1/*- 2 * Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 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: releng/11.0/sys/geom/eli/g_eli.c 300288 2016-05-20 08:25:37Z kib $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/cons.h> 33#include <sys/kernel.h> 34#include <sys/linker.h> 35#include <sys/module.h> 36#include <sys/lock.h> 37#include <sys/mutex.h> 38#include <sys/bio.h> 39#include <sys/sbuf.h> 40#include <sys/sysctl.h> 41#include <sys/malloc.h> 42#include <sys/eventhandler.h> 43#include <sys/kthread.h> 44#include <sys/proc.h> 45#include <sys/sched.h> 46#include <sys/smp.h> 47#include <sys/uio.h> 48#include <sys/vnode.h> 49 50#include <vm/uma.h> 51 52#include <geom/geom.h> 53#include <geom/eli/g_eli.h> 54#include <geom/eli/pkcs5v2.h> 55 56FEATURE(geom_eli, "GEOM crypto module"); 57 58MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data"); 59 60SYSCTL_DECL(_kern_geom); 61SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff"); 62static int g_eli_version = G_ELI_VERSION; 63SYSCTL_INT(_kern_geom_eli, OID_AUTO, version, CTLFLAG_RD, &g_eli_version, 0, 64 "GELI version"); 65int g_eli_debug = 0; 66SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RWTUN, &g_eli_debug, 0, 67 "Debug level"); 68static u_int g_eli_tries = 3; 69SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RWTUN, &g_eli_tries, 0, 70 "Number of tries for entering the passphrase"); 71static u_int g_eli_visible_passphrase = GETS_NOECHO; 72SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RWTUN, 73 &g_eli_visible_passphrase, 0, 74 "Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)"); 75u_int g_eli_overwrites = G_ELI_OVERWRITES; 76SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RWTUN, &g_eli_overwrites, 77 0, "Number of times on-disk keys should be overwritten when destroying them"); 78static u_int g_eli_threads = 0; 79SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RWTUN, &g_eli_threads, 0, 80 "Number of threads doing crypto work"); 81u_int g_eli_batch = 0; 82SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RWTUN, &g_eli_batch, 0, 83 "Use crypto operations batching"); 84 85/* 86 * Passphrase cached during boot, in order to be more user-friendly if 87 * there are multiple providers using the same passphrase. 88 */ 89static char cached_passphrase[256]; 90static u_int g_eli_boot_passcache = 1; 91TUNABLE_INT("kern.geom.eli.boot_passcache", &g_eli_boot_passcache); 92SYSCTL_UINT(_kern_geom_eli, OID_AUTO, boot_passcache, CTLFLAG_RD, 93 &g_eli_boot_passcache, 0, 94 "Passphrases are cached during boot process for possible reuse"); 95static void 96fetch_loader_passphrase(void * dummy) 97{ 98 char * env_passphrase; 99 100 KASSERT(dynamic_kenv, ("need dynamic kenv")); 101 102 if ((env_passphrase = kern_getenv("kern.geom.eli.passphrase")) != NULL) { 103 /* Extract passphrase from the environment. */ 104 strlcpy(cached_passphrase, env_passphrase, 105 sizeof(cached_passphrase)); 106 freeenv(env_passphrase); 107 108 /* Wipe the passphrase from the environment. */ 109 kern_unsetenv("kern.geom.eli.passphrase"); 110 } 111} 112SYSINIT(geli_fetch_loader_passphrase, SI_SUB_KMEM + 1, SI_ORDER_ANY, 113 fetch_loader_passphrase, NULL); 114static void 115zero_boot_passcache(void * dummy) 116{ 117 118 memset(cached_passphrase, 0, sizeof(cached_passphrase)); 119} 120EVENTHANDLER_DEFINE(mountroot, zero_boot_passcache, NULL, 0); 121 122static eventhandler_tag g_eli_pre_sync = NULL; 123 124static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 125 struct g_geom *gp); 126static void g_eli_init(struct g_class *mp); 127static void g_eli_fini(struct g_class *mp); 128 129static g_taste_t g_eli_taste; 130static g_dumpconf_t g_eli_dumpconf; 131 132struct g_class g_eli_class = { 133 .name = G_ELI_CLASS_NAME, 134 .version = G_VERSION, 135 .ctlreq = g_eli_config, 136 .taste = g_eli_taste, 137 .destroy_geom = g_eli_destroy_geom, 138 .init = g_eli_init, 139 .fini = g_eli_fini 140}; 141 142 143/* 144 * Code paths: 145 * BIO_READ: 146 * 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 147 * BIO_WRITE: 148 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 149 */ 150 151 152/* 153 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto 154 * accelerator or something like this. 155 * The function updates the SID and rerun the operation. 156 */ 157int 158g_eli_crypto_rerun(struct cryptop *crp) 159{ 160 struct g_eli_softc *sc; 161 struct g_eli_worker *wr; 162 struct bio *bp; 163 int error; 164 165 bp = (struct bio *)crp->crp_opaque; 166 sc = bp->bio_to->geom->softc; 167 LIST_FOREACH(wr, &sc->sc_workers, w_next) { 168 if (wr->w_number == bp->bio_pflags) 169 break; 170 } 171 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags)); 172 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).", 173 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid, 174 (uintmax_t)crp->crp_sid); 175 wr->w_sid = crp->crp_sid; 176 crp->crp_etype = 0; 177 error = crypto_dispatch(crp); 178 if (error == 0) 179 return (0); 180 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error); 181 crp->crp_etype = error; 182 return (error); 183} 184 185/* 186 * The function is called afer reading encrypted data from the provider. 187 * 188 * 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 189 */ 190void 191g_eli_read_done(struct bio *bp) 192{ 193 struct g_eli_softc *sc; 194 struct bio *pbp; 195 196 G_ELI_LOGREQ(2, bp, "Request done."); 197 pbp = bp->bio_parent; 198 if (pbp->bio_error == 0 && bp->bio_error != 0) 199 pbp->bio_error = bp->bio_error; 200 g_destroy_bio(bp); 201 /* 202 * Do we have all sectors already? 203 */ 204 pbp->bio_inbed++; 205 if (pbp->bio_inbed < pbp->bio_children) 206 return; 207 sc = pbp->bio_to->geom->softc; 208 if (pbp->bio_error != 0) { 209 G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__, 210 pbp->bio_error); 211 pbp->bio_completed = 0; 212 if (pbp->bio_driver2 != NULL) { 213 free(pbp->bio_driver2, M_ELI); 214 pbp->bio_driver2 = NULL; 215 } 216 g_io_deliver(pbp, pbp->bio_error); 217 atomic_subtract_int(&sc->sc_inflight, 1); 218 return; 219 } 220 mtx_lock(&sc->sc_queue_mtx); 221 bioq_insert_tail(&sc->sc_queue, pbp); 222 mtx_unlock(&sc->sc_queue_mtx); 223 wakeup(sc); 224} 225 226/* 227 * The function is called after we encrypt and write data. 228 * 229 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver 230 */ 231void 232g_eli_write_done(struct bio *bp) 233{ 234 struct g_eli_softc *sc; 235 struct bio *pbp; 236 237 G_ELI_LOGREQ(2, bp, "Request done."); 238 pbp = bp->bio_parent; 239 if (pbp->bio_error == 0 && bp->bio_error != 0) 240 pbp->bio_error = bp->bio_error; 241 g_destroy_bio(bp); 242 /* 243 * Do we have all sectors already? 244 */ 245 pbp->bio_inbed++; 246 if (pbp->bio_inbed < pbp->bio_children) 247 return; 248 free(pbp->bio_driver2, M_ELI); 249 pbp->bio_driver2 = NULL; 250 if (pbp->bio_error != 0) { 251 G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__, 252 pbp->bio_error); 253 pbp->bio_completed = 0; 254 } else 255 pbp->bio_completed = pbp->bio_length; 256 257 /* 258 * Write is finished, send it up. 259 */ 260 sc = pbp->bio_to->geom->softc; 261 g_io_deliver(pbp, pbp->bio_error); 262 atomic_subtract_int(&sc->sc_inflight, 1); 263} 264 265/* 266 * This function should never be called, but GEOM made as it set ->orphan() 267 * method for every geom. 268 */ 269static void 270g_eli_orphan_spoil_assert(struct g_consumer *cp) 271{ 272 273 panic("Function %s() called for %s.", __func__, cp->geom->name); 274} 275 276static void 277g_eli_orphan(struct g_consumer *cp) 278{ 279 struct g_eli_softc *sc; 280 281 g_topology_assert(); 282 sc = cp->geom->softc; 283 if (sc == NULL) 284 return; 285 g_eli_destroy(sc, TRUE); 286} 287 288/* 289 * BIO_READ: 290 * 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 291 * BIO_WRITE: 292 * G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 293 */ 294static void 295g_eli_start(struct bio *bp) 296{ 297 struct g_eli_softc *sc; 298 struct g_consumer *cp; 299 struct bio *cbp; 300 301 sc = bp->bio_to->geom->softc; 302 KASSERT(sc != NULL, 303 ("Provider's error should be set (error=%d)(device=%s).", 304 bp->bio_to->error, bp->bio_to->name)); 305 G_ELI_LOGREQ(2, bp, "Request received."); 306 307 switch (bp->bio_cmd) { 308 case BIO_READ: 309 case BIO_WRITE: 310 case BIO_GETATTR: 311 case BIO_FLUSH: 312 case BIO_ZONE: 313 break; 314 case BIO_DELETE: 315 /* 316 * If the user hasn't set the NODELETE flag, we just pass 317 * it down the stack and let the layers beneath us do (or 318 * not) whatever they do with it. If they have, we 319 * reject it. A possible extension would be an 320 * additional flag to take it as a hint to shred the data 321 * with [multiple?] overwrites. 322 */ 323 if (!(sc->sc_flags & G_ELI_FLAG_NODELETE)) 324 break; 325 default: 326 g_io_deliver(bp, EOPNOTSUPP); 327 return; 328 } 329 cbp = g_clone_bio(bp); 330 if (cbp == NULL) { 331 g_io_deliver(bp, ENOMEM); 332 return; 333 } 334 bp->bio_driver1 = cbp; 335 bp->bio_pflags = G_ELI_NEW_BIO; 336 switch (bp->bio_cmd) { 337 case BIO_READ: 338 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) { 339 g_eli_crypto_read(sc, bp, 0); 340 break; 341 } 342 /* FALLTHROUGH */ 343 case BIO_WRITE: 344 mtx_lock(&sc->sc_queue_mtx); 345 bioq_insert_tail(&sc->sc_queue, bp); 346 mtx_unlock(&sc->sc_queue_mtx); 347 wakeup(sc); 348 break; 349 case BIO_GETATTR: 350 case BIO_FLUSH: 351 case BIO_DELETE: 352 case BIO_ZONE: 353 cbp->bio_done = g_std_done; 354 cp = LIST_FIRST(&sc->sc_geom->consumer); 355 cbp->bio_to = cp->provider; 356 G_ELI_LOGREQ(2, cbp, "Sending request."); 357 g_io_request(cbp, cp); 358 break; 359 } 360} 361 362static int 363g_eli_newsession(struct g_eli_worker *wr) 364{ 365 struct g_eli_softc *sc; 366 struct cryptoini crie, cria; 367 int error; 368 369 sc = wr->w_softc; 370 371 bzero(&crie, sizeof(crie)); 372 crie.cri_alg = sc->sc_ealgo; 373 crie.cri_klen = sc->sc_ekeylen; 374 if (sc->sc_ealgo == CRYPTO_AES_XTS) 375 crie.cri_klen <<= 1; 376 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) { 377 crie.cri_key = g_eli_key_hold(sc, 0, 378 LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize); 379 } else { 380 crie.cri_key = sc->sc_ekey; 381 } 382 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 383 bzero(&cria, sizeof(cria)); 384 cria.cri_alg = sc->sc_aalgo; 385 cria.cri_klen = sc->sc_akeylen; 386 cria.cri_key = sc->sc_akey; 387 crie.cri_next = &cria; 388 } 389 390 switch (sc->sc_crypto) { 391 case G_ELI_CRYPTO_SW: 392 error = crypto_newsession(&wr->w_sid, &crie, 393 CRYPTOCAP_F_SOFTWARE); 394 break; 395 case G_ELI_CRYPTO_HW: 396 error = crypto_newsession(&wr->w_sid, &crie, 397 CRYPTOCAP_F_HARDWARE); 398 break; 399 case G_ELI_CRYPTO_UNKNOWN: 400 error = crypto_newsession(&wr->w_sid, &crie, 401 CRYPTOCAP_F_HARDWARE); 402 if (error == 0) { 403 mtx_lock(&sc->sc_queue_mtx); 404 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 405 sc->sc_crypto = G_ELI_CRYPTO_HW; 406 mtx_unlock(&sc->sc_queue_mtx); 407 } else { 408 error = crypto_newsession(&wr->w_sid, &crie, 409 CRYPTOCAP_F_SOFTWARE); 410 mtx_lock(&sc->sc_queue_mtx); 411 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 412 sc->sc_crypto = G_ELI_CRYPTO_SW; 413 mtx_unlock(&sc->sc_queue_mtx); 414 } 415 break; 416 default: 417 panic("%s: invalid condition", __func__); 418 } 419 420 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) 421 g_eli_key_drop(sc, crie.cri_key); 422 423 return (error); 424} 425 426static void 427g_eli_freesession(struct g_eli_worker *wr) 428{ 429 430 crypto_freesession(wr->w_sid); 431} 432 433static void 434g_eli_cancel(struct g_eli_softc *sc) 435{ 436 struct bio *bp; 437 438 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 439 440 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 441 KASSERT(bp->bio_pflags == G_ELI_NEW_BIO, 442 ("Not new bio when canceling (bp=%p).", bp)); 443 g_io_deliver(bp, ENXIO); 444 } 445} 446 447static struct bio * 448g_eli_takefirst(struct g_eli_softc *sc) 449{ 450 struct bio *bp; 451 452 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 453 454 if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND)) 455 return (bioq_takefirst(&sc->sc_queue)); 456 /* 457 * Device suspended, so we skip new I/O requests. 458 */ 459 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 460 if (bp->bio_pflags != G_ELI_NEW_BIO) 461 break; 462 } 463 if (bp != NULL) 464 bioq_remove(&sc->sc_queue, bp); 465 return (bp); 466} 467 468/* 469 * This is the main function for kernel worker thread when we don't have 470 * hardware acceleration and we have to do cryptography in software. 471 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM 472 * threads with crypto work. 473 */ 474static void 475g_eli_worker(void *arg) 476{ 477 struct g_eli_softc *sc; 478 struct g_eli_worker *wr; 479 struct bio *bp; 480 int error; 481 482 wr = arg; 483 sc = wr->w_softc; 484#ifdef EARLY_AP_STARTUP 485 MPASS(!sc->sc_cpubind || smp_started); 486#elif defined(SMP) 487 /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */ 488 if (sc->sc_cpubind) { 489 while (!smp_started) 490 tsleep(wr, 0, "geli:smp", hz / 4); 491 } 492#endif 493 thread_lock(curthread); 494 sched_prio(curthread, PUSER); 495 if (sc->sc_cpubind) 496 sched_bind(curthread, wr->w_number % mp_ncpus); 497 thread_unlock(curthread); 498 499 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm); 500 501 for (;;) { 502 mtx_lock(&sc->sc_queue_mtx); 503again: 504 bp = g_eli_takefirst(sc); 505 if (bp == NULL) { 506 if (sc->sc_flags & G_ELI_FLAG_DESTROY) { 507 g_eli_cancel(sc); 508 LIST_REMOVE(wr, w_next); 509 g_eli_freesession(wr); 510 free(wr, M_ELI); 511 G_ELI_DEBUG(1, "Thread %s exiting.", 512 curthread->td_proc->p_comm); 513 wakeup(&sc->sc_workers); 514 mtx_unlock(&sc->sc_queue_mtx); 515 kproc_exit(0); 516 } 517 while (sc->sc_flags & G_ELI_FLAG_SUSPEND) { 518 if (sc->sc_inflight > 0) { 519 G_ELI_DEBUG(0, "inflight=%d", 520 sc->sc_inflight); 521 /* 522 * We still have inflight BIOs, so 523 * sleep and retry. 524 */ 525 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 526 "geli:inf", hz / 5); 527 goto again; 528 } 529 /* 530 * Suspend requested, mark the worker as 531 * suspended and go to sleep. 532 */ 533 if (wr->w_active) { 534 g_eli_freesession(wr); 535 wr->w_active = FALSE; 536 } 537 wakeup(&sc->sc_workers); 538 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 539 "geli:suspend", 0); 540 if (!wr->w_active && 541 !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) { 542 error = g_eli_newsession(wr); 543 KASSERT(error == 0, 544 ("g_eli_newsession() failed on resume (error=%d)", 545 error)); 546 wr->w_active = TRUE; 547 } 548 goto again; 549 } 550 msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0); 551 continue; 552 } 553 if (bp->bio_pflags == G_ELI_NEW_BIO) 554 atomic_add_int(&sc->sc_inflight, 1); 555 mtx_unlock(&sc->sc_queue_mtx); 556 if (bp->bio_pflags == G_ELI_NEW_BIO) { 557 bp->bio_pflags = 0; 558 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 559 if (bp->bio_cmd == BIO_READ) 560 g_eli_auth_read(sc, bp); 561 else 562 g_eli_auth_run(wr, bp); 563 } else { 564 if (bp->bio_cmd == BIO_READ) 565 g_eli_crypto_read(sc, bp, 1); 566 else 567 g_eli_crypto_run(wr, bp); 568 } 569 } else { 570 if (sc->sc_flags & G_ELI_FLAG_AUTH) 571 g_eli_auth_run(wr, bp); 572 else 573 g_eli_crypto_run(wr, bp); 574 } 575 } 576} 577 578int 579g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 580 struct g_eli_metadata *md) 581{ 582 struct g_geom *gp; 583 struct g_consumer *cp; 584 u_char *buf = NULL; 585 int error; 586 587 g_topology_assert(); 588 589 gp = g_new_geomf(mp, "eli:taste"); 590 gp->start = g_eli_start; 591 gp->access = g_std_access; 592 /* 593 * g_eli_read_metadata() is always called from the event thread. 594 * Our geom is created and destroyed in the same event, so there 595 * could be no orphan nor spoil event in the meantime. 596 */ 597 gp->orphan = g_eli_orphan_spoil_assert; 598 gp->spoiled = g_eli_orphan_spoil_assert; 599 cp = g_new_consumer(gp); 600 error = g_attach(cp, pp); 601 if (error != 0) 602 goto end; 603 error = g_access(cp, 1, 0, 0); 604 if (error != 0) 605 goto end; 606 g_topology_unlock(); 607 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 608 &error); 609 g_topology_lock(); 610 if (buf == NULL) 611 goto end; 612 error = eli_metadata_decode(buf, md); 613 if (error != 0) 614 goto end; 615 /* Metadata was read and decoded successfully. */ 616end: 617 if (buf != NULL) 618 g_free(buf); 619 if (cp->provider != NULL) { 620 if (cp->acr == 1) 621 g_access(cp, -1, 0, 0); 622 g_detach(cp); 623 } 624 g_destroy_consumer(cp); 625 g_destroy_geom(gp); 626 return (error); 627} 628 629/* 630 * The function is called when we had last close on provider and user requested 631 * to close it when this situation occur. 632 */ 633static void 634g_eli_last_close(void *arg, int flags __unused) 635{ 636 struct g_geom *gp; 637 char gpname[64]; 638 int error; 639 640 g_topology_assert(); 641 gp = arg; 642 strlcpy(gpname, gp->name, sizeof(gpname)); 643 error = g_eli_destroy(gp->softc, TRUE); 644 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 645 gpname, error)); 646 G_ELI_DEBUG(0, "Detached %s on last close.", gpname); 647} 648 649int 650g_eli_access(struct g_provider *pp, int dr, int dw, int de) 651{ 652 struct g_eli_softc *sc; 653 struct g_geom *gp; 654 655 gp = pp->geom; 656 sc = gp->softc; 657 658 if (dw > 0) { 659 if (sc->sc_flags & G_ELI_FLAG_RO) { 660 /* Deny write attempts. */ 661 return (EROFS); 662 } 663 /* Someone is opening us for write, we need to remember that. */ 664 sc->sc_flags |= G_ELI_FLAG_WOPEN; 665 return (0); 666 } 667 /* Is this the last close? */ 668 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 669 return (0); 670 671 /* 672 * Automatically detach on last close if requested. 673 */ 674 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 675 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 676 g_post_event(g_eli_last_close, gp, M_WAITOK, NULL); 677 } 678 return (0); 679} 680 681static int 682g_eli_cpu_is_disabled(int cpu) 683{ 684#ifdef SMP 685 return (CPU_ISSET(cpu, &hlt_cpus_mask)); 686#else 687 return (0); 688#endif 689} 690 691struct g_geom * 692g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 693 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 694{ 695 struct g_eli_softc *sc; 696 struct g_eli_worker *wr; 697 struct g_geom *gp; 698 struct g_provider *pp; 699 struct g_consumer *cp; 700 u_int i, threads; 701 int error; 702 703 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 704 705 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 706 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 707 gp->start = g_eli_start; 708 /* 709 * Spoiling can happen even though we have the provider open 710 * exclusively, e.g. through media change events. 711 */ 712 gp->spoiled = g_eli_orphan; 713 gp->orphan = g_eli_orphan; 714 gp->dumpconf = g_eli_dumpconf; 715 /* 716 * If detach-on-last-close feature is not enabled and we don't operate 717 * on read-only provider, we can simply use g_std_access(). 718 */ 719 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 720 gp->access = g_eli_access; 721 else 722 gp->access = g_std_access; 723 724 eli_metadata_softc(sc, md, bpp->sectorsize, bpp->mediasize); 725 sc->sc_nkey = nkey; 726 727 gp->softc = sc; 728 sc->sc_geom = gp; 729 730 bioq_init(&sc->sc_queue); 731 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 732 mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF); 733 734 pp = NULL; 735 cp = g_new_consumer(gp); 736 error = g_attach(cp, bpp); 737 if (error != 0) { 738 if (req != NULL) { 739 gctl_error(req, "Cannot attach to %s (error=%d).", 740 bpp->name, error); 741 } else { 742 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 743 bpp->name, error); 744 } 745 goto failed; 746 } 747 /* 748 * Keep provider open all the time, so we can run critical tasks, 749 * like Master Keys deletion, without wondering if we can open 750 * provider or not. 751 * We don't open provider for writing only when user requested read-only 752 * access. 753 */ 754 if (sc->sc_flags & G_ELI_FLAG_RO) 755 error = g_access(cp, 1, 0, 1); 756 else 757 error = g_access(cp, 1, 1, 1); 758 if (error != 0) { 759 if (req != NULL) { 760 gctl_error(req, "Cannot access %s (error=%d).", 761 bpp->name, error); 762 } else { 763 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 764 bpp->name, error); 765 } 766 goto failed; 767 } 768 769 /* 770 * Remember the keys in our softc structure. 771 */ 772 g_eli_mkey_propagate(sc, mkey); 773 774 LIST_INIT(&sc->sc_workers); 775 776 threads = g_eli_threads; 777 if (threads == 0) 778 threads = mp_ncpus; 779 sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus); 780 for (i = 0; i < threads; i++) { 781 if (g_eli_cpu_is_disabled(i)) { 782 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 783 bpp->name, i); 784 continue; 785 } 786 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 787 wr->w_softc = sc; 788 wr->w_number = i; 789 wr->w_active = TRUE; 790 791 error = g_eli_newsession(wr); 792 if (error != 0) { 793 free(wr, M_ELI); 794 if (req != NULL) { 795 gctl_error(req, "Cannot set up crypto session " 796 "for %s (error=%d).", bpp->name, error); 797 } else { 798 G_ELI_DEBUG(1, "Cannot set up crypto session " 799 "for %s (error=%d).", bpp->name, error); 800 } 801 goto failed; 802 } 803 804 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 805 "g_eli[%u] %s", i, bpp->name); 806 if (error != 0) { 807 g_eli_freesession(wr); 808 free(wr, M_ELI); 809 if (req != NULL) { 810 gctl_error(req, "Cannot create kernel thread " 811 "for %s (error=%d).", bpp->name, error); 812 } else { 813 G_ELI_DEBUG(1, "Cannot create kernel thread " 814 "for %s (error=%d).", bpp->name, error); 815 } 816 goto failed; 817 } 818 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 819 } 820 821 /* 822 * Create decrypted provider. 823 */ 824 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 825 pp->mediasize = sc->sc_mediasize; 826 pp->sectorsize = sc->sc_sectorsize; 827 828 g_error_provider(pp, 0); 829 830 G_ELI_DEBUG(0, "Device %s created.", pp->name); 831 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 832 sc->sc_ekeylen); 833 if (sc->sc_flags & G_ELI_FLAG_AUTH) 834 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 835 G_ELI_DEBUG(0, " Crypto: %s", 836 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 837 return (gp); 838failed: 839 mtx_lock(&sc->sc_queue_mtx); 840 sc->sc_flags |= G_ELI_FLAG_DESTROY; 841 wakeup(sc); 842 /* 843 * Wait for kernel threads self destruction. 844 */ 845 while (!LIST_EMPTY(&sc->sc_workers)) { 846 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 847 "geli:destroy", 0); 848 } 849 mtx_destroy(&sc->sc_queue_mtx); 850 if (cp->provider != NULL) { 851 if (cp->acr == 1) 852 g_access(cp, -1, -1, -1); 853 g_detach(cp); 854 } 855 g_destroy_consumer(cp); 856 g_destroy_geom(gp); 857 g_eli_key_destroy(sc); 858 bzero(sc, sizeof(*sc)); 859 free(sc, M_ELI); 860 return (NULL); 861} 862 863int 864g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 865{ 866 struct g_geom *gp; 867 struct g_provider *pp; 868 869 g_topology_assert(); 870 871 if (sc == NULL) 872 return (ENXIO); 873 874 gp = sc->sc_geom; 875 pp = LIST_FIRST(&gp->provider); 876 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 877 if (force) { 878 G_ELI_DEBUG(1, "Device %s is still open, so it " 879 "cannot be definitely removed.", pp->name); 880 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 881 gp->access = g_eli_access; 882 g_wither_provider(pp, ENXIO); 883 return (EBUSY); 884 } else { 885 G_ELI_DEBUG(1, 886 "Device %s is still open (r%dw%de%d).", pp->name, 887 pp->acr, pp->acw, pp->ace); 888 return (EBUSY); 889 } 890 } 891 892 mtx_lock(&sc->sc_queue_mtx); 893 sc->sc_flags |= G_ELI_FLAG_DESTROY; 894 wakeup(sc); 895 while (!LIST_EMPTY(&sc->sc_workers)) { 896 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 897 "geli:destroy", 0); 898 } 899 mtx_destroy(&sc->sc_queue_mtx); 900 gp->softc = NULL; 901 g_eli_key_destroy(sc); 902 bzero(sc, sizeof(*sc)); 903 free(sc, M_ELI); 904 905 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 906 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 907 g_wither_geom_close(gp, ENXIO); 908 909 return (0); 910} 911 912static int 913g_eli_destroy_geom(struct gctl_req *req __unused, 914 struct g_class *mp __unused, struct g_geom *gp) 915{ 916 struct g_eli_softc *sc; 917 918 sc = gp->softc; 919 return (g_eli_destroy(sc, FALSE)); 920} 921 922static int 923g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 924{ 925 u_char *keyfile, *data; 926 char *file, name[64]; 927 size_t size; 928 int i; 929 930 for (i = 0; ; i++) { 931 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 932 keyfile = preload_search_by_type(name); 933 if (keyfile == NULL && i == 0) { 934 /* 935 * If there is only one keyfile, allow simpler name. 936 */ 937 snprintf(name, sizeof(name), "%s:geli_keyfile", provider); 938 keyfile = preload_search_by_type(name); 939 } 940 if (keyfile == NULL) 941 return (i); /* Return number of loaded keyfiles. */ 942 data = preload_fetch_addr(keyfile); 943 if (data == NULL) { 944 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 945 name); 946 return (0); 947 } 948 size = preload_fetch_size(keyfile); 949 if (size == 0) { 950 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 951 name); 952 return (0); 953 } 954 file = preload_search_info(keyfile, MODINFO_NAME); 955 if (file == NULL) { 956 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 957 name); 958 return (0); 959 } 960 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 961 provider, name); 962 g_eli_crypto_hmac_update(ctx, data, size); 963 } 964} 965 966static void 967g_eli_keyfiles_clear(const char *provider) 968{ 969 u_char *keyfile, *data; 970 char name[64]; 971 size_t size; 972 int i; 973 974 for (i = 0; ; i++) { 975 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 976 keyfile = preload_search_by_type(name); 977 if (keyfile == NULL) 978 return; 979 data = preload_fetch_addr(keyfile); 980 size = preload_fetch_size(keyfile); 981 if (data != NULL && size != 0) 982 bzero(data, size); 983 } 984} 985 986/* 987 * Tasting is only made on boot. 988 * We detect providers which should be attached before root is mounted. 989 */ 990static struct g_geom * 991g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 992{ 993 struct g_eli_metadata md; 994 struct g_geom *gp; 995 struct hmac_ctx ctx; 996 char passphrase[256]; 997 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 998 u_int i, nkey, nkeyfiles, tries; 999 int error; 1000 1001 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1002 g_topology_assert(); 1003 1004 if (root_mounted() || g_eli_tries == 0) 1005 return (NULL); 1006 1007 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1008 1009 error = g_eli_read_metadata(mp, pp, &md); 1010 if (error != 0) 1011 return (NULL); 1012 gp = NULL; 1013 1014 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1015 return (NULL); 1016 if (md.md_version > G_ELI_VERSION) { 1017 printf("geom_eli.ko module is too old to handle %s.\n", 1018 pp->name); 1019 return (NULL); 1020 } 1021 if (md.md_provsize != pp->mediasize) 1022 return (NULL); 1023 /* Should we attach it on boot? */ 1024 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1025 return (NULL); 1026 if (md.md_keys == 0x00) { 1027 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1028 return (NULL); 1029 } 1030 if (md.md_iterations == -1) { 1031 /* If there is no passphrase, we try only once. */ 1032 tries = 1; 1033 } else { 1034 /* Ask for the passphrase no more than g_eli_tries times. */ 1035 tries = g_eli_tries; 1036 } 1037 1038 for (i = 0; i <= tries; i++) { 1039 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1040 1041 /* 1042 * Load all key files. 1043 */ 1044 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1045 1046 if (nkeyfiles == 0 && md.md_iterations == -1) { 1047 /* 1048 * No key files and no passphrase, something is 1049 * definitely wrong here. 1050 * geli(8) doesn't allow for such situation, so assume 1051 * that there was really no passphrase and in that case 1052 * key files are no properly defined in loader.conf. 1053 */ 1054 G_ELI_DEBUG(0, 1055 "Found no key files in loader.conf for %s.", 1056 pp->name); 1057 return (NULL); 1058 } 1059 1060 /* Ask for the passphrase if defined. */ 1061 if (md.md_iterations >= 0) { 1062 /* Try first with cached passphrase. */ 1063 if (i == 0) { 1064 if (!g_eli_boot_passcache) 1065 continue; 1066 memcpy(passphrase, cached_passphrase, 1067 sizeof(passphrase)); 1068 } else { 1069 printf("Enter passphrase for %s: ", pp->name); 1070 cngets(passphrase, sizeof(passphrase), 1071 g_eli_visible_passphrase); 1072 memcpy(cached_passphrase, passphrase, 1073 sizeof(passphrase)); 1074 } 1075 } 1076 1077 /* 1078 * Prepare Derived-Key from the user passphrase. 1079 */ 1080 if (md.md_iterations == 0) { 1081 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1082 sizeof(md.md_salt)); 1083 g_eli_crypto_hmac_update(&ctx, passphrase, 1084 strlen(passphrase)); 1085 bzero(passphrase, sizeof(passphrase)); 1086 } else if (md.md_iterations > 0) { 1087 u_char dkey[G_ELI_USERKEYLEN]; 1088 1089 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1090 sizeof(md.md_salt), passphrase, md.md_iterations); 1091 bzero(passphrase, sizeof(passphrase)); 1092 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1093 bzero(dkey, sizeof(dkey)); 1094 } 1095 1096 g_eli_crypto_hmac_final(&ctx, key, 0); 1097 1098 /* 1099 * Decrypt Master-Key. 1100 */ 1101 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1102 bzero(key, sizeof(key)); 1103 if (error == -1) { 1104 if (i == tries) { 1105 G_ELI_DEBUG(0, 1106 "Wrong key for %s. No tries left.", 1107 pp->name); 1108 g_eli_keyfiles_clear(pp->name); 1109 return (NULL); 1110 } 1111 if (i > 0) { 1112 G_ELI_DEBUG(0, 1113 "Wrong key for %s. Tries left: %u.", 1114 pp->name, tries - i); 1115 } 1116 /* Try again. */ 1117 continue; 1118 } else if (error > 0) { 1119 G_ELI_DEBUG(0, 1120 "Cannot decrypt Master Key for %s (error=%d).", 1121 pp->name, error); 1122 g_eli_keyfiles_clear(pp->name); 1123 return (NULL); 1124 } 1125 g_eli_keyfiles_clear(pp->name); 1126 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1127 break; 1128 } 1129 1130 /* 1131 * We have correct key, let's attach provider. 1132 */ 1133 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1134 bzero(mkey, sizeof(mkey)); 1135 bzero(&md, sizeof(md)); 1136 if (gp == NULL) { 1137 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1138 G_ELI_SUFFIX); 1139 return (NULL); 1140 } 1141 return (gp); 1142} 1143 1144static void 1145g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1146 struct g_consumer *cp, struct g_provider *pp) 1147{ 1148 struct g_eli_softc *sc; 1149 1150 g_topology_assert(); 1151 sc = gp->softc; 1152 if (sc == NULL) 1153 return; 1154 if (pp != NULL || cp != NULL) 1155 return; /* Nothing here. */ 1156 1157 sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>\n", indent, 1158 (uintmax_t)sc->sc_ekeys_total); 1159 sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>\n", indent, 1160 (uintmax_t)sc->sc_ekeys_allocated); 1161 sbuf_printf(sb, "%s<Flags>", indent); 1162 if (sc->sc_flags == 0) 1163 sbuf_printf(sb, "NONE"); 1164 else { 1165 int first = 1; 1166 1167#define ADD_FLAG(flag, name) do { \ 1168 if (sc->sc_flags & (flag)) { \ 1169 if (!first) \ 1170 sbuf_printf(sb, ", "); \ 1171 else \ 1172 first = 0; \ 1173 sbuf_printf(sb, name); \ 1174 } \ 1175} while (0) 1176 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND"); 1177 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY"); 1178 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1179 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1180 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1181 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1182 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1183 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1184 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1185 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1186 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1187 ADD_FLAG(G_ELI_FLAG_NODELETE, "NODELETE"); 1188 ADD_FLAG(G_ELI_FLAG_GELIBOOT, "GELIBOOT"); 1189#undef ADD_FLAG 1190 } 1191 sbuf_printf(sb, "</Flags>\n"); 1192 1193 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1194 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1195 sc->sc_nkey); 1196 } 1197 sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version); 1198 sbuf_printf(sb, "%s<Crypto>", indent); 1199 switch (sc->sc_crypto) { 1200 case G_ELI_CRYPTO_HW: 1201 sbuf_printf(sb, "hardware"); 1202 break; 1203 case G_ELI_CRYPTO_SW: 1204 sbuf_printf(sb, "software"); 1205 break; 1206 default: 1207 sbuf_printf(sb, "UNKNOWN"); 1208 break; 1209 } 1210 sbuf_printf(sb, "</Crypto>\n"); 1211 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1212 sbuf_printf(sb, 1213 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1214 indent, g_eli_algo2str(sc->sc_aalgo)); 1215 } 1216 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1217 sc->sc_ekeylen); 1218 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", 1219 indent, g_eli_algo2str(sc->sc_ealgo)); 1220 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1221 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1222} 1223 1224static void 1225g_eli_shutdown_pre_sync(void *arg, int howto) 1226{ 1227 struct g_class *mp; 1228 struct g_geom *gp, *gp2; 1229 struct g_provider *pp; 1230 struct g_eli_softc *sc; 1231 int error; 1232 1233 mp = arg; 1234 g_topology_lock(); 1235 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1236 sc = gp->softc; 1237 if (sc == NULL) 1238 continue; 1239 pp = LIST_FIRST(&gp->provider); 1240 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1241 if (pp->acr + pp->acw + pp->ace == 0) 1242 error = g_eli_destroy(sc, TRUE); 1243 else { 1244 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1245 gp->access = g_eli_access; 1246 } 1247 } 1248 g_topology_unlock(); 1249} 1250 1251static void 1252g_eli_init(struct g_class *mp) 1253{ 1254 1255 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1256 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1257 if (g_eli_pre_sync == NULL) 1258 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1259} 1260 1261static void 1262g_eli_fini(struct g_class *mp) 1263{ 1264 1265 if (g_eli_pre_sync != NULL) 1266 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1267} 1268 1269DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1270MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1271