sys/geom/eli/g_eli.c

   1 /*-
   2  * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kernel.h>
  33 #include <sys/linker.h>
  34 #include <sys/module.h>
  35 #include <sys/lock.h>
  36 #include <sys/mutex.h>
  37 #include <sys/bio.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/malloc.h>
  40 #include <sys/eventhandler.h>
  41 #include <sys/kthread.h>
  42 #include <sys/proc.h>
  43 #include <sys/sched.h>
  44 #include <sys/smp.h>
  45 #include <sys/uio.h>
  46 #include <sys/vnode.h>
  47
  48 #include <vm/uma.h>
  49
  50 #include <geom/geom.h>
  51 #include <geom/eli/g_eli.h>
  52 #include <geom/eli/pkcs5v2.h>
  53
  54
  55 MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data");
  56
  57 SYSCTL_DECL(_kern_geom);
  58 SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff");
  59 int g_eli_debug = 0;
  60 TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug);
  61 SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0,
  62     "Debug level");
  63 static u_int g_eli_tries = 3;
  64 TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries);
  65 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0,
  66     "Number of tries for entering the passphrase");
  67 static u_int g_eli_visible_passphrase = 0;
  68 TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase);
  69 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW,
  70     &g_eli_visible_passphrase, 0,
  71     "Turn on echo when entering the passphrase (for debug purposes only!!)");
  72 u_int g_eli_overwrites = G_ELI_OVERWRITES;
  73 TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites);
  74 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites,
  75     0, "Number of times on-disk keys should be overwritten when destroying them");
  76 static u_int g_eli_threads = 0;
  77 TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads);
  78 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0,
  79     "Number of threads doing crypto work");
  80 u_int g_eli_batch = 0;
  81 TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch);
  82 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0,
  83     "Use crypto operations batching");
  84
  85 static eventhandler_tag g_eli_pre_sync = NULL;
  86
  87 static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp,
  88     struct g_geom *gp);
  89 static void g_eli_init(struct g_class *mp);
  90 static void g_eli_fini(struct g_class *mp);
  91
  92 static g_taste_t g_eli_taste;
  93 static g_dumpconf_t g_eli_dumpconf;
  94
  95 struct g_class g_eli_class = {
  96         .name = G_ELI_CLASS_NAME,
  97         .version = G_VERSION,
  98         .ctlreq = g_eli_config,
  99         .taste = g_eli_taste,
 100         .destroy_geom = g_eli_destroy_geom,
 101         .init = g_eli_init,
 102         .fini = g_eli_fini
 103 };
 104
 105
 106 /*
 107  * Code paths:
 108  * BIO_READ:
 109  *      g_eli_start -> g_eli_crypto_read -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
 110  * BIO_WRITE:
 111  *      g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
 112  */
 113
 114
 115 /*
 116  * EAGAIN from crypto(9) means, that we were probably balanced to another crypto
 117  * accelerator or something like this.
 118  * The function updates the SID and rerun the operation.
 119  */
 120 int
 121 g_eli_crypto_rerun(struct cryptop *crp)
 122 {
 123         struct g_eli_softc *sc;
 124         struct g_eli_worker *wr;
 125         struct bio *bp;
 126         int error;
 127
 128         bp = (struct bio *)crp->crp_opaque;
 129         sc = bp->bio_to->geom->softc;
 130         LIST_FOREACH(wr, &sc->sc_workers, w_next) {
 131                 if (wr->w_number == bp->bio_pflags)
 132                         break;
 133         }
 134         KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags));
 135         G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).",
 136             bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid,
 137             (uintmax_t)crp->crp_sid);
 138         wr->w_sid = crp->crp_sid;
 139         crp->crp_etype = 0;
 140         error = crypto_dispatch(crp);
 141         if (error == 0)
 142                 return (0);
 143         G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error);
 144         crp->crp_etype = error;
 145         return (error);
 146 }
 147
 148 /*
 149  * The function is called afer reading encrypted data from the provider.
 150  *
 151  * g_eli_start -> g_eli_crypto_read -> g_io_request -> G_ELI_READ_DONE -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
 152  */
 153 void
 154 g_eli_read_done(struct bio *bp)
 155 {
 156         struct g_eli_softc *sc;
 157         struct bio *pbp;
 158
 159         G_ELI_LOGREQ(2, bp, "Request done.");
 160         pbp = bp->bio_parent;
 161         if (pbp->bio_error == 0)
 162                 pbp->bio_error = bp->bio_error;
 163         /*
 164          * Do we have all sectors already?
 165          */
 166         pbp->bio_inbed++;
 167         if (pbp->bio_inbed < pbp->bio_children)
 168                 return;
 169         g_destroy_bio(bp);
 170         sc = pbp->bio_to->geom->softc;
 171         if (pbp->bio_error != 0) {
 172                 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__);
 173                 pbp->bio_completed = 0;
 174                 if (pbp->bio_driver2 != NULL) {
 175                         free(pbp->bio_driver2, M_ELI);
 176                         pbp->bio_driver2 = NULL;
 177                 }
 178                 g_io_deliver(pbp, pbp->bio_error);
 179                 atomic_subtract_int(&sc->sc_inflight, 1);
 180                 return;
 181         }
 182         mtx_lock(&sc->sc_queue_mtx);
 183         bioq_insert_tail(&sc->sc_queue, pbp);
 184         mtx_unlock(&sc->sc_queue_mtx);
 185         wakeup(sc);
 186 }
 187
 188 /*
 189  * The function is called after we encrypt and write data.
 190  *
 191  * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver
 192  */
 193 void
 194 g_eli_write_done(struct bio *bp)
 195 {
 196         struct g_eli_softc *sc;
 197         struct bio *pbp;
 198
 199         G_ELI_LOGREQ(2, bp, "Request done.");
 200         pbp = bp->bio_parent;
 201         if (pbp->bio_error == 0) {
 202                 if (bp->bio_error != 0)
 203                         pbp->bio_error = bp->bio_error;
 204         }
 205         /*
 206          * Do we have all sectors already?
 207          */
 208         pbp->bio_inbed++;
 209         if (pbp->bio_inbed < pbp->bio_children)
 210                 return;
 211         free(pbp->bio_driver2, M_ELI);
 212         pbp->bio_driver2 = NULL;
 213         if (pbp->bio_error != 0) {
 214                 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).",
 215                     pbp->bio_error);
 216                 pbp->bio_completed = 0;
 217         }
 218         g_destroy_bio(bp);
 219         /*
 220          * Write is finished, send it up.
 221          */
 222         pbp->bio_completed = pbp->bio_length;
 223         sc = pbp->bio_to->geom->softc;
 224         g_io_deliver(pbp, pbp->bio_error);
 225         atomic_subtract_int(&sc->sc_inflight, 1);
 226 }
 227
 228 /*
 229  * This function should never be called, but GEOM made as it set ->orphan()
 230  * method for every geom.
 231  */
 232 static void
 233 g_eli_orphan_spoil_assert(struct g_consumer *cp)
 234 {
 235
 236         panic("Function %s() called for %s.", __func__, cp->geom->name);
 237 }
 238
 239 static void
 240 g_eli_orphan(struct g_consumer *cp)
 241 {
 242         struct g_eli_softc *sc;
 243
 244         g_topology_assert();
 245         sc = cp->geom->softc;
 246         if (sc == NULL)
 247                 return;
 248         g_eli_destroy(sc, TRUE);
 249 }
 250
 251 /*
 252  * BIO_READ:
 253  *      G_ELI_START -> g_eli_crypto_read -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
 254  * BIO_WRITE:
 255  *      G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
 256  */
 257 static void
 258 g_eli_start(struct bio *bp)
 259 {
 260         struct g_eli_softc *sc;
 261         struct g_consumer *cp;
 262         struct bio *cbp;
 263
 264         sc = bp->bio_to->geom->softc;
 265         KASSERT(sc != NULL,
 266             ("Provider's error should be set (error=%d)(device=%s).",
 267             bp->bio_to->error, bp->bio_to->name));
 268         G_ELI_LOGREQ(2, bp, "Request received.");
 269
 270         switch (bp->bio_cmd) {
 271         case BIO_READ:
 272         case BIO_WRITE:
 273         case BIO_GETATTR:
 274         case BIO_FLUSH:
 275                 break;
 276         case BIO_DELETE:
 277                 /*
 278                  * We could eventually support BIO_DELETE request.
 279                  * It could be done by overwritting requested sector with
 280                  * random data g_eli_overwrites number of times.
 281                  */
 282         default:
 283                 g_io_deliver(bp, EOPNOTSUPP);
 284                 return;
 285         }
 286         cbp = g_clone_bio(bp);
 287         if (cbp == NULL) {
 288                 g_io_deliver(bp, ENOMEM);
 289                 return;
 290         }
 291         bp->bio_driver1 = cbp;
 292         bp->bio_pflags = G_ELI_NEW_BIO;
 293         switch (bp->bio_cmd) {
 294         case BIO_READ:
 295                 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) {
 296                         g_eli_crypto_read(sc, bp, 0);
 297                         break;
 298                 }
 299                 /* FALLTHROUGH */
 300         case BIO_WRITE:
 301                 mtx_lock(&sc->sc_queue_mtx);
 302                 bioq_insert_tail(&sc->sc_queue, bp);
 303                 mtx_unlock(&sc->sc_queue_mtx);
 304                 wakeup(sc);
 305                 break;
 306         case BIO_GETATTR:
 307         case BIO_FLUSH:
 308                 cbp->bio_done = g_std_done;
 309                 cp = LIST_FIRST(&sc->sc_geom->consumer);
 310                 cbp->bio_to = cp->provider;
 311                 G_ELI_LOGREQ(2, cbp, "Sending request.");
 312                 g_io_request(cbp, cp);
 313                 break;
 314         }
 315 }
 316
 317 static int
 318 g_eli_newsession(struct g_eli_worker *wr)
 319 {
 320         struct g_eli_softc *sc;
 321         struct cryptoini crie, cria;
 322         int error;
 323
 324         sc = wr->w_softc;
 325
 326         bzero(&crie, sizeof(crie));
 327         crie.cri_alg = sc->sc_ealgo;
 328         crie.cri_klen = sc->sc_ekeylen;
 329         if (sc->sc_ealgo == CRYPTO_AES_XTS)
 330                 crie.cri_klen <<= 1;
 331         crie.cri_key = sc->sc_ekeys[0];
 332         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
 333                 bzero(&cria, sizeof(cria));
 334                 cria.cri_alg = sc->sc_aalgo;
 335                 cria.cri_klen = sc->sc_akeylen;
 336                 cria.cri_key = sc->sc_akey;
 337                 crie.cri_next = &cria;
 338         }
 339
 340         switch (sc->sc_crypto) {
 341         case G_ELI_CRYPTO_SW:
 342                 error = crypto_newsession(&wr->w_sid, &crie,
 343                     CRYPTOCAP_F_SOFTWARE);
 344                 break;
 345         case G_ELI_CRYPTO_HW:
 346                 error = crypto_newsession(&wr->w_sid, &crie,
 347                     CRYPTOCAP_F_HARDWARE);
 348                 break;
 349         case G_ELI_CRYPTO_UNKNOWN:
 350                 error = crypto_newsession(&wr->w_sid, &crie,
 351                     CRYPTOCAP_F_HARDWARE);
 352                 if (error == 0) {
 353                         mtx_lock(&sc->sc_queue_mtx);
 354                         if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN)
 355                                 sc->sc_crypto = G_ELI_CRYPTO_HW;
 356                         mtx_unlock(&sc->sc_queue_mtx);
 357                 } else {
 358                         error = crypto_newsession(&wr->w_sid, &crie,
 359                             CRYPTOCAP_F_SOFTWARE);
 360                         mtx_lock(&sc->sc_queue_mtx);
 361                         if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN)
 362                                 sc->sc_crypto = G_ELI_CRYPTO_SW;
 363                         mtx_unlock(&sc->sc_queue_mtx);
 364                 }
 365                 break;
 366         default:
 367                 panic("%s: invalid condition", __func__);
 368         }
 369
 370         return (error);
 371 }
 372
 373 static void
 374 g_eli_freesession(struct g_eli_worker *wr)
 375 {
 376
 377         crypto_freesession(wr->w_sid);
 378 }
 379
 380 static void
 381 g_eli_cancel(struct g_eli_softc *sc)
 382 {
 383         struct bio *bp;
 384
 385         mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
 386
 387         while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) {
 388                 KASSERT(bp->bio_pflags == G_ELI_NEW_BIO,
 389                     ("Not new bio when canceling (bp=%p).", bp));
 390                 g_io_deliver(bp, ENXIO);
 391         }
 392 }
 393
 394 static struct bio *
 395 g_eli_takefirst(struct g_eli_softc *sc)
 396 {
 397         struct bio *bp;
 398
 399         mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
 400
 401         if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND))
 402                 return (bioq_takefirst(&sc->sc_queue));
 403         /*
 404          * Device suspended, so we skip new I/O requests.
 405          */
 406         TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
 407                 if (bp->bio_pflags != G_ELI_NEW_BIO)
 408                         break;
 409         }
 410         if (bp != NULL)
 411                 bioq_remove(&sc->sc_queue, bp);
 412         return (bp);
 413 }
 414
 415 /*
 416  * This is the main function for kernel worker thread when we don't have
 417  * hardware acceleration and we have to do cryptography in software.
 418  * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM
 419  * threads with crypto work.
 420  */
 421 static void
 422 g_eli_worker(void *arg)
 423 {
 424         struct g_eli_softc *sc;
 425         struct g_eli_worker *wr;
 426         struct bio *bp;
 427         int error;
 428
 429         wr = arg;
 430         sc = wr->w_softc;
 431 #ifdef SMP
 432         /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */
 433         if (mp_ncpus > 1 && sc->sc_crypto == G_ELI_CRYPTO_SW &&
 434             g_eli_threads == 0) {
 435                 while (!smp_started)
 436                         tsleep(wr, 0, "geli:smp", hz / 4);
 437         }
 438 #endif
 439         thread_lock(curthread);
 440         sched_prio(curthread, PUSER);
 441         if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0)
 442                 sched_bind(curthread, wr->w_number);
 443         thread_unlock(curthread);
 444
 445         G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
 446
 447         for (;;) {
 448                 mtx_lock(&sc->sc_queue_mtx);
 449 again:
 450                 bp = g_eli_takefirst(sc);
 451                 if (bp == NULL) {
 452                         if (sc->sc_flags & G_ELI_FLAG_DESTROY) {
 453                                 g_eli_cancel(sc);
 454                                 LIST_REMOVE(wr, w_next);
 455                                 g_eli_freesession(wr);
 456                                 free(wr, M_ELI);
 457                                 G_ELI_DEBUG(1, "Thread %s exiting.",
 458                                     curthread->td_proc->p_comm);
 459                                 wakeup(&sc->sc_workers);
 460                                 mtx_unlock(&sc->sc_queue_mtx);
 461                                 kproc_exit(0);
 462                         }
 463                         while (sc->sc_flags & G_ELI_FLAG_SUSPEND) {
 464                                 if (sc->sc_inflight > 0) {
 465                                         G_ELI_DEBUG(0, "inflight=%d", sc->sc_inflight);
 466                                         /*
 467                                          * We still have inflight BIOs, so
 468                                          * sleep and retry.
 469                                          */
 470                                         msleep(sc, &sc->sc_queue_mtx, PRIBIO,
 471                                             "geli:inf", hz / 5);
 472                                         goto again;
 473                                 }
 474                                 /*
 475                                  * Suspend requested, mark the worker as
 476                                  * suspended and go to sleep.
 477                                  */
 478                                 if (wr->w_active) {
 479                                         g_eli_freesession(wr);
 480                                         wr->w_active = FALSE;
 481                                 }
 482                                 wakeup(&sc->sc_workers);
 483                                 msleep(sc, &sc->sc_queue_mtx, PRIBIO,
 484                                     "geli:suspend", 0);
 485                                 if (!wr->w_active &&
 486                                     !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) {
 487                                         error = g_eli_newsession(wr);
 488                                         KASSERT(error == 0,
 489                                             ("g_eli_newsession() failed on resume (error=%d)",
 490                                             error));
 491                                         wr->w_active = TRUE;
 492                                 }
 493                                 goto again;
 494                         }
 495                         msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0);
 496                         continue;
 497                 }
 498                 if (bp->bio_pflags == G_ELI_NEW_BIO)
 499                         atomic_add_int(&sc->sc_inflight, 1);
 500                 mtx_unlock(&sc->sc_queue_mtx);
 501                 if (bp->bio_pflags == G_ELI_NEW_BIO) {
 502                         bp->bio_pflags = 0;
 503                         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
 504                                 if (bp->bio_cmd == BIO_READ)
 505                                         g_eli_auth_read(sc, bp);
 506                                 else
 507                                         g_eli_auth_run(wr, bp);
 508                         } else {
 509                                 if (bp->bio_cmd == BIO_READ)
 510                                         g_eli_crypto_read(sc, bp, 1);
 511                                 else
 512                                         g_eli_crypto_run(wr, bp);
 513                         }
 514                 } else {
 515                         if (sc->sc_flags & G_ELI_FLAG_AUTH)
 516                                 g_eli_auth_run(wr, bp);
 517                         else
 518                                 g_eli_crypto_run(wr, bp);
 519                 }
 520         }
 521 }
 522
 523 /*
 524  * Select encryption key. If G_ELI_FLAG_SINGLE_KEY is present we only have one
 525  * key available for all the data. If the flag is not present select the key
 526  * based on data offset.
 527  */
 528 uint8_t *
 529 g_eli_crypto_key(struct g_eli_softc *sc, off_t offset, size_t blocksize)
 530 {
 531         u_int nkey;
 532
 533         if (sc->sc_nekeys == 1)
 534                 return (sc->sc_ekeys[0]);
 535
 536         KASSERT(sc->sc_nekeys > 1, ("%s: sc_nekeys=%u", __func__,
 537             sc->sc_nekeys));
 538         KASSERT((sc->sc_flags & G_ELI_FLAG_SINGLE_KEY) == 0,
 539             ("%s: SINGLE_KEY flag set, but sc_nekeys=%u", __func__,
 540             sc->sc_nekeys));
 541
 542         /* We switch key every 2^G_ELI_KEY_SHIFT blocks. */
 543         nkey = (offset >> G_ELI_KEY_SHIFT) / blocksize;
 544
 545         KASSERT(nkey < sc->sc_nekeys, ("%s: nkey=%u >= sc_nekeys=%u", __func__,
 546             nkey, sc->sc_nekeys));
 547
 548         return (sc->sc_ekeys[nkey]);
 549 }
 550
 551 /*
 552  * Here we generate IV. It is unique for every sector.
 553  */
 554 void
 555 g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
 556     size_t size)
 557 {
 558         uint8_t off[8];
 559
 560         if ((sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER) != 0)
 561                 bcopy(&offset, off, sizeof(off));
 562         else
 563                 le64enc(off, (uint64_t)offset);
 564
 565         switch (sc->sc_ealgo) {
 566         case CRYPTO_AES_XTS:
 567                 bcopy(off, iv, sizeof(off));
 568                 bzero(iv + sizeof(off), size - sizeof(off));
 569                 break;
 570         default:
 571             {
 572                 u_char hash[SHA256_DIGEST_LENGTH];
 573                 SHA256_CTX ctx;
 574
 575                 /* Copy precalculated SHA256 context for IV-Key. */
 576                 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx));
 577                 SHA256_Update(&ctx, off, sizeof(off));
 578                 SHA256_Final(hash, &ctx);
 579                 bcopy(hash, iv, MIN(sizeof(hash), size));
 580                 break;
 581             }
 582         }
 583 }
 584
 585 int
 586 g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
 587     struct g_eli_metadata *md)
 588 {
 589         struct g_geom *gp;
 590         struct g_consumer *cp;
 591         u_char *buf = NULL;
 592         int error;
 593
 594         g_topology_assert();
 595
 596         gp = g_new_geomf(mp, "eli:taste");
 597         gp->start = g_eli_start;
 598         gp->access = g_std_access;
 599         /*
 600          * g_eli_read_metadata() is always called from the event thread.
 601          * Our geom is created and destroyed in the same event, so there
 602          * could be no orphan nor spoil event in the meantime.
 603          */
 604         gp->orphan = g_eli_orphan_spoil_assert;
 605         gp->spoiled = g_eli_orphan_spoil_assert;
 606         cp = g_new_consumer(gp);
 607         error = g_attach(cp, pp);
 608         if (error != 0)
 609                 goto end;
 610         error = g_access(cp, 1, 0, 0);
 611         if (error != 0)
 612                 goto end;
 613         g_topology_unlock();
 614         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
 615             &error);
 616         g_topology_lock();
 617         if (buf == NULL)
 618                 goto end;
 619         eli_metadata_decode(buf, md);
 620 end:
 621         if (buf != NULL)
 622                 g_free(buf);
 623         if (cp->provider != NULL) {
 624                 if (cp->acr == 1)
 625                         g_access(cp, -1, 0, 0);
 626                 g_detach(cp);
 627         }
 628         g_destroy_consumer(cp);
 629         g_destroy_geom(gp);
 630         return (error);
 631 }
 632
 633 /*
 634  * The function is called when we had last close on provider and user requested
 635  * to close it when this situation occur.
 636  */
 637 static void
 638 g_eli_last_close(struct g_eli_softc *sc)
 639 {
 640         struct g_geom *gp;
 641         struct g_provider *pp;
 642         char ppname[64];
 643         int error;
 644
 645         g_topology_assert();
 646         gp = sc->sc_geom;
 647         pp = LIST_FIRST(&gp->provider);
 648         strlcpy(ppname, pp->name, sizeof(ppname));
 649         error = g_eli_destroy(sc, TRUE);
 650         KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).",
 651             ppname, error));
 652         G_ELI_DEBUG(0, "Detached %s on last close.", ppname);
 653 }
 654
 655 int
 656 g_eli_access(struct g_provider *pp, int dr, int dw, int de)
 657 {
 658         struct g_eli_softc *sc;
 659         struct g_geom *gp;
 660
 661         gp = pp->geom;
 662         sc = gp->softc;
 663
 664         if (dw > 0) {
 665                 if (sc->sc_flags & G_ELI_FLAG_RO) {
 666                         /* Deny write attempts. */
 667                         return (EROFS);
 668                 }
 669                 /* Someone is opening us for write, we need to remember that. */
 670                 sc->sc_flags |= G_ELI_FLAG_WOPEN;
 671                 return (0);
 672         }
 673         /* Is this the last close? */
 674         if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0)
 675                 return (0);
 676
 677         /*
 678          * Automatically detach on last close if requested.
 679          */
 680         if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) ||
 681             (sc->sc_flags & G_ELI_FLAG_WOPEN)) {
 682                 g_eli_last_close(sc);
 683         }
 684         return (0);
 685 }
 686
 687 static int
 688 g_eli_cpu_is_disabled(int cpu)
 689 {
 690 #ifdef SMP
 691         return ((hlt_cpus_mask & (1 << cpu)) != 0);
 692 #else
 693         return (0);
 694 #endif
 695 }
 696
 697 struct g_geom *
 698 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp,
 699     const struct g_eli_metadata *md, const u_char *mkey, int nkey)
 700 {
 701         struct g_eli_softc *sc;
 702         struct g_eli_worker *wr;
 703         struct g_geom *gp;
 704         struct g_provider *pp;
 705         struct g_consumer *cp;
 706         u_int i, threads;
 707         int error;
 708
 709         G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX);
 710
 711         gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX);
 712         gp->softc = NULL;       /* for a moment */
 713
 714         sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO);
 715         gp->start = g_eli_start;
 716         /*
 717          * Spoiling cannot happen actually, because we keep provider open for
 718          * writing all the time or provider is read-only.
 719          */
 720         gp->spoiled = g_eli_orphan_spoil_assert;
 721         gp->orphan = g_eli_orphan;
 722         gp->dumpconf = g_eli_dumpconf;
 723         /*
 724          * If detach-on-last-close feature is not enabled and we don't operate
 725          * on read-only provider, we can simply use g_std_access().
 726          */
 727         if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO))
 728                 gp->access = g_eli_access;
 729         else
 730                 gp->access = g_std_access;
 731
 732         sc->sc_inflight = 0;
 733         sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN;
 734         sc->sc_flags = md->md_flags;
 735         /* Backward compatibility. */
 736         if (md->md_version < 4)
 737                 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER;
 738         if (md->md_version < 5)
 739                 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY;
 740         sc->sc_ealgo = md->md_ealgo;
 741         sc->sc_nkey = nkey;
 742
 743         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
 744                 sc->sc_akeylen = sizeof(sc->sc_akey) * 8;
 745                 sc->sc_aalgo = md->md_aalgo;
 746                 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo);
 747
 748                 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen;
 749                 /*
 750                  * Some hash functions (like SHA1 and RIPEMD160) generates hash
 751                  * which length is not multiple of 128 bits, but we want data
 752                  * length to be multiple of 128, so we can encrypt without
 753                  * padding. The line below rounds down data length to multiple
 754                  * of 128 bits.
 755                  */
 756                 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16;
 757
 758                 sc->sc_bytes_per_sector =
 759                     (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1;
 760                 sc->sc_bytes_per_sector *= bpp->sectorsize;
 761         }
 762
 763         gp->softc = sc;
 764         sc->sc_geom = gp;
 765
 766         bioq_init(&sc->sc_queue);
 767         mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF);
 768
 769         pp = NULL;
 770         cp = g_new_consumer(gp);
 771         error = g_attach(cp, bpp);
 772         if (error != 0) {
 773                 if (req != NULL) {
 774                         gctl_error(req, "Cannot attach to %s (error=%d).",
 775                             bpp->name, error);
 776                 } else {
 777                         G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).",
 778                             bpp->name, error);
 779                 }
 780                 goto failed;
 781         }
 782         /*
 783          * Keep provider open all the time, so we can run critical tasks,
 784          * like Master Keys deletion, without wondering if we can open
 785          * provider or not.
 786          * We don't open provider for writing only when user requested read-only
 787          * access.
 788          */
 789         if (sc->sc_flags & G_ELI_FLAG_RO)
 790                 error = g_access(cp, 1, 0, 1);
 791         else
 792                 error = g_access(cp, 1, 1, 1);
 793         if (error != 0) {
 794                 if (req != NULL) {
 795                         gctl_error(req, "Cannot access %s (error=%d).",
 796                             bpp->name, error);
 797                 } else {
 798                         G_ELI_DEBUG(1, "Cannot access %s (error=%d).",
 799                             bpp->name, error);
 800                 }
 801                 goto failed;
 802         }
 803
 804         sc->sc_sectorsize = md->md_sectorsize;
 805         sc->sc_mediasize = bpp->mediasize;
 806         if (!(sc->sc_flags & G_ELI_FLAG_ONETIME))
 807                 sc->sc_mediasize -= bpp->sectorsize;
 808         if (!(sc->sc_flags & G_ELI_FLAG_AUTH))
 809                 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize);
 810         else {
 811                 sc->sc_mediasize /= sc->sc_bytes_per_sector;
 812                 sc->sc_mediasize *= sc->sc_sectorsize;
 813         }
 814
 815         /*
 816          * Remember the keys in our softc structure.
 817          */
 818         g_eli_mkey_propagate(sc, mkey);
 819         sc->sc_ekeylen = md->md_keylen;
 820
 821         LIST_INIT(&sc->sc_workers);
 822
 823         threads = g_eli_threads;
 824         if (threads == 0)
 825                 threads = mp_ncpus;
 826         else if (threads > mp_ncpus) {
 827                 /* There is really no need for too many worker threads. */
 828                 threads = mp_ncpus;
 829                 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads);
 830         }
 831         for (i = 0; i < threads; i++) {
 832                 if (g_eli_cpu_is_disabled(i)) {
 833                         G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.",
 834                             bpp->name, i);
 835                         continue;
 836                 }
 837                 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);
 838                 wr->w_softc = sc;
 839                 wr->w_number = i;
 840                 wr->w_active = TRUE;
 841
 842                 error = g_eli_newsession(wr);
 843                 if (error != 0) {
 844                         free(wr, M_ELI);
 845                         if (req != NULL) {
 846                                 gctl_error(req, "Cannot set up crypto session "
 847                                     "for %s (error=%d).", bpp->name, error);
 848                         } else {
 849                                 G_ELI_DEBUG(1, "Cannot set up crypto session "
 850                                     "for %s (error=%d).", bpp->name, error);
 851                         }
 852                         goto failed;
 853                 }
 854
 855                 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0,
 856                     "g_eli[%u] %s", i, bpp->name);
 857                 if (error != 0) {
 858                         g_eli_freesession(wr);
 859                         free(wr, M_ELI);
 860                         if (req != NULL) {
 861                                 gctl_error(req, "Cannot create kernel thread "
 862                                     "for %s (error=%d).", bpp->name, error);
 863                         } else {
 864                                 G_ELI_DEBUG(1, "Cannot create kernel thread "
 865                                     "for %s (error=%d).", bpp->name, error);
 866                         }
 867                         goto failed;
 868                 }
 869                 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next);
 870                 /* If we have hardware support, one thread is enough. */
 871                 if (sc->sc_crypto == G_ELI_CRYPTO_HW)
 872                         break;
 873         }
 874
 875         /*
 876          * Create decrypted provider.
 877          */
 878         pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX);
 879         pp->mediasize = sc->sc_mediasize;
 880         pp->sectorsize = sc->sc_sectorsize;
 881
 882         g_error_provider(pp, 0);
 883
 884         G_ELI_DEBUG(0, "Device %s created.", pp->name);
 885         G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo),
 886             sc->sc_ekeylen);
 887         if (sc->sc_flags & G_ELI_FLAG_AUTH)
 888                 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo));
 889         G_ELI_DEBUG(0, "    Crypto: %s",
 890             sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware");
 891         return (gp);
 892 failed:
 893         mtx_lock(&sc->sc_queue_mtx);
 894         sc->sc_flags |= G_ELI_FLAG_DESTROY;
 895         wakeup(sc);
 896         /*
 897          * Wait for kernel threads self destruction.
 898          */
 899         while (!LIST_EMPTY(&sc->sc_workers)) {
 900                 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
 901                     "geli:destroy", 0);
 902         }
 903         mtx_destroy(&sc->sc_queue_mtx);
 904         if (cp->provider != NULL) {
 905                 if (cp->acr == 1)
 906                         g_access(cp, -1, -1, -1);
 907                 g_detach(cp);
 908         }
 909         g_destroy_consumer(cp);
 910         g_destroy_geom(gp);
 911         if (sc->sc_ekeys != NULL) {
 912                 bzero(sc->sc_ekeys,
 913                     sc->sc_nekeys * (sizeof(uint8_t *) + G_ELI_DATAKEYLEN));
 914                 free(sc->sc_ekeys, M_ELI);
 915         }
 916         bzero(sc, sizeof(*sc));
 917         free(sc, M_ELI);
 918         return (NULL);
 919 }
 920
 921 int
 922 g_eli_destroy(struct g_eli_softc *sc, boolean_t force)
 923 {
 924         struct g_geom *gp;
 925         struct g_provider *pp;
 926
 927         g_topology_assert();
 928
 929         if (sc == NULL)
 930                 return (ENXIO);
 931
 932         gp = sc->sc_geom;
 933         pp = LIST_FIRST(&gp->provider);
 934         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 935                 if (force) {
 936                         G_ELI_DEBUG(1, "Device %s is still open, so it "
 937                             "cannot be definitely removed.", pp->name);
 938                 } else {
 939                         G_ELI_DEBUG(1,
 940                             "Device %s is still open (r%dw%de%d).", pp->name,
 941                             pp->acr, pp->acw, pp->ace);
 942                         return (EBUSY);
 943                 }
 944         }
 945
 946         mtx_lock(&sc->sc_queue_mtx);
 947         sc->sc_flags |= G_ELI_FLAG_DESTROY;
 948         wakeup(sc);
 949         while (!LIST_EMPTY(&sc->sc_workers)) {
 950                 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
 951                     "geli:destroy", 0);
 952         }
 953         mtx_destroy(&sc->sc_queue_mtx);
 954         gp->softc = NULL;
 955         if (sc->sc_ekeys != NULL) {
 956                 /* The sc_ekeys field can be NULL is device is suspended. */
 957                 bzero(sc->sc_ekeys,
 958                     sc->sc_nekeys * (sizeof(uint8_t *) + G_ELI_DATAKEYLEN));
 959                 free(sc->sc_ekeys, M_ELI);
 960         }
 961         bzero(sc, sizeof(*sc));
 962         free(sc, M_ELI);
 963
 964         if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
 965                 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name);
 966         g_wither_geom_close(gp, ENXIO);
 967
 968         return (0);
 969 }
 970
 971 static int
 972 g_eli_destroy_geom(struct gctl_req *req __unused,
 973     struct g_class *mp __unused, struct g_geom *gp)
 974 {
 975         struct g_eli_softc *sc;
 976
 977         sc = gp->softc;
 978         return (g_eli_destroy(sc, FALSE));
 979 }
 980
 981 static int
 982 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider)
 983 {
 984         u_char *keyfile, *data, *size;
 985         char *file, name[64];
 986         int i;
 987
 988         for (i = 0; ; i++) {
 989                 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
 990                 keyfile = preload_search_by_type(name);
 991                 if (keyfile == NULL)
 992                         return (i);     /* Return number of loaded keyfiles. */
 993                 data = preload_search_info(keyfile, MODINFO_ADDR);
 994                 if (data == NULL) {
 995                         G_ELI_DEBUG(0, "Cannot find key file data for %s.",
 996                             name);
 997                         return (0);
 998                 }
 999                 data = *(void **)data;
1000                 size = preload_search_info(keyfile, MODINFO_SIZE);
1001                 if (size == NULL) {
1002                         G_ELI_DEBUG(0, "Cannot find key file size for %s.",
1003                             name);
1004                         return (0);
1005                 }
1006                 file = preload_search_info(keyfile, MODINFO_NAME);
1007                 if (file == NULL) {
1008                         G_ELI_DEBUG(0, "Cannot find key file name for %s.",
1009                             name);
1010                         return (0);
1011                 }
1012                 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file,
1013                     provider, name);
1014                 g_eli_crypto_hmac_update(ctx, data, *(size_t *)size);
1015         }
1016 }
1017
1018 static void
1019 g_eli_keyfiles_clear(const char *provider)
1020 {
1021         u_char *keyfile, *data, *size;
1022         char name[64];
1023         int i;
1024
1025         for (i = 0; ; i++) {
1026                 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
1027                 keyfile = preload_search_by_type(name);
1028                 if (keyfile == NULL)
1029                         return;
1030                 data = preload_search_info(keyfile, MODINFO_ADDR);
1031                 size = preload_search_info(keyfile, MODINFO_SIZE);
1032                 if (data == NULL || size == NULL)
1033                         continue;
1034                 data = *(void **)data;
1035                 bzero(data, *(size_t *)size);
1036         }
1037 }
1038
1039 /*
1040  * Tasting is only made on boot.
1041  * We detect providers which should be attached before root is mounted.
1042  */
1043 static struct g_geom *
1044 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
1045 {
1046         struct g_eli_metadata md;
1047         struct g_geom *gp;
1048         struct hmac_ctx ctx;
1049         char passphrase[256];
1050         u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN];
1051         u_int i, nkey, nkeyfiles, tries;
1052         int error;
1053
1054         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
1055         g_topology_assert();
1056
1057         if (root_mounted() || g_eli_tries == 0)
1058                 return (NULL);
1059
1060         G_ELI_DEBUG(3, "Tasting %s.", pp->name);
1061
1062         error = g_eli_read_metadata(mp, pp, &md);
1063         if (error != 0)
1064                 return (NULL);
1065         gp = NULL;
1066
1067         if (strcmp(md.md_magic, G_ELI_MAGIC) != 0)
1068                 return (NULL);
1069         if (md.md_version > G_ELI_VERSION) {
1070                 printf("geom_eli.ko module is too old to handle %s.\n",
1071                     pp->name);
1072                 return (NULL);
1073         }
1074         if (md.md_provsize != pp->mediasize)
1075                 return (NULL);
1076         /* Should we attach it on boot? */
1077         if (!(md.md_flags & G_ELI_FLAG_BOOT))
1078                 return (NULL);
1079         if (md.md_keys == 0x00) {
1080                 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name);
1081                 return (NULL);
1082         }
1083         if (md.md_iterations == -1) {
1084                 /* If there is no passphrase, we try only once. */
1085                 tries = 1;
1086         } else {
1087                 /* Ask for the passphrase no more than g_eli_tries times. */
1088                 tries = g_eli_tries;
1089         }
1090
1091         for (i = 0; i < tries; i++) {
1092                 g_eli_crypto_hmac_init(&ctx, NULL, 0);
1093
1094                 /*
1095                  * Load all key files.
1096                  */
1097                 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name);
1098
1099                 if (nkeyfiles == 0 && md.md_iterations == -1) {
1100                         /*
1101                          * No key files and no passphrase, something is
1102                          * definitely wrong here.
1103                          * geli(8) doesn't allow for such situation, so assume
1104                          * that there was really no passphrase and in that case
1105                          * key files are no properly defined in loader.conf.
1106                          */
1107                         G_ELI_DEBUG(0,
1108                             "Found no key files in loader.conf for %s.",
1109                             pp->name);
1110                         return (NULL);
1111                 }
1112
1113                 /* Ask for the passphrase if defined. */
1114                 if (md.md_iterations >= 0) {
1115                         printf("Enter passphrase for %s: ", pp->name);
1116                         gets(passphrase, sizeof(passphrase),
1117                             g_eli_visible_passphrase);
1118                 }
1119
1120                 /*
1121                  * Prepare Derived-Key from the user passphrase.
1122                  */
1123                 if (md.md_iterations == 0) {
1124                         g_eli_crypto_hmac_update(&ctx, md.md_salt,
1125                             sizeof(md.md_salt));
1126                         g_eli_crypto_hmac_update(&ctx, passphrase,
1127                             strlen(passphrase));
1128                         bzero(passphrase, sizeof(passphrase));
1129                 } else if (md.md_iterations > 0) {
1130                         u_char dkey[G_ELI_USERKEYLEN];
1131
1132                         pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
1133                             sizeof(md.md_salt), passphrase, md.md_iterations);
1134                         bzero(passphrase, sizeof(passphrase));
1135                         g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
1136                         bzero(dkey, sizeof(dkey));
1137                 }
1138
1139                 g_eli_crypto_hmac_final(&ctx, key, 0);
1140
1141                 /*
1142                  * Decrypt Master-Key.
1143                  */
1144                 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey);
1145                 bzero(key, sizeof(key));
1146                 if (error == -1) {
1147                         if (i == tries - 1) {
1148                                 G_ELI_DEBUG(0,
1149                                     "Wrong key for %s. No tries left.",
1150                                     pp->name);
1151                                 g_eli_keyfiles_clear(pp->name);
1152                                 return (NULL);
1153                         }
1154                         G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.",
1155                             pp->name, tries - i - 1);
1156                         /* Try again. */
1157                         continue;
1158                 } else if (error > 0) {
1159                         G_ELI_DEBUG(0, "Cannot decrypt Master Key for %s (error=%d).",
1160                             pp->name, error);
1161                         g_eli_keyfiles_clear(pp->name);
1162                         return (NULL);
1163                 }
1164                 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name);
1165                 break;
1166         }
1167
1168         /*
1169          * We have correct key, let's attach provider.
1170          */
1171         gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
1172         bzero(mkey, sizeof(mkey));
1173         bzero(&md, sizeof(md));
1174         if (gp == NULL) {
1175                 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
1176                     G_ELI_SUFFIX);
1177                 return (NULL);
1178         }
1179         return (gp);
1180 }
1181
1182 static void
1183 g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
1184     struct g_consumer *cp, struct g_provider *pp)
1185 {
1186         struct g_eli_softc *sc;
1187
1188         g_topology_assert();
1189         sc = gp->softc;
1190         if (sc == NULL)
1191                 return;
1192         if (pp != NULL || cp != NULL)
1193                 return; /* Nothing here. */
1194         sbuf_printf(sb, "%s<Flags>", indent);
1195         if (sc->sc_flags == 0)
1196                 sbuf_printf(sb, "NONE");
1197         else {
1198                 int first = 1;
1199
1200 #define ADD_FLAG(flag, name)    do {                                    \
1201         if (sc->sc_flags & (flag)) {                                    \
1202                 if (!first)                                             \
1203                         sbuf_printf(sb, ", ");                          \
1204                 else                                                    \
1205                         first = 0;                                      \
1206                 sbuf_printf(sb, name);                                  \
1207         }                                                               \
1208 } while (0)
1209                 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND");
1210                 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY");
1211                 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER");
1212                 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME");
1213                 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT");
1214                 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH");
1215                 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH");
1216                 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH");
1217                 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN");
1218                 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY");
1219                 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY");
1220 #undef  ADD_FLAG
1221         }
1222         sbuf_printf(sb, "</Flags>\n");
1223
1224         if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) {
1225                 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent,
1226                     sc->sc_nkey);
1227         }
1228         sbuf_printf(sb, "%s<Crypto>", indent);
1229         switch (sc->sc_crypto) {
1230         case G_ELI_CRYPTO_HW:
1231                 sbuf_printf(sb, "hardware");
1232                 break;
1233         case G_ELI_CRYPTO_SW:
1234                 sbuf_printf(sb, "software");
1235                 break;
1236         default:
1237                 sbuf_printf(sb, "UNKNOWN");
1238                 break;
1239         }
1240         sbuf_printf(sb, "</Crypto>\n");
1241         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
1242                 sbuf_printf(sb,
1243                     "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n",
1244                     indent, g_eli_algo2str(sc->sc_aalgo));
1245         }
1246         sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent,
1247             sc->sc_ekeylen);
1248         sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent,
1249             g_eli_algo2str(sc->sc_ealgo));
1250         sbuf_printf(sb, "%s<State>%s</State>\n", indent,
1251             (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE");
1252 }
1253
1254 static void
1255 g_eli_shutdown_pre_sync(void *arg, int howto)
1256 {
1257         struct g_class *mp;
1258         struct g_geom *gp, *gp2;
1259         struct g_provider *pp;
1260         struct g_eli_softc *sc;
1261         int error;
1262
1263         mp = arg;
1264         DROP_GIANT();
1265         g_topology_lock();
1266         LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
1267                 sc = gp->softc;
1268                 if (sc == NULL)
1269                         continue;
1270                 pp = LIST_FIRST(&gp->provider);
1271                 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name));
1272                 if (pp->acr + pp->acw + pp->ace == 0)
1273                         error = g_eli_destroy(sc, TRUE);
1274                 else {
1275                         sc->sc_flags |= G_ELI_FLAG_RW_DETACH;
1276                         gp->access = g_eli_access;
1277                 }
1278         }
1279         g_topology_unlock();
1280         PICKUP_GIANT();
1281 }
1282
1283 static void
1284 g_eli_init(struct g_class *mp)
1285 {
1286
1287         g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync,
1288             g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST);
1289         if (g_eli_pre_sync == NULL)
1290                 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event.");
1291 }
1292
1293 static void
1294 g_eli_fini(struct g_class *mp)
1295 {
1296
1297         if (g_eli_pre_sync != NULL)
1298                 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync);
1299 }
1300
1301 DECLARE_GEOM_CLASS(g_eli_class, g_eli);
1302 MODULE_DEPEND(g_eli, crypto, 1, 1, 1);