freebsd-dev/sys/geom/geom_sunlabel.c

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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/md5.h>
#include <sys/sun_disklabel.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
#include <machine/endian.h>
#define SUNLABEL_CLASS_NAME "SUN"
struct g_sunlabel_softc {
int sectorsize;
int nheads;
int nsects;
int nalt;
u_char labelsum[16];
};
static int
g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
{
int i, error;
u_int u, v, csize;
struct sun_disklabel sl;
MD5_CTX md5sum;
error = sunlabel_dec(sec0, &sl);
if (error)
return (error);
csize = sl.sl_ntracks * sl.sl_nsectors;
for (i = 0; i < SUN_NPART; i++) {
v = sl.sl_part[i].sdkp_cyloffset;
u = sl.sl_part[i].sdkp_nsectors;
error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
((off_t)v * csize) << 9ULL,
((off_t)u) << 9ULL,
ms->sectorsize,
"%s%c", gp->name, 'a' + i);
if (error)
return (error);
}
for (i = 0; i < SUN_NPART; i++) {
v = sl.sl_part[i].sdkp_cyloffset;
u = sl.sl_part[i].sdkp_nsectors;
g_slice_config(gp, i, G_SLICE_CONFIG_SET,
((off_t)v * csize) << 9ULL,
((off_t)u) << 9ULL,
ms->sectorsize,
"%s%c", gp->name, 'a' + i);
}
ms->nalt = sl.sl_acylinders;
ms->nheads = sl.sl_ntracks;
ms->nsects = sl.sl_nsectors;
/*
* Calculate MD5 from the first sector and use it for avoiding
* recursive labels creation.
*/
MD5Init(&md5sum);
MD5Update(&md5sum, sec0, ms->sectorsize);
MD5Final(ms->labelsum, &md5sum);
return (0);
}
static void
g_sunlabel_hotwrite(void *arg, int flag)
{
struct bio *bp;
struct g_geom *gp;
struct g_slicer *gsp;
struct g_slice *gsl;
struct g_sunlabel_softc *ms;
u_char *p;
int error;
KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
bp = arg;
gp = bp->bio_to->geom;
gsp = gp->softc;
ms = gsp->softc;
gsl = &gsp->slices[bp->bio_to->index];
/*
* XXX: For all practical purposes, this whould be equvivalent to
* XXX: "p = (u_char *)bp->bio_data;" because the label is always
* XXX: in the first sector and we refuse sectors smaller than the
* XXX: label.
*/
p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
error = g_sunlabel_modify(gp, ms, p);
if (error) {
g_io_deliver(bp, EPERM);
return;
}
g_slice_finish_hot(bp);
}
static void
g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
{
struct g_slicer *gsp;
struct g_sunlabel_softc *ms;
gsp = gp->softc;
ms = gsp->softc;
g_slice_dumpconf(sb, indent, gp, cp, pp);
if (indent == NULL) {
sbuf_printf(sb, " sc %u hd %u alt %u",
ms->nsects, ms->nheads, ms->nalt);
}
}
struct g_hh01 {
struct g_geom *gp;
struct g_sunlabel_softc *ms;
u_char *label;
int error;
};
static void
g_sunlabel_callconfig(void *arg, int flag)
{
struct g_hh01 *hp;
hp = arg;
hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label);
if (!hp->error)
hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer),
0, hp->label, SUN_SIZE);
}
/*
* NB! curthread is user process which GCTL'ed.
*/
static void
g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
u_char *label;
int error, i;
struct g_hh01 h0h0;
struct g_slicer *gsp;
struct g_geom *gp;
struct g_consumer *cp;
g_topology_assert();
gp = gctl_get_geom(req, mp, "geom");
if (gp == NULL)
return;
cp = LIST_FIRST(&gp->consumer);
gsp = gp->softc;
if (!strcmp(verb, "write label")) {
label = gctl_get_paraml(req, "label", SUN_SIZE);
if (label == NULL)
return;
h0h0.gp = gp;
h0h0.ms = gsp->softc;
h0h0.label = label;
h0h0.error = -1;
/* XXX: Does this reference register with our selfdestruct code ? */
error = g_access(cp, 1, 1, 1);
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if (error) {
gctl_error(req, "could not access consumer");
return;
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}
g_sunlabel_callconfig(&h0h0, 0);
g_access(cp, -1, -1, -1);
} else if (!strcmp(verb, "write bootcode")) {
label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE);
if (label == NULL)
return;
/* XXX: Does this reference register with our selfdestruct code ? */
error = g_access(cp, 1, 1, 1);
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if (error) {
gctl_error(req, "could not access consumer");
return;
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}
for (i = 0; i < SUN_NPART; i++) {
if (gsp->slices[i].length <= SUN_BOOTSIZE)
continue;
g_write_data(cp,
gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE,
SUN_BOOTSIZE - SUN_SIZE);
}
g_access(cp, -1, -1, -1);
} else {
gctl_error(req, "Unknown verb parameter");
}
}
static int
g_sunlabel_start(struct bio *bp)
{
struct g_sunlabel_softc *mp;
struct g_slicer *gsp;
gsp = bp->bio_to->geom->softc;
mp = gsp->softc;
if (bp->bio_cmd == BIO_GETATTR) {
if (g_handleattr(bp, "SUN::labelsum", mp->labelsum,
sizeof(mp->labelsum)))
return (1);
}
return (0);
}
static struct g_geom *
g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_sunlabel_softc *ms;
struct g_slicer *gsp;
u_char *buf, hash[16];
MD5_CTX md5sum;
int error;
g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
if (flags == G_TF_NORMAL &&
!strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME))
return (NULL);
gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start);
if (gp == NULL)
return (NULL);
gsp = gp->softc;
do {
ms->sectorsize = cp->provider->sectorsize;
if (ms->sectorsize < 512)
break;
g_topology_unlock();
buf = g_read_data(cp, 0, ms->sectorsize, NULL);
g_topology_lock();
if (buf == NULL)
break;
/*
* Calculate MD5 from the first sector and use it for avoiding
* recursive labels creation.
*/
MD5Init(&md5sum);
MD5Update(&md5sum, buf, ms->sectorsize);
MD5Final(ms->labelsum, &md5sum);
error = g_getattr("SUN::labelsum", cp, &hash);
if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) {
g_free(buf);
break;
}
g_sunlabel_modify(gp, ms, buf);
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g_free(buf);
break;
} while (0);
g_access(cp, -1, 0, 0);
if (LIST_EMPTY(&gp->provider)) {
g_slice_spoiled(cp);
return (NULL);
}
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g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
gsp->hot = g_sunlabel_hotwrite;
return (gp);
}
static struct g_class g_sunlabel_class = {
.name = SUNLABEL_CLASS_NAME,
.version = G_VERSION,
.taste = g_sunlabel_taste,
.ctlreq = g_sunlabel_config,
.dumpconf = g_sunlabel_dumpconf,
};
DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel);