geom_bsd_enc.c revision 114556
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. 34113593Sphk * 35113593Sphk * $FreeBSD: head/sys/geom/geom_bsd_enc.c 114556 2003-05-02 22:46:13Z phk $ 36113593Sphk * 37113593Sphk * Functions to encode and decode struct disklabel and struct partition into 38113593Sphk * a bytestream of little endianess and correct packing. 39113593Sphk * 40113593Sphk * NB! This file must be usable both in kernel and userland. 41113593Sphk * 42113593Sphk */ 43113593Sphk 44113593Sphk#include <sys/types.h> 45113593Sphk#include <sys/endian.h> 46113593Sphk#include <sys/disklabel.h> 47114556Sphk#include <sys/errno.h> 48113593Sphk#ifdef _KERNEL 49113593Sphk#include <sys/systm.h> 50114548Sphk#else 51114548Sphk#include <string.h> 52114556Sphk#include <stdio.h> 53113593Sphk#endif 54113593Sphk 55113593Sphkvoid 56113593Sphkbsd_partition_le_dec(u_char *ptr, struct partition *d) 57113593Sphk{ 58113593Sphk d->p_size = le32dec(ptr + 0); 59113593Sphk d->p_offset = le32dec(ptr + 4); 60113593Sphk d->p_fsize = le32dec(ptr + 8); 61113593Sphk d->p_fstype = ptr[12]; 62113593Sphk d->p_frag = ptr[13]; 63113593Sphk d->p_cpg = le16dec(ptr + 14); 64113593Sphk} 65113593Sphk 66114556Sphkint 67114556Sphkbsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart) 68113593Sphk{ 69113593Sphk int i; 70114556Sphk u_char *p, *pe; 71114556Sphk uint16_t sum; 72113593Sphk 73113593Sphk d->d_magic = le32dec(ptr + 0); 74114556Sphk if (d->d_magic != DISKMAGIC) 75114556Sphk return(EINVAL); 76114556Sphk 77114556Sphk d->d_magic2 = le32dec(ptr + 132); 78114556Sphk if (d->d_magic2 != DISKMAGIC) { 79114556Sphkprintf("HERE %s %d\n", __FILE__, __LINE__); 80114556Sphk return(EINVAL); 81114556Sphk } 82114556Sphk 83114556Sphk d->d_npartitions = le16dec(ptr + 138); 84114556Sphk if (d->d_npartitions > maxpart) { 85114556Sphkprintf("HERE %s %d\n", __FILE__, __LINE__); 86114556Sphk return(EINVAL); 87114556Sphk } 88114556Sphk 89114556Sphk pe = ptr + 148 + 16 * d->d_npartitions; 90114556Sphk sum = 0; 91114556Sphk for (p = ptr; p < pe; p += 2) 92114556Sphk sum ^= le16dec(p); 93114556Sphk if (sum != 0) { 94114556Sphkprintf("HERE %s %d\n", __FILE__, __LINE__); 95114556Sphk return(EINVAL); 96114556Sphk } 97114556Sphk 98113593Sphk d->d_type = le16dec(ptr + 4); 99113593Sphk d->d_subtype = le16dec(ptr + 6); 100113593Sphk bcopy(ptr + 8, d->d_typename, 16); 101113593Sphk bcopy(ptr + 24, d->d_packname, 16); 102113593Sphk d->d_secsize = le32dec(ptr + 40); 103113593Sphk d->d_nsectors = le32dec(ptr + 44); 104113593Sphk d->d_ntracks = le32dec(ptr + 48); 105113593Sphk d->d_ncylinders = le32dec(ptr + 52); 106113593Sphk d->d_secpercyl = le32dec(ptr + 56); 107113593Sphk d->d_secperunit = le32dec(ptr + 60); 108113593Sphk d->d_sparespertrack = le16dec(ptr + 64); 109113593Sphk d->d_sparespercyl = le16dec(ptr + 66); 110113593Sphk d->d_acylinders = le32dec(ptr + 68); 111113593Sphk d->d_rpm = le16dec(ptr + 72); 112113593Sphk d->d_interleave = le16dec(ptr + 74); 113113593Sphk d->d_trackskew = le16dec(ptr + 76); 114113593Sphk d->d_cylskew = le16dec(ptr + 78); 115113593Sphk d->d_headswitch = le32dec(ptr + 80); 116113593Sphk d->d_trkseek = le32dec(ptr + 84); 117113593Sphk d->d_flags = le32dec(ptr + 88); 118113593Sphk d->d_drivedata[0] = le32dec(ptr + 92); 119113593Sphk d->d_drivedata[1] = le32dec(ptr + 96); 120113593Sphk d->d_drivedata[2] = le32dec(ptr + 100); 121113593Sphk d->d_drivedata[3] = le32dec(ptr + 104); 122113593Sphk d->d_drivedata[4] = le32dec(ptr + 108); 123113593Sphk d->d_spare[0] = le32dec(ptr + 112); 124113593Sphk d->d_spare[1] = le32dec(ptr + 116); 125113593Sphk d->d_spare[2] = le32dec(ptr + 120); 126113593Sphk d->d_spare[3] = le32dec(ptr + 124); 127113593Sphk d->d_spare[4] = le32dec(ptr + 128); 128113593Sphk d->d_checksum = le16dec(ptr + 136); 129113593Sphk d->d_npartitions = le16dec(ptr + 138); 130113593Sphk d->d_bbsize = le32dec(ptr + 140); 131113593Sphk d->d_sbsize = le32dec(ptr + 144); 132113593Sphk for (i = 0; i < MAXPARTITIONS; i++) 133113593Sphk bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]); 134114556Sphk return(0); 135113593Sphk} 136113593Sphk 137113593Sphkvoid 138113593Sphkbsd_partition_le_enc(u_char *ptr, struct partition *d) 139113593Sphk{ 140113593Sphk le32enc(ptr + 0, d->p_size); 141113593Sphk le32enc(ptr + 4, d->p_offset); 142113593Sphk le32enc(ptr + 8, d->p_fsize); 143113593Sphk ptr[12] = d->p_fstype; 144113593Sphk ptr[13] = d->p_frag; 145113593Sphk le16enc(ptr + 14, d->p_cpg); 146113593Sphk} 147113593Sphk 148113593Sphkvoid 149113593Sphkbsd_disklabel_le_enc(u_char *ptr, struct disklabel *d) 150113593Sphk{ 151113593Sphk int i; 152114556Sphk u_char *p, *pe; 153114556Sphk uint16_t sum; 154113593Sphk 155113593Sphk le32enc(ptr + 0, d->d_magic); 156113593Sphk le16enc(ptr + 4, d->d_type); 157113593Sphk le16enc(ptr + 6, d->d_subtype); 158113593Sphk bcopy(d->d_typename, ptr + 8, 16); 159113593Sphk bcopy(d->d_packname, ptr + 24, 16); 160113593Sphk le32enc(ptr + 40, d->d_secsize); 161113593Sphk le32enc(ptr + 44, d->d_nsectors); 162113593Sphk le32enc(ptr + 48, d->d_ntracks); 163113593Sphk le32enc(ptr + 52, d->d_ncylinders); 164113593Sphk le32enc(ptr + 56, d->d_secpercyl); 165113593Sphk le32enc(ptr + 60, d->d_secperunit); 166113593Sphk le16enc(ptr + 64, d->d_sparespertrack); 167113593Sphk le16enc(ptr + 66, d->d_sparespercyl); 168113593Sphk le32enc(ptr + 68, d->d_acylinders); 169113593Sphk le16enc(ptr + 72, d->d_rpm); 170113593Sphk le16enc(ptr + 74, d->d_interleave); 171113593Sphk le16enc(ptr + 76, d->d_trackskew); 172113593Sphk le16enc(ptr + 78, d->d_cylskew); 173113593Sphk le32enc(ptr + 80, d->d_headswitch); 174113593Sphk le32enc(ptr + 84, d->d_trkseek); 175113593Sphk le32enc(ptr + 88, d->d_flags); 176113593Sphk le32enc(ptr + 92, d->d_drivedata[0]); 177113593Sphk le32enc(ptr + 96, d->d_drivedata[1]); 178113593Sphk le32enc(ptr + 100, d->d_drivedata[2]); 179113593Sphk le32enc(ptr + 104, d->d_drivedata[3]); 180113593Sphk le32enc(ptr + 108, d->d_drivedata[4]); 181113593Sphk le32enc(ptr + 112, d->d_spare[0]); 182113593Sphk le32enc(ptr + 116, d->d_spare[1]); 183113593Sphk le32enc(ptr + 120, d->d_spare[2]); 184113593Sphk le32enc(ptr + 124, d->d_spare[3]); 185113593Sphk le32enc(ptr + 128, d->d_spare[4]); 186113593Sphk le32enc(ptr + 132, d->d_magic2); 187114556Sphk le16enc(ptr + 136, 0); 188113593Sphk le16enc(ptr + 138, d->d_npartitions); 189113593Sphk le32enc(ptr + 140, d->d_bbsize); 190113593Sphk le32enc(ptr + 144, d->d_sbsize); 191114556Sphk for (i = 0; i < d->d_npartitions; i++) 192113593Sphk bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]); 193114556Sphk pe = ptr + 148 + 16 * d->d_npartitions; 194114556Sphk sum = 0; 195114556Sphk for (p = ptr; p < pe; p += 2) 196114556Sphk sum ^= le16dec(p); 197114556Sphk le16enc(ptr + 136, sum); 198113593Sphk} 199