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/kernel.h> 33 #include <sys/linker.h> 34 #include <sys/module.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/bio.h> 38 #include <sys/sbuf.h> 39 #include <sys/sysctl.h> 40 #include <sys/malloc.h> 41 #include <sys/eventhandler.h> 42 #include <sys/kthread.h> 43 #include <sys/proc.h> 44 #include <sys/sched.h> 45 #include <sys/smp.h> 46 #include <sys/uio.h> 47 #include <sys/vnode.h> 48 49 #include <vm/uma.h> 50 51 #include <geom/geom.h> 52 #include <geom/eli/g_eli.h> 53 #include <geom/eli/pkcs5v2.h> 54 55 FEATURE(geom_eli, "GEOM crypto module"); 56 57 MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data"); 58 59 SYSCTL_DECL(_kern_geom); 60 SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff"); 61 static int g_eli_version = G_ELI_VERSION; 62 SYSCTL_INT(_kern_geom_eli, OID_AUTO, version, CTLFLAG_RD, &g_eli_version, 0, 63 "GELI version"); 64 int g_eli_debug = 0; 65 TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug); 66 SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0, 67 "Debug level"); 68 static u_int g_eli_tries = 3; 69 TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries); 70 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0, 71 "Number of tries for entering the passphrase"); 72 static u_int g_eli_visible_passphrase = GETS_NOECHO; 73 TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase); 74 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW, 75 &g_eli_visible_passphrase, 0, 76 "Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)"); 77 u_int g_eli_overwrites = G_ELI_OVERWRITES; 78 TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites); 79 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites, 80 0, "Number of times on-disk keys should be overwritten when destroying them"); 81 static u_int g_eli_threads = 0; 82 TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads); 83 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0, 84 "Number of threads doing crypto work"); 85 u_int g_eli_batch = 0; 86 TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch); 87 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0, 88 "Use crypto operations batching"); 89 90 static eventhandler_tag g_eli_pre_sync = NULL; 91 92 static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 93 struct g_geom *gp); 94 static void g_eli_init(struct g_class *mp); 95 static void g_eli_fini(struct g_class *mp); 96 97 static g_taste_t g_eli_taste; 98 static g_dumpconf_t g_eli_dumpconf; 99 100 struct g_class g_eli_class = { 101 .name = G_ELI_CLASS_NAME, 102 .version = G_VERSION, 103 .ctlreq = g_eli_config, 104 .taste = g_eli_taste, 105 .destroy_geom = g_eli_destroy_geom, 106 .init = g_eli_init, 107 .fini = g_eli_fini 108 }; 109 110 111 /* 112 * Code paths: 113 * BIO_READ: 114 * 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 115 * BIO_WRITE: 116 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 117 */ 118 119 120 /* 121 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto 122 * accelerator or something like this. 123 * The function updates the SID and rerun the operation. 124 */ 125 int 126 g_eli_crypto_rerun(struct cryptop *crp) 127 { 128 struct g_eli_softc *sc; 129 struct g_eli_worker *wr; 130 struct bio *bp; 131 int error; 132 133 bp = (struct bio *)crp->crp_opaque; 134 sc = bp->bio_to->geom->softc; 135 LIST_FOREACH(wr, &sc->sc_workers, w_next) { 136 if (wr->w_number == bp->bio_pflags) 137 break; 138 } 139 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags)); 140 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).", 141 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid, 142 (uintmax_t)crp->crp_sid); 143 wr->w_sid = crp->crp_sid; 144 crp->crp_etype = 0; 145 error = crypto_dispatch(crp); 146 if (error == 0) 147 return (0); 148 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error); 149 crp->crp_etype = error; 150 return (error); 151 } 152 153 /* 154 * The function is called afer reading encrypted data from the provider. 155 * 156 * 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 157 */ 158 void 159 g_eli_read_done(struct bio *bp) 160 { 161 struct g_eli_softc *sc; 162 struct bio *pbp; 163 164 G_ELI_LOGREQ(2, bp, "Request done."); 165 pbp = bp->bio_parent; 166 if (pbp->bio_error == 0) 167 pbp->bio_error = bp->bio_error; 168 g_destroy_bio(bp); 169 /* 170 * Do we have all sectors already? 171 */ 172 pbp->bio_inbed++; 173 if (pbp->bio_inbed < pbp->bio_children) 174 return; 175 sc = pbp->bio_to->geom->softc; 176 if (pbp->bio_error != 0) { 177 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__); 178 pbp->bio_completed = 0; 179 if (pbp->bio_driver2 != NULL) { 180 free(pbp->bio_driver2, M_ELI); 181 pbp->bio_driver2 = NULL; 182 } 183 g_io_deliver(pbp, pbp->bio_error); 184 atomic_subtract_int(&sc->sc_inflight, 1); 185 return; 186 } 187 mtx_lock(&sc->sc_queue_mtx); 188 bioq_insert_tail(&sc->sc_queue, pbp); 189 mtx_unlock(&sc->sc_queue_mtx); 190 wakeup(sc); 191 } 192 193 /* 194 * The function is called after we encrypt and write data. 195 * 196 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver 197 */ 198 void 199 g_eli_write_done(struct bio *bp) 200 { 201 struct g_eli_softc *sc; 202 struct bio *pbp; 203 204 G_ELI_LOGREQ(2, bp, "Request done."); 205 pbp = bp->bio_parent; 206 if (pbp->bio_error == 0) { 207 if (bp->bio_error != 0) 208 pbp->bio_error = bp->bio_error; 209 } 210 g_destroy_bio(bp); 211 /* 212 * Do we have all sectors already? 213 */ 214 pbp->bio_inbed++; 215 if (pbp->bio_inbed < pbp->bio_children) 216 return; 217 free(pbp->bio_driver2, M_ELI); 218 pbp->bio_driver2 = NULL; 219 if (pbp->bio_error != 0) { 220 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).", 221 pbp->bio_error); 222 pbp->bio_completed = 0; 223 } 224 /* 225 * Write is finished, send it up. 226 */ 227 pbp->bio_completed = pbp->bio_length; 228 sc = pbp->bio_to->geom->softc; 229 g_io_deliver(pbp, pbp->bio_error); 230 atomic_subtract_int(&sc->sc_inflight, 1); 231 } 232 233 /* 234 * This function should never be called, but GEOM made as it set ->orphan() 235 * method for every geom. 236 */ 237 static void 238 g_eli_orphan_spoil_assert(struct g_consumer *cp) 239 { 240 241 panic("Function %s() called for %s.", __func__, cp->geom->name); 242 } 243 244 static void 245 g_eli_orphan(struct g_consumer *cp) 246 { 247 struct g_eli_softc *sc; 248 249 g_topology_assert(); 250 sc = cp->geom->softc; 251 if (sc == NULL) 252 return; 253 g_eli_destroy(sc, TRUE); 254 } 255 256 /* 257 * BIO_READ: 258 * 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 259 * BIO_WRITE: 260 * G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 261 */ 262 static void 263 g_eli_start(struct bio *bp) 264 { 265 struct g_eli_softc *sc; 266 struct g_consumer *cp; 267 struct bio *cbp; 268 269 sc = bp->bio_to->geom->softc; 270 KASSERT(sc != NULL, 271 ("Provider's error should be set (error=%d)(device=%s).", 272 bp->bio_to->error, bp->bio_to->name)); 273 G_ELI_LOGREQ(2, bp, "Request received."); 274 275 switch (bp->bio_cmd) { 276 case BIO_READ: 277 case BIO_WRITE: 278 case BIO_GETATTR: 279 case BIO_FLUSH: 280 break; 281 case BIO_DELETE: 282 /* 283 * We could eventually support BIO_DELETE request. 284 * It could be done by overwritting requested sector with 285 * random data g_eli_overwrites number of times. 286 */ 287 default: 288 g_io_deliver(bp, EOPNOTSUPP); 289 return; 290 } 291 cbp = g_clone_bio(bp); 292 if (cbp == NULL) { 293 g_io_deliver(bp, ENOMEM); 294 return; 295 } 296 bp->bio_driver1 = cbp; 297 bp->bio_pflags = G_ELI_NEW_BIO; 298 switch (bp->bio_cmd) { 299 case BIO_READ: 300 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) { 301 g_eli_crypto_read(sc, bp, 0); 302 break; 303 } 304 /* FALLTHROUGH */ 305 case BIO_WRITE: 306 mtx_lock(&sc->sc_queue_mtx); 307 bioq_insert_tail(&sc->sc_queue, bp); 308 mtx_unlock(&sc->sc_queue_mtx); 309 wakeup(sc); 310 break; 311 case BIO_GETATTR: 312 case BIO_FLUSH: 313 cbp->bio_done = g_std_done; 314 cp = LIST_FIRST(&sc->sc_geom->consumer); 315 cbp->bio_to = cp->provider; 316 G_ELI_LOGREQ(2, cbp, "Sending request."); 317 g_io_request(cbp, cp); 318 break; 319 } 320 } 321 322 static int 323 g_eli_newsession(struct g_eli_worker *wr) 324 { 325 struct g_eli_softc *sc; 326 struct cryptoini crie, cria; 327 int error; 328 329 sc = wr->w_softc; 330 331 bzero(&crie, sizeof(crie)); 332 crie.cri_alg = sc->sc_ealgo; 333 crie.cri_klen = sc->sc_ekeylen; 334 if (sc->sc_ealgo == CRYPTO_AES_XTS) 335 crie.cri_klen <<= 1; 336 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) { 337 crie.cri_key = g_eli_key_hold(sc, 0, 338 LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize); 339 } else { 340 crie.cri_key = sc->sc_ekey; 341 } 342 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 343 bzero(&cria, sizeof(cria)); 344 cria.cri_alg = sc->sc_aalgo; 345 cria.cri_klen = sc->sc_akeylen; 346 cria.cri_key = sc->sc_akey; 347 crie.cri_next = &cria; 348 } 349 350 switch (sc->sc_crypto) { 351 case G_ELI_CRYPTO_SW: 352 error = crypto_newsession(&wr->w_sid, &crie, 353 CRYPTOCAP_F_SOFTWARE); 354 break; 355 case G_ELI_CRYPTO_HW: 356 error = crypto_newsession(&wr->w_sid, &crie, 357 CRYPTOCAP_F_HARDWARE); 358 break; 359 case G_ELI_CRYPTO_UNKNOWN: 360 error = crypto_newsession(&wr->w_sid, &crie, 361 CRYPTOCAP_F_HARDWARE); 362 if (error == 0) { 363 mtx_lock(&sc->sc_queue_mtx); 364 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 365 sc->sc_crypto = G_ELI_CRYPTO_HW; 366 mtx_unlock(&sc->sc_queue_mtx); 367 } else { 368 error = crypto_newsession(&wr->w_sid, &crie, 369 CRYPTOCAP_F_SOFTWARE); 370 mtx_lock(&sc->sc_queue_mtx); 371 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 372 sc->sc_crypto = G_ELI_CRYPTO_SW; 373 mtx_unlock(&sc->sc_queue_mtx); 374 } 375 break; 376 default: 377 panic("%s: invalid condition", __func__); 378 } 379 380 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) 381 g_eli_key_drop(sc, crie.cri_key); 382 383 return (error); 384 } 385 386 static void 387 g_eli_freesession(struct g_eli_worker *wr) 388 { 389 390 crypto_freesession(wr->w_sid); 391 } 392 393 static void 394 g_eli_cancel(struct g_eli_softc *sc) 395 { 396 struct bio *bp; 397 398 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 399 400 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 401 KASSERT(bp->bio_pflags == G_ELI_NEW_BIO, 402 ("Not new bio when canceling (bp=%p).", bp)); 403 g_io_deliver(bp, ENXIO); 404 } 405 } 406 407 static struct bio * 408 g_eli_takefirst(struct g_eli_softc *sc) 409 { 410 struct bio *bp; 411 412 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 413 414 if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND)) 415 return (bioq_takefirst(&sc->sc_queue)); 416 /* 417 * Device suspended, so we skip new I/O requests. 418 */ 419 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 420 if (bp->bio_pflags != G_ELI_NEW_BIO) 421 break; 422 } 423 if (bp != NULL) 424 bioq_remove(&sc->sc_queue, bp); 425 return (bp); 426 } 427 428 /* 429 * This is the main function for kernel worker thread when we don't have 430 * hardware acceleration and we have to do cryptography in software. 431 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM 432 * threads with crypto work. 433 */ 434 static void 435 g_eli_worker(void *arg) 436 { 437 struct g_eli_softc *sc; 438 struct g_eli_worker *wr; 439 struct bio *bp; 440 int error; 441 442 wr = arg; 443 sc = wr->w_softc; 444 #ifdef SMP 445 /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */ 446 if (mp_ncpus > 1 && sc->sc_crypto == G_ELI_CRYPTO_SW && 447 g_eli_threads == 0) { 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_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0) 455 sched_bind(curthread, wr->w_number); 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", 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 */ 539 void 540 g_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 } 569 570 int 571 g_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); 605 end: 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 */ 622 static void 623 g_eli_last_close(struct g_eli_softc *sc) 624 { 625 struct g_geom *gp; 626 struct g_provider *pp; 627 char ppname[64]; 628 int error; 629 630 g_topology_assert(); 631 gp = sc->sc_geom; 632 pp = LIST_FIRST(&gp->provider); 633 strlcpy(ppname, pp->name, sizeof(ppname)); 634 error = g_eli_destroy(sc, TRUE); 635 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 636 ppname, error)); 637 G_ELI_DEBUG(0, "Detached %s on last close.", ppname); 638 } 639 640 int 641 g_eli_access(struct g_provider *pp, int dr, int dw, int de) 642 { 643 struct g_eli_softc *sc; 644 struct g_geom *gp; 645 646 gp = pp->geom; 647 sc = gp->softc; 648 649 if (dw > 0) { 650 if (sc->sc_flags & G_ELI_FLAG_RO) { 651 /* Deny write attempts. */ 652 return (EROFS); 653 } 654 /* Someone is opening us for write, we need to remember that. */ 655 sc->sc_flags |= G_ELI_FLAG_WOPEN; 656 return (0); 657 } 658 /* Is this the last close? */ 659 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 660 return (0); 661 662 /* 663 * Automatically detach on last close if requested. 664 */ 665 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 666 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 667 g_eli_last_close(sc); 668 } 669 return (0); 670 } 671 672 static int 673 g_eli_cpu_is_disabled(int cpu) 674 { 675 #ifdef SMP 676 return (CPU_ISSET(cpu, &hlt_cpus_mask)); 677 #else 678 return (0); 679 #endif 680 } 681 682 struct g_geom * 683 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 684 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 685 { 686 struct g_eli_softc *sc; 687 struct g_eli_worker *wr; 688 struct g_geom *gp; 689 struct g_provider *pp; 690 struct g_consumer *cp; 691 u_int i, threads; 692 int error; 693 694 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 695 696 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 697 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 698 gp->start = g_eli_start; 699 /* 700 * Spoiling cannot happen actually, because we keep provider open for 701 * writing all the time or provider is read-only. 702 */ 703 gp->spoiled = g_eli_orphan_spoil_assert; 704 gp->orphan = g_eli_orphan; 705 gp->dumpconf = g_eli_dumpconf; 706 /* 707 * If detach-on-last-close feature is not enabled and we don't operate 708 * on read-only provider, we can simply use g_std_access(). 709 */ 710 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 711 gp->access = g_eli_access; 712 else 713 gp->access = g_std_access; 714 715 sc->sc_inflight = 0; 716 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 717 sc->sc_flags = md->md_flags; 718 /* Backward compatibility. */ 719 if (md->md_version < 4) 720 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 721 if (md->md_version < 5) 722 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 723 if (md->md_version < 6 && (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) 724 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 725 sc->sc_ealgo = md->md_ealgo; 726 sc->sc_nkey = nkey; 727 728 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 729 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 730 sc->sc_aalgo = md->md_aalgo; 731 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 732 733 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 734 /* 735 * Some hash functions (like SHA1 and RIPEMD160) generates hash 736 * which length is not multiple of 128 bits, but we want data 737 * length to be multiple of 128, so we can encrypt without 738 * padding. The line below rounds down data length to multiple 739 * of 128 bits. 740 */ 741 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 742 743 sc->sc_bytes_per_sector = 744 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 745 sc->sc_bytes_per_sector *= bpp->sectorsize; 746 } 747 748 gp->softc = sc; 749 sc->sc_geom = gp; 750 751 bioq_init(&sc->sc_queue); 752 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 753 mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF); 754 755 pp = NULL; 756 cp = g_new_consumer(gp); 757 error = g_attach(cp, bpp); 758 if (error != 0) { 759 if (req != NULL) { 760 gctl_error(req, "Cannot attach to %s (error=%d).", 761 bpp->name, error); 762 } else { 763 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 764 bpp->name, error); 765 } 766 goto failed; 767 } 768 /* 769 * Keep provider open all the time, so we can run critical tasks, 770 * like Master Keys deletion, without wondering if we can open 771 * provider or not. 772 * We don't open provider for writing only when user requested read-only 773 * access. 774 */ 775 if (sc->sc_flags & G_ELI_FLAG_RO) 776 error = g_access(cp, 1, 0, 1); 777 else 778 error = g_access(cp, 1, 1, 1); 779 if (error != 0) { 780 if (req != NULL) { 781 gctl_error(req, "Cannot access %s (error=%d).", 782 bpp->name, error); 783 } else { 784 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 785 bpp->name, error); 786 } 787 goto failed; 788 } 789 790 sc->sc_sectorsize = md->md_sectorsize; 791 sc->sc_mediasize = bpp->mediasize; 792 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 793 sc->sc_mediasize -= bpp->sectorsize; 794 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 795 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 796 else { 797 sc->sc_mediasize /= sc->sc_bytes_per_sector; 798 sc->sc_mediasize *= sc->sc_sectorsize; 799 } 800 801 /* 802 * Remember the keys in our softc structure. 803 */ 804 g_eli_mkey_propagate(sc, mkey); 805 sc->sc_ekeylen = md->md_keylen; 806 807 LIST_INIT(&sc->sc_workers); 808 809 threads = g_eli_threads; 810 if (threads == 0) 811 threads = mp_ncpus; 812 else if (threads > mp_ncpus) { 813 /* There is really no need for too many worker threads. */ 814 threads = mp_ncpus; 815 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads); 816 } 817 for (i = 0; i < threads; i++) { 818 if (g_eli_cpu_is_disabled(i)) { 819 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 820 bpp->name, i); 821 continue; 822 } 823 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 824 wr->w_softc = sc; 825 wr->w_number = i; 826 wr->w_active = TRUE; 827 828 error = g_eli_newsession(wr); 829 if (error != 0) { 830 free(wr, M_ELI); 831 if (req != NULL) { 832 gctl_error(req, "Cannot set up crypto session " 833 "for %s (error=%d).", bpp->name, error); 834 } else { 835 G_ELI_DEBUG(1, "Cannot set up crypto session " 836 "for %s (error=%d).", bpp->name, error); 837 } 838 goto failed; 839 } 840 841 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 842 "g_eli[%u] %s", i, bpp->name); 843 if (error != 0) { 844 g_eli_freesession(wr); 845 free(wr, M_ELI); 846 if (req != NULL) { 847 gctl_error(req, "Cannot create kernel thread " 848 "for %s (error=%d).", bpp->name, error); 849 } else { 850 G_ELI_DEBUG(1, "Cannot create kernel thread " 851 "for %s (error=%d).", bpp->name, error); 852 } 853 goto failed; 854 } 855 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 856 /* If we have hardware support, one thread is enough. */ 857 if (sc->sc_crypto == G_ELI_CRYPTO_HW) 858 break; 859 } 860 861 /* 862 * Create decrypted provider. 863 */ 864 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 865 pp->mediasize = sc->sc_mediasize; 866 pp->sectorsize = sc->sc_sectorsize; 867 868 g_error_provider(pp, 0); 869 870 G_ELI_DEBUG(0, "Device %s created.", pp->name); 871 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 872 sc->sc_ekeylen); 873 if (sc->sc_flags & G_ELI_FLAG_AUTH) 874 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 875 G_ELI_DEBUG(0, " Crypto: %s", 876 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 877 return (gp); 878 failed: 879 mtx_lock(&sc->sc_queue_mtx); 880 sc->sc_flags |= G_ELI_FLAG_DESTROY; 881 wakeup(sc); 882 /* 883 * Wait for kernel threads self destruction. 884 */ 885 while (!LIST_EMPTY(&sc->sc_workers)) { 886 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 887 "geli:destroy", 0); 888 } 889 mtx_destroy(&sc->sc_queue_mtx); 890 if (cp->provider != NULL) { 891 if (cp->acr == 1) 892 g_access(cp, -1, -1, -1); 893 g_detach(cp); 894 } 895 g_destroy_consumer(cp); 896 g_destroy_geom(gp); 897 g_eli_key_destroy(sc); 898 bzero(sc, sizeof(*sc)); 899 free(sc, M_ELI); 900 return (NULL); 901 } 902 903 int 904 g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 905 { 906 struct g_geom *gp; 907 struct g_provider *pp; 908 909 g_topology_assert(); 910 911 if (sc == NULL) 912 return (ENXIO); 913 914 gp = sc->sc_geom; 915 pp = LIST_FIRST(&gp->provider); 916 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 917 if (force) { 918 G_ELI_DEBUG(1, "Device %s is still open, so it " 919 "cannot be definitely removed.", pp->name); 920 } else { 921 G_ELI_DEBUG(1, 922 "Device %s is still open (r%dw%de%d).", pp->name, 923 pp->acr, pp->acw, pp->ace); 924 return (EBUSY); 925 } 926 } 927 928 mtx_lock(&sc->sc_queue_mtx); 929 sc->sc_flags |= G_ELI_FLAG_DESTROY; 930 wakeup(sc); 931 while (!LIST_EMPTY(&sc->sc_workers)) { 932 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 933 "geli:destroy", 0); 934 } 935 mtx_destroy(&sc->sc_queue_mtx); 936 gp->softc = NULL; 937 g_eli_key_destroy(sc); 938 bzero(sc, sizeof(*sc)); 939 free(sc, M_ELI); 940 941 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 942 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 943 g_wither_geom_close(gp, ENXIO); 944 945 return (0); 946 } 947 948 static int 949 g_eli_destroy_geom(struct gctl_req *req __unused, 950 struct g_class *mp __unused, struct g_geom *gp) 951 { 952 struct g_eli_softc *sc; 953 954 sc = gp->softc; 955 return (g_eli_destroy(sc, FALSE)); 956 } 957 958 static int 959 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 960 { 961 u_char *keyfile, *data; 962 char *file, name[64]; 963 size_t size; 964 int i; 965 966 for (i = 0; ; i++) { 967 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 968 keyfile = preload_search_by_type(name); 969 if (keyfile == NULL) 970 return (i); /* Return number of loaded keyfiles. */ 971 data = preload_fetch_addr(keyfile); 972 if (data == NULL) { 973 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 974 name); 975 return (0); 976 } 977 size = preload_fetch_size(keyfile); 978 if (size == 0) { 979 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 980 name); 981 return (0); 982 } 983 file = preload_search_info(keyfile, MODINFO_NAME); 984 if (file == NULL) { 985 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 986 name); 987 return (0); 988 } 989 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 990 provider, name); 991 g_eli_crypto_hmac_update(ctx, data, size); 992 } 993 } 994 995 static void 996 g_eli_keyfiles_clear(const char *provider) 997 { 998 u_char *keyfile, *data; 999 char name[64]; 1000 size_t size; 1001 int i; 1002 1003 for (i = 0; ; i++) { 1004 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1005 keyfile = preload_search_by_type(name); 1006 if (keyfile == NULL) 1007 return; 1008 data = preload_fetch_addr(keyfile); 1009 size = preload_fetch_size(keyfile); 1010 if (data != NULL && size != 0) 1011 bzero(data, size); 1012 } 1013 } 1014 1015 /* 1016 * Tasting is only made on boot. 1017 * We detect providers which should be attached before root is mounted. 1018 */ 1019 static struct g_geom * 1020 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 1021 { 1022 struct g_eli_metadata md; 1023 struct g_geom *gp; 1024 struct hmac_ctx ctx; 1025 char passphrase[256]; 1026 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 1027 u_int i, nkey, nkeyfiles, tries; 1028 int error; 1029 1030 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1031 g_topology_assert(); 1032 1033 if (root_mounted() || g_eli_tries == 0) 1034 return (NULL); 1035 1036 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1037 1038 error = g_eli_read_metadata(mp, pp, &md); 1039 if (error != 0) 1040 return (NULL); 1041 gp = NULL; 1042 1043 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1044 return (NULL); 1045 if (md.md_version > G_ELI_VERSION) { 1046 printf("geom_eli.ko module is too old to handle %s.\n", 1047 pp->name); 1048 return (NULL); 1049 } 1050 if (md.md_provsize != pp->mediasize) 1051 return (NULL); 1052 /* Should we attach it on boot? */ 1053 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1054 return (NULL); 1055 if (md.md_keys == 0x00) { 1056 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1057 return (NULL); 1058 } 1059 if (md.md_iterations == -1) { 1060 /* If there is no passphrase, we try only once. */ 1061 tries = 1; 1062 } else { 1063 /* Ask for the passphrase no more than g_eli_tries times. */ 1064 tries = g_eli_tries; 1065 } 1066 1067 for (i = 0; i < tries; i++) { 1068 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1069 1070 /* 1071 * Load all key files. 1072 */ 1073 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1074 1075 if (nkeyfiles == 0 && md.md_iterations == -1) { 1076 /* 1077 * No key files and no passphrase, something is 1078 * definitely wrong here. 1079 * geli(8) doesn't allow for such situation, so assume 1080 * that there was really no passphrase and in that case 1081 * key files are no properly defined in loader.conf. 1082 */ 1083 G_ELI_DEBUG(0, 1084 "Found no key files in loader.conf for %s.", 1085 pp->name); 1086 return (NULL); 1087 } 1088 1089 /* Ask for the passphrase if defined. */ 1090 if (md.md_iterations >= 0) { 1091 printf("Enter passphrase for %s: ", pp->name); 1092 gets(passphrase, sizeof(passphrase), 1093 g_eli_visible_passphrase); 1094 } 1095 1096 /* 1097 * Prepare Derived-Key from the user passphrase. 1098 */ 1099 if (md.md_iterations == 0) { 1100 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1101 sizeof(md.md_salt)); 1102 g_eli_crypto_hmac_update(&ctx, passphrase, 1103 strlen(passphrase)); 1104 bzero(passphrase, sizeof(passphrase)); 1105 } else if (md.md_iterations > 0) { 1106 u_char dkey[G_ELI_USERKEYLEN]; 1107 1108 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1109 sizeof(md.md_salt), passphrase, md.md_iterations); 1110 bzero(passphrase, sizeof(passphrase)); 1111 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1112 bzero(dkey, sizeof(dkey)); 1113 } 1114 1115 g_eli_crypto_hmac_final(&ctx, key, 0); 1116 1117 /* 1118 * Decrypt Master-Key. 1119 */ 1120 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1121 bzero(key, sizeof(key)); 1122 if (error == -1) { 1123 if (i == tries - 1) { 1124 G_ELI_DEBUG(0, 1125 "Wrong key for %s. No tries left.", 1126 pp->name); 1127 g_eli_keyfiles_clear(pp->name); 1128 return (NULL); 1129 } 1130 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.", 1131 pp->name, tries - i - 1); 1132 /* Try again. */ 1133 continue; 1134 } else if (error > 0) { 1135 G_ELI_DEBUG(0, "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<Crypto>", indent); 1210 switch (sc->sc_crypto) { 1211 case G_ELI_CRYPTO_HW: 1212 sbuf_printf(sb, "hardware"); 1213 break; 1214 case G_ELI_CRYPTO_SW: 1215 sbuf_printf(sb, "software"); 1216 break; 1217 default: 1218 sbuf_printf(sb, "UNKNOWN"); 1219 break; 1220 } 1221 sbuf_printf(sb, "</Crypto>\n"); 1222 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1223 sbuf_printf(sb, 1224 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1225 indent, g_eli_algo2str(sc->sc_aalgo)); 1226 } 1227 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1228 sc->sc_ekeylen); 1229 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent, 1230 g_eli_algo2str(sc->sc_ealgo)); 1231 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1232 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1233 } 1234 1235 static void 1236 g_eli_shutdown_pre_sync(void *arg, int howto) 1237 { 1238 struct g_class *mp; 1239 struct g_geom *gp, *gp2; 1240 struct g_provider *pp; 1241 struct g_eli_softc *sc; 1242 int error; 1243 1244 mp = arg; 1245 DROP_GIANT(); 1246 g_topology_lock(); 1247 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1248 sc = gp->softc; 1249 if (sc == NULL) 1250 continue; 1251 pp = LIST_FIRST(&gp->provider); 1252 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1253 if (pp->acr + pp->acw + pp->ace == 0) 1254 error = g_eli_destroy(sc, TRUE); 1255 else { 1256 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1257 gp->access = g_eli_access; 1258 } 1259 } 1260 g_topology_unlock(); 1261 PICKUP_GIANT(); 1262 } 1263 1264 static void 1265 g_eli_init(struct g_class *mp) 1266 { 1267 1268 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1269 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1270 if (g_eli_pre_sync == NULL) 1271 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1272 } 1273 1274 static void 1275 g_eli_fini(struct g_class *mp) 1276 { 1277 1278 if (g_eli_pre_sync != NULL) 1279 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1280 } 1281 1282 DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1283 MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1284