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