1113593Sphk/*- 2113593Sphk * Copyright (c) 2002 Poul-Henning Kamp 3113593Sphk * Copyright (c) 2002 Networks Associates Technology, Inc. 4113593Sphk * All rights reserved. 5113593Sphk * 6113593Sphk * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7113593Sphk * and NAI Labs, the Security Research Division of Network Associates, Inc. 8113593Sphk * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9113593Sphk * DARPA CHATS research program. 10113593Sphk * 11113593Sphk * Redistribution and use in source and binary forms, with or without 12113593Sphk * modification, are permitted provided that the following conditions 13113593Sphk * are met: 14113593Sphk * 1. Redistributions of source code must retain the above copyright 15113593Sphk * notice, this list of conditions and the following disclaimer. 16113593Sphk * 2. Redistributions in binary form must reproduce the above copyright 17113593Sphk * notice, this list of conditions and the following disclaimer in the 18113593Sphk * documentation and/or other materials provided with the distribution. 19113593Sphk * 3. The names of the authors may not be used to endorse or promote 20113593Sphk * products derived from this software without specific prior written 21113593Sphk * permission. 22113593Sphk * 23113593Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24113593Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25113593Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26113593Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27113593Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28113593Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29113593Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30113593Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31113593Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32113593Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33113593Sphk * SUCH DAMAGE. 34139778Simp */ 35139778Simp 36139778Simp/* 37113593Sphk * Functions to encode and decode struct disklabel and struct partition into 38298808Spfg * a bytestream of little endianness and correct packing. 39113593Sphk * 40113593Sphk * NB! This file must be usable both in kernel and userland. 41113593Sphk */ 42113593Sphk 43116196Sobrien#include <sys/cdefs.h> 44116196Sobrien__FBSDID("$FreeBSD: releng/11.0/sys/geom/geom_bsd_enc.c 298808 2016-04-29 20:56:58Z pfg $"); 45116196Sobrien 46113593Sphk#include <sys/types.h> 47113593Sphk#include <sys/endian.h> 48113593Sphk#include <sys/disklabel.h> 49114556Sphk#include <sys/errno.h> 50113593Sphk#ifdef _KERNEL 51113593Sphk#include <sys/systm.h> 52114548Sphk#else 53114548Sphk#include <string.h> 54113593Sphk#endif 55113593Sphk 56113593Sphkvoid 57113593Sphkbsd_partition_le_dec(u_char *ptr, struct partition *d) 58113593Sphk{ 59113593Sphk d->p_size = le32dec(ptr + 0); 60113593Sphk d->p_offset = le32dec(ptr + 4); 61113593Sphk d->p_fsize = le32dec(ptr + 8); 62113593Sphk d->p_fstype = ptr[12]; 63113593Sphk d->p_frag = ptr[13]; 64113593Sphk d->p_cpg = le16dec(ptr + 14); 65113593Sphk} 66113593Sphk 67114556Sphkint 68114556Sphkbsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart) 69113593Sphk{ 70113593Sphk int i; 71114556Sphk u_char *p, *pe; 72114556Sphk uint16_t sum; 73113593Sphk 74113593Sphk d->d_magic = le32dec(ptr + 0); 75114556Sphk if (d->d_magic != DISKMAGIC) 76114556Sphk return(EINVAL); 77114556Sphk 78114556Sphk d->d_magic2 = le32dec(ptr + 132); 79114556Sphk if (d->d_magic2 != DISKMAGIC) { 80114556Sphk return(EINVAL); 81114556Sphk } 82114556Sphk 83114556Sphk d->d_npartitions = le16dec(ptr + 138); 84114556Sphk if (d->d_npartitions > maxpart) { 85114556Sphk return(EINVAL); 86114556Sphk } 87114556Sphk 88114556Sphk pe = ptr + 148 + 16 * d->d_npartitions; 89114556Sphk sum = 0; 90114556Sphk for (p = ptr; p < pe; p += 2) 91114556Sphk sum ^= le16dec(p); 92114556Sphk if (sum != 0) { 93114556Sphk return(EINVAL); 94114556Sphk } 95114556Sphk 96113593Sphk d->d_type = le16dec(ptr + 4); 97113593Sphk d->d_subtype = le16dec(ptr + 6); 98113593Sphk bcopy(ptr + 8, d->d_typename, 16); 99113593Sphk bcopy(ptr + 24, d->d_packname, 16); 100113593Sphk d->d_secsize = le32dec(ptr + 40); 101113593Sphk d->d_nsectors = le32dec(ptr + 44); 102113593Sphk d->d_ntracks = le32dec(ptr + 48); 103113593Sphk d->d_ncylinders = le32dec(ptr + 52); 104113593Sphk d->d_secpercyl = le32dec(ptr + 56); 105113593Sphk d->d_secperunit = le32dec(ptr + 60); 106113593Sphk d->d_sparespertrack = le16dec(ptr + 64); 107113593Sphk d->d_sparespercyl = le16dec(ptr + 66); 108113593Sphk d->d_acylinders = le32dec(ptr + 68); 109113593Sphk d->d_rpm = le16dec(ptr + 72); 110113593Sphk d->d_interleave = le16dec(ptr + 74); 111113593Sphk d->d_trackskew = le16dec(ptr + 76); 112113593Sphk d->d_cylskew = le16dec(ptr + 78); 113113593Sphk d->d_headswitch = le32dec(ptr + 80); 114113593Sphk d->d_trkseek = le32dec(ptr + 84); 115113593Sphk d->d_flags = le32dec(ptr + 88); 116113593Sphk d->d_drivedata[0] = le32dec(ptr + 92); 117113593Sphk d->d_drivedata[1] = le32dec(ptr + 96); 118113593Sphk d->d_drivedata[2] = le32dec(ptr + 100); 119113593Sphk d->d_drivedata[3] = le32dec(ptr + 104); 120113593Sphk d->d_drivedata[4] = le32dec(ptr + 108); 121113593Sphk d->d_spare[0] = le32dec(ptr + 112); 122113593Sphk d->d_spare[1] = le32dec(ptr + 116); 123113593Sphk d->d_spare[2] = le32dec(ptr + 120); 124113593Sphk d->d_spare[3] = le32dec(ptr + 124); 125113593Sphk d->d_spare[4] = le32dec(ptr + 128); 126113593Sphk d->d_checksum = le16dec(ptr + 136); 127113593Sphk d->d_npartitions = le16dec(ptr + 138); 128113593Sphk d->d_bbsize = le32dec(ptr + 140); 129113593Sphk d->d_sbsize = le32dec(ptr + 144); 130174500Smarcel for (i = 0; i < d->d_npartitions; i++) 131113593Sphk bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]); 132114556Sphk return(0); 133113593Sphk} 134113593Sphk 135113593Sphkvoid 136113593Sphkbsd_partition_le_enc(u_char *ptr, struct partition *d) 137113593Sphk{ 138113593Sphk le32enc(ptr + 0, d->p_size); 139113593Sphk le32enc(ptr + 4, d->p_offset); 140113593Sphk le32enc(ptr + 8, d->p_fsize); 141113593Sphk ptr[12] = d->p_fstype; 142113593Sphk ptr[13] = d->p_frag; 143113593Sphk le16enc(ptr + 14, d->p_cpg); 144113593Sphk} 145113593Sphk 146113593Sphkvoid 147113593Sphkbsd_disklabel_le_enc(u_char *ptr, struct disklabel *d) 148113593Sphk{ 149113593Sphk int i; 150114556Sphk u_char *p, *pe; 151114556Sphk uint16_t sum; 152113593Sphk 153113593Sphk le32enc(ptr + 0, d->d_magic); 154113593Sphk le16enc(ptr + 4, d->d_type); 155113593Sphk le16enc(ptr + 6, d->d_subtype); 156113593Sphk bcopy(d->d_typename, ptr + 8, 16); 157113593Sphk bcopy(d->d_packname, ptr + 24, 16); 158113593Sphk le32enc(ptr + 40, d->d_secsize); 159113593Sphk le32enc(ptr + 44, d->d_nsectors); 160113593Sphk le32enc(ptr + 48, d->d_ntracks); 161113593Sphk le32enc(ptr + 52, d->d_ncylinders); 162113593Sphk le32enc(ptr + 56, d->d_secpercyl); 163113593Sphk le32enc(ptr + 60, d->d_secperunit); 164113593Sphk le16enc(ptr + 64, d->d_sparespertrack); 165113593Sphk le16enc(ptr + 66, d->d_sparespercyl); 166113593Sphk le32enc(ptr + 68, d->d_acylinders); 167113593Sphk le16enc(ptr + 72, d->d_rpm); 168113593Sphk le16enc(ptr + 74, d->d_interleave); 169113593Sphk le16enc(ptr + 76, d->d_trackskew); 170113593Sphk le16enc(ptr + 78, d->d_cylskew); 171113593Sphk le32enc(ptr + 80, d->d_headswitch); 172113593Sphk le32enc(ptr + 84, d->d_trkseek); 173113593Sphk le32enc(ptr + 88, d->d_flags); 174113593Sphk le32enc(ptr + 92, d->d_drivedata[0]); 175113593Sphk le32enc(ptr + 96, d->d_drivedata[1]); 176113593Sphk le32enc(ptr + 100, d->d_drivedata[2]); 177113593Sphk le32enc(ptr + 104, d->d_drivedata[3]); 178113593Sphk le32enc(ptr + 108, d->d_drivedata[4]); 179113593Sphk le32enc(ptr + 112, d->d_spare[0]); 180113593Sphk le32enc(ptr + 116, d->d_spare[1]); 181113593Sphk le32enc(ptr + 120, d->d_spare[2]); 182113593Sphk le32enc(ptr + 124, d->d_spare[3]); 183113593Sphk le32enc(ptr + 128, d->d_spare[4]); 184113593Sphk le32enc(ptr + 132, d->d_magic2); 185114556Sphk le16enc(ptr + 136, 0); 186113593Sphk le16enc(ptr + 138, d->d_npartitions); 187113593Sphk le32enc(ptr + 140, d->d_bbsize); 188113593Sphk le32enc(ptr + 144, d->d_sbsize); 189114556Sphk for (i = 0; i < d->d_npartitions; i++) 190113593Sphk bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]); 191114556Sphk pe = ptr + 148 + 16 * d->d_npartitions; 192114556Sphk sum = 0; 193114556Sphk for (p = ptr; p < pe; p += 2) 194114556Sphk sum ^= le16dec(p); 195114556Sphk le16enc(ptr + 136, sum); 196113593Sphk} 197