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