312 lines
8.8 KiB
C
312 lines
8.8 KiB
C
/* $NetBSD: dkwedge_gpt.c,v 1.5 2006/09/13 00:48:03 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2004 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* EFI GUID Partition Table support for disk wedges
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: dkwedge_gpt.c,v 1.5 2006/09/13 00:48:03 christos Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/disk.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <sys/disklabel_gpt.h>
|
|
#include <sys/uuid.h>
|
|
|
|
static const struct {
|
|
struct uuid ptype_guid;
|
|
const char *ptype_str;
|
|
} gpt_ptype_guid_to_str_tab[] = {
|
|
{ GPT_ENT_TYPE_EFI, "msdos" }, /* XXX yes? */
|
|
#if 0
|
|
{ GPT_ENT_TYPE_FREEBSD, ??? },
|
|
#endif
|
|
{ GPT_ENT_TYPE_FREEBSD_SWAP, "swap" }, /* XXX for now */
|
|
{ GPT_ENT_TYPE_FREEBSD_UFS, "ffs" }, /* XXX for now */
|
|
|
|
/* XXX What about the MS and Linux types? */
|
|
|
|
{ { .time_low = 0 }, NULL },
|
|
};
|
|
|
|
static const char *
|
|
gpt_ptype_guid_to_str(const struct uuid *guid)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; gpt_ptype_guid_to_str_tab[i].ptype_str != NULL; i++) {
|
|
if (memcmp(&gpt_ptype_guid_to_str_tab[i].ptype_guid,
|
|
guid, sizeof(*guid)) == 0)
|
|
return (gpt_ptype_guid_to_str_tab[i].ptype_str);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static const uint32_t gpt_crc_tab[16] = {
|
|
0x00000000U, 0x1db71064U, 0x3b6e20c8U, 0x26d930acU,
|
|
0x76dc4190U, 0x6b6b51f4U, 0x4db26158U, 0x5005713cU,
|
|
0xedb88320U, 0xf00f9344U, 0xd6d6a3e8U, 0xcb61b38cU,
|
|
0x9b64c2b0U, 0x86d3d2d4U, 0xa00ae278U, 0xbdbdf21cU
|
|
};
|
|
|
|
static uint32_t
|
|
gpt_crc32(const void *vbuf, size_t len)
|
|
{
|
|
const uint8_t *buf = vbuf;
|
|
uint32_t crc;
|
|
|
|
crc = 0xffffffffU;
|
|
while (len--) {
|
|
crc ^= *buf++;
|
|
crc = (crc >> 4) ^ gpt_crc_tab[crc & 0xf];
|
|
crc = (crc >> 4) ^ gpt_crc_tab[crc & 0xf];
|
|
}
|
|
|
|
return (crc ^ 0xffffffffU);
|
|
}
|
|
|
|
static int
|
|
gpt_verify_header_crc(struct gpt_hdr *hdr)
|
|
{
|
|
uint32_t crc;
|
|
int rv;
|
|
|
|
crc = hdr->hdr_crc_self;
|
|
hdr->hdr_crc_self = 0;
|
|
rv = le32toh(crc) == gpt_crc32(hdr, le32toh(hdr->hdr_size));
|
|
hdr->hdr_crc_self = crc;
|
|
|
|
return (rv);
|
|
}
|
|
|
|
static int
|
|
dkwedge_discover_gpt(struct disk *pdk, struct vnode *vp)
|
|
{
|
|
static const struct uuid ent_type_unused = GPT_ENT_TYPE_UNUSED;
|
|
static const char gpt_hdr_sig[] = GPT_HDR_SIG;
|
|
struct dkwedge_info dkw;
|
|
void *buf;
|
|
struct gpt_hdr *hdr;
|
|
struct gpt_ent *ent;
|
|
uint32_t entries, entsz;
|
|
daddr_t lba_start, lba_end, lba_table;
|
|
uint32_t gpe_crc;
|
|
int error;
|
|
u_int i;
|
|
|
|
buf = malloc(DEV_BSIZE, M_DEVBUF, M_WAITOK);
|
|
|
|
/*
|
|
* Note: We don't bother with a Legacy or Protective MBR
|
|
* here. If a GPT is found, then the search stops, and
|
|
* the GPT is authoritative.
|
|
*/
|
|
|
|
/* Read in the GPT Header. */
|
|
error = dkwedge_read(pdk, vp, GPT_HDR_BLKNO, buf, DEV_BSIZE);
|
|
if (error)
|
|
goto out;
|
|
hdr = buf;
|
|
|
|
/* Validate it. */
|
|
if (memcmp(gpt_hdr_sig, hdr->hdr_sig, sizeof(hdr->hdr_sig)) != 0) {
|
|
/* XXX Should check at end-of-disk. */
|
|
error = ESRCH;
|
|
goto out;
|
|
}
|
|
if (hdr->hdr_revision != htole32(GPT_HDR_REVISION)) {
|
|
/* XXX Should check at end-of-disk. */
|
|
error = ESRCH;
|
|
goto out;
|
|
}
|
|
if (le32toh(hdr->hdr_size) > DEV_BSIZE) {
|
|
/* XXX Should check at end-of-disk. */
|
|
error = ESRCH;
|
|
goto out;
|
|
}
|
|
if (gpt_verify_header_crc(hdr) == 0) {
|
|
/* XXX Should check at end-of-disk. */
|
|
error = ESRCH;
|
|
goto out;
|
|
}
|
|
|
|
/* XXX Now that we found it, should we validate the backup? */
|
|
|
|
{
|
|
struct uuid disk_guid;
|
|
char guid_str[UUID_STR_LEN];
|
|
uuid_dec_le(hdr->hdr_guid, &disk_guid);
|
|
uuid_snprintf(guid_str, sizeof(guid_str), &disk_guid);
|
|
aprint_verbose("%s: GPT GUID: %s\n", pdk->dk_name, guid_str);
|
|
}
|
|
|
|
entries = le32toh(hdr->hdr_entries);
|
|
entsz = roundup(le32toh(hdr->hdr_entsz), 8);
|
|
if (entsz > roundup(sizeof(struct gpt_ent), 8)) {
|
|
aprint_error("%s: bogus GPT entry size: %u\n",
|
|
pdk->dk_name, le32toh(hdr->hdr_entsz));
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
gpe_crc = le32toh(hdr->hdr_crc_table);
|
|
|
|
/* XXX Clamp entries at 128 for now. */
|
|
if (entries > 128) {
|
|
aprint_error("%s: WARNING: clamping number of GPT entries to "
|
|
"128 (was %u)\n", pdk->dk_name, entries);
|
|
entries = 128;
|
|
}
|
|
|
|
lba_start = le64toh(hdr->hdr_lba_start);
|
|
lba_end = le64toh(hdr->hdr_lba_end);
|
|
lba_table = le64toh(hdr->hdr_lba_table);
|
|
if (lba_start < 0 || lba_end < 0 || lba_table < 0) {
|
|
aprint_error("%s: GPT block numbers out of range\n",
|
|
pdk->dk_name);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
free(buf, M_DEVBUF);
|
|
buf = malloc(roundup(entries * entsz, DEV_BSIZE), M_DEVBUF, M_WAITOK);
|
|
error = dkwedge_read(pdk, vp, lba_table, buf,
|
|
roundup(entries * entsz, DEV_BSIZE));
|
|
if (error) {
|
|
/* XXX Should check alternate location. */
|
|
aprint_error("%s: unable to read GPT partition array, "
|
|
"error = %d\n", pdk->dk_name, error);
|
|
goto out;
|
|
}
|
|
|
|
if (gpt_crc32(buf, entries * entsz) != gpe_crc) {
|
|
/* XXX Should check alternate location. */
|
|
aprint_error("%s: bad GPT partition array CRC\n",
|
|
pdk->dk_name);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Walk the partitions, adding a wedge for each type we know about.
|
|
*/
|
|
for (i = 0; i < entries; i++) {
|
|
struct uuid ptype_guid, ent_guid;
|
|
const char *ptype;
|
|
int j;
|
|
char ptype_guid_str[UUID_STR_LEN], ent_guid_str[UUID_STR_LEN];
|
|
|
|
ent = (struct gpt_ent *)((caddr_t)buf + (i * entsz));
|
|
|
|
uuid_dec_le(ent->ent_type, &ptype_guid);
|
|
if (memcmp(&ptype_guid, &ent_type_unused,
|
|
sizeof(ptype_guid)) == 0)
|
|
continue;
|
|
|
|
uuid_dec_le(ent->ent_guid, &ent_guid);
|
|
|
|
uuid_snprintf(ptype_guid_str, sizeof(ptype_guid_str),
|
|
&ptype_guid);
|
|
uuid_snprintf(ent_guid_str, sizeof(ent_guid_str),
|
|
&ent_guid);
|
|
|
|
/* Skip it if we don't grok this ptype. */
|
|
if ((ptype = gpt_ptype_guid_to_str(&ptype_guid)) == NULL) {
|
|
/*
|
|
* XXX Should probably just add these... maybe
|
|
* XXX just have an empty ptype?
|
|
*/
|
|
aprint_verbose("%s: skipping entry %u (%s), type %s\n",
|
|
pdk->dk_name, i, ent_guid_str, ptype_guid_str);
|
|
continue;
|
|
}
|
|
strcpy(dkw.dkw_ptype, ptype);
|
|
|
|
strcpy(dkw.dkw_parent, pdk->dk_name);
|
|
dkw.dkw_offset = le64toh(ent->ent_lba_start);
|
|
dkw.dkw_size = le64toh(ent->ent_lba_end) - dkw.dkw_offset + 1;
|
|
|
|
/* XXX Make sure it falls within the disk's data area. */
|
|
|
|
if (ent->ent_name[0] == 0x0000)
|
|
strcpy(dkw.dkw_wname, ent_guid_str);
|
|
else {
|
|
for (j = 0; ent->ent_name[j] != 0x0000; j++) {
|
|
/* XXX UTF-16 -> UTF-8 */
|
|
dkw.dkw_wname[j] =
|
|
le16toh(ent->ent_name[j]) & 0xff;
|
|
}
|
|
dkw.dkw_wname[j] = '\0';
|
|
}
|
|
|
|
/*
|
|
* Try with the partition name first. If that fails,
|
|
* use the GUID string. If that fails, punt.
|
|
*/
|
|
if ((error = dkwedge_add(&dkw)) == EEXIST) {
|
|
aprint_error("%s: wedge named '%s' already exists, "
|
|
"trying '%s'\n", pdk->dk_name,
|
|
dkw.dkw_wname, /* XXX Unicode */
|
|
ent_guid_str);
|
|
strcpy(dkw.dkw_wname, ent_guid_str);
|
|
error = dkwedge_add(&dkw);
|
|
}
|
|
if (error == EEXIST)
|
|
aprint_error("%s: wedge named '%s' already exists, "
|
|
"manual intervention required\n", pdk->dk_name,
|
|
dkw.dkw_wname);
|
|
else if (error)
|
|
aprint_error("%s: error %d adding entry %u (%s), "
|
|
"type %s\n", pdk->dk_name, error, i, ent_guid_str,
|
|
ptype_guid_str);
|
|
}
|
|
error = 0;
|
|
|
|
out:
|
|
free(buf, M_DEVBUF);
|
|
return (error);
|
|
}
|
|
|
|
DKWEDGE_DISCOVERY_METHOD_DECL(GPT, 0, dkwedge_discover_gpt);
|