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 * Functions to encode and decode struct disklabel and struct partition into 36 * a bytestream of little endianess and correct packing. 37 * 38 * NB! This file must be usable both in kernel and userland. 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/types.h> 45 #include <sys/endian.h> 46 #include <sys/disklabel.h> 47 #include <sys/errno.h> 48 #ifdef _KERNEL 49 #include <sys/systm.h> 50 #else 51 #include <string.h> 52 #endif 53 54 void 55 bsd_partition_le_dec(u_char *ptr, struct partition *d) 56 { 57 d->p_size = le32dec(ptr + 0); 58 d->p_offset = le32dec(ptr + 4); 59 d->p_fsize = le32dec(ptr + 8); 60 d->p_fstype = ptr[12]; 61 d->p_frag = ptr[13]; 62 d->p_cpg = le16dec(ptr + 14); 63 } 64 65 int 66 bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart) 67 { 68 int i; 69 u_char *p, *pe; 70 uint16_t sum; 71 72 d->d_magic = le32dec(ptr + 0); 73 if (d->d_magic != DISKMAGIC) 74 return(EINVAL); 75 76 d->d_magic2 = le32dec(ptr + 132); 77 if (d->d_magic2 != DISKMAGIC) { 78 return(EINVAL); 79 } 80 81 d->d_npartitions = le16dec(ptr + 138); 82 if (d->d_npartitions > maxpart) { 83 return(EINVAL); 84 } 85 86 pe = ptr + 148 + 16 * d->d_npartitions; 87 sum = 0; 88 for (p = ptr; p < pe; p += 2) 89 sum ^= le16dec(p); 90 if (sum != 0) { 91 return(EINVAL); 92 } 93 94 d->d_type = le16dec(ptr + 4); 95 d->d_subtype = le16dec(ptr + 6); 96 bcopy(ptr + 8, d->d_typename, 16); 97 bcopy(ptr + 24, d->d_packname, 16); 98 d->d_secsize = le32dec(ptr + 40); 99 d->d_nsectors = le32dec(ptr + 44); 100 d->d_ntracks = le32dec(ptr + 48); 101 d->d_ncylinders = le32dec(ptr + 52); 102 d->d_secpercyl = le32dec(ptr + 56); 103 d->d_secperunit = le32dec(ptr + 60); 104 d->d_sparespertrack = le16dec(ptr + 64); 105 d->d_sparespercyl = le16dec(ptr + 66); 106 d->d_acylinders = le32dec(ptr + 68); 107 d->d_rpm = le16dec(ptr + 72); 108 d->d_interleave = le16dec(ptr + 74); 109 d->d_trackskew = le16dec(ptr + 76); 110 d->d_cylskew = le16dec(ptr + 78); 111 d->d_headswitch = le32dec(ptr + 80); 112 d->d_trkseek = le32dec(ptr + 84); 113 d->d_flags = le32dec(ptr + 88); 114 d->d_drivedata[0] = le32dec(ptr + 92); 115 d->d_drivedata[1] = le32dec(ptr + 96); 116 d->d_drivedata[2] = le32dec(ptr + 100); 117 d->d_drivedata[3] = le32dec(ptr + 104); 118 d->d_drivedata[4] = le32dec(ptr + 108); 119 d->d_spare[0] = le32dec(ptr + 112); 120 d->d_spare[1] = le32dec(ptr + 116); 121 d->d_spare[2] = le32dec(ptr + 120); 122 d->d_spare[3] = le32dec(ptr + 124); 123 d->d_spare[4] = le32dec(ptr + 128); 124 d->d_checksum = le16dec(ptr + 136); 125 d->d_npartitions = le16dec(ptr + 138); 126 d->d_bbsize = le32dec(ptr + 140); 127 d->d_sbsize = le32dec(ptr + 144); 128 for (i = 0; i < MAXPARTITIONS; i++) 129 bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]); 130 return(0); 131 } 132 133 void 134 bsd_partition_le_enc(u_char *ptr, struct partition *d) 135 { 136 le32enc(ptr + 0, d->p_size); 137 le32enc(ptr + 4, d->p_offset); 138 le32enc(ptr + 8, d->p_fsize); 139 ptr[12] = d->p_fstype; 140 ptr[13] = d->p_frag; 141 le16enc(ptr + 14, d->p_cpg); 142 } 143 144 void 145 bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d) 146 { 147 int i; 148 u_char *p, *pe; 149 uint16_t sum; 150 151 le32enc(ptr + 0, d->d_magic); 152 le16enc(ptr + 4, d->d_type); 153 le16enc(ptr + 6, d->d_subtype); 154 bcopy(d->d_typename, ptr + 8, 16); 155 bcopy(d->d_packname, ptr + 24, 16); 156 le32enc(ptr + 40, d->d_secsize); 157 le32enc(ptr + 44, d->d_nsectors); 158 le32enc(ptr + 48, d->d_ntracks); 159 le32enc(ptr + 52, d->d_ncylinders); 160 le32enc(ptr + 56, d->d_secpercyl); 161 le32enc(ptr + 60, d->d_secperunit); 162 le16enc(ptr + 64, d->d_sparespertrack); 163 le16enc(ptr + 66, d->d_sparespercyl); 164 le32enc(ptr + 68, d->d_acylinders); 165 le16enc(ptr + 72, d->d_rpm); 166 le16enc(ptr + 74, d->d_interleave); 167 le16enc(ptr + 76, d->d_trackskew); 168 le16enc(ptr + 78, d->d_cylskew); 169 le32enc(ptr + 80, d->d_headswitch); 170 le32enc(ptr + 84, d->d_trkseek); 171 le32enc(ptr + 88, d->d_flags); 172 le32enc(ptr + 92, d->d_drivedata[0]); 173 le32enc(ptr + 96, d->d_drivedata[1]); 174 le32enc(ptr + 100, d->d_drivedata[2]); 175 le32enc(ptr + 104, d->d_drivedata[3]); 176 le32enc(ptr + 108, d->d_drivedata[4]); 177 le32enc(ptr + 112, d->d_spare[0]); 178 le32enc(ptr + 116, d->d_spare[1]); 179 le32enc(ptr + 120, d->d_spare[2]); 180 le32enc(ptr + 124, d->d_spare[3]); 181 le32enc(ptr + 128, d->d_spare[4]); 182 le32enc(ptr + 132, d->d_magic2); 183 le16enc(ptr + 136, 0); 184 le16enc(ptr + 138, d->d_npartitions); 185 le32enc(ptr + 140, d->d_bbsize); 186 le32enc(ptr + 144, d->d_sbsize); 187 for (i = 0; i < d->d_npartitions; i++) 188 bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]); 189 pe = ptr + 148 + 16 * d->d_npartitions; 190 sum = 0; 191 for (p = ptr; p < pe; p += 2) 192 sum ^= le16dec(p); 193 le16enc(ptr + 136, sum); 194 } 195