1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Poul-Henning Kamp 5 * Copyright (c) 2002 Networks Associates Technology, Inc. 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 9 * and NAI Labs, the Security Research Division of Network Associates, Inc. 10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 11 * DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 /* 39 * Functions to encode and decode struct disklabel and struct partition into 40 * a bytestream of little endianness and correct packing. 41 * 42 * NB! This file must be usable both in kernel and userland. 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/types.h> 49 #include <sys/endian.h> 50 #include <sys/disklabel.h> 51 #include <sys/errno.h> 52 #ifdef _KERNEL 53 #include <sys/systm.h> 54 #else 55 #include <string.h> 56 #endif 57 58 void 59 bsd_partition_le_dec(u_char *ptr, struct partition *d) 60 { 61 d->p_size = le32dec(ptr + 0); 62 d->p_offset = le32dec(ptr + 4); 63 d->p_fsize = le32dec(ptr + 8); 64 d->p_fstype = ptr[12]; 65 d->p_frag = ptr[13]; 66 d->p_cpg = le16dec(ptr + 14); 67 } 68 69 int 70 bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart) 71 { 72 int i; 73 u_char *p, *pe; 74 uint16_t sum; 75 76 d->d_magic = le32dec(ptr + 0); 77 if (d->d_magic != DISKMAGIC) 78 return(EINVAL); 79 80 d->d_magic2 = le32dec(ptr + 132); 81 if (d->d_magic2 != DISKMAGIC) { 82 return(EINVAL); 83 } 84 85 d->d_npartitions = le16dec(ptr + 138); 86 if (d->d_npartitions > maxpart) { 87 return(EINVAL); 88 } 89 90 pe = ptr + 148 + 16 * d->d_npartitions; 91 sum = 0; 92 for (p = ptr; p < pe; p += 2) 93 sum ^= le16dec(p); 94 if (sum != 0) { 95 return(EINVAL); 96 } 97 98 d->d_type = le16dec(ptr + 4); 99 d->d_subtype = le16dec(ptr + 6); 100 bcopy(ptr + 8, d->d_typename, 16); 101 bcopy(ptr + 24, d->d_packname, 16); 102 d->d_secsize = le32dec(ptr + 40); 103 d->d_nsectors = le32dec(ptr + 44); 104 d->d_ntracks = le32dec(ptr + 48); 105 d->d_ncylinders = le32dec(ptr + 52); 106 d->d_secpercyl = le32dec(ptr + 56); 107 d->d_secperunit = le32dec(ptr + 60); 108 d->d_sparespertrack = le16dec(ptr + 64); 109 d->d_sparespercyl = le16dec(ptr + 66); 110 d->d_acylinders = le32dec(ptr + 68); 111 d->d_rpm = le16dec(ptr + 72); 112 d->d_interleave = le16dec(ptr + 74); 113 d->d_trackskew = le16dec(ptr + 76); 114 d->d_cylskew = le16dec(ptr + 78); 115 d->d_headswitch = le32dec(ptr + 80); 116 d->d_trkseek = le32dec(ptr + 84); 117 d->d_flags = le32dec(ptr + 88); 118 d->d_drivedata[0] = le32dec(ptr + 92); 119 d->d_drivedata[1] = le32dec(ptr + 96); 120 d->d_drivedata[2] = le32dec(ptr + 100); 121 d->d_drivedata[3] = le32dec(ptr + 104); 122 d->d_drivedata[4] = le32dec(ptr + 108); 123 d->d_spare[0] = le32dec(ptr + 112); 124 d->d_spare[1] = le32dec(ptr + 116); 125 d->d_spare[2] = le32dec(ptr + 120); 126 d->d_spare[3] = le32dec(ptr + 124); 127 d->d_spare[4] = le32dec(ptr + 128); 128 d->d_checksum = le16dec(ptr + 136); 129 d->d_npartitions = le16dec(ptr + 138); 130 d->d_bbsize = le32dec(ptr + 140); 131 d->d_sbsize = le32dec(ptr + 144); 132 for (i = 0; i < d->d_npartitions; i++) 133 bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]); 134 return(0); 135 } 136 137 void 138 bsd_partition_le_enc(u_char *ptr, struct partition *d) 139 { 140 le32enc(ptr + 0, d->p_size); 141 le32enc(ptr + 4, d->p_offset); 142 le32enc(ptr + 8, d->p_fsize); 143 ptr[12] = d->p_fstype; 144 ptr[13] = d->p_frag; 145 le16enc(ptr + 14, d->p_cpg); 146 } 147 148 void 149 bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d) 150 { 151 int i; 152 u_char *p, *pe; 153 uint16_t sum; 154 155 le32enc(ptr + 0, d->d_magic); 156 le16enc(ptr + 4, d->d_type); 157 le16enc(ptr + 6, d->d_subtype); 158 bcopy(d->d_typename, ptr + 8, 16); 159 bcopy(d->d_packname, ptr + 24, 16); 160 le32enc(ptr + 40, d->d_secsize); 161 le32enc(ptr + 44, d->d_nsectors); 162 le32enc(ptr + 48, d->d_ntracks); 163 le32enc(ptr + 52, d->d_ncylinders); 164 le32enc(ptr + 56, d->d_secpercyl); 165 le32enc(ptr + 60, d->d_secperunit); 166 le16enc(ptr + 64, d->d_sparespertrack); 167 le16enc(ptr + 66, d->d_sparespercyl); 168 le32enc(ptr + 68, d->d_acylinders); 169 le16enc(ptr + 72, d->d_rpm); 170 le16enc(ptr + 74, d->d_interleave); 171 le16enc(ptr + 76, d->d_trackskew); 172 le16enc(ptr + 78, d->d_cylskew); 173 le32enc(ptr + 80, d->d_headswitch); 174 le32enc(ptr + 84, d->d_trkseek); 175 le32enc(ptr + 88, d->d_flags); 176 le32enc(ptr + 92, d->d_drivedata[0]); 177 le32enc(ptr + 96, d->d_drivedata[1]); 178 le32enc(ptr + 100, d->d_drivedata[2]); 179 le32enc(ptr + 104, d->d_drivedata[3]); 180 le32enc(ptr + 108, d->d_drivedata[4]); 181 le32enc(ptr + 112, d->d_spare[0]); 182 le32enc(ptr + 116, d->d_spare[1]); 183 le32enc(ptr + 120, d->d_spare[2]); 184 le32enc(ptr + 124, d->d_spare[3]); 185 le32enc(ptr + 128, d->d_spare[4]); 186 le32enc(ptr + 132, d->d_magic2); 187 le16enc(ptr + 136, 0); 188 le16enc(ptr + 138, d->d_npartitions); 189 le32enc(ptr + 140, d->d_bbsize); 190 le32enc(ptr + 144, d->d_sbsize); 191 for (i = 0; i < d->d_npartitions; i++) 192 bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]); 193 pe = ptr + 148 + 16 * d->d_npartitions; 194 sum = 0; 195 for (p = ptr; p < pe; p += 2) 196 sum ^= le16dec(p); 197 le16enc(ptr + 136, sum); 198 } 199