1 /* $NetBSD: cgd.c,v 1.82 2013/09/12 12:28:49 martin 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 1.82 2013/09/12 12:28:49 martin 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 /* Entry Point Functions */ 59 60 void cgdattach(int); 61 62 static dev_type_open(cgdopen); 63 static dev_type_close(cgdclose); 64 static dev_type_read(cgdread); 65 static dev_type_write(cgdwrite); 66 static dev_type_ioctl(cgdioctl); 67 static dev_type_strategy(cgdstrategy); 68 static dev_type_dump(cgddump); 69 static dev_type_size(cgdsize); 70 71 const struct bdevsw cgd_bdevsw = { 72 cgdopen, cgdclose, cgdstrategy, cgdioctl, 73 cgddump, cgdsize, D_DISK 74 }; 75 76 const struct cdevsw cgd_cdevsw = { 77 cgdopen, cgdclose, cgdread, cgdwrite, cgdioctl, 78 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 79 }; 80 81 static int cgd_match(device_t, cfdata_t, void *); 82 static void cgd_attach(device_t, device_t, void *); 83 static int cgd_detach(device_t, int); 84 static struct cgd_softc *cgd_spawn(int); 85 static int cgd_destroy(device_t); 86 87 /* Internal Functions */ 88 89 static int cgdstart(struct dk_softc *, struct buf *); 90 static void cgdiodone(struct buf *); 91 92 static int cgd_ioctl_set(struct cgd_softc *, void *, struct lwp *); 93 static int cgd_ioctl_clr(struct cgd_softc *, struct lwp *); 94 static int cgd_ioctl_get(dev_t, void *, struct lwp *); 95 static int cgdinit(struct cgd_softc *, const char *, struct vnode *, 96 struct lwp *); 97 static void cgd_cipher(struct cgd_softc *, void *, void *, 98 size_t, daddr_t, size_t, int); 99 100 /* Pseudo-disk Interface */ 101 102 static struct dk_intf the_dkintf = { 103 DTYPE_CGD, 104 "cgd", 105 cgdopen, 106 cgdclose, 107 cgdstrategy, 108 cgdstart, 109 }; 110 static struct dk_intf *di = &the_dkintf; 111 112 static struct dkdriver cgddkdriver = { 113 .d_strategy = cgdstrategy, 114 .d_minphys = minphys, 115 }; 116 117 CFATTACH_DECL3_NEW(cgd, sizeof(struct cgd_softc), 118 cgd_match, cgd_attach, cgd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 119 extern struct cfdriver cgd_cd; 120 121 /* DIAGNOSTIC and DEBUG definitions */ 122 123 #if defined(CGDDEBUG) && !defined(DEBUG) 124 #define DEBUG 125 #endif 126 127 #ifdef DEBUG 128 int cgddebug = 0; 129 130 #define CGDB_FOLLOW 0x1 131 #define CGDB_IO 0x2 132 #define CGDB_CRYPTO 0x4 133 134 #define IFDEBUG(x,y) if (cgddebug & (x)) y 135 #define DPRINTF(x,y) IFDEBUG(x, printf y) 136 #define DPRINTF_FOLLOW(y) DPRINTF(CGDB_FOLLOW, y) 137 138 static void hexprint(const char *, void *, int); 139 140 #else 141 #define IFDEBUG(x,y) 142 #define DPRINTF(x,y) 143 #define DPRINTF_FOLLOW(y) 144 #endif 145 146 #ifdef DIAGNOSTIC 147 #define DIAGPANIC(x) panic x 148 #define DIAGCONDPANIC(x,y) if (x) panic y 149 #else 150 #define DIAGPANIC(x) 151 #define DIAGCONDPANIC(x,y) 152 #endif 153 154 /* Global variables */ 155 156 /* Utility Functions */ 157 158 #define CGDUNIT(x) DISKUNIT(x) 159 #define GETCGD_SOFTC(_cs, x) if (!((_cs) = getcgd_softc(x))) return ENXIO 160 161 /* The code */ 162 163 static struct cgd_softc * 164 getcgd_softc(dev_t dev) 165 { 166 int unit = CGDUNIT(dev); 167 struct cgd_softc *sc; 168 169 DPRINTF_FOLLOW(("getcgd_softc(0x%"PRIx64"): unit = %d\n", dev, unit)); 170 171 sc = device_lookup_private(&cgd_cd, unit); 172 if (sc == NULL) 173 sc = cgd_spawn(unit); 174 return sc; 175 } 176 177 static int 178 cgd_match(device_t self, cfdata_t cfdata, void *aux) 179 { 180 181 return 1; 182 } 183 184 static void 185 cgd_attach(device_t parent, device_t self, void *aux) 186 { 187 struct cgd_softc *sc = device_private(self); 188 189 simple_lock_init(&sc->sc_slock); 190 dk_sc_init(&sc->sc_dksc, device_xname(self)); 191 sc->sc_dksc.sc_dev = self; 192 disk_init(&sc->sc_dksc.sc_dkdev, sc->sc_dksc.sc_xname, &cgddkdriver); 193 194 if (!pmf_device_register(self, NULL, NULL)) 195 aprint_error_dev(self, "unable to register power management hooks\n"); 196 } 197 198 199 static int 200 cgd_detach(device_t self, int flags) 201 { 202 int ret; 203 const int pmask = 1 << RAW_PART; 204 struct cgd_softc *sc = device_private(self); 205 struct dk_softc *dksc = &sc->sc_dksc; 206 207 if (DK_BUSY(dksc, pmask)) 208 return EBUSY; 209 210 if ((dksc->sc_flags & DKF_INITED) != 0 && 211 (ret = cgd_ioctl_clr(sc, curlwp)) != 0) 212 return ret; 213 214 disk_destroy(&dksc->sc_dkdev); 215 216 return 0; 217 } 218 219 void 220 cgdattach(int num) 221 { 222 int error; 223 224 error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca); 225 if (error != 0) 226 aprint_error("%s: unable to register cfattach\n", 227 cgd_cd.cd_name); 228 } 229 230 static struct cgd_softc * 231 cgd_spawn(int unit) 232 { 233 cfdata_t cf; 234 235 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 236 cf->cf_name = cgd_cd.cd_name; 237 cf->cf_atname = cgd_cd.cd_name; 238 cf->cf_unit = unit; 239 cf->cf_fstate = FSTATE_STAR; 240 241 return device_private(config_attach_pseudo(cf)); 242 } 243 244 static int 245 cgd_destroy(device_t dev) 246 { 247 int error; 248 cfdata_t cf; 249 250 cf = device_cfdata(dev); 251 error = config_detach(dev, DETACH_QUIET); 252 if (error) 253 return error; 254 free(cf, M_DEVBUF); 255 return 0; 256 } 257 258 static int 259 cgdopen(dev_t dev, int flags, int fmt, struct lwp *l) 260 { 261 struct cgd_softc *cs; 262 263 DPRINTF_FOLLOW(("cgdopen(0x%"PRIx64", %d)\n", dev, flags)); 264 GETCGD_SOFTC(cs, dev); 265 return dk_open(di, &cs->sc_dksc, dev, flags, fmt, l); 266 } 267 268 static int 269 cgdclose(dev_t dev, int flags, int fmt, struct lwp *l) 270 { 271 int error; 272 struct cgd_softc *cs; 273 struct dk_softc *dksc; 274 275 DPRINTF_FOLLOW(("cgdclose(0x%"PRIx64", %d)\n", dev, flags)); 276 GETCGD_SOFTC(cs, dev); 277 dksc = &cs->sc_dksc; 278 if ((error = dk_close(di, dksc, dev, flags, fmt, l)) != 0) 279 return error; 280 281 if ((dksc->sc_flags & DKF_INITED) == 0) { 282 if ((error = cgd_destroy(cs->sc_dksc.sc_dev)) != 0) { 283 aprint_error_dev(dksc->sc_dev, 284 "unable to detach instance\n"); 285 return error; 286 } 287 } 288 return 0; 289 } 290 291 static void 292 cgdstrategy(struct buf *bp) 293 { 294 struct cgd_softc *cs = getcgd_softc(bp->b_dev); 295 296 DPRINTF_FOLLOW(("cgdstrategy(%p): b_bcount = %ld\n", bp, 297 (long)bp->b_bcount)); 298 299 /* 300 * Reject unaligned writes. We can encrypt and decrypt only 301 * complete disk sectors, and we let the ciphers require their 302 * buffers to be aligned to 32-bit boundaries. 303 */ 304 if (bp->b_blkno < 0 || 305 (bp->b_bcount % DEV_BSIZE) != 0 || 306 ((uintptr_t)bp->b_data & 3) != 0) { 307 bp->b_error = EINVAL; 308 bp->b_resid = bp->b_bcount; 309 biodone(bp); 310 return; 311 } 312 313 /* XXXrcd: Should we test for (cs != NULL)? */ 314 dk_strategy(di, &cs->sc_dksc, bp); 315 return; 316 } 317 318 static int 319 cgdsize(dev_t dev) 320 { 321 struct cgd_softc *cs = getcgd_softc(dev); 322 323 DPRINTF_FOLLOW(("cgdsize(0x%"PRIx64")\n", dev)); 324 if (!cs) 325 return -1; 326 return dk_size(di, &cs->sc_dksc, dev); 327 } 328 329 /* 330 * cgd_{get,put}data are functions that deal with getting a buffer 331 * for the new encrypted data. We have a buffer per device so that 332 * we can ensure that we can always have a transaction in flight. 333 * We use this buffer first so that we have one less piece of 334 * malloc'ed data at any given point. 335 */ 336 337 static void * 338 cgd_getdata(struct dk_softc *dksc, unsigned long size) 339 { 340 struct cgd_softc *cs = (struct cgd_softc *)dksc; 341 void * data = NULL; 342 343 simple_lock(&cs->sc_slock); 344 if (cs->sc_data_used == 0) { 345 cs->sc_data_used = 1; 346 data = cs->sc_data; 347 } 348 simple_unlock(&cs->sc_slock); 349 350 if (data) 351 return data; 352 353 return malloc(size, M_DEVBUF, M_NOWAIT); 354 } 355 356 static void 357 cgd_putdata(struct dk_softc *dksc, void *data) 358 { 359 struct cgd_softc *cs = (struct cgd_softc *)dksc; 360 361 if (data == cs->sc_data) { 362 simple_lock(&cs->sc_slock); 363 cs->sc_data_used = 0; 364 simple_unlock(&cs->sc_slock); 365 } else { 366 free(data, M_DEVBUF); 367 } 368 } 369 370 static int 371 cgdstart(struct dk_softc *dksc, struct buf *bp) 372 { 373 struct cgd_softc *cs = (struct cgd_softc *)dksc; 374 struct buf *nbp; 375 void * addr; 376 void * newaddr; 377 daddr_t bn; 378 struct vnode *vp; 379 380 DPRINTF_FOLLOW(("cgdstart(%p, %p)\n", dksc, bp)); 381 disk_busy(&dksc->sc_dkdev); /* XXX: put in dksubr.c */ 382 383 bn = bp->b_rawblkno; 384 385 /* 386 * We attempt to allocate all of our resources up front, so that 387 * we can fail quickly if they are unavailable. 388 */ 389 390 nbp = getiobuf(cs->sc_tvn, false); 391 if (nbp == NULL) { 392 disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ)); 393 return -1; 394 } 395 396 /* 397 * If we are writing, then we need to encrypt the outgoing 398 * block into a new block of memory. If we fail, then we 399 * return an error and let the dksubr framework deal with it. 400 */ 401 newaddr = addr = bp->b_data; 402 if ((bp->b_flags & B_READ) == 0) { 403 newaddr = cgd_getdata(dksc, bp->b_bcount); 404 if (!newaddr) { 405 putiobuf(nbp); 406 disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ)); 407 return -1; 408 } 409 cgd_cipher(cs, newaddr, addr, bp->b_bcount, bn, 410 DEV_BSIZE, CGD_CIPHER_ENCRYPT); 411 } 412 413 nbp->b_data = newaddr; 414 nbp->b_flags = bp->b_flags; 415 nbp->b_oflags = bp->b_oflags; 416 nbp->b_cflags = bp->b_cflags; 417 nbp->b_iodone = cgdiodone; 418 nbp->b_proc = bp->b_proc; 419 nbp->b_blkno = bn; 420 nbp->b_bcount = bp->b_bcount; 421 nbp->b_private = bp; 422 423 BIO_COPYPRIO(nbp, bp); 424 425 if ((nbp->b_flags & B_READ) == 0) { 426 vp = nbp->b_vp; 427 mutex_enter(vp->v_interlock); 428 vp->v_numoutput++; 429 mutex_exit(vp->v_interlock); 430 } 431 VOP_STRATEGY(cs->sc_tvn, nbp); 432 return 0; 433 } 434 435 static void 436 cgdiodone(struct buf *nbp) 437 { 438 struct buf *obp = nbp->b_private; 439 struct cgd_softc *cs = getcgd_softc(obp->b_dev); 440 struct dk_softc *dksc = &cs->sc_dksc; 441 int s; 442 443 KDASSERT(cs); 444 445 DPRINTF_FOLLOW(("cgdiodone(%p)\n", nbp)); 446 DPRINTF(CGDB_IO, ("cgdiodone: bp %p bcount %d resid %d\n", 447 obp, obp->b_bcount, obp->b_resid)); 448 DPRINTF(CGDB_IO, (" dev 0x%"PRIx64", nbp %p bn %" PRId64 " addr %p bcnt %d\n", 449 nbp->b_dev, nbp, nbp->b_blkno, nbp->b_data, 450 nbp->b_bcount)); 451 if (nbp->b_error != 0) { 452 obp->b_error = nbp->b_error; 453 DPRINTF(CGDB_IO, ("%s: error %d\n", dksc->sc_xname, 454 obp->b_error)); 455 } 456 457 /* Perform the decryption if we are reading. 458 * 459 * Note: use the blocknumber from nbp, since it is what 460 * we used to encrypt the blocks. 461 */ 462 463 if (nbp->b_flags & B_READ) 464 cgd_cipher(cs, obp->b_data, obp->b_data, obp->b_bcount, 465 nbp->b_blkno, DEV_BSIZE, CGD_CIPHER_DECRYPT); 466 467 /* If we allocated memory, free it now... */ 468 if (nbp->b_data != obp->b_data) 469 cgd_putdata(dksc, nbp->b_data); 470 471 putiobuf(nbp); 472 473 /* Request is complete for whatever reason */ 474 obp->b_resid = 0; 475 if (obp->b_error != 0) 476 obp->b_resid = obp->b_bcount; 477 s = splbio(); 478 disk_unbusy(&dksc->sc_dkdev, obp->b_bcount - obp->b_resid, 479 (obp->b_flags & B_READ)); 480 biodone(obp); 481 dk_iodone(di, dksc); 482 splx(s); 483 } 484 485 /* XXX: we should probably put these into dksubr.c, mostly */ 486 static int 487 cgdread(dev_t dev, struct uio *uio, int flags) 488 { 489 struct cgd_softc *cs; 490 struct dk_softc *dksc; 491 492 DPRINTF_FOLLOW(("cgdread(0x%llx, %p, %d)\n", 493 (unsigned long long)dev, uio, flags)); 494 GETCGD_SOFTC(cs, dev); 495 dksc = &cs->sc_dksc; 496 if ((dksc->sc_flags & DKF_INITED) == 0) 497 return ENXIO; 498 return physio(cgdstrategy, NULL, dev, B_READ, minphys, uio); 499 } 500 501 /* XXX: we should probably put these into dksubr.c, mostly */ 502 static int 503 cgdwrite(dev_t dev, struct uio *uio, int flags) 504 { 505 struct cgd_softc *cs; 506 struct dk_softc *dksc; 507 508 DPRINTF_FOLLOW(("cgdwrite(0x%"PRIx64", %p, %d)\n", dev, uio, flags)); 509 GETCGD_SOFTC(cs, dev); 510 dksc = &cs->sc_dksc; 511 if ((dksc->sc_flags & DKF_INITED) == 0) 512 return ENXIO; 513 return physio(cgdstrategy, NULL, dev, B_WRITE, minphys, uio); 514 } 515 516 static int 517 cgdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 518 { 519 struct cgd_softc *cs; 520 struct dk_softc *dksc; 521 int part = DISKPART(dev); 522 int pmask = 1 << part; 523 524 DPRINTF_FOLLOW(("cgdioctl(0x%"PRIx64", %ld, %p, %d, %p)\n", 525 dev, cmd, data, flag, l)); 526 527 switch (cmd) { 528 case CGDIOCGET: /* don't call cgd_spawn() if the device isn't there */ 529 cs = NULL; 530 dksc = NULL; 531 break; 532 case CGDIOCSET: 533 case CGDIOCCLR: 534 if ((flag & FWRITE) == 0) 535 return EBADF; 536 /* FALLTHROUGH */ 537 default: 538 GETCGD_SOFTC(cs, dev); 539 dksc = &cs->sc_dksc; 540 break; 541 } 542 543 switch (cmd) { 544 case CGDIOCSET: 545 if (dksc->sc_flags & DKF_INITED) 546 return EBUSY; 547 return cgd_ioctl_set(cs, data, l); 548 case CGDIOCCLR: 549 if (DK_BUSY(&cs->sc_dksc, pmask)) 550 return EBUSY; 551 return cgd_ioctl_clr(cs, l); 552 case CGDIOCGET: 553 return cgd_ioctl_get(dev, data, 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 default: 567 return dk_ioctl(di, dksc, dev, cmd, data, flag, l); 568 } 569 } 570 571 static int 572 cgddump(dev_t dev, daddr_t blkno, void *va, size_t size) 573 { 574 struct cgd_softc *cs; 575 576 DPRINTF_FOLLOW(("cgddump(0x%"PRIx64", %" PRId64 ", %p, %lu)\n", 577 dev, blkno, va, (unsigned long)size)); 578 GETCGD_SOFTC(cs, dev); 579 return dk_dump(di, &cs->sc_dksc, dev, blkno, va, size); 580 } 581 582 /* 583 * XXXrcd: 584 * for now we hardcode the maximum key length. 585 */ 586 #define MAX_KEYSIZE 1024 587 588 static const struct { 589 const char *n; 590 int v; 591 int d; 592 } encblkno[] = { 593 { "encblkno", CGD_CIPHER_CBC_ENCBLKNO8, 1 }, 594 { "encblkno8", CGD_CIPHER_CBC_ENCBLKNO8, 1 }, 595 { "encblkno1", CGD_CIPHER_CBC_ENCBLKNO1, 8 }, 596 }; 597 598 /* ARGSUSED */ 599 static int 600 cgd_ioctl_set(struct cgd_softc *cs, void *data, struct lwp *l) 601 { 602 struct cgd_ioctl *ci = data; 603 struct vnode *vp; 604 int ret; 605 size_t i; 606 size_t keybytes; /* key length in bytes */ 607 const char *cp; 608 struct pathbuf *pb; 609 char *inbuf; 610 struct dk_softc *dksc = &cs->sc_dksc; 611 612 cp = ci->ci_disk; 613 614 ret = pathbuf_copyin(ci->ci_disk, &pb); 615 if (ret != 0) { 616 return ret; 617 } 618 ret = dk_lookup(pb, l, &vp); 619 pathbuf_destroy(pb); 620 if (ret != 0) { 621 return ret; 622 } 623 624 inbuf = malloc(MAX_KEYSIZE, M_TEMP, M_WAITOK); 625 626 if ((ret = cgdinit(cs, cp, vp, l)) != 0) 627 goto bail; 628 629 (void)memset(inbuf, 0, MAX_KEYSIZE); 630 ret = copyinstr(ci->ci_alg, inbuf, 256, NULL); 631 if (ret) 632 goto bail; 633 cs->sc_cfuncs = cryptfuncs_find(inbuf); 634 if (!cs->sc_cfuncs) { 635 ret = EINVAL; 636 goto bail; 637 } 638 639 (void)memset(inbuf, 0, MAX_KEYSIZE); 640 ret = copyinstr(ci->ci_ivmethod, inbuf, MAX_KEYSIZE, NULL); 641 if (ret) 642 goto bail; 643 644 for (i = 0; i < __arraycount(encblkno); i++) 645 if (strcmp(encblkno[i].n, inbuf) == 0) 646 break; 647 648 if (i == __arraycount(encblkno)) { 649 ret = EINVAL; 650 goto bail; 651 } 652 653 keybytes = ci->ci_keylen / 8 + 1; 654 if (keybytes > MAX_KEYSIZE) { 655 ret = EINVAL; 656 goto bail; 657 } 658 659 (void)memset(inbuf, 0, MAX_KEYSIZE); 660 ret = copyin(ci->ci_key, inbuf, keybytes); 661 if (ret) 662 goto bail; 663 664 cs->sc_cdata.cf_blocksize = ci->ci_blocksize; 665 cs->sc_cdata.cf_mode = encblkno[i].v; 666 cs->sc_cdata.cf_keylen = ci->ci_keylen; 667 cs->sc_cdata.cf_priv = cs->sc_cfuncs->cf_init(ci->ci_keylen, inbuf, 668 &cs->sc_cdata.cf_blocksize); 669 if (cs->sc_cdata.cf_blocksize > CGD_MAXBLOCKSIZE) { 670 log(LOG_WARNING, "cgd: Disallowed cipher with blocksize %zu > %u\n", 671 cs->sc_cdata.cf_blocksize, CGD_MAXBLOCKSIZE); 672 cs->sc_cdata.cf_priv = NULL; 673 } 674 675 /* 676 * The blocksize is supposed to be in bytes. Unfortunately originally 677 * it was expressed in bits. For compatibility we maintain encblkno 678 * and encblkno8. 679 */ 680 cs->sc_cdata.cf_blocksize /= encblkno[i].d; 681 (void)memset(inbuf, 0, MAX_KEYSIZE); 682 if (!cs->sc_cdata.cf_priv) { 683 ret = EINVAL; /* XXX is this the right error? */ 684 goto bail; 685 } 686 free(inbuf, M_TEMP); 687 688 bufq_alloc(&dksc->sc_bufq, "fcfs", 0); 689 690 cs->sc_data = malloc(MAXPHYS, M_DEVBUF, M_WAITOK); 691 cs->sc_data_used = 0; 692 693 dksc->sc_flags |= DKF_INITED; 694 695 disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, NULL); 696 697 /* Attach the disk. */ 698 disk_attach(&dksc->sc_dkdev); 699 700 /* Try and read the disklabel. */ 701 dk_getdisklabel(di, dksc, 0 /* XXX ? (cause of PR 41704) */); 702 703 /* Discover wedges on this disk. */ 704 dkwedge_discover(&dksc->sc_dkdev); 705 706 return 0; 707 708 bail: 709 free(inbuf, M_TEMP); 710 (void)vn_close(vp, FREAD|FWRITE, l->l_cred); 711 return ret; 712 } 713 714 /* ARGSUSED */ 715 static int 716 cgd_ioctl_clr(struct cgd_softc *cs, struct lwp *l) 717 { 718 int s; 719 struct dk_softc *dksc = &cs->sc_dksc; 720 721 if ((dksc->sc_flags & DKF_INITED) == 0) 722 return ENXIO; 723 724 /* Delete all of our wedges. */ 725 dkwedge_delall(&dksc->sc_dkdev); 726 727 /* Kill off any queued buffers. */ 728 s = splbio(); 729 bufq_drain(dksc->sc_bufq); 730 splx(s); 731 bufq_free(dksc->sc_bufq); 732 733 (void)vn_close(cs->sc_tvn, FREAD|FWRITE, l->l_cred); 734 cs->sc_cfuncs->cf_destroy(cs->sc_cdata.cf_priv); 735 free(cs->sc_tpath, M_DEVBUF); 736 free(cs->sc_data, M_DEVBUF); 737 cs->sc_data_used = 0; 738 dksc->sc_flags &= ~DKF_INITED; 739 disk_detach(&dksc->sc_dkdev); 740 741 return 0; 742 } 743 744 static int 745 cgd_ioctl_get(dev_t dev, void *data, struct lwp *l) 746 { 747 struct cgd_softc *cs = getcgd_softc(dev); 748 struct cgd_user *cgu; 749 int unit; 750 struct dk_softc *dksc = &cs->sc_dksc; 751 752 unit = CGDUNIT(dev); 753 cgu = (struct cgd_user *)data; 754 755 DPRINTF_FOLLOW(("cgd_ioctl_get(0x%"PRIx64", %d, %p, %p)\n", 756 dev, unit, data, l)); 757 758 if (cgu->cgu_unit == -1) 759 cgu->cgu_unit = unit; 760 761 if (cgu->cgu_unit < 0) 762 return EINVAL; /* XXX: should this be ENXIO? */ 763 764 cs = device_lookup_private(&cgd_cd, unit); 765 if (cs == NULL || (dksc->sc_flags & DKF_INITED) == 0) { 766 cgu->cgu_dev = 0; 767 cgu->cgu_alg[0] = '\0'; 768 cgu->cgu_blocksize = 0; 769 cgu->cgu_mode = 0; 770 cgu->cgu_keylen = 0; 771 } 772 else { 773 cgu->cgu_dev = cs->sc_tdev; 774 strlcpy(cgu->cgu_alg, cs->sc_cfuncs->cf_name, 775 sizeof(cgu->cgu_alg)); 776 cgu->cgu_blocksize = cs->sc_cdata.cf_blocksize; 777 cgu->cgu_mode = cs->sc_cdata.cf_mode; 778 cgu->cgu_keylen = cs->sc_cdata.cf_keylen; 779 } 780 return 0; 781 } 782 783 static int 784 cgdinit(struct cgd_softc *cs, const char *cpath, struct vnode *vp, 785 struct lwp *l) 786 { 787 struct disk_geom *dg; 788 struct vattr va; 789 int ret; 790 char *tmppath; 791 uint64_t psize; 792 unsigned secsize; 793 struct dk_softc *dksc = &cs->sc_dksc; 794 795 cs->sc_tvn = vp; 796 cs->sc_tpath = NULL; 797 798 tmppath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 799 ret = copyinstr(cpath, tmppath, MAXPATHLEN, &cs->sc_tpathlen); 800 if (ret) 801 goto bail; 802 cs->sc_tpath = malloc(cs->sc_tpathlen, M_DEVBUF, M_WAITOK); 803 memcpy(cs->sc_tpath, tmppath, cs->sc_tpathlen); 804 805 vn_lock(vp, LK_SHARED | LK_RETRY); 806 ret = VOP_GETATTR(vp, &va, l->l_cred); 807 VOP_UNLOCK(vp); 808 if (ret != 0) 809 goto bail; 810 811 cs->sc_tdev = va.va_rdev; 812 813 if ((ret = getdisksize(vp, &psize, &secsize)) != 0) 814 goto bail; 815 816 if (psize == 0) { 817 ret = ENODEV; 818 goto bail; 819 } 820 821 /* 822 * XXX here we should probe the underlying device. If we 823 * are accessing a partition of type RAW_PART, then 824 * we should populate our initial geometry with the 825 * geometry that we discover from the device. 826 */ 827 dg = &dksc->sc_dkdev.dk_geom; 828 memset(dg, 0, sizeof(*dg)); 829 dg->dg_secperunit = psize; 830 // XXX: Inherit? 831 dg->dg_secsize = DEV_BSIZE; 832 dg->dg_ntracks = 1; 833 dg->dg_nsectors = 1024 * (1024 / dg->dg_secsize); 834 dg->dg_ncylinders = dg->dg_secperunit / dg->dg_nsectors; 835 836 bail: 837 free(tmppath, M_TEMP); 838 if (ret && cs->sc_tpath) 839 free(cs->sc_tpath, M_DEVBUF); 840 return ret; 841 } 842 843 /* 844 * Our generic cipher entry point. This takes care of the 845 * IV mode and passes off the work to the specific cipher. 846 * We implement here the IV method ``encrypted block 847 * number''. 848 * 849 * For the encryption case, we accomplish this by setting 850 * up a struct uio where the first iovec of the source is 851 * the blocknumber and the first iovec of the dest is a 852 * sink. We then call the cipher with an IV of zero, and 853 * the right thing happens. 854 * 855 * For the decryption case, we use the same basic mechanism 856 * for symmetry, but we encrypt the block number in the 857 * first iovec. 858 * 859 * We mainly do this to avoid requiring the definition of 860 * an ECB mode. 861 * 862 * XXXrcd: for now we rely on our own crypto framework defined 863 * in dev/cgd_crypto.c. This will change when we 864 * get a generic kernel crypto framework. 865 */ 866 867 static void 868 blkno2blkno_buf(char *sbuf, daddr_t blkno) 869 { 870 int i; 871 872 /* Set up the blkno in blkno_buf, here we do not care much 873 * about the final layout of the information as long as we 874 * can guarantee that each sector will have a different IV 875 * and that the endianness of the machine will not affect 876 * the representation that we have chosen. 877 * 878 * We choose this representation, because it does not rely 879 * on the size of buf (which is the blocksize of the cipher), 880 * but allows daddr_t to grow without breaking existing 881 * disks. 882 * 883 * Note that blkno2blkno_buf does not take a size as input, 884 * and hence must be called on a pre-zeroed buffer of length 885 * greater than or equal to sizeof(daddr_t). 886 */ 887 for (i=0; i < sizeof(daddr_t); i++) { 888 *sbuf++ = blkno & 0xff; 889 blkno >>= 8; 890 } 891 } 892 893 static void 894 cgd_cipher(struct cgd_softc *cs, void *dstv, void *srcv, 895 size_t len, daddr_t blkno, size_t secsize, int dir) 896 { 897 char *dst = dstv; 898 char *src = srcv; 899 cfunc_cipher *cipher = cs->sc_cfuncs->cf_cipher; 900 struct uio dstuio; 901 struct uio srcuio; 902 struct iovec dstiov[2]; 903 struct iovec srciov[2]; 904 size_t blocksize = cs->sc_cdata.cf_blocksize; 905 char sink[CGD_MAXBLOCKSIZE]; 906 char zero_iv[CGD_MAXBLOCKSIZE]; 907 char blkno_buf[CGD_MAXBLOCKSIZE]; 908 909 DPRINTF_FOLLOW(("cgd_cipher() dir=%d\n", dir)); 910 911 DIAGCONDPANIC(len % blocksize != 0, 912 ("cgd_cipher: len %% blocksize != 0")); 913 914 /* ensure that sizeof(daddr_t) <= blocksize (for encblkno IVing) */ 915 DIAGCONDPANIC(sizeof(daddr_t) > blocksize, 916 ("cgd_cipher: sizeof(daddr_t) > blocksize")); 917 918 memset(zero_iv, 0x0, blocksize); 919 920 dstuio.uio_iov = dstiov; 921 dstuio.uio_iovcnt = 2; 922 923 srcuio.uio_iov = srciov; 924 srcuio.uio_iovcnt = 2; 925 926 dstiov[0].iov_base = sink; 927 dstiov[0].iov_len = blocksize; 928 srciov[0].iov_base = blkno_buf; 929 srciov[0].iov_len = blocksize; 930 dstiov[1].iov_len = secsize; 931 srciov[1].iov_len = secsize; 932 933 for (; len > 0; len -= secsize) { 934 dstiov[1].iov_base = dst; 935 srciov[1].iov_base = src; 936 937 memset(blkno_buf, 0x0, blocksize); 938 blkno2blkno_buf(blkno_buf, blkno); 939 if (dir == CGD_CIPHER_DECRYPT) { 940 dstuio.uio_iovcnt = 1; 941 srcuio.uio_iovcnt = 1; 942 IFDEBUG(CGDB_CRYPTO, hexprint("step 0: blkno_buf", 943 blkno_buf, blocksize)); 944 cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio, 945 zero_iv, CGD_CIPHER_ENCRYPT); 946 memcpy(blkno_buf, sink, blocksize); 947 dstuio.uio_iovcnt = 2; 948 srcuio.uio_iovcnt = 2; 949 } 950 951 IFDEBUG(CGDB_CRYPTO, hexprint("step 1: blkno_buf", 952 blkno_buf, blocksize)); 953 cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio, zero_iv, dir); 954 IFDEBUG(CGDB_CRYPTO, hexprint("step 2: sink", 955 sink, blocksize)); 956 957 dst += secsize; 958 src += secsize; 959 blkno++; 960 } 961 } 962 963 #ifdef DEBUG 964 static void 965 hexprint(const char *start, void *buf, int len) 966 { 967 char *c = buf; 968 969 DIAGCONDPANIC(len < 0, ("hexprint: called with len < 0")); 970 printf("%s: len=%06d 0x", start, len); 971 while (len--) 972 printf("%02x", (unsigned char) *c++); 973 } 974 #endif 975 976 MODULE(MODULE_CLASS_DRIVER, cgd, NULL); 977 978 #ifdef _MODULE 979 CFDRIVER_DECL(cgd, DV_DISK, NULL); 980 #endif 981 982 static int 983 cgd_modcmd(modcmd_t cmd, void *arg) 984 { 985 int error = 0; 986 987 #ifdef _MODULE 988 int bmajor = -1, cmajor = -1; 989 #endif 990 991 switch (cmd) { 992 case MODULE_CMD_INIT: 993 #ifdef _MODULE 994 error = config_cfdriver_attach(&cgd_cd); 995 if (error) 996 break; 997 998 error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca); 999 if (error) { 1000 config_cfdriver_detach(&cgd_cd); 1001 aprint_error("%s: unable to register cfattach\n", 1002 cgd_cd.cd_name); 1003 break; 1004 } 1005 1006 error = devsw_attach("cgd", &cgd_bdevsw, &bmajor, 1007 &cgd_cdevsw, &cmajor); 1008 if (error) { 1009 config_cfattach_detach(cgd_cd.cd_name, &cgd_ca); 1010 config_cfdriver_detach(&cgd_cd); 1011 break; 1012 } 1013 #endif 1014 break; 1015 1016 case MODULE_CMD_FINI: 1017 #ifdef _MODULE 1018 error = config_cfattach_detach(cgd_cd.cd_name, &cgd_ca); 1019 if (error) 1020 break; 1021 config_cfdriver_detach(&cgd_cd); 1022 devsw_detach(&cgd_bdevsw, &cgd_cdevsw); 1023 #endif 1024 break; 1025 1026 case MODULE_CMD_STAT: 1027 return ENOTTY; 1028 1029 default: 1030 return ENOTTY; 1031 } 1032 1033 return error; 1034 } 1035