gpt.c revision 263466
1/*- 2 * Copyright (c) 2014 Juniper Networks, Inc. 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 AUTHOR 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 AUTHOR 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: user/marcel/mkimg/gpt.c 263466 2014-03-21 05:30:27Z marcel $"); 29 30#include <sys/types.h> 31#include <sys/diskmbr.h> 32#include <sys/endian.h> 33#include <sys/errno.h> 34#include <sys/gpt.h> 35#include <stddef.h> 36#include <stdint.h> 37#include <stdlib.h> 38#include <string.h> 39#include <unistd.h> 40#include <uuid.h> 41 42#include "mkimg.h" 43#include "scheme.h" 44 45static uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 46 47static struct mkimg_alias gpt_aliases[] = { 48 { "efi", ALIAS_PTR2TYPE(&gpt_uuid_efi) }, 49 { NULL, 0 } 50}; 51 52/* CRC32 code derived from work by Gary S. Brown. */ 53static const uint32_t crc32_tab[] = { 54 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 55 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 56 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 57 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 58 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 59 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 60 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 61 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 62 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 63 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 64 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 65 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 66 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 67 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 68 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 69 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 70 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 71 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 72 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 73 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 74 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 75 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 76 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 77 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 78 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 79 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 80 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 81 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 82 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 83 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 84 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 85 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 86 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 87 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 88 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 89 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 90 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 91 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 92 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 93 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 94 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 95 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 96 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d 97}; 98 99static uint32_t 100crc32(const void *buf, size_t sz) 101{ 102 const uint8_t *p = (const uint8_t *)buf; 103 uint32_t crc = ~0U; 104 105 while (sz--) 106 crc = crc32_tab[(crc ^ *p++) & 0xff] ^ (crc >> 8); 107 return (crc ^ ~0U); 108} 109 110static u_int 111gpt_tblsz(u_int parts, u_int secsz) 112{ 113 u_int ents; 114 115 ents = secsz / sizeof(struct gpt_ent); 116 return ((parts + ents - 1) / ents); 117} 118 119static u_int 120gpt_metadata(u_int where, u_int parts, u_int secsz) 121{ 122 u_int secs; 123 124 if (where != SCHEME_META_IMG_START && where != SCHEME_META_IMG_END) 125 return (0); 126 127 secs = gpt_tblsz(parts, secsz); 128 secs += (where == SCHEME_META_IMG_START) ? 2 : 1; 129 return (secs); 130} 131 132static int 133gpt_filewrite(int fd, off_t ofs, void *buf, ssize_t bufsz) 134{ 135 136 if (lseek(fd, ofs, SEEK_SET) != ofs) 137 return (errno); 138 if (write(fd, buf, bufsz) != bufsz) 139 return (errno); 140 return (0); 141} 142 143static int 144gpt_write_pmbr(int fd, off_t nblocks, u_int secsz) 145{ 146 u_char *pmbr; 147 uint32_t secs; 148 int error; 149 150 secs = (nblocks > UINT32_MAX) ? UINT32_MAX : nblocks; 151 152 pmbr = malloc(secsz); 153 if (pmbr == NULL) 154 return (errno); 155 memset(pmbr, 0, secsz); 156 pmbr[DOSPARTOFF + 2] = 2; 157 pmbr[DOSPARTOFF + 4] = 0xee; 158 pmbr[DOSPARTOFF + 5] = 0xff; 159 pmbr[DOSPARTOFF + 6] = 0xff; 160 pmbr[DOSPARTOFF + 7] = 0xff; 161 le32enc(pmbr + DOSPARTOFF + 8, 1); 162 le32enc(pmbr + DOSPARTOFF + 12, secs); 163 le16enc(pmbr + DOSMAGICOFFSET, DOSMAGIC); 164 error = gpt_filewrite(fd, 0, pmbr, secsz); 165 free(pmbr); 166 return (error); 167} 168 169static struct gpt_ent * 170gpt_mktbl(u_int tblsz, u_int secsz) 171{ 172 uuid_t uuid; 173 struct gpt_ent *tbl, *ent; 174 struct part *part; 175 uint64_t limit; 176 int c, idx; 177 178 tbl = calloc(tblsz, secsz); 179 if (tbl == NULL) 180 return (NULL); 181 182 STAILQ_FOREACH(part, &partlist, link) { 183 ent = tbl + part->index; 184 uuid_enc_le(&ent->ent_type, ALIAS_TYPE2PTR(part->type)); 185 uuidgen(&uuid, 1); 186 uuid_enc_le(&ent->ent_uuid, &uuid); 187 le64enc(&ent->ent_lba_start, part->offset / secsz); 188 limit = (part->offset + part->size) / secsz; 189 le64enc(&ent->ent_lba_end, limit - 1); 190 if (part->label != NULL) { 191 idx = 0; 192 while ((c = part->label[idx]) != '\0') { 193 le16enc(ent->ent_name + idx, c); 194 idx++; 195 } 196 } 197 } 198 return (tbl); 199} 200 201static int 202gpt_write_hdr(int fd, struct gpt_hdr *hdr, uint64_t self, uint64_t alt, 203 uint64_t tbl, u_int secsz) 204{ 205 uint32_t crc; 206 207 le64enc(&hdr->hdr_lba_self, self); 208 le64enc(&hdr->hdr_lba_alt, alt); 209 le64enc(&hdr->hdr_lba_table, tbl); 210 hdr->hdr_crc_self = 0; 211 crc = crc32(hdr, offsetof(struct gpt_hdr, padding)); 212 le64enc(&hdr->hdr_crc_self, crc); 213 return (gpt_filewrite(fd, self * secsz, hdr, secsz)); 214} 215 216static int 217gpt_write(int fd, off_t imgsz, u_int parts, u_int secsz) 218{ 219 uuid_t uuid; 220 struct gpt_ent *tbl; 221 struct gpt_hdr *hdr; 222 off_t nblocks; 223 uint32_t crc; 224 u_int tblsz; 225 int error; 226 227 nblocks = imgsz / secsz; 228 229 /* PMBR */ 230 error = gpt_write_pmbr(fd, nblocks, secsz); 231 if (error) 232 return (error); 233 234 /* GPT table(s) */ 235 tblsz = gpt_tblsz(parts, secsz); 236 tbl = gpt_mktbl(tblsz, secsz); 237 if (tbl == NULL) 238 return (errno); 239 error = gpt_filewrite(fd, 2 * secsz, tbl, tblsz * secsz); 240 if (error) 241 goto out; 242 error = gpt_filewrite(fd, imgsz - (tblsz + 1) * secsz, tbl, 243 tblsz * secsz); 244 if (error) 245 goto out; 246 247 /* GPT header(s) */ 248 hdr = malloc(secsz); 249 if (hdr == NULL) { 250 error = errno; 251 goto out; 252 } 253 memset(hdr, 0, secsz); 254 memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)); 255 le32enc(&hdr->hdr_revision, GPT_HDR_REVISION); 256 le32enc(&hdr->hdr_size, offsetof(struct gpt_hdr, padding)); 257 le64enc(&hdr->hdr_lba_start, 2 + tblsz); 258 le64enc(&hdr->hdr_lba_end, nblocks - tblsz - 2); 259 uuidgen(&uuid, 1); 260 uuid_enc_le(&hdr->hdr_uuid, &uuid); 261 le32enc(&hdr->hdr_entries, parts); 262 le32enc(&hdr->hdr_entsz, sizeof(struct gpt_ent)); 263 crc = crc32(tbl, parts * sizeof(struct gpt_ent)); 264 le32enc(&hdr->hdr_crc_table, crc); 265 error = gpt_write_hdr(fd, hdr, 1, nblocks - 1, 2, secsz); 266 if (!error) 267 error = gpt_write_hdr(fd, hdr, nblocks - 1, 1, 268 nblocks - tblsz - 1, secsz); 269 free(hdr); 270 271 out: 272 free(tbl); 273 return (error); 274} 275 276static struct mkimg_scheme gpt_scheme = { 277 .name = "gpt", 278 .description = "GUID Partition Table", 279 .aliases = gpt_aliases, 280 .metadata = gpt_metadata, 281 .write = gpt_write, 282 .nparts = 4096, 283 .labellen = 36 284}; 285 286SCHEME_DEFINE(gpt_scheme); 287