 2127ef43aa38SMilan Broz } 2128ef43aa38SMilan Broz 2129ef43aa38SMilan Broz static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) 2130ef43aa38SMilan Broz { 213133d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2132ef43aa38SMilan Broz return crypt_alloc_tfms_aead(cc, ciphermode); 2133ef43aa38SMilan Broz else 2134ef43aa38SMilan Broz return crypt_alloc_tfms_skcipher(cc, ciphermode); 2135ef43aa38SMilan Broz } 2136ef43aa38SMilan Broz 2137ef43aa38SMilan Broz static unsigned crypt_subkey_size(struct crypt_config *cc) 2138ef43aa38SMilan Broz { 2139ef43aa38SMilan Broz return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); 2140ef43aa38SMilan Broz } 2141ef43aa38SMilan Broz 2142ef43aa38SMilan Broz static unsigned crypt_authenckey_size(struct crypt_config *cc) 2143ef43aa38SMilan Broz { 2144ef43aa38SMilan Broz return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); 2145ef43aa38SMilan Broz } 2146ef43aa38SMilan Broz 2147ef43aa38SMilan Broz /* 2148ef43aa38SMilan Broz * If AEAD is composed like authenc(hmac(sha256),xts(aes)), 2149ef43aa38SMilan Broz * the key must be for some reason in special format. 2150ef43aa38SMilan Broz * This funcion converts cc->key to this special format. 2151ef43aa38SMilan Broz */ 2152ef43aa38SMilan Broz static void crypt_copy_authenckey(char *p, const void *key, 2153ef43aa38SMilan Broz unsigned enckeylen, unsigned authkeylen) 2154ef43aa38SMilan Broz { 2155ef43aa38SMilan Broz struct crypto_authenc_key_param *param; 2156ef43aa38SMilan Broz struct rtattr *rta; 2157ef43aa38SMilan Broz 2158ef43aa38SMilan Broz rta = (struct rtattr *)p; 2159ef43aa38SMilan Broz param = RTA_DATA(rta); 2160ef43aa38SMilan Broz param->enckeylen = cpu_to_be32(enckeylen); 2161ef43aa38SMilan Broz rta->rta_len = RTA_LENGTH(sizeof(*param)); 2162ef43aa38SMilan Broz rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; 2163ef43aa38SMilan Broz p += RTA_SPACE(sizeof(*param)); 2164ef43aa38SMilan Broz memcpy(p, key + enckeylen, authkeylen); 2165ef43aa38SMilan Broz p += authkeylen; 2166ef43aa38SMilan Broz memcpy(p, key, enckeylen); 2167ef43aa38SMilan Broz } 2168ef43aa38SMilan Broz 2169671ea6b4SMikulas Patocka static int crypt_setkey(struct crypt_config *cc) 2170c0297721SAndi Kleen { 2171da31a078SMilan Broz unsigned subkey_size; 2172fd2d231fSMikulas Patocka int err = 0, i, r; 2173c0297721SAndi Kleen 2174da31a078SMilan Broz /* Ignore extra keys (which are used for IV etc) */ 2175ef43aa38SMilan Broz subkey_size = crypt_subkey_size(cc); 2176da31a078SMilan Broz 217727c70036SMilan Broz if (crypt_integrity_hmac(cc)) { 217827c70036SMilan Broz if (subkey_size < cc->key_mac_size) 217927c70036SMilan Broz return -EINVAL; 218027c70036SMilan Broz 2181ef43aa38SMilan Broz crypt_copy_authenckey(cc->authenc_key, cc->key, 2182ef43aa38SMilan Broz subkey_size - cc->key_mac_size, 2183ef43aa38SMilan Broz cc->key_mac_size); 218427c70036SMilan Broz } 218527c70036SMilan Broz 2186d1f96423SMilan Broz for (i = 0; i < cc->tfms_count; i++) { 218733d2f09fSMilan Broz if (crypt_integrity_hmac(cc)) 218833d2f09fSMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 218933d2f09fSMilan Broz cc->authenc_key, crypt_authenckey_size(cc)); 219033d2f09fSMilan Broz else if (crypt_integrity_aead(cc)) 2191ef43aa38SMilan Broz r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], 2192ef43aa38SMilan Broz cc->key + (i * subkey_size), 2193ef43aa38SMilan Broz subkey_size); 2194ef43aa38SMilan Broz else 2195ef43aa38SMilan Broz r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], 2196fd2d231fSMikulas Patocka cc->key + (i * subkey_size), 2197fd2d231fSMikulas Patocka subkey_size); 2198c0297721SAndi Kleen if (r) 2199c0297721SAndi Kleen err = r; 2200c0297721SAndi Kleen } 2201c0297721SAndi Kleen 2202ef43aa38SMilan Broz if (crypt_integrity_hmac(cc)) 2203ef43aa38SMilan Broz memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); 2204ef43aa38SMilan Broz 2205c0297721SAndi Kleen return err; 2206c0297721SAndi Kleen } 2207c0297721SAndi Kleen 2208c538f6ecSOndrej Kozina #ifdef CONFIG_KEYS 2209c538f6ecSOndrej Kozina 2210027c431cSOndrej Kozina static bool contains_whitespace(const char *str) 2211027c431cSOndrej Kozina { 2212027c431cSOndrej Kozina while (*str) 2213027c431cSOndrej Kozina if (isspace(*str++)) 2214027c431cSOndrej Kozina return true; 2215027c431cSOndrej Kozina return false; 2216027c431cSOndrej Kozina } 2217027c431cSOndrej Kozina 2218c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2219c538f6ecSOndrej Kozina { 2220c538f6ecSOndrej Kozina char *new_key_string, *key_desc; 2221c538f6ecSOndrej Kozina int ret; 2222c538f6ecSOndrej Kozina struct key *key; 2223c538f6ecSOndrej Kozina const struct user_key_payload *ukp; 2224c538f6ecSOndrej Kozina 2225027c431cSOndrej Kozina /* 2226027c431cSOndrej Kozina * Reject key_string with whitespace. dm core currently lacks code for 2227027c431cSOndrej Kozina * proper whitespace escaping in arguments on DM_TABLE_STATUS path. 2228027c431cSOndrej Kozina */ 2229027c431cSOndrej Kozina if (contains_whitespace(key_string)) { 2230027c431cSOndrej Kozina DMERR("whitespace chars not allowed in key string"); 2231027c431cSOndrej Kozina return -EINVAL; 2232027c431cSOndrej Kozina } 2233027c431cSOndrej Kozina 2234c538f6ecSOndrej Kozina /* look for next ':' separating key_type from key_description */ 2235c538f6ecSOndrej Kozina key_desc = strpbrk(key_string, ":"); 2236c538f6ecSOndrej Kozina if (!key_desc || key_desc == key_string || !strlen(key_desc + 1)) 2237c538f6ecSOndrej Kozina return -EINVAL; 2238c538f6ecSOndrej Kozina 2239c538f6ecSOndrej Kozina if (strncmp(key_string, "logon:", key_desc - key_string + 1) && 2240c538f6ecSOndrej Kozina strncmp(key_string, "user:", key_desc - key_string + 1)) 2241c538f6ecSOndrej Kozina return -EINVAL; 2242c538f6ecSOndrej Kozina 2243c538f6ecSOndrej Kozina new_key_string = kstrdup(key_string, GFP_KERNEL); 2244c538f6ecSOndrej Kozina if (!new_key_string) 2245c538f6ecSOndrej Kozina return -ENOMEM; 2246c538f6ecSOndrej Kozina 2247c538f6ecSOndrej Kozina key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user, 2248c538f6ecSOndrej Kozina key_desc + 1, NULL); 2249c538f6ecSOndrej Kozina if (IS_ERR(key)) { 2250c538f6ecSOndrej Kozina kzfree(new_key_string); 2251c538f6ecSOndrej Kozina return PTR_ERR(key); 2252c538f6ecSOndrej Kozina } 2253c538f6ecSOndrej Kozina 2254f5b0cba8SOndrej Kozina down_read(&key->sem); 2255c538f6ecSOndrej Kozina 22560837e49aSDavid Howells ukp = user_key_payload_locked(key); 2257c538f6ecSOndrej Kozina if (!ukp) { 2258f5b0cba8SOndrej Kozina up_read(&key->sem); 2259c538f6ecSOndrej Kozina key_put(key); 2260c538f6ecSOndrej Kozina kzfree(new_key_string); 2261c538f6ecSOndrej Kozina return -EKEYREVOKED; 2262c538f6ecSOndrej Kozina } 2263c538f6ecSOndrej Kozina 2264c538f6ecSOndrej Kozina if (cc->key_size != ukp->datalen) { 2265f5b0cba8SOndrej Kozina up_read(&key->sem); 2266c538f6ecSOndrej Kozina key_put(key); 2267c538f6ecSOndrej Kozina kzfree(new_key_string); 2268c538f6ecSOndrej Kozina return -EINVAL; 2269c538f6ecSOndrej Kozina } 2270c538f6ecSOndrej Kozina 2271c538f6ecSOndrej Kozina memcpy(cc->key, ukp->data, cc->key_size); 2272c538f6ecSOndrej Kozina 2273f5b0cba8SOndrej Kozina up_read(&key->sem); 2274c538f6ecSOndrej Kozina key_put(key); 2275c538f6ecSOndrej Kozina 2276c538f6ecSOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2277c538f6ecSOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2278c538f6ecSOndrej Kozina 2279c538f6ecSOndrej Kozina ret = crypt_setkey(cc); 2280c538f6ecSOndrej Kozina 2281c538f6ecSOndrej Kozina if (!ret) { 2282c538f6ecSOndrej Kozina set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2283c538f6ecSOndrej Kozina kzfree(cc->key_string); 2284c538f6ecSOndrej Kozina cc->key_string = new_key_string; 2285c538f6ecSOndrej Kozina } else 2286c538f6ecSOndrej Kozina kzfree(new_key_string); 2287c538f6ecSOndrej Kozina 2288c538f6ecSOndrej Kozina return ret; 2289c538f6ecSOndrej Kozina } 2290c538f6ecSOndrej Kozina 2291c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2292c538f6ecSOndrej Kozina { 2293c538f6ecSOndrej Kozina char *colon, dummy; 2294c538f6ecSOndrej Kozina int ret; 2295c538f6ecSOndrej Kozina 2296c538f6ecSOndrej Kozina if (*key_string[0] != ':') 2297c538f6ecSOndrej Kozina return strlen(*key_string) >> 1; 2298c538f6ecSOndrej Kozina 2299c538f6ecSOndrej Kozina /* look for next ':' in key string */ 2300c538f6ecSOndrej Kozina colon = strpbrk(*key_string + 1, ":"); 2301c538f6ecSOndrej Kozina if (!colon) 2302c538f6ecSOndrej Kozina return -EINVAL; 2303c538f6ecSOndrej Kozina 2304c538f6ecSOndrej Kozina if (sscanf(*key_string + 1, "%u%c", &ret, &dummy) != 2 || dummy != ':') 2305c538f6ecSOndrej Kozina return -EINVAL; 2306c538f6ecSOndrej Kozina 2307c538f6ecSOndrej Kozina *key_string = colon; 2308c538f6ecSOndrej Kozina 2309c538f6ecSOndrej Kozina /* remaining key string should be :<logon|user>:<key_desc> */ 2310c538f6ecSOndrej Kozina 2311c538f6ecSOndrej Kozina return ret; 2312c538f6ecSOndrej Kozina } 2313c538f6ecSOndrej Kozina 2314c538f6ecSOndrej Kozina #else 2315c538f6ecSOndrej Kozina 2316c538f6ecSOndrej Kozina static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string) 2317c538f6ecSOndrej Kozina { 2318c538f6ecSOndrej Kozina return -EINVAL; 2319c538f6ecSOndrej Kozina } 2320c538f6ecSOndrej Kozina 2321c538f6ecSOndrej Kozina static int get_key_size(char **key_string) 2322c538f6ecSOndrej Kozina { 2323c538f6ecSOndrej Kozina return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1; 2324c538f6ecSOndrej Kozina } 2325c538f6ecSOndrej Kozina 2326c538f6ecSOndrej Kozina #endif 2327c538f6ecSOndrej Kozina 2328e48d4bbfSMilan Broz static int crypt_set_key(struct crypt_config *cc, char *key) 2329e48d4bbfSMilan Broz { 2330de8be5acSMilan Broz int r = -EINVAL; 2331de8be5acSMilan Broz int key_string_len = strlen(key); 2332de8be5acSMilan Broz 233369a8cfcdSMilan Broz /* Hyphen (which gives a key_size of zero) means there is no key. */ 233469a8cfcdSMilan Broz if (!cc->key_size && strcmp(key, "-")) 2335de8be5acSMilan Broz goto out; 2336e48d4bbfSMilan Broz 2337c538f6ecSOndrej Kozina /* ':' means the key is in kernel keyring, short-circuit normal key processing */ 2338c538f6ecSOndrej Kozina if (key[0] == ':') { 2339c538f6ecSOndrej Kozina r = crypt_set_keyring_key(cc, key + 1); 2340c538f6ecSOndrej Kozina goto out; 2341c538f6ecSOndrej Kozina } 2342c538f6ecSOndrej Kozina 2343265e9098SOndrej Kozina /* clear the flag since following operations may invalidate previously valid key */ 2344265e9098SOndrej Kozina clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2345265e9098SOndrej Kozina 2346c538f6ecSOndrej Kozina /* wipe references to any kernel keyring key */ 2347c538f6ecSOndrej Kozina kzfree(cc->key_string); 2348c538f6ecSOndrej Kozina cc->key_string = NULL; 2349c538f6ecSOndrej Kozina 2350e944e03eSAndy Shevchenko /* Decode key from its hex representation. */ 2351e944e03eSAndy Shevchenko if (cc->key_size && hex2bin(cc->key, key, cc->key_size) < 0) 2352de8be5acSMilan Broz goto out; 2353e48d4bbfSMilan Broz 2354671ea6b4SMikulas Patocka r = crypt_setkey(cc); 2355265e9098SOndrej Kozina if (!r) 2356e48d4bbfSMilan Broz set_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2357e48d4bbfSMilan Broz 2358de8be5acSMilan Broz out: 2359de8be5acSMilan Broz /* Hex key string not needed after here, so wipe it. */ 2360de8be5acSMilan Broz memset(key, '0', key_string_len); 2361de8be5acSMilan Broz 2362de8be5acSMilan Broz return r; 2363e48d4bbfSMilan Broz } 2364e48d4bbfSMilan Broz 2365e48d4bbfSMilan Broz static int crypt_wipe_key(struct crypt_config *cc) 2366e48d4bbfSMilan Broz { 2367c82feeecSOndrej Kozina int r; 2368c82feeecSOndrej Kozina 2369e48d4bbfSMilan Broz clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); 2370c82feeecSOndrej Kozina get_random_bytes(&cc->key, cc->key_size); 23714a52ffc7SMilan Broz 23724a52ffc7SMilan Broz /* Wipe IV private keys */ 23734a52ffc7SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { 23744a52ffc7SMilan Broz r = cc->iv_gen_ops->wipe(cc); 23754a52ffc7SMilan Broz if (r) 23764a52ffc7SMilan Broz return r; 23774a52ffc7SMilan Broz } 23784a52ffc7SMilan Broz 2379c538f6ecSOndrej Kozina kzfree(cc->key_string); 2380c538f6ecSOndrej Kozina cc->key_string = NULL; 2381c82feeecSOndrej Kozina r = crypt_setkey(cc); 2382c82feeecSOndrej Kozina memset(&cc->key, 0, cc->key_size * sizeof(u8)); 2383c0297721SAndi Kleen 2384c82feeecSOndrej Kozina return r; 2385e48d4bbfSMilan Broz } 2386e48d4bbfSMilan Broz 23875059353dSMikulas Patocka static void crypt_calculate_pages_per_client(void) 23885059353dSMikulas Patocka { 2389ca79b0c2SArun KS unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; 23905059353dSMikulas Patocka 23915059353dSMikulas Patocka if (!dm_crypt_clients_n) 23925059353dSMikulas Patocka return; 23935059353dSMikulas Patocka 23945059353dSMikulas Patocka pages /= dm_crypt_clients_n; 23955059353dSMikulas Patocka if (pages < DM_CRYPT_MIN_PAGES_PER_CLIENT) 23965059353dSMikulas Patocka pages = DM_CRYPT_MIN_PAGES_PER_CLIENT; 23975059353dSMikulas Patocka dm_crypt_pages_per_client = pages; 23985059353dSMikulas Patocka } 23995059353dSMikulas Patocka 24005059353dSMikulas Patocka static void *crypt_page_alloc(gfp_t gfp_mask, void *pool_data) 24015059353dSMikulas Patocka { 24025059353dSMikulas Patocka struct crypt_config *cc = pool_data; 24035059353dSMikulas Patocka struct page *page; 24045059353dSMikulas Patocka 24055059353dSMikulas Patocka if (unlikely(percpu_counter_compare(&cc->n_allocated_pages, dm_crypt_pages_per_client) >= 0) && 24065059353dSMikulas Patocka likely(gfp_mask & __GFP_NORETRY)) 24075059353dSMikulas Patocka return NULL; 24085059353dSMikulas Patocka 24095059353dSMikulas Patocka page = alloc_page(gfp_mask); 24105059353dSMikulas Patocka if (likely(page != NULL)) 24115059353dSMikulas Patocka percpu_counter_add(&cc->n_allocated_pages, 1); 24125059353dSMikulas Patocka 24135059353dSMikulas Patocka return page; 24145059353dSMikulas Patocka } 24155059353dSMikulas Patocka 24165059353dSMikulas Patocka static void crypt_page_free(void *page, void *pool_data) 24175059353dSMikulas Patocka { 24185059353dSMikulas Patocka struct crypt_config *cc = pool_data; 24195059353dSMikulas Patocka 24205059353dSMikulas Patocka __free_page(page); 24215059353dSMikulas Patocka percpu_counter_sub(&cc->n_allocated_pages, 1); 24225059353dSMikulas Patocka } 24235059353dSMikulas Patocka 242428513fccSMilan Broz static void crypt_dtr(struct dm_target *ti) 242528513fccSMilan Broz { 242628513fccSMilan Broz struct crypt_config *cc = ti->private; 242728513fccSMilan Broz 242828513fccSMilan Broz ti->private = NULL; 242928513fccSMilan Broz 243028513fccSMilan Broz if (!cc) 243128513fccSMilan Broz return; 243228513fccSMilan Broz 2433f659b100SRabin Vincent if (cc->write_thread) 2434dc267621SMikulas Patocka kthread_stop(cc->write_thread); 2435dc267621SMikulas Patocka 243628513fccSMilan Broz if (cc->io_queue) 243728513fccSMilan Broz destroy_workqueue(cc->io_queue); 243828513fccSMilan Broz if (cc->crypt_queue) 243928513fccSMilan Broz destroy_workqueue(cc->crypt_queue); 244028513fccSMilan Broz 2441fd2d231fSMikulas Patocka crypt_free_tfms(cc); 2442fd2d231fSMikulas Patocka 24436f1c819cSKent Overstreet bioset_exit(&cc->bs); 244428513fccSMilan Broz 24456f1c819cSKent Overstreet mempool_exit(&cc->page_pool); 24466f1c819cSKent Overstreet mempool_exit(&cc->req_pool); 24476f1c819cSKent Overstreet mempool_exit(&cc->tag_pool); 24486f1c819cSKent Overstreet 2449d00a11dfSKent Overstreet WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0); 2450d00a11dfSKent Overstreet percpu_counter_destroy(&cc->n_allocated_pages); 2451d00a11dfSKent Overstreet 245228513fccSMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) 245328513fccSMilan Broz cc->iv_gen_ops->dtr(cc); 245428513fccSMilan Broz 245528513fccSMilan Broz if (cc->dev) 245628513fccSMilan Broz dm_put_device(ti, cc->dev); 245728513fccSMilan Broz 24587dbcd137SMilan Broz kzfree(cc->cipher_string); 2459c538f6ecSOndrej Kozina kzfree(cc->key_string); 2460ef43aa38SMilan Broz kzfree(cc->cipher_auth); 2461ef43aa38SMilan Broz kzfree(cc->authenc_key); 246228513fccSMilan Broz 2463d5ffebddSMike Snitzer mutex_destroy(&cc->bio_alloc_lock); 2464d5ffebddSMike Snitzer 246528513fccSMilan Broz /* Must zero key material before freeing */ 246628513fccSMilan Broz kzfree(cc); 24675059353dSMikulas Patocka 24685059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 24695059353dSMikulas Patocka WARN_ON(!dm_crypt_clients_n); 24705059353dSMikulas Patocka dm_crypt_clients_n--; 24715059353dSMikulas Patocka crypt_calculate_pages_per_client(); 24725059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 247328513fccSMilan Broz } 247428513fccSMilan Broz 2475e889f97aSMilan Broz static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) 24761da177e4SLinus Torvalds { 24775ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 24781da177e4SLinus Torvalds 247933d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 2480e889f97aSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2481e889f97aSMilan Broz else 2482bbdb23b5SHerbert Xu cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 2483e889f97aSMilan Broz 24845ebaee6dSMilan Broz if (cc->iv_size) 24855ebaee6dSMilan Broz /* at least a 64 bit sector number should fit in our buffer */ 24865ebaee6dSMilan Broz cc->iv_size = max(cc->iv_size, 24875ebaee6dSMilan Broz (unsigned int)(sizeof(u64) / sizeof(u8))); 24885ebaee6dSMilan Broz else if (ivmode) { 24895ebaee6dSMilan Broz DMWARN("Selected cipher does not support IVs"); 24905ebaee6dSMilan Broz ivmode = NULL; 24915ebaee6dSMilan Broz } 24925ebaee6dSMilan Broz 24935ebaee6dSMilan Broz /* Choose ivmode, see comments at iv code. */ 24941da177e4SLinus Torvalds if (ivmode == NULL) 24951da177e4SLinus Torvalds cc->iv_gen_ops = NULL; 24961da177e4SLinus Torvalds else if (strcmp(ivmode, "plain") == 0) 24971da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_plain_ops; 249861afef61SMilan Broz else if (strcmp(ivmode, "plain64") == 0) 249961afef61SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64_ops; 25007e3fd855SMilan Broz else if (strcmp(ivmode, "plain64be") == 0) 25017e3fd855SMilan Broz cc->iv_gen_ops = &crypt_iv_plain64be_ops; 25021da177e4SLinus Torvalds else if (strcmp(ivmode, "essiv") == 0) 25031da177e4SLinus Torvalds cc->iv_gen_ops = &crypt_iv_essiv_ops; 250448527fa7SRik Snel else if (strcmp(ivmode, "benbi") == 0) 250548527fa7SRik Snel cc->iv_gen_ops = &crypt_iv_benbi_ops; 250646b47730SLudwig Nussel else if (strcmp(ivmode, "null") == 0) 250746b47730SLudwig Nussel cc->iv_gen_ops = &crypt_iv_null_ops; 2508b9411d73SMilan Broz else if (strcmp(ivmode, "eboiv") == 0) 2509b9411d73SMilan Broz cc->iv_gen_ops = &crypt_iv_eboiv_ops; 2510bbb16584SMilan Broz else if (strcmp(ivmode, "elephant") == 0) { 2511bbb16584SMilan Broz cc->iv_gen_ops = &crypt_iv_elephant_ops; 2512bbb16584SMilan Broz cc->key_parts = 2; 2513bbb16584SMilan Broz cc->key_extra_size = cc->key_size / 2; 2514bbb16584SMilan Broz if (cc->key_extra_size > ELEPHANT_MAX_KEY_SIZE) 2515bbb16584SMilan Broz return -EINVAL; 2516bbb16584SMilan Broz set_bit(CRYPT_ENCRYPT_PREPROCESS, &cc->cipher_flags); 2517bbb16584SMilan Broz } else if (strcmp(ivmode, "lmk") == 0) { 251834745785SMilan Broz cc->iv_gen_ops = &crypt_iv_lmk_ops; 2519ed04d981SMilan Broz /* 2520ed04d981SMilan Broz * Version 2 and 3 is recognised according 252134745785SMilan Broz * to length of provided multi-key string. 252234745785SMilan Broz * If present (version 3), last key is used as IV seed. 2523ed04d981SMilan Broz * All keys (including IV seed) are always the same size. 252434745785SMilan Broz */ 2525da31a078SMilan Broz if (cc->key_size % cc->key_parts) { 252634745785SMilan Broz cc->key_parts++; 2527da31a078SMilan Broz cc->key_extra_size = cc->key_size / cc->key_parts; 2528da31a078SMilan Broz } 2529ed04d981SMilan Broz } else if (strcmp(ivmode, "tcw") == 0) { 2530ed04d981SMilan Broz cc->iv_gen_ops = &crypt_iv_tcw_ops; 2531ed04d981SMilan Broz cc->key_parts += 2; /* IV + whitening */ 2532ed04d981SMilan Broz cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; 2533e889f97aSMilan Broz } else if (strcmp(ivmode, "random") == 0) { 2534e889f97aSMilan Broz cc->iv_gen_ops = &crypt_iv_random_ops; 2535e889f97aSMilan Broz /* Need storage space in integrity fields. */ 2536e889f97aSMilan Broz cc->integrity_iv_size = cc->iv_size; 253734745785SMilan Broz } else { 253872d94861SAlasdair G Kergon ti->error = "Invalid IV mode"; 2539e889f97aSMilan Broz return -EINVAL; 25401da177e4SLinus Torvalds } 25411da177e4SLinus Torvalds 2542e889f97aSMilan Broz return 0; 2543e889f97aSMilan Broz } 2544e889f97aSMilan Broz 254533d2f09fSMilan Broz /* 254633d2f09fSMilan Broz * Workaround to parse HMAC algorithm from AEAD crypto API spec. 254733d2f09fSMilan Broz * The HMAC is needed to calculate tag size (HMAC digest size). 254833d2f09fSMilan Broz * This should be probably done by crypto-api calls (once available...) 254933d2f09fSMilan Broz */ 255033d2f09fSMilan Broz static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api) 255133d2f09fSMilan Broz { 255233d2f09fSMilan Broz char *start, *end, *mac_alg = NULL; 255333d2f09fSMilan Broz struct crypto_ahash *mac; 255433d2f09fSMilan Broz 255533d2f09fSMilan Broz if (!strstarts(cipher_api, "authenc(")) 255633d2f09fSMilan Broz return 0; 255733d2f09fSMilan Broz 255833d2f09fSMilan Broz start = strchr(cipher_api, '('); 255933d2f09fSMilan Broz end = strchr(cipher_api, ','); 256033d2f09fSMilan Broz if (!start || !end || ++start > end) 256133d2f09fSMilan Broz return -EINVAL; 256233d2f09fSMilan Broz 256333d2f09fSMilan Broz mac_alg = kzalloc(end - start + 1, GFP_KERNEL); 256433d2f09fSMilan Broz if (!mac_alg) 256533d2f09fSMilan Broz return -ENOMEM; 256633d2f09fSMilan Broz strncpy(mac_alg, start, end - start); 256733d2f09fSMilan Broz 256833d2f09fSMilan Broz mac = crypto_alloc_ahash(mac_alg, 0, 0); 256933d2f09fSMilan Broz kfree(mac_alg); 257033d2f09fSMilan Broz 257133d2f09fSMilan Broz if (IS_ERR(mac)) 257233d2f09fSMilan Broz return PTR_ERR(mac); 257333d2f09fSMilan Broz 257433d2f09fSMilan Broz cc->key_mac_size = crypto_ahash_digestsize(mac); 257533d2f09fSMilan Broz crypto_free_ahash(mac); 257633d2f09fSMilan Broz 257733d2f09fSMilan Broz cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); 257833d2f09fSMilan Broz if (!cc->authenc_key) 257933d2f09fSMilan Broz return -ENOMEM; 258033d2f09fSMilan Broz 258133d2f09fSMilan Broz return 0; 258233d2f09fSMilan Broz } 258333d2f09fSMilan Broz 258433d2f09fSMilan Broz static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key, 258533d2f09fSMilan Broz char **ivmode, char **ivopts) 25861da177e4SLinus Torvalds { 25875ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 2588a1a262b6SArd Biesheuvel char *tmp, *cipher_api, buf[CRYPTO_MAX_ALG_NAME]; 258933d2f09fSMilan Broz int ret = -EINVAL; 259033d2f09fSMilan Broz 259133d2f09fSMilan Broz cc->tfms_count = 1; 259233d2f09fSMilan Broz 259333d2f09fSMilan Broz /* 259433d2f09fSMilan Broz * New format (capi: prefix) 259533d2f09fSMilan Broz * capi:cipher_api_spec-iv:ivopts 259633d2f09fSMilan Broz */ 259733d2f09fSMilan Broz tmp = &cipher_in[strlen("capi:")]; 25981856b9f7SMilan Broz 25991856b9f7SMilan Broz /* Separate IV options if present, it can contain another '-' in hash name */ 26001856b9f7SMilan Broz *ivopts = strrchr(tmp, ':'); 26011856b9f7SMilan Broz if (*ivopts) { 26021856b9f7SMilan Broz **ivopts = '\0'; 26031856b9f7SMilan Broz (*ivopts)++; 26041856b9f7SMilan Broz } 26051856b9f7SMilan Broz /* Parse IV mode */ 26061856b9f7SMilan Broz *ivmode = strrchr(tmp, '-'); 26071856b9f7SMilan Broz if (*ivmode) { 26081856b9f7SMilan Broz **ivmode = '\0'; 26091856b9f7SMilan Broz (*ivmode)++; 26101856b9f7SMilan Broz } 26111856b9f7SMilan Broz /* The rest is crypto API spec */ 26121856b9f7SMilan Broz cipher_api = tmp; 261333d2f09fSMilan Broz 2614a1a262b6SArd Biesheuvel /* Alloc AEAD, can be used only in new format. */ 2615a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) { 2616a1a262b6SArd Biesheuvel ret = crypt_ctr_auth_cipher(cc, cipher_api); 2617a1a262b6SArd Biesheuvel if (ret < 0) { 2618a1a262b6SArd Biesheuvel ti->error = "Invalid AEAD cipher spec"; 2619a1a262b6SArd Biesheuvel return -ENOMEM; 2620a1a262b6SArd Biesheuvel } 2621a1a262b6SArd Biesheuvel } 2622a1a262b6SArd Biesheuvel 262333d2f09fSMilan Broz if (*ivmode && !strcmp(*ivmode, "lmk")) 262433d2f09fSMilan Broz cc->tfms_count = 64; 262533d2f09fSMilan Broz 2626a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2627a1a262b6SArd Biesheuvel if (!*ivopts) { 2628a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2629a1a262b6SArd Biesheuvel return -EINVAL; 2630a1a262b6SArd Biesheuvel } 2631a1a262b6SArd Biesheuvel ret = snprintf(buf, CRYPTO_MAX_ALG_NAME, "essiv(%s,%s)", 2632a1a262b6SArd Biesheuvel cipher_api, *ivopts); 2633a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 2634a1a262b6SArd Biesheuvel ti->error = "Cannot allocate cipher string"; 2635a1a262b6SArd Biesheuvel return -ENOMEM; 2636a1a262b6SArd Biesheuvel } 2637a1a262b6SArd Biesheuvel cipher_api = buf; 2638a1a262b6SArd Biesheuvel } 2639a1a262b6SArd Biesheuvel 264033d2f09fSMilan Broz cc->key_parts = cc->tfms_count; 264133d2f09fSMilan Broz 264233d2f09fSMilan Broz /* Allocate cipher */ 264333d2f09fSMilan Broz ret = crypt_alloc_tfms(cc, cipher_api); 264433d2f09fSMilan Broz if (ret < 0) { 264533d2f09fSMilan Broz ti->error = "Error allocating crypto tfm"; 264633d2f09fSMilan Broz return ret; 264733d2f09fSMilan Broz } 264833d2f09fSMilan Broz 2649a1a262b6SArd Biesheuvel if (crypt_integrity_aead(cc)) 265033d2f09fSMilan Broz cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); 2651a1a262b6SArd Biesheuvel else 265233d2f09fSMilan Broz cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); 265333d2f09fSMilan Broz 265433d2f09fSMilan Broz return 0; 265533d2f09fSMilan Broz } 265633d2f09fSMilan Broz 265733d2f09fSMilan Broz static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key, 265833d2f09fSMilan Broz char **ivmode, char **ivopts) 265933d2f09fSMilan Broz { 266033d2f09fSMilan Broz struct crypt_config *cc = ti->private; 266133d2f09fSMilan Broz char *tmp, *cipher, *chainmode, *keycount; 26625ebaee6dSMilan Broz char *cipher_api = NULL; 26635ebaee6dSMilan Broz int ret = -EINVAL; 26645ebaee6dSMilan Broz char dummy; 26655ebaee6dSMilan Broz 266633d2f09fSMilan Broz if (strchr(cipher_in, '(') || crypt_integrity_aead(cc)) { 26675ebaee6dSMilan Broz ti->error = "Bad cipher specification"; 26685ebaee6dSMilan Broz return -EINVAL; 26695ebaee6dSMilan Broz } 26705ebaee6dSMilan Broz 26711da177e4SLinus Torvalds /* 26725ebaee6dSMilan Broz * Legacy dm-crypt cipher specification 26735ebaee6dSMilan Broz * cipher[:keycount]-mode-iv:ivopts 26745ebaee6dSMilan Broz */ 26755ebaee6dSMilan Broz tmp = cipher_in; 26765ebaee6dSMilan Broz keycount = strsep(&tmp, "-"); 26775ebaee6dSMilan Broz cipher = strsep(&keycount, ":"); 26785ebaee6dSMilan Broz 267969a8cfcdSMilan Broz if (!keycount) 26805ebaee6dSMilan Broz cc->tfms_count = 1; 26815ebaee6dSMilan Broz else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || 26825ebaee6dSMilan Broz !is_power_of_2(cc->tfms_count)) { 26835ebaee6dSMilan Broz ti->error = "Bad cipher key count specification"; 26845ebaee6dSMilan Broz return -EINVAL; 26855ebaee6dSMilan Broz } 268628513fccSMilan Broz cc->key_parts = cc->tfms_count; 26871da177e4SLinus Torvalds 2688ddd42edfSMilan Broz chainmode = strsep(&tmp, "-"); 26891856b9f7SMilan Broz *ivmode = strsep(&tmp, ":"); 26901856b9f7SMilan Broz *ivopts = tmp; 2691ddd42edfSMilan Broz 2692ddd42edfSMilan Broz /* 2693ddd42edfSMilan Broz * For compatibility with the original dm-crypt mapping format, if 2694ddd42edfSMilan Broz * only the cipher name is supplied, use cbc-plain. 269528513fccSMilan Broz */ 269633d2f09fSMilan Broz if (!chainmode || (!strcmp(chainmode, "plain") && !*ivmode)) { 2697cabf08e4SMilan Broz chainmode = "cbc"; 269833d2f09fSMilan Broz *ivmode = "plain"; 2699cabf08e4SMilan Broz } 2700cabf08e4SMilan Broz 270133d2f09fSMilan Broz if (strcmp(chainmode, "ecb") && !*ivmode) { 2702c0297721SAndi Kleen ti->error = "IV mechanism required"; 2703c0297721SAndi Kleen return -EINVAL; 2704c0297721SAndi Kleen } 2705c0297721SAndi Kleen 2706cabf08e4SMilan Broz cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); 27079934a8beSMilan Broz if (!cipher_api) 270828513fccSMilan Broz goto bad_mem; 27099934a8beSMilan Broz 2710a1a262b6SArd Biesheuvel if (*ivmode && !strcmp(*ivmode, "essiv")) { 2711a1a262b6SArd Biesheuvel if (!*ivopts) { 2712a1a262b6SArd Biesheuvel ti->error = "Digest algorithm missing for ESSIV mode"; 2713a1a262b6SArd Biesheuvel kfree(cipher_api); 2714a1a262b6SArd Biesheuvel return -EINVAL; 2715a1a262b6SArd Biesheuvel } 2716a1a262b6SArd Biesheuvel ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2717a1a262b6SArd Biesheuvel "essiv(%s(%s),%s)", chainmode, cipher, *ivopts); 2718a1a262b6SArd Biesheuvel } else { 27199934a8beSMilan Broz ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, 2720647c7db1SMikulas Patocka "%s(%s)", chainmode, cipher); 2721a1a262b6SArd Biesheuvel } 2722a1a262b6SArd Biesheuvel if (ret < 0 || ret >= CRYPTO_MAX_ALG_NAME) { 27231da177e4SLinus Torvalds kfree(cipher_api); 272428513fccSMilan Broz goto bad_mem; 272528513fccSMilan Broz } 272628513fccSMilan Broz 27271da177e4SLinus Torvalds /* Allocate cipher */ 27281da177e4SLinus Torvalds ret = crypt_alloc_tfms(cc, cipher_api); 27291da177e4SLinus Torvalds if (ret < 0) { 27301da177e4SLinus Torvalds ti->error = "Error allocating crypto tfm"; 273133d2f09fSMilan Broz kfree(cipher_api); 273233d2f09fSMilan Broz return ret; 2733028867acSAlasdair G Kergon } 2734bd86e320SJeffy Chen kfree(cipher_api); 2735647c7db1SMikulas Patocka 273633d2f09fSMilan Broz return 0; 273733d2f09fSMilan Broz bad_mem: 273833d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 273933d2f09fSMilan Broz return -ENOMEM; 274033d2f09fSMilan Broz } 274133d2f09fSMilan Broz 274233d2f09fSMilan Broz static int crypt_ctr_cipher(struct dm_target *ti, char *cipher_in, char *key) 274333d2f09fSMilan Broz { 274433d2f09fSMilan Broz struct crypt_config *cc = ti->private; 274533d2f09fSMilan Broz char *ivmode = NULL, *ivopts = NULL; 274633d2f09fSMilan Broz int ret; 274733d2f09fSMilan Broz 274833d2f09fSMilan Broz cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); 274933d2f09fSMilan Broz if (!cc->cipher_string) { 275033d2f09fSMilan Broz ti->error = "Cannot allocate cipher strings"; 275133d2f09fSMilan Broz return -ENOMEM; 275233d2f09fSMilan Broz } 275333d2f09fSMilan Broz 275433d2f09fSMilan Broz if (strstarts(cipher_in, "capi:")) 275533d2f09fSMilan Broz ret = crypt_ctr_cipher_new(ti, cipher_in, key, &ivmode, &ivopts); 275633d2f09fSMilan Broz else 275733d2f09fSMilan Broz ret = crypt_ctr_cipher_old(ti, cipher_in, key, &ivmode, &ivopts); 275833d2f09fSMilan Broz if (ret) 275933d2f09fSMilan Broz return ret; 276033d2f09fSMilan Broz 2761647c7db1SMikulas Patocka /* Initialize IV */ 2762e889f97aSMilan Broz ret = crypt_ctr_ivmode(ti, ivmode); 2763e889f97aSMilan Broz if (ret < 0) 276433d2f09fSMilan Broz return ret; 27651da177e4SLinus Torvalds 2766da31a078SMilan Broz /* Initialize and set key */ 2767da31a078SMilan Broz ret = crypt_set_key(cc, key); 2768da31a078SMilan Broz if (ret < 0) { 2769da31a078SMilan Broz ti->error = "Error decoding and setting key"; 277033d2f09fSMilan Broz return ret; 2771da31a078SMilan Broz } 2772da31a078SMilan Broz 27731da177e4SLinus Torvalds /* Allocate IV */ 27741da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { 27751da177e4SLinus Torvalds ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); 27761da177e4SLinus Torvalds if (ret < 0) { 27771da177e4SLinus Torvalds ti->error = "Error creating IV"; 277833d2f09fSMilan Broz return ret; 27791da177e4SLinus Torvalds } 27801da177e4SLinus Torvalds } 27811da177e4SLinus Torvalds 27821da177e4SLinus Torvalds /* Initialize IV (set keys for ESSIV etc) */ 27831da177e4SLinus Torvalds if (cc->iv_gen_ops && cc->iv_gen_ops->init) { 27841da177e4SLinus Torvalds ret = cc->iv_gen_ops->init(cc); 27851da177e4SLinus Torvalds if (ret < 0) { 27861da177e4SLinus Torvalds ti->error = "Error initialising IV"; 27871da177e4SLinus Torvalds return ret; 27881da177e4SLinus Torvalds } 27891da177e4SLinus Torvalds } 27901da177e4SLinus Torvalds 2791dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 2792dc94902bSOndrej Kozina if (cc->key_string) 2793dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 2794dc94902bSOndrej Kozina 279533d2f09fSMilan Broz return ret; 27961da177e4SLinus Torvalds } 27971da177e4SLinus Torvalds 2798ef43aa38SMilan Broz static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) 2799ef43aa38SMilan Broz { 2800ef43aa38SMilan Broz struct crypt_config *cc = ti->private; 2801ef43aa38SMilan Broz struct dm_arg_set as; 28025916a22bSEric Biggers static const struct dm_arg _args[] = { 28038f0009a2SMilan Broz {0, 6, "Invalid number of feature args"}, 2804ef43aa38SMilan Broz }; 2805ef43aa38SMilan Broz unsigned int opt_params, val; 2806ef43aa38SMilan Broz const char *opt_string, *sval; 28078f0009a2SMilan Broz char dummy; 2808ef43aa38SMilan Broz int ret; 2809ef43aa38SMilan Broz 2810ef43aa38SMilan Broz /* Optional parameters */ 2811ef43aa38SMilan Broz as.argc = argc; 2812ef43aa38SMilan Broz as.argv = argv; 2813ef43aa38SMilan Broz 2814ef43aa38SMilan Broz ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); 2815ef43aa38SMilan Broz if (ret) 28161da177e4SLinus Torvalds return ret; 28171da177e4SLinus Torvalds 2818ef43aa38SMilan Broz while (opt_params--) { 2819ef43aa38SMilan Broz opt_string = dm_shift_arg(&as); 2820ef43aa38SMilan Broz if (!opt_string) { 2821ef43aa38SMilan Broz ti->error = "Not enough feature arguments"; 2822ef43aa38SMilan Broz return -EINVAL; 2823ef43aa38SMilan Broz } 2824ef43aa38SMilan Broz 2825ef43aa38SMilan Broz if (!strcasecmp(opt_string, "allow_discards")) 2826ef43aa38SMilan Broz ti->num_discard_bios = 1; 2827ef43aa38SMilan Broz 2828ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "same_cpu_crypt")) 2829ef43aa38SMilan Broz set_bit(DM_CRYPT_SAME_CPU, &cc->flags); 2830ef43aa38SMilan Broz 2831ef43aa38SMilan Broz else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) 2832ef43aa38SMilan Broz set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 2833ef43aa38SMilan Broz else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { 2834ef43aa38SMilan Broz if (val == 0 || val > MAX_TAG_SIZE) { 2835ef43aa38SMilan Broz ti->error = "Invalid integrity arguments"; 2836ef43aa38SMilan Broz return -EINVAL; 2837ef43aa38SMilan Broz } 2838ef43aa38SMilan Broz cc->on_disk_tag_size = val; 2839ef43aa38SMilan Broz sval = strchr(opt_string + strlen("integrity:"), ':') + 1; 2840ef43aa38SMilan Broz if (!strcasecmp(sval, "aead")) { 2841ef43aa38SMilan Broz set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); 2842ef43aa38SMilan Broz } else if (strcasecmp(sval, "none")) { 2843ef43aa38SMilan Broz ti->error = "Unknown integrity profile"; 2844ef43aa38SMilan Broz return -EINVAL; 2845ef43aa38SMilan Broz } 2846ef43aa38SMilan Broz 2847ef43aa38SMilan Broz cc->cipher_auth = kstrdup(sval, GFP_KERNEL); 2848ef43aa38SMilan Broz if (!cc->cipher_auth) 28491da177e4SLinus Torvalds return -ENOMEM; 2850ff3af92bSMikulas Patocka } else if (sscanf(opt_string, "sector_size:%hu%c", &cc->sector_size, &dummy) == 1) { 28518f0009a2SMilan Broz if (cc->sector_size < (1 << SECTOR_SHIFT) || 28528f0009a2SMilan Broz cc->sector_size > 4096 || 2853ff3af92bSMikulas Patocka (cc->sector_size & (cc->sector_size - 1))) { 28548f0009a2SMilan Broz ti->error = "Invalid feature value for sector_size"; 28558f0009a2SMilan Broz return -EINVAL; 28568f0009a2SMilan Broz } 2857783874b0SMilan Broz if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { 2858783874b0SMilan Broz ti->error = "Device size is not multiple of sector_size feature"; 2859783874b0SMilan Broz return -EINVAL; 2860783874b0SMilan Broz } 2861ff3af92bSMikulas Patocka cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; 28628f0009a2SMilan Broz } else if (!strcasecmp(opt_string, "iv_large_sectors")) 28638f0009a2SMilan Broz set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 28648f0009a2SMilan Broz else { 2865ef43aa38SMilan Broz ti->error = "Invalid feature arguments"; 2866ef43aa38SMilan Broz return -EINVAL; 2867ef43aa38SMilan Broz } 2868ef43aa38SMilan Broz } 2869ef43aa38SMilan Broz 2870ef43aa38SMilan Broz return 0; 28711da177e4SLinus Torvalds } 28721da177e4SLinus Torvalds 28731da177e4SLinus Torvalds /* 28741da177e4SLinus Torvalds * Construct an encryption mapping: 2875c538f6ecSOndrej Kozina * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> 28761da177e4SLinus Torvalds */ 28771da177e4SLinus Torvalds static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) 28781da177e4SLinus Torvalds { 28791da177e4SLinus Torvalds struct crypt_config *cc; 2880ed0302e8SMichał Mirosław const char *devname = dm_table_device_name(ti->table); 2881c538f6ecSOndrej Kozina int key_size; 2882ef43aa38SMilan Broz unsigned int align_mask; 28831da177e4SLinus Torvalds unsigned long long tmpll; 28841da177e4SLinus Torvalds int ret; 2885ef43aa38SMilan Broz size_t iv_size_padding, additional_req_size; 288631998ef1SMikulas Patocka char dummy; 28871da177e4SLinus Torvalds 2888772ae5f5SMilan Broz if (argc < 5) { 28891da177e4SLinus Torvalds ti->error = "Not enough arguments"; 28901da177e4SLinus Torvalds return -EINVAL; 28911da177e4SLinus Torvalds } 28921da177e4SLinus Torvalds 2893c538f6ecSOndrej Kozina key_size = get_key_size(&argv[1]); 2894c538f6ecSOndrej Kozina if (key_size < 0) { 2895c538f6ecSOndrej Kozina ti->error = "Cannot parse key size"; 2896c538f6ecSOndrej Kozina return -EINVAL; 2897c538f6ecSOndrej Kozina } 28981da177e4SLinus Torvalds 28999c81c99bSZhengyuan Liu cc = kzalloc(struct_size(cc, key, key_size), GFP_KERNEL); 29001da177e4SLinus Torvalds if (!cc) { 29011da177e4SLinus Torvalds ti->error = "Cannot allocate encryption context"; 29021da177e4SLinus Torvalds return -ENOMEM; 29031da177e4SLinus Torvalds } 29041da177e4SLinus Torvalds cc->key_size = key_size; 29058f0009a2SMilan Broz cc->sector_size = (1 << SECTOR_SHIFT); 2906ff3af92bSMikulas Patocka cc->sector_shift = 0; 29071da177e4SLinus Torvalds 29081da177e4SLinus Torvalds ti->private = cc; 2909ef43aa38SMilan Broz 29105059353dSMikulas Patocka spin_lock(&dm_crypt_clients_lock); 29115059353dSMikulas Patocka dm_crypt_clients_n++; 29125059353dSMikulas Patocka crypt_calculate_pages_per_client(); 29135059353dSMikulas Patocka spin_unlock(&dm_crypt_clients_lock); 29145059353dSMikulas Patocka 29155059353dSMikulas Patocka ret = percpu_counter_init(&cc->n_allocated_pages, 0, GFP_KERNEL); 29165059353dSMikulas Patocka if (ret < 0) 29175059353dSMikulas Patocka goto bad; 29185059353dSMikulas Patocka 2919ef43aa38SMilan Broz /* Optional parameters need to be read before cipher constructor */ 2920ef43aa38SMilan Broz if (argc > 5) { 2921ef43aa38SMilan Broz ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); 2922ef43aa38SMilan Broz if (ret) 2923ef43aa38SMilan Broz goto bad; 2924ef43aa38SMilan Broz } 2925ef43aa38SMilan Broz 29261da177e4SLinus Torvalds ret = crypt_ctr_cipher(ti, argv[0], argv[1]); 29271da177e4SLinus Torvalds if (ret < 0) 29281da177e4SLinus Torvalds goto bad; 29291da177e4SLinus Torvalds 293033d2f09fSMilan Broz if (crypt_integrity_aead(cc)) { 2931ef43aa38SMilan Broz cc->dmreq_start = sizeof(struct aead_request); 2932ef43aa38SMilan Broz cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); 2933ef43aa38SMilan Broz align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); 2934ef43aa38SMilan Broz } else { 2935bbdb23b5SHerbert Xu cc->dmreq_start = sizeof(struct skcipher_request); 2936bbdb23b5SHerbert Xu cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); 2937ef43aa38SMilan Broz align_mask = crypto_skcipher_alignmask(any_tfm(cc)); 2938ef43aa38SMilan Broz } 2939d49ec52fSMikulas Patocka cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); 2940d49ec52fSMikulas Patocka 2941ef43aa38SMilan Broz if (align_mask < CRYPTO_MINALIGN) { 2942d49ec52fSMikulas Patocka /* Allocate the padding exactly */ 2943d49ec52fSMikulas Patocka iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) 2944ef43aa38SMilan Broz & align_mask; 2945d49ec52fSMikulas Patocka } else { 2946d49ec52fSMikulas Patocka /* 2947d49ec52fSMikulas Patocka * If the cipher requires greater alignment than kmalloc 2948d49ec52fSMikulas Patocka * alignment, we don't know the exact position of the 2949d49ec52fSMikulas Patocka * initialization vector. We must assume worst case. 2950d49ec52fSMikulas Patocka */ 2951ef43aa38SMilan Broz iv_size_padding = align_mask; 2952d49ec52fSMikulas Patocka } 29531da177e4SLinus Torvalds 2954ef43aa38SMilan Broz /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ 2955ef43aa38SMilan Broz additional_req_size = sizeof(struct dm_crypt_request) + 2956ef43aa38SMilan Broz iv_size_padding + cc->iv_size + 2957ef43aa38SMilan Broz cc->iv_size + 2958ef43aa38SMilan Broz sizeof(uint64_t) + 2959ef43aa38SMilan Broz sizeof(unsigned int); 2960ef43aa38SMilan Broz 29616f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->req_pool, MIN_IOS, cc->dmreq_start + additional_req_size); 29626f1c819cSKent Overstreet if (ret) { 29631da177e4SLinus Torvalds ti->error = "Cannot allocate crypt request mempool"; 29641da177e4SLinus Torvalds goto bad; 29651da177e4SLinus Torvalds } 29661da177e4SLinus Torvalds 296730187e1dSMike Snitzer cc->per_bio_data_size = ti->per_io_data_size = 2968ef43aa38SMilan Broz ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, 2969d49ec52fSMikulas Patocka ARCH_KMALLOC_MINALIGN); 2970298a9fa0SMikulas Patocka 29716f1c819cSKent Overstreet ret = mempool_init(&cc->page_pool, BIO_MAX_PAGES, crypt_page_alloc, crypt_page_free, cc); 29726f1c819cSKent Overstreet if (ret) { 29738b004457SMilan Broz ti->error = "Cannot allocate page mempool"; 2974e48d4bbfSMilan Broz goto bad; 29751da177e4SLinus Torvalds } 2976e48d4bbfSMilan Broz 29776f1c819cSKent Overstreet ret = bioset_init(&cc->bs, MIN_IOS, 0, BIOSET_NEED_BVECS); 29786f1c819cSKent Overstreet if (ret) { 29790c395b0fSMilan Broz ti->error = "Cannot allocate crypt bioset"; 2980cabf08e4SMilan Broz goto bad; 298193e605c2SMilan Broz } 2982cabf08e4SMilan Broz 29837145c241SMikulas Patocka mutex_init(&cc->bio_alloc_lock); 29847145c241SMikulas Patocka 2985cabf08e4SMilan Broz ret = -EINVAL; 29868f0009a2SMilan Broz if ((sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) || 29878f0009a2SMilan Broz (tmpll & ((cc->sector_size >> SECTOR_SHIFT) - 1))) { 2988cabf08e4SMilan Broz ti->error = "Invalid iv_offset sector"; 2989cabf08e4SMilan Broz goto bad; 29901da177e4SLinus Torvalds } 2991d2a7ad29SKiyoshi Ueda cc->iv_offset = tmpll; 29921da177e4SLinus Torvalds 2993e80d1c80SVivek Goyal ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev); 2994e80d1c80SVivek Goyal if (ret) { 29951da177e4SLinus Torvalds ti->error = "Device lookup failed"; 29961da177e4SLinus Torvalds goto bad; 29971da177e4SLinus Torvalds } 29981da177e4SLinus Torvalds 2999e80d1c80SVivek Goyal ret = -EINVAL; 3000ef87bfc2SMilan Broz if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) { 30011da177e4SLinus Torvalds ti->error = "Invalid device sector"; 30021da177e4SLinus Torvalds goto bad; 30031da177e4SLinus Torvalds } 30041da177e4SLinus Torvalds cc->start = tmpll; 30051da177e4SLinus Torvalds 300633d2f09fSMilan Broz if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { 3007ef43aa38SMilan Broz ret = crypt_integrity_ctr(cc, ti); 3008772ae5f5SMilan Broz if (ret) 3009772ae5f5SMilan Broz goto bad; 3010772ae5f5SMilan Broz 3011ef43aa38SMilan Broz cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; 3012ef43aa38SMilan Broz if (!cc->tag_pool_max_sectors) 3013ef43aa38SMilan Broz cc->tag_pool_max_sectors = 1; 3014ef43aa38SMilan Broz 30156f1c819cSKent Overstreet ret = mempool_init_kmalloc_pool(&cc->tag_pool, MIN_IOS, 3016ef43aa38SMilan Broz cc->tag_pool_max_sectors * cc->on_disk_tag_size); 30176f1c819cSKent Overstreet if (ret) { 3018ef43aa38SMilan Broz ti->error = "Cannot allocate integrity tags mempool"; 3019f3396c58SMikulas Patocka goto bad; 3020f3396c58SMikulas Patocka } 3021772ae5f5SMilan Broz 3022583fe747SMikulas Patocka cc->tag_pool_max_sectors <<= cc->sector_shift; 3023f3396c58SMikulas Patocka } 3024772ae5f5SMilan Broz 30251da177e4SLinus Torvalds ret = -ENOMEM; 3026f612b213SMike Snitzer cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname); 30271da177e4SLinus Torvalds if (!cc->io_queue) { 30281da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd io queue"; 30291da177e4SLinus Torvalds goto bad; 30301da177e4SLinus Torvalds } 303137af6560SChristophe Saout 3032f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3033f612b213SMike Snitzer cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 3034ed0302e8SMichał Mirosław 1, devname); 3035f3396c58SMikulas Patocka else 3036ed0302e8SMichał Mirosław cc->crypt_queue = alloc_workqueue("kcryptd/%s", 3037f612b213SMike Snitzer WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, 3038ed0302e8SMichał Mirosław num_online_cpus(), devname); 30391da177e4SLinus Torvalds if (!cc->crypt_queue) { 30401da177e4SLinus Torvalds ti->error = "Couldn't create kcryptd queue"; 30411da177e4SLinus Torvalds goto bad; 30421da177e4SLinus Torvalds } 30431da177e4SLinus Torvalds 3044c7329effSMikulas Patocka spin_lock_init(&cc->write_thread_lock); 3045b3c5fd30SMikulas Patocka cc->write_tree = RB_ROOT; 3046dc267621SMikulas Patocka 3047ed0302e8SMichał Mirosław cc->write_thread = kthread_create(dmcrypt_write, cc, "dmcrypt_write/%s", devname); 3048dc267621SMikulas Patocka if (IS_ERR(cc->write_thread)) { 3049dc267621SMikulas Patocka ret = PTR_ERR(cc->write_thread); 3050dc267621SMikulas Patocka cc->write_thread = NULL; 3051dc267621SMikulas Patocka ti->error = "Couldn't spawn write thread"; 3052dc267621SMikulas Patocka goto bad; 3053dc267621SMikulas Patocka } 3054dc267621SMikulas Patocka wake_up_process(cc->write_thread); 3055dc267621SMikulas Patocka 305655a62eefSAlasdair G Kergon ti->num_flush_bios = 1; 3057983c7db3SMilan Broz 30581da177e4SLinus Torvalds return 0; 30591da177e4SLinus Torvalds 30601da177e4SLinus Torvalds bad: 30611da177e4SLinus Torvalds crypt_dtr(ti); 30621da177e4SLinus Torvalds return ret; 3063647c7db1SMikulas Patocka } 3064647c7db1SMikulas Patocka 30657de3ee57SMikulas Patocka static int crypt_map(struct dm_target *ti, struct bio *bio) 30661da177e4SLinus Torvalds { 30671da177e4SLinus Torvalds struct dm_crypt_io *io; 306849a8a920SAlasdair G Kergon struct crypt_config *cc = ti->private; 3069647c7db1SMikulas Patocka 3070772ae5f5SMilan Broz /* 307128a8f0d3SMike Christie * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. 307228a8f0d3SMike Christie * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight 3073e6047149SMike Christie * - for REQ_OP_DISCARD caller must use flush if IO ordering matters 3074772ae5f5SMilan Broz */ 30751eff9d32SJens Axboe if (unlikely(bio->bi_opf & REQ_PREFLUSH || 307628a8f0d3SMike Christie bio_op(bio) == REQ_OP_DISCARD)) { 307774d46992SChristoph Hellwig bio_set_dev(bio, cc->dev->bdev); 3078772ae5f5SMilan Broz if (bio_sectors(bio)) 30794f024f37SKent Overstreet bio->bi_iter.bi_sector = cc->start + 30804f024f37SKent Overstreet dm_target_offset(ti, bio->bi_iter.bi_sector); 3081647c7db1SMikulas Patocka return DM_MAPIO_REMAPPED; 3082647c7db1SMikulas Patocka } 30831da177e4SLinus Torvalds 30844e870e94SMikulas Patocka /* 30854e870e94SMikulas Patocka * Check if bio is too large, split as needed. 30864e870e94SMikulas Patocka */ 30874e870e94SMikulas Patocka if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && 3088ef43aa38SMilan Broz (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) 30894e870e94SMikulas Patocka dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); 30904e870e94SMikulas Patocka 30918f0009a2SMilan Broz /* 30928f0009a2SMilan Broz * Ensure that bio is a multiple of internal sector encryption size 30938f0009a2SMilan Broz * and is aligned to this size as defined in IO hints. 30948f0009a2SMilan Broz */ 30958f0009a2SMilan Broz if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0)) 3096846785e6SChristoph Hellwig return DM_MAPIO_KILL; 30978f0009a2SMilan Broz 30988f0009a2SMilan Broz if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1))) 3099846785e6SChristoph Hellwig return DM_MAPIO_KILL; 31008f0009a2SMilan Broz 3101298a9fa0SMikulas Patocka io = dm_per_bio_data(bio, cc->per_bio_data_size); 3102298a9fa0SMikulas Patocka crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); 3103ef43aa38SMilan Broz 3104ef43aa38SMilan Broz if (cc->on_disk_tag_size) { 3105583fe747SMikulas Patocka unsigned tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift); 3106ef43aa38SMilan Broz 3107ef43aa38SMilan Broz if (unlikely(tag_len > KMALLOC_MAX_SIZE) || 3108583fe747SMikulas Patocka unlikely(!(io->integrity_metadata = kmalloc(tag_len, 3109ef43aa38SMilan Broz GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { 3110ef43aa38SMilan Broz if (bio_sectors(bio) > cc->tag_pool_max_sectors) 3111ef43aa38SMilan Broz dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); 31126f1c819cSKent Overstreet io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO); 3113ef43aa38SMilan Broz io->integrity_metadata_from_pool = true; 3114ef43aa38SMilan Broz } 3115ef43aa38SMilan Broz } 3116ef43aa38SMilan Broz 311733d2f09fSMilan Broz if (crypt_integrity_aead(cc)) 3118ef43aa38SMilan Broz io->ctx.r.req_aead = (struct aead_request *)(io + 1); 3119ef43aa38SMilan Broz else 3120ef43aa38SMilan Broz io->ctx.r.req = (struct skcipher_request *)(io + 1); 31211da177e4SLinus Torvalds 312220c82538SMilan Broz if (bio_data_dir(io->base_bio) == READ) { 312320c82538SMilan Broz if (kcryptd_io_read(io, GFP_NOWAIT)) 3124dc267621SMikulas Patocka kcryptd_queue_read(io); 312520c82538SMilan Broz } else 31264ee218cdSAndrew Morton kcryptd_queue_crypt(io); 31274ee218cdSAndrew Morton 31281da177e4SLinus Torvalds return DM_MAPIO_SUBMITTED; 31291da177e4SLinus Torvalds } 31301da177e4SLinus Torvalds 3131fd7c092eSMikulas Patocka static void crypt_status(struct dm_target *ti, status_type_t type, 31321f4e0ff0SAlasdair G Kergon unsigned status_flags, char *result, unsigned maxlen) 31331da177e4SLinus Torvalds { 31345ebaee6dSMilan Broz struct crypt_config *cc = ti->private; 3135fd7c092eSMikulas Patocka unsigned i, sz = 0; 3136f3396c58SMikulas Patocka int num_feature_args = 0; 31371da177e4SLinus Torvalds 31381da177e4SLinus Torvalds switch (type) { 31391da177e4SLinus Torvalds case STATUSTYPE_INFO: 31401da177e4SLinus Torvalds result[0] = '\0'; 31411da177e4SLinus Torvalds break; 31421da177e4SLinus Torvalds 31431da177e4SLinus Torvalds case STATUSTYPE_TABLE: 31447dbcd137SMilan Broz DMEMIT("%s ", cc->cipher_string); 31451da177e4SLinus Torvalds 3146c538f6ecSOndrej Kozina if (cc->key_size > 0) { 3147c538f6ecSOndrej Kozina if (cc->key_string) 3148c538f6ecSOndrej Kozina DMEMIT(":%u:%s", cc->key_size, cc->key_string); 3149c538f6ecSOndrej Kozina else 3150fd7c092eSMikulas Patocka for (i = 0; i < cc->key_size; i++) 3151fd7c092eSMikulas Patocka DMEMIT("%02x", cc->key[i]); 3152c538f6ecSOndrej Kozina } else 3153fd7c092eSMikulas Patocka DMEMIT("-"); 31541da177e4SLinus Torvalds 31551da177e4SLinus Torvalds DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, 31561da177e4SLinus Torvalds cc->dev->name, (unsigned long long)cc->start); 3157772ae5f5SMilan Broz 3158f3396c58SMikulas Patocka num_feature_args += !!ti->num_discard_bios; 3159f3396c58SMikulas Patocka num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); 31600f5d8e6eSMikulas Patocka num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); 3161ff3af92bSMikulas Patocka num_feature_args += cc->sector_size != (1 << SECTOR_SHIFT); 31628f0009a2SMilan Broz num_feature_args += test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); 3163ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3164ef43aa38SMilan Broz num_feature_args++; 3165f3396c58SMikulas Patocka if (num_feature_args) { 3166f3396c58SMikulas Patocka DMEMIT(" %d", num_feature_args); 316755a62eefSAlasdair G Kergon if (ti->num_discard_bios) 3168f3396c58SMikulas Patocka DMEMIT(" allow_discards"); 3169f3396c58SMikulas Patocka if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 3170f3396c58SMikulas Patocka DMEMIT(" same_cpu_crypt"); 31710f5d8e6eSMikulas Patocka if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) 31720f5d8e6eSMikulas Patocka DMEMIT(" submit_from_crypt_cpus"); 3173ef43aa38SMilan Broz if (cc->on_disk_tag_size) 3174ef43aa38SMilan Broz DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); 31758f0009a2SMilan Broz if (cc->sector_size != (1 << SECTOR_SHIFT)) 31768f0009a2SMilan Broz DMEMIT(" sector_size:%d", cc->sector_size); 31778f0009a2SMilan Broz if (test_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags)) 31788f0009a2SMilan Broz DMEMIT(" iv_large_sectors"); 3179f3396c58SMikulas Patocka } 3180772ae5f5SMilan Broz 31811da177e4SLinus Torvalds break; 31821da177e4SLinus Torvalds } 31831da177e4SLinus Torvalds } 31841da177e4SLinus Torvalds 3185e48d4bbfSMilan Broz static void crypt_postsuspend(struct dm_target *ti) 3186e48d4bbfSMilan Broz { 3187e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3188e48d4bbfSMilan Broz 3189e48d4bbfSMilan Broz set_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3190e48d4bbfSMilan Broz } 3191e48d4bbfSMilan Broz 3192e48d4bbfSMilan Broz static int crypt_preresume(struct dm_target *ti) 3193e48d4bbfSMilan Broz { 3194e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3195e48d4bbfSMilan Broz 3196e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { 3197e48d4bbfSMilan Broz DMERR("aborting resume - crypt key is not set."); 3198e48d4bbfSMilan Broz return -EAGAIN; 3199e48d4bbfSMilan Broz } 3200e48d4bbfSMilan Broz 3201e48d4bbfSMilan Broz return 0; 3202e48d4bbfSMilan Broz } 3203e48d4bbfSMilan Broz 3204e48d4bbfSMilan Broz static void crypt_resume(struct dm_target *ti) 3205e48d4bbfSMilan Broz { 3206e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3207e48d4bbfSMilan Broz 3208e48d4bbfSMilan Broz clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); 3209e48d4bbfSMilan Broz } 3210e48d4bbfSMilan Broz 3211e48d4bbfSMilan Broz /* Message interface 3212e48d4bbfSMilan Broz * key set <key> 3213e48d4bbfSMilan Broz * key wipe 3214e48d4bbfSMilan Broz */ 32151eb5fa84SMike Snitzer static int crypt_message(struct dm_target *ti, unsigned argc, char **argv, 32161eb5fa84SMike Snitzer char *result, unsigned maxlen) 3217e48d4bbfSMilan Broz { 3218e48d4bbfSMilan Broz struct crypt_config *cc = ti->private; 3219c538f6ecSOndrej Kozina int key_size, ret = -EINVAL; 3220e48d4bbfSMilan Broz 3221e48d4bbfSMilan Broz if (argc < 2) 3222e48d4bbfSMilan Broz goto error; 3223e48d4bbfSMilan Broz 3224498f0103SMike Snitzer if (!strcasecmp(argv[0], "key")) { 3225e48d4bbfSMilan Broz if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { 3226e48d4bbfSMilan Broz DMWARN("not suspended during key manipulation."); 3227e48d4bbfSMilan Broz return -EINVAL; 3228e48d4bbfSMilan Broz } 3229498f0103SMike Snitzer if (argc == 3 && !strcasecmp(argv[1], "set")) { 3230c538f6ecSOndrej Kozina /* The key size may not be changed. */ 3231c538f6ecSOndrej Kozina key_size = get_key_size(&argv[2]); 3232c538f6ecSOndrej Kozina if (key_size < 0 || cc->key_size != key_size) { 3233c538f6ecSOndrej Kozina memset(argv[2], '0', strlen(argv[2])); 3234c538f6ecSOndrej Kozina return -EINVAL; 3235c538f6ecSOndrej Kozina } 3236c538f6ecSOndrej Kozina 3237542da317SMilan Broz ret = crypt_set_key(cc, argv[2]); 3238542da317SMilan Broz if (ret) 3239542da317SMilan Broz return ret; 3240542da317SMilan Broz if (cc->iv_gen_ops && cc->iv_gen_ops->init) 3241542da317SMilan Broz ret = cc->iv_gen_ops->init(cc); 3242dc94902bSOndrej Kozina /* wipe the kernel key payload copy */ 3243dc94902bSOndrej Kozina if (cc->key_string) 3244dc94902bSOndrej Kozina memset(cc->key, 0, cc->key_size * sizeof(u8)); 3245542da317SMilan Broz return ret; 3246542da317SMilan Broz } 32474a52ffc7SMilan Broz if (argc == 2 && !strcasecmp(argv[1], "wipe")) 3248e48d4bbfSMilan Broz return crypt_wipe_key(cc); 3249e48d4bbfSMilan Broz } 3250e48d4bbfSMilan Broz 3251e48d4bbfSMilan Broz error: 3252e48d4bbfSMilan Broz DMWARN("unrecognised message received."); 3253e48d4bbfSMilan Broz return -EINVAL; 3254e48d4bbfSMilan Broz } 3255e48d4bbfSMilan Broz 3256af4874e0SMike Snitzer static int crypt_iterate_devices(struct dm_target *ti, 3257af4874e0SMike Snitzer iterate_devices_callout_fn fn, void *data) 3258af4874e0SMike Snitzer { 3259af4874e0SMike Snitzer struct crypt_config *cc = ti->private; 3260af4874e0SMike Snitzer 32615dea271bSMike Snitzer return fn(ti, cc->dev, cc->start, ti->len, data); 3262af4874e0SMike Snitzer } 3263af4874e0SMike Snitzer 3264586b286bSMike Snitzer static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) 3265586b286bSMike Snitzer { 32668f0009a2SMilan Broz struct crypt_config *cc = ti->private; 32678f0009a2SMilan Broz 3268586b286bSMike Snitzer /* 3269586b286bSMike Snitzer * Unfortunate constraint that is required to avoid the potential 3270586b286bSMike Snitzer * for exceeding underlying device's max_segments limits -- due to 3271586b286bSMike Snitzer * crypt_alloc_buffer() possibly allocating pages for the encryption 3272586b286bSMike Snitzer * bio that are not as physically contiguous as the original bio. 3273586b286bSMike Snitzer */ 3274586b286bSMike Snitzer limits->max_segment_size = PAGE_SIZE; 32758f0009a2SMilan Broz 3276bc9e9cf0SMikulas Patocka limits->logical_block_size = 3277bc9e9cf0SMikulas Patocka max_t(unsigned short, limits->logical_block_size, cc->sector_size); 3278bc9e9cf0SMikulas Patocka limits->physical_block_size = 3279bc9e9cf0SMikulas Patocka max_t(unsigned, limits->physical_block_size, cc->sector_size); 3280bc9e9cf0SMikulas Patocka limits->io_min = max_t(unsigned, limits->io_min, cc->sector_size); 3281586b286bSMike Snitzer } 3282586b286bSMike Snitzer 32831da177e4SLinus Torvalds static struct target_type crypt_target = { 32841da177e4SLinus Torvalds .name = "crypt", 3285bbb16584SMilan Broz .version = {1, 20, 0}, 32861da177e4SLinus Torvalds .module = THIS_MODULE, 32871da177e4SLinus Torvalds .ctr = crypt_ctr, 32881da177e4SLinus Torvalds .dtr = crypt_dtr, 32891da177e4SLinus Torvalds .map = crypt_map, 32901da177e4SLinus Torvalds .status = crypt_status, 3291e48d4bbfSMilan Broz .postsuspend = crypt_postsuspend, 3292e48d4bbfSMilan Broz .preresume = crypt_preresume, 3293e48d4bbfSMilan Broz .resume = crypt_resume, 3294e48d4bbfSMilan Broz .message = crypt_message, 3295af4874e0SMike Snitzer .iterate_devices = crypt_iterate_devices, 3296586b286bSMike Snitzer .io_hints = crypt_io_hints, 32971da177e4SLinus Torvalds }; 32981da177e4SLinus Torvalds 32991da177e4SLinus Torvalds static int __init dm_crypt_init(void) 33001da177e4SLinus Torvalds { 33011da177e4SLinus Torvalds int r; 33021da177e4SLinus Torvalds 33031da177e4SLinus Torvalds r = dm_register_target(&crypt_target); 330494f5e024SMikulas Patocka if (r < 0) 330572d94861SAlasdair G Kergon DMERR("register failed %d", r); 33061da177e4SLinus Torvalds 33071da177e4SLinus Torvalds return r; 33081da177e4SLinus Torvalds } 33091da177e4SLinus Torvalds 33101da177e4SLinus Torvalds static void __exit dm_crypt_exit(void) 33111da177e4SLinus Torvalds { 331210d3bd09SMikulas Patocka dm_unregister_target(&crypt_target); 33131da177e4SLinus Torvalds } 33141da177e4SLinus Torvalds 33151da177e4SLinus Torvalds module_init(dm_crypt_init); 33161da177e4SLinus Torvalds module_exit(dm_crypt_exit); 33171da177e4SLinus Torvalds 3318bf14299fSJana Saout MODULE_AUTHOR("Jana Saout <jana@saout.de>"); 33191da177e4SLinus Torvalds MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); 33201da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 3321