1 /*- 2 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 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/sysctl.h> 39 #include <sys/malloc.h> 40 #include <sys/eventhandler.h> 41 #include <sys/kthread.h> 42 #include <sys/proc.h> 43 #include <sys/sched.h> 44 #include <sys/smp.h> 45 #include <sys/uio.h> 46 #include <sys/vnode.h> 47 48 #include <vm/uma.h> 49 50 #include <geom/geom.h> 51 #include <geom/eli/g_eli.h> 52 #include <geom/eli/pkcs5v2.h> 53 54 FEATURE(geom_eli, "GEOM crypto module"); 55 56 MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data"); 57 58 SYSCTL_DECL(_kern_geom); 59 SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff"); 60 int g_eli_debug = 0; 61 TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug); 62 SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0, 63 "Debug level"); 64 static u_int g_eli_tries = 3; 65 TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries); 66 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0, 67 "Number of tries for entering the passphrase"); 68 static u_int g_eli_visible_passphrase = GETS_NOECHO; 69 TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase); 70 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW, 71 &g_eli_visible_passphrase, 0, 72 "Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)"); 73 u_int g_eli_overwrites = G_ELI_OVERWRITES; 74 TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites); 75 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites, 76 0, "Number of times on-disk keys should be overwritten when destroying them"); 77 static u_int g_eli_threads = 0; 78 TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads); 79 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0, 80 "Number of threads doing crypto work"); 81 u_int g_eli_batch = 0; 82 TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch); 83 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0, 84 "Use crypto operations batching"); 85 86 static eventhandler_tag g_eli_pre_sync = NULL; 87 88 static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 89 struct g_geom *gp); 90 static void g_eli_init(struct g_class *mp); 91 static void g_eli_fini(struct g_class *mp); 92 93 static g_taste_t g_eli_taste; 94 static g_dumpconf_t g_eli_dumpconf; 95 96 struct g_class g_eli_class = { 97 .name = G_ELI_CLASS_NAME, 98 .version = G_VERSION, 99 .ctlreq = g_eli_config, 100 .taste = g_eli_taste, 101 .destroy_geom = g_eli_destroy_geom, 102 .init = g_eli_init, 103 .fini = g_eli_fini 104 }; 105 106 107 /* 108 * Code paths: 109 * BIO_READ: 110 * 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 111 * BIO_WRITE: 112 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 113 */ 114 115 116 /* 117 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto 118 * accelerator or something like this. 119 * The function updates the SID and rerun the operation. 120 */ 121 int 122 g_eli_crypto_rerun(struct cryptop *crp) 123 { 124 struct g_eli_softc *sc; 125 struct g_eli_worker *wr; 126 struct bio *bp; 127 int error; 128 129 bp = (struct bio *)crp->crp_opaque; 130 sc = bp->bio_to->geom->softc; 131 LIST_FOREACH(wr, &sc->sc_workers, w_next) { 132 if (wr->w_number == bp->bio_pflags) 133 break; 134 } 135 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags)); 136 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).", 137 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid, 138 (uintmax_t)crp->crp_sid); 139 wr->w_sid = crp->crp_sid; 140 crp->crp_etype = 0; 141 error = crypto_dispatch(crp); 142 if (error == 0) 143 return (0); 144 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error); 145 crp->crp_etype = error; 146 return (error); 147 } 148 149 /* 150 * The function is called afer reading encrypted data from the provider. 151 * 152 * 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 153 */ 154 void 155 g_eli_read_done(struct bio *bp) 156 { 157 struct g_eli_softc *sc; 158 struct bio *pbp; 159 160 G_ELI_LOGREQ(2, bp, "Request done."); 161 pbp = bp->bio_parent; 162 if (pbp->bio_error == 0) 163 pbp->bio_error = bp->bio_error; 164 /* 165 * Do we have all sectors already? 166 */ 167 pbp->bio_inbed++; 168 if (pbp->bio_inbed < pbp->bio_children) 169 return; 170 g_destroy_bio(bp); 171 sc = pbp->bio_to->geom->softc; 172 if (pbp->bio_error != 0) { 173 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__); 174 pbp->bio_completed = 0; 175 if (pbp->bio_driver2 != NULL) { 176 free(pbp->bio_driver2, M_ELI); 177 pbp->bio_driver2 = NULL; 178 } 179 g_io_deliver(pbp, pbp->bio_error); 180 atomic_subtract_int(&sc->sc_inflight, 1); 181 return; 182 } 183 mtx_lock(&sc->sc_queue_mtx); 184 bioq_insert_tail(&sc->sc_queue, pbp); 185 mtx_unlock(&sc->sc_queue_mtx); 186 wakeup(sc); 187 } 188 189 /* 190 * The function is called after we encrypt and write data. 191 * 192 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver 193 */ 194 void 195 g_eli_write_done(struct bio *bp) 196 { 197 struct g_eli_softc *sc; 198 struct bio *pbp; 199 200 G_ELI_LOGREQ(2, bp, "Request done."); 201 pbp = bp->bio_parent; 202 if (pbp->bio_error == 0) { 203 if (bp->bio_error != 0) 204 pbp->bio_error = bp->bio_error; 205 } 206 /* 207 * Do we have all sectors already? 208 */ 209 pbp->bio_inbed++; 210 if (pbp->bio_inbed < pbp->bio_children) 211 return; 212 free(pbp->bio_driver2, M_ELI); 213 pbp->bio_driver2 = NULL; 214 if (pbp->bio_error != 0) { 215 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).", 216 pbp->bio_error); 217 pbp->bio_completed = 0; 218 } 219 g_destroy_bio(bp); 220 /* 221 * Write is finished, send it up. 222 */ 223 pbp->bio_completed = pbp->bio_length; 224 sc = pbp->bio_to->geom->softc; 225 g_io_deliver(pbp, pbp->bio_error); 226 atomic_subtract_int(&sc->sc_inflight, 1); 227 } 228 229 /* 230 * This function should never be called, but GEOM made as it set ->orphan() 231 * method for every geom. 232 */ 233 static void 234 g_eli_orphan_spoil_assert(struct g_consumer *cp) 235 { 236 237 panic("Function %s() called for %s.", __func__, cp->geom->name); 238 } 239 240 static void 241 g_eli_orphan(struct g_consumer *cp) 242 { 243 struct g_eli_softc *sc; 244 245 g_topology_assert(); 246 sc = cp->geom->softc; 247 if (sc == NULL) 248 return; 249 g_eli_destroy(sc, TRUE); 250 } 251 252 /* 253 * BIO_READ: 254 * 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 255 * BIO_WRITE: 256 * G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 257 */ 258 static void 259 g_eli_start(struct bio *bp) 260 { 261 struct g_eli_softc *sc; 262 struct g_consumer *cp; 263 struct bio *cbp; 264 265 sc = bp->bio_to->geom->softc; 266 KASSERT(sc != NULL, 267 ("Provider's error should be set (error=%d)(device=%s).", 268 bp->bio_to->error, bp->bio_to->name)); 269 G_ELI_LOGREQ(2, bp, "Request received."); 270 271 switch (bp->bio_cmd) { 272 case BIO_READ: 273 case BIO_WRITE: 274 case BIO_GETATTR: 275 case BIO_FLUSH: 276 break; 277 case BIO_DELETE: 278 /* 279 * We could eventually support BIO_DELETE request. 280 * It could be done by overwritting requested sector with 281 * random data g_eli_overwrites number of times. 282 */ 283 default: 284 g_io_deliver(bp, EOPNOTSUPP); 285 return; 286 } 287 cbp = g_clone_bio(bp); 288 if (cbp == NULL) { 289 g_io_deliver(bp, ENOMEM); 290 return; 291 } 292 bp->bio_driver1 = cbp; 293 bp->bio_pflags = G_ELI_NEW_BIO; 294 switch (bp->bio_cmd) { 295 case BIO_READ: 296 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) { 297 g_eli_crypto_read(sc, bp, 0); 298 break; 299 } 300 /* FALLTHROUGH */ 301 case BIO_WRITE: 302 mtx_lock(&sc->sc_queue_mtx); 303 bioq_insert_tail(&sc->sc_queue, bp); 304 mtx_unlock(&sc->sc_queue_mtx); 305 wakeup(sc); 306 break; 307 case BIO_GETATTR: 308 case BIO_FLUSH: 309 cbp->bio_done = g_std_done; 310 cp = LIST_FIRST(&sc->sc_geom->consumer); 311 cbp->bio_to = cp->provider; 312 G_ELI_LOGREQ(2, cbp, "Sending request."); 313 g_io_request(cbp, cp); 314 break; 315 } 316 } 317 318 static int 319 g_eli_newsession(struct g_eli_worker *wr) 320 { 321 struct g_eli_softc *sc; 322 struct cryptoini crie, cria; 323 int error; 324 325 sc = wr->w_softc; 326 327 bzero(&crie, sizeof(crie)); 328 crie.cri_alg = sc->sc_ealgo; 329 crie.cri_klen = sc->sc_ekeylen; 330 if (sc->sc_ealgo == CRYPTO_AES_XTS) 331 crie.cri_klen <<= 1; 332 crie.cri_key = sc->sc_ekeys[0]; 333 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 334 bzero(&cria, sizeof(cria)); 335 cria.cri_alg = sc->sc_aalgo; 336 cria.cri_klen = sc->sc_akeylen; 337 cria.cri_key = sc->sc_akey; 338 crie.cri_next = &cria; 339 } 340 341 switch (sc->sc_crypto) { 342 case G_ELI_CRYPTO_SW: 343 error = crypto_newsession(&wr->w_sid, &crie, 344 CRYPTOCAP_F_SOFTWARE); 345 break; 346 case G_ELI_CRYPTO_HW: 347 error = crypto_newsession(&wr->w_sid, &crie, 348 CRYPTOCAP_F_HARDWARE); 349 break; 350 case G_ELI_CRYPTO_UNKNOWN: 351 error = crypto_newsession(&wr->w_sid, &crie, 352 CRYPTOCAP_F_HARDWARE); 353 if (error == 0) { 354 mtx_lock(&sc->sc_queue_mtx); 355 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 356 sc->sc_crypto = G_ELI_CRYPTO_HW; 357 mtx_unlock(&sc->sc_queue_mtx); 358 } else { 359 error = crypto_newsession(&wr->w_sid, &crie, 360 CRYPTOCAP_F_SOFTWARE); 361 mtx_lock(&sc->sc_queue_mtx); 362 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 363 sc->sc_crypto = G_ELI_CRYPTO_SW; 364 mtx_unlock(&sc->sc_queue_mtx); 365 } 366 break; 367 default: 368 panic("%s: invalid condition", __func__); 369 } 370 371 return (error); 372 } 373 374 static void 375 g_eli_freesession(struct g_eli_worker *wr) 376 { 377 378 crypto_freesession(wr->w_sid); 379 } 380 381 static void 382 g_eli_cancel(struct g_eli_softc *sc) 383 { 384 struct bio *bp; 385 386 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 387 388 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 389 KASSERT(bp->bio_pflags == G_ELI_NEW_BIO, 390 ("Not new bio when canceling (bp=%p).", bp)); 391 g_io_deliver(bp, ENXIO); 392 } 393 } 394 395 static struct bio * 396 g_eli_takefirst(struct g_eli_softc *sc) 397 { 398 struct bio *bp; 399 400 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 401 402 if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND)) 403 return (bioq_takefirst(&sc->sc_queue)); 404 /* 405 * Device suspended, so we skip new I/O requests. 406 */ 407 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 408 if (bp->bio_pflags != G_ELI_NEW_BIO) 409 break; 410 } 411 if (bp != NULL) 412 bioq_remove(&sc->sc_queue, bp); 413 return (bp); 414 } 415 416 /* 417 * This is the main function for kernel worker thread when we don't have 418 * hardware acceleration and we have to do cryptography in software. 419 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM 420 * threads with crypto work. 421 */ 422 static void 423 g_eli_worker(void *arg) 424 { 425 struct g_eli_softc *sc; 426 struct g_eli_worker *wr; 427 struct bio *bp; 428 int error; 429 430 wr = arg; 431 sc = wr->w_softc; 432 #ifdef SMP 433 /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */ 434 if (mp_ncpus > 1 && sc->sc_crypto == G_ELI_CRYPTO_SW && 435 g_eli_threads == 0) { 436 while (!smp_started) 437 tsleep(wr, 0, "geli:smp", hz / 4); 438 } 439 #endif 440 thread_lock(curthread); 441 sched_prio(curthread, PUSER); 442 if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0) 443 sched_bind(curthread, wr->w_number); 444 thread_unlock(curthread); 445 446 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm); 447 448 for (;;) { 449 mtx_lock(&sc->sc_queue_mtx); 450 again: 451 bp = g_eli_takefirst(sc); 452 if (bp == NULL) { 453 if (sc->sc_flags & G_ELI_FLAG_DESTROY) { 454 g_eli_cancel(sc); 455 LIST_REMOVE(wr, w_next); 456 g_eli_freesession(wr); 457 free(wr, M_ELI); 458 G_ELI_DEBUG(1, "Thread %s exiting.", 459 curthread->td_proc->p_comm); 460 wakeup(&sc->sc_workers); 461 mtx_unlock(&sc->sc_queue_mtx); 462 kproc_exit(0); 463 } 464 while (sc->sc_flags & G_ELI_FLAG_SUSPEND) { 465 if (sc->sc_inflight > 0) { 466 G_ELI_DEBUG(0, "inflight=%d", sc->sc_inflight); 467 /* 468 * We still have inflight BIOs, so 469 * sleep and retry. 470 */ 471 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 472 "geli:inf", hz / 5); 473 goto again; 474 } 475 /* 476 * Suspend requested, mark the worker as 477 * suspended and go to sleep. 478 */ 479 if (wr->w_active) { 480 g_eli_freesession(wr); 481 wr->w_active = FALSE; 482 } 483 wakeup(&sc->sc_workers); 484 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 485 "geli:suspend", 0); 486 if (!wr->w_active && 487 !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) { 488 error = g_eli_newsession(wr); 489 KASSERT(error == 0, 490 ("g_eli_newsession() failed on resume (error=%d)", 491 error)); 492 wr->w_active = TRUE; 493 } 494 goto again; 495 } 496 msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0); 497 continue; 498 } 499 if (bp->bio_pflags == G_ELI_NEW_BIO) 500 atomic_add_int(&sc->sc_inflight, 1); 501 mtx_unlock(&sc->sc_queue_mtx); 502 if (bp->bio_pflags == G_ELI_NEW_BIO) { 503 bp->bio_pflags = 0; 504 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 505 if (bp->bio_cmd == BIO_READ) 506 g_eli_auth_read(sc, bp); 507 else 508 g_eli_auth_run(wr, bp); 509 } else { 510 if (bp->bio_cmd == BIO_READ) 511 g_eli_crypto_read(sc, bp, 1); 512 else 513 g_eli_crypto_run(wr, bp); 514 } 515 } else { 516 if (sc->sc_flags & G_ELI_FLAG_AUTH) 517 g_eli_auth_run(wr, bp); 518 else 519 g_eli_crypto_run(wr, bp); 520 } 521 } 522 } 523 524 /* 525 * Select encryption key. If G_ELI_FLAG_SINGLE_KEY is present we only have one 526 * key available for all the data. If the flag is not present select the key 527 * based on data offset. 528 */ 529 uint8_t * 530 g_eli_crypto_key(struct g_eli_softc *sc, off_t offset, size_t blocksize) 531 { 532 u_int nkey; 533 534 if (sc->sc_nekeys == 1) 535 return (sc->sc_ekeys[0]); 536 537 KASSERT(sc->sc_nekeys > 1, ("%s: sc_nekeys=%u", __func__, 538 sc->sc_nekeys)); 539 KASSERT((sc->sc_flags & G_ELI_FLAG_SINGLE_KEY) == 0, 540 ("%s: SINGLE_KEY flag set, but sc_nekeys=%u", __func__, 541 sc->sc_nekeys)); 542 543 /* We switch key every 2^G_ELI_KEY_SHIFT blocks. */ 544 nkey = (offset >> G_ELI_KEY_SHIFT) / blocksize; 545 546 KASSERT(nkey < sc->sc_nekeys, ("%s: nkey=%u >= sc_nekeys=%u", __func__, 547 nkey, sc->sc_nekeys)); 548 549 return (sc->sc_ekeys[nkey]); 550 } 551 552 /* 553 * Here we generate IV. It is unique for every sector. 554 */ 555 void 556 g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 557 size_t size) 558 { 559 uint8_t off[8]; 560 561 if ((sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER) != 0) 562 bcopy(&offset, off, sizeof(off)); 563 else 564 le64enc(off, (uint64_t)offset); 565 566 switch (sc->sc_ealgo) { 567 case CRYPTO_AES_XTS: 568 bcopy(off, iv, sizeof(off)); 569 bzero(iv + sizeof(off), size - sizeof(off)); 570 break; 571 default: 572 { 573 u_char hash[SHA256_DIGEST_LENGTH]; 574 SHA256_CTX ctx; 575 576 /* Copy precalculated SHA256 context for IV-Key. */ 577 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx)); 578 SHA256_Update(&ctx, off, sizeof(off)); 579 SHA256_Final(hash, &ctx); 580 bcopy(hash, iv, MIN(sizeof(hash), size)); 581 break; 582 } 583 } 584 } 585 586 int 587 g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 588 struct g_eli_metadata *md) 589 { 590 struct g_geom *gp; 591 struct g_consumer *cp; 592 u_char *buf = NULL; 593 int error; 594 595 g_topology_assert(); 596 597 gp = g_new_geomf(mp, "eli:taste"); 598 gp->start = g_eli_start; 599 gp->access = g_std_access; 600 /* 601 * g_eli_read_metadata() is always called from the event thread. 602 * Our geom is created and destroyed in the same event, so there 603 * could be no orphan nor spoil event in the meantime. 604 */ 605 gp->orphan = g_eli_orphan_spoil_assert; 606 gp->spoiled = g_eli_orphan_spoil_assert; 607 cp = g_new_consumer(gp); 608 error = g_attach(cp, pp); 609 if (error != 0) 610 goto end; 611 error = g_access(cp, 1, 0, 0); 612 if (error != 0) 613 goto end; 614 g_topology_unlock(); 615 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 616 &error); 617 g_topology_lock(); 618 if (buf == NULL) 619 goto end; 620 eli_metadata_decode(buf, md); 621 end: 622 if (buf != NULL) 623 g_free(buf); 624 if (cp->provider != NULL) { 625 if (cp->acr == 1) 626 g_access(cp, -1, 0, 0); 627 g_detach(cp); 628 } 629 g_destroy_consumer(cp); 630 g_destroy_geom(gp); 631 return (error); 632 } 633 634 /* 635 * The function is called when we had last close on provider and user requested 636 * to close it when this situation occur. 637 */ 638 static void 639 g_eli_last_close(struct g_eli_softc *sc) 640 { 641 struct g_geom *gp; 642 struct g_provider *pp; 643 char ppname[64]; 644 int error; 645 646 g_topology_assert(); 647 gp = sc->sc_geom; 648 pp = LIST_FIRST(&gp->provider); 649 strlcpy(ppname, pp->name, sizeof(ppname)); 650 error = g_eli_destroy(sc, TRUE); 651 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 652 ppname, error)); 653 G_ELI_DEBUG(0, "Detached %s on last close.", ppname); 654 } 655 656 int 657 g_eli_access(struct g_provider *pp, int dr, int dw, int de) 658 { 659 struct g_eli_softc *sc; 660 struct g_geom *gp; 661 662 gp = pp->geom; 663 sc = gp->softc; 664 665 if (dw > 0) { 666 if (sc->sc_flags & G_ELI_FLAG_RO) { 667 /* Deny write attempts. */ 668 return (EROFS); 669 } 670 /* Someone is opening us for write, we need to remember that. */ 671 sc->sc_flags |= G_ELI_FLAG_WOPEN; 672 return (0); 673 } 674 /* Is this the last close? */ 675 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 676 return (0); 677 678 /* 679 * Automatically detach on last close if requested. 680 */ 681 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 682 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 683 g_eli_last_close(sc); 684 } 685 return (0); 686 } 687 688 static int 689 g_eli_cpu_is_disabled(int cpu) 690 { 691 #ifdef SMP 692 return ((hlt_cpus_mask & (1 << cpu)) != 0); 693 #else 694 return (0); 695 #endif 696 } 697 698 struct g_geom * 699 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 700 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 701 { 702 struct g_eli_softc *sc; 703 struct g_eli_worker *wr; 704 struct g_geom *gp; 705 struct g_provider *pp; 706 struct g_consumer *cp; 707 u_int i, threads; 708 int error; 709 710 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 711 712 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 713 gp->softc = NULL; /* for a moment */ 714 715 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 716 gp->start = g_eli_start; 717 /* 718 * Spoiling cannot happen actually, because we keep provider open for 719 * writing all the time or provider is read-only. 720 */ 721 gp->spoiled = g_eli_orphan_spoil_assert; 722 gp->orphan = g_eli_orphan; 723 gp->dumpconf = g_eli_dumpconf; 724 /* 725 * If detach-on-last-close feature is not enabled and we don't operate 726 * on read-only provider, we can simply use g_std_access(). 727 */ 728 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 729 gp->access = g_eli_access; 730 else 731 gp->access = g_std_access; 732 733 sc->sc_inflight = 0; 734 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 735 sc->sc_flags = md->md_flags; 736 /* Backward compatibility. */ 737 if (md->md_version < 4) 738 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 739 if (md->md_version < 5) 740 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 741 sc->sc_ealgo = md->md_ealgo; 742 sc->sc_nkey = nkey; 743 744 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 745 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 746 sc->sc_aalgo = md->md_aalgo; 747 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 748 749 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 750 /* 751 * Some hash functions (like SHA1 and RIPEMD160) generates hash 752 * which length is not multiple of 128 bits, but we want data 753 * length to be multiple of 128, so we can encrypt without 754 * padding. The line below rounds down data length to multiple 755 * of 128 bits. 756 */ 757 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 758 759 sc->sc_bytes_per_sector = 760 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 761 sc->sc_bytes_per_sector *= bpp->sectorsize; 762 } 763 764 gp->softc = sc; 765 sc->sc_geom = gp; 766 767 bioq_init(&sc->sc_queue); 768 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 769 770 pp = NULL; 771 cp = g_new_consumer(gp); 772 error = g_attach(cp, bpp); 773 if (error != 0) { 774 if (req != NULL) { 775 gctl_error(req, "Cannot attach to %s (error=%d).", 776 bpp->name, error); 777 } else { 778 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 779 bpp->name, error); 780 } 781 goto failed; 782 } 783 /* 784 * Keep provider open all the time, so we can run critical tasks, 785 * like Master Keys deletion, without wondering if we can open 786 * provider or not. 787 * We don't open provider for writing only when user requested read-only 788 * access. 789 */ 790 if (sc->sc_flags & G_ELI_FLAG_RO) 791 error = g_access(cp, 1, 0, 1); 792 else 793 error = g_access(cp, 1, 1, 1); 794 if (error != 0) { 795 if (req != NULL) { 796 gctl_error(req, "Cannot access %s (error=%d).", 797 bpp->name, error); 798 } else { 799 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 800 bpp->name, error); 801 } 802 goto failed; 803 } 804 805 sc->sc_sectorsize = md->md_sectorsize; 806 sc->sc_mediasize = bpp->mediasize; 807 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 808 sc->sc_mediasize -= bpp->sectorsize; 809 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 810 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 811 else { 812 sc->sc_mediasize /= sc->sc_bytes_per_sector; 813 sc->sc_mediasize *= sc->sc_sectorsize; 814 } 815 816 /* 817 * Remember the keys in our softc structure. 818 */ 819 g_eli_mkey_propagate(sc, mkey); 820 sc->sc_ekeylen = md->md_keylen; 821 822 LIST_INIT(&sc->sc_workers); 823 824 threads = g_eli_threads; 825 if (threads == 0) 826 threads = mp_ncpus; 827 else if (threads > mp_ncpus) { 828 /* There is really no need for too many worker threads. */ 829 threads = mp_ncpus; 830 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads); 831 } 832 for (i = 0; i < threads; i++) { 833 if (g_eli_cpu_is_disabled(i)) { 834 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 835 bpp->name, i); 836 continue; 837 } 838 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 839 wr->w_softc = sc; 840 wr->w_number = i; 841 wr->w_active = TRUE; 842 843 error = g_eli_newsession(wr); 844 if (error != 0) { 845 free(wr, M_ELI); 846 if (req != NULL) { 847 gctl_error(req, "Cannot set up crypto session " 848 "for %s (error=%d).", bpp->name, error); 849 } else { 850 G_ELI_DEBUG(1, "Cannot set up crypto session " 851 "for %s (error=%d).", bpp->name, error); 852 } 853 goto failed; 854 } 855 856 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 857 "g_eli[%u] %s", i, bpp->name); 858 if (error != 0) { 859 g_eli_freesession(wr); 860 free(wr, M_ELI); 861 if (req != NULL) { 862 gctl_error(req, "Cannot create kernel thread " 863 "for %s (error=%d).", bpp->name, error); 864 } else { 865 G_ELI_DEBUG(1, "Cannot create kernel thread " 866 "for %s (error=%d).", bpp->name, error); 867 } 868 goto failed; 869 } 870 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 871 /* If we have hardware support, one thread is enough. */ 872 if (sc->sc_crypto == G_ELI_CRYPTO_HW) 873 break; 874 } 875 876 /* 877 * Create decrypted provider. 878 */ 879 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 880 pp->mediasize = sc->sc_mediasize; 881 pp->sectorsize = sc->sc_sectorsize; 882 883 g_error_provider(pp, 0); 884 885 G_ELI_DEBUG(0, "Device %s created.", pp->name); 886 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 887 sc->sc_ekeylen); 888 if (sc->sc_flags & G_ELI_FLAG_AUTH) 889 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 890 G_ELI_DEBUG(0, " Crypto: %s", 891 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 892 return (gp); 893 failed: 894 mtx_lock(&sc->sc_queue_mtx); 895 sc->sc_flags |= G_ELI_FLAG_DESTROY; 896 wakeup(sc); 897 /* 898 * Wait for kernel threads self destruction. 899 */ 900 while (!LIST_EMPTY(&sc->sc_workers)) { 901 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 902 "geli:destroy", 0); 903 } 904 mtx_destroy(&sc->sc_queue_mtx); 905 if (cp->provider != NULL) { 906 if (cp->acr == 1) 907 g_access(cp, -1, -1, -1); 908 g_detach(cp); 909 } 910 g_destroy_consumer(cp); 911 g_destroy_geom(gp); 912 if (sc->sc_ekeys != NULL) { 913 bzero(sc->sc_ekeys, 914 sc->sc_nekeys * (sizeof(uint8_t *) + G_ELI_DATAKEYLEN)); 915 free(sc->sc_ekeys, M_ELI); 916 } 917 bzero(sc, sizeof(*sc)); 918 free(sc, M_ELI); 919 return (NULL); 920 } 921 922 int 923 g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 924 { 925 struct g_geom *gp; 926 struct g_provider *pp; 927 928 g_topology_assert(); 929 930 if (sc == NULL) 931 return (ENXIO); 932 933 gp = sc->sc_geom; 934 pp = LIST_FIRST(&gp->provider); 935 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 936 if (force) { 937 G_ELI_DEBUG(1, "Device %s is still open, so it " 938 "cannot be definitely removed.", pp->name); 939 } else { 940 G_ELI_DEBUG(1, 941 "Device %s is still open (r%dw%de%d).", pp->name, 942 pp->acr, pp->acw, pp->ace); 943 return (EBUSY); 944 } 945 } 946 947 mtx_lock(&sc->sc_queue_mtx); 948 sc->sc_flags |= G_ELI_FLAG_DESTROY; 949 wakeup(sc); 950 while (!LIST_EMPTY(&sc->sc_workers)) { 951 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 952 "geli:destroy", 0); 953 } 954 mtx_destroy(&sc->sc_queue_mtx); 955 gp->softc = NULL; 956 if (sc->sc_ekeys != NULL) { 957 /* The sc_ekeys field can be NULL is device is suspended. */ 958 bzero(sc->sc_ekeys, 959 sc->sc_nekeys * (sizeof(uint8_t *) + G_ELI_DATAKEYLEN)); 960 free(sc->sc_ekeys, M_ELI); 961 } 962 bzero(sc, sizeof(*sc)); 963 free(sc, M_ELI); 964 965 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 966 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 967 g_wither_geom_close(gp, ENXIO); 968 969 return (0); 970 } 971 972 static int 973 g_eli_destroy_geom(struct gctl_req *req __unused, 974 struct g_class *mp __unused, struct g_geom *gp) 975 { 976 struct g_eli_softc *sc; 977 978 sc = gp->softc; 979 return (g_eli_destroy(sc, FALSE)); 980 } 981 982 static int 983 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 984 { 985 u_char *keyfile, *data; 986 char *file, name[64]; 987 size_t size; 988 int i; 989 990 for (i = 0; ; i++) { 991 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 992 keyfile = preload_search_by_type(name); 993 if (keyfile == NULL) 994 return (i); /* Return number of loaded keyfiles. */ 995 data = preload_fetch_addr(keyfile); 996 if (data == NULL) { 997 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 998 name); 999 return (0); 1000 } 1001 size = preload_fetch_size(keyfile); 1002 if (size == 0) { 1003 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 1004 name); 1005 return (0); 1006 } 1007 file = preload_search_info(keyfile, MODINFO_NAME); 1008 if (file == NULL) { 1009 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 1010 name); 1011 return (0); 1012 } 1013 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 1014 provider, name); 1015 g_eli_crypto_hmac_update(ctx, data, size); 1016 } 1017 } 1018 1019 static void 1020 g_eli_keyfiles_clear(const char *provider) 1021 { 1022 u_char *keyfile, *data; 1023 char name[64]; 1024 size_t size; 1025 int i; 1026 1027 for (i = 0; ; i++) { 1028 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1029 keyfile = preload_search_by_type(name); 1030 if (keyfile == NULL) 1031 return; 1032 data = preload_fetch_addr(keyfile); 1033 size = preload_fetch_size(keyfile); 1034 if (data != NULL && size != 0) 1035 bzero(data, size); 1036 } 1037 } 1038 1039 /* 1040 * Tasting is only made on boot. 1041 * We detect providers which should be attached before root is mounted. 1042 */ 1043 static struct g_geom * 1044 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 1045 { 1046 struct g_eli_metadata md; 1047 struct g_geom *gp; 1048 struct hmac_ctx ctx; 1049 char passphrase[256]; 1050 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 1051 u_int i, nkey, nkeyfiles, tries; 1052 int error; 1053 1054 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1055 g_topology_assert(); 1056 1057 if (root_mounted() || g_eli_tries == 0) 1058 return (NULL); 1059 1060 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1061 1062 error = g_eli_read_metadata(mp, pp, &md); 1063 if (error != 0) 1064 return (NULL); 1065 gp = NULL; 1066 1067 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1068 return (NULL); 1069 if (md.md_version > G_ELI_VERSION) { 1070 printf("geom_eli.ko module is too old to handle %s.\n", 1071 pp->name); 1072 return (NULL); 1073 } 1074 if (md.md_provsize != pp->mediasize) 1075 return (NULL); 1076 /* Should we attach it on boot? */ 1077 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1078 return (NULL); 1079 if (md.md_keys == 0x00) { 1080 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1081 return (NULL); 1082 } 1083 if (md.md_iterations == -1) { 1084 /* If there is no passphrase, we try only once. */ 1085 tries = 1; 1086 } else { 1087 /* Ask for the passphrase no more than g_eli_tries times. */ 1088 tries = g_eli_tries; 1089 } 1090 1091 for (i = 0; i < tries; i++) { 1092 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1093 1094 /* 1095 * Load all key files. 1096 */ 1097 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1098 1099 if (nkeyfiles == 0 && md.md_iterations == -1) { 1100 /* 1101 * No key files and no passphrase, something is 1102 * definitely wrong here. 1103 * geli(8) doesn't allow for such situation, so assume 1104 * that there was really no passphrase and in that case 1105 * key files are no properly defined in loader.conf. 1106 */ 1107 G_ELI_DEBUG(0, 1108 "Found no key files in loader.conf for %s.", 1109 pp->name); 1110 return (NULL); 1111 } 1112 1113 /* Ask for the passphrase if defined. */ 1114 if (md.md_iterations >= 0) { 1115 printf("Enter passphrase for %s: ", pp->name); 1116 gets(passphrase, sizeof(passphrase), 1117 g_eli_visible_passphrase); 1118 } 1119 1120 /* 1121 * Prepare Derived-Key from the user passphrase. 1122 */ 1123 if (md.md_iterations == 0) { 1124 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1125 sizeof(md.md_salt)); 1126 g_eli_crypto_hmac_update(&ctx, passphrase, 1127 strlen(passphrase)); 1128 bzero(passphrase, sizeof(passphrase)); 1129 } else if (md.md_iterations > 0) { 1130 u_char dkey[G_ELI_USERKEYLEN]; 1131 1132 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1133 sizeof(md.md_salt), passphrase, md.md_iterations); 1134 bzero(passphrase, sizeof(passphrase)); 1135 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1136 bzero(dkey, sizeof(dkey)); 1137 } 1138 1139 g_eli_crypto_hmac_final(&ctx, key, 0); 1140 1141 /* 1142 * Decrypt Master-Key. 1143 */ 1144 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1145 bzero(key, sizeof(key)); 1146 if (error == -1) { 1147 if (i == tries - 1) { 1148 G_ELI_DEBUG(0, 1149 "Wrong key for %s. No tries left.", 1150 pp->name); 1151 g_eli_keyfiles_clear(pp->name); 1152 return (NULL); 1153 } 1154 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.", 1155 pp->name, tries - i - 1); 1156 /* Try again. */ 1157 continue; 1158 } else if (error > 0) { 1159 G_ELI_DEBUG(0, "Cannot decrypt Master Key for %s (error=%d).", 1160 pp->name, error); 1161 g_eli_keyfiles_clear(pp->name); 1162 return (NULL); 1163 } 1164 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1165 break; 1166 } 1167 1168 /* 1169 * We have correct key, let's attach provider. 1170 */ 1171 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1172 bzero(mkey, sizeof(mkey)); 1173 bzero(&md, sizeof(md)); 1174 if (gp == NULL) { 1175 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1176 G_ELI_SUFFIX); 1177 return (NULL); 1178 } 1179 return (gp); 1180 } 1181 1182 static void 1183 g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1184 struct g_consumer *cp, struct g_provider *pp) 1185 { 1186 struct g_eli_softc *sc; 1187 1188 g_topology_assert(); 1189 sc = gp->softc; 1190 if (sc == NULL) 1191 return; 1192 if (pp != NULL || cp != NULL) 1193 return; /* Nothing here. */ 1194 sbuf_printf(sb, "%s<Flags>", indent); 1195 if (sc->sc_flags == 0) 1196 sbuf_printf(sb, "NONE"); 1197 else { 1198 int first = 1; 1199 1200 #define ADD_FLAG(flag, name) do { \ 1201 if (sc->sc_flags & (flag)) { \ 1202 if (!first) \ 1203 sbuf_printf(sb, ", "); \ 1204 else \ 1205 first = 0; \ 1206 sbuf_printf(sb, name); \ 1207 } \ 1208 } while (0) 1209 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND"); 1210 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY"); 1211 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1212 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1213 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1214 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1215 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1216 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1217 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1218 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1219 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1220 #undef ADD_FLAG 1221 } 1222 sbuf_printf(sb, "</Flags>\n"); 1223 1224 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1225 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1226 sc->sc_nkey); 1227 } 1228 sbuf_printf(sb, "%s<Crypto>", indent); 1229 switch (sc->sc_crypto) { 1230 case G_ELI_CRYPTO_HW: 1231 sbuf_printf(sb, "hardware"); 1232 break; 1233 case G_ELI_CRYPTO_SW: 1234 sbuf_printf(sb, "software"); 1235 break; 1236 default: 1237 sbuf_printf(sb, "UNKNOWN"); 1238 break; 1239 } 1240 sbuf_printf(sb, "</Crypto>\n"); 1241 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1242 sbuf_printf(sb, 1243 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1244 indent, g_eli_algo2str(sc->sc_aalgo)); 1245 } 1246 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1247 sc->sc_ekeylen); 1248 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent, 1249 g_eli_algo2str(sc->sc_ealgo)); 1250 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1251 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1252 } 1253 1254 static void 1255 g_eli_shutdown_pre_sync(void *arg, int howto) 1256 { 1257 struct g_class *mp; 1258 struct g_geom *gp, *gp2; 1259 struct g_provider *pp; 1260 struct g_eli_softc *sc; 1261 int error; 1262 1263 mp = arg; 1264 DROP_GIANT(); 1265 g_topology_lock(); 1266 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1267 sc = gp->softc; 1268 if (sc == NULL) 1269 continue; 1270 pp = LIST_FIRST(&gp->provider); 1271 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1272 if (pp->acr + pp->acw + pp->ace == 0) 1273 error = g_eli_destroy(sc, TRUE); 1274 else { 1275 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1276 gp->access = g_eli_access; 1277 } 1278 } 1279 g_topology_unlock(); 1280 PICKUP_GIANT(); 1281 } 1282 1283 static void 1284 g_eli_init(struct g_class *mp) 1285 { 1286 1287 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1288 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1289 if (g_eli_pre_sync == NULL) 1290 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1291 } 1292 1293 static void 1294 g_eli_fini(struct g_class *mp) 1295 { 1296 1297 if (g_eli_pre_sync != NULL) 1298 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1299 } 1300 1301 DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1302 MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1303