Annotation of src/sys/dev/cgd.c, Revision 1.91
1.91 ! justin 1: /* $NetBSD: cgd.c,v 1.90 2014/07/25 08:10:35 dholland Exp $ */
1.1 elric 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>
1.91 ! justin 33: __KERNEL_RCSID(0, "$NetBSD: cgd.c,v 1.90 2014/07/25 08:10:35 dholland Exp $");
1.1 elric 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>
1.21 yamt 41: #include <sys/bufq.h>
1.1 elric 42: #include <sys/malloc.h>
1.74 jruoho 43: #include <sys/module.h>
1.1 elric 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>
1.71 dholland 50: #include <sys/namei.h> /* for pathbuf */
1.1 elric 51: #include <sys/vnode.h>
52: #include <sys/conf.h>
1.62 christos 53: #include <sys/syslog.h>
1.1 elric 54:
55: #include <dev/dkvar.h>
56: #include <dev/cgdvar.h>
57:
1.88 hannken 58: #include <miscfs/specfs/specdev.h> /* for v_rdev */
59:
1.1 elric 60: /* Entry Point Functions */
61:
62: void cgdattach(int);
63:
1.18 thorpej 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);
1.1 elric 72:
73: const struct bdevsw cgd_bdevsw = {
1.84 dholland 74: .d_open = cgdopen,
75: .d_close = cgdclose,
76: .d_strategy = cgdstrategy,
77: .d_ioctl = cgdioctl,
78: .d_dump = cgddump,
79: .d_psize = cgdsize,
1.89 dholland 80: .d_discard = nodiscard,
1.84 dholland 81: .d_flag = D_DISK
1.1 elric 82: };
83:
84: const struct cdevsw cgd_cdevsw = {
1.84 dholland 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,
1.90 dholland 95: .d_discard = nodiscard,
1.84 dholland 96: .d_flag = D_DISK
1.1 elric 97: };
98:
1.65 dyoung 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:
1.1 elric 105: /* Internal Functions */
106:
1.87 bouyer 107: static void cgdstart(struct dk_softc *);
1.1 elric 108: static void cgdiodone(struct buf *);
109:
1.32 christos 110: static int cgd_ioctl_set(struct cgd_softc *, void *, struct lwp *);
1.65 dyoung 111: static int cgd_ioctl_clr(struct cgd_softc *, struct lwp *);
1.78 christos 112: static int cgd_ioctl_get(dev_t, void *, struct lwp *);
1.27 drochner 113: static int cgdinit(struct cgd_softc *, const char *, struct vnode *,
1.32 christos 114: struct lwp *);
1.44 christos 115: static void cgd_cipher(struct cgd_softc *, void *, void *,
1.1 elric 116: size_t, daddr_t, size_t, int);
117:
118: /* Pseudo-disk Interface */
119:
120: static struct dk_intf the_dkintf = {
121: DTYPE_CGD,
122: "cgd",
123: cgdopen,
124: cgdclose,
125: cgdstrategy,
126: cgdstart,
127: };
128: static struct dk_intf *di = &the_dkintf;
129:
1.29 yamt 130: static struct dkdriver cgddkdriver = {
131: .d_strategy = cgdstrategy,
132: .d_minphys = minphys,
133: };
134:
1.65 dyoung 135: CFATTACH_DECL3_NEW(cgd, sizeof(struct cgd_softc),
136: cgd_match, cgd_attach, cgd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN);
137: extern struct cfdriver cgd_cd;
138:
1.1 elric 139: /* DIAGNOSTIC and DEBUG definitions */
140:
141: #if defined(CGDDEBUG) && !defined(DEBUG)
142: #define DEBUG
143: #endif
144:
145: #ifdef DEBUG
146: int cgddebug = 0;
147:
148: #define CGDB_FOLLOW 0x1
149: #define CGDB_IO 0x2
150: #define CGDB_CRYPTO 0x4
151:
152: #define IFDEBUG(x,y) if (cgddebug & (x)) y
153: #define DPRINTF(x,y) IFDEBUG(x, printf y)
154: #define DPRINTF_FOLLOW(y) DPRINTF(CGDB_FOLLOW, y)
155:
1.26 drochner 156: static void hexprint(const char *, void *, int);
1.1 elric 157:
158: #else
159: #define IFDEBUG(x,y)
160: #define DPRINTF(x,y)
161: #define DPRINTF_FOLLOW(y)
162: #endif
163:
164: #ifdef DIAGNOSTIC
1.22 perry 165: #define DIAGPANIC(x) panic x
1.1 elric 166: #define DIAGCONDPANIC(x,y) if (x) panic y
167: #else
168: #define DIAGPANIC(x)
169: #define DIAGCONDPANIC(x,y)
170: #endif
171:
172: /* Global variables */
173:
174: /* Utility Functions */
175:
176: #define CGDUNIT(x) DISKUNIT(x)
177: #define GETCGD_SOFTC(_cs, x) if (!((_cs) = getcgd_softc(x))) return ENXIO
178:
1.65 dyoung 179: /* The code */
180:
1.1 elric 181: static struct cgd_softc *
182: getcgd_softc(dev_t dev)
183: {
184: int unit = CGDUNIT(dev);
1.65 dyoung 185: struct cgd_softc *sc;
1.1 elric 186:
1.56 cegger 187: DPRINTF_FOLLOW(("getcgd_softc(0x%"PRIx64"): unit = %d\n", dev, unit));
1.65 dyoung 188:
189: sc = device_lookup_private(&cgd_cd, unit);
190: if (sc == NULL)
191: sc = cgd_spawn(unit);
192: return sc;
1.1 elric 193: }
194:
1.65 dyoung 195: static int
196: cgd_match(device_t self, cfdata_t cfdata, void *aux)
197: {
198:
199: return 1;
200: }
1.1 elric 201:
202: static void
1.65 dyoung 203: cgd_attach(device_t parent, device_t self, void *aux)
1.1 elric 204: {
1.65 dyoung 205: struct cgd_softc *sc = device_private(self);
1.1 elric 206:
1.85 skrll 207: mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_BIO);
1.77 elric 208: dk_sc_init(&sc->sc_dksc, device_xname(self));
209: sc->sc_dksc.sc_dev = self;
1.65 dyoung 210: disk_init(&sc->sc_dksc.sc_dkdev, sc->sc_dksc.sc_xname, &cgddkdriver);
1.70 joerg 211:
212: if (!pmf_device_register(self, NULL, NULL))
213: aprint_error_dev(self, "unable to register power management hooks\n");
1.65 dyoung 214: }
215:
216:
217: static int
218: cgd_detach(device_t self, int flags)
219: {
1.67 dyoung 220: int ret;
221: const int pmask = 1 << RAW_PART;
1.65 dyoung 222: struct cgd_softc *sc = device_private(self);
1.67 dyoung 223: struct dk_softc *dksc = &sc->sc_dksc;
224:
225: if (DK_BUSY(dksc, pmask))
226: return EBUSY;
1.65 dyoung 227:
1.67 dyoung 228: if ((dksc->sc_flags & DKF_INITED) != 0 &&
229: (ret = cgd_ioctl_clr(sc, curlwp)) != 0)
230: return ret;
1.65 dyoung 231:
1.67 dyoung 232: disk_destroy(&dksc->sc_dkdev);
1.86 christos 233: mutex_destroy(&sc->sc_lock);
1.65 dyoung 234:
1.67 dyoung 235: return 0;
1.1 elric 236: }
237:
238: void
239: cgdattach(int num)
240: {
1.65 dyoung 241: int error;
242:
243: error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca);
244: if (error != 0)
245: aprint_error("%s: unable to register cfattach\n",
246: cgd_cd.cd_name);
247: }
248:
249: static struct cgd_softc *
250: cgd_spawn(int unit)
251: {
252: cfdata_t cf;
253:
254: cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK);
255: cf->cf_name = cgd_cd.cd_name;
256: cf->cf_atname = cgd_cd.cd_name;
257: cf->cf_unit = unit;
258: cf->cf_fstate = FSTATE_STAR;
259:
260: return device_private(config_attach_pseudo(cf));
261: }
262:
263: static int
264: cgd_destroy(device_t dev)
265: {
266: int error;
267: cfdata_t cf;
1.1 elric 268:
1.65 dyoung 269: cf = device_cfdata(dev);
270: error = config_detach(dev, DETACH_QUIET);
271: if (error)
272: return error;
273: free(cf, M_DEVBUF);
274: return 0;
1.1 elric 275: }
276:
1.18 thorpej 277: static int
1.32 christos 278: cgdopen(dev_t dev, int flags, int fmt, struct lwp *l)
1.1 elric 279: {
280: struct cgd_softc *cs;
281:
1.56 cegger 282: DPRINTF_FOLLOW(("cgdopen(0x%"PRIx64", %d)\n", dev, flags));
1.1 elric 283: GETCGD_SOFTC(cs, dev);
1.32 christos 284: return dk_open(di, &cs->sc_dksc, dev, flags, fmt, l);
1.1 elric 285: }
286:
1.18 thorpej 287: static int
1.32 christos 288: cgdclose(dev_t dev, int flags, int fmt, struct lwp *l)
1.1 elric 289: {
1.65 dyoung 290: int error;
1.1 elric 291: struct cgd_softc *cs;
1.65 dyoung 292: struct dk_softc *dksc;
1.1 elric 293:
1.56 cegger 294: DPRINTF_FOLLOW(("cgdclose(0x%"PRIx64", %d)\n", dev, flags));
1.1 elric 295: GETCGD_SOFTC(cs, dev);
1.65 dyoung 296: dksc = &cs->sc_dksc;
297: if ((error = dk_close(di, dksc, dev, flags, fmt, l)) != 0)
298: return error;
299:
300: if ((dksc->sc_flags & DKF_INITED) == 0) {
1.77 elric 301: if ((error = cgd_destroy(cs->sc_dksc.sc_dev)) != 0) {
302: aprint_error_dev(dksc->sc_dev,
1.65 dyoung 303: "unable to detach instance\n");
304: return error;
305: }
306: }
307: return 0;
1.1 elric 308: }
309:
1.18 thorpej 310: static void
1.1 elric 311: cgdstrategy(struct buf *bp)
312: {
313: struct cgd_softc *cs = getcgd_softc(bp->b_dev);
314:
315: DPRINTF_FOLLOW(("cgdstrategy(%p): b_bcount = %ld\n", bp,
316: (long)bp->b_bcount));
1.72 riastrad 317:
318: /*
319: * Reject unaligned writes. We can encrypt and decrypt only
320: * complete disk sectors, and we let the ciphers require their
321: * buffers to be aligned to 32-bit boundaries.
322: */
323: if (bp->b_blkno < 0 ||
324: (bp->b_bcount % DEV_BSIZE) != 0 ||
325: ((uintptr_t)bp->b_data & 3) != 0) {
326: bp->b_error = EINVAL;
327: bp->b_resid = bp->b_bcount;
328: biodone(bp);
329: return;
330: }
331:
1.1 elric 332: /* XXXrcd: Should we test for (cs != NULL)? */
333: dk_strategy(di, &cs->sc_dksc, bp);
334: return;
335: }
336:
1.18 thorpej 337: static int
1.1 elric 338: cgdsize(dev_t dev)
339: {
340: struct cgd_softc *cs = getcgd_softc(dev);
341:
1.56 cegger 342: DPRINTF_FOLLOW(("cgdsize(0x%"PRIx64")\n", dev));
1.1 elric 343: if (!cs)
344: return -1;
345: return dk_size(di, &cs->sc_dksc, dev);
346: }
347:
1.16 elric 348: /*
349: * cgd_{get,put}data are functions that deal with getting a buffer
350: * for the new encrypted data. We have a buffer per device so that
351: * we can ensure that we can always have a transaction in flight.
352: * We use this buffer first so that we have one less piece of
353: * malloc'ed data at any given point.
354: */
355:
356: static void *
357: cgd_getdata(struct dk_softc *dksc, unsigned long size)
358: {
1.77 elric 359: struct cgd_softc *cs = (struct cgd_softc *)dksc;
1.44 christos 360: void * data = NULL;
1.16 elric 361:
1.85 skrll 362: mutex_enter(&cs->sc_lock);
1.16 elric 363: if (cs->sc_data_used == 0) {
364: cs->sc_data_used = 1;
365: data = cs->sc_data;
366: }
1.85 skrll 367: mutex_exit(&cs->sc_lock);
1.16 elric 368:
369: if (data)
370: return data;
371:
372: return malloc(size, M_DEVBUF, M_NOWAIT);
373: }
374:
1.1 elric 375: static void
1.44 christos 376: cgd_putdata(struct dk_softc *dksc, void *data)
1.16 elric 377: {
1.77 elric 378: struct cgd_softc *cs = (struct cgd_softc *)dksc;
1.16 elric 379:
380: if (data == cs->sc_data) {
1.85 skrll 381: mutex_enter(&cs->sc_lock);
1.16 elric 382: cs->sc_data_used = 0;
1.85 skrll 383: mutex_exit(&cs->sc_lock);
1.16 elric 384: } else {
385: free(data, M_DEVBUF);
386: }
387: }
388:
1.87 bouyer 389: static void
390: cgdstart(struct dk_softc *dksc)
1.1 elric 391: {
1.77 elric 392: struct cgd_softc *cs = (struct cgd_softc *)dksc;
1.87 bouyer 393: struct buf *bp, *nbp;
394: #ifdef DIAGNOSTIC
395: struct buf *qbp;
396: #endif
1.44 christos 397: void * addr;
398: void * newaddr;
1.1 elric 399: daddr_t bn;
1.49 ad 400: struct vnode *vp;
1.1 elric 401:
1.87 bouyer 402: while ((bp = bufq_peek(dksc->sc_bufq)) != NULL) {
1.1 elric 403:
1.87 bouyer 404: DPRINTF_FOLLOW(("cgdstart(%p, %p)\n", dksc, bp));
405: disk_busy(&dksc->sc_dkdev);
1.22 perry 406:
1.87 bouyer 407: bn = bp->b_rawblkno;
1.16 elric 408:
1.87 bouyer 409: /*
410: * We attempt to allocate all of our resources up front, so that
411: * we can fail quickly if they are unavailable.
412: */
413: nbp = getiobuf(cs->sc_tvn, false);
414: if (nbp == NULL) {
1.16 elric 415: disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ));
1.87 bouyer 416: break;
1.16 elric 417: }
1.1 elric 418:
1.87 bouyer 419: /*
420: * If we are writing, then we need to encrypt the outgoing
421: * block into a new block of memory.
422: */
423: newaddr = addr = bp->b_data;
424: if ((bp->b_flags & B_READ) == 0) {
425: newaddr = cgd_getdata(dksc, bp->b_bcount);
426: if (!newaddr) {
427: putiobuf(nbp);
428: disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ));
429: break;
430: }
431: cgd_cipher(cs, newaddr, addr, bp->b_bcount, bn,
432: DEV_BSIZE, CGD_CIPHER_ENCRYPT);
433: }
434: /* we now have all needed resources to process this buf */
435: #ifdef DIAGNOSTIC
436: qbp = bufq_get(dksc->sc_bufq);
437: KASSERT(bp == qbp);
438: #else
439: (void)bufq_get(dksc->sc_bufq);
440: #endif
441: nbp->b_data = newaddr;
442: nbp->b_flags = bp->b_flags;
443: nbp->b_oflags = bp->b_oflags;
444: nbp->b_cflags = bp->b_cflags;
445: nbp->b_iodone = cgdiodone;
446: nbp->b_proc = bp->b_proc;
447: nbp->b_blkno = bn;
448: nbp->b_bcount = bp->b_bcount;
449: nbp->b_private = bp;
450:
451: BIO_COPYPRIO(nbp, bp);
452:
453: if ((nbp->b_flags & B_READ) == 0) {
454: vp = nbp->b_vp;
455: mutex_enter(vp->v_interlock);
456: vp->v_numoutput++;
457: mutex_exit(vp->v_interlock);
458: }
459: VOP_STRATEGY(cs->sc_tvn, nbp);
1.17 dbj 460: }
1.1 elric 461: }
462:
1.18 thorpej 463: static void
1.17 dbj 464: cgdiodone(struct buf *nbp)
1.1 elric 465: {
1.17 dbj 466: struct buf *obp = nbp->b_private;
467: struct cgd_softc *cs = getcgd_softc(obp->b_dev);
1.1 elric 468: struct dk_softc *dksc = &cs->sc_dksc;
1.69 bouyer 469: int s;
1.22 perry 470:
1.17 dbj 471: KDASSERT(cs);
1.1 elric 472:
1.17 dbj 473: DPRINTF_FOLLOW(("cgdiodone(%p)\n", nbp));
1.20 yamt 474: DPRINTF(CGDB_IO, ("cgdiodone: bp %p bcount %d resid %d\n",
1.1 elric 475: obp, obp->b_bcount, obp->b_resid));
1.56 cegger 476: DPRINTF(CGDB_IO, (" dev 0x%"PRIx64", nbp %p bn %" PRId64 " addr %p bcnt %d\n",
1.17 dbj 477: nbp->b_dev, nbp, nbp->b_blkno, nbp->b_data,
478: nbp->b_bcount));
1.46 ad 479: if (nbp->b_error != 0) {
480: obp->b_error = nbp->b_error;
1.62 christos 481: DPRINTF(CGDB_IO, ("%s: error %d\n", dksc->sc_xname,
482: obp->b_error));
1.1 elric 483: }
484:
1.16 elric 485: /* Perform the decryption if we are reading.
1.1 elric 486: *
487: * Note: use the blocknumber from nbp, since it is what
488: * we used to encrypt the blocks.
489: */
490:
1.16 elric 491: if (nbp->b_flags & B_READ)
1.1 elric 492: cgd_cipher(cs, obp->b_data, obp->b_data, obp->b_bcount,
493: nbp->b_blkno, DEV_BSIZE, CGD_CIPHER_DECRYPT);
494:
1.16 elric 495: /* If we allocated memory, free it now... */
1.1 elric 496: if (nbp->b_data != obp->b_data)
1.16 elric 497: cgd_putdata(dksc, nbp->b_data);
1.1 elric 498:
1.33 yamt 499: putiobuf(nbp);
1.1 elric 500:
501: /* Request is complete for whatever reason */
502: obp->b_resid = 0;
1.46 ad 503: if (obp->b_error != 0)
1.1 elric 504: obp->b_resid = obp->b_bcount;
1.69 bouyer 505: s = splbio();
1.5 mrg 506: disk_unbusy(&dksc->sc_dkdev, obp->b_bcount - obp->b_resid,
507: (obp->b_flags & B_READ));
1.1 elric 508: biodone(obp);
1.87 bouyer 509: cgdstart(dksc);
1.69 bouyer 510: splx(s);
1.1 elric 511: }
512:
513: /* XXX: we should probably put these into dksubr.c, mostly */
1.18 thorpej 514: static int
1.40 christos 515: cgdread(dev_t dev, struct uio *uio, int flags)
1.1 elric 516: {
517: struct cgd_softc *cs;
518: struct dk_softc *dksc;
519:
1.56 cegger 520: DPRINTF_FOLLOW(("cgdread(0x%llx, %p, %d)\n",
521: (unsigned long long)dev, uio, flags));
1.1 elric 522: GETCGD_SOFTC(cs, dev);
523: dksc = &cs->sc_dksc;
524: if ((dksc->sc_flags & DKF_INITED) == 0)
525: return ENXIO;
526: return physio(cgdstrategy, NULL, dev, B_READ, minphys, uio);
527: }
528:
529: /* XXX: we should probably put these into dksubr.c, mostly */
1.18 thorpej 530: static int
1.40 christos 531: cgdwrite(dev_t dev, struct uio *uio, int flags)
1.1 elric 532: {
533: struct cgd_softc *cs;
534: struct dk_softc *dksc;
535:
1.56 cegger 536: DPRINTF_FOLLOW(("cgdwrite(0x%"PRIx64", %p, %d)\n", dev, uio, flags));
1.1 elric 537: GETCGD_SOFTC(cs, dev);
538: dksc = &cs->sc_dksc;
539: if ((dksc->sc_flags & DKF_INITED) == 0)
540: return ENXIO;
541: return physio(cgdstrategy, NULL, dev, B_WRITE, minphys, uio);
542: }
543:
1.18 thorpej 544: static int
1.44 christos 545: cgdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
1.1 elric 546: {
547: struct cgd_softc *cs;
548: struct dk_softc *dksc;
549: int part = DISKPART(dev);
550: int pmask = 1 << part;
551:
1.56 cegger 552: DPRINTF_FOLLOW(("cgdioctl(0x%"PRIx64", %ld, %p, %d, %p)\n",
1.32 christos 553: dev, cmd, data, flag, l));
1.78 christos 554:
1.1 elric 555: switch (cmd) {
1.78 christos 556: case CGDIOCGET: /* don't call cgd_spawn() if the device isn't there */
557: cs = NULL;
558: dksc = NULL;
559: break;
1.1 elric 560: case CGDIOCSET:
561: case CGDIOCCLR:
562: if ((flag & FWRITE) == 0)
563: return EBADF;
1.78 christos 564: /* FALLTHROUGH */
565: default:
566: GETCGD_SOFTC(cs, dev);
567: dksc = &cs->sc_dksc;
568: break;
1.1 elric 569: }
570:
571: switch (cmd) {
572: case CGDIOCSET:
573: if (dksc->sc_flags & DKF_INITED)
1.68 dyoung 574: return EBUSY;
575: return cgd_ioctl_set(cs, data, l);
1.1 elric 576: case CGDIOCCLR:
1.65 dyoung 577: if (DK_BUSY(&cs->sc_dksc, pmask))
1.68 dyoung 578: return EBUSY;
579: return cgd_ioctl_clr(cs, l);
1.78 christos 580: case CGDIOCGET:
581: return cgd_ioctl_get(dev, data, l);
1.57 apb 582: case DIOCCACHESYNC:
583: /*
584: * XXX Do we really need to care about having a writable
585: * file descriptor here?
586: */
587: if ((flag & FWRITE) == 0)
588: return (EBADF);
589:
590: /*
591: * We pass this call down to the underlying disk.
592: */
1.68 dyoung 593: return VOP_IOCTL(cs->sc_tvn, cmd, data, flag, l->l_cred);
1.1 elric 594: default:
1.68 dyoung 595: return dk_ioctl(di, dksc, dev, cmd, data, flag, l);
1.1 elric 596: }
597: }
598:
1.18 thorpej 599: static int
1.44 christos 600: cgddump(dev_t dev, daddr_t blkno, void *va, size_t size)
1.1 elric 601: {
602: struct cgd_softc *cs;
603:
1.56 cegger 604: DPRINTF_FOLLOW(("cgddump(0x%"PRIx64", %" PRId64 ", %p, %lu)\n",
605: dev, blkno, va, (unsigned long)size));
1.1 elric 606: GETCGD_SOFTC(cs, dev);
607: return dk_dump(di, &cs->sc_dksc, dev, blkno, va, size);
608: }
609:
610: /*
611: * XXXrcd:
612: * for now we hardcode the maximum key length.
613: */
614: #define MAX_KEYSIZE 1024
615:
1.53 christos 616: static const struct {
617: const char *n;
618: int v;
619: int d;
620: } encblkno[] = {
621: { "encblkno", CGD_CIPHER_CBC_ENCBLKNO8, 1 },
622: { "encblkno8", CGD_CIPHER_CBC_ENCBLKNO8, 1 },
623: { "encblkno1", CGD_CIPHER_CBC_ENCBLKNO1, 8 },
624: };
625:
1.1 elric 626: /* ARGSUSED */
627: static int
1.32 christos 628: cgd_ioctl_set(struct cgd_softc *cs, void *data, struct lwp *l)
1.1 elric 629: {
630: struct cgd_ioctl *ci = data;
631: struct vnode *vp;
632: int ret;
1.53 christos 633: size_t i;
1.43 cbiere 634: size_t keybytes; /* key length in bytes */
1.27 drochner 635: const char *cp;
1.71 dholland 636: struct pathbuf *pb;
1.36 christos 637: char *inbuf;
1.80 christos 638: struct dk_softc *dksc = &cs->sc_dksc;
1.1 elric 639:
640: cp = ci->ci_disk;
1.71 dholland 641:
642: ret = pathbuf_copyin(ci->ci_disk, &pb);
643: if (ret != 0) {
644: return ret;
645: }
646: ret = dk_lookup(pb, l, &vp);
647: pathbuf_destroy(pb);
648: if (ret != 0) {
1.1 elric 649: return ret;
1.71 dholland 650: }
1.1 elric 651:
1.36 christos 652: inbuf = malloc(MAX_KEYSIZE, M_TEMP, M_WAITOK);
653:
1.32 christos 654: if ((ret = cgdinit(cs, cp, vp, l)) != 0)
1.1 elric 655: goto bail;
656:
1.36 christos 657: (void)memset(inbuf, 0, MAX_KEYSIZE);
1.1 elric 658: ret = copyinstr(ci->ci_alg, inbuf, 256, NULL);
659: if (ret)
660: goto bail;
661: cs->sc_cfuncs = cryptfuncs_find(inbuf);
662: if (!cs->sc_cfuncs) {
663: ret = EINVAL;
664: goto bail;
665: }
666:
1.43 cbiere 667: (void)memset(inbuf, 0, MAX_KEYSIZE);
1.36 christos 668: ret = copyinstr(ci->ci_ivmethod, inbuf, MAX_KEYSIZE, NULL);
1.1 elric 669: if (ret)
670: goto bail;
1.53 christos 671:
672: for (i = 0; i < __arraycount(encblkno); i++)
673: if (strcmp(encblkno[i].n, inbuf) == 0)
674: break;
675:
676: if (i == __arraycount(encblkno)) {
1.1 elric 677: ret = EINVAL;
678: goto bail;
679: }
680:
1.15 dan 681: keybytes = ci->ci_keylen / 8 + 1;
682: if (keybytes > MAX_KEYSIZE) {
1.1 elric 683: ret = EINVAL;
684: goto bail;
685: }
1.53 christos 686:
1.36 christos 687: (void)memset(inbuf, 0, MAX_KEYSIZE);
1.15 dan 688: ret = copyin(ci->ci_key, inbuf, keybytes);
1.1 elric 689: if (ret)
690: goto bail;
691:
692: cs->sc_cdata.cf_blocksize = ci->ci_blocksize;
1.53 christos 693: cs->sc_cdata.cf_mode = encblkno[i].v;
1.78 christos 694: cs->sc_cdata.cf_keylen = ci->ci_keylen;
1.1 elric 695: cs->sc_cdata.cf_priv = cs->sc_cfuncs->cf_init(ci->ci_keylen, inbuf,
696: &cs->sc_cdata.cf_blocksize);
1.62 christos 697: if (cs->sc_cdata.cf_blocksize > CGD_MAXBLOCKSIZE) {
698: log(LOG_WARNING, "cgd: Disallowed cipher with blocksize %zu > %u\n",
1.63 christos 699: cs->sc_cdata.cf_blocksize, CGD_MAXBLOCKSIZE);
1.62 christos 700: cs->sc_cdata.cf_priv = NULL;
701: }
1.78 christos 702:
1.53 christos 703: /*
704: * The blocksize is supposed to be in bytes. Unfortunately originally
705: * it was expressed in bits. For compatibility we maintain encblkno
706: * and encblkno8.
707: */
708: cs->sc_cdata.cf_blocksize /= encblkno[i].d;
1.36 christos 709: (void)memset(inbuf, 0, MAX_KEYSIZE);
1.1 elric 710: if (!cs->sc_cdata.cf_priv) {
711: ret = EINVAL; /* XXX is this the right error? */
712: goto bail;
713: }
1.36 christos 714: free(inbuf, M_TEMP);
1.1 elric 715:
1.80 christos 716: bufq_alloc(&dksc->sc_bufq, "fcfs", 0);
1.16 elric 717:
718: cs->sc_data = malloc(MAXPHYS, M_DEVBUF, M_WAITOK);
719: cs->sc_data_used = 0;
720:
1.80 christos 721: dksc->sc_flags |= DKF_INITED;
1.1 elric 722:
1.80 christos 723: disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, NULL);
1.77 elric 724:
1.1 elric 725: /* Attach the disk. */
1.80 christos 726: disk_attach(&dksc->sc_dkdev);
1.1 elric 727:
728: /* Try and read the disklabel. */
1.80 christos 729: dk_getdisklabel(di, dksc, 0 /* XXX ? (cause of PR 41704) */);
1.1 elric 730:
1.29 yamt 731: /* Discover wedges on this disk. */
1.80 christos 732: dkwedge_discover(&dksc->sc_dkdev);
1.29 yamt 733:
1.1 elric 734: return 0;
735:
736: bail:
1.36 christos 737: free(inbuf, M_TEMP);
1.51 ad 738: (void)vn_close(vp, FREAD|FWRITE, l->l_cred);
1.1 elric 739: return ret;
740: }
741:
742: /* ARGSUSED */
743: static int
1.65 dyoung 744: cgd_ioctl_clr(struct cgd_softc *cs, struct lwp *l)
1.1 elric 745: {
1.16 elric 746: int s;
1.80 christos 747: struct dk_softc *dksc = &cs->sc_dksc;
1.65 dyoung 748:
749: if ((dksc->sc_flags & DKF_INITED) == 0)
750: return ENXIO;
1.16 elric 751:
1.29 yamt 752: /* Delete all of our wedges. */
1.80 christos 753: dkwedge_delall(&dksc->sc_dkdev);
1.29 yamt 754:
1.16 elric 755: /* Kill off any queued buffers. */
756: s = splbio();
1.80 christos 757: bufq_drain(dksc->sc_bufq);
1.16 elric 758: splx(s);
1.80 christos 759: bufq_free(dksc->sc_bufq);
1.1 elric 760:
1.51 ad 761: (void)vn_close(cs->sc_tvn, FREAD|FWRITE, l->l_cred);
1.1 elric 762: cs->sc_cfuncs->cf_destroy(cs->sc_cdata.cf_priv);
763: free(cs->sc_tpath, M_DEVBUF);
1.16 elric 764: free(cs->sc_data, M_DEVBUF);
765: cs->sc_data_used = 0;
1.80 christos 766: dksc->sc_flags &= ~DKF_INITED;
767: disk_detach(&dksc->sc_dkdev);
1.1 elric 768:
769: return 0;
770: }
771:
772: static int
1.78 christos 773: cgd_ioctl_get(dev_t dev, void *data, struct lwp *l)
774: {
1.81 martin 775: struct cgd_softc *cs = getcgd_softc(dev);
1.78 christos 776: struct cgd_user *cgu;
777: int unit;
1.80 christos 778: struct dk_softc *dksc = &cs->sc_dksc;
1.78 christos 779:
780: unit = CGDUNIT(dev);
781: cgu = (struct cgd_user *)data;
782:
783: DPRINTF_FOLLOW(("cgd_ioctl_get(0x%"PRIx64", %d, %p, %p)\n",
784: dev, unit, data, l));
785:
786: if (cgu->cgu_unit == -1)
787: cgu->cgu_unit = unit;
788:
789: if (cgu->cgu_unit < 0)
790: return EINVAL; /* XXX: should this be ENXIO? */
791:
792: cs = device_lookup_private(&cgd_cd, unit);
1.80 christos 793: if (cs == NULL || (dksc->sc_flags & DKF_INITED) == 0) {
1.78 christos 794: cgu->cgu_dev = 0;
795: cgu->cgu_alg[0] = '\0';
796: cgu->cgu_blocksize = 0;
797: cgu->cgu_mode = 0;
798: cgu->cgu_keylen = 0;
799: }
800: else {
801: cgu->cgu_dev = cs->sc_tdev;
802: strlcpy(cgu->cgu_alg, cs->sc_cfuncs->cf_name,
803: sizeof(cgu->cgu_alg));
804: cgu->cgu_blocksize = cs->sc_cdata.cf_blocksize;
805: cgu->cgu_mode = cs->sc_cdata.cf_mode;
806: cgu->cgu_keylen = cs->sc_cdata.cf_keylen;
807: }
808: return 0;
809: }
810:
811: static int
1.27 drochner 812: cgdinit(struct cgd_softc *cs, const char *cpath, struct vnode *vp,
1.32 christos 813: struct lwp *l)
1.1 elric 814: {
1.80 christos 815: struct disk_geom *dg;
1.1 elric 816: int ret;
1.36 christos 817: char *tmppath;
1.76 christos 818: uint64_t psize;
819: unsigned secsize;
1.80 christos 820: struct dk_softc *dksc = &cs->sc_dksc;
1.1 elric 821:
822: cs->sc_tvn = vp;
1.36 christos 823: cs->sc_tpath = NULL;
1.1 elric 824:
1.36 christos 825: tmppath = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1.1 elric 826: ret = copyinstr(cpath, tmppath, MAXPATHLEN, &cs->sc_tpathlen);
827: if (ret)
828: goto bail;
829: cs->sc_tpath = malloc(cs->sc_tpathlen, M_DEVBUF, M_WAITOK);
830: memcpy(cs->sc_tpath, tmppath, cs->sc_tpathlen);
831:
1.88 hannken 832: cs->sc_tdev = vp->v_rdev;
1.1 elric 833:
1.76 christos 834: if ((ret = getdisksize(vp, &psize, &secsize)) != 0)
1.1 elric 835: goto bail;
836:
1.76 christos 837: if (psize == 0) {
1.1 elric 838: ret = ENODEV;
839: goto bail;
840: }
841:
842: /*
843: * XXX here we should probe the underlying device. If we
844: * are accessing a partition of type RAW_PART, then
845: * we should populate our initial geometry with the
846: * geometry that we discover from the device.
847: */
1.80 christos 848: dg = &dksc->sc_dkdev.dk_geom;
849: memset(dg, 0, sizeof(*dg));
850: dg->dg_secperunit = psize;
851: // XXX: Inherit?
852: dg->dg_secsize = DEV_BSIZE;
853: dg->dg_ntracks = 1;
854: dg->dg_nsectors = 1024 * (1024 / dg->dg_secsize);
855: dg->dg_ncylinders = dg->dg_secperunit / dg->dg_nsectors;
1.1 elric 856:
857: bail:
1.36 christos 858: free(tmppath, M_TEMP);
1.1 elric 859: if (ret && cs->sc_tpath)
860: free(cs->sc_tpath, M_DEVBUF);
861: return ret;
862: }
863:
864: /*
865: * Our generic cipher entry point. This takes care of the
866: * IV mode and passes off the work to the specific cipher.
867: * We implement here the IV method ``encrypted block
868: * number''.
1.22 perry 869: *
1.1 elric 870: * For the encryption case, we accomplish this by setting
871: * up a struct uio where the first iovec of the source is
872: * the blocknumber and the first iovec of the dest is a
873: * sink. We then call the cipher with an IV of zero, and
874: * the right thing happens.
1.22 perry 875: *
1.1 elric 876: * For the decryption case, we use the same basic mechanism
877: * for symmetry, but we encrypt the block number in the
878: * first iovec.
879: *
880: * We mainly do this to avoid requiring the definition of
881: * an ECB mode.
882: *
883: * XXXrcd: for now we rely on our own crypto framework defined
884: * in dev/cgd_crypto.c. This will change when we
885: * get a generic kernel crypto framework.
886: */
887:
888: static void
1.25 xtraeme 889: blkno2blkno_buf(char *sbuf, daddr_t blkno)
1.1 elric 890: {
891: int i;
892:
893: /* Set up the blkno in blkno_buf, here we do not care much
894: * about the final layout of the information as long as we
895: * can guarantee that each sector will have a different IV
896: * and that the endianness of the machine will not affect
897: * the representation that we have chosen.
898: *
899: * We choose this representation, because it does not rely
900: * on the size of buf (which is the blocksize of the cipher),
901: * but allows daddr_t to grow without breaking existing
902: * disks.
903: *
904: * Note that blkno2blkno_buf does not take a size as input,
905: * and hence must be called on a pre-zeroed buffer of length
906: * greater than or equal to sizeof(daddr_t).
907: */
908: for (i=0; i < sizeof(daddr_t); i++) {
1.25 xtraeme 909: *sbuf++ = blkno & 0xff;
1.1 elric 910: blkno >>= 8;
911: }
912: }
913:
914: static void
1.44 christos 915: cgd_cipher(struct cgd_softc *cs, void *dstv, void *srcv,
916: size_t len, daddr_t blkno, size_t secsize, int dir)
1.1 elric 917: {
1.44 christos 918: char *dst = dstv;
919: char *src = srcv;
1.1 elric 920: cfunc_cipher *cipher = cs->sc_cfuncs->cf_cipher;
921: struct uio dstuio;
922: struct uio srcuio;
923: struct iovec dstiov[2];
924: struct iovec srciov[2];
1.42 christos 925: size_t blocksize = cs->sc_cdata.cf_blocksize;
1.62 christos 926: char sink[CGD_MAXBLOCKSIZE];
927: char zero_iv[CGD_MAXBLOCKSIZE];
928: char blkno_buf[CGD_MAXBLOCKSIZE];
1.1 elric 929:
930: DPRINTF_FOLLOW(("cgd_cipher() dir=%d\n", dir));
931:
1.22 perry 932: DIAGCONDPANIC(len % blocksize != 0,
1.1 elric 933: ("cgd_cipher: len %% blocksize != 0"));
934:
935: /* ensure that sizeof(daddr_t) <= blocksize (for encblkno IVing) */
936: DIAGCONDPANIC(sizeof(daddr_t) > blocksize,
937: ("cgd_cipher: sizeof(daddr_t) > blocksize"));
938:
1.64 christos 939: memset(zero_iv, 0x0, blocksize);
1.1 elric 940:
941: dstuio.uio_iov = dstiov;
942: dstuio.uio_iovcnt = 2;
943:
944: srcuio.uio_iov = srciov;
945: srcuio.uio_iovcnt = 2;
946:
947: dstiov[0].iov_base = sink;
948: dstiov[0].iov_len = blocksize;
949: srciov[0].iov_base = blkno_buf;
950: srciov[0].iov_len = blocksize;
951: dstiov[1].iov_len = secsize;
952: srciov[1].iov_len = secsize;
953:
954: for (; len > 0; len -= secsize) {
955: dstiov[1].iov_base = dst;
956: srciov[1].iov_base = src;
957:
1.64 christos 958: memset(blkno_buf, 0x0, blocksize);
1.1 elric 959: blkno2blkno_buf(blkno_buf, blkno);
960: if (dir == CGD_CIPHER_DECRYPT) {
961: dstuio.uio_iovcnt = 1;
962: srcuio.uio_iovcnt = 1;
963: IFDEBUG(CGDB_CRYPTO, hexprint("step 0: blkno_buf",
1.64 christos 964: blkno_buf, blocksize));
1.1 elric 965: cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio,
966: zero_iv, CGD_CIPHER_ENCRYPT);
967: memcpy(blkno_buf, sink, blocksize);
968: dstuio.uio_iovcnt = 2;
969: srcuio.uio_iovcnt = 2;
970: }
971:
972: IFDEBUG(CGDB_CRYPTO, hexprint("step 1: blkno_buf",
1.64 christos 973: blkno_buf, blocksize));
1.1 elric 974: cipher(cs->sc_cdata.cf_priv, &dstuio, &srcuio, zero_iv, dir);
975: IFDEBUG(CGDB_CRYPTO, hexprint("step 2: sink",
1.64 christos 976: sink, blocksize));
1.1 elric 977:
978: dst += secsize;
979: src += secsize;
980: blkno++;
981: }
982: }
983:
984: #ifdef DEBUG
985: static void
1.26 drochner 986: hexprint(const char *start, void *buf, int len)
1.1 elric 987: {
988: char *c = buf;
989:
990: DIAGCONDPANIC(len < 0, ("hexprint: called with len < 0"));
991: printf("%s: len=%06d 0x", start, len);
992: while (len--)
1.43 cbiere 993: printf("%02x", (unsigned char) *c++);
1.1 elric 994: }
995: #endif
1.58 haad 996:
1.83 pgoyette 997: MODULE(MODULE_CLASS_DRIVER, cgd, "dk_subr");
1.74 jruoho 998:
1.58 haad 999: #ifdef _MODULE
1.66 dyoung 1000: CFDRIVER_DECL(cgd, DV_DISK, NULL);
1.74 jruoho 1001: #endif
1.58 haad 1002:
1003: static int
1004: cgd_modcmd(modcmd_t cmd, void *arg)
1005: {
1.82 martin 1006: int error = 0;
1.74 jruoho 1007:
1.82 martin 1008: #ifdef _MODULE
1.91 ! justin 1009: devmajor_t bmajor = -1, cmajor = -1;
1.82 martin 1010: #endif
1.74 jruoho 1011:
1.58 haad 1012: switch (cmd) {
1013: case MODULE_CMD_INIT:
1.74 jruoho 1014: #ifdef _MODULE
1.66 dyoung 1015: error = config_cfdriver_attach(&cgd_cd);
1016: if (error)
1017: break;
1018:
1019: error = config_cfattach_attach(cgd_cd.cd_name, &cgd_ca);
1020: if (error) {
1021: config_cfdriver_detach(&cgd_cd);
1022: aprint_error("%s: unable to register cfattach\n",
1023: cgd_cd.cd_name);
1024: break;
1025: }
1.74 jruoho 1026:
1.66 dyoung 1027: error = devsw_attach("cgd", &cgd_bdevsw, &bmajor,
1.58 haad 1028: &cgd_cdevsw, &cmajor);
1.66 dyoung 1029: if (error) {
1030: config_cfattach_detach(cgd_cd.cd_name, &cgd_ca);
1031: config_cfdriver_detach(&cgd_cd);
1032: break;
1033: }
1.74 jruoho 1034: #endif
1.58 haad 1035: break;
1036:
1037: case MODULE_CMD_FINI:
1.74 jruoho 1038: #ifdef _MODULE
1.66 dyoung 1039: error = config_cfattach_detach(cgd_cd.cd_name, &cgd_ca);
1040: if (error)
1041: break;
1042: config_cfdriver_detach(&cgd_cd);
1043: devsw_detach(&cgd_bdevsw, &cgd_cdevsw);
1.74 jruoho 1044: #endif
1.58 haad 1045: break;
1046:
1047: case MODULE_CMD_STAT:
1048: return ENOTTY;
1049:
1050: default:
1051: return ENOTTY;
1052: }
1053:
1054: return error;
1055: }
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