freebsd-dev/sys/geom/geom_mbr.c
Poul-Henning Kamp 1bdb20a68e Implement DIOCGFRONTSTUFF ioctl which reports how many bytes from the start
of the device magic stuff might occupy.

Sponsored by: DARPA & NAI Labs.
2002-04-09 15:43:32 +00:00

401 lines
10 KiB
C

/*-
* 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#ifndef _KERNEL
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <sys/param.h>
#include <stdlib.h>
#include <err.h>
#else
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#endif
#include <sys/errno.h>
#include <sys/disklabel.h>
#include <sys/sbuf.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
#define MBR_CLASS_NAME "MBR-class"
#define MBREXT_CLASS_NAME "MBREXT-class"
static void
g_dec_dos_partition(u_char *ptr, struct dos_partition *d)
{
d->dp_flag = ptr[0];
d->dp_shd = ptr[1];
d->dp_ssect = ptr[2];
d->dp_scyl = ptr[3];
d->dp_typ = ptr[4];
d->dp_ehd = ptr[5];
d->dp_esect = ptr[6];
d->dp_ecyl = ptr[7];
d->dp_start = g_dec_le4(ptr + 8);
d->dp_size = g_dec_le4(ptr + 12);
}
#if 0
static void
g_enc_dos_partition(u_char *ptr, struct dos_partition *d)
{
ptr[0] = d->dp_flag;
ptr[1] = d->dp_shd;
ptr[2] = d->dp_ssect;
ptr[3] = d->dp_scyl;
ptr[4] = d->dp_typ;
ptr[5] = d->dp_ehd;
ptr[6] = d->dp_esect;
ptr[7] = d->dp_ecyl;
g_enc_le4(ptr + 8, d->dp_start);
g_enc_le4(ptr + 12, d->dp_size);
}
#endif
struct g_mbr_softc {
int type [NDOSPART];
struct dos_partition dospart[NDOSPART];
};
static int
g_mbr_start(struct bio *bp)
{
struct g_provider *pp;
struct g_geom *gp;
struct g_mbr_softc *mp;
struct g_slicer *gsp;
int index;
pp = bp->bio_to;
index = pp->index;
gp = pp->geom;
gsp = gp->softc;
mp = gsp->softc;
if (bp->bio_cmd == BIO_GETATTR) {
if (g_haveattr_int(bp, "MBR::type", mp->type[index]))
return (1);
}
return (0);
}
static void
g_mbr_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
{
struct g_mbr_softc *mp;
struct g_slicer *gsp;
g_slice_dumpconf(sb, indent, gp, cp, pp);
gsp = gp->softc;
mp = gsp->softc;
if (pp != NULL) {
sbuf_printf(sb, "%s<type>%d</type>\n",
indent, mp->type[pp->index]);
}
}
static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
};
static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = {
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, },
};
static void
g_mbr_print(int i __unused, struct dos_partition *dp __unused)
{
#if 0
g_hexdump(dp, sizeof(dp[0]));
printf("[%d] f:%02x typ:%d", i, dp->dp_flag, dp->dp_typ);
printf(" s(CHS):%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
printf(" e(CHS):%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
printf(" s:%d l:%d\n", dp->dp_start, dp->dp_size);
#endif
}
static struct g_geom *
g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
int error, i, npart;
struct dos_partition dp[NDOSPART];
struct g_mbr_softc *ms;
struct g_slicer *gsp;
u_int fwsectors, sectorsize;
u_char *buf;
g_trace(G_T_TOPOLOGY, "mbr_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_mbr_start);
if (gp == NULL)
return (NULL);
gsp = gp->softc;
g_topology_unlock();
gp->dumpconf = g_mbr_dumpconf;
npart = 0;
while (1) { /* a trick to allow us to use break */
if (gp->rank != 2 && insist == 0)
break;
error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
if (error)
fwsectors = 17;
error = g_getattr("GEOM::sectorsize", cp, &sectorsize);
if (error)
break;
if (!error && sectorsize != 512)
break;
gsp->frontstuff = sectorsize * fwsectors;
buf = g_read_data(cp, 0, sectorsize, &error);
if (buf == NULL || error != 0)
break;
if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa) {
g_free(buf);
break;
}
for (i = 0; i < NDOSPART; i++)
g_dec_dos_partition(
buf + DOSPARTOFF + i * sizeof(struct dos_partition),
dp + i);
g_free(buf);
if (bcmp(dp, historical_bogus_partition_table,
sizeof historical_bogus_partition_table) == 0)
break;
if (bcmp(dp, historical_bogus_partition_table_fixed,
sizeof historical_bogus_partition_table_fixed) == 0)
break;
npart = 0;
for (i = 0; i < NDOSPART; i++) {
if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80)
continue;
if (dp[i].dp_size == 0)
continue;
g_mbr_print(i, dp + i);
npart++;
ms->type[i] = dp[i].dp_typ;
pp2 = g_slice_addslice(gp, i,
((off_t)dp[i].dp_start) << 9ULL,
((off_t)dp[i].dp_size) << 9ULL,
"%ss%d", gp->name, i + 1);
}
break;
}
g_topology_lock();
error = g_access_rel(cp, -1, 0, 0);
if (npart > 0) {
LIST_FOREACH(pp, &gp->provider, provider)
g_error_provider(pp, 0);
return (gp);
}
g_std_spoiled(cp);
return (NULL);
}
static struct g_class g_mbr_class = {
MBR_CLASS_NAME,
g_mbr_taste,
NULL,
G_CLASS_INITSTUFF
};
DECLARE_GEOM_CLASS(g_mbr_class, g_mbr);
#define NDOSEXTPART 32
struct g_mbrext_softc {
int type [NDOSEXTPART];
};
static int
g_mbrext_start(struct bio *bp)
{
struct g_provider *pp;
struct g_geom *gp;
struct g_mbrext_softc *mp;
struct g_slicer *gsp;
int index;
pp = bp->bio_to;
index = pp->index;
gp = pp->geom;
gsp = gp->softc;
mp = gsp->softc;
if (bp->bio_cmd == BIO_GETATTR) {
if (g_haveattr_int(bp, "MBR::type", mp->type[index]))
return (1);
}
return (0);
}
static void
g_mbrext_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
{
struct g_mbrext_softc *mp;
struct g_slicer *gsp;
g_slice_dumpconf(sb, indent, gp, cp, pp);
gsp = gp->softc;
mp = gsp->softc;
if (pp != NULL) {
sbuf_printf(sb, "%s<type>%d</type>\n",
indent, mp->type[pp->index]);
}
}
static void
g_mbrext_print(int i, struct dos_partition *dp)
{
g_hexdump(dp, sizeof(dp[0]));
printf("[%d] f:%02x typ:%d", i, dp->dp_flag, dp->dp_typ);
printf(" s(CHS):%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
printf(" e(CHS):%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
printf(" s:%d l:%d\n", dp->dp_start, dp->dp_size);
}
static struct g_geom *
g_mbrext_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
int error, i, slice;
struct g_mbrext_softc *ms;
off_t off;
u_char *buf;
struct dos_partition dp[4];
u_int fwsectors, sectorsize;
struct g_slicer *gsp;
g_trace(G_T_TOPOLOGY, "g_mbrext_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
if (strcmp(pp->geom->class->name, MBR_CLASS_NAME))
return (NULL);
gp = g_slice_new(mp, NDOSEXTPART, pp, &cp, &ms, sizeof *ms, g_mbrext_start);
if (gp == NULL)
return (NULL);
gsp = gp->softc;
g_topology_unlock();
gp->dumpconf = g_mbrext_dumpconf;
off = 0;
slice = 0;
while (1) { /* a trick to allow us to use break */
error = g_getattr("MBR::type", cp, &i);
if (error || i != DOSPTYP_EXT)
break;
error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
if (error)
fwsectors = 17;
error = g_getattr("GEOM::sectorsize", cp, &sectorsize);
if (error)
break;
if (!error && sectorsize != 512)
break;
gsp->frontstuff = sectorsize * fwsectors;
for (;;) {
buf = g_read_data(cp, off, sectorsize, &error);
if (buf == NULL || error != 0)
break;
if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa)
break;
for (i = 0; i < NDOSPART; i++)
g_dec_dos_partition(
buf + DOSPARTOFF + i * sizeof(struct dos_partition),
dp + i);
g_free(buf);
g_mbrext_print(0, dp);
g_mbrext_print(1, dp + 1);
if (dp[0].dp_flag == 0 && dp[0].dp_size != 0) {
pp2 = g_slice_addslice(gp, slice,
(((off_t)dp[0].dp_start) << 9ULL) + off,
((off_t)dp[0].dp_size) << 9ULL,
"%*.*s%d",
strlen(gp->name) - 1,
strlen(gp->name) - 1,
gp->name,
slice + 5);
ms->type[slice] = dp[0].dp_typ;
slice++;
g_error_provider(pp2, 0);
}
if (dp[1].dp_flag != 0)
break;
if (dp[1].dp_typ != DOSPTYP_EXT)
break;
if (dp[1].dp_size == 0)
break;
off = ((off_t)dp[1].dp_start) << 9ULL;
}
break;
}
g_topology_lock();
error = g_access_rel(cp, -1, 0, 0);
if (slice > 0)
return (gp);
g_topology_assert();
g_std_spoiled(cp);
g_topology_assert();
return (NULL);
}
static struct g_class g_mbrext_class = {
MBREXT_CLASS_NAME,
g_mbrext_taste,
NULL,
G_CLASS_INITSTUFF
};
DECLARE_GEOM_CLASS(g_mbrext_class, g_mbrext);