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/param.h>
  40 #include <sys/endian.h>
  41
  42 #include <sys/bio.h>
  43 #include <sys/buf.h>
  44 #include <sys/globaldata.h>
  45 #include <sys/kerneldump.h>
  46 #include <sys/malloc.h>
  47 #include <sys/mpipe.h>
  48 #include <sys/md5.h>
  49 #include <sys/mutex2.h>
  50 #include <sys/vnode.h>
  51 #include <crypto/sha1.h>
  52 #include <crypto/sha2/sha2.h>
  53 #include <opencrypto/cryptodev.h>
  54 #include <opencrypto/rmd160.h>
  55 #include <machine/cpufunc.h>
  56
  57 #include <sys/ktr.h>
  58
  59 #include <dev/disk/dm/dm.h>
  60 MALLOC_DEFINE(M_DMCRYPT, "dm_crypt", "Device Mapper Target Crypt");
  61
  62 KTR_INFO_MASTER(dmcrypt);
  63
  64 #if !defined(KTR_DMCRYPT)
  65 #define KTR_DMCRYPT     KTR_ALL
  66 #endif
  67
  68 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_dispatch, 0,
  69     "crypto_dispatch(%p)", struct cryptop *crp);
  70 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypt_strategy, 0,
  71     "crypt_strategy(b_cmd = %d, bp = %p)", int cmd, struct buf *bp);
  72 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_write_start, 1,
  73     "crypto_write_start(crp = %p, bp = %p, sector = %d/%d)",
  74     struct cryptop *crp, struct buf *bp, int i, int sectors);
  75 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_cb_write_done, 1,
  76     "crypto_cb_write_done(crp = %p, bp = %p, n = %d)",
  77     struct cryptop *crp, struct buf *bp, int n);
  78 KTR_INFO(KTR_DMCRYPT, dmcrypt, bio_write_done, 1,
  79     "bio_write_done(bp = %p)", struct buf *bp);
  80 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_write_retry, 1,
  81     "crypto_write_retry(crp = %p)", struct buf *bp);
  82 KTR_INFO(KTR_DMCRYPT, dmcrypt, bio_read_done, 2,
  83     "bio_read_done(bp = %p)", struct buf *bp);
  84 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_read_start, 2,
  85     "crypto_read_start(crp = %p, bp = %p, sector = %d/%d)",
  86     struct cryptop *crp, struct buf *bp, int i, int sectors);
  87 KTR_INFO(KTR_DMCRYPT, dmcrypt, crypto_cb_read_done, 2,
  88     "crypto_cb_read_done(crp = %p, bp = %p, n = %d)",
  89     struct cryptop *crp, struct buf *bp, int n);
  90
  91 struct target_crypt_config;
  92
  93 typedef void dispatch_t(void *);
  94 typedef void ivgen_t(struct target_crypt_config *, u_int8_t *, size_t, off_t,
  95     void *);
  96
  97 typedef int ivgen_ctor_t(struct target_crypt_config *, char *, void **);
  98 typedef int ivgen_dtor_t(struct target_crypt_config *, void *);
  99
 100 struct iv_generator {
 101         const char      *name;
 102         ivgen_ctor_t    *ctor;
 103         ivgen_dtor_t    *dtor;
 104         ivgen_t         *gen_iv;
 105 };
 106
 107 struct essiv_ivgen_priv {
 108         struct cryptoini        crypto_session;
 109         struct objcache *crp_crd_cache;
 110         u_int64_t       crypto_sid;
 111         size_t          keyhash_len;
 112         u_int8_t        crypto_keyhash[SHA512_DIGEST_LENGTH];
 113 };
 114
 115 typedef struct target_crypt_config {
 116         size_t  params_len;
 117         dm_pdev_t *pdev;
 118         char    *status_str;
 119         int     crypto_alg;
 120         int     crypto_klen;
 121         u_int8_t        crypto_key[512>>3];
 122
 123         u_int64_t       crypto_sid;
 124         u_int64_t       block_offset;
 125         int64_t         iv_offset;
 126         SHA512_CTX      essivsha512_ctx;
 127
 128         struct cryptoini        crypto_session;
 129
 130         struct iv_generator     *ivgen;
 131         void    *ivgen_priv;
 132
 133         struct malloc_pipe      read_mpipe;
 134         struct malloc_pipe      write_mpipe;
 135 } dm_target_crypt_config_t;
 136
 137 struct dmtc_helper {
 138         dm_target_crypt_config_t *priv;
 139         caddr_t free_addr;
 140         caddr_t orig_buf;
 141         caddr_t data_buf;
 142 };
 143
 144 struct dmtc_dump_helper {
 145         dm_target_crypt_config_t *priv;
 146         void *data;
 147         size_t length;
 148         off_t offset;
 149
 150         int sectors;
 151         int *ident;
 152
 153         struct cryptodesc crd[128];
 154         struct cryptop crp[128];
 155         u_char space[65536];
 156 };
 157
 158 #define DMTC_BUF_SIZE_WRITE \
 159     MAXPHYS + sizeof(struct dmtc_helper) + \
 160     MAXPHYS/DEV_BSIZE*(sizeof(struct cryptop) + sizeof(struct cryptodesc))
 161 #define DMTC_BUF_SIZE_READ \
 162     sizeof(struct dmtc_helper) + \
 163     MAXPHYS/DEV_BSIZE*(sizeof(struct cryptop) + sizeof(struct cryptodesc))
 164
 165 static void dmtc_crypto_dispatch(void *arg);
 166 static void dmtc_crypto_dump_start(dm_target_crypt_config_t *priv,
 167                                 struct dmtc_dump_helper *dump_helper);
 168 static void dmtc_crypto_read_start(dm_target_crypt_config_t *priv,
 169                                 struct bio *bio);
 170 static void dmtc_crypto_write_start(dm_target_crypt_config_t *priv,
 171                                 struct bio *bio);
 172 static void dmtc_bio_read_done(struct bio *bio);
 173 static void dmtc_bio_write_done(struct bio *bio);
 174 static int dmtc_crypto_cb_dump_done(struct cryptop *crp);
 175 static int dmtc_crypto_cb_read_done(struct cryptop *crp);
 176 static int dmtc_crypto_cb_write_done(struct cryptop *crp);
 177
 178 static ivgen_ctor_t     essiv_ivgen_ctor;
 179 static ivgen_dtor_t     essiv_ivgen_dtor;
 180 static ivgen_t          essiv_ivgen;
 181 static ivgen_t          plain_ivgen;
 182 static ivgen_t          plain64_ivgen;
 183
 184 static struct iv_generator ivgens[] = {
 185         { .name = "essiv", .ctor = essiv_ivgen_ctor, .dtor = essiv_ivgen_dtor,
 186             .gen_iv = essiv_ivgen },
 187         { .name = "plain", .ctor = NULL, .dtor = NULL, .gen_iv = plain_ivgen },
 188         { .name = "plain64", .ctor = NULL, .dtor = NULL, .gen_iv = plain64_ivgen },
 189         { NULL, NULL, NULL, NULL }
 190 };
 191
 192 struct objcache_malloc_args essiv_ivgen_malloc_args = {
 193                 2*sizeof(void *) + (sizeof(struct cryptodesc) +
 194                 sizeof(struct cryptop)), M_DMCRYPT };
 195
 196 static void
 197 dmtc_init_mpipe(struct target_crypt_config *priv)
 198 {
 199         int nmax;
 200
 201         nmax = (physmem*2/1000*PAGE_SIZE)/(DMTC_BUF_SIZE_WRITE + DMTC_BUF_SIZE_READ) + 1;
 202
 203         if (nmax < 2)
 204                 nmax = 2;
 205
 206         kprintf("dm_target_crypt: Setting min/max mpipe buffers: %d/%d\n", 2, nmax);
 207
 208         mpipe_init(&priv->write_mpipe, M_DMCRYPT, DMTC_BUF_SIZE_WRITE,
 209                    2, nmax, MPF_NOZERO | MPF_CALLBACK, NULL, NULL, NULL);
 210         mpipe_init(&priv->read_mpipe, M_DMCRYPT, DMTC_BUF_SIZE_READ,
 211                    2, nmax, MPF_NOZERO | MPF_CALLBACK, NULL, NULL, NULL);
 212 }
 213
 214 static void
 215 dmtc_destroy_mpipe(struct target_crypt_config *priv)
 216 {
 217         mpipe_done(&priv->write_mpipe);
 218         mpipe_done(&priv->read_mpipe);
 219 }
 220
 221 /*
 222  * Overwrite private information (in buf) to avoid leaking it
 223  */
 224 static void
 225 dmtc_crypto_clear(void *buf, size_t len)
 226 {
 227         memset(buf, 0xFF, len);
 228         bzero(buf, len);
 229 }
 230
 231 /*
 232  * ESSIV IV Generator Routines
 233  */
 234 static int
 235 essiv_ivgen_ctor(struct target_crypt_config *priv, char *iv_hash, void **p_ivpriv)
 236 {
 237         struct essiv_ivgen_priv *ivpriv;
 238         u_int8_t crypto_keyhash[SHA512_DIGEST_LENGTH];
 239         unsigned int klen, hashlen;
 240         int error;
 241
 242         klen = (priv->crypto_klen >> 3);
 243
 244         if (iv_hash == NULL)
 245                 return EINVAL;
 246
 247         if (!strcmp(iv_hash, "sha1")) {
 248                 SHA1_CTX ctx;
 249
 250                 hashlen = SHA1_RESULTLEN;
 251                 SHA1Init(&ctx);
 252                 SHA1Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 253                 SHA1Final(crypto_keyhash, &ctx);
 254         } else if (!strcmp(iv_hash, "sha256")) {
 255                 SHA256_CTX ctx;
 256
 257                 hashlen = SHA256_DIGEST_LENGTH;
 258                 SHA256_Init(&ctx);
 259                 SHA256_Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 260                 SHA256_Final(crypto_keyhash, &ctx);
 261         } else if (!strcmp(iv_hash, "sha384")) {
 262                 SHA384_CTX ctx;
 263
 264                 hashlen = SHA384_DIGEST_LENGTH;
 265                 SHA384_Init(&ctx);
 266                 SHA384_Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 267                 SHA384_Final(crypto_keyhash, &ctx);
 268         } else if (!strcmp(iv_hash, "sha512")) {
 269                 SHA512_CTX ctx;
 270
 271                 hashlen = SHA512_DIGEST_LENGTH;
 272                 SHA512_Init(&ctx);
 273                 SHA512_Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 274                 SHA512_Final(crypto_keyhash, &ctx);
 275         } else if (!strcmp(iv_hash, "md5")) {
 276                 MD5_CTX ctx;
 277
 278                 hashlen = MD5_DIGEST_LENGTH;
 279                 MD5Init(&ctx);
 280                 MD5Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 281                 MD5Final(crypto_keyhash, &ctx);
 282         } else if (!strcmp(iv_hash, "rmd160") ||
 283                    !strcmp(iv_hash, "ripemd160")) {
 284                 RMD160_CTX ctx;
 285
 286                 hashlen = 160/8;
 287                 RMD160Init(&ctx);
 288                 RMD160Update(&ctx, priv->crypto_key, priv->crypto_klen>>3);
 289                 RMD160Final(crypto_keyhash, &ctx);
 290         } else {
 291                 return EINVAL;
 292         }
 293
 294         /* Convert hashlen to bits */
 295         hashlen <<= 3;
 296
 297         ivpriv = kmalloc(sizeof(struct essiv_ivgen_priv), M_DMCRYPT,
 298             M_WAITOK | M_ZERO);
 299         memcpy(ivpriv->crypto_keyhash, crypto_keyhash, sizeof(crypto_keyhash));
 300         ivpriv->keyhash_len = sizeof(crypto_keyhash);
 301         dmtc_crypto_clear(crypto_keyhash, sizeof(crypto_keyhash));
 302
 303         ivpriv->crypto_session.cri_alg = priv->crypto_alg;
 304         ivpriv->crypto_session.cri_key = (u_int8_t *)ivpriv->crypto_keyhash;
 305         ivpriv->crypto_session.cri_klen = hashlen;
 306         ivpriv->crypto_session.cri_mlen = 0;
 307         ivpriv->crypto_session.cri_next = NULL;
 308
 309         /*
 310          * XXX: in principle we also need to check if the block size of the
 311          *      cipher is a valid iv size for the block cipher.
 312          */
 313
 314         error = crypto_newsession(&ivpriv->crypto_sid,
 315                                   &ivpriv->crypto_session,
 316                                   CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
 317         if (error) {
 318                 kprintf("dm_target_crypt: Error during crypto_newsession "
 319                         "for essiv_ivgen, error = %d\n",
 320                         error);
 321                 dmtc_crypto_clear(ivpriv->crypto_keyhash, ivpriv->keyhash_len);
 322                 kfree(ivpriv, M_DMCRYPT);
 323                 return ENOTSUP;
 324         }
 325
 326         ivpriv->crp_crd_cache = objcache_create(
 327             "dmcrypt-essiv-cache", 0, 0,
 328             NULL, NULL, NULL,
 329             objcache_malloc_alloc,
 330             objcache_malloc_free,
 331             &essiv_ivgen_malloc_args );
 332
 333         *p_ivpriv = ivpriv;
 334         return 0;
 335 }
 336
 337 static int
 338 essiv_ivgen_dtor(struct target_crypt_config *priv, void *arg)
 339 {
 340         struct essiv_ivgen_priv *ivpriv;
 341
 342         ivpriv = (struct essiv_ivgen_priv *)arg;
 343         KKASSERT(ivpriv != NULL);
 344
 345         crypto_freesession(ivpriv->crypto_sid);
 346
 347         objcache_destroy(ivpriv->crp_crd_cache);
 348
 349         dmtc_crypto_clear(ivpriv->crypto_keyhash, ivpriv->keyhash_len);
 350         kfree(ivpriv, M_DMCRYPT);
 351
 352         return 0;
 353 }
 354
 355 static int
 356 essiv_ivgen_done(struct cryptop *crp)
 357 {
 358         struct essiv_ivgen_priv *ivpriv;
 359         void *free_addr;
 360         void *opaque;
 361
 362
 363         if (crp->crp_etype == EAGAIN)
 364                 return crypto_dispatch(crp);
 365
 366         if (crp->crp_etype != 0) {
 367                 kprintf("dm_target_crypt: essiv_ivgen_done, "
 368                         "crp->crp_etype = %d\n", crp->crp_etype);
 369         }
 370
 371         free_addr = crp->crp_opaque;
 372         /*
 373          * In-memory structure is:
 374          * |  ivpriv  |  opaque  |     crp     |      crd      |
 375          * | (void *) | (void *) |   (cryptop) |  (cryptodesc) |
 376          */
 377         ivpriv = *((struct essiv_ivgen_priv **)crp->crp_opaque);
 378         crp->crp_opaque += sizeof(void *);
 379         opaque = *((void **)crp->crp_opaque);
 380
 381         objcache_put(ivpriv->crp_crd_cache, free_addr);
 382         dmtc_crypto_dispatch(opaque);
 383         return 0;
 384 }
 385
 386 static void
 387 essiv_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 388             size_t iv_len, off_t sector, void *opaque)
 389 {
 390         struct essiv_ivgen_priv *ivpriv;
 391         struct cryptodesc *crd;
 392         struct cryptop *crp;
 393         caddr_t space, alloc_addr;
 394         int error;
 395
 396         ivpriv = priv->ivgen_priv;
 397         KKASSERT(ivpriv != NULL);
 398
 399         /*
 400          * In-memory structure is:
 401          * |  ivpriv  |  opaque  |     crp     |      crd      |
 402          * | (void *) | (void *) |   (cryptop) |  (cryptodesc) |
 403          */
 404         alloc_addr = space = objcache_get(ivpriv->crp_crd_cache, M_WAITOK);
 405         *((struct essiv_ivgen_priv **)space) = ivpriv;
 406         space += sizeof(void *);
 407         *((void **)space) = opaque;
 408         space += sizeof(void *);
 409         crp = (struct cryptop *)space;
 410         space += sizeof(struct cryptop);
 411         crd = (struct cryptodesc *)space;
 412
 413         bzero(iv, iv_len);
 414         bzero(crd, sizeof(struct cryptodesc));
 415         bzero(crp, sizeof(struct cryptop));
 416         *((off_t *)iv) = htole64(sector + priv->iv_offset);
 417         crp->crp_buf = (caddr_t)iv;
 418
 419         crp->crp_sid = ivpriv->crypto_sid;
 420         crp->crp_ilen = crp->crp_olen = iv_len;
 421
 422         crp->crp_opaque = alloc_addr;
 423
 424         crp->crp_callback = essiv_ivgen_done;
 425
 426         crp->crp_desc = crd;
 427         crp->crp_etype = 0;
 428         crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL | CRYPTO_F_BATCH;
 429
 430         crd->crd_alg = priv->crypto_alg;
 431 #if 0
 432         crd->crd_key = (caddr_t)priv->crypto_keyhash;
 433         crd->crd_klen = priv->crypto_klen;
 434 #endif
 435
 436         bzero(crd->crd_iv, sizeof(crd->crd_iv));
 437
 438         crd->crd_skip = 0;
 439         crd->crd_len = iv_len;
 440         crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
 441         crd->crd_flags |= CRD_F_ENCRYPT;
 442         crd->crd_next = NULL;
 443
 444         error = crypto_dispatch(crp);
 445         if (error)
 446                 kprintf("dm_target_crypt: essiv_ivgen, error = %d\n", error);
 447 }
 448
 449
 450 static void
 451 plain_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 452             size_t iv_len, off_t sector, void *opaque)
 453 {
 454         bzero(iv, iv_len);
 455         *((uint32_t *)iv) = htole32((uint32_t)(sector + priv->iv_offset));
 456         dmtc_crypto_dispatch(opaque);
 457 }
 458
 459 static void
 460 plain64_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 461     size_t iv_len, off_t sector, void *opaque)
 462 {
 463         bzero(iv, iv_len);
 464         *((uint64_t *)iv) = htole64((uint64_t)(sector + priv->iv_offset));
 465         dmtc_crypto_dispatch(opaque);
 466 }
 467
 468 #if 0
 469 static void
 470 geli_ivgen(dm_target_crypt_config_t *priv, u_int8_t *iv,
 471            size_t iv_len, off_t sector, void *opaque)
 472 {
 473
 474         SHA512_CTX      ctx512;
 475         u_int8_t        md[SHA512_DIGEST_LENGTH]; /* Max. Digest Size */
 476
 477         memcpy(&ctx512, &priv->essivsha512_ctx, sizeof(SHA512_CTX));
 478         SHA512_Update(&ctx512, (u_int8_t*)&sector, sizeof(off_t));
 479         SHA512_Final(md, &ctx512);
 480
 481         memcpy(iv, md, iv_len);
 482         dmtc_crypto_dispatch(opaque);
 483 }
 484 #endif
 485
 486 /*
 487  * Init function called from dm_table_load_ioctl.
 488  * cryptsetup actually passes us this:
 489  * aes-cbc-essiv:sha256 7997f8af... 0 /dev/ad0s0a 8
 490  */
 491 static int
 492 hex2key(char *hex, size_t key_len, u_int8_t *key)
 493 {
 494         char hex_buf[3];
 495         size_t key_idx;
 496
 497         hex_buf[2] = 0;
 498         for (key_idx = 0; key_idx < key_len; ++key_idx) {
 499                 hex_buf[0] = *hex++;
 500                 hex_buf[1] = *hex++;
 501                 key[key_idx] = (u_int8_t)strtoul(hex_buf, NULL, 16);
 502         }
 503         hex_buf[0] = 0;
 504         hex_buf[1] = 0;
 505
 506         return 0;
 507 }
 508
 509 static int
 510 dm_target_crypt_init(dm_dev_t * dmv, void **target_config, char *params)
 511 {
 512         dm_target_crypt_config_t *priv;
 513         size_t len;
 514         char **ap, *args[5];
 515         char *crypto_alg, *crypto_mode, *iv_mode, *iv_opt, *key, *dev;
 516         char *status_str;
 517         int i, argc, klen, error;
 518         uint64_t iv_offset, block_offset;
 519
 520         if (params == NULL)
 521                 return EINVAL;
 522
 523         len = strlen(params) + 1;
 524         argc = 0;
 525
 526         status_str = kmalloc(len, M_DMCRYPT, M_WAITOK);
 527         /*
 528          * Parse a string, containing tokens delimited by white space,
 529          * into an argument vector
 530          */
 531         for (ap = args; ap < &args[5] &&
 532             (*ap = strsep(&params, " \t")) != NULL;) {
 533                 if (**ap != '\0') {
 534                         argc++;
 535                         ap++;
 536                 }
 537         }
 538
 539         if (argc != 5) {
 540                 kprintf("dm_target_crypt: not enough arguments, "
 541                         "need exactly 5\n");
 542                 kfree(status_str, M_DMCRYPT);
 543                 return ENOMEM; /* XXX */
 544         }
 545
 546         crypto_alg = strsep(&args[0], "-");
 547         crypto_mode = strsep(&args[0], "-");
 548         iv_opt = strsep(&args[0], "-");
 549         iv_mode = strsep(&iv_opt, ":");
 550         key = args[1];
 551         iv_offset = strtouq(args[2], NULL, 0);
 552         dev = args[3];
 553         block_offset = strtouq(args[4], NULL, 0);
 554         /* bits / 8 = bytes, 1 byte = 2 hexa chars, so << 2 */
 555         klen = strlen(key) << 2;
 556
 557 #if 0
 558         kprintf("dm_target_crypt - new: dev=%s, crypto_alg=%s, crypto_mode=%s, "
 559                 "iv_mode=%s, iv_opt=%s, key=%s, iv_offset=%ju, "
 560                 "block_offset=%ju\n",
 561                 dev, crypto_alg, crypto_mode, iv_mode, iv_opt, key, iv_offset,
 562                 block_offset);
 563 #endif
 564
 565         priv = kmalloc(sizeof(dm_target_crypt_config_t), M_DMCRYPT, M_WAITOK);
 566
 567         /* Insert dmp to global pdev list */
 568         if ((priv->pdev = dm_pdev_insert(dev)) == NULL) {
 569                 kprintf("dm_target_crypt: dm_pdev_insert failed\n");
 570                 kfree(status_str, M_DMCRYPT);
 571                 return ENOENT;
 572         }
 573
 574         /*
 575          * This code checks for valid combinations of algorithm and mode.
 576          * Currently supported options are:
 577          *
 578          * *-cbc
 579          * aes-xts
 580          * twofish-xts
 581          * serpent-xts
 582          */
 583         if ((strcmp(crypto_mode, "cbc") != 0) &&
 584             !((strcmp(crypto_mode, "xts") == 0) &&
 585             ((strcmp(crypto_alg, "aes") == 0) ||
 586             (strcmp(crypto_alg, "twofish") == 0) ||
 587             (strcmp(crypto_alg, "serpent") == 0))))
 588         {
 589                 kprintf("dm_target_crypt: only support 'cbc' chaining mode,"
 590                     " aes-xts, twofish-xts and serpent-xts, "
 591                     "invalid mode '%s-%s'\n",
 592                     crypto_alg, crypto_mode);
 593                 goto notsup;
 594         }
 595
 596         if (!strcmp(crypto_alg, "aes")) {
 597                 if (!strcmp(crypto_mode, "xts")) {
 598                         priv->crypto_alg = CRYPTO_AES_XTS;
 599                         if (klen != 256 && klen != 512)
 600                                 goto notsup;
 601                 } else if (!strcmp(crypto_mode, "cbc")) {
 602                         priv->crypto_alg = CRYPTO_AES_CBC;
 603                         if (klen != 128 && klen != 192 && klen != 256)
 604                                 goto notsup;
 605                 } else {
 606                         goto notsup;
 607                 }
 608                 priv->crypto_klen = klen;
 609         } else if (!strcmp(crypto_alg, "twofish")) {
 610                 if (!strcmp(crypto_mode, "xts")) {
 611                         priv->crypto_alg = CRYPTO_TWOFISH_XTS;
 612                         if (klen != 256 && klen != 512)
 613                                 goto notsup;
 614                 } else if (!strcmp(crypto_mode, "cbc")) {
 615                         priv->crypto_alg = CRYPTO_TWOFISH_CBC;
 616                         if (klen != 128 && klen != 192 && klen != 256)
 617                                 goto notsup;
 618                 } else {
 619                         goto notsup;
 620                 }
 621                 priv->crypto_klen = klen;
 622         } else if (!strcmp(crypto_alg, "serpent")) {
 623                 if (!strcmp(crypto_mode, "xts")) {
 624                         priv->crypto_alg = CRYPTO_SERPENT_XTS;
 625                         if (klen != 256 && klen != 512)
 626                                 goto notsup;
 627                 } else if (!strcmp(crypto_mode, "cbc")) {
 628                         priv->crypto_alg = CRYPTO_SERPENT_CBC;
 629                         if (klen != 128 && klen != 192 && klen != 256)
 630                                 goto notsup;
 631                 } else {
 632                         goto notsup;
 633                 }
 634                 priv->crypto_klen = klen;
 635         } else if (!strcmp(crypto_alg, "blowfish")) {
 636                 priv->crypto_alg = CRYPTO_BLF_CBC;
 637                 if (klen < 128 || klen > 448 || (klen % 8) != 0)
 638                         goto notsup;
 639                 priv->crypto_klen = klen;
 640         } else if (!strcmp(crypto_alg, "3des") ||
 641                    !strncmp(crypto_alg, "des3", 4)) {
 642                 priv->crypto_alg = CRYPTO_3DES_CBC;
 643                 if (klen != 168)
 644                         goto notsup;
 645                 priv->crypto_klen = 168;
 646         } else if (!strcmp(crypto_alg, "camellia")) {
 647                 priv->crypto_alg = CRYPTO_CAMELLIA_CBC;
 648                 if (klen != 128 && klen != 192 && klen != 256)
 649                         goto notsup;
 650                 priv->crypto_klen = klen;
 651         } else if (!strcmp(crypto_alg, "skipjack")) {
 652                 priv->crypto_alg = CRYPTO_SKIPJACK_CBC;
 653                 if (klen != 80)
 654                         goto notsup;
 655                 priv->crypto_klen = 80;
 656         } else if (!strcmp(crypto_alg, "cast5")) {
 657                 priv->crypto_alg = CRYPTO_CAST_CBC;
 658                 if (klen != 128)
 659                         goto notsup;
 660                 priv->crypto_klen = 128;
 661         } else if (!strcmp(crypto_alg, "null")) {
 662                 priv->crypto_alg = CRYPTO_NULL_CBC;
 663                 if (klen != 128)
 664                         goto notsup;
 665                 priv->crypto_klen = 128;
 666         } else {
 667                 kprintf("dm_target_crypt: Unsupported crypto algorithm: %s\n",
 668                         crypto_alg);
 669                 goto notsup;
 670         }
 671
 672         /* Save length of param string */
 673         priv->params_len = len;
 674         priv->block_offset = block_offset;
 675         priv->iv_offset = iv_offset - block_offset;
 676
 677         *target_config = priv;
 678
 679         dmv->dev_type = DM_CRYPTO_DEV;
 680
 681         error = hex2key(key, priv->crypto_klen >> 3,
 682                         (u_int8_t *)priv->crypto_key);
 683
 684         if (error) {
 685                 kprintf("dm_target_crypt: hex2key failed, "
 686                         "invalid key format\n");
 687                 goto notsup;
 688         }
 689
 690         /* Handle cmd */
 691         for(i = 0; ivgens[i].name != NULL; i++) {
 692                 if (!strcmp(iv_mode, ivgens[i].name))
 693                         break;
 694         }
 695
 696         if (ivgens[i].name == NULL) {
 697                 kprintf("dm_target_crypt: iv_mode='%s' unsupported\n",
 698                         iv_mode);
 699                 goto notsup;
 700         }
 701
 702         /* Call our ivgen constructor */
 703         if (ivgens[i].ctor != NULL) {
 704                 error = ivgens[i].ctor(priv, iv_opt,
 705                     &priv->ivgen_priv);
 706                 if (error) {
 707                         kprintf("dm_target_crypt: ctor for '%s' failed\n",
 708                             ivgens[i].name);
 709                         goto notsup;
 710                 }
 711         }
 712
 713         priv->ivgen = &ivgens[i];
 714
 715         priv->crypto_session.cri_alg = priv->crypto_alg;
 716         priv->crypto_session.cri_key = (u_int8_t *)priv->crypto_key;
 717         priv->crypto_session.cri_klen = priv->crypto_klen;
 718         priv->crypto_session.cri_mlen = 0;
 719         priv->crypto_session.cri_next = NULL;
 720
 721         error = crypto_newsession(&priv->crypto_sid,
 722                                   &priv->crypto_session,
 723                                   CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE);
 724         if (error) {
 725                 kprintf("dm_target_crypt: Error during crypto_newsession, "
 726                         "error = %d\n",
 727                         error);
 728                 goto notsup;
 729         }
 730
 731         memset(key, '0', strlen(key));
 732         if (iv_opt) {
 733                 ksprintf(status_str, "%s-%s-%s:%s %s %ju %s %ju",
 734                     crypto_alg, crypto_mode, iv_mode, iv_opt,
 735                     key, iv_offset, dev, block_offset);
 736         } else {
 737                 ksprintf(status_str, "%s-%s-%s %s %ju %s %ju",
 738                     crypto_alg, crypto_mode, iv_mode,
 739                     key, iv_offset, dev, block_offset);
 740         }
 741         priv->status_str = status_str;
 742
 743         /* Initialize mpipes */
 744         dmtc_init_mpipe(priv);
 745
 746         return 0;
 747
 748 notsup:
 749         kprintf("dm_target_crypt: ENOTSUP\n");
 750         kfree(status_str, M_DMCRYPT);
 751         return ENOTSUP;
 752 }
 753
 754 /* Status routine called to get params string. */
 755 static char *
 756 dm_target_crypt_status(void *target_config)
 757 {
 758         dm_target_crypt_config_t *priv;
 759         char *params;
 760
 761         priv = target_config;
 762
 763         /* caller expects use of M_DM */
 764         params = kmalloc(DM_MAX_PARAMS_SIZE, M_DM, M_WAITOK);
 765
 766         ksnprintf(params, DM_MAX_PARAMS_SIZE, "%s",
 767             priv->status_str);
 768
 769         return params;
 770 }
 771
 772 static int
 773 dm_target_crypt_destroy(dm_table_entry_t * table_en)
 774 {
 775         dm_target_crypt_config_t *priv;
 776
 777         /*
 778          * Disconnect the crypt config before unbusying the target.
 779          */
 780         priv = table_en->target_config;
 781         if (priv == NULL)
 782                 return 0;
 783         table_en->target_config = NULL;
 784         dm_pdev_decr(priv->pdev);
 785
 786         /*
 787          * Clean up the crypt config
 788          *
 789          * Overwrite the private information before freeing memory to
 790          * avoid leaking it.
 791          */
 792         if (priv->status_str) {
 793                 dmtc_crypto_clear(priv->status_str, strlen(priv->status_str));
 794                 kfree(priv->status_str, M_DMCRYPT);
 795                 crypto_freesession(priv->crypto_sid);
 796         }
 797
 798         if ((priv->ivgen) && (priv->ivgen->dtor != NULL)) {
 799                 priv->ivgen->dtor(priv, priv->ivgen_priv);
 800         }
 801
 802         /* Destroy mpipes */
 803         dmtc_destroy_mpipe(priv);
 804
 805         dmtc_crypto_clear(priv, sizeof(dm_target_crypt_config_t));
 806         kfree(priv, M_DMCRYPT);
 807
 808         return 0;
 809 }
 810
 811 static int
 812 dm_target_crypt_deps(dm_table_entry_t * table_en, prop_array_t prop_array)
 813 {
 814         dm_target_crypt_config_t *priv;
 815         struct vattr va;
 816
 817         int error;
 818
 819         if (table_en->target_config == NULL)
 820                 return ENOENT;
 821
 822         priv = table_en->target_config;
 823
 824         if ((error = VOP_GETATTR(priv->pdev->pdev_vnode, &va)) != 0)
 825                 return error;
 826
 827         prop_array_add_uint64(prop_array,
 828                               (uint64_t)makeudev(va.va_rmajor, va.va_rminor));
 829
 830         return 0;
 831 }
 832
 833 /* Unsupported for this target. */
 834 static int
 835 dm_target_crypt_upcall(dm_table_entry_t * table_en, struct buf * bp)
 836 {
 837         return 0;
 838 }
 839
 840 /************************************************************************
 841  *                      STRATEGY SUPPORT FUNCTIONS                      *
 842  ************************************************************************
 843  *
 844  * READ PATH:   doio -> bio_read_done -> crypto_work -> crypto_cb_read_done
 845  * WRITE PATH:  crypto_work -> crypto_cb_write_done -> doio -> bio_write_done
 846  */
 847
 848 /*
 849  * Wrapper around crypto_dispatch() to match dispatch_t type
 850  */
 851 static void
 852 dmtc_crypto_dispatch(void *arg)
 853 {
 854         struct cryptop *crp;
 855
 856         crp = (struct cryptop *)arg;
 857         KKASSERT(crp != NULL);
 858         KTR_LOG(dmcrypt_crypto_dispatch, crp);
 859         crypto_dispatch(crp);
 860 }
 861
 862 /*
 863  * Start IO operation, called from dmstrategy routine.
 864  */
 865 static int
 866 dm_target_crypt_strategy(dm_table_entry_t *table_en, struct buf *bp)
 867 {
 868         struct bio *bio;
 869
 870         dm_target_crypt_config_t *priv;
 871         priv = table_en->target_config;
 872
 873         /* Get rid of stuff we can't really handle */
 874         if ((bp->b_cmd == BUF_CMD_READ) || (bp->b_cmd == BUF_CMD_WRITE)) {
 875                 if (((bp->b_bcount % DEV_BSIZE) != 0) || (bp->b_bcount == 0)) {
 876                         kprintf("dm_target_crypt_strategy: can't really "
 877                                 "handle bp->b_bcount = %d\n",
 878                                 bp->b_bcount);
 879                         bp->b_error = EINVAL;
 880                         bp->b_flags |= B_ERROR | B_INVAL;
 881                         biodone(&bp->b_bio1);
 882                         return 0;
 883                 }
 884         }
 885
 886         KTR_LOG(dmcrypt_crypt_strategy, bp->b_cmd, bp);
 887
 888         switch (bp->b_cmd) {
 889         case BUF_CMD_READ:
 890                 bio = push_bio(&bp->b_bio1);
 891                 bio->bio_offset = bp->b_bio1.bio_offset +
 892                                   priv->block_offset * DEV_BSIZE;
 893                 bio->bio_caller_info1.ptr = priv;
 894                 bio->bio_done = dmtc_bio_read_done;
 895                 vn_strategy(priv->pdev->pdev_vnode, bio);
 896                 break;
 897         case BUF_CMD_WRITE:
 898                 bio = push_bio(&bp->b_bio1);
 899                 bio->bio_offset = bp->b_bio1.bio_offset +
 900                                   priv->block_offset * DEV_BSIZE;
 901                 bio->bio_caller_info1.ptr = priv;
 902                 dmtc_crypto_write_start(priv, bio);
 903                 break;
 904         default:
 905                 vn_strategy(priv->pdev->pdev_vnode, &bp->b_bio1);
 906                 break;
 907         }
 908         return 0;
 909 }
 910
 911 /*
 912  * STRATEGY READ PATH PART 1/3 (after read BIO completes)
 913  */
 914 static void
 915 dmtc_bio_read_done(struct bio *bio)
 916 {
 917         struct bio *obio;
 918
 919         dm_target_crypt_config_t *priv;
 920
 921         KTR_LOG(dmcrypt_bio_read_done, bio->bio_buf);
 922
 923         /*
 924          * If a read error occurs we shortcut the operation, otherwise
 925          * go on to stage 2.
 926          */
 927         if (bio->bio_buf->b_flags & B_ERROR) {
 928                 obio = pop_bio(bio);
 929                 biodone(obio);
 930         } else {
 931                 priv = bio->bio_caller_info1.ptr;
 932                 dmtc_crypto_read_start(priv, bio);
 933         }
 934 }
 935
 936 /*
 937  * STRATEGY READ PATH PART 2/3
 938  */
 939 static void
 940 dmtc_crypto_read_retry(void *arg1, void *arg2)
 941 {
 942         dm_target_crypt_config_t *priv = arg1;
 943         struct bio *bio = arg2;
 944
 945         dmtc_crypto_read_start(priv, bio);
 946 }
 947
 948 static void
 949 dmtc_crypto_read_start(dm_target_crypt_config_t *priv, struct bio *bio)
 950 {
 951         struct dmtc_helper *dmtc;
 952         struct cryptodesc *crd;
 953         struct cryptop *crp;
 954         struct cryptoini *cri;
 955         int i, bytes, sectors, sz;
 956         off_t isector;
 957         u_char *ptr, *space;
 958
 959         cri = &priv->crypto_session;
 960
 961         /*
 962          * Note: b_resid no good after read I/O, it will be 0, use
 963          *       b_bcount.
 964          */
 965         bytes = bio->bio_buf->b_bcount;
 966         isector = bio->bio_offset / DEV_BSIZE;  /* ivgen salt base? */
 967         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
 968         sz = sectors * (sizeof(*crp) + sizeof(*crd));
 969
 970         /*
 971          * For reads with bogus page we can't decrypt in place as stuff
 972          * can get ripped out from under us.
 973          *
 974          * XXX actually it looks like we can, and in any case the initial
 975          * read already completed and threw crypted data into the buffer
 976          * cache buffer.  Disable for now.
 977          */
 978         space = mpipe_alloc_callback(&priv->read_mpipe,
 979                                      dmtc_crypto_read_retry, priv, bio);
 980         if (space == NULL)
 981                 return;
 982
 983         dmtc = (struct dmtc_helper *)space;
 984         dmtc->free_addr = space;
 985         space += sizeof(struct dmtc_helper);
 986         dmtc->orig_buf = NULL;
 987         dmtc->data_buf = bio->bio_buf->b_data;
 988         dmtc->priv = priv;
 989         bio->bio_caller_info2.ptr = dmtc;
 990         bio->bio_buf->b_error = 0;
 991
 992         /*
 993          * Load crypto descriptors (crp/crd loop)
 994          */
 995         bzero(space, sz);
 996         ptr = space;
 997         bio->bio_caller_info3.value = sectors;
 998         cpu_sfence();
 999 #if 0
1000         kprintf("Read, bytes = %d (b_bcount), "
1001                 "sectors = %d (bio = %p, b_cmd = %d)\n",
1002                 bytes, sectors, bio, bio->bio_buf->b_cmd);
1003 #endif
1004         for (i = 0; i < sectors; i++) {
1005                 crp = (struct cryptop *)ptr;
1006                 ptr += sizeof(*crp);
1007                 crd = (struct cryptodesc *)ptr;
1008                 ptr += sizeof (*crd);
1009
1010                 crp->crp_buf = dmtc->data_buf + i * DEV_BSIZE;
1011
1012                 crp->crp_sid = priv->crypto_sid;
1013                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
1014
1015                 crp->crp_opaque = (void *)bio;
1016
1017                 crp->crp_callback = dmtc_crypto_cb_read_done;
1018                 crp->crp_desc = crd;
1019                 crp->crp_etype = 0;
1020                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
1021                                  CRYPTO_F_BATCH;
1022
1023                 crd->crd_alg = priv->crypto_alg;
1024 #if 0
1025                 crd->crd_key = (caddr_t)priv->crypto_key;
1026                 crd->crd_klen = priv->crypto_klen;
1027 #endif
1028
1029                 crd->crd_skip = 0;
1030                 crd->crd_len = DEV_BSIZE /* XXX */;
1031                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
1032                 crd->crd_next = NULL;
1033
1034                 crd->crd_flags &= ~CRD_F_ENCRYPT;
1035
1036                 KTR_LOG(dmcrypt_crypto_read_start, crp, bio->bio_buf, i,
1037                     sectors);
1038
1039                 /*
1040                  * Note: last argument is used to generate salt(?) and is
1041                  *       a 64 bit value, but the original code passed an
1042                  *       int.  Changing it now will break pre-existing
1043                  *       crypt volumes.
1044                  */
1045                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
1046                                     isector + i, crp);
1047         }
1048 }
1049
1050 /*
1051  * STRATEGY READ PATH PART 3/3
1052  */
1053 static int
1054 dmtc_crypto_cb_read_done(struct cryptop *crp)
1055 {
1056         struct dmtc_helper *dmtc;
1057         struct bio *bio, *obio;
1058         int n;
1059
1060         if (crp->crp_etype == EAGAIN)
1061                 return crypto_dispatch(crp);
1062
1063         bio = (struct bio *)crp->crp_opaque;
1064         KKASSERT(bio != NULL);
1065
1066         /*
1067          * Cumulative error
1068          */
1069         if (crp->crp_etype) {
1070                 kprintf("dm_target_crypt: dmtc_crypto_cb_read_done "
1071                         "crp_etype = %d\n",
1072                         crp->crp_etype);
1073                 bio->bio_buf->b_error = crp->crp_etype;
1074         }
1075
1076         /*
1077          * On the last chunk of the decryption we do any required copybacks
1078          * and complete the I/O.
1079          */
1080         n = atomic_fetchadd_int(&bio->bio_caller_info3.value, -1);
1081 #if 0
1082         kprintf("dmtc_crypto_cb_read_done %p, n = %d\n", bio, n);
1083 #endif
1084
1085         KTR_LOG(dmcrypt_crypto_cb_read_done, crp, bio->bio_buf, n);
1086
1087         if (n == 1) {
1088                 /*
1089                  * For the B_HASBOGUS case we didn't decrypt in place,
1090                  * so we need to copy stuff back into the buf.
1091                  *
1092                  * (disabled for now).
1093                  */
1094                 dmtc = bio->bio_caller_info2.ptr;
1095                 if (bio->bio_buf->b_error) {
1096                         bio->bio_buf->b_flags |= B_ERROR;
1097                 }
1098 #if 0
1099                 else if (bio->bio_buf->b_flags & B_HASBOGUS) {
1100                         memcpy(bio->bio_buf->b_data, dmtc->data_buf,
1101                                bio->bio_buf->b_bcount);
1102                 }
1103 #endif
1104                 mpipe_free(&dmtc->priv->read_mpipe, dmtc->free_addr);
1105                 obio = pop_bio(bio);
1106                 biodone(obio);
1107         }
1108         return 0;
1109 }
1110 /* END OF STRATEGY READ SECTION */
1111
1112 /*
1113  * STRATEGY WRITE PATH PART 1/3
1114  */
1115
1116 static void
1117 dmtc_crypto_write_retry(void *arg1, void *arg2)
1118 {
1119         dm_target_crypt_config_t *priv = arg1;
1120         struct bio *bio = arg2;
1121
1122         KTR_LOG(dmcrypt_crypto_write_retry, bio->bio_buf);
1123
1124         dmtc_crypto_write_start(priv, bio);
1125 }
1126
1127 static void
1128 dmtc_crypto_write_start(dm_target_crypt_config_t *priv, struct bio *bio)
1129 {
1130         struct dmtc_helper *dmtc;
1131         struct cryptodesc *crd;
1132         struct cryptop *crp;
1133         struct cryptoini *cri;
1134         int i, bytes, sectors, sz;
1135         off_t isector;
1136         u_char *ptr, *space;
1137
1138         cri = &priv->crypto_session;
1139
1140         /*
1141          * Use b_bcount for consistency
1142          */
1143         bytes = bio->bio_buf->b_bcount;
1144
1145         isector = bio->bio_offset / DEV_BSIZE;  /* ivgen salt base? */
1146         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
1147         sz = sectors * (sizeof(*crp) + sizeof(*crd));
1148
1149         /*
1150          * For writes and reads with bogus page don't decrypt in place.
1151          */
1152         space = mpipe_alloc_callback(&priv->write_mpipe,
1153                                      dmtc_crypto_write_retry, priv, bio);
1154         if (space == NULL)
1155                 return;
1156
1157         dmtc = (struct dmtc_helper *)space;
1158         dmtc->free_addr = space;
1159         space += sizeof(struct dmtc_helper);
1160         memcpy(space + sz, bio->bio_buf->b_data, bytes);
1161
1162         bio->bio_caller_info2.ptr = dmtc;
1163         bio->bio_buf->b_error = 0;
1164
1165         dmtc->orig_buf = bio->bio_buf->b_data;
1166         dmtc->data_buf = space + sz;
1167         dmtc->priv = priv;
1168
1169         /*
1170          * Load crypto descriptors (crp/crd loop)
1171          */
1172         bzero(space, sz);
1173         ptr = space;
1174         bio->bio_caller_info3.value = sectors;
1175         cpu_sfence();
1176 #if 0
1177         kprintf("Write, bytes = %d (b_bcount), "
1178                 "sectors = %d (bio = %p, b_cmd = %d)\n",
1179                 bytes, sectors, bio, bio->bio_buf->b_cmd);
1180 #endif
1181         for (i = 0; i < sectors; i++) {
1182                 crp = (struct cryptop *)ptr;
1183                 ptr += sizeof(*crp);
1184                 crd = (struct cryptodesc *)ptr;
1185                 ptr += sizeof (*crd);
1186
1187                 crp->crp_buf = dmtc->data_buf + i * DEV_BSIZE;
1188
1189                 crp->crp_sid = priv->crypto_sid;
1190                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
1191
1192                 crp->crp_opaque = (void *)bio;
1193
1194                 crp->crp_callback = dmtc_crypto_cb_write_done;
1195                 crp->crp_desc = crd;
1196                 crp->crp_etype = 0;
1197                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
1198                                  CRYPTO_F_BATCH;
1199
1200                 crd->crd_alg = priv->crypto_alg;
1201 #if 0
1202                 crd->crd_key = (caddr_t)priv->crypto_key;
1203                 crd->crd_klen = priv->crypto_klen;
1204 #endif
1205
1206                 crd->crd_skip = 0;
1207                 crd->crd_len = DEV_BSIZE /* XXX */;
1208                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
1209                 crd->crd_next = NULL;
1210
1211                 crd->crd_flags |= CRD_F_ENCRYPT;
1212
1213                 /*
1214                  * Note: last argument is used to generate salt(?) and is
1215                  *       a 64 bit value, but the original code passed an
1216                  *       int.  Changing it now will break pre-existing
1217                  *       crypt volumes.
1218                  */
1219
1220                 KTR_LOG(dmcrypt_crypto_write_start, crp, bio->bio_buf,
1221                     i, sectors);
1222
1223                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
1224                                     isector + i, crp);
1225         }
1226 }
1227
1228 /*
1229  * STRATEGY WRITE PATH PART 2/3
1230  */
1231 static int
1232 dmtc_crypto_cb_write_done(struct cryptop *crp)
1233 {
1234         struct dmtc_helper *dmtc;
1235         dm_target_crypt_config_t *priv;
1236         struct bio *bio, *obio;
1237         int n;
1238
1239         if (crp->crp_etype == EAGAIN)
1240                 return crypto_dispatch(crp);
1241
1242         bio = (struct bio *)crp->crp_opaque;
1243         KKASSERT(bio != NULL);
1244
1245         /*
1246          * Cumulative error
1247          */
1248         if (crp->crp_etype != 0) {
1249                 kprintf("dm_target_crypt: dmtc_crypto_cb_write_done "
1250                         "crp_etype = %d\n",
1251                 crp->crp_etype);
1252                 bio->bio_buf->b_error = crp->crp_etype;
1253         }
1254
1255         /*
1256          * On the last chunk of the encryption we issue the write
1257          */
1258         n = atomic_fetchadd_int(&bio->bio_caller_info3.value, -1);
1259 #if 0
1260         kprintf("dmtc_crypto_cb_write_done %p, n = %d\n", bio, n);
1261 #endif
1262
1263         KTR_LOG(dmcrypt_crypto_cb_write_done, crp, bio->bio_buf, n);
1264
1265         if (n == 1) {
1266                 dmtc = bio->bio_caller_info2.ptr;
1267                 priv = (dm_target_crypt_config_t *)bio->bio_caller_info1.ptr;
1268
1269                 if (bio->bio_buf->b_error) {
1270                         bio->bio_buf->b_flags |= B_ERROR;
1271                         mpipe_free(&dmtc->priv->write_mpipe, dmtc->free_addr);
1272                         obio = pop_bio(bio);
1273                         biodone(obio);
1274                 } else {
1275                         dmtc->orig_buf = bio->bio_buf->b_data;
1276                         bio->bio_buf->b_data = dmtc->data_buf;
1277                         bio->bio_done = dmtc_bio_write_done;
1278                         vn_strategy(priv->pdev->pdev_vnode, bio);
1279                 }
1280         }
1281         return 0;
1282 }
1283
1284 /*
1285  * STRATEGY WRITE PATH PART 3/3
1286  */
1287 static void
1288 dmtc_bio_write_done(struct bio *bio)
1289 {
1290         struct dmtc_helper *dmtc;
1291         struct bio *obio;
1292
1293         dmtc = bio->bio_caller_info2.ptr;
1294         bio->bio_buf->b_data = dmtc->orig_buf;
1295         mpipe_free(&dmtc->priv->write_mpipe, dmtc->free_addr);
1296
1297         KTR_LOG(dmcrypt_bio_write_done, bio->bio_buf);
1298
1299         obio = pop_bio(bio);
1300         biodone(obio);
1301 }
1302 /* END OF STRATEGY WRITE SECTION */
1303
1304
1305
1306 /* DUMPING MAGIC */
1307
1308 extern int tsleep_crypto_dump;
1309
1310 static int
1311 dm_target_crypt_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
1312 {
1313         static struct dmtc_dump_helper dump_helper;
1314         dm_target_crypt_config_t *priv;
1315         int id;
1316         static int first_call = 1;
1317
1318         priv = table_en->target_config;
1319
1320         if (first_call) {
1321                 first_call = 0;
1322                 dump_reactivate_cpus();
1323         }
1324
1325         /* Magically enable tsleep */
1326         tsleep_crypto_dump = 1;
1327         id = 0;
1328
1329         /*
1330          * 0 length means flush buffers and return
1331          */
1332         if (length == 0) {
1333                 if (priv->pdev->pdev_vnode->v_rdev == NULL) {
1334                         tsleep_crypto_dump = 0;
1335                         return ENXIO;
1336                 }
1337                 dev_ddump(priv->pdev->pdev_vnode->v_rdev,
1338                     data, 0, offset, 0);
1339                 tsleep_crypto_dump = 0;
1340                 return 0;
1341         }
1342
1343         bzero(&dump_helper, sizeof(dump_helper));
1344         dump_helper.priv = priv;
1345         dump_helper.data = data;
1346         dump_helper.length = length;
1347         dump_helper.offset = offset +
1348             priv->block_offset * DEV_BSIZE;
1349         dump_helper.ident = &id;
1350         dmtc_crypto_dump_start(priv, &dump_helper);
1351
1352         /*
1353          * Hackery to make stuff appear synchronous. The crypto callback will
1354          * set id to 1 and call wakeup on it. If the request completed
1355          * synchronously, id will be 1 and we won't bother to sleep. If not,
1356          * the crypto request will complete asynchronously and we sleep until
1357          * it's done.
1358          */
1359         if (id == 0)
1360                 tsleep(&dump_helper, 0, "cryptdump", 0);
1361
1362         dump_helper.offset = dm_pdev_correct_dump_offset(priv->pdev,
1363             dump_helper.offset);
1364
1365         dev_ddump(priv->pdev->pdev_vnode->v_rdev,
1366             dump_helper.space, 0, dump_helper.offset,
1367             dump_helper.length);
1368
1369         tsleep_crypto_dump = 0;
1370         return 0;
1371 }
1372
1373 static void
1374 dmtc_crypto_dump_start(dm_target_crypt_config_t *priv, struct dmtc_dump_helper *dump_helper)
1375 {
1376         struct cryptodesc *crd;
1377         struct cryptop *crp;
1378         struct cryptoini *cri;
1379         int i, bytes, sectors;
1380         off_t isector;
1381
1382         cri = &priv->crypto_session;
1383
1384         bytes = dump_helper->length;
1385
1386         isector = dump_helper->offset / DEV_BSIZE;      /* ivgen salt base? */
1387         sectors = bytes / DEV_BSIZE;            /* Number of sectors */
1388         dump_helper->sectors = sectors;
1389 #if 0
1390         kprintf("Dump, bytes = %d, "
1391                 "sectors = %d, LENGTH=%zu\n", bytes, sectors, dump_helper->length);
1392 #endif
1393         KKASSERT(dump_helper->length <= 65536);
1394
1395         memcpy(dump_helper->space, dump_helper->data, bytes);
1396
1397         cpu_sfence();
1398
1399         for (i = 0; i < sectors; i++) {
1400                 crp = &dump_helper->crp[i];
1401                 crd = &dump_helper->crd[i];
1402
1403                 crp->crp_buf = dump_helper->space + i * DEV_BSIZE;
1404
1405                 crp->crp_sid = priv->crypto_sid;
1406                 crp->crp_ilen = crp->crp_olen = DEV_BSIZE;
1407
1408                 crp->crp_opaque = (void *)dump_helper;
1409
1410                 crp->crp_callback = dmtc_crypto_cb_dump_done;
1411                 crp->crp_desc = crd;
1412                 crp->crp_etype = 0;
1413                 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL |
1414                                  CRYPTO_F_BATCH;
1415
1416                 crd->crd_alg = priv->crypto_alg;
1417
1418                 crd->crd_skip = 0;
1419                 crd->crd_len = DEV_BSIZE /* XXX */;
1420                 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
1421                 crd->crd_next = NULL;
1422
1423                 crd->crd_flags |= CRD_F_ENCRYPT;
1424
1425                 /*
1426                  * Note: last argument is used to generate salt(?) and is
1427                  *       a 64 bit value, but the original code passed an
1428                  *       int.  Changing it now will break pre-existing
1429                  *       crypt volumes.
1430                  */
1431                 priv->ivgen->gen_iv(priv, crd->crd_iv, sizeof(crd->crd_iv),
1432                                     isector + i, crp);
1433         }
1434 }
1435
1436 static int
1437 dmtc_crypto_cb_dump_done(struct cryptop *crp)
1438 {
1439         struct dmtc_dump_helper *dump_helper;
1440         dm_target_crypt_config_t *priv;
1441         int n;
1442
1443         if (crp->crp_etype == EAGAIN)
1444                 return crypto_dispatch(crp);
1445
1446         dump_helper = (struct dmtc_dump_helper *)crp->crp_opaque;
1447         KKASSERT(dump_helper != NULL);
1448
1449         if (crp->crp_etype != 0) {
1450                 kprintf("dm_target_crypt: dmtc_crypto_cb_dump_done "
1451                         "crp_etype = %d\n",
1452                 crp->crp_etype);
1453                 return crp->crp_etype;
1454         }
1455
1456         /*
1457          * On the last chunk of the encryption we return control
1458          */
1459         n = atomic_fetchadd_int(&dump_helper->sectors, -1);
1460
1461         if (n == 1) {
1462                 priv = dump_helper->priv;
1463                 atomic_add_int(dump_helper->ident, 1);
1464                 wakeup(dump_helper);
1465         }
1466
1467         return 0;
1468 }
1469
1470 static int
1471 dmtc_mod_handler(module_t mod, int type, void *unused)
1472 {
1473         dm_target_t *dmt = NULL;
1474         int err = 0;
1475
1476         switch (type) {
1477         case MOD_LOAD:
1478                 if ((dmt = dm_target_lookup("crypt")) != NULL) {
1479                         dm_target_unbusy(dmt);
1480                         return EEXIST;
1481                 }
1482                 dmt = dm_target_alloc("crypt");
1483                 dmt->version[0] = 1;
1484                 dmt->version[1] = 6;
1485                 dmt->version[2] = 0;
1486                 strlcpy(dmt->name, "crypt", DM_MAX_TYPE_NAME);
1487                 dmt->init = &dm_target_crypt_init;
1488                 dmt->status = &dm_target_crypt_status;
1489                 dmt->strategy = &dm_target_crypt_strategy;
1490                 dmt->deps = &dm_target_crypt_deps;
1491                 dmt->destroy = &dm_target_crypt_destroy;
1492                 dmt->upcall = &dm_target_crypt_upcall;
1493                 dmt->dump = &dm_target_crypt_dump;
1494
1495                 err = dm_target_insert(dmt);
1496                 if (!err)
1497                         kprintf("dm_target_crypt: Successfully initialized\n");
1498                 break;
1499
1500         case MOD_UNLOAD:
1501                 err = dm_target_rem("crypt");
1502                 if (err == 0) {
1503                         kprintf("dm_target_crypt: unloaded\n");
1504                 }
1505                 break;
1506
1507         default:
1508                 break;
1509         }
1510
1511         return err;
1512 }
1513
1514 DM_TARGET_MODULE(dm_target_crypt, dmtc_mod_handler);