part.c revision 332956
1/*- 2 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/11/stand/common/part.c 332956 2018-04-24 18:19:30Z benno $"); 29 30#include <stand.h> 31#include <sys/param.h> 32#include <sys/diskmbr.h> 33#include <sys/disklabel.h> 34#include <sys/endian.h> 35#include <sys/gpt.h> 36#include <sys/stddef.h> 37#include <sys/queue.h> 38#include <sys/vtoc.h> 39 40#include <fs/cd9660/iso.h> 41 42#include <crc32.h> 43#include <part.h> 44#include <uuid.h> 45 46#ifdef PART_DEBUG 47#define DEBUG(fmt, args...) printf("%s: " fmt "\n", __func__, ## args) 48#else 49#define DEBUG(fmt, args...) 50#endif 51 52#ifdef LOADER_GPT_SUPPORT 53#define MAXTBLSZ 64 54static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 55static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; 56static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 57static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 58static const uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD; 59static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 60static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 61static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 62static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 63static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 64#endif 65 66struct pentry { 67 struct ptable_entry part; 68 uint64_t flags; 69 union { 70 uint8_t bsd; 71 uint8_t mbr; 72 uuid_t gpt; 73 uint16_t vtoc8; 74 } type; 75 STAILQ_ENTRY(pentry) entry; 76}; 77 78struct ptable { 79 enum ptable_type type; 80 uint16_t sectorsize; 81 uint64_t sectors; 82 83 STAILQ_HEAD(, pentry) entries; 84}; 85 86static struct parttypes { 87 enum partition_type type; 88 const char *desc; 89} ptypes[] = { 90 { PART_UNKNOWN, "Unknown" }, 91 { PART_EFI, "EFI" }, 92 { PART_FREEBSD, "FreeBSD" }, 93 { PART_FREEBSD_BOOT, "FreeBSD boot" }, 94 { PART_FREEBSD_NANDFS, "FreeBSD nandfs" }, 95 { PART_FREEBSD_UFS, "FreeBSD UFS" }, 96 { PART_FREEBSD_ZFS, "FreeBSD ZFS" }, 97 { PART_FREEBSD_SWAP, "FreeBSD swap" }, 98 { PART_FREEBSD_VINUM, "FreeBSD vinum" }, 99 { PART_LINUX, "Linux" }, 100 { PART_LINUX_SWAP, "Linux swap" }, 101 { PART_DOS, "DOS/Windows" }, 102 { PART_ISO9660, "ISO9660" }, 103}; 104 105const char * 106parttype2str(enum partition_type type) 107{ 108 size_t i; 109 110 for (i = 0; i < nitems(ptypes); i++) 111 if (ptypes[i].type == type) 112 return (ptypes[i].desc); 113 return (ptypes[0].desc); 114} 115 116#ifdef LOADER_GPT_SUPPORT 117static void 118uuid_letoh(uuid_t *uuid) 119{ 120 121 uuid->time_low = le32toh(uuid->time_low); 122 uuid->time_mid = le16toh(uuid->time_mid); 123 uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version); 124} 125 126static enum partition_type 127gpt_parttype(uuid_t type) 128{ 129 130 if (uuid_equal(&type, &gpt_uuid_efi, NULL)) 131 return (PART_EFI); 132 else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL)) 133 return (PART_DOS); 134 else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL)) 135 return (PART_FREEBSD_BOOT); 136 else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL)) 137 return (PART_FREEBSD_UFS); 138 else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL)) 139 return (PART_FREEBSD_ZFS); 140 else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL)) 141 return (PART_FREEBSD_SWAP); 142 else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL)) 143 return (PART_FREEBSD_VINUM); 144 else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL)) 145 return (PART_FREEBSD_NANDFS); 146 else if (uuid_equal(&type, &gpt_uuid_freebsd, NULL)) 147 return (PART_FREEBSD); 148 return (PART_UNKNOWN); 149} 150 151static struct gpt_hdr * 152gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last, 153 uint16_t sectorsize) 154{ 155 uint32_t sz, crc; 156 157 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) { 158 DEBUG("no GPT signature"); 159 return (NULL); 160 } 161 sz = le32toh(hdr->hdr_size); 162 if (sz < 92 || sz > sectorsize) { 163 DEBUG("invalid GPT header size: %d", sz); 164 return (NULL); 165 } 166 crc = le32toh(hdr->hdr_crc_self); 167 hdr->hdr_crc_self = 0; 168 if (crc32(hdr, sz) != crc) { 169 DEBUG("GPT header's CRC doesn't match"); 170 return (NULL); 171 } 172 hdr->hdr_crc_self = crc; 173 hdr->hdr_revision = le32toh(hdr->hdr_revision); 174 if (hdr->hdr_revision < GPT_HDR_REVISION) { 175 DEBUG("unsupported GPT revision %d", hdr->hdr_revision); 176 return (NULL); 177 } 178 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 179 if (hdr->hdr_lba_self != lba_self) { 180 DEBUG("self LBA doesn't match"); 181 return (NULL); 182 } 183 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 184 if (hdr->hdr_lba_alt == hdr->hdr_lba_self) { 185 DEBUG("invalid alternate LBA"); 186 return (NULL); 187 } 188 hdr->hdr_entries = le32toh(hdr->hdr_entries); 189 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 190 if (hdr->hdr_entries == 0 || 191 hdr->hdr_entsz < sizeof(struct gpt_ent) || 192 sectorsize % hdr->hdr_entsz != 0) { 193 DEBUG("invalid entry size or number of entries"); 194 return (NULL); 195 } 196 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 197 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 198 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 199 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 200 uuid_letoh(&hdr->hdr_uuid); 201 return (hdr); 202} 203 204static int 205gpt_checktbl(const struct gpt_hdr *hdr, uint8_t *tbl, size_t size, 206 uint64_t lba_last) 207{ 208 struct gpt_ent *ent; 209 uint32_t i, cnt; 210 211 cnt = size / hdr->hdr_entsz; 212 if (hdr->hdr_entries <= cnt) { 213 cnt = hdr->hdr_entries; 214 /* Check CRC only when buffer size is enough for table. */ 215 if (hdr->hdr_crc_table != 216 crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz)) { 217 DEBUG("GPT table's CRC doesn't match"); 218 return (-1); 219 } 220 } 221 for (i = 0; i < cnt; i++) { 222 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); 223 uuid_letoh(&ent->ent_type); 224 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 225 continue; 226 ent->ent_lba_start = le64toh(ent->ent_lba_start); 227 ent->ent_lba_end = le64toh(ent->ent_lba_end); 228 } 229 return (0); 230} 231 232static struct ptable * 233ptable_gptread(struct ptable *table, void *dev, diskread_t dread) 234{ 235 struct pentry *entry; 236 struct gpt_hdr *phdr, hdr; 237 struct gpt_ent *ent; 238 uint8_t *buf, *tbl; 239 uint64_t offset; 240 int pri, sec; 241 size_t size, i; 242 243 buf = malloc(table->sectorsize); 244 if (buf == NULL) 245 return (NULL); 246 tbl = malloc(table->sectorsize * MAXTBLSZ); 247 if (tbl == NULL) { 248 free(buf); 249 return (NULL); 250 } 251 /* Read the primary GPT header. */ 252 if (dread(dev, buf, 1, 1) != 0) { 253 ptable_close(table); 254 table = NULL; 255 goto out; 256 } 257 pri = sec = 0; 258 /* Check the primary GPT header. */ 259 phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1, 260 table->sectorsize); 261 if (phdr != NULL) { 262 /* Read the primary GPT table. */ 263 size = MIN(MAXTBLSZ, 264 howmany(phdr->hdr_entries * phdr->hdr_entsz, 265 table->sectorsize)); 266 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 267 gpt_checktbl(phdr, tbl, size * table->sectorsize, 268 table->sectors - 1) == 0) { 269 memcpy(&hdr, phdr, sizeof(hdr)); 270 pri = 1; 271 } 272 } 273 offset = pri ? hdr.hdr_lba_alt: table->sectors - 1; 274 /* Read the backup GPT header. */ 275 if (dread(dev, buf, 1, offset) != 0) 276 phdr = NULL; 277 else 278 phdr = gpt_checkhdr((struct gpt_hdr *)buf, offset, 279 table->sectors - 1, table->sectorsize); 280 if (phdr != NULL) { 281 /* 282 * Compare primary and backup headers. 283 * If they are equal, then we do not need to read backup 284 * table. If they are different, then prefer backup header 285 * and try to read backup table. 286 */ 287 if (pri == 0 || 288 uuid_equal(&hdr.hdr_uuid, &phdr->hdr_uuid, NULL) == 0 || 289 hdr.hdr_revision != phdr->hdr_revision || 290 hdr.hdr_size != phdr->hdr_size || 291 hdr.hdr_lba_start != phdr->hdr_lba_start || 292 hdr.hdr_lba_end != phdr->hdr_lba_end || 293 hdr.hdr_entries != phdr->hdr_entries || 294 hdr.hdr_entsz != phdr->hdr_entsz || 295 hdr.hdr_crc_table != phdr->hdr_crc_table) { 296 /* Read the backup GPT table. */ 297 size = MIN(MAXTBLSZ, 298 howmany(phdr->hdr_entries * phdr->hdr_entsz, 299 table->sectorsize)); 300 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 301 gpt_checktbl(phdr, tbl, size * table->sectorsize, 302 table->sectors - 1) == 0) { 303 memcpy(&hdr, phdr, sizeof(hdr)); 304 sec = 1; 305 } 306 } 307 } 308 if (pri == 0 && sec == 0) { 309 /* Both primary and backup tables are invalid. */ 310 table->type = PTABLE_NONE; 311 goto out; 312 } 313 DEBUG("GPT detected"); 314 size = MIN(hdr.hdr_entries * hdr.hdr_entsz, 315 MAXTBLSZ * table->sectorsize); 316 317 /* 318 * If the disk's sector count is smaller than the sector count recorded 319 * in the disk's GPT table header, set the table->sectors to the value 320 * recorded in GPT tables. This is done to work around buggy firmware 321 * that returns truncated disk sizes. 322 * 323 * Note, this is still not a foolproof way to get disk's size. For 324 * example, an image file can be truncated when copied to smaller media. 325 */ 326 if (hdr.hdr_lba_alt + 1 > table->sectors) 327 table->sectors = hdr.hdr_lba_alt + 1; 328 329 for (i = 0; i < size / hdr.hdr_entsz; i++) { 330 ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz); 331 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 332 continue; 333 334 /* Simple sanity checks. */ 335 if (ent->ent_lba_start < hdr.hdr_lba_start || 336 ent->ent_lba_end > hdr.hdr_lba_end || 337 ent->ent_lba_start > ent->ent_lba_end) 338 continue; 339 340 entry = malloc(sizeof(*entry)); 341 if (entry == NULL) 342 break; 343 entry->part.start = ent->ent_lba_start; 344 entry->part.end = ent->ent_lba_end; 345 entry->part.index = i + 1; 346 entry->part.type = gpt_parttype(ent->ent_type); 347 entry->flags = le64toh(ent->ent_attr); 348 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 349 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 350 DEBUG("new GPT partition added"); 351 } 352out: 353 free(buf); 354 free(tbl); 355 return (table); 356} 357#endif /* LOADER_GPT_SUPPORT */ 358 359#ifdef LOADER_MBR_SUPPORT 360/* We do not need to support too many EBR partitions in the loader */ 361#define MAXEBRENTRIES 8 362static enum partition_type 363mbr_parttype(uint8_t type) 364{ 365 366 switch (type) { 367 case DOSPTYP_386BSD: 368 return (PART_FREEBSD); 369 case DOSPTYP_LINSWP: 370 return (PART_LINUX_SWAP); 371 case DOSPTYP_LINUX: 372 return (PART_LINUX); 373 case 0x01: 374 case 0x04: 375 case 0x06: 376 case 0x07: 377 case 0x0b: 378 case 0x0c: 379 case 0x0e: 380 return (PART_DOS); 381 } 382 return (PART_UNKNOWN); 383} 384 385static struct ptable * 386ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 387{ 388 struct dos_partition *dp; 389 struct pentry *e1, *entry; 390 uint32_t start, end, offset; 391 u_char *buf; 392 int i, index; 393 394 STAILQ_FOREACH(e1, &table->entries, entry) { 395 if (e1->type.mbr == DOSPTYP_EXT || 396 e1->type.mbr == DOSPTYP_EXTLBA) 397 break; 398 } 399 if (e1 == NULL) 400 return (table); 401 index = 5; 402 offset = e1->part.start; 403 buf = malloc(table->sectorsize); 404 if (buf == NULL) 405 return (table); 406 DEBUG("EBR detected"); 407 for (i = 0; i < MAXEBRENTRIES; i++) { 408#if 0 /* Some BIOSes return an incorrect number of sectors */ 409 if (offset >= table->sectors) 410 break; 411#endif 412 if (dread(dev, buf, 1, offset) != 0) 413 break; 414 dp = (struct dos_partition *)(buf + DOSPARTOFF); 415 if (dp[0].dp_typ == 0) 416 break; 417 start = le32toh(dp[0].dp_start); 418 if (dp[0].dp_typ == DOSPTYP_EXT && 419 dp[1].dp_typ == 0) { 420 offset = e1->part.start + start; 421 continue; 422 } 423 end = le32toh(dp[0].dp_size); 424 entry = malloc(sizeof(*entry)); 425 if (entry == NULL) 426 break; 427 entry->part.start = offset + start; 428 entry->part.end = entry->part.start + end - 1; 429 entry->part.index = index++; 430 entry->part.type = mbr_parttype(dp[0].dp_typ); 431 entry->flags = dp[0].dp_flag; 432 entry->type.mbr = dp[0].dp_typ; 433 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 434 DEBUG("new EBR partition added"); 435 if (dp[1].dp_typ == 0) 436 break; 437 offset = e1->part.start + le32toh(dp[1].dp_start); 438 } 439 free(buf); 440 return (table); 441} 442#endif /* LOADER_MBR_SUPPORT */ 443 444static enum partition_type 445bsd_parttype(uint8_t type) 446{ 447 448 switch (type) { 449 case FS_NANDFS: 450 return (PART_FREEBSD_NANDFS); 451 case FS_SWAP: 452 return (PART_FREEBSD_SWAP); 453 case FS_BSDFFS: 454 return (PART_FREEBSD_UFS); 455 case FS_VINUM: 456 return (PART_FREEBSD_VINUM); 457 case FS_ZFS: 458 return (PART_FREEBSD_ZFS); 459 } 460 return (PART_UNKNOWN); 461} 462 463static struct ptable * 464ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 465{ 466 struct disklabel *dl; 467 struct partition *part; 468 struct pentry *entry; 469 uint8_t *buf; 470 uint32_t raw_offset; 471 int i; 472 473 if (table->sectorsize < sizeof(struct disklabel)) { 474 DEBUG("Too small sectorsize"); 475 return (table); 476 } 477 buf = malloc(table->sectorsize); 478 if (buf == NULL) 479 return (table); 480 if (dread(dev, buf, 1, 1) != 0) { 481 DEBUG("read failed"); 482 ptable_close(table); 483 table = NULL; 484 goto out; 485 } 486 dl = (struct disklabel *)buf; 487 if (le32toh(dl->d_magic) != DISKMAGIC && 488 le32toh(dl->d_magic2) != DISKMAGIC) 489 goto out; 490 if (le32toh(dl->d_secsize) != table->sectorsize) { 491 DEBUG("unsupported sector size"); 492 goto out; 493 } 494 dl->d_npartitions = le16toh(dl->d_npartitions); 495 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 496 DEBUG("invalid number of partitions"); 497 goto out; 498 } 499 DEBUG("BSD detected"); 500 part = &dl->d_partitions[0]; 501 raw_offset = le32toh(part[RAW_PART].p_offset); 502 for (i = 0; i < dl->d_npartitions; i++, part++) { 503 if (i == RAW_PART) 504 continue; 505 if (part->p_size == 0) 506 continue; 507 entry = malloc(sizeof(*entry)); 508 if (entry == NULL) 509 break; 510 entry->part.start = le32toh(part->p_offset) - raw_offset; 511 entry->part.end = entry->part.start + 512 le32toh(part->p_size) - 1; 513 entry->part.type = bsd_parttype(part->p_fstype); 514 entry->part.index = i; /* starts from zero */ 515 entry->type.bsd = part->p_fstype; 516 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 517 DEBUG("new BSD partition added"); 518 } 519 table->type = PTABLE_BSD; 520out: 521 free(buf); 522 return (table); 523} 524 525#ifdef LOADER_VTOC8_SUPPORT 526static enum partition_type 527vtoc8_parttype(uint16_t type) 528{ 529 530 switch (type) { 531 case VTOC_TAG_FREEBSD_NANDFS: 532 return (PART_FREEBSD_NANDFS); 533 case VTOC_TAG_FREEBSD_SWAP: 534 return (PART_FREEBSD_SWAP); 535 case VTOC_TAG_FREEBSD_UFS: 536 return (PART_FREEBSD_UFS); 537 case VTOC_TAG_FREEBSD_VINUM: 538 return (PART_FREEBSD_VINUM); 539 case VTOC_TAG_FREEBSD_ZFS: 540 return (PART_FREEBSD_ZFS); 541 } 542 return (PART_UNKNOWN); 543} 544 545static struct ptable * 546ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 547{ 548 struct pentry *entry; 549 struct vtoc8 *dl; 550 uint8_t *buf; 551 uint16_t sum, heads, sectors; 552 int i; 553 554 if (table->sectorsize != sizeof(struct vtoc8)) 555 return (table); 556 buf = malloc(table->sectorsize); 557 if (buf == NULL) 558 return (table); 559 if (dread(dev, buf, 1, 0) != 0) { 560 DEBUG("read failed"); 561 ptable_close(table); 562 table = NULL; 563 goto out; 564 } 565 dl = (struct vtoc8 *)buf; 566 /* Check the sum */ 567 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 568 sum ^= be16dec(buf + i); 569 if (sum != 0) { 570 DEBUG("incorrect checksum"); 571 goto out; 572 } 573 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 574 DEBUG("invalid number of entries"); 575 goto out; 576 } 577 sectors = be16toh(dl->nsecs); 578 heads = be16toh(dl->nheads); 579 if (sectors * heads == 0) { 580 DEBUG("invalid geometry"); 581 goto out; 582 } 583 DEBUG("VTOC8 detected"); 584 for (i = 0; i < VTOC8_NPARTS; i++) { 585 dl->part[i].tag = be16toh(dl->part[i].tag); 586 if (i == VTOC_RAW_PART || 587 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 588 continue; 589 entry = malloc(sizeof(*entry)); 590 if (entry == NULL) 591 break; 592 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 593 entry->part.end = be32toh(dl->map[i].nblks) + 594 entry->part.start - 1; 595 entry->part.type = vtoc8_parttype(dl->part[i].tag); 596 entry->part.index = i; /* starts from zero */ 597 entry->type.vtoc8 = dl->part[i].tag; 598 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 599 DEBUG("new VTOC8 partition added"); 600 } 601 table->type = PTABLE_VTOC8; 602out: 603 free(buf); 604 return (table); 605 606} 607#endif /* LOADER_VTOC8_SUPPORT */ 608 609#define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / table->sectorsize) 610 611static struct ptable * 612ptable_iso9660read(struct ptable *table, void *dev, diskread_t dread) 613{ 614 uint8_t *buf; 615 struct iso_primary_descriptor *vd; 616 struct pentry *entry; 617 618 buf = malloc(table->sectorsize); 619 if (buf == NULL) 620 return (table); 621 622 if (dread(dev, buf, 1, cdb2devb(16)) != 0) { 623 DEBUG("read failed"); 624 ptable_close(table); 625 table = NULL; 626 goto out; 627 } 628 vd = (struct iso_primary_descriptor *)buf; 629 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0) 630 goto out; 631 632 entry = malloc(sizeof(*entry)); 633 if (entry == NULL) 634 goto out; 635 entry->part.start = 0; 636 entry->part.end = table->sectors; 637 entry->part.type = PART_ISO9660; 638 entry->part.index = 0; 639 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 640 641 table->type = PTABLE_ISO9660; 642 643out: 644 free(buf); 645 return (table); 646} 647 648struct ptable * 649ptable_open(void *dev, uint64_t sectors, uint16_t sectorsize, 650 diskread_t *dread) 651{ 652 struct dos_partition *dp; 653 struct ptable *table; 654 uint8_t *buf; 655 int i, count; 656#ifdef LOADER_MBR_SUPPORT 657 struct pentry *entry; 658 uint32_t start, end; 659 int has_ext; 660#endif 661 table = NULL; 662 buf = malloc(sectorsize); 663 if (buf == NULL) 664 return (NULL); 665 /* First, read the MBR. */ 666 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 667 DEBUG("read failed"); 668 goto out; 669 } 670 671 table = malloc(sizeof(*table)); 672 if (table == NULL) 673 goto out; 674 table->sectors = sectors; 675 table->sectorsize = sectorsize; 676 table->type = PTABLE_NONE; 677 STAILQ_INIT(&table->entries); 678 679 if (ptable_iso9660read(table, dev, dread) != NULL) { 680 if (table->type == PTABLE_ISO9660) 681 goto out; 682 } 683 684#ifdef LOADER_VTOC8_SUPPORT 685 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 686 if (ptable_vtoc8read(table, dev, dread) == NULL) { 687 /* Read error. */ 688 table = NULL; 689 goto out; 690 } else if (table->type == PTABLE_VTOC8) 691 goto out; 692 } 693#endif 694 /* Check the BSD label. */ 695 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 696 table = NULL; 697 goto out; 698 } else if (table->type == PTABLE_BSD) 699 goto out; 700 701#if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 702 /* Check the MBR magic. */ 703 if (buf[DOSMAGICOFFSET] != 0x55 || 704 buf[DOSMAGICOFFSET + 1] != 0xaa) { 705 DEBUG("magic sequence not found"); 706#if defined(LOADER_GPT_SUPPORT) 707 /* There is no PMBR, check that we have backup GPT */ 708 table->type = PTABLE_GPT; 709 table = ptable_gptread(table, dev, dread); 710#endif 711 goto out; 712 } 713 /* Check that we have PMBR. Also do some validation. */ 714 dp = (struct dos_partition *)(buf + DOSPARTOFF); 715 for (i = 0, count = 0; i < NDOSPART; i++) { 716 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 717 DEBUG("invalid partition flag %x", dp[i].dp_flag); 718 goto out; 719 } 720#ifdef LOADER_GPT_SUPPORT 721 if (dp[i].dp_typ == DOSPTYP_PMBR) { 722 table->type = PTABLE_GPT; 723 DEBUG("PMBR detected"); 724 } 725#endif 726 if (dp[i].dp_typ != 0) 727 count++; 728 } 729 /* Do we have some invalid values? */ 730 if (table->type == PTABLE_GPT && count > 1) { 731 if (dp[1].dp_typ != DOSPTYP_HFS) { 732 table->type = PTABLE_NONE; 733 DEBUG("Incorrect PMBR, ignore it"); 734 } else { 735 DEBUG("Bootcamp detected"); 736 } 737 } 738#ifdef LOADER_GPT_SUPPORT 739 if (table->type == PTABLE_GPT) { 740 table = ptable_gptread(table, dev, dread); 741 goto out; 742 } 743#endif 744#ifdef LOADER_MBR_SUPPORT 745 /* Read MBR. */ 746 DEBUG("MBR detected"); 747 table->type = PTABLE_MBR; 748 for (i = has_ext = 0; i < NDOSPART; i++) { 749 if (dp[i].dp_typ == 0) 750 continue; 751 start = le32dec(&(dp[i].dp_start)); 752 end = le32dec(&(dp[i].dp_size)); 753 if (start == 0 || end == 0) 754 continue; 755#if 0 /* Some BIOSes return an incorrect number of sectors */ 756 if (start + end - 1 >= sectors) 757 continue; /* XXX: ignore */ 758#endif 759 if (dp[i].dp_typ == DOSPTYP_EXT || 760 dp[i].dp_typ == DOSPTYP_EXTLBA) 761 has_ext = 1; 762 entry = malloc(sizeof(*entry)); 763 if (entry == NULL) 764 break; 765 entry->part.start = start; 766 entry->part.end = start + end - 1; 767 entry->part.index = i + 1; 768 entry->part.type = mbr_parttype(dp[i].dp_typ); 769 entry->flags = dp[i].dp_flag; 770 entry->type.mbr = dp[i].dp_typ; 771 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 772 DEBUG("new MBR partition added"); 773 } 774 if (has_ext) { 775 table = ptable_ebrread(table, dev, dread); 776 /* FALLTHROUGH */ 777 } 778#endif /* LOADER_MBR_SUPPORT */ 779#endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 780out: 781 free(buf); 782 return (table); 783} 784 785void 786ptable_close(struct ptable *table) 787{ 788 struct pentry *entry; 789 790 while (!STAILQ_EMPTY(&table->entries)) { 791 entry = STAILQ_FIRST(&table->entries); 792 STAILQ_REMOVE_HEAD(&table->entries, entry); 793 free(entry); 794 } 795 free(table); 796} 797 798enum ptable_type 799ptable_gettype(const struct ptable *table) 800{ 801 802 return (table->type); 803} 804 805int 806ptable_getsize(const struct ptable *table, uint64_t *sizep) 807{ 808 uint64_t tmp = table->sectors * table->sectorsize; 809 810 if (tmp < table->sectors) 811 return (EOVERFLOW); 812 813 if (sizep != NULL) 814 *sizep = tmp; 815 return (0); 816} 817 818int 819ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 820{ 821 struct pentry *entry; 822 823 if (part == NULL || table == NULL) 824 return (EINVAL); 825 826 STAILQ_FOREACH(entry, &table->entries, entry) { 827 if (entry->part.index != index) 828 continue; 829 memcpy(part, &entry->part, sizeof(*part)); 830 return (0); 831 } 832 return (ENOENT); 833} 834 835/* 836 * Search for a slice with the following preferences: 837 * 838 * 1: Active FreeBSD slice 839 * 2: Non-active FreeBSD slice 840 * 3: Active Linux slice 841 * 4: non-active Linux slice 842 * 5: Active FAT/FAT32 slice 843 * 6: non-active FAT/FAT32 slice 844 */ 845#define PREF_RAWDISK 0 846#define PREF_FBSD_ACT 1 847#define PREF_FBSD 2 848#define PREF_LINUX_ACT 3 849#define PREF_LINUX 4 850#define PREF_DOS_ACT 5 851#define PREF_DOS 6 852#define PREF_NONE 7 853int 854ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 855{ 856 struct pentry *entry, *best; 857 int pref, preflevel; 858 859 if (part == NULL || table == NULL) 860 return (EINVAL); 861 862 best = NULL; 863 preflevel = pref = PREF_NONE; 864 STAILQ_FOREACH(entry, &table->entries, entry) { 865#ifdef LOADER_MBR_SUPPORT 866 if (table->type == PTABLE_MBR) { 867 switch (entry->type.mbr) { 868 case DOSPTYP_386BSD: 869 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 870 PREF_FBSD; 871 break; 872 case DOSPTYP_LINUX: 873 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 874 PREF_LINUX; 875 break; 876 case 0x01: /* DOS/Windows */ 877 case 0x04: 878 case 0x06: 879 case 0x0c: 880 case 0x0e: 881 case DOSPTYP_FAT32: 882 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 883 PREF_DOS; 884 break; 885 default: 886 pref = PREF_NONE; 887 } 888 } 889#endif /* LOADER_MBR_SUPPORT */ 890#ifdef LOADER_GPT_SUPPORT 891 if (table->type == PTABLE_GPT) { 892 if (entry->part.type == PART_DOS) 893 pref = PREF_DOS; 894 else if (entry->part.type == PART_FREEBSD_UFS || 895 entry->part.type == PART_FREEBSD_ZFS) 896 pref = PREF_FBSD; 897 else 898 pref = PREF_NONE; 899 } 900#endif /* LOADER_GPT_SUPPORT */ 901 if (pref < preflevel) { 902 preflevel = pref; 903 best = entry; 904 } 905 } 906 if (best != NULL) { 907 memcpy(part, &best->part, sizeof(*part)); 908 return (0); 909 } 910 return (ENOENT); 911} 912 913int 914ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 915{ 916 struct pentry *entry; 917 char name[32]; 918 int ret = 0; 919 920 name[0] = '\0'; 921 STAILQ_FOREACH(entry, &table->entries, entry) { 922#ifdef LOADER_MBR_SUPPORT 923 if (table->type == PTABLE_MBR) 924 sprintf(name, "s%d", entry->part.index); 925 else 926#endif 927#ifdef LOADER_GPT_SUPPORT 928 if (table->type == PTABLE_GPT) 929 sprintf(name, "p%d", entry->part.index); 930 else 931#endif 932#ifdef LOADER_VTOC8_SUPPORT 933 if (table->type == PTABLE_VTOC8) 934 sprintf(name, "%c", (uint8_t) 'a' + 935 entry->part.index); 936 else 937#endif 938 if (table->type == PTABLE_BSD) 939 sprintf(name, "%c", (uint8_t) 'a' + 940 entry->part.index); 941 if ((ret = iter(arg, name, &entry->part)) != 0) 942 return (ret); 943 } 944 return (ret); 945} 946