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 TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug); 67 SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0, 68 "Debug level"); 69 static u_int g_eli_tries = 3; 70 TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries); 71 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0, 72 "Number of tries for entering the passphrase"); 73 static u_int g_eli_visible_passphrase = GETS_NOECHO; 74 TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase); 75 SYSCTL_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)"); 78 u_int g_eli_overwrites = G_ELI_OVERWRITES; 79 TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites); 80 SYSCTL_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"); 82 static u_int g_eli_threads = 0; 83 TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads); 84 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0, 85 "Number of threads doing crypto work"); 86 u_int g_eli_batch = 0; 87 TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch); 88 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0, 89 "Use crypto operations batching"); 90 91 static eventhandler_tag g_eli_pre_sync = NULL; 92 93 static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 94 struct g_geom *gp); 95 static void g_eli_init(struct g_class *mp); 96 static void g_eli_fini(struct g_class *mp); 97 98 static g_taste_t g_eli_taste; 99 static g_dumpconf_t g_eli_dumpconf; 100 101 struct 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 */ 126 int 127 g_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 */ 159 void 160 g_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 */ 199 void 200 g_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 */ 238 static void 239 g_eli_orphan_spoil_assert(struct g_consumer *cp) 240 { 241 242 panic("Function %s() called for %s.", __func__, cp->geom->name); 243 } 244 245 static void 246 g_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 */ 263 static void 264 g_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 } 322 323 static int 324 g_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 } 386 387 static void 388 g_eli_freesession(struct g_eli_worker *wr) 389 { 390 391 crypto_freesession(wr->w_sid); 392 } 393 394 static void 395 g_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 } 407 408 static struct bio * 409 g_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 */ 435 static void 436 g_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); 462 again: 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", 479 sc->sc_inflight); 480 /* 481 * We still have inflight BIOs, so 482 * sleep and retry. 483 */ 484 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 485 "geli:inf", hz / 5); 486 goto again; 487 } 488 /* 489 * Suspend requested, mark the worker as 490 * suspended and go to sleep. 491 */ 492 if (wr->w_active) { 493 g_eli_freesession(wr); 494 wr->w_active = FALSE; 495 } 496 wakeup(&sc->sc_workers); 497 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 498 "geli:suspend", 0); 499 if (!wr->w_active && 500 !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) { 501 error = g_eli_newsession(wr); 502 KASSERT(error == 0, 503 ("g_eli_newsession() failed on resume (error=%d)", 504 error)); 505 wr->w_active = TRUE; 506 } 507 goto again; 508 } 509 msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0); 510 continue; 511 } 512 if (bp->bio_pflags == G_ELI_NEW_BIO) 513 atomic_add_int(&sc->sc_inflight, 1); 514 mtx_unlock(&sc->sc_queue_mtx); 515 if (bp->bio_pflags == G_ELI_NEW_BIO) { 516 bp->bio_pflags = 0; 517 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 518 if (bp->bio_cmd == BIO_READ) 519 g_eli_auth_read(sc, bp); 520 else 521 g_eli_auth_run(wr, bp); 522 } else { 523 if (bp->bio_cmd == BIO_READ) 524 g_eli_crypto_read(sc, bp, 1); 525 else 526 g_eli_crypto_run(wr, bp); 527 } 528 } else { 529 if (sc->sc_flags & G_ELI_FLAG_AUTH) 530 g_eli_auth_run(wr, bp); 531 else 532 g_eli_crypto_run(wr, bp); 533 } 534 } 535 } 536 537 /* 538 * Here we generate IV. It is unique for every sector. 539 */ 540 void 541 g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 542 size_t size) 543 { 544 uint8_t off[8]; 545 546 if ((sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER) != 0) 547 bcopy(&offset, off, sizeof(off)); 548 else 549 le64enc(off, (uint64_t)offset); 550 551 switch (sc->sc_ealgo) { 552 case CRYPTO_AES_XTS: 553 bcopy(off, iv, sizeof(off)); 554 bzero(iv + sizeof(off), size - sizeof(off)); 555 break; 556 default: 557 { 558 u_char hash[SHA256_DIGEST_LENGTH]; 559 SHA256_CTX ctx; 560 561 /* Copy precalculated SHA256 context for IV-Key. */ 562 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx)); 563 SHA256_Update(&ctx, off, sizeof(off)); 564 SHA256_Final(hash, &ctx); 565 bcopy(hash, iv, MIN(sizeof(hash), size)); 566 break; 567 } 568 } 569 } 570 571 int 572 g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 573 struct g_eli_metadata *md) 574 { 575 struct g_geom *gp; 576 struct g_consumer *cp; 577 u_char *buf = NULL; 578 int error; 579 580 g_topology_assert(); 581 582 gp = g_new_geomf(mp, "eli:taste"); 583 gp->start = g_eli_start; 584 gp->access = g_std_access; 585 /* 586 * g_eli_read_metadata() is always called from the event thread. 587 * Our geom is created and destroyed in the same event, so there 588 * could be no orphan nor spoil event in the meantime. 589 */ 590 gp->orphan = g_eli_orphan_spoil_assert; 591 gp->spoiled = g_eli_orphan_spoil_assert; 592 cp = g_new_consumer(gp); 593 error = g_attach(cp, pp); 594 if (error != 0) 595 goto end; 596 error = g_access(cp, 1, 0, 0); 597 if (error != 0) 598 goto end; 599 g_topology_unlock(); 600 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 601 &error); 602 g_topology_lock(); 603 if (buf == NULL) 604 goto end; 605 eli_metadata_decode(buf, md); 606 end: 607 if (buf != NULL) 608 g_free(buf); 609 if (cp->provider != NULL) { 610 if (cp->acr == 1) 611 g_access(cp, -1, 0, 0); 612 g_detach(cp); 613 } 614 g_destroy_consumer(cp); 615 g_destroy_geom(gp); 616 return (error); 617 } 618 619 /* 620 * The function is called when we had last close on provider and user requested 621 * to close it when this situation occur. 622 */ 623 static void 624 g_eli_last_close(struct g_eli_softc *sc) 625 { 626 struct g_geom *gp; 627 struct g_provider *pp; 628 char ppname[64]; 629 int error; 630 631 g_topology_assert(); 632 gp = sc->sc_geom; 633 pp = LIST_FIRST(&gp->provider); 634 strlcpy(ppname, pp->name, sizeof(ppname)); 635 error = g_eli_destroy(sc, TRUE); 636 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 637 ppname, error)); 638 G_ELI_DEBUG(0, "Detached %s on last close.", ppname); 639 } 640 641 int 642 g_eli_access(struct g_provider *pp, int dr, int dw, int de) 643 { 644 struct g_eli_softc *sc; 645 struct g_geom *gp; 646 647 gp = pp->geom; 648 sc = gp->softc; 649 650 if (dw > 0) { 651 if (sc->sc_flags & G_ELI_FLAG_RO) { 652 /* Deny write attempts. */ 653 return (EROFS); 654 } 655 /* Someone is opening us for write, we need to remember that. */ 656 sc->sc_flags |= G_ELI_FLAG_WOPEN; 657 return (0); 658 } 659 /* Is this the last close? */ 660 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 661 return (0); 662 663 /* 664 * Automatically detach on last close if requested. 665 */ 666 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 667 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 668 g_eli_last_close(sc); 669 } 670 return (0); 671 } 672 673 static int 674 g_eli_cpu_is_disabled(int cpu) 675 { 676 #ifdef SMP 677 return (CPU_ISSET(cpu, &hlt_cpus_mask)); 678 #else 679 return (0); 680 #endif 681 } 682 683 struct g_geom * 684 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 685 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 686 { 687 struct g_eli_softc *sc; 688 struct g_eli_worker *wr; 689 struct g_geom *gp; 690 struct g_provider *pp; 691 struct g_consumer *cp; 692 u_int i, threads; 693 int error; 694 695 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 696 697 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 698 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 699 gp->start = g_eli_start; 700 /* 701 * Spoiling cannot happen actually, because we keep provider open for 702 * writing all the time or provider is read-only. 703 */ 704 gp->spoiled = g_eli_orphan_spoil_assert; 705 gp->orphan = g_eli_orphan; 706 gp->dumpconf = g_eli_dumpconf; 707 /* 708 * If detach-on-last-close feature is not enabled and we don't operate 709 * on read-only provider, we can simply use g_std_access(). 710 */ 711 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 712 gp->access = g_eli_access; 713 else 714 gp->access = g_std_access; 715 716 sc->sc_version = md->md_version; 717 sc->sc_inflight = 0; 718 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 719 sc->sc_flags = md->md_flags; 720 /* Backward compatibility. */ 721 if (md->md_version < G_ELI_VERSION_04) 722 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 723 if (md->md_version < G_ELI_VERSION_05) 724 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 725 if (md->md_version < G_ELI_VERSION_06 && 726 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 727 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 728 } 729 if (md->md_version < G_ELI_VERSION_07) 730 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 731 sc->sc_ealgo = md->md_ealgo; 732 sc->sc_nkey = nkey; 733 734 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 735 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 736 sc->sc_aalgo = md->md_aalgo; 737 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 738 739 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 740 /* 741 * Some hash functions (like SHA1 and RIPEMD160) generates hash 742 * which length is not multiple of 128 bits, but we want data 743 * length to be multiple of 128, so we can encrypt without 744 * padding. The line below rounds down data length to multiple 745 * of 128 bits. 746 */ 747 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 748 749 sc->sc_bytes_per_sector = 750 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 751 sc->sc_bytes_per_sector *= bpp->sectorsize; 752 } 753 754 gp->softc = sc; 755 sc->sc_geom = gp; 756 757 bioq_init(&sc->sc_queue); 758 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 759 mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF); 760 761 pp = NULL; 762 cp = g_new_consumer(gp); 763 error = g_attach(cp, bpp); 764 if (error != 0) { 765 if (req != NULL) { 766 gctl_error(req, "Cannot attach to %s (error=%d).", 767 bpp->name, error); 768 } else { 769 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 770 bpp->name, error); 771 } 772 goto failed; 773 } 774 /* 775 * Keep provider open all the time, so we can run critical tasks, 776 * like Master Keys deletion, without wondering if we can open 777 * provider or not. 778 * We don't open provider for writing only when user requested read-only 779 * access. 780 */ 781 if (sc->sc_flags & G_ELI_FLAG_RO) 782 error = g_access(cp, 1, 0, 1); 783 else 784 error = g_access(cp, 1, 1, 1); 785 if (error != 0) { 786 if (req != NULL) { 787 gctl_error(req, "Cannot access %s (error=%d).", 788 bpp->name, error); 789 } else { 790 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 791 bpp->name, error); 792 } 793 goto failed; 794 } 795 796 sc->sc_sectorsize = md->md_sectorsize; 797 sc->sc_mediasize = bpp->mediasize; 798 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 799 sc->sc_mediasize -= bpp->sectorsize; 800 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 801 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 802 else { 803 sc->sc_mediasize /= sc->sc_bytes_per_sector; 804 sc->sc_mediasize *= sc->sc_sectorsize; 805 } 806 807 /* 808 * Remember the keys in our softc structure. 809 */ 810 g_eli_mkey_propagate(sc, mkey); 811 sc->sc_ekeylen = md->md_keylen; 812 813 LIST_INIT(&sc->sc_workers); 814 815 threads = g_eli_threads; 816 if (threads == 0) 817 threads = mp_ncpus; 818 sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus); 819 for (i = 0; i < threads; i++) { 820 if (g_eli_cpu_is_disabled(i)) { 821 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 822 bpp->name, i); 823 continue; 824 } 825 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 826 wr->w_softc = sc; 827 wr->w_number = i; 828 wr->w_active = TRUE; 829 830 error = g_eli_newsession(wr); 831 if (error != 0) { 832 free(wr, M_ELI); 833 if (req != NULL) { 834 gctl_error(req, "Cannot set up crypto session " 835 "for %s (error=%d).", bpp->name, error); 836 } else { 837 G_ELI_DEBUG(1, "Cannot set up crypto session " 838 "for %s (error=%d).", bpp->name, error); 839 } 840 goto failed; 841 } 842 843 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 844 "g_eli[%u] %s", i, bpp->name); 845 if (error != 0) { 846 g_eli_freesession(wr); 847 free(wr, M_ELI); 848 if (req != NULL) { 849 gctl_error(req, "Cannot create kernel thread " 850 "for %s (error=%d).", bpp->name, error); 851 } else { 852 G_ELI_DEBUG(1, "Cannot create kernel thread " 853 "for %s (error=%d).", bpp->name, error); 854 } 855 goto failed; 856 } 857 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 858 } 859 860 /* 861 * Create decrypted provider. 862 */ 863 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 864 pp->mediasize = sc->sc_mediasize; 865 pp->sectorsize = sc->sc_sectorsize; 866 867 g_error_provider(pp, 0); 868 869 G_ELI_DEBUG(0, "Device %s created.", pp->name); 870 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 871 sc->sc_ekeylen); 872 if (sc->sc_flags & G_ELI_FLAG_AUTH) 873 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 874 G_ELI_DEBUG(0, " Crypto: %s", 875 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 876 return (gp); 877 failed: 878 mtx_lock(&sc->sc_queue_mtx); 879 sc->sc_flags |= G_ELI_FLAG_DESTROY; 880 wakeup(sc); 881 /* 882 * Wait for kernel threads self destruction. 883 */ 884 while (!LIST_EMPTY(&sc->sc_workers)) { 885 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 886 "geli:destroy", 0); 887 } 888 mtx_destroy(&sc->sc_queue_mtx); 889 if (cp->provider != NULL) { 890 if (cp->acr == 1) 891 g_access(cp, -1, -1, -1); 892 g_detach(cp); 893 } 894 g_destroy_consumer(cp); 895 g_destroy_geom(gp); 896 g_eli_key_destroy(sc); 897 bzero(sc, sizeof(*sc)); 898 free(sc, M_ELI); 899 return (NULL); 900 } 901 902 int 903 g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 904 { 905 struct g_geom *gp; 906 struct g_provider *pp; 907 908 g_topology_assert(); 909 910 if (sc == NULL) 911 return (ENXIO); 912 913 gp = sc->sc_geom; 914 pp = LIST_FIRST(&gp->provider); 915 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 916 if (force) { 917 G_ELI_DEBUG(1, "Device %s is still open, so it " 918 "cannot be definitely removed.", pp->name); 919 } else { 920 G_ELI_DEBUG(1, 921 "Device %s is still open (r%dw%de%d).", pp->name, 922 pp->acr, pp->acw, pp->ace); 923 return (EBUSY); 924 } 925 } 926 927 mtx_lock(&sc->sc_queue_mtx); 928 sc->sc_flags |= G_ELI_FLAG_DESTROY; 929 wakeup(sc); 930 while (!LIST_EMPTY(&sc->sc_workers)) { 931 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 932 "geli:destroy", 0); 933 } 934 mtx_destroy(&sc->sc_queue_mtx); 935 gp->softc = NULL; 936 g_eli_key_destroy(sc); 937 bzero(sc, sizeof(*sc)); 938 free(sc, M_ELI); 939 940 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 941 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 942 g_wither_geom_close(gp, ENXIO); 943 944 return (0); 945 } 946 947 static int 948 g_eli_destroy_geom(struct gctl_req *req __unused, 949 struct g_class *mp __unused, struct g_geom *gp) 950 { 951 struct g_eli_softc *sc; 952 953 sc = gp->softc; 954 return (g_eli_destroy(sc, FALSE)); 955 } 956 957 static int 958 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 959 { 960 u_char *keyfile, *data; 961 char *file, name[64]; 962 size_t size; 963 int i; 964 965 for (i = 0; ; i++) { 966 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 967 keyfile = preload_search_by_type(name); 968 if (keyfile == NULL) 969 return (i); /* Return number of loaded keyfiles. */ 970 data = preload_fetch_addr(keyfile); 971 if (data == NULL) { 972 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 973 name); 974 return (0); 975 } 976 size = preload_fetch_size(keyfile); 977 if (size == 0) { 978 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 979 name); 980 return (0); 981 } 982 file = preload_search_info(keyfile, MODINFO_NAME); 983 if (file == NULL) { 984 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 985 name); 986 return (0); 987 } 988 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 989 provider, name); 990 g_eli_crypto_hmac_update(ctx, data, size); 991 } 992 } 993 994 static void 995 g_eli_keyfiles_clear(const char *provider) 996 { 997 u_char *keyfile, *data; 998 char name[64]; 999 size_t size; 1000 int i; 1001 1002 for (i = 0; ; i++) { 1003 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1004 keyfile = preload_search_by_type(name); 1005 if (keyfile == NULL) 1006 return; 1007 data = preload_fetch_addr(keyfile); 1008 size = preload_fetch_size(keyfile); 1009 if (data != NULL && size != 0) 1010 bzero(data, size); 1011 } 1012 } 1013 1014 /* 1015 * Tasting is only made on boot. 1016 * We detect providers which should be attached before root is mounted. 1017 */ 1018 static struct g_geom * 1019 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 1020 { 1021 struct g_eli_metadata md; 1022 struct g_geom *gp; 1023 struct hmac_ctx ctx; 1024 char passphrase[256]; 1025 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 1026 u_int i, nkey, nkeyfiles, tries; 1027 int error; 1028 1029 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1030 g_topology_assert(); 1031 1032 if (root_mounted() || g_eli_tries == 0) 1033 return (NULL); 1034 1035 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1036 1037 error = g_eli_read_metadata(mp, pp, &md); 1038 if (error != 0) 1039 return (NULL); 1040 gp = NULL; 1041 1042 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1043 return (NULL); 1044 if (md.md_version > G_ELI_VERSION) { 1045 printf("geom_eli.ko module is too old to handle %s.\n", 1046 pp->name); 1047 return (NULL); 1048 } 1049 if (md.md_provsize != pp->mediasize) 1050 return (NULL); 1051 /* Should we attach it on boot? */ 1052 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1053 return (NULL); 1054 if (md.md_keys == 0x00) { 1055 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1056 return (NULL); 1057 } 1058 if (md.md_iterations == -1) { 1059 /* If there is no passphrase, we try only once. */ 1060 tries = 1; 1061 } else { 1062 /* Ask for the passphrase no more than g_eli_tries times. */ 1063 tries = g_eli_tries; 1064 } 1065 1066 for (i = 0; i < tries; i++) { 1067 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1068 1069 /* 1070 * Load all key files. 1071 */ 1072 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1073 1074 if (nkeyfiles == 0 && md.md_iterations == -1) { 1075 /* 1076 * No key files and no passphrase, something is 1077 * definitely wrong here. 1078 * geli(8) doesn't allow for such situation, so assume 1079 * that there was really no passphrase and in that case 1080 * key files are no properly defined in loader.conf. 1081 */ 1082 G_ELI_DEBUG(0, 1083 "Found no key files in loader.conf for %s.", 1084 pp->name); 1085 return (NULL); 1086 } 1087 1088 /* Ask for the passphrase if defined. */ 1089 if (md.md_iterations >= 0) { 1090 printf("Enter passphrase for %s: ", pp->name); 1091 cngets(passphrase, sizeof(passphrase), 1092 g_eli_visible_passphrase); 1093 } 1094 1095 /* 1096 * Prepare Derived-Key from the user passphrase. 1097 */ 1098 if (md.md_iterations == 0) { 1099 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1100 sizeof(md.md_salt)); 1101 g_eli_crypto_hmac_update(&ctx, passphrase, 1102 strlen(passphrase)); 1103 bzero(passphrase, sizeof(passphrase)); 1104 } else if (md.md_iterations > 0) { 1105 u_char dkey[G_ELI_USERKEYLEN]; 1106 1107 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1108 sizeof(md.md_salt), passphrase, md.md_iterations); 1109 bzero(passphrase, sizeof(passphrase)); 1110 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1111 bzero(dkey, sizeof(dkey)); 1112 } 1113 1114 g_eli_crypto_hmac_final(&ctx, key, 0); 1115 1116 /* 1117 * Decrypt Master-Key. 1118 */ 1119 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1120 bzero(key, sizeof(key)); 1121 if (error == -1) { 1122 if (i == tries - 1) { 1123 G_ELI_DEBUG(0, 1124 "Wrong key for %s. No tries left.", 1125 pp->name); 1126 g_eli_keyfiles_clear(pp->name); 1127 return (NULL); 1128 } 1129 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.", 1130 pp->name, tries - i - 1); 1131 /* Try again. */ 1132 continue; 1133 } else if (error > 0) { 1134 G_ELI_DEBUG(0, 1135 "Cannot decrypt Master Key for %s (error=%d).", 1136 pp->name, error); 1137 g_eli_keyfiles_clear(pp->name); 1138 return (NULL); 1139 } 1140 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1141 break; 1142 } 1143 1144 /* 1145 * We have correct key, let's attach provider. 1146 */ 1147 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1148 bzero(mkey, sizeof(mkey)); 1149 bzero(&md, sizeof(md)); 1150 if (gp == NULL) { 1151 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1152 G_ELI_SUFFIX); 1153 return (NULL); 1154 } 1155 return (gp); 1156 } 1157 1158 static void 1159 g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1160 struct g_consumer *cp, struct g_provider *pp) 1161 { 1162 struct g_eli_softc *sc; 1163 1164 g_topology_assert(); 1165 sc = gp->softc; 1166 if (sc == NULL) 1167 return; 1168 if (pp != NULL || cp != NULL) 1169 return; /* Nothing here. */ 1170 1171 sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>", indent, 1172 (uintmax_t)sc->sc_ekeys_total); 1173 sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>", indent, 1174 (uintmax_t)sc->sc_ekeys_allocated); 1175 sbuf_printf(sb, "%s<Flags>", indent); 1176 if (sc->sc_flags == 0) 1177 sbuf_printf(sb, "NONE"); 1178 else { 1179 int first = 1; 1180 1181 #define ADD_FLAG(flag, name) do { \ 1182 if (sc->sc_flags & (flag)) { \ 1183 if (!first) \ 1184 sbuf_printf(sb, ", "); \ 1185 else \ 1186 first = 0; \ 1187 sbuf_printf(sb, name); \ 1188 } \ 1189 } while (0) 1190 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND"); 1191 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY"); 1192 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1193 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1194 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1195 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1196 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1197 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1198 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1199 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1200 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1201 #undef ADD_FLAG 1202 } 1203 sbuf_printf(sb, "</Flags>\n"); 1204 1205 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1206 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1207 sc->sc_nkey); 1208 } 1209 sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version); 1210 sbuf_printf(sb, "%s<Crypto>", indent); 1211 switch (sc->sc_crypto) { 1212 case G_ELI_CRYPTO_HW: 1213 sbuf_printf(sb, "hardware"); 1214 break; 1215 case G_ELI_CRYPTO_SW: 1216 sbuf_printf(sb, "software"); 1217 break; 1218 default: 1219 sbuf_printf(sb, "UNKNOWN"); 1220 break; 1221 } 1222 sbuf_printf(sb, "</Crypto>\n"); 1223 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1224 sbuf_printf(sb, 1225 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1226 indent, g_eli_algo2str(sc->sc_aalgo)); 1227 } 1228 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1229 sc->sc_ekeylen); 1230 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", 1231 indent, g_eli_algo2str(sc->sc_ealgo)); 1232 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1233 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1234 } 1235 1236 static void 1237 g_eli_shutdown_pre_sync(void *arg, int howto) 1238 { 1239 struct g_class *mp; 1240 struct g_geom *gp, *gp2; 1241 struct g_provider *pp; 1242 struct g_eli_softc *sc; 1243 int error; 1244 1245 mp = arg; 1246 DROP_GIANT(); 1247 g_topology_lock(); 1248 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1249 sc = gp->softc; 1250 if (sc == NULL) 1251 continue; 1252 pp = LIST_FIRST(&gp->provider); 1253 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1254 if (pp->acr + pp->acw + pp->ace == 0) 1255 error = g_eli_destroy(sc, TRUE); 1256 else { 1257 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1258 gp->access = g_eli_access; 1259 } 1260 } 1261 g_topology_unlock(); 1262 PICKUP_GIANT(); 1263 } 1264 1265 static void 1266 g_eli_init(struct g_class *mp) 1267 { 1268 1269 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1270 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1271 if (g_eli_pre_sync == NULL) 1272 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1273 } 1274 1275 static void 1276 g_eli_fini(struct g_class *mp) 1277 { 1278 1279 if (g_eli_pre_sync != NULL) 1280 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1281 } 1282 1283 DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1284 MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1285