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("$FreeBSD$"); 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 54 static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 55 static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; 56 static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 57 static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 58 static const uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD; 59 static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 60 static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 61 static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 62 static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 63 static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 64 #endif 65 66 struct 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 78 struct ptable { 79 enum ptable_type type; 80 uint16_t sectorsize; 81 uint64_t sectors; 82 83 STAILQ_HEAD(, pentry) entries; 84 }; 85 86 static 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 }; 104 105 const char * 106 parttype2str(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 117 static void 118 uuid_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 } 125 126 static enum partition_type 127 gpt_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 } 150 151 static struct gpt_hdr * 152 gpt_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 } 203 204 static int 205 gpt_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 } 231 232 static struct ptable * 233 ptable_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 table->sectors = hdr.hdr_lba_alt + 1; 327 328 for (i = 0; i < size / hdr.hdr_entsz; i++) { 329 ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz); 330 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 331 continue; 332 333 /* Simple sanity checks. */ 334 if (ent->ent_lba_start < hdr.hdr_lba_start || 335 ent->ent_lba_end > hdr.hdr_lba_end || 336 ent->ent_lba_start > ent->ent_lba_end) 337 continue; 338 339 entry = malloc(sizeof(*entry)); 340 if (entry == NULL) 341 break; 342 entry->part.start = ent->ent_lba_start; 343 entry->part.end = ent->ent_lba_end; 344 entry->part.index = i + 1; 345 entry->part.type = gpt_parttype(ent->ent_type); 346 entry->flags = le64toh(ent->ent_attr); 347 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 348 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 349 DEBUG("new GPT partition added"); 350 } 351 out: 352 free(buf); 353 free(tbl); 354 return (table); 355 } 356 #endif /* LOADER_GPT_SUPPORT */ 357 358 #ifdef LOADER_MBR_SUPPORT 359 /* We do not need to support too many EBR partitions in the loader */ 360 #define MAXEBRENTRIES 8 361 static enum partition_type 362 mbr_parttype(uint8_t type) 363 { 364 365 switch (type) { 366 case DOSPTYP_386BSD: 367 return (PART_FREEBSD); 368 case DOSPTYP_LINSWP: 369 return (PART_LINUX_SWAP); 370 case DOSPTYP_LINUX: 371 return (PART_LINUX); 372 case 0x01: 373 case 0x04: 374 case 0x06: 375 case 0x07: 376 case 0x0b: 377 case 0x0c: 378 case 0x0e: 379 return (PART_DOS); 380 } 381 return (PART_UNKNOWN); 382 } 383 384 static struct ptable * 385 ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 386 { 387 struct dos_partition *dp; 388 struct pentry *e1, *entry; 389 uint32_t start, end, offset; 390 u_char *buf; 391 int i, index; 392 393 STAILQ_FOREACH(e1, &table->entries, entry) { 394 if (e1->type.mbr == DOSPTYP_EXT || 395 e1->type.mbr == DOSPTYP_EXTLBA) 396 break; 397 } 398 if (e1 == NULL) 399 return (table); 400 index = 5; 401 offset = e1->part.start; 402 buf = malloc(table->sectorsize); 403 if (buf == NULL) 404 return (table); 405 DEBUG("EBR detected"); 406 for (i = 0; i < MAXEBRENTRIES; i++) { 407 #if 0 /* Some BIOSes return an incorrect number of sectors */ 408 if (offset >= table->sectors) 409 break; 410 #endif 411 if (dread(dev, buf, 1, offset) != 0) 412 break; 413 dp = (struct dos_partition *)(buf + DOSPARTOFF); 414 if (dp[0].dp_typ == 0) 415 break; 416 start = le32toh(dp[0].dp_start); 417 if (dp[0].dp_typ == DOSPTYP_EXT && 418 dp[1].dp_typ == 0) { 419 offset = e1->part.start + start; 420 continue; 421 } 422 end = le32toh(dp[0].dp_size); 423 entry = malloc(sizeof(*entry)); 424 if (entry == NULL) 425 break; 426 entry->part.start = offset + start; 427 entry->part.end = entry->part.start + end - 1; 428 entry->part.index = index++; 429 entry->part.type = mbr_parttype(dp[0].dp_typ); 430 entry->flags = dp[0].dp_flag; 431 entry->type.mbr = dp[0].dp_typ; 432 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 433 DEBUG("new EBR partition added"); 434 if (dp[1].dp_typ == 0) 435 break; 436 offset = e1->part.start + le32toh(dp[1].dp_start); 437 } 438 free(buf); 439 return (table); 440 } 441 #endif /* LOADER_MBR_SUPPORT */ 442 443 static enum partition_type 444 bsd_parttype(uint8_t type) 445 { 446 447 switch (type) { 448 case FS_NANDFS: 449 return (PART_FREEBSD_NANDFS); 450 case FS_SWAP: 451 return (PART_FREEBSD_SWAP); 452 case FS_BSDFFS: 453 return (PART_FREEBSD_UFS); 454 case FS_VINUM: 455 return (PART_FREEBSD_VINUM); 456 case FS_ZFS: 457 return (PART_FREEBSD_ZFS); 458 } 459 return (PART_UNKNOWN); 460 } 461 462 static struct ptable * 463 ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 464 { 465 struct disklabel *dl; 466 struct partition *part; 467 struct pentry *entry; 468 uint8_t *buf; 469 uint32_t raw_offset; 470 int i; 471 472 if (table->sectorsize < sizeof(struct disklabel)) { 473 DEBUG("Too small sectorsize"); 474 return (table); 475 } 476 buf = malloc(table->sectorsize); 477 if (buf == NULL) 478 return (table); 479 if (dread(dev, buf, 1, 1) != 0) { 480 DEBUG("read failed"); 481 ptable_close(table); 482 table = NULL; 483 goto out; 484 } 485 dl = (struct disklabel *)buf; 486 if (le32toh(dl->d_magic) != DISKMAGIC && 487 le32toh(dl->d_magic2) != DISKMAGIC) 488 goto out; 489 if (le32toh(dl->d_secsize) != table->sectorsize) { 490 DEBUG("unsupported sector size"); 491 goto out; 492 } 493 dl->d_npartitions = le16toh(dl->d_npartitions); 494 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 495 DEBUG("invalid number of partitions"); 496 goto out; 497 } 498 DEBUG("BSD detected"); 499 part = &dl->d_partitions[0]; 500 raw_offset = le32toh(part[RAW_PART].p_offset); 501 for (i = 0; i < dl->d_npartitions; i++, part++) { 502 if (i == RAW_PART) 503 continue; 504 if (part->p_size == 0) 505 continue; 506 entry = malloc(sizeof(*entry)); 507 if (entry == NULL) 508 break; 509 entry->part.start = le32toh(part->p_offset) - raw_offset; 510 entry->part.end = entry->part.start + 511 le32toh(part->p_size) - 1; 512 entry->part.type = bsd_parttype(part->p_fstype); 513 entry->part.index = i; /* starts from zero */ 514 entry->type.bsd = part->p_fstype; 515 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 516 DEBUG("new BSD partition added"); 517 } 518 table->type = PTABLE_BSD; 519 out: 520 free(buf); 521 return (table); 522 } 523 524 #ifdef LOADER_VTOC8_SUPPORT 525 static enum partition_type 526 vtoc8_parttype(uint16_t type) 527 { 528 529 switch (type) { 530 case VTOC_TAG_FREEBSD_NANDFS: 531 return (PART_FREEBSD_NANDFS); 532 case VTOC_TAG_FREEBSD_SWAP: 533 return (PART_FREEBSD_SWAP); 534 case VTOC_TAG_FREEBSD_UFS: 535 return (PART_FREEBSD_UFS); 536 case VTOC_TAG_FREEBSD_VINUM: 537 return (PART_FREEBSD_VINUM); 538 case VTOC_TAG_FREEBSD_ZFS: 539 return (PART_FREEBSD_ZFS); 540 } 541 return (PART_UNKNOWN); 542 } 543 544 static struct ptable * 545 ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 546 { 547 struct pentry *entry; 548 struct vtoc8 *dl; 549 uint8_t *buf; 550 uint16_t sum, heads, sectors; 551 int i; 552 553 if (table->sectorsize != sizeof(struct vtoc8)) 554 return (table); 555 buf = malloc(table->sectorsize); 556 if (buf == NULL) 557 return (table); 558 if (dread(dev, buf, 1, 0) != 0) { 559 DEBUG("read failed"); 560 ptable_close(table); 561 table = NULL; 562 goto out; 563 } 564 dl = (struct vtoc8 *)buf; 565 /* Check the sum */ 566 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 567 sum ^= be16dec(buf + i); 568 if (sum != 0) { 569 DEBUG("incorrect checksum"); 570 goto out; 571 } 572 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 573 DEBUG("invalid number of entries"); 574 goto out; 575 } 576 sectors = be16toh(dl->nsecs); 577 heads = be16toh(dl->nheads); 578 if (sectors * heads == 0) { 579 DEBUG("invalid geometry"); 580 goto out; 581 } 582 DEBUG("VTOC8 detected"); 583 for (i = 0; i < VTOC8_NPARTS; i++) { 584 dl->part[i].tag = be16toh(dl->part[i].tag); 585 if (i == VTOC_RAW_PART || 586 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 587 continue; 588 entry = malloc(sizeof(*entry)); 589 if (entry == NULL) 590 break; 591 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 592 entry->part.end = be32toh(dl->map[i].nblks) + 593 entry->part.start - 1; 594 entry->part.type = vtoc8_parttype(dl->part[i].tag); 595 entry->part.index = i; /* starts from zero */ 596 entry->type.vtoc8 = dl->part[i].tag; 597 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 598 DEBUG("new VTOC8 partition added"); 599 } 600 table->type = PTABLE_VTOC8; 601 out: 602 free(buf); 603 return (table); 604 605 } 606 #endif /* LOADER_VTOC8_SUPPORT */ 607 608 #define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / table->sectorsize) 609 610 static struct ptable * 611 ptable_iso9660read(struct ptable *table, void *dev, diskread_t dread) 612 { 613 uint8_t *buf; 614 struct iso_primary_descriptor *vd; 615 struct pentry *entry; 616 617 buf = malloc(table->sectorsize); 618 if (buf == NULL) 619 return (table); 620 621 if (dread(dev, buf, 1, cdb2devb(16)) != 0) { 622 DEBUG("read failed"); 623 ptable_close(table); 624 table = NULL; 625 goto out; 626 } 627 vd = (struct iso_primary_descriptor *)buf; 628 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0) 629 goto out; 630 631 entry = malloc(sizeof(*entry)); 632 if (entry == NULL) 633 goto out; 634 entry->part.start = 0; 635 entry->part.end = table->sectors; 636 entry->part.type = PART_ISO9660; 637 entry->part.index = 0; 638 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 639 640 table->type = PTABLE_ISO9660; 641 642 out: 643 free(buf); 644 return (table); 645 } 646 647 struct ptable * 648 ptable_open(void *dev, uint64_t sectors, uint16_t sectorsize, 649 diskread_t *dread) 650 { 651 struct dos_partition *dp; 652 struct ptable *table; 653 uint8_t *buf; 654 int i, count; 655 #ifdef LOADER_MBR_SUPPORT 656 struct pentry *entry; 657 uint32_t start, end; 658 int has_ext; 659 #endif 660 table = NULL; 661 buf = malloc(sectorsize); 662 if (buf == NULL) 663 return (NULL); 664 /* First, read the MBR. */ 665 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 666 DEBUG("read failed"); 667 goto out; 668 } 669 670 table = malloc(sizeof(*table)); 671 if (table == NULL) 672 goto out; 673 table->sectors = sectors; 674 table->sectorsize = sectorsize; 675 table->type = PTABLE_NONE; 676 STAILQ_INIT(&table->entries); 677 678 if (ptable_iso9660read(table, dev, dread) == NULL) { 679 /* Read error. */ 680 table = NULL; 681 goto out; 682 } else if (table->type == PTABLE_ISO9660) 683 goto out; 684 685 #ifdef LOADER_VTOC8_SUPPORT 686 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 687 if (ptable_vtoc8read(table, dev, dread) == NULL) { 688 /* Read error. */ 689 table = NULL; 690 goto out; 691 } else if (table->type == PTABLE_VTOC8) 692 goto out; 693 } 694 #endif 695 /* Check the BSD label. */ 696 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 697 table = NULL; 698 goto out; 699 } else if (table->type == PTABLE_BSD) 700 goto out; 701 702 #if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 703 /* Check the MBR magic. */ 704 if (buf[DOSMAGICOFFSET] != 0x55 || 705 buf[DOSMAGICOFFSET + 1] != 0xaa) { 706 DEBUG("magic sequence not found"); 707 #if defined(LOADER_GPT_SUPPORT) 708 /* There is no PMBR, check that we have backup GPT */ 709 table->type = PTABLE_GPT; 710 table = ptable_gptread(table, dev, dread); 711 #endif 712 goto out; 713 } 714 /* Check that we have PMBR. Also do some validation. */ 715 dp = (struct dos_partition *)(buf + DOSPARTOFF); 716 for (i = 0, count = 0; i < NDOSPART; i++) { 717 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 718 DEBUG("invalid partition flag %x", dp[i].dp_flag); 719 goto out; 720 } 721 #ifdef LOADER_GPT_SUPPORT 722 if (dp[i].dp_typ == DOSPTYP_PMBR) { 723 table->type = PTABLE_GPT; 724 DEBUG("PMBR detected"); 725 } 726 #endif 727 if (dp[i].dp_typ != 0) 728 count++; 729 } 730 /* Do we have some invalid values? */ 731 if (table->type == PTABLE_GPT && count > 1) { 732 if (dp[1].dp_typ != DOSPTYP_HFS) { 733 table->type = PTABLE_NONE; 734 DEBUG("Incorrect PMBR, ignore it"); 735 } else { 736 DEBUG("Bootcamp detected"); 737 } 738 } 739 #ifdef LOADER_GPT_SUPPORT 740 if (table->type == PTABLE_GPT) { 741 table = ptable_gptread(table, dev, dread); 742 goto out; 743 } 744 #endif 745 #ifdef LOADER_MBR_SUPPORT 746 /* Read MBR. */ 747 DEBUG("MBR detected"); 748 table->type = PTABLE_MBR; 749 for (i = has_ext = 0; i < NDOSPART; i++) { 750 if (dp[i].dp_typ == 0) 751 continue; 752 start = le32dec(&(dp[i].dp_start)); 753 end = le32dec(&(dp[i].dp_size)); 754 if (start == 0 || end == 0) 755 continue; 756 #if 0 /* Some BIOSes return an incorrect number of sectors */ 757 if (start + end - 1 >= sectors) 758 continue; /* XXX: ignore */ 759 #endif 760 if (dp[i].dp_typ == DOSPTYP_EXT || 761 dp[i].dp_typ == DOSPTYP_EXTLBA) 762 has_ext = 1; 763 entry = malloc(sizeof(*entry)); 764 if (entry == NULL) 765 break; 766 entry->part.start = start; 767 entry->part.end = start + end - 1; 768 entry->part.index = i + 1; 769 entry->part.type = mbr_parttype(dp[i].dp_typ); 770 entry->flags = dp[i].dp_flag; 771 entry->type.mbr = dp[i].dp_typ; 772 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 773 DEBUG("new MBR partition added"); 774 } 775 if (has_ext) { 776 table = ptable_ebrread(table, dev, dread); 777 /* FALLTHROUGH */ 778 } 779 #endif /* LOADER_MBR_SUPPORT */ 780 #endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 781 out: 782 free(buf); 783 return (table); 784 } 785 786 void 787 ptable_close(struct ptable *table) 788 { 789 struct pentry *entry; 790 791 if (table == NULL) 792 return; 793 794 while (!STAILQ_EMPTY(&table->entries)) { 795 entry = STAILQ_FIRST(&table->entries); 796 STAILQ_REMOVE_HEAD(&table->entries, entry); 797 free(entry); 798 } 799 free(table); 800 } 801 802 enum ptable_type 803 ptable_gettype(const struct ptable *table) 804 { 805 806 return (table->type); 807 } 808 809 int 810 ptable_getsize(const struct ptable *table, uint64_t *sizep) 811 { 812 uint64_t tmp = table->sectors * table->sectorsize; 813 814 if (tmp < table->sectors) 815 return (EOVERFLOW); 816 817 if (sizep != NULL) 818 *sizep = tmp; 819 return (0); 820 } 821 822 int 823 ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 824 { 825 struct pentry *entry; 826 827 if (part == NULL || table == NULL) 828 return (EINVAL); 829 830 STAILQ_FOREACH(entry, &table->entries, entry) { 831 if (entry->part.index != index) 832 continue; 833 memcpy(part, &entry->part, sizeof(*part)); 834 return (0); 835 } 836 return (ENOENT); 837 } 838 839 /* 840 * Search for a slice with the following preferences: 841 * 842 * 1: Active FreeBSD slice 843 * 2: Non-active FreeBSD slice 844 * 3: Active Linux slice 845 * 4: non-active Linux slice 846 * 5: Active FAT/FAT32 slice 847 * 6: non-active FAT/FAT32 slice 848 */ 849 #define PREF_RAWDISK 0 850 #define PREF_FBSD_ACT 1 851 #define PREF_FBSD 2 852 #define PREF_LINUX_ACT 3 853 #define PREF_LINUX 4 854 #define PREF_DOS_ACT 5 855 #define PREF_DOS 6 856 #define PREF_NONE 7 857 int 858 ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 859 { 860 struct pentry *entry, *best; 861 int pref, preflevel; 862 863 if (part == NULL || table == NULL) 864 return (EINVAL); 865 866 best = NULL; 867 preflevel = pref = PREF_NONE; 868 STAILQ_FOREACH(entry, &table->entries, entry) { 869 #ifdef LOADER_MBR_SUPPORT 870 if (table->type == PTABLE_MBR) { 871 switch (entry->type.mbr) { 872 case DOSPTYP_386BSD: 873 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 874 PREF_FBSD; 875 break; 876 case DOSPTYP_LINUX: 877 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 878 PREF_LINUX; 879 break; 880 case 0x01: /* DOS/Windows */ 881 case 0x04: 882 case 0x06: 883 case 0x0c: 884 case 0x0e: 885 case DOSPTYP_FAT32: 886 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 887 PREF_DOS; 888 break; 889 default: 890 pref = PREF_NONE; 891 } 892 } 893 #endif /* LOADER_MBR_SUPPORT */ 894 #ifdef LOADER_GPT_SUPPORT 895 if (table->type == PTABLE_GPT) { 896 if (entry->part.type == PART_DOS) 897 pref = PREF_DOS; 898 else if (entry->part.type == PART_FREEBSD_UFS || 899 entry->part.type == PART_FREEBSD_ZFS) 900 pref = PREF_FBSD; 901 else 902 pref = PREF_NONE; 903 } 904 #endif /* LOADER_GPT_SUPPORT */ 905 if (pref < preflevel) { 906 preflevel = pref; 907 best = entry; 908 } 909 } 910 if (best != NULL) { 911 memcpy(part, &best->part, sizeof(*part)); 912 return (0); 913 } 914 return (ENOENT); 915 } 916 917 int 918 ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 919 { 920 struct pentry *entry; 921 char name[32]; 922 int ret = 0; 923 924 name[0] = '\0'; 925 STAILQ_FOREACH(entry, &table->entries, entry) { 926 #ifdef LOADER_MBR_SUPPORT 927 if (table->type == PTABLE_MBR) 928 sprintf(name, "s%d", entry->part.index); 929 else 930 #endif 931 #ifdef LOADER_GPT_SUPPORT 932 if (table->type == PTABLE_GPT) 933 sprintf(name, "p%d", entry->part.index); 934 else 935 #endif 936 #ifdef LOADER_VTOC8_SUPPORT 937 if (table->type == PTABLE_VTOC8) 938 sprintf(name, "%c", (uint8_t) 'a' + 939 entry->part.index); 940 else 941 #endif 942 if (table->type == PTABLE_BSD) 943 sprintf(name, "%c", (uint8_t) 'a' + 944 entry->part.index); 945 if ((ret = iter(arg, name, &entry->part)) != 0) 946 return (ret); 947 } 948 return (ret); 949 } 950