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