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(void *arg, int flags __unused) 625 { 626 struct g_geom *gp; 627 char gpname[64]; 628 int error; 629 630 g_topology_assert(); 631 gp = arg; 632 strlcpy(gpname, gp->name, sizeof(gpname)); 633 error = g_eli_destroy(gp->softc, TRUE); 634 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 635 gpname, error)); 636 G_ELI_DEBUG(0, "Detached %s on last close.", gpname); 637 } 638 639 int 640 g_eli_access(struct g_provider *pp, int dr, int dw, int de) 641 { 642 struct g_eli_softc *sc; 643 struct g_geom *gp; 644 645 gp = pp->geom; 646 sc = gp->softc; 647 648 if (dw > 0) { 649 if (sc->sc_flags & G_ELI_FLAG_RO) { 650 /* Deny write attempts. */ 651 return (EROFS); 652 } 653 /* Someone is opening us for write, we need to remember that. */ 654 sc->sc_flags |= G_ELI_FLAG_WOPEN; 655 return (0); 656 } 657 /* Is this the last close? */ 658 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 659 return (0); 660 661 /* 662 * Automatically detach on last close if requested. 663 */ 664 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 665 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 666 g_post_event(g_eli_last_close, gp, M_WAITOK, NULL); 667 } 668 return (0); 669 } 670 671 static int 672 g_eli_cpu_is_disabled(int cpu) 673 { 674 #ifdef SMP 675 return (CPU_ISSET(cpu, &hlt_cpus_mask)); 676 #else 677 return (0); 678 #endif 679 } 680 681 struct g_geom * 682 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 683 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 684 { 685 struct g_eli_softc *sc; 686 struct g_eli_worker *wr; 687 struct g_geom *gp; 688 struct g_provider *pp; 689 struct g_consumer *cp; 690 u_int i, threads; 691 int error; 692 693 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 694 695 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 696 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 697 gp->start = g_eli_start; 698 /* 699 * Spoiling cannot happen actually, because we keep provider open for 700 * writing all the time or provider is read-only. 701 */ 702 gp->spoiled = g_eli_orphan_spoil_assert; 703 gp->orphan = g_eli_orphan; 704 gp->dumpconf = g_eli_dumpconf; 705 /* 706 * If detach-on-last-close feature is not enabled and we don't operate 707 * on read-only provider, we can simply use g_std_access(). 708 */ 709 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 710 gp->access = g_eli_access; 711 else 712 gp->access = g_std_access; 713 714 sc->sc_version = md->md_version; 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 < G_ELI_VERSION_04) 720 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 721 if (md->md_version < G_ELI_VERSION_05) 722 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 723 if (md->md_version < G_ELI_VERSION_06 && 724 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 725 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 726 } 727 if (md->md_version < G_ELI_VERSION_07) 728 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 729 sc->sc_ealgo = md->md_ealgo; 730 sc->sc_nkey = nkey; 731 732 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 733 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 734 sc->sc_aalgo = md->md_aalgo; 735 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 736 737 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 738 /* 739 * Some hash functions (like SHA1 and RIPEMD160) generates hash 740 * which length is not multiple of 128 bits, but we want data 741 * length to be multiple of 128, so we can encrypt without 742 * padding. The line below rounds down data length to multiple 743 * of 128 bits. 744 */ 745 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 746 747 sc->sc_bytes_per_sector = 748 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 749 sc->sc_bytes_per_sector *= bpp->sectorsize; 750 } 751 752 gp->softc = sc; 753 sc->sc_geom = gp; 754 755 bioq_init(&sc->sc_queue); 756 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 757 mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF); 758 759 pp = NULL; 760 cp = g_new_consumer(gp); 761 error = g_attach(cp, bpp); 762 if (error != 0) { 763 if (req != NULL) { 764 gctl_error(req, "Cannot attach to %s (error=%d).", 765 bpp->name, error); 766 } else { 767 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 768 bpp->name, error); 769 } 770 goto failed; 771 } 772 /* 773 * Keep provider open all the time, so we can run critical tasks, 774 * like Master Keys deletion, without wondering if we can open 775 * provider or not. 776 * We don't open provider for writing only when user requested read-only 777 * access. 778 */ 779 if (sc->sc_flags & G_ELI_FLAG_RO) 780 error = g_access(cp, 1, 0, 1); 781 else 782 error = g_access(cp, 1, 1, 1); 783 if (error != 0) { 784 if (req != NULL) { 785 gctl_error(req, "Cannot access %s (error=%d).", 786 bpp->name, error); 787 } else { 788 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 789 bpp->name, error); 790 } 791 goto failed; 792 } 793 794 sc->sc_sectorsize = md->md_sectorsize; 795 sc->sc_mediasize = bpp->mediasize; 796 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 797 sc->sc_mediasize -= bpp->sectorsize; 798 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 799 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 800 else { 801 sc->sc_mediasize /= sc->sc_bytes_per_sector; 802 sc->sc_mediasize *= sc->sc_sectorsize; 803 } 804 805 /* 806 * Remember the keys in our softc structure. 807 */ 808 g_eli_mkey_propagate(sc, mkey); 809 sc->sc_ekeylen = md->md_keylen; 810 811 LIST_INIT(&sc->sc_workers); 812 813 threads = g_eli_threads; 814 if (threads == 0) 815 threads = mp_ncpus; 816 sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus); 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 } 857 858 /* 859 * Create decrypted provider. 860 */ 861 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 862 pp->mediasize = sc->sc_mediasize; 863 pp->sectorsize = sc->sc_sectorsize; 864 865 g_error_provider(pp, 0); 866 867 G_ELI_DEBUG(0, "Device %s created.", pp->name); 868 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 869 sc->sc_ekeylen); 870 if (sc->sc_flags & G_ELI_FLAG_AUTH) 871 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 872 G_ELI_DEBUG(0, " Crypto: %s", 873 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 874 return (gp); 875 failed: 876 mtx_lock(&sc->sc_queue_mtx); 877 sc->sc_flags |= G_ELI_FLAG_DESTROY; 878 wakeup(sc); 879 /* 880 * Wait for kernel threads self destruction. 881 */ 882 while (!LIST_EMPTY(&sc->sc_workers)) { 883 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 884 "geli:destroy", 0); 885 } 886 mtx_destroy(&sc->sc_queue_mtx); 887 if (cp->provider != NULL) { 888 if (cp->acr == 1) 889 g_access(cp, -1, -1, -1); 890 g_detach(cp); 891 } 892 g_destroy_consumer(cp); 893 g_destroy_geom(gp); 894 g_eli_key_destroy(sc); 895 bzero(sc, sizeof(*sc)); 896 free(sc, M_ELI); 897 return (NULL); 898 } 899 900 int 901 g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 902 { 903 struct g_geom *gp; 904 struct g_provider *pp; 905 906 g_topology_assert(); 907 908 if (sc == NULL) 909 return (ENXIO); 910 911 gp = sc->sc_geom; 912 pp = LIST_FIRST(&gp->provider); 913 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 914 if (force) { 915 G_ELI_DEBUG(1, "Device %s is still open, so it " 916 "cannot be definitely removed.", pp->name); 917 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 918 gp->access = g_eli_access; 919 g_wither_provider(pp, ENXIO); 920 return (EBUSY); 921 } else { 922 G_ELI_DEBUG(1, 923 "Device %s is still open (r%dw%de%d).", pp->name, 924 pp->acr, pp->acw, pp->ace); 925 return (EBUSY); 926 } 927 } 928 929 mtx_lock(&sc->sc_queue_mtx); 930 sc->sc_flags |= G_ELI_FLAG_DESTROY; 931 wakeup(sc); 932 while (!LIST_EMPTY(&sc->sc_workers)) { 933 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 934 "geli:destroy", 0); 935 } 936 mtx_destroy(&sc->sc_queue_mtx); 937 gp->softc = NULL; 938 g_eli_key_destroy(sc); 939 bzero(sc, sizeof(*sc)); 940 free(sc, M_ELI); 941 942 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 943 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 944 g_wither_geom_close(gp, ENXIO); 945 946 return (0); 947 } 948 949 static int 950 g_eli_destroy_geom(struct gctl_req *req __unused, 951 struct g_class *mp __unused, struct g_geom *gp) 952 { 953 struct g_eli_softc *sc; 954 955 sc = gp->softc; 956 return (g_eli_destroy(sc, FALSE)); 957 } 958 959 static int 960 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 961 { 962 u_char *keyfile, *data; 963 char *file, name[64]; 964 size_t size; 965 int i; 966 967 for (i = 0; ; i++) { 968 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 969 keyfile = preload_search_by_type(name); 970 if (keyfile == NULL) 971 return (i); /* Return number of loaded keyfiles. */ 972 data = preload_fetch_addr(keyfile); 973 if (data == NULL) { 974 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 975 name); 976 return (0); 977 } 978 size = preload_fetch_size(keyfile); 979 if (size == 0) { 980 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 981 name); 982 return (0); 983 } 984 file = preload_search_info(keyfile, MODINFO_NAME); 985 if (file == NULL) { 986 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 987 name); 988 return (0); 989 } 990 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 991 provider, name); 992 g_eli_crypto_hmac_update(ctx, data, size); 993 bzero(data, size); 994 } 995 } 996 997 static void 998 g_eli_keyfiles_clear(const char *provider) 999 { 1000 u_char *keyfile, *data; 1001 char name[64]; 1002 size_t size; 1003 int i; 1004 1005 for (i = 0; ; i++) { 1006 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1007 keyfile = preload_search_by_type(name); 1008 if (keyfile == NULL) 1009 return; 1010 data = preload_fetch_addr(keyfile); 1011 size = preload_fetch_size(keyfile); 1012 if (data != NULL && size != 0) 1013 bzero(data, size); 1014 } 1015 } 1016 1017 /* 1018 * Tasting is only made on boot. 1019 * We detect providers which should be attached before root is mounted. 1020 */ 1021 static struct g_geom * 1022 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 1023 { 1024 struct g_eli_metadata md; 1025 struct g_geom *gp; 1026 struct hmac_ctx ctx; 1027 char passphrase[256]; 1028 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 1029 u_int i, nkey, nkeyfiles, tries; 1030 int error; 1031 1032 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1033 g_topology_assert(); 1034 1035 if (root_mounted() || g_eli_tries == 0) 1036 return (NULL); 1037 1038 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1039 1040 error = g_eli_read_metadata(mp, pp, &md); 1041 if (error != 0) 1042 return (NULL); 1043 gp = NULL; 1044 1045 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1046 return (NULL); 1047 if (md.md_version > G_ELI_VERSION) { 1048 printf("geom_eli.ko module is too old to handle %s.\n", 1049 pp->name); 1050 return (NULL); 1051 } 1052 if (md.md_provsize != pp->mediasize) 1053 return (NULL); 1054 /* Should we attach it on boot? */ 1055 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1056 return (NULL); 1057 if (md.md_keys == 0x00) { 1058 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1059 return (NULL); 1060 } 1061 if (md.md_iterations == -1) { 1062 /* If there is no passphrase, we try only once. */ 1063 tries = 1; 1064 } else { 1065 /* Ask for the passphrase no more than g_eli_tries times. */ 1066 tries = g_eli_tries; 1067 } 1068 1069 for (i = 0; i < tries; i++) { 1070 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1071 1072 /* 1073 * Load all key files. 1074 */ 1075 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1076 1077 if (nkeyfiles == 0 && md.md_iterations == -1) { 1078 /* 1079 * No key files and no passphrase, something is 1080 * definitely wrong here. 1081 * geli(8) doesn't allow for such situation, so assume 1082 * that there was really no passphrase and in that case 1083 * key files are no properly defined in loader.conf. 1084 */ 1085 G_ELI_DEBUG(0, 1086 "Found no key files in loader.conf for %s.", 1087 pp->name); 1088 return (NULL); 1089 } 1090 1091 /* Ask for the passphrase if defined. */ 1092 if (md.md_iterations >= 0) { 1093 printf("Enter passphrase for %s: ", pp->name); 1094 cngets(passphrase, sizeof(passphrase), 1095 g_eli_visible_passphrase); 1096 } 1097 1098 /* 1099 * Prepare Derived-Key from the user passphrase. 1100 */ 1101 if (md.md_iterations == 0) { 1102 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1103 sizeof(md.md_salt)); 1104 g_eli_crypto_hmac_update(&ctx, passphrase, 1105 strlen(passphrase)); 1106 bzero(passphrase, sizeof(passphrase)); 1107 } else if (md.md_iterations > 0) { 1108 u_char dkey[G_ELI_USERKEYLEN]; 1109 1110 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1111 sizeof(md.md_salt), passphrase, md.md_iterations); 1112 bzero(passphrase, sizeof(passphrase)); 1113 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1114 bzero(dkey, sizeof(dkey)); 1115 } 1116 1117 g_eli_crypto_hmac_final(&ctx, key, 0); 1118 1119 /* 1120 * Decrypt Master-Key. 1121 */ 1122 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1123 bzero(key, sizeof(key)); 1124 if (error == -1) { 1125 if (i == tries - 1) { 1126 G_ELI_DEBUG(0, 1127 "Wrong key for %s. No tries left.", 1128 pp->name); 1129 g_eli_keyfiles_clear(pp->name); 1130 return (NULL); 1131 } 1132 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.", 1133 pp->name, tries - i - 1); 1134 /* Try again. */ 1135 continue; 1136 } else if (error > 0) { 1137 G_ELI_DEBUG(0, 1138 "Cannot decrypt Master Key for %s (error=%d).", 1139 pp->name, error); 1140 g_eli_keyfiles_clear(pp->name); 1141 return (NULL); 1142 } 1143 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1144 break; 1145 } 1146 1147 /* 1148 * We have correct key, let's attach provider. 1149 */ 1150 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1151 bzero(mkey, sizeof(mkey)); 1152 bzero(&md, sizeof(md)); 1153 if (gp == NULL) { 1154 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1155 G_ELI_SUFFIX); 1156 return (NULL); 1157 } 1158 return (gp); 1159 } 1160 1161 static void 1162 g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1163 struct g_consumer *cp, struct g_provider *pp) 1164 { 1165 struct g_eli_softc *sc; 1166 1167 g_topology_assert(); 1168 sc = gp->softc; 1169 if (sc == NULL) 1170 return; 1171 if (pp != NULL || cp != NULL) 1172 return; /* Nothing here. */ 1173 1174 sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>\n", indent, 1175 (uintmax_t)sc->sc_ekeys_total); 1176 sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>\n", indent, 1177 (uintmax_t)sc->sc_ekeys_allocated); 1178 sbuf_printf(sb, "%s<Flags>", indent); 1179 if (sc->sc_flags == 0) 1180 sbuf_printf(sb, "NONE"); 1181 else { 1182 int first = 1; 1183 1184 #define ADD_FLAG(flag, name) do { \ 1185 if (sc->sc_flags & (flag)) { \ 1186 if (!first) \ 1187 sbuf_printf(sb, ", "); \ 1188 else \ 1189 first = 0; \ 1190 sbuf_printf(sb, name); \ 1191 } \ 1192 } while (0) 1193 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND"); 1194 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY"); 1195 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1196 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1197 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1198 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1199 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1200 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1201 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1202 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1203 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1204 #undef ADD_FLAG 1205 } 1206 sbuf_printf(sb, "</Flags>\n"); 1207 1208 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1209 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1210 sc->sc_nkey); 1211 } 1212 sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version); 1213 sbuf_printf(sb, "%s<Crypto>", indent); 1214 switch (sc->sc_crypto) { 1215 case G_ELI_CRYPTO_HW: 1216 sbuf_printf(sb, "hardware"); 1217 break; 1218 case G_ELI_CRYPTO_SW: 1219 sbuf_printf(sb, "software"); 1220 break; 1221 default: 1222 sbuf_printf(sb, "UNKNOWN"); 1223 break; 1224 } 1225 sbuf_printf(sb, "</Crypto>\n"); 1226 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1227 sbuf_printf(sb, 1228 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1229 indent, g_eli_algo2str(sc->sc_aalgo)); 1230 } 1231 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1232 sc->sc_ekeylen); 1233 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", 1234 indent, g_eli_algo2str(sc->sc_ealgo)); 1235 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1236 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1237 } 1238 1239 static void 1240 g_eli_shutdown_pre_sync(void *arg, int howto) 1241 { 1242 struct g_class *mp; 1243 struct g_geom *gp, *gp2; 1244 struct g_provider *pp; 1245 struct g_eli_softc *sc; 1246 int error; 1247 1248 mp = arg; 1249 DROP_GIANT(); 1250 g_topology_lock(); 1251 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1252 sc = gp->softc; 1253 if (sc == NULL) 1254 continue; 1255 pp = LIST_FIRST(&gp->provider); 1256 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1257 if (pp->acr + pp->acw + pp->ace == 0) 1258 error = g_eli_destroy(sc, TRUE); 1259 else { 1260 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1261 gp->access = g_eli_access; 1262 } 1263 } 1264 g_topology_unlock(); 1265 PICKUP_GIANT(); 1266 } 1267 1268 static void 1269 g_eli_init(struct g_class *mp) 1270 { 1271 1272 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1273 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1274 if (g_eli_pre_sync == NULL) 1275 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1276 } 1277 1278 static void 1279 g_eli_fini(struct g_class *mp) 1280 { 1281 1282 if (g_eli_pre_sync != NULL) 1283 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1284 } 1285 1286 DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1287 MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1288