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