part.c revision 321265
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/10/sys/boot/common/part.c 321265 2017-07-20 00:48:04Z ngie $"); 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 <crc32.h> 41#include <part.h> 42#include <uuid.h> 43 44#ifdef PART_DEBUG 45#define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) 46#else 47#define DEBUG(fmt, args...) 48#endif 49 50#ifdef LOADER_GPT_SUPPORT 51#define MAXTBLSZ 64 52static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 53static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; 54static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 55static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 56static const uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD; 57static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 58static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 59static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 60static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 61static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 62#endif 63 64struct pentry { 65 struct ptable_entry part; 66 uint64_t flags; 67 union { 68 uint8_t bsd; 69 uint8_t mbr; 70 uuid_t gpt; 71 uint16_t vtoc8; 72 } type; 73 STAILQ_ENTRY(pentry) entry; 74}; 75 76struct ptable { 77 enum ptable_type type; 78 uint16_t sectorsize; 79 uint64_t sectors; 80 81 STAILQ_HEAD(, pentry) entries; 82}; 83 84static struct parttypes { 85 enum partition_type type; 86 const char *desc; 87} ptypes[] = { 88 { PART_UNKNOWN, "Unknown" }, 89 { PART_EFI, "EFI" }, 90 { PART_FREEBSD, "FreeBSD" }, 91 { PART_FREEBSD_BOOT, "FreeBSD boot" }, 92 { PART_FREEBSD_NANDFS, "FreeBSD nandfs" }, 93 { PART_FREEBSD_UFS, "FreeBSD UFS" }, 94 { PART_FREEBSD_ZFS, "FreeBSD ZFS" }, 95 { PART_FREEBSD_SWAP, "FreeBSD swap" }, 96 { PART_FREEBSD_VINUM, "FreeBSD vinum" }, 97 { PART_LINUX, "Linux" }, 98 { PART_LINUX_SWAP, "Linux swap" }, 99 { PART_DOS, "DOS/Windows" }, 100}; 101 102const char * 103parttype2str(enum partition_type type) 104{ 105 size_t i; 106 107 for (i = 0; i < sizeof(ptypes) / sizeof(ptypes[0]); i++) 108 if (ptypes[i].type == type) 109 return (ptypes[i].desc); 110 return (ptypes[0].desc); 111} 112 113#ifdef LOADER_GPT_SUPPORT 114static void 115uuid_letoh(uuid_t *uuid) 116{ 117 118 uuid->time_low = le32toh(uuid->time_low); 119 uuid->time_mid = le16toh(uuid->time_mid); 120 uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version); 121} 122 123static enum partition_type 124gpt_parttype(uuid_t type) 125{ 126 127 if (uuid_equal(&type, &gpt_uuid_efi, NULL)) 128 return (PART_EFI); 129 else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL)) 130 return (PART_DOS); 131 else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL)) 132 return (PART_FREEBSD_BOOT); 133 else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL)) 134 return (PART_FREEBSD_UFS); 135 else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL)) 136 return (PART_FREEBSD_ZFS); 137 else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL)) 138 return (PART_FREEBSD_SWAP); 139 else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL)) 140 return (PART_FREEBSD_VINUM); 141 else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL)) 142 return (PART_FREEBSD_NANDFS); 143 else if (uuid_equal(&type, &gpt_uuid_freebsd, NULL)) 144 return (PART_FREEBSD); 145 return (PART_UNKNOWN); 146} 147 148static struct gpt_hdr* 149gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last, 150 uint16_t sectorsize) 151{ 152 uint32_t sz, crc; 153 154 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) { 155 DEBUG("no GPT signature"); 156 return (NULL); 157 } 158 sz = le32toh(hdr->hdr_size); 159 if (sz < 92 || sz > sectorsize) { 160 DEBUG("invalid GPT header size: %d", sz); 161 return (NULL); 162 } 163 crc = le32toh(hdr->hdr_crc_self); 164 hdr->hdr_crc_self = 0; 165 if (crc32(hdr, sz) != crc) { 166 DEBUG("GPT header's CRC doesn't match"); 167 return (NULL); 168 } 169 hdr->hdr_crc_self = crc; 170 hdr->hdr_revision = le32toh(hdr->hdr_revision); 171 if (hdr->hdr_revision < GPT_HDR_REVISION) { 172 DEBUG("unsupported GPT revision %d", hdr->hdr_revision); 173 return (NULL); 174 } 175 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 176 if (hdr->hdr_lba_self != lba_self) { 177 DEBUG("self LBA doesn't match"); 178 return (NULL); 179 } 180 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 181 if (hdr->hdr_lba_alt == hdr->hdr_lba_self) { 182 DEBUG("invalid alternate LBA"); 183 return (NULL); 184 } 185 hdr->hdr_entries = le32toh(hdr->hdr_entries); 186 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 187 if (hdr->hdr_entries == 0 || 188 hdr->hdr_entsz < sizeof(struct gpt_ent) || 189 sectorsize % hdr->hdr_entsz != 0) { 190 DEBUG("invalid entry size or number of entries"); 191 return (NULL); 192 } 193 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 194 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 195 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 196 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 197 uuid_letoh(&hdr->hdr_uuid); 198 return (hdr); 199} 200 201static int 202gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size, 203 uint64_t lba_last) 204{ 205 struct gpt_ent *ent; 206 uint32_t i, cnt; 207 208 cnt = size / hdr->hdr_entsz; 209 if (hdr->hdr_entries <= cnt) { 210 cnt = hdr->hdr_entries; 211 /* Check CRC only when buffer size is enough for table. */ 212 if (hdr->hdr_crc_table != 213 crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz)) { 214 DEBUG("GPT table's CRC doesn't match"); 215 return (-1); 216 } 217 } 218 for (i = 0; i < cnt; i++) { 219 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); 220 uuid_letoh(&ent->ent_type); 221 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 222 continue; 223 ent->ent_lba_start = le64toh(ent->ent_lba_start); 224 ent->ent_lba_end = le64toh(ent->ent_lba_end); 225 } 226 return (0); 227} 228 229static struct ptable* 230ptable_gptread(struct ptable *table, void *dev, diskread_t dread) 231{ 232 struct pentry *entry; 233 struct gpt_hdr *phdr, hdr; 234 struct gpt_ent *ent; 235 u_char *buf, *tbl; 236 uint64_t offset; 237 int pri, sec; 238 size_t size, i; 239 240 buf = malloc(table->sectorsize); 241 if (buf == NULL) 242 return (NULL); 243 tbl = malloc(table->sectorsize * MAXTBLSZ); 244 if (tbl == NULL) { 245 free(buf); 246 return (NULL); 247 } 248 /* Read the primary GPT header. */ 249 if (dread(dev, buf, 1, 1) != 0) { 250 ptable_close(table); 251 table = NULL; 252 goto out; 253 } 254 pri = sec = 0; 255 /* Check the primary GPT header. */ 256 phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1, 257 table->sectorsize); 258 if (phdr != NULL) { 259 /* Read the primary GPT table. */ 260 size = MIN(MAXTBLSZ, (phdr->hdr_entries * phdr->hdr_entsz + 261 table->sectorsize - 1) / 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, (phdr->hdr_entries * 294 phdr->hdr_entsz + table->sectorsize - 1) / 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 DEBUG("GPT detected"); 310 size = MIN(hdr.hdr_entries * hdr.hdr_entsz, 311 MAXTBLSZ * table->sectorsize); 312 for (i = 0; i < size / hdr.hdr_entsz; i++) { 313 ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz); 314 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 315 continue; 316 entry = malloc(sizeof(*entry)); 317 if (entry == NULL) 318 break; 319 entry->part.start = ent->ent_lba_start; 320 entry->part.end = ent->ent_lba_end; 321 entry->part.index = i + 1; 322 entry->part.type = gpt_parttype(ent->ent_type); 323 entry->flags = le64toh(ent->ent_attr); 324 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 325 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 326 DEBUG("new GPT partition added"); 327 } 328out: 329 free(buf); 330 free(tbl); 331 return (table); 332} 333#endif /* LOADER_GPT_SUPPORT */ 334 335#ifdef LOADER_MBR_SUPPORT 336/* We do not need to support too many EBR partitions in the loader */ 337#define MAXEBRENTRIES 8 338static enum partition_type 339mbr_parttype(uint8_t type) 340{ 341 342 switch (type) { 343 case DOSPTYP_386BSD: 344 return (PART_FREEBSD); 345 case DOSPTYP_LINSWP: 346 return (PART_LINUX_SWAP); 347 case DOSPTYP_LINUX: 348 return (PART_LINUX); 349 case 0x01: 350 case 0x04: 351 case 0x06: 352 case 0x07: 353 case 0x0b: 354 case 0x0c: 355 case 0x0e: 356 return (PART_DOS); 357 } 358 return (PART_UNKNOWN); 359} 360 361static struct ptable* 362ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 363{ 364 struct dos_partition *dp; 365 struct pentry *e1, *entry; 366 uint32_t start, end, offset; 367 u_char *buf; 368 int i, index; 369 370 STAILQ_FOREACH(e1, &table->entries, entry) { 371 if (e1->type.mbr == DOSPTYP_EXT || 372 e1->type.mbr == DOSPTYP_EXTLBA) 373 break; 374 } 375 if (e1 == NULL) 376 return (table); 377 index = 5; 378 offset = e1->part.start; 379 buf = malloc(table->sectorsize); 380 if (buf == NULL) 381 return (table); 382 for (i = 0; i < MAXEBRENTRIES; i++) { 383#if 0 /* Some BIOSes return an incorrect number of sectors */ 384 if (offset >= table->sectors) 385 break; 386#endif 387 if (dread(dev, buf, 1, offset) != 0) 388 break; 389 dp = (struct dos_partition *)(buf + DOSPARTOFF); 390 if (dp[0].dp_typ == 0) 391 break; 392 start = le32toh(dp[0].dp_start); 393 if (dp[0].dp_typ == DOSPTYP_EXT && 394 dp[1].dp_typ == 0) { 395 offset = e1->part.start + start; 396 continue; 397 } 398 end = le32toh(dp[0].dp_size); 399 entry = malloc(sizeof(*entry)); 400 if (entry == NULL) 401 break; 402 entry->part.start = offset + start; 403 entry->part.end = entry->part.start + end - 1; 404 entry->part.index = index++; 405 entry->part.type = mbr_parttype(dp[0].dp_typ); 406 entry->flags = dp[0].dp_flag; 407 entry->type.mbr = dp[0].dp_typ; 408 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 409 DEBUG("new EBR partition added"); 410 if (dp[1].dp_typ == 0) 411 break; 412 offset = e1->part.start + le32toh(dp[1].dp_start); 413 } 414 free(buf); 415 return (table); 416} 417#endif /* LOADER_MBR_SUPPORT */ 418 419static enum partition_type 420bsd_parttype(uint8_t type) 421{ 422 423 switch (type) { 424 case FS_NANDFS: 425 return (PART_FREEBSD_NANDFS); 426 case FS_SWAP: 427 return (PART_FREEBSD_SWAP); 428 case FS_BSDFFS: 429 return (PART_FREEBSD_UFS); 430 case FS_VINUM: 431 return (PART_FREEBSD_VINUM); 432 case FS_ZFS: 433 return (PART_FREEBSD_ZFS); 434 } 435 return (PART_UNKNOWN); 436} 437 438static struct ptable* 439ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 440{ 441 struct disklabel *dl; 442 struct partition *part; 443 struct pentry *entry; 444 u_char *buf; 445 uint32_t raw_offset; 446 int i; 447 448 if (table->sectorsize < sizeof(struct disklabel)) { 449 DEBUG("Too small sectorsize"); 450 return (table); 451 } 452 buf = malloc(table->sectorsize); 453 if (buf == NULL) 454 return (table); 455 if (dread(dev, buf, 1, 1) != 0) { 456 DEBUG("read failed"); 457 ptable_close(table); 458 table = NULL; 459 goto out; 460 } 461 dl = (struct disklabel *)buf; 462 if (le32toh(dl->d_magic) != DISKMAGIC && 463 le32toh(dl->d_magic2) != DISKMAGIC) 464 goto out; 465 if (le32toh(dl->d_secsize) != table->sectorsize) { 466 DEBUG("unsupported sector size"); 467 goto out; 468 } 469 dl->d_npartitions = le16toh(dl->d_npartitions); 470 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 471 DEBUG("invalid number of partitions"); 472 goto out; 473 } 474 part = &dl->d_partitions[0]; 475 raw_offset = le32toh(part[RAW_PART].p_offset); 476 for (i = 0; i < dl->d_npartitions; i++, part++) { 477 if (i == RAW_PART) 478 continue; 479 if (part->p_size == 0) 480 continue; 481 entry = malloc(sizeof(*entry)); 482 if (entry == NULL) 483 break; 484 entry->part.start = le32toh(part->p_offset) - raw_offset; 485 entry->part.end = entry->part.start + 486 le32toh(part->p_size) + 1; 487 entry->part.type = bsd_parttype(part->p_fstype); 488 entry->part.index = i; /* starts from zero */ 489 entry->type.bsd = part->p_fstype; 490 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 491 DEBUG("new BSD partition added"); 492 } 493 table->type = PTABLE_BSD; 494out: 495 free(buf); 496 return (table); 497} 498 499#ifdef LOADER_VTOC8_SUPPORT 500static enum partition_type 501vtoc8_parttype(uint16_t type) 502{ 503 504 switch (type) { 505 case VTOC_TAG_FREEBSD_NANDFS: 506 return (PART_FREEBSD_NANDFS); 507 case VTOC_TAG_FREEBSD_SWAP: 508 return (PART_FREEBSD_SWAP); 509 case VTOC_TAG_FREEBSD_UFS: 510 return (PART_FREEBSD_UFS); 511 case VTOC_TAG_FREEBSD_VINUM: 512 return (PART_FREEBSD_VINUM); 513 case VTOC_TAG_FREEBSD_ZFS: 514 return (PART_FREEBSD_ZFS); 515 }; 516 return (PART_UNKNOWN); 517} 518 519static struct ptable* 520ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 521{ 522 struct pentry *entry; 523 struct vtoc8 *dl; 524 u_char *buf; 525 uint16_t sum, heads, sectors; 526 int i; 527 528 if (table->sectorsize != sizeof(struct vtoc8)) 529 return (table); 530 buf = malloc(table->sectorsize); 531 if (buf == NULL) 532 return (table); 533 if (dread(dev, buf, 1, 0) != 0) { 534 DEBUG("read failed"); 535 ptable_close(table); 536 table = NULL; 537 goto out; 538 } 539 dl = (struct vtoc8 *)buf; 540 /* Check the sum */ 541 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 542 sum ^= be16dec(buf + i); 543 if (sum != 0) { 544 DEBUG("incorrect checksum"); 545 goto out; 546 } 547 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 548 DEBUG("invalid number of entries"); 549 goto out; 550 } 551 sectors = be16toh(dl->nsecs); 552 heads = be16toh(dl->nheads); 553 if (sectors * heads == 0) { 554 DEBUG("invalid geometry"); 555 goto out; 556 } 557 for (i = 0; i < VTOC8_NPARTS; i++) { 558 dl->part[i].tag = be16toh(dl->part[i].tag); 559 if (i == VTOC_RAW_PART || 560 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 561 continue; 562 entry = malloc(sizeof(*entry)); 563 if (entry == NULL) 564 break; 565 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 566 entry->part.end = be32toh(dl->map[i].nblks) + 567 entry->part.start - 1; 568 entry->part.type = vtoc8_parttype(dl->part[i].tag); 569 entry->part.index = i; /* starts from zero */ 570 entry->type.vtoc8 = dl->part[i].tag; 571 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 572 DEBUG("new VTOC8 partition added"); 573 } 574 table->type = PTABLE_VTOC8; 575out: 576 free(buf); 577 return (table); 578 579} 580#endif /* LOADER_VTOC8_SUPPORT */ 581 582struct ptable* 583ptable_open(void *dev, off_t sectors, uint16_t sectorsize, 584 diskread_t *dread) 585{ 586 struct dos_partition *dp; 587 struct ptable *table; 588 u_char *buf; 589 int i, count; 590#ifdef LOADER_MBR_SUPPORT 591 struct pentry *entry; 592 uint32_t start, end; 593 int has_ext; 594#endif 595 table = NULL; 596 buf = malloc(sectorsize); 597 if (buf == NULL) 598 return (NULL); 599 /* First, read the MBR. */ 600 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 601 DEBUG("read failed"); 602 goto out; 603 } 604 605 table = malloc(sizeof(*table)); 606 if (table == NULL) 607 goto out; 608 table->sectors = sectors; 609 table->sectorsize = sectorsize; 610 table->type = PTABLE_NONE; 611 STAILQ_INIT(&table->entries); 612 613#ifdef LOADER_VTOC8_SUPPORT 614 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 615 if (ptable_vtoc8read(table, dev, dread) == NULL) { 616 /* Read error. */ 617 table = NULL; 618 goto out; 619 } else if (table->type == PTABLE_VTOC8) 620 goto out; 621 } 622#endif 623 /* Check the BSD label. */ 624 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 625 table = NULL; 626 goto out; 627 } else if (table->type == PTABLE_BSD) 628 goto out; 629 630#if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 631 /* Check the MBR magic. */ 632 if (buf[DOSMAGICOFFSET] != 0x55 || 633 buf[DOSMAGICOFFSET + 1] != 0xaa) { 634 DEBUG("magic sequence not found"); 635#if defined(LOADER_GPT_SUPPORT) 636 /* There is no PMBR, check that we have backup GPT */ 637 table->type = PTABLE_GPT; 638 table = ptable_gptread(table, dev, dread); 639#endif 640 goto out; 641 } 642 /* Check that we have PMBR. Also do some validation. */ 643 dp = (struct dos_partition *)(buf + DOSPARTOFF); 644 for (i = 0, count = 0; i < NDOSPART; i++) { 645 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 646 DEBUG("invalid partition flag %x", dp[i].dp_flag); 647 goto out; 648 } 649#ifdef LOADER_GPT_SUPPORT 650 if (dp[i].dp_typ == DOSPTYP_PMBR) { 651 table->type = PTABLE_GPT; 652 DEBUG("PMBR detected"); 653 } 654#endif 655 if (dp[i].dp_typ != 0) 656 count++; 657 } 658 /* Do we have some invalid values? */ 659 if (table->type == PTABLE_GPT && count > 1) { 660 if (dp[1].dp_typ != DOSPTYP_HFS) { 661 table->type = PTABLE_NONE; 662 DEBUG("Incorrect PMBR, ignore it"); 663 } else { 664 DEBUG("Bootcamp detected"); 665 } 666 } 667#ifdef LOADER_GPT_SUPPORT 668 if (table->type == PTABLE_GPT) { 669 table = ptable_gptread(table, dev, dread); 670 goto out; 671 } 672#endif 673#ifdef LOADER_MBR_SUPPORT 674 /* Read MBR. */ 675 table->type = PTABLE_MBR; 676 for (i = has_ext = 0; i < NDOSPART; i++) { 677 if (dp[i].dp_typ == 0) 678 continue; 679 start = le32dec(&(dp[i].dp_start)); 680 end = le32dec(&(dp[i].dp_size)); 681 if (start == 0 || end == 0) 682 continue; 683#if 0 /* Some BIOSes return an incorrect number of sectors */ 684 if (start + end - 1 >= sectors) 685 continue; /* XXX: ignore */ 686#endif 687 if (dp[i].dp_typ == DOSPTYP_EXT || 688 dp[i].dp_typ == DOSPTYP_EXTLBA) 689 has_ext = 1; 690 entry = malloc(sizeof(*entry)); 691 if (entry == NULL) 692 break; 693 entry->part.start = start; 694 entry->part.end = start + end - 1; 695 entry->part.index = i + 1; 696 entry->part.type = mbr_parttype(dp[i].dp_typ); 697 entry->flags = dp[i].dp_flag; 698 entry->type.mbr = dp[i].dp_typ; 699 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 700 DEBUG("new MBR partition added"); 701 } 702 if (has_ext) { 703 table = ptable_ebrread(table, dev, dread); 704 /* FALLTHROUGH */ 705 } 706#endif /* LOADER_MBR_SUPPORT */ 707#endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 708out: 709 free(buf); 710 return (table); 711} 712 713void 714ptable_close(struct ptable *table) 715{ 716 struct pentry *entry; 717 718 while (!STAILQ_EMPTY(&table->entries)) { 719 entry = STAILQ_FIRST(&table->entries); 720 STAILQ_REMOVE_HEAD(&table->entries, entry); 721 free(entry); 722 } 723 free(table); 724} 725 726enum ptable_type 727ptable_gettype(const struct ptable *table) 728{ 729 730 return (table->type); 731} 732 733int 734ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 735{ 736 struct pentry *entry; 737 738 if (part == NULL || table == NULL) 739 return (EINVAL); 740 741 STAILQ_FOREACH(entry, &table->entries, entry) { 742 if (entry->part.index != index) 743 continue; 744 memcpy(part, &entry->part, sizeof(*part)); 745 return (0); 746 } 747 return (ENOENT); 748} 749 750/* 751 * Search for a slice with the following preferences: 752 * 753 * 1: Active FreeBSD slice 754 * 2: Non-active FreeBSD slice 755 * 3: Active Linux slice 756 * 4: non-active Linux slice 757 * 5: Active FAT/FAT32 slice 758 * 6: non-active FAT/FAT32 slice 759 */ 760#define PREF_RAWDISK 0 761#define PREF_FBSD_ACT 1 762#define PREF_FBSD 2 763#define PREF_LINUX_ACT 3 764#define PREF_LINUX 4 765#define PREF_DOS_ACT 5 766#define PREF_DOS 6 767#define PREF_NONE 7 768int 769ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 770{ 771 struct pentry *entry, *best; 772 int pref, preflevel; 773 774 if (part == NULL || table == NULL) 775 return (EINVAL); 776 777 best = NULL; 778 preflevel = pref = PREF_NONE; 779 STAILQ_FOREACH(entry, &table->entries, entry) { 780#ifdef LOADER_MBR_SUPPORT 781 if (table->type == PTABLE_MBR) { 782 switch (entry->type.mbr) { 783 case DOSPTYP_386BSD: 784 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 785 PREF_FBSD; 786 break; 787 case DOSPTYP_LINUX: 788 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 789 PREF_LINUX; 790 break; 791 case 0x01: /* DOS/Windows */ 792 case 0x04: 793 case 0x06: 794 case 0x0c: 795 case 0x0e: 796 case DOSPTYP_FAT32: 797 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 798 PREF_DOS; 799 break; 800 default: 801 pref = PREF_NONE; 802 } 803 } 804#endif /* LOADER_MBR_SUPPORT */ 805#ifdef LOADER_GPT_SUPPORT 806 if (table->type == PTABLE_GPT) { 807 if (entry->part.type == PART_DOS) 808 pref = PREF_DOS; 809 else if (entry->part.type == PART_FREEBSD_UFS || 810 entry->part.type == PART_FREEBSD_ZFS) 811 pref = PREF_FBSD; 812 else 813 pref = PREF_NONE; 814 } 815#endif /* LOADER_GPT_SUPPORT */ 816 if (pref < preflevel) { 817 preflevel = pref; 818 best = entry; 819 } 820 } 821 if (best != NULL) { 822 memcpy(part, &best->part, sizeof(*part)); 823 return (0); 824 } 825 return (ENOENT); 826} 827 828void 829ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 830{ 831 struct pentry *entry; 832 char name[32]; 833 834 name[0] = '\0'; 835 STAILQ_FOREACH(entry, &table->entries, entry) { 836#ifdef LOADER_MBR_SUPPORT 837 if (table->type == PTABLE_MBR) 838 sprintf(name, "s%d", entry->part.index); 839 else 840#endif 841#ifdef LOADER_GPT_SUPPORT 842 if (table->type == PTABLE_GPT) 843 sprintf(name, "p%d", entry->part.index); 844 else 845#endif 846#ifdef LOADER_VTOC8_SUPPORT 847 if (table->type == PTABLE_VTOC8) 848 sprintf(name, "%c", (u_char) 'a' + 849 entry->part.index); 850 else 851#endif 852 if (table->type == PTABLE_BSD) 853 sprintf(name, "%c", (u_char) 'a' + 854 entry->part.index); 855 iter(arg, name, &entry->part); 856 } 857} 858 859