1 /* $NetBSD: cgd.c,v 1.104 2015/08/27 05:51:50 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Roland C. Dowdeswell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: cgd.c,v 1.104 2015/08/27 05:51:50 mlelstv Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/errno.h> 40 #include <sys/buf.h> 41 #include <sys/bufq.h> 42 #include <sys/malloc.h> 43 #include <sys/module.h> 44 #include <sys/pool.h> 45 #include <sys/ioctl.h> 46 #include <sys/device.h> 47 #include <sys/disk.h> 48 #include <sys/disklabel.h> 49 #include <sys/fcntl.h> 50 #include <sys/namei.h> /* for pathbuf */ 51 #include <sys/vnode.h> 52 #include <sys/conf.h> 53 #include <sys/syslog.h> 54 55 #include <dev/dkvar.h> 56 #include <dev/cgdvar.h> 57 58 #include <miscfs/specfs/specdev.h> /* for v_rdev */ 59 60 #include "ioconf.h" 61 62 /* Entry Point Functions */ 63 64 static dev_type_open(cgdopen); 65 static dev_type_close(cgdclose); 66 static dev_type_read(cgdread); 67 static dev_type_write(cgdwrite); 68 static dev_type_ioctl(cgdioctl); 69 static dev_type_strategy(cgdstrategy); 70 static dev_type_dump(cgddump); 71 static dev_type_size(cgdsize); 72 73 const struct bdevsw cgd_bdevsw = { 74 .d_open = cgdopen, 75 .d_close = cgdclose, 76 .d_strategy = cgdstrategy, 77 .d_ioctl = cgdioctl, 78 .d_dump = cgddump, 79 .d_psize = cgdsize, 80 .d_discard = nodiscard, 81 .d_flag = D_DISK 82 }; 83 84 const struct cdevsw cgd_cdevsw = { 85 .d_open = cgdopen, 86 .d_close = cgdclose, 87 .d_read = cgdread, 88 .d_write = cgdwrite, 89 .d_ioctl = cgdioctl, 90 .d_stop = nostop, 91 .d_tty = notty, 92 .d_poll = nopoll, 93 .d_mmap = nommap, 94 .d_kqfilter = nokqfilter, 95 .d_discard = nodiscard, 96 .d_flag = D_DISK 97 }; 98 99 static int cgd_match(device_t, cfdata_t, void *); 100 static void cgd_attach(device_t, device_t, void *); 101 static int cgd_detach(device_t, int); 102 static struct cgd_softc *cgd_spawn(int); 103 static int cgd_destroy(device_t); 104 105 /* Internal Functions */ 106 107 static int cgd_diskstart(device_t, struct buf *); 108 static void cgdiodone(struct buf *); 109 110 static int cgd_ioctl_set(struct cgd_softc *, void *, struct lwp *); 111 static int cgd_ioctl_clr(struct cgd_softc *, struct lwp *); 112 static int cgd_ioctl_get(dev_t, void *, struct lwp *); 113 static int cgdinit(struct cgd_softc *, const char *, struct vnode *, 114 struct lwp *); 115 static void cgd_cipher(struct cgd_softc *, void *, void *, 116 size_t, daddr_t, size_t, int); 117 118 static struct dkdriver cgddkdriver = { 119 .d_minphys = minphys, 120 .d_open = cgdopen, 121 .d_close = cgdclose, 122 .d_strategy = cgdstrategy, 123 .d_iosize = NULL, 124 .d_diskstart = cgd_diskstart, 125 .d_dumpblocks = NULL, 126 .d_lastclose = NULL 127 }; 128 129 CFATTACH_DECL3_NEW(cgd, sizeof(struct cgd_softc), 130 cgd_match, cgd_attach, cgd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 131 extern struct cfdriver cgd_cd; 132 133 /* DIAGNOSTIC and DEBUG definitions */ 134 135 #if defined(CGDDEBUG) && !defined(DEBUG) 136 #define DEBUG 137 #endif 138 139 #ifdef DEBUG 140 int cgddebug = 0; 141 142 #define CGDB_FOLLOW 0x1 143 #define CGDB_IO 0x2 144 #define CGDB_CRYPTO 0x4 145 146 #define IFDEBUG(x,y) if (cgddebug & (x)) y 147 #define DPRINTF(x,y) IFDEBUG(x, printf y) 148 #define DPRINTF_FOLLOW(y) DPRINTF(CGDB_FOLLOW, y) 149 150 static void hexprint(const char *, void *, int); 151 152 #else 153 #define IFDEBUG(x,y) 154 #define DPRINTF(x,y) 155 #define DPRINTF_FOLLOW(y) 156 #endif 157 158 #ifdef DIAGNOSTIC 159 #define DIAGPANIC(x) panic x 160 #define DIAGCONDPANIC(x,y) if (x) panic y 161 #else 162 #define DIAGPANIC(x) 163 #define DIAGCONDPANIC(x,y) 164 #endif 165 166 /* Global variables */ 167 168 /* Utility Functions */ 169 170 #define CGDUNIT(x) DISKUNIT(x) 171 #define GETCGD_SOFTC(_cs, x) if (!((_cs) = getcgd_softc(x))) return ENXIO 172 173 /* The code */ 174 175 static struct cgd_softc * 176 getcgd_softc(dev_t dev) 177 { 178 int unit = CGDUNIT(dev); 179 struct cgd_softc *sc; 180 181 DPRINTF_FOLLOW(("getcgd_softc(0x%"PRIx64"): unit = %d\n", dev, unit)); 182 183 sc = device_lookup_private(&cgd_cd, unit); 184 if (sc == NULL) 185 sc = cgd_spawn(unit); 186 return sc; 187 } 188 189 static int 190 cgd_match(device_t self, cfdata_t cfdata, void *aux) 191 { 192 193 return 1; 194 } 195 196 static void 197 cgd_attach(device_t parent, device_t self, void *aux) 198 { 199 struct cgd_softc *sc = device_private(self); 200 201 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_BIO); 202 dk_init(&sc->sc_dksc, self, DKTYPE_CGD); 203 disk_init(&sc->sc_dksc.sc_dkdev, sc->sc_dksc.sc_xname, &cgddkdriver); 204 205 if (!pmf_device_register(self, NULL, NULL)) 206 aprint_error_dev(self, "unable to register power management hooks\n"); 207 } 208 209 210 static int 211 cgd_detach(device_t self, int flags) 212 { 213 int ret; 214 const int pmask = 1 << RAW_PART; 215 struct cgd_softc *sc = device_private(self); 216 struct dk_softc *dksc = &sc->sc_dksc; 217 218 if (DK_BUSY(dksc, pmask)) 219 return EBUSY; 220 221 if (DK_ATTACHED(dksc) && 222 (ret = cgd_ioctl_clr(sc, curlwp)) != 0) 223 return ret; 224 225 disk_destroy(&dksc->sc_dkdev); 226 mutex_destroy(&sc->sc_lock); 227 228 return 0; 229 } 230 231 void 232 cgdattach(int num) 233 { 234 int error; 235 236 error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca); 237 if (error != 0) 238 aprint_error("%s: unable to register cfattach\n", 239 cgd_cd.cd_name); 240 } 241 242 static struct cgd_softc * 243 cgd_spawn(int unit) 244 { 245 cfdata_t cf; 246 247 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 248 cf->cf_name = cgd_cd.cd_name; 249 cf->cf_atname = cgd_cd.cd_name; 250 cf->cf_unit = unit; 251 cf->cf_fstate = FSTATE_STAR; 252 253 return device_private(config_attach_pseudo(cf)); 254 } 255 256 static int 257 cgd_destroy(device_t dev) 258 { 259 int error; 260 cfdata_t cf; 261 262 cf = device_cfdata(dev); 263 error = config_detach(dev, DETACH_QUIET); 264 if (error) 265 return error; 266 free(cf, M_DEVBUF); 267 return 0; 268 } 269 270 static int 271 cgdopen(dev_t dev, int flags, int fmt, struct lwp *l) 272 { 273 struct cgd_softc *cs; 274 275 DPRINTF_FOLLOW(("cgdopen(0x%"PRIx64", %d)\n", dev, flags)); 276 GETCGD_SOFTC(cs, dev); 277 return dk_open(&cs->sc_dksc, dev, flags, fmt, l); 278 } 279 280 static int 281 cgdclose(dev_t dev, int flags, int fmt, struct lwp *l) 282 { 283 int error; 284 struct cgd_softc *cs; 285 struct dk_softc *dksc; 286 287 DPRINTF_FOLLOW(("cgdclose(0x%"PRIx64", %d)\n", dev, flags)); 288 GETCGD_SOFTC(cs, dev); 289 dksc = &cs->sc_dksc; 290 if ((error = dk_close(dksc, dev, flags, fmt, l)) != 0) 291 return error; 292 293 if (!DK_ATTACHED(dksc)) { 294 if ((error = cgd_destroy(cs->sc_dksc.sc_dev)) != 0) { 295 aprint_error_dev(dksc->sc_dev, 296 "unable to detach instance\n"); 297 return error; 298 } 299 } 300 return 0; 301 } 302 303 static void 304 cgdstrategy(struct buf *bp) 305 { 306 struct cgd_softc *cs = getcgd_softc(bp->b_dev); 307 308 DPRINTF_FOLLOW(("cgdstrategy(%p): b_bcount = %ld\n", bp, 309 (long)bp->b_bcount)); 310 311 /* 312 * Reject unaligned writes. We can encrypt and decrypt only 313 * complete disk sectors, and we let the ciphers require their 314 * buffers to be aligned to 32-bit boundaries. 315 */ 316 if (bp->b_blkno < 0 || 317 (bp->b_bcount % DEV_BSIZE) != 0 || 318 ((uintptr_t)bp->b_data & 3) != 0) { 319 bp->b_error = EINVAL; 320 bp->b_resid = bp->b_bcount; 321 biodone(bp); 322 return; 323 } 324 325 /* XXXrcd: Should we test for (cs != NULL)? */ 326 dk_strategy(&cs->sc_dksc, bp); 327 return; 328 } 329 330 static int 331 cgdsize(dev_t dev) 332 { 333 struct cgd_softc *cs = getcgd_softc(dev); 334 335 DPRINTF_FOLLOW(("cgdsize(0x%"PRIx64")\n", dev)); 336 if (!cs) 337 return -1; 338 return dk_size(&cs->sc_dksc, dev); 339 } 340 341 /* 342 * cgd_{get,put}data are functions that deal with getting a buffer 343 * for the new encrypted data. We have a buffer per device so that 344 * we can ensure that we can always have a transaction in flight. 345 * We use this buffer first so that we have one less piece of 346 * malloc'ed data at any given point. 347 */ 348 349 static void * 350 cgd_getdata(struct dk_softc *dksc, unsigned long size) 351 { 352 struct cgd_softc *cs = (struct cgd_softc *)dksc; 353 void * data = NULL; 354 355 mutex_enter(&cs->sc_lock); 356 if (cs->sc_data_used == 0) { 357 cs->sc_data_used = 1; 358 data = cs->sc_data; 359 } 360 mutex_exit(&cs->sc_lock); 361 362 if (data) 363 return data; 364 365 return malloc(size, M_DEVBUF, M_NOWAIT); 366 } 367 368 static void 369 cgd_putdata(struct dk_softc *dksc, void *data) 370 { 371 struct cgd_softc *cs = (struct cgd_softc *)dksc; 372 373 if (data == cs->sc_data) { 374 mutex_enter(&cs->sc_lock); 375 cs->sc_data_used = 0; 376 mutex_exit(&cs->sc_lock); 377 } else { 378 free(data, M_DEVBUF); 379 } 380 } 381 382 static int 383 cgd_diskstart(device_t dev, struct buf *bp) 384 { 385 struct cgd_softc *cs = device_private(dev); 386 struct dk_softc *dksc = &cs->sc_dksc; 387 struct buf *nbp; 388 void * addr; 389 void * newaddr; 390 daddr_t bn; 391 struct vnode *vp; 392 393 DPRINTF_FOLLOW(("cgd_diskstart(%p, %p)\n", dksc, bp)); 394 395 bn = bp->b_rawblkno; 396 397 /* 398 * We attempt to allocate all of our resources up front, so that 399 * we can fail quickly if they are unavailable. 400 */ 401 nbp = getiobuf(cs->sc_tvn, false); 402 if (nbp == NULL) 403 return EAGAIN; 404 405 /* 406 * If we are writing, then we need to encrypt the outgoing 407 * block into a new block of memory. 408 */ 409 newaddr = addr = bp->b_data; 410 if ((bp->b_flags & B_READ) == 0) { 411 newaddr = cgd_getdata(dksc, bp->b_bcount); 412 if (!newaddr) { 413 putiobuf(nbp); 414 return EAGAIN; 415 } 416 cgd_cipher(cs, newaddr, addr, bp->b_bcount, bn, 417 DEV_BSIZE, CGD_CIPHER_ENCRYPT); 418 } 419 420 nbp->b_data = newaddr; 421 nbp->b_flags = bp->b_flags; 422 nbp->b_oflags = bp->b_oflags; 423 nbp->b_cflags = bp->b_cflags; 424 nbp->b_iodone = cgdiodone; 425 nbp->b_proc = bp->b_proc; 426 nbp->b_blkno = bn; 427 nbp->b_bcount = bp->b_bcount; 428 nbp->b_private = bp; 429 430 BIO_COPYPRIO(nbp, bp); 431 432 if ((nbp->b_flags & B_READ) == 0) { 433 vp = nbp->b_vp; 434 mutex_enter(vp->v_interlock); 435 vp->v_numoutput++; 436 mutex_exit(vp->v_interlock); 437 } 438 VOP_STRATEGY(cs->sc_tvn, nbp); 439 440 return 0; 441 } 442 443 static void 444 cgdiodone(struct buf *nbp) 445 { 446 struct buf *obp = nbp->b_private; 447 struct cgd_softc *cs = getcgd_softc(obp->b_dev); 448 struct dk_softc *dksc = &cs->sc_dksc; 449 450 KDASSERT(cs); 451 452 DPRINTF_FOLLOW(("cgdiodone(%p)\n", nbp)); 453 DPRINTF(CGDB_IO, ("cgdiodone: bp %p bcount %d resid %d\n", 454 obp, obp->b_bcount, obp->b_resid)); 455 DPRINTF(CGDB_IO, (" dev 0x%"PRIx64", nbp %p bn %" PRId64 " addr %p bcnt %d\n", 456 nbp->b_dev, nbp, nbp->b_blkno, nbp->b_data, 457 nbp->b_bcount)); 458 if (nbp->b_error != 0) { 459 obp->b_error = nbp->b_error; 460 DPRINTF(CGDB_IO, ("%s: error %d\n", dksc->sc_xname, 461 obp->b_error)); 462 } 463 464 /* Perform the decryption if we are reading. 465 * 466 * Note: use the blocknumber from nbp, since it is what 467 * we used to encrypt the blocks. 468 */ 469 470 if (nbp->b_flags & B_READ) 471 cgd_cipher(cs, obp->b_data, obp->b_data, obp->b_bcount, 472 nbp->b_blkno, DEV_BSIZE, CGD_CIPHER_DECRYPT); 473 474 /* If we allocated memory, free it now... */ 475 if (nbp->b_data != obp->b_data) 476 cgd_putdata(dksc, nbp->b_data); 477 478 putiobuf(nbp); 479 480 /* Request is complete for whatever reason */ 481 obp->b_resid = 0; 482 if (obp->b_error != 0) 483 obp->b_resid = obp->b_bcount; 484 485 dk_done(dksc, obp); 486 dk_start(dksc, NULL); 487 } 488 489 /* XXX: we should probably put these into dksubr.c, mostly */ 490 static int 491 cgdread(dev_t dev, struct uio *uio, int flags) 492 { 493 struct cgd_softc *cs; 494 struct dk_softc *dksc; 495 496 DPRINTF_FOLLOW(("cgdread(0x%llx, %p, %d)\n", 497 (unsigned long long)dev, uio, flags)); 498 GETCGD_SOFTC(cs, dev); 499 dksc = &cs->sc_dksc; 500 if (!DK_ATTACHED(dksc)) 501 return ENXIO; 502 return physio(cgdstrategy, NULL, dev, B_READ, minphys, uio); 503 } 504 505 /* XXX: we should probably put these into dksubr.c, mostly */ 506 static int 507 cgdwrite(dev_t dev, struct uio *uio, int flags) 508 { 509 struct cgd_softc *cs; 510 struct dk_softc *dksc; 511 512 DPRINTF_FOLLOW(("cgdwrite(0x%"PRIx64", %p, %d)\n", dev, uio, flags)); 513 GETCGD_SOFTC(cs, dev); 514 dksc = &cs->sc_dksc; 515 if (!DK_ATTACHED(dksc)) 516 return ENXIO; 517 return physio(cgdstrategy, NULL, dev, B_WRITE, minphys, uio); 518 } 519 520 static int 521 cgdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 522 { 523 struct cgd_softc *cs; 524 struct dk_softc *dksc; 525 int part = DISKPART(dev); 526 int pmask = 1 << part; 527 528 DPRINTF_FOLLOW(("cgdioctl(0x%"PRIx64", %ld, %p, %d, %p)\n", 529 dev, cmd, data, flag, l)); 530 531 switch (cmd) { 532 case CGDIOCGET: 533 return cgd_ioctl_get(dev, data, l); 534 case CGDIOCSET: 535 case CGDIOCCLR: 536 if ((flag & FWRITE) == 0) 537 return EBADF; 538 /* FALLTHROUGH */ 539 default: 540 GETCGD_SOFTC(cs, dev); 541 dksc = &cs->sc_dksc; 542 break; 543 } 544 545 switch (cmd) { 546 case CGDIOCSET: 547 if (DK_ATTACHED(dksc)) 548 return EBUSY; 549 return cgd_ioctl_set(cs, data, l); 550 case CGDIOCCLR: 551 if (DK_BUSY(&cs->sc_dksc, pmask)) 552 return EBUSY; 553 return cgd_ioctl_clr(cs, l); 554 case DIOCCACHESYNC: 555 /* 556 * XXX Do we really need to care about having a writable 557 * file descriptor here? 558 */ 559 if ((flag & FWRITE) == 0) 560 return (EBADF); 561 562 /* 563 * We pass this call down to the underlying disk. 564 */ 565 return VOP_IOCTL(cs->sc_tvn, cmd, data, flag, l->l_cred); 566 case DIOCGSTRATEGY: 567 case DIOCSSTRATEGY: 568 if (!DK_ATTACHED(dksc)) 569 return ENOENT; 570 /*FALLTHROUGH*/ 571 default: 572 return dk_ioctl(dksc, dev, cmd, data, flag, l); 573 case CGDIOCGET: 574 KASSERT(0); 575 return EINVAL; 576 } 577 } 578 579 static int 580 cgddump(dev_t dev, daddr_t blkno, void *va, size_t size) 581 { 582 struct cgd_softc *cs; 583 584 DPRINTF_FOLLOW(("cgddump(0x%"PRIx64", %" PRId64 ", %p, %lu)\n", 585 dev, blkno, va, (unsigned long)size)); 586 GETCGD_SOFTC(cs, dev); 587 return dk_dump(&cs->sc_dksc, dev, blkno, va, size); 588 } 589 590 /* 591 * XXXrcd: 592 * for now we hardcode the maximum key length. 593 */ 594 #define MAX_KEYSIZE 1024 595 596 static const struct { 597 const char *n; 598 int v; 599 int d; 600 } encblkno[] = { 601 { "encblkno", CGD_CIPHER_CBC_ENCBLKNO8, 1 }, 602 { "encblkno8", CGD_CIPHER_CBC_ENCBLKNO8, 1 }, 603 { "encblkno1", CGD_CIPHER_CBC_ENCBLKNO1, 8 }, 604 }; 605 606 /* ARGSUSED */ 607 static int 608 cgd_ioctl_set(struct cgd_softc *cs, void *data, struct lwp *l) 609 { 610 struct cgd_ioctl *ci = data; 611 struct vnode *vp; 612 int ret; 613 size_t i; 614 size_t keybytes; /* key length in bytes */ 615 const char *cp; 616 struct pathbuf *pb; 617 char *inbuf; 618 struct dk_softc *dksc = &cs->sc_dksc; 619 620 cp = ci->ci_disk; 621 622 ret = pathbuf_copyin(ci->ci_disk, &pb); 623 if (ret != 0) { 624 return ret; 625 } 626 ret = dk_lookup(pb, l, &vp); 627 pathbuf_destroy(pb); 628 if (ret != 0) { 629 return ret; 630 } 631 632 inbuf = malloc(MAX_KEYSIZE, M_TEMP, M_WAITOK); 633 634 if ((ret = cgdinit(cs, cp, vp, l)) != 0) 635 goto bail; 636 637 (void)memset(inbuf, 0, MAX_KEYSIZE); 638 ret = copyinstr(ci->ci_alg, inbuf, 256, NULL); 639 if (ret) 640 goto bail; 641 cs->sc_cfuncs = cryptfuncs_find(inbuf); 642 if (!cs->sc_cfuncs) { 643 ret = EINVAL; 644 goto bail; 645 } 646 647 (void)memset(inbuf, 0, MAX_KEYSIZE); 648 ret = copyinstr(ci->ci_ivmethod, inbuf, MAX_KEYSIZE, NULL); 649 if (ret) 650 goto bail; 651 652 for (i = 0; i < __arraycount(encblkno); i++) 653 if (strcmp(encblkno[i].n, inbuf) == 0) 654 break; 655 656 if (i == __arraycount(encblkno)) { 657 ret = EINVAL; 658 goto bail; 659 } 660 661 keybytes = ci->ci_keylen / 8 + 1; 662 if (keybytes > MAX_KEYSIZE) { 663 ret = EINVAL; 664 goto bail; 665 } 666 667 (void)memset(inbuf, 0, MAX_KEYSIZE); 668 ret = copyin(ci->ci_key, inbuf, keybytes); 669 if (ret) 670 goto bail; 671 672 cs->sc_cdata.cf_blocksize = ci->ci_blocksize; 673 cs->sc_cdata.cf_mode = encblkno[i].v; 674 cs->sc_cdata.cf_keylen = ci->ci_keylen; 675 cs->sc_cdata.cf_priv = cs->sc_cfuncs->cf_init(ci->ci_keylen, inbuf, 676 &cs->sc_cdata.cf_blocksize); 677 if (cs->sc_cdata.cf_blocksize > CGD_MAXBLOCKSIZE) { 678 log(LOG_WARNING, "cgd: Disallowed cipher with blocksize %zu > %u\n", 679 cs->sc_cdata.cf_blocksize, CGD_MAXBLOCKSIZE); 680 cs->sc_cdata.cf_priv = NULL; 681 } 682 683 /* 684 * The blocksize is supposed to be in bytes. Unfortunately originally 685 * it was expressed in bits. For compatibility we maintain encblkno 686 * and encblkno8. 687 */ 688 cs->sc_cdata.cf_blocksize /= encblkno[i].d; 689 (void)explicit_memset(inbuf, 0, MAX_KEYSIZE); 690 if (!cs->sc_cdata.cf_priv) { 691 ret = EINVAL; /* XXX is this the right error? */ 692 goto bail; 693 } 694 free(inbuf, M_TEMP); 695 696 bufq_alloc(&dksc->sc_bufq, "fcfs", 0); 697 698 cs->sc_data = malloc(MAXPHYS, M_DEVBUF, M_WAITOK); 699 cs->sc_data_used = 0; 700 701 /* Attach the disk. */ 702 dk_attach(dksc); 703 disk_attach(&dksc->sc_dkdev); 704 705 disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, NULL); 706 707 /* Try and read the disklabel. */ 708 dk_getdisklabel(dksc, 0 /* XXX ? (cause of PR 41704) */); 709 710 /* Discover wedges on this disk. */ 711 dkwedge_discover(&dksc->sc_dkdev); 712 713 return 0; 714 715 bail: 716 free(inbuf, M_TEMP); 717 (void)vn_close(vp, FREAD|FWRITE, l->l_cred); 718 return ret; 719 } 720 721 /* ARGSUSED */ 722 static int 723 cgd_ioctl_clr(struct cgd_softc *cs, struct lwp *l) 724 { 725 struct dk_softc *dksc = &cs->sc_dksc; 726 727 if (!DK_ATTACHED(dksc)) 728 return ENXIO; 729 730 /* Delete all of our wedges. */ 731 dkwedge_delall(&dksc->sc_dkdev); 732 733 /* Kill off any queued buffers. */ 734 dk_drain(dksc); 735 bufq_free(dksc->sc_bufq); 736 737 (void)vn_close(cs->sc_tvn, FREAD|FWRITE, l->l_cred); 738 cs->sc_cfuncs->cf_destroy(cs->sc_cdata.cf_priv); 739 free(cs->sc_tpath, M_DEVBUF); 740 free(cs->sc_data, M_DEVBUF); 741 cs->sc_data_used = 0; 742 dk_detach(dksc); 743 disk_detach(&dksc->sc_dkdev); 744 745 return 0; 746 } 747 748 static int 749 cgd_ioctl_get(dev_t dev, void *data, struct lwp *l) 750 { 751 struct cgd_softc *cs = getcgd_softc(dev); 752 struct cgd_user *cgu; 753 int unit; 754 struct dk_softc *dksc = &cs->sc_dksc; 755 756 unit = CGDUNIT(dev); 757 cgu = (struct cgd_user *)data; 758 759 DPRINTF_FOLLOW(("cgd_ioctl_get(0x%"PRIx64", %d, %p, %p)\n", 760 dev, unit, data, l)); 761 762 if (cgu->cgu_unit == -1) 763 cgu->cgu_unit = unit; 764 765 if (cgu->cgu_unit < 0) 766 return EINVAL; /* XXX: should this be ENXIO? */ 767 768 cs = device_lookup_private(&cgd_cd, unit); 769 if (cs == NULL || !DK_ATTACHED(dksc)) { 770 cgu->cgu_dev = 0; 771 cgu->cgu_alg[0] = '\0'; 772 cgu->cgu_blocksize = 0; 773 cgu->cgu_mode = 0; 774 cgu->cgu_keylen = 0; 775 } 776 else { 777 cgu->cgu_dev = cs->sc_tdev; 778 strlcpy(cgu->cgu_alg, cs->sc_cfuncs->cf_name, 779 sizeof(cgu->cgu_alg)); 780 cgu->cgu_blocksize = cs->sc_cdata.cf_blocksize; 781 cgu->cgu_mode = cs->sc_cdata.cf_mode; 782 cgu->cgu_keylen = cs->sc_cdata.cf_keylen; 783 } 784 return 0; 785 } 786 787 static int 788 cgdinit(struct cgd_softc *cs, const char *cpath, struct vnode *vp, 789 struct lwp *l) 790 { 791 struct disk_geom *dg; 792 int ret; 793 char *tmppath; 794 uint64_t psize; 795 unsigned secsize; 796 struct dk_softc *dksc = &cs->sc_dksc; 797 798 cs->sc_tvn = vp; 799 cs->sc_tpath = NULL; 800 801 tmppath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 802 ret = copyinstr(cpath, tmppath, MAXPATHLEN, &cs->sc_tpathlen); 803 if (ret) 804 goto bail; 805 cs->sc_tpath = malloc(cs->sc_tpathlen, M_DEVBUF, M_WAITOK); 806 memcpy(cs->sc_tpath, tmppath, cs->sc_tpathlen); 807 808 cs->sc_tdev = vp->v_rdev; 809 810 if ((ret = getdisksize(vp, &psize, &secsize)) != 0) 811 goto bail; 812 813 if (psize == 0) { 814 ret = ENODEV; 815 goto bail; 816 } 817 818 /* 819 * XXX here we should probe the underlying device. If we 820 * are accessing a partition of type RAW_PART, then 821 * we should populate our initial geometry with the 822 * geometry that we discover from the device. 823 */ 824 dg = &dksc->sc_dkdev.dk_geom; 825 memset(dg, 0, sizeof(*dg)); 826 dg->dg_secperunit = psize; 827 // XXX: Inherit? 828 dg->dg_secsize = DEV_BSIZE; 829 dg->dg_ntracks = 1; 830 dg->dg_nsectors = 1024 * (1024 / dg->dg_secsize); 831 dg->dg_ncylinders = dg->dg_secperunit / dg->dg_nsectors; 832 833 bail: 834 free(tmppath, M_TEMP); 835 if (ret && cs->sc_tpath) 836 free(cs->sc_tpath, M_DEVBUF); 837 return ret; 838 } 839 840 /* 841 * Our generic cipher entry point. This takes care of the 842 * IV mode and passes off the work to the specific cipher. 843 * We implement here the IV method ``encrypted block 844 * number''. 845 * 846 * For the encryption case, we accomplish this by setting 847 * up a struct uio where the first iovec of the source is 848 * the blocknumber and the first iovec of the dest is a 849 * sink. We then call the cipher with an IV of zero, and 850 * the right thing happens. 851 * 852 * For the decryption case, we use the same basic mechanism 853 * for symmetry, but we encrypt the block number in the 854 * first iovec. 855 * 856 * We mainly do this to avoid requiring the definition of 857 * an ECB mode. 858 * 859 * XXXrcd: for now we rely on our own crypto framework defined 860 * in dev/cgd_crypto.c. This will change when we 861 * get a generic kernel crypto framework. 862 */ 863 864 static void 865 blkno2blkno_buf(char *sbuf, daddr_t blkno) 866 { 867 int i; 868 869 /* Set up the blkno in blkno_buf, here we do not care much 870 * about the final layout of the information as long as we 871 * can guarantee that each sector will have a different IV 872 * and that the endianness of the machine will not affect 873 * the representation that we have chosen. 874 * 875 * We choose this representation, because it does not rely 876 * on the size of buf (which is the blocksize of the cipher), 877 * but allows daddr_t to grow without breaking existing 878 * disks. 879 * 880 * Note that blkno2blkno_buf does not take a size as input, 881 * and hence must be called on a pre-zeroed buffer of length 882 * greater than or equal to sizeof(daddr_t). 883 */ 884 for (i=0; i < sizeof(daddr_t); i++) { 885 *sbuf++ = blkno & 0xff; 886 blkno >>= 8; 887 } 888 } 889 890 static void 891 cgd_cipher(struct cgd_softc *cs, void *dstv, void *srcv, 892 size_t len, daddr_t blkno, size_t secsize, int dir) 893 { 894 char *dst = dstv; 895 char *src = srcv; 896 cfunc_cipher *cipher = cs->sc_cfuncs->cf_cipher; 897 struct uio dstuio; 898 struct uio srcuio; 899 struct iovec dstiov[2]; 900 struct iovec srciov[2]; 901 size_t blocksize = cs->sc_cdata.cf_blocksize; 902 char sink[CGD_MAXBLOCKSIZE]; 903 char zero_iv[CGD_MAXBLOCKSIZE]; 904 char blkno_buf[CGD_MAXBLOCKSIZE]; 905 906 DPRINTF_FOLLOW(("cgd_cipher() dir=%d\n", dir)); 907 908 DIAGCONDPANIC(len % blocksize != 0, 909 ("cgd_cipher: len %% blocksize != 0")); 910 911 /* ensure that sizeof(daddr_t) <= blocksize (for encblkno IVing) */ 912 DIAGCONDPANIC(sizeof(daddr_t) > blocksize, 913 ("cgd_cipher: sizeof(daddr_t) > blocksize")); 914 915 memset(zero_iv, 0x0, blocksize); 916 917 dstuio.uio_iov = dstiov; 918 dstuio.uio_iovcnt = 2; 919 920 srcuio.uio_iov = srciov; 921 srcuio.uio_iovcnt = 2; 922 923 dstiov[0].iov_base = sink; 924 dstiov[0].iov_len = blocksize; 925 srciov[0].iov_base = blkno_buf; 926 srciov[0].iov_len = blocksize; 927 dstiov[1].iov_len = secsize; 928 srciov[1].iov_len = secsize; 929 930 for (; len > 0; len -= secsize) { 931 dstiov[1].iov_base = dst; 932 srciov[1].iov_base = src; 933 934 memset(blkno_buf, 0x0, blocksize); 935 blkno2blkno_buf(blkno_buf, blkno); 936 if (dir == CGD_CIPHER_DECRYPT) { 937 dstuio.uio_iovcnt = 1; 938 srcuio.uio_iovcnt = 1; 939 IFDEBUG(CGDB_CRYPTO, hexprint("step 0: blkno_buf", 940 blkno_buf, blocksize)); 941 cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio, 942 zero_iv, CGD_CIPHER_ENCRYPT); 943 memcpy(blkno_buf, sink, blocksize); 944 dstuio.uio_iovcnt = 2; 945 srcuio.uio_iovcnt = 2; 946 } 947 948 IFDEBUG(CGDB_CRYPTO, hexprint("step 1: blkno_buf", 949 blkno_buf, blocksize)); 950 cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio, zero_iv, dir); 951 IFDEBUG(CGDB_CRYPTO, hexprint("step 2: sink", 952 sink, blocksize)); 953 954 dst += secsize; 955 src += secsize; 956 blkno++; 957 } 958 } 959 960 #ifdef DEBUG 961 static void 962 hexprint(const char *start, void *buf, int len) 963 { 964 char *c = buf; 965 966 DIAGCONDPANIC(len < 0, ("hexprint: called with len < 0")); 967 printf("%s: len=%06d 0x", start, len); 968 while (len--) 969 printf("%02x", (unsigned char) *c++); 970 } 971 #endif 972 973 MODULE(MODULE_CLASS_DRIVER, cgd, "dk_subr"); 974 975 #ifdef _MODULE 976 CFDRIVER_DECL(cgd, DV_DISK, NULL); 977 #endif 978 979 static int 980 cgd_modcmd(modcmd_t cmd, void *arg) 981 { 982 int error = 0; 983 984 #ifdef _MODULE 985 devmajor_t bmajor = -1, cmajor = -1; 986 #endif 987 988 switch (cmd) { 989 case MODULE_CMD_INIT: 990 #ifdef _MODULE 991 error = config_cfdriver_attach(&cgd_cd); 992 if (error) 993 break; 994 995 error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca); 996 if (error) { 997 config_cfdriver_detach(&cgd_cd); 998 aprint_error("%s: unable to register cfattach\n", 999 cgd_cd.cd_name); 1000 break; 1001 } 1002 1003 error = devsw_attach("cgd", &cgd_bdevsw, &bmajor, 1004 &cgd_cdevsw, &cmajor); 1005 if (error) { 1006 config_cfattach_detach(cgd_cd.cd_name, &cgd_ca); 1007 config_cfdriver_detach(&cgd_cd); 1008 break; 1009 } 1010 #endif 1011 break; 1012 1013 case MODULE_CMD_FINI: 1014 #ifdef _MODULE 1015 error = config_cfattach_detach(cgd_cd.cd_name, &cgd_ca); 1016 if (error) 1017 break; 1018 config_cfdriver_detach(&cgd_cd); 1019 devsw_detach(&cgd_bdevsw, &cgd_cdevsw); 1020 #endif 1021 break; 1022 1023 case MODULE_CMD_STAT: 1024 return ENOTTY; 1025 1026 default: 1027 return ENOTTY; 1028 } 1029 1030 return error; 1031 } 1032