sys/dev/disk/dm/targets/crypt/dm_target_crypt.c

   1 /*
   2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Alex Hornung <ahornung@gmail.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * This file implements initial version of device-mapper crypt target.
  37  */
  38 #include <sys/types.h>
  39 #include <sys/endian.h>
  40
  41 #include <sys/bio.h>
  42 #include <sys/buf.h>
  43 #include <sys/globaldata.h>
  44 #include <sys/kerneldump.h>
  45 #include <sys/malloc.h>
  46 #include <sys/mpipe.h>
  47 #include <sys/md5.h>
  48 #include <sys/mutex2.h>
  49 #include <sys/vnode.h>
  50 #include <crypto/sha1.h>
  51 #include <crypto/sha2/sha2.h>
  52 #include <opencrypto/cryptodev.h>
  53 #include <opencrypto/rmd160.h>
  54 #include <machine/cpufunc.h>
  55
  56 #include <sys/ktr.h>
  57
  58 #include <dev/disk/dm/dm.h>
  59 MALLOC_DEFINE(M_DMCRYPT, "dm_crypt", "Device Mapper Target Crypt");
  60
  61 KTR_INFO_MASTER(dmcrypt);
  62
  63 #if !defined(KTR_DMCRYPT)
  64 #define KTR_DMCRYPT     KTR_ALL
  65 #endif
  66
  67 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_dispatch, 0,
  68     "crypto_dispatch(%p)", struct cryptop *crp);
  69 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypt_strategy, 0,
  70     "crypt_strategy(b_cmd = %d, bp = %p)", int cmd, struct buf *bp);
  71 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_write_start, 1,
  72     "crypto_write_start(crp = %p, bp = %p, sector = %d/%d)",
  73     struct cryptop *crp, struct buf *bp, int i, int sectors);
  74 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_cb_write_done, 1,
  75     "crypto_cb_write_done(crp = %p, bp = %p, n = %d)",
  76     struct cryptop *crp, struct buf *bp, int n);
  77 KTR_INFO(KTR_DMCRYPT, dmcrypt, bio_write_done, 1,
  78     "bio_write_done(bp = %p)", struct buf *bp);
  79 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_write_retry, 1,
  80     "crypto_write_retry(crp = %p)", struct buf *bp);
  81 KTR_INFO(KTR_DMCRYPT, dmcrypt, bio_read_done, 2,
  82     "bio_read_done(bp = %p)", struct buf *bp);
  83 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_read_start, 2,
  84     "crypto_read_start(crp = %p, bp = %p, sector = %d/%d)",
  85     struct cryptop *crp, struct buf *bp, int i, int sectors);
  86 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_cb_read_done, 2,
  87     "crypto_cb_read_done(crp = %p, bp = %p, n = %d)",
  88     struct cryptop *crp, struct buf *bp, int n);
  89
  90 struct target_crypt_config;
  91
  92 typedef void dispatch_t(void *);
  93 typedef void ivgen_t(struct target_crypt_config *, u_int8_t *, size_t, off_t,
  94     void *);
  95
  96 typedef int ivgen_ctor_t(struct target_crypt_config *, char *, void **);
  97 typedef int ivgen_dtor_t(struct target_crypt_config *, void *);
  98
  99 struct iv_generator {
 100         const char      *name;
 101         ivgen_ctor_t    *ctor;
 102         ivgen_dtor_t    *dtor;
 103         ivgen_t         *gen_iv;
 104 };
 105
 106 struct essiv_ivgen_priv {
 107         struct cryptoini        crypto_session;
 108         struct objcache *crp_crd_cache;
 109         u_int64_t       crypto_sid;
 110         size_t          keyhash_len;
 111         u_int8_t        crypto_keyhash[SHA512_DIGEST_LENGTH];
 112 };
 113
 114 typedef struct target_crypt_config {
 115         size_t  params_len;
 116         dm_pdev_t *pdev;
 117         char    *status_str;
 118         int     crypto_alg;
 119         int     crypto_klen;
 120         u_int8_t        crypto_key[512>>3];
 121
 122         u_int64_t       crypto_sid;
 123         u_int64_t       block_offset;
 124         int64_t         iv_offset;
 125         SHA512_CTX      essivsha512_ctx;
 126
 127         struct cryptoini        crypto_session;
 128
 129         struct iv_generator     *ivgen;
 130         void    *ivgen_priv;
 131
 132         struct malloc_pipe      read_mpipe;
 133         struct malloc_pipe      write_mpipe;
 134 } dm_target_crypt_config_t;
 135
 136 struct dmtc_helper {
 137         dm_target_crypt_config_t *priv;
 138         caddr_t free_addr;
 139         caddr_t orig_buf;
 140         caddr_t data_buf;
 141 };
 142
 143 struct dmtc_dump_helper {
 144         dm_target_crypt_config_t *priv;
 145         void *data;
 146         size_t length;
 147         off_t offset;
 148
 149         int sectors;
 150         int *ident;
 151
 152         struct cryptodesc crd[128];
 153         struct cryptop crp[128];
 154         u_char space[65536];
 155 };
 156
 157 #define DMTC_BUF_SIZE_WRITE \
 158     MAXPHYS + sizeof(struct dmtc_helper) + \
 159     MAXPHYS/DEV_BSIZE*(sizeof(struct cryptop) + sizeof(struct cryptodesc))
 160 #define DMTC_BUF_SIZE_READ \
 161     sizeof(struct dmtc_helper) + \
 162     MAXPHYS/DEV_BSIZE*(sizeof(struct cryptop) + sizeof(struct cryptodesc))
 163
 164 static void dmtc_crypto_dispatch(void *arg);
 165 static void dmtc_crypto_dump_start(dm_target_crypt_config_t *priv,
 166                                 struct dmtc_dump_helper *dump_helper);
 167 static void dmtc_crypto_read_start(dm_target_crypt_config_t *priv,
 168                                 struct bio *bio);
 169 static void dmtc_crypto_write_start(dm_target_crypt_config_t *priv,
 170                                 struct bio *bio);
 171 static void dmtc_bio_read_done(struct bio *bio);
 172 static void dmtc_bio_write_done(struct bio *bio);
 173 static int dmtc_crypto_cb_dump_done(struct cryptop *crp);
 174 static int dmtc_crypto_cb_read_done(struct cryptop *crp);
 175 static int dmtc_crypto_cb_write_done(struct cryptop *crp);
 176
 177 static ivgen_ctor_t     essiv_ivgen_ctor;
 178 static ivgen_dtor_t     essiv_ivgen_dtor;
 179 static ivgen_t          essiv_ivgen;
 180 static ivgen_t          plain_ivgen;
 181 static ivgen_t          plain64_ivgen;
 182
 183 static struct iv_generator ivgens[] = {
 184         { .name = "essiv", .ctor = essiv_ivgen_ctor, .dtor = essiv_ivgen_dtor,
 185             .gen_iv = essiv_ivgen },
 186         { .name = "plain", .ctor = NULL, .dtor = NULL, .gen_iv = plain_ivgen },
 187         { .name = "plain64", .ctor = NULL, .dtor = NULL, .gen_iv = plain64_ivgen },
 188         { NULL, NULL, NULL, NULL }
 189 };
 190
 191 struct objcache_malloc_args essiv_ivgen_malloc_args = {
 192                 2*sizeof(void *) + (sizeof(struct cryptodesc) +
 193                 sizeof(struct cryptop)), M_DMCRYPT };
 194
 195 static void
 196 dmtc_init_mpipe(struct target_crypt_config *priv)
 197 {
 198         int nmax;
 199
 200         nmax = (physmem*2/1000*PAGE_SIZE)/(DMTC_BUF_SIZE_WRITE + DMTC_BUF_SIZE_READ) + 1;
 201
 202         if (nmax < 2)
 203                 nmax = 2;
 204
 205         kprintf("dm_target_crypt: Setting min/max mpipe buffers: %d/%d\n", 2, nmax);
 206
 207         mpipe_init(&priv->write_mpipe, M_DMCRYPT, DMTC_BUF_SIZE_WRITE,
 208                    2, nmax, MPF_NOZERO | MPF_CALLBACK, NULL, NULL, NULL);
 209         mpipe_init(&priv->read_mpipe, M_DMCRYPT, DMTC_BUF_SIZE_READ,
 210                    2, nmax, MPF_NOZERO | MPF_CALLBACK, NULL, NULL, NULL);
 211 }
 212
 213 static void
 214 dmtc_destroy_mpipe(struct target_crypt_config *priv)
 215 {
 216         mpipe_done(&priv->write_mpipe);
 217         mpipe_done(&priv->read_mpipe);
 218 }
 219
 220 /*
 221  * Overwrite private information (in buf) to avoid leaking it
 222  */
 223 static void
 224 dmtc_crypto_clear(void *buf, size_t len)
 225 {
 226         memset(buf, 0xFF, len);
 227         bzero(buf, len);
 228 }
 229
 230 /*
 231  * ESSIV IV Generator Routines
 232  */
 233 static int
 234 essiv_ivgen_ctor(struct target_crypt_config *priv, char *iv_hash, void **p_ivpriv)
 235 {
 236         struct essiv_ivgen_priv *ivpriv;
 237         u_int8_t crypto_keyhash[SHA512_DIGEST_LENGTH];
 238         unsigned int klen, hashlen;
 239         int error;
 240
 241         klen = (priv->crypto_klen >> 3);
 242
 243         if (iv_hash == NULL)
 244                 return EINVAL;
 245
 246         if (!strcmp(iv_hash, "sha1")) {
 247                 SHA1_CTX ctx;
 248
 249                 hashlen = SHA1_RESULTLEN;
 250                 SHA1Init(&ctx);
 251                 SHA1Update(&ctx, priv->crypto_key, klen);
 252                 SHA1Final(crypto_keyhash, &ctx);
 253         } else if (!strcmp(iv_hash, "sha256")) {
 254                 SHA256_CTX ctx;
 255
 256                 hashlen = SHA256_DIGEST_LENGTH;
 257                 SHA256_Init(&ctx);
 258                 SHA256_Update(&ctx, priv->crypto_key, klen);
 259                 SHA256_Final(crypto_keyhash, &ctx);
 260         } else if (!strcmp(iv_hash, "sha384")) {
 261                 SHA384_CTX ctx;
 262
 263                 hashlen = SHA384_DIGEST_LENGTH;
 264                 SHA384_Init(&ctx);
 265                 SHA384_Update(&ctx, priv->crypto_key, klen);
 266                 SHA384_Final(crypto_keyhash, &ctx);
 267         } else if (!strcmp(iv_hash, "sha512")) {
 268                 SHA512_CTX ctx;
 269
 270                 hashlen = SHA512_DIGEST_LENGTH;
 271                 SHA512_Init(&ctx);
 272                 SHA512_Update(&ctx, priv->crypto_key, klen);
 273                 SHA512_Final(crypto_keyhash, &ctx);
 274         } else if (!strcmp(iv_hash, "md5")) {
 275                 MD5_CTX ctx;
 276
 277                 hashlen = MD5_DIGEST_LENGTH;
 278                 MD5Init(&ctx);
 279                 MD5Update(&ctx, priv->crypto_key, klen);
 280                 MD5Final(crypto_keyhash, &ctx);
 281         } else if (!strcmp(iv_hash, "rmd160") ||
 282                    !strcmp(iv_hash, "ripemd160")) {
 283                 RMD160_CTX ctx;
 284
 285                 hashlen = 160/8;
 286                 RMD160Init(&ctx);
 287                 RMD160Update(&ctx, priv->crypto_key, klen);
 288                 RMD160Final(crypto_keyhash, &ctx);
 289         } else {
 290                 return EINVAL;
 291         }
 292
 293         /* Convert hashlen to bits */
 294         hashlen <<= 3;
 295
 296         ivpriv = kmalloc(sizeof(struct essiv_ivgen_priv), M_DMCRYPT,
 297             M_WAITOK | M_ZERO);
 298         memcpy(ivpriv->crypto_keyhash, crypto_keyhash, sizeof(crypto_keyhash));
 299         ivpriv->keyhash_len = sizeof(crypto_keyhash);
 300         dmtc_crypto_clear(crypto_keyhash, sizeof(crypto_keyhash));
 301
 302         ivpriv->crypto_session.cri_alg = priv->crypto_alg;
 303         ivpriv->crypto_session.cri_key = (u_int8_t *)ivpriv->crypto_keyhash;
 304         ivpriv->crypto_session.cri_klen = hashlen;
 305         ivpriv->crypto_session.cri_mlen = 0;
 306         ivpriv->crypto_session.cri_next = NULL;
 307
 308         /*
 309          * XXX: in principle we also need to check if the block size of the
 310          *      cipher is a valid iv size for the block cipher.
 311          */
 312
 313         error = crypto_newsession(&ivpriv->crypto_sid,
 314                                   &ivpriv->crypto_session,
 315                                   CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
 316         if (error) {
 317                 kprintf("dm_target_crypt: Error during crypto_newsession "
 318                         "for essiv_ivgen, error = %d\n",
 319                         error);
 320                 dmtc_crypto_clear(ivpriv->crypto_keyhash, ivpriv->keyhash_len);
 321                 kfree(ivpriv, M_DMCRYPT);
 322                 return ENOTSUP;
 323         }
 324
 325         ivpriv->crp_crd_cache = objcache_create(
 326             "dmcrypt-essiv-cache", 0, 0,
 327             NULL, NULL, NULL,
 328             objcache_malloc_alloc,
 329             objcache_malloc_free,
 330             &essiv_ivgen_malloc_args );
 331
 332         *p_ivpriv = ivpriv;
 333         return 0;
 334 }
 335
 336 static int
 337 essiv_ivgen_dtor(struct target_crypt_config *priv, void *arg)
 338 {
 339         struct essiv_ivgen_priv *ivpriv;
 340
 341         ivpriv = (struct essiv_ivgen_priv *)arg;
 342         KKASSERT(ivpriv != NULL);
 343
 344         crypto_freesession(ivpriv->crypto_sid);
 345
 346         objcache_destroy(ivpriv->crp_crd_cache);
 347
 348         dmtc_crypto_clear(ivpriv->crypto_keyhash, ivpriv->keyhash_len);
 349         kfree(ivpriv, M_DMCRYPT);
 350
 351         return 0;
 352 }
 353
 354 static int
 355 essiv_ivgen_done(struct cryptop *crp)
 356 {
 357         struct essiv_ivgen_priv *ivpriv;
 358         void *free_addr;
 359         void *opaque;
 360
 361
 362         if (crp->crp_etype == EAGAIN)
 363                 return crypto_dispatch(crp);
 364
 365         if (crp->crp_etype != 0) {
 366                 kprintf("dm_target_crypt: essiv_ivgen_done, "
 367                         "crp->crp_etype = %d\n", crp->crp_etype);
 368         }
 369
 370         free_addr = crp->crp_opaque;
 371         /*
 372          * In-memory structure is:
 373          * |  ivpriv  |  opaque  |     crp     |      crd      |
 374          * | (void *) | (void *) |   (cryptop) |  (cryptodesc) |
 375          */
 376         ivpriv = *((struct essiv_ivgen_priv **)crp->crp_opaque);
 377         crp->crp_opaque += sizeof(void *);
 378         opaque = *((void **)crp->crp_opaque);
 379
 380         objcache_put(ivpriv->crp_crd_cache, free_addr);
 381         dmtc_crypto_dispatch(opaque);
 382         return 0;
 383 }
 384
 385 static void
 386 essiv_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 387             size_t iv_len, off_t sector, void *opaque)
 388 {
 389         struct essiv_ivgen_priv *ivpriv;
 390         struct cryptodesc *crd;
 391         struct cryptop *crp;
 392         caddr_t space, alloc_addr;
 393         int error;
 394
 395         ivpriv = priv->ivgen_priv;
 396         KKASSERT(ivpriv != NULL);
 397
 398         /*
 399          * In-memory structure is:
 400          * |  ivpriv  |  opaque  |     crp     |      crd      |
 401          * | (void *) | (void *) |   (cryptop) |  (cryptodesc) |
 402          */
 403         alloc_addr = space = objcache_get(ivpriv->crp_crd_cache, M_WAITOK);
 404         *((struct essiv_ivgen_priv **)space) = ivpriv;
 405         space += sizeof(void *);
 406         *((void **)space) = opaque;
 407         space += sizeof(void *);
 408         crp = (struct cryptop *)space;
 409         space += sizeof(struct cryptop);
 410         crd = (struct cryptodesc *)space;
 411
 412         bzero(iv, iv_len);
 413         bzero(crd, sizeof(struct cryptodesc));
 414         bzero(crp, sizeof(struct cryptop));
 415         *((off_t *)iv) = htole64(sector + priv->iv_offset);
 416         crp->crp_buf = (caddr_t)iv;
 417
 418         crp->crp_sid = ivpriv->crypto_sid;
 419         crp->crp_ilen = crp->crp_olen = iv_len;
 420
 421         crp->crp_opaque = alloc_addr;
 422
 423         crp->crp_callback = essiv_ivgen_done;
 424
 425         crp->crp_desc = crd;
 426         crp->crp_etype = 0;
 427         crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL | CRYPTO_F_BATCH;
 428
 429         crd->crd_alg = priv->crypto_alg;
 430 #if 0
 431         crd->crd_key = (caddr_t)priv->crypto_keyhash;
 432         crd->crd_klen = priv->crypto_klen;
 433 #endif
 434
 435         bzero(crd->crd_iv, sizeof(crd->crd_iv));
 436
 437         crd->crd_skip = 0;
 438         crd->crd_len = iv_len;
 439         crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
 440         crd->crd_flags |= CRD_F_ENCRYPT;
 441         crd->crd_next = NULL;
 442
 443         error = crypto_dispatch(crp);
 444         if (error)
 445                 kprintf("dm_target_crypt: essiv_ivgen, error = %d\n", error);
 446 }
 447
 448
 449 static void
 450 plain_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 451             size_t iv_len, off_t sector, void *opaque)
 452 {
 453         bzero(iv, iv_len);
 454         *((uint32_t *)iv) = htole32((uint32_t)(sector + priv->iv_offset));
 455         dmtc_crypto_dispatch(opaque);
 456 }
 457
 458 static void
 459 plain64_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 460     size_t iv_len, off_t sector, void *opaque)
 461 {
 462         bzero(iv, iv_len);
 463         *((uint64_t *)iv) = htole64((uint64_t)(sector + priv->iv_offset));
 464         dmtc_crypto_dispatch(opaque);
 465 }
 466
 467 #if 0
 468 static void
 469 geli_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 470            size_t iv_len, off_t sector, void *opaque)
 471 {
 472
 473         SHA512_CTX      ctx512;
 474         u_int8_t        md[SHA512_DIGEST_LENGTH]; /* Max. Digest Size */
 475
 476         memcpy(&ctx512, &priv->essivsha512_ctx, sizeof(SHA512_CTX));
 477         SHA512_Update(&ctx512, (u_int8_t*)&sector, sizeof(off_t));
 478         SHA512_Final(md, &ctx512);
 479
 480         memcpy(iv, md, iv_len);
 481         dmtc_crypto_dispatch(opaque);
 482 }
 483 #endif
 484
 485 /*
 486  * Init function called from dm_table_load_ioctl.
 487  * cryptsetup actually passes us this:
 488  * aes-cbc-essiv:sha256 7997f8af... 0 /dev/ad0s0a 8
 489  */
 490 static int
 491 hex2key(char *hex, size_t key_len, u_int8_t *key)
 492 {
 493         char hex_buf[3];
 494         size_t key_idx;
 495
 496         hex_buf[2] = 0;
 497         for (key_idx = 0; key_idx < key_len; ++key_idx) {
 498                 hex_buf[0] = *hex++;
 499                 hex_buf[1] = *hex++;
 500                 key[key_idx] = (u_int8_t)strtoul(hex_buf, NULL, 16);
 501         }
 502         hex_buf[0] = 0;
 503         hex_buf[1] = 0;
 504
 505         return 0;
 506 }
 507
 508 static int
 509 dm_target_crypt_init(dm_table_entry_t *table_en, int argc, char **argv)
 510 {
 511         dm_target_crypt_config_t *priv;
 512         size_t len;
 513         char *crypto_alg, *crypto_mode, *iv_mode, *iv_opt, *key, *dev;
 514         char *status_str;
 515         int i, klen, error;
 516         uint64_t iv_offset, block_offset;
 517
 518         if (argc != 5) {
 519                 kprintf("dm_target_crypt: not enough arguments, "
 520                         "need exactly 5\n");
 521                 return EINVAL;
 522         }
 523
 524         len = 0;
 525         for (i = 0; i < argc; i++) {
 526                 len += strlen(argv[i]);
 527                 len++;
 528         }
 529         /* len is strlen() of input string +1 */
 530         status_str = kmalloc(len, M_DMCRYPT, M_WAITOK);
 531
 532         crypto_alg = strsep(&argv[0], "-");
 533         crypto_mode = strsep(&argv[0], "-");
 534         iv_opt = strsep(&argv[0], "-");
 535         iv_mode = strsep(&iv_opt, ":");
 536         key = argv[1];
 537         iv_offset = strtouq(argv[2], NULL, 0);
 538         dev = argv[3];
 539         block_offset = strtouq(argv[4], NULL, 0);
 540         /* bits / 8 = bytes, 1 byte = 2 hexa chars, so << 2 */
 541         klen = strlen(key) << 2;
 542
 543 #if 0
 544         kprintf("dm_target_crypt - new: dev=%s, crypto_alg=%s, crypto_mode=%s, "
 545                 "iv_mode=%s, iv_opt=%s, key=%s, iv_offset=%ju, "
 546                 "block_offset=%ju\n",
 547                 dev, crypto_alg, crypto_mode, iv_mode, iv_opt, key, iv_offset,
 548                 block_offset);
 549 #endif
 550
 551         priv = kmalloc(sizeof(dm_target_crypt_config_t), M_DMCRYPT, M_WAITOK);
 552
 553         /* Insert dmp to global pdev list */
 554         if ((priv->pdev = dm_pdev_insert(dev)) == NULL) {
 555                 kprintf("dm_target_crypt: dm_pdev_insert failed\n");
 556                 kfree(status_str, M_DMCRYPT);
 557                 return ENOENT;
 558         }
 559
 560         /*
 561          * This code checks for valid combinations of algorithm and mode.
 562          * Currently supported options are:
 563          *
 564          * *-cbc
 565          * aes-xts
 566          * twofish-xts
 567          * serpent-xts
 568          */
 569         if ((strcmp(crypto_mode, "cbc") != 0) &&
 570             !((strcmp(crypto_mode, "xts") == 0) &&
 571             ((strcmp(crypto_alg, "aes") == 0) ||
 572             (strcmp(crypto_alg, "twofish") == 0) ||
 573             (strcmp(crypto_alg, "serpent") == 0))))
 574         {
 575                 kprintf("dm_target_crypt: only support 'cbc' chaining mode,"
 576                     " aes-xts, twofish-xts and serpent-xts, "
 577                     "invalid mode '%s-%s'\n",
 578                     crypto_alg, crypto_mode);
 579                 goto notsup;
 580         }
 581
 582         if (!strcmp(crypto_alg, "aes")) {
 583                 if (!strcmp(crypto_mode, "xts")) {
 584                         priv->crypto_alg = CRYPTO_AES_XTS;
 585                         if (klen != 256 && klen != 512)
 586                                 goto notsup;
 587                 } else if (!strcmp(crypto_mode, "cbc")) {
 588                         priv->crypto_alg = CRYPTO_AES_CBC;
 589                         if (klen != 128 && klen != 192 && klen != 256)
 590                                 goto notsup;
 591                 } else {
 592                         goto notsup;
 593                 }
 594                 priv->crypto_klen = klen;
 595         } else if (!strcmp(crypto_alg, "twofish")) {
 596                 if (!strcmp(crypto_mode, "xts")) {
 597                         priv->crypto_alg = CRYPTO_TWOFISH_XTS;
 598                         if (klen != 256 && klen != 512)
 599                                 goto notsup;
 600                 } else if (!strcmp(crypto_mode, "cbc")) {
 601                         priv->crypto_alg = CRYPTO_TWOFISH_CBC;
 602                         if (klen != 128 && klen != 192 && klen != 256)
 603                                 goto notsup;
 604                 } else {
 605                         goto notsup;
 606                 }
 607                 priv->crypto_klen = klen;
 608         } else if (!strcmp(crypto_alg, "serpent")) {
 609                 if (!strcmp(crypto_mode, "xts")) {
 610                         priv->crypto_alg = CRYPTO_SERPENT_XTS;
 611                         if (klen != 256 && klen != 512)
 612                                 goto notsup;
 613                 } else if (!strcmp(crypto_mode, "cbc")) {
 614                         priv->crypto_alg = CRYPTO_SERPENT_CBC;
 615                         if (klen != 128 && klen != 192 && klen != 256)
 616                                 goto notsup;
 617                 } else {
 618                         goto notsup;
 619                 }
 620                 priv->crypto_klen = klen;
 621         } else if (!strcmp(crypto_alg, "blowfish")) {
 622                 priv->crypto_alg = CRYPTO_BLF_CBC;
 623                 if (klen < 128 || klen > 448 || (klen % 8) != 0)
 624                         goto notsup;
 625                 priv->crypto_klen = klen;
 626         } else if (!strcmp(crypto_alg, "3des") ||
 627                    !strncmp(crypto_alg, "des3", 4)) {
 628                 priv->crypto_alg = CRYPTO_3DES_CBC;
 629                 if (klen != 168)
 630                         goto notsup;
 631                 priv->crypto_klen = 168;
 632         } else if (!strcmp(crypto_alg, "camellia")) {
 633                 priv->crypto_alg = CRYPTO_CAMELLIA_CBC;
 634                 if (klen != 128 && klen != 192 && klen != 256)
 635                         goto notsup;
 636                 priv->crypto_klen = klen;
 637         } else if (!strcmp(crypto_alg, "skipjack")) {
 638                 priv->crypto_alg = CRYPTO_SKIPJACK_CBC;
 639                 if (klen != 80)
 640                         goto notsup;
 641                 priv->crypto_klen = 80;
 642         } else if (!strcmp(crypto_alg, "cast5")) {
 643                 priv->crypto_alg = CRYPTO_CAST_CBC;
 644                 if (klen != 128)
 645                         goto notsup;
 646                 priv->crypto_klen = 128;
 647         } else if (!strcmp(crypto_alg, "null")) {
 648                 priv->crypto_alg = CRYPTO_NULL_CBC;
 649                 if (klen != 128)
 650                         goto notsup;
 651                 priv->crypto_klen = 128;
 652         } else {
 653                 kprintf("dm_target_crypt: Unsupported crypto algorithm: %s\n",
 654                         crypto_alg);
 655                 goto notsup;
 656         }
 657
 658         /* Save length of param string */
 659         priv->params_len = len;
 660         priv->block_offset = block_offset;
 661         priv->iv_offset = iv_offset - block_offset;
 662
 663         dm_table_add_deps(table_en, priv->pdev);
 664
 665         dm_table_init_target(table_en, DM_CRYPTO_DEV, priv);
 666
 667         error = hex2key(key, priv->crypto_klen >> 3,
 668                         (u_int8_t *)priv->crypto_key);
 669
 670         if (error) {
 671                 kprintf("dm_target_crypt: hex2key failed, "
 672                         "invalid key format\n");
 673                 goto notsup;
 674         }
 675
 676         /* Handle cmd */
 677         for(i = 0; ivgens[i].name != NULL; i++) {
 678                 if (!strcmp(iv_mode, ivgens[i].name))
 679                         break;
 680         }
 681
 682         if (ivgens[i].name == NULL) {
 683                 kprintf("dm_target_crypt: iv_mode='%s' unsupported\n",
 684                         iv_mode);
 685                 goto notsup;
 686         }
 687
 688         /* Call our ivgen constructor */
 689         if (ivgens[i].ctor != NULL) {
 690                 error = ivgens[i].ctor(priv, iv_opt,
 691                     &priv->ivgen_priv);
 692                 if (error) {
 693                         kprintf("dm_target_crypt: ctor for '%s' failed\n",
 694                             ivgens[i].name);
 695                         goto notsup;
 696                 }
 697         }
 698
 699         priv->ivgen = &ivgens[i];
 700
 701         priv->crypto_session.cri_alg = priv->crypto_alg;
 702         priv->crypto_session.cri_key = (u_int8_t *)priv->crypto_key;
 703         priv->crypto_session.cri_klen = priv->crypto_klen;
 704         priv->crypto_session.cri_mlen = 0;
 705         priv->crypto_session.cri_next = NULL;
 706
 707         error = crypto_newsession(&priv->crypto_sid,
 708                                   &priv->crypto_session,
 709                                   CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
 710         if (error) {
 711                 kprintf("dm_target_crypt: Error during crypto_newsession, "
 712                         "error = %d\n",
 713                         error);
 714                 goto notsup;
 715         }
 716
 717         memset(key, '0', strlen(key));
 718         if (iv_opt) {
 719                 ksprintf(status_str, "%s-%s-%s:%s %s %ju %s %ju",
 720                     crypto_alg, crypto_mode, iv_mode, iv_opt,
 721                     key, iv_offset, dev, block_offset);
 722         } else {
 723                 ksprintf(status_str, "%s-%s-%s %s %ju %s %ju",
 724                     crypto_alg, crypto_mode, iv_mode,
 725                     key, iv_offset, dev, block_offset);
 726         }
 727         priv->status_str = status_str;
 728
 729         /* Initialize mpipes */
 730         dmtc_init_mpipe(priv);
 731
 732         return 0;
 733
 734 notsup:
 735         kprintf("dm_target_crypt: ENOTSUP\n");
 736         kfree(status_str, M_DMCRYPT);
 737         return ENOTSUP;
 738 }
 739
 740 /* Table routine called to get params string. */
 741 static char *
 742 dm_target_crypt_table(void *target_config)
 743 {
 744         dm_target_crypt_config_t *priv;
 745         char *params;
 746
 747         priv = target_config;
 748
 749         params = dm_alloc_string(DM_MAX_PARAMS_SIZE);
 750
 751         ksnprintf(params, DM_MAX_PARAMS_SIZE, "%s",
 752             priv->status_str);
 753
 754         return params;
 755 }
 756
 757 static int
 758 dm_target_crypt_destroy(dm_table_entry_t *table_en)
 759 {
 760         dm_target_crypt_config_t *priv;
 761
 762         /*
 763          * Disconnect the crypt config before unbusying the target.
 764          */
 765         priv = table_en->target_config;
 766         if (priv == NULL)
 767                 return 0;
 768         table_en->target_config = NULL;
 769         dm_pdev_decr(priv->pdev);
 770
 771         /*
 772          * Clean up the crypt config
 773          *
 774          * Overwrite the private information before freeing memory to
 775          * avoid leaking it.
 776          */
 777         if (priv->status_str) {
 778                 dmtc_crypto_clear(priv->status_str, strlen(priv->status_str));
 779                 kfree(priv->status_str, M_DMCRYPT);
 780                 crypto_freesession(priv->crypto_sid);
 781         }
 782
 783         if ((priv->ivgen) && (priv->ivgen->dtor != NULL)) {
 784                 priv->ivgen->dtor(priv, priv->ivgen_priv);
 785         }
 786
 787         /* Destroy mpipes */
 788         dmtc_destroy_mpipe(priv);
 789
 790         dmtc_crypto_clear(priv, sizeof(dm_target_crypt_config_t));
 791         kfree(priv, M_DMCRYPT);
 792
 793         return 0;
 794 }
 795
 796 /************************************************************************
 797  *                      STRATEGY SUPPORT FUNCTIONS                      *
 798  ************************************************************************
 799  *
 800  * READ PATH:   doio -> bio_read_done -> crypto_work -> crypto_cb_read_done
 801  * WRITE PATH:  crypto_work -> crypto_cb_write_done -> doio -> bio_write_done
 802  */
 803
 804 /*
 805  * Wrapper around crypto_dispatch() to match dispatch_t type
 806  */
 807 static void
 808 dmtc_crypto_dispatch(void *arg)
 809 {
 810         struct cryptop *crp;
 811
 812         crp = (struct cryptop *)arg;
 813         KKASSERT(crp != NULL);
 814         KTR_LOG(dmcrypt_crypto_dispatch, crp);
 815         crypto_dispatch(crp);
 816 }
 817
 818 /*
 819  * Start IO operation, called from dmstrategy routine.
 820  */
 821 static int
 822 dm_target_crypt_strategy(dm_table_entry_t *table_en, struct buf *bp)
 823 {
 824         struct bio *bio;
 825
 826         dm_target_crypt_config_t *priv;
 827         priv = table_en->target_config;
 828
 829         /* Get rid of stuff we can't really handle */
 830         if ((bp->b_cmd == BUF_CMD_READ) || (bp->b_cmd == BUF_CMD_WRITE)) {
 831                 if (((bp->b_bcount % DEV_BSIZE) != 0) || (bp->b_bcount == 0)) {
 832                         kprintf("dm_target_crypt_strategy: can't really "
 833                                 "handle bp->b_bcount = %d\n",
 834                                 bp->b_bcount);
 835                         bp->b_error = EINVAL;
 836                         bp->b_flags |= B_ERROR | B_INVAL;
 837                         biodone(&bp->b_bio1);
 838                         return 0;
 839                 }
 840         }
 841
 842         KTR_LOG(dmcrypt_crypt_strategy, bp->b_cmd, bp);
 843
 844         switch (bp->b_cmd) {
 845         case BUF_CMD_READ:
 846                 bio = push_bio(&bp->b_bio1);
 847                 bio->bio_offset = bp->b_bio1.bio_offset +
 848                                   priv->block_offset * DEV_BSIZE;
 849                 bio->bio_caller_info1.ptr = priv;
 850                 bio->bio_done = dmtc_bio_read_done;
 851                 vn_strategy(priv->pdev->pdev_vnode, bio);
 852                 break;
 853         case BUF_CMD_WRITE:
 854                 bio = push_bio(&bp->b_bio1);
 855                 bio->bio_offset = bp->b_bio1.bio_offset +
 856                                   priv->block_offset * DEV_BSIZE;
 857                 bio->bio_caller_info1.ptr = priv;
 858                 dmtc_crypto_write_start(priv, bio);
 859                 break;
 860         default:
 861                 vn_strategy(priv->pdev->pdev_vnode, &bp->b_bio1);
 862                 break;
 863         }
 864         return 0;
 865 }
 866
 867 /*
 868  * STRATEGY READ PATH PART 1/3 (after read BIO completes)
 869  */
 870 static void
 871 dmtc_bio_read_done(struct bio *bio)
 872 {
 873         struct bio *obio;
 874
 875         dm_target_crypt_config_t *priv;
 876
 877         KTR_LOG(dmcrypt_bio_read_done, bio->bio_buf);
 878
 879         /*
 880          * If a read error occurs we shortcut the operation, otherwise
 881          * go on to stage 2.
 882          */
 883         if (bio->bio_buf->b_flags & B_ERROR) {
 884                 obio = pop_bio(bio);
 885                 biodone(obio);
 886         } else {
 887                 priv = bio->bio_caller_info1.ptr;
 888                 dmtc_crypto_read_start(priv, bio);
 889         }
 890 }
 891
 892 /*
 893  * STRATEGY READ PATH PART 2/3
 894  */
 895 static void
 896 dmtc_crypto_read_retry(void *arg1, void *arg2)
 897 {
 898         dm_target_crypt_config_t *priv = arg1;
 899         struct bio *bio = arg2;
 900
 901         dmtc_crypto_read_start(priv, bio);
 902 }
 903
 904 static void
 905 dmtc_crypto_read_start(dm_target_crypt_config_t *priv, struct bio *bio)
 906 {
 907         struct dmtc_helper *dmtc;
 908         struct cryptodesc *crd;
 909         struct cryptop *crp;
 910         int i, bytes, sectors, sz;
 911         off_t isector;
 912         u_char *ptr, *space;
 913
 914         /*
 915          * Note: b_resid no good after read I/O, it will be 0, use
 916          *       b_bcount.
 917          */
 918         bytes = bio->bio_buf->b_bcount;
 919         isector = bio->bio_offset / DEV_BSIZE;  /* ivgen salt base? */
 920         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
 921         sz = sectors * (sizeof(*crp) + sizeof(*crd));
 922
 923         /*
 924          * For reads with bogus page we can't decrypt in place as stuff
 925          * can get ripped out from under us.
 926          *
 927          * XXX actually it looks like we can, and in any case the initial
 928          * read already completed and threw crypted data into the buffer
 929          * cache buffer.  Disable for now.
 930          */
 931         space = mpipe_alloc_callback(&priv->read_mpipe,
 932                                      dmtc_crypto_read_retry, priv, bio);
 933         if (space == NULL)
 934                 return;
 935
 936         dmtc = (struct dmtc_helper *)space;
 937         dmtc->free_addr = space;
 938         space += sizeof(struct dmtc_helper);
 939         dmtc->orig_buf = NULL;
 940         dmtc->data_buf = bio->bio_buf->b_data;
 941         dmtc->priv = priv;
 942         bio->bio_caller_info2.ptr = dmtc;
 943         bio->bio_buf->b_error = 0;
 944
 945         /*
 946          * Load crypto descriptors (crp/crd loop)
 947          */
 948         bzero(space, sz);
 949         ptr = space;
 950         bio->bio_caller_info3.value = sectors;
 951         cpu_sfence();
 952 #if 0
 953         kprintf("Read, bytes = %d (b_bcount), "
 954                 "sectors = %d (bio = %p, b_cmd = %d)\n",
 955                 bytes, sectors, bio, bio->bio_buf->b_cmd);
 956 #endif
 957         for (i = 0; i < sectors; i++) {
 958                 crp = (struct cryptop *)ptr;
 959                 ptr += sizeof(*crp);
 960                 crd = (struct cryptodesc *)ptr;
 961                 ptr += sizeof (*crd);
 962
 963                 crp->crp_buf = dmtc->data_buf + i * DEV_BSIZE;
 964
 965                 crp->crp_sid = priv->crypto_sid;
 966                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
 967
 968                 crp->crp_opaque = (void *)bio;
 969
 970                 crp->crp_callback = dmtc_crypto_cb_read_done;
 971                 crp->crp_desc = crd;
 972                 crp->crp_etype = 0;
 973                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
 974                                  CRYPTO_F_BATCH;
 975
 976                 crd->crd_alg = priv->crypto_alg;
 977 #if 0
 978                 crd->crd_key = (caddr_t)priv->crypto_key;
 979                 crd->crd_klen = priv->crypto_klen;
 980 #endif
 981
 982                 crd->crd_skip = 0;
 983                 crd->crd_len = DEV_BSIZE /* XXX */;
 984                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
 985                 crd->crd_next = NULL;
 986
 987                 crd->crd_flags &= ~CRD_F_ENCRYPT;
 988
 989                 KTR_LOG(dmcrypt_crypto_read_start, crp, bio->bio_buf, i,
 990                     sectors);
 991
 992                 /*
 993                  * Note: last argument is used to generate salt(?) and is
 994                  *       a 64 bit value, but the original code passed an
 995                  *       int.  Changing it now will break pre-existing
 996                  *       crypt volumes.
 997                  */
 998                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
 999                                     isector + i, crp);
1000         }
1001 }
1002
1003 /*
1004  * STRATEGY READ PATH PART 3/3
1005  */
1006 static int
1007 dmtc_crypto_cb_read_done(struct cryptop *crp)
1008 {
1009         struct dmtc_helper *dmtc;
1010         struct bio *bio, *obio;
1011         int n;
1012
1013         if (crp->crp_etype == EAGAIN)
1014                 return crypto_dispatch(crp);
1015
1016         bio = (struct bio *)crp->crp_opaque;
1017         KKASSERT(bio != NULL);
1018
1019         /*
1020          * Cumulative error
1021          */
1022         if (crp->crp_etype) {
1023                 kprintf("dm_target_crypt: dmtc_crypto_cb_read_done "
1024                         "crp_etype = %d\n",
1025                         crp->crp_etype);
1026                 bio->bio_buf->b_error = crp->crp_etype;
1027         }
1028
1029         /*
1030          * On the last chunk of the decryption we do any required copybacks
1031          * and complete the I/O.
1032          */
1033         n = atomic_fetchadd_int(&bio->bio_caller_info3.value, -1);
1034 #if 0
1035         kprintf("dmtc_crypto_cb_read_done %p, n = %d\n", bio, n);
1036 #endif
1037
1038         KTR_LOG(dmcrypt_crypto_cb_read_done, crp, bio->bio_buf, n);
1039
1040         if (n == 1) {
1041                 /*
1042                  * For the B_HASBOGUS case we didn't decrypt in place,
1043                  * so we need to copy stuff back into the buf.
1044                  *
1045                  * (disabled for now).
1046                  */
1047                 dmtc = bio->bio_caller_info2.ptr;
1048                 if (bio->bio_buf->b_error) {
1049                         bio->bio_buf->b_flags |= B_ERROR;
1050                 }
1051 #if 0
1052                 else if (bio->bio_buf->b_flags & B_HASBOGUS) {
1053                         memcpy(bio->bio_buf->b_data, dmtc->data_buf,
1054                                bio->bio_buf->b_bcount);
1055                 }
1056 #endif
1057                 mpipe_free(&dmtc->priv->read_mpipe, dmtc->free_addr);
1058                 obio = pop_bio(bio);
1059                 biodone(obio);
1060         }
1061         return 0;
1062 }
1063 /* END OF STRATEGY READ SECTION */
1064
1065 /*
1066  * STRATEGY WRITE PATH PART 1/3
1067  */
1068
1069 static void
1070 dmtc_crypto_write_retry(void *arg1, void *arg2)
1071 {
1072         dm_target_crypt_config_t *priv = arg1;
1073         struct bio *bio = arg2;
1074
1075         KTR_LOG(dmcrypt_crypto_write_retry, bio->bio_buf);
1076
1077         dmtc_crypto_write_start(priv, bio);
1078 }
1079
1080 static void
1081 dmtc_crypto_write_start(dm_target_crypt_config_t *priv, struct bio *bio)
1082 {
1083         struct dmtc_helper *dmtc;
1084         struct cryptodesc *crd;
1085         struct cryptop *crp;
1086         int i, bytes, sectors, sz;
1087         off_t isector;
1088         u_char *ptr, *space;
1089
1090         /*
1091          * Use b_bcount for consistency
1092          */
1093         bytes = bio->bio_buf->b_bcount;
1094
1095         isector = bio->bio_offset / DEV_BSIZE;  /* ivgen salt base? */
1096         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
1097         sz = sectors * (sizeof(*crp) + sizeof(*crd));
1098
1099         /*
1100          * For writes and reads with bogus page don't decrypt in place.
1101          */
1102         space = mpipe_alloc_callback(&priv->write_mpipe,
1103                                      dmtc_crypto_write_retry, priv, bio);
1104         if (space == NULL)
1105                 return;
1106
1107         dmtc = (struct dmtc_helper *)space;
1108         dmtc->free_addr = space;
1109         space += sizeof(struct dmtc_helper);
1110         memcpy(space + sz, bio->bio_buf->b_data, bytes);
1111
1112         bio->bio_caller_info2.ptr = dmtc;
1113         bio->bio_buf->b_error = 0;
1114
1115         dmtc->orig_buf = bio->bio_buf->b_data;
1116         dmtc->data_buf = space + sz;
1117         dmtc->priv = priv;
1118
1119         /*
1120          * Load crypto descriptors (crp/crd loop)
1121          */
1122         bzero(space, sz);
1123         ptr = space;
1124         bio->bio_caller_info3.value = sectors;
1125         cpu_sfence();
1126 #if 0
1127         kprintf("Write, bytes = %d (b_bcount), "
1128                 "sectors = %d (bio = %p, b_cmd = %d)\n",
1129                 bytes, sectors, bio, bio->bio_buf->b_cmd);
1130 #endif
1131         for (i = 0; i < sectors; i++) {
1132                 crp = (struct cryptop *)ptr;
1133                 ptr += sizeof(*crp);
1134                 crd = (struct cryptodesc *)ptr;
1135                 ptr += sizeof (*crd);
1136
1137                 crp->crp_buf = dmtc->data_buf + i * DEV_BSIZE;
1138
1139                 crp->crp_sid = priv->crypto_sid;
1140                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
1141
1142                 crp->crp_opaque = (void *)bio;
1143
1144                 crp->crp_callback = dmtc_crypto_cb_write_done;
1145                 crp->crp_desc = crd;
1146                 crp->crp_etype = 0;
1147                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
1148                                  CRYPTO_F_BATCH;
1149
1150                 crd->crd_alg = priv->crypto_alg;
1151 #if 0
1152                 crd->crd_key = (caddr_t)priv->crypto_key;
1153                 crd->crd_klen = priv->crypto_klen;
1154 #endif
1155
1156                 crd->crd_skip = 0;
1157                 crd->crd_len = DEV_BSIZE /* XXX */;
1158                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
1159                 crd->crd_next = NULL;
1160
1161                 crd->crd_flags |= CRD_F_ENCRYPT;
1162
1163                 /*
1164                  * Note: last argument is used to generate salt(?) and is
1165                  *       a 64 bit value, but the original code passed an
1166                  *       int.  Changing it now will break pre-existing
1167                  *       crypt volumes.
1168                  */
1169
1170                 KTR_LOG(dmcrypt_crypto_write_start, crp, bio->bio_buf,
1171                     i, sectors);
1172
1173                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
1174                                     isector + i, crp);
1175         }
1176 }
1177
1178 /*
1179  * STRATEGY WRITE PATH PART 2/3
1180  */
1181 static int
1182 dmtc_crypto_cb_write_done(struct cryptop *crp)
1183 {
1184         struct dmtc_helper *dmtc;
1185         dm_target_crypt_config_t *priv;
1186         struct bio *bio, *obio;
1187         int n;
1188
1189         if (crp->crp_etype == EAGAIN)
1190                 return crypto_dispatch(crp);
1191
1192         bio = (struct bio *)crp->crp_opaque;
1193         KKASSERT(bio != NULL);
1194
1195         /*
1196          * Cumulative error
1197          */
1198         if (crp->crp_etype != 0) {
1199                 kprintf("dm_target_crypt: dmtc_crypto_cb_write_done "
1200                         "crp_etype = %d\n",
1201                 crp->crp_etype);
1202                 bio->bio_buf->b_error = crp->crp_etype;
1203         }
1204
1205         /*
1206          * On the last chunk of the encryption we issue the write
1207          */
1208         n = atomic_fetchadd_int(&bio->bio_caller_info3.value, -1);
1209 #if 0
1210         kprintf("dmtc_crypto_cb_write_done %p, n = %d\n", bio, n);
1211 #endif
1212
1213         KTR_LOG(dmcrypt_crypto_cb_write_done, crp, bio->bio_buf, n);
1214
1215         if (n == 1) {
1216                 dmtc = bio->bio_caller_info2.ptr;
1217                 priv = (dm_target_crypt_config_t *)bio->bio_caller_info1.ptr;
1218
1219                 if (bio->bio_buf->b_error) {
1220                         bio->bio_buf->b_flags |= B_ERROR;
1221                         mpipe_free(&dmtc->priv->write_mpipe, dmtc->free_addr);
1222                         obio = pop_bio(bio);
1223                         biodone(obio);
1224                 } else {
1225                         dmtc->orig_buf = bio->bio_buf->b_data;
1226                         bio->bio_buf->b_data = dmtc->data_buf;
1227                         bio->bio_done = dmtc_bio_write_done;
1228                         vn_strategy(priv->pdev->pdev_vnode, bio);
1229                 }
1230         }
1231         return 0;
1232 }
1233
1234 /*
1235  * STRATEGY WRITE PATH PART 3/3
1236  */
1237 static void
1238 dmtc_bio_write_done(struct bio *bio)
1239 {
1240         struct dmtc_helper *dmtc;
1241         struct bio *obio;
1242
1243         dmtc = bio->bio_caller_info2.ptr;
1244         bio->bio_buf->b_data = dmtc->orig_buf;
1245         mpipe_free(&dmtc->priv->write_mpipe, dmtc->free_addr);
1246
1247         KTR_LOG(dmcrypt_bio_write_done, bio->bio_buf);
1248
1249         obio = pop_bio(bio);
1250         biodone(obio);
1251 }
1252 /* END OF STRATEGY WRITE SECTION */
1253
1254
1255
1256 /* DUMPING MAGIC */
1257
1258 extern int tsleep_crypto_dump;
1259
1260 static int
1261 dm_target_crypt_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
1262 {
1263         static struct dmtc_dump_helper dump_helper;
1264         dm_target_crypt_config_t *priv;
1265         int id;
1266         static int first_call = 1;
1267
1268         priv = table_en->target_config;
1269
1270         if (first_call) {
1271                 first_call = 0;
1272                 dump_reactivate_cpus();
1273         }
1274
1275         /* Magically enable tsleep */
1276         tsleep_crypto_dump = 1;
1277         id = 0;
1278
1279         /*
1280          * 0 length means flush buffers and return
1281          */
1282         if (length == 0) {
1283                 if (priv->pdev->pdev_vnode->v_rdev == NULL) {
1284                         tsleep_crypto_dump = 0;
1285                         return ENXIO;
1286                 }
1287                 dev_ddump(priv->pdev->pdev_vnode->v_rdev,
1288                     data, 0, offset, 0);
1289                 tsleep_crypto_dump = 0;
1290                 return 0;
1291         }
1292
1293         bzero(&dump_helper, sizeof(dump_helper));
1294         dump_helper.priv = priv;
1295         dump_helper.data = data;
1296         dump_helper.length = length;
1297         dump_helper.offset = offset +
1298             priv->block_offset * DEV_BSIZE;
1299         dump_helper.ident = &id;
1300         dmtc_crypto_dump_start(priv, &dump_helper);
1301
1302         /*
1303          * Hackery to make stuff appear synchronous. The crypto callback will
1304          * set id to 1 and call wakeup on it. If the request completed
1305          * synchronously, id will be 1 and we won't bother to sleep. If not,
1306          * the crypto request will complete asynchronously and we sleep until
1307          * it's done.
1308          */
1309         if (id == 0)
1310                 tsleep(&dump_helper, 0, "cryptdump", 0);
1311
1312         dump_helper.offset = dm_pdev_correct_dump_offset(priv->pdev,
1313             dump_helper.offset);
1314
1315         dev_ddump(priv->pdev->pdev_vnode->v_rdev,
1316             dump_helper.space, 0, dump_helper.offset,
1317             dump_helper.length);
1318
1319         tsleep_crypto_dump = 0;
1320         return 0;
1321 }
1322
1323 static void
1324 dmtc_crypto_dump_start(dm_target_crypt_config_t *priv, struct dmtc_dump_helper *dump_helper)
1325 {
1326         struct cryptodesc *crd;
1327         struct cryptop *crp;
1328         int i, bytes, sectors;
1329         off_t isector;
1330
1331         bytes = dump_helper->length;
1332
1333         isector = dump_helper->offset / DEV_BSIZE;      /* ivgen salt base? */
1334         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
1335         dump_helper->sectors = sectors;
1336 #if 0
1337         kprintf("Dump, bytes = %d, "
1338                 "sectors = %d, LENGTH=%zu\n", bytes, sectors, dump_helper->length);
1339 #endif
1340         KKASSERT(dump_helper->length <= 65536);
1341
1342         memcpy(dump_helper->space, dump_helper->data, bytes);
1343
1344         cpu_sfence();
1345
1346         for (i = 0; i < sectors; i++) {
1347                 crp = &dump_helper->crp[i];
1348                 crd = &dump_helper->crd[i];
1349
1350                 crp->crp_buf = dump_helper->space + i * DEV_BSIZE;
1351
1352                 crp->crp_sid = priv->crypto_sid;
1353                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
1354
1355                 crp->crp_opaque = (void *)dump_helper;
1356
1357                 crp->crp_callback = dmtc_crypto_cb_dump_done;
1358                 crp->crp_desc = crd;
1359                 crp->crp_etype = 0;
1360                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
1361                                  CRYPTO_F_BATCH;
1362
1363                 crd->crd_alg = priv->crypto_alg;
1364
1365                 crd->crd_skip = 0;
1366                 crd->crd_len = DEV_BSIZE /* XXX */;
1367                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
1368                 crd->crd_next = NULL;
1369
1370                 crd->crd_flags |= CRD_F_ENCRYPT;
1371
1372                 /*
1373                  * Note: last argument is used to generate salt(?) and is
1374                  *       a 64 bit value, but the original code passed an
1375                  *       int.  Changing it now will break pre-existing
1376                  *       crypt volumes.
1377                  */
1378                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
1379                                     isector + i, crp);
1380         }
1381 }
1382
1383 static int
1384 dmtc_crypto_cb_dump_done(struct cryptop *crp)
1385 {
1386         struct dmtc_dump_helper *dump_helper;
1387         int n;
1388
1389         if (crp->crp_etype == EAGAIN)
1390                 return crypto_dispatch(crp);
1391
1392         dump_helper = (struct dmtc_dump_helper *)crp->crp_opaque;
1393         KKASSERT(dump_helper != NULL);
1394
1395         if (crp->crp_etype != 0) {
1396                 kprintf("dm_target_crypt: dmtc_crypto_cb_dump_done "
1397                         "crp_etype = %d\n",
1398                 crp->crp_etype);
1399                 return crp->crp_etype;
1400         }
1401
1402         /*
1403          * On the last chunk of the encryption we return control
1404          */
1405         n = atomic_fetchadd_int(&dump_helper->sectors, -1);
1406
1407         if (n == 1) {
1408                 atomic_add_int(dump_helper->ident, 1);
1409                 wakeup(dump_helper);
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int
1416 dmtc_mod_handler(module_t mod, int type, void *unused)
1417 {
1418         dm_target_t *dmt = NULL;
1419         int err = 0;
1420
1421         switch (type) {
1422         case MOD_LOAD:
1423                 if ((dmt = dm_target_lookup("crypt")) != NULL) {
1424                         dm_target_unbusy(dmt);
1425                         return EEXIST;
1426                 }
1427                 dmt = dm_target_alloc("crypt");
1428                 dmt->version[0] = 1;
1429                 dmt->version[1] = 6;
1430                 dmt->version[2] = 0;
1431                 strlcpy(dmt->name, "crypt", DM_MAX_TYPE_NAME);
1432                 dmt->init = &dm_target_crypt_init;
1433                 dmt->destroy = &dm_target_crypt_destroy;
1434                 dmt->strategy = &dm_target_crypt_strategy;
1435                 dmt->table = &dm_target_crypt_table;
1436                 dmt->dump = &dm_target_crypt_dump;
1437
1438                 err = dm_target_insert(dmt);
1439                 if (!err)
1440                         kprintf("dm_target_crypt: Successfully initialized\n");
1441                 break;
1442
1443         case MOD_UNLOAD:
1444                 err = dm_target_rem("crypt");
1445                 if (err == 0) {
1446                         kprintf("dm_target_crypt: unloaded\n");
1447                 }
1448                 break;
1449
1450         default:
1451                 break;
1452         }
1453
1454         return err;
1455 }
1456
1457 DM_TARGET_MODULE(dm_target_crypt, dmtc_mod_handler);