geom_bsd_enc.c revision 302408
1219019Sgabor/*- 2263986Stijl * Copyright (c) 2002 Poul-Henning Kamp 3219019Sgabor * Copyright (c) 2002 Networks Associates Technology, Inc. 4219019Sgabor * All rights reserved. 5219019Sgabor * 6219019Sgabor * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7219019Sgabor * and NAI Labs, the Security Research Division of Network Associates, Inc. 8219019Sgabor * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9219019Sgabor * DARPA CHATS research program. 10219019Sgabor * 11219019Sgabor * Redistribution and use in source and binary forms, with or without 12219019Sgabor * modification, are permitted provided that the following conditions 13219019Sgabor * are met: 14219019Sgabor * 1. Redistributions of source code must retain the above copyright 15219019Sgabor * notice, this list of conditions and the following disclaimer. 16219019Sgabor * 2. Redistributions in binary form must reproduce the above copyright 17219019Sgabor * notice, this list of conditions and the following disclaimer in the 18219019Sgabor * documentation and/or other materials provided with the distribution. 19219019Sgabor * 3. The names of the authors may not be used to endorse or promote 20219019Sgabor * products derived from this software without specific prior written 21219019Sgabor * permission. 22219019Sgabor * 23219019Sgabor * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24219019Sgabor * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25219019Sgabor * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26219019Sgabor * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27219019Sgabor * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28219019Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29219019Sgabor * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30219019Sgabor * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31219019Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32219019Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33219019Sgabor * SUCH DAMAGE. 34219019Sgabor */ 35219019Sgabor 36219019Sgabor/* 37219019Sgabor * Functions to encode and decode struct disklabel and struct partition into 38219019Sgabor * a bytestream of little endianness and correct packing. 39219019Sgabor * 40219019Sgabor * NB! This file must be usable both in kernel and userland. 41219019Sgabor */ 42219019Sgabor 43219019Sgabor#include <sys/cdefs.h> 44219019Sgabor__FBSDID("$FreeBSD: stable/11/sys/geom/geom_bsd_enc.c 298808 2016-04-29 20:56:58Z pfg $"); 45219019Sgabor 46219019Sgabor#include <sys/types.h> 47219019Sgabor#include <sys/endian.h> 48219019Sgabor#include <sys/disklabel.h> 49219019Sgabor#include <sys/errno.h> 50219019Sgabor#ifdef _KERNEL 51219019Sgabor#include <sys/systm.h> 52219019Sgabor#else 53219019Sgabor#include <string.h> 54219019Sgabor#endif 55219019Sgabor 56219019Sgaborvoid 57219019Sgaborbsd_partition_le_dec(u_char *ptr, struct partition *d) 58219019Sgabor{ 59219019Sgabor d->p_size = le32dec(ptr + 0); 60219019Sgabor d->p_offset = le32dec(ptr + 4); 61219019Sgabor d->p_fsize = le32dec(ptr + 8); 62219019Sgabor d->p_fstype = ptr[12]; 63219019Sgabor d->p_frag = ptr[13]; 64219019Sgabor d->p_cpg = le16dec(ptr + 14); 65219019Sgabor} 66219019Sgabor 67219019Sgaborint 68219019Sgaborbsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart) 69219019Sgabor{ 70219019Sgabor int i; 71252584Speter u_char *p, *pe; 72252584Speter uint16_t sum; 73219019Sgabor 74219019Sgabor d->d_magic = le32dec(ptr + 0); 75219019Sgabor if (d->d_magic != DISKMAGIC) 76219019Sgabor return(EINVAL); 77252584Speter 78219019Sgabor d->d_magic2 = le32dec(ptr + 132); 79219019Sgabor if (d->d_magic2 != DISKMAGIC) { 80219019Sgabor return(EINVAL); 81219019Sgabor } 82219019Sgabor 83219019Sgabor d->d_npartitions = le16dec(ptr + 138); 84219019Sgabor if (d->d_npartitions > maxpart) { 85219019Sgabor return(EINVAL); 86219019Sgabor } 87219019Sgabor 88252584Speter pe = ptr + 148 + 16 * d->d_npartitions; 89219019Sgabor sum = 0; 90219019Sgabor for (p = ptr; p < pe; p += 2) 91219019Sgabor sum ^= le16dec(p); 92219019Sgabor if (sum != 0) { 93219019Sgabor return(EINVAL); 94219019Sgabor } 95219019Sgabor 96219019Sgabor d->d_type = le16dec(ptr + 4); 97219019Sgabor d->d_subtype = le16dec(ptr + 6); 98219019Sgabor bcopy(ptr + 8, d->d_typename, 16); 99219019Sgabor bcopy(ptr + 24, d->d_packname, 16); 100219019Sgabor d->d_secsize = le32dec(ptr + 40); 101219019Sgabor d->d_nsectors = le32dec(ptr + 44); 102219019Sgabor d->d_ntracks = le32dec(ptr + 48); 103219019Sgabor d->d_ncylinders = le32dec(ptr + 52); 104219019Sgabor d->d_secpercyl = le32dec(ptr + 56); 105219019Sgabor d->d_secperunit = le32dec(ptr + 60); 106219019Sgabor d->d_sparespertrack = le16dec(ptr + 64); 107219019Sgabor d->d_sparespercyl = le16dec(ptr + 66); 108219019Sgabor d->d_acylinders = le32dec(ptr + 68); 109219019Sgabor d->d_rpm = le16dec(ptr + 72); 110219019Sgabor d->d_interleave = le16dec(ptr + 74); 111219019Sgabor d->d_trackskew = le16dec(ptr + 76); 112219019Sgabor d->d_cylskew = le16dec(ptr + 78); 113219019Sgabor d->d_headswitch = le32dec(ptr + 80); 114219019Sgabor d->d_trkseek = le32dec(ptr + 84); 115219019Sgabor d->d_flags = le32dec(ptr + 88); 116219019Sgabor d->d_drivedata[0] = le32dec(ptr + 92); 117219019Sgabor d->d_drivedata[1] = le32dec(ptr + 96); 118219019Sgabor d->d_drivedata[2] = le32dec(ptr + 100); 119254080Speter d->d_drivedata[3] = le32dec(ptr + 104); 120254080Speter d->d_drivedata[4] = le32dec(ptr + 108); 121254080Speter d->d_spare[0] = le32dec(ptr + 112); 122254080Speter d->d_spare[1] = le32dec(ptr + 116); 123254080Speter d->d_spare[2] = le32dec(ptr + 120); 124254080Speter d->d_spare[3] = le32dec(ptr + 124); 125254080Speter d->d_spare[4] = le32dec(ptr + 128); 126254080Speter d->d_checksum = le16dec(ptr + 136); 127254080Speter d->d_npartitions = le16dec(ptr + 138); 128254080Speter d->d_bbsize = le32dec(ptr + 140); 129219019Sgabor d->d_sbsize = le32dec(ptr + 144); 130254080Speter for (i = 0; i < d->d_npartitions; i++) 131254080Speter bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]); 132254080Speter return(0); 133219019Sgabor} 134219019Sgabor 135219019Sgaborvoid 136219019Sgaborbsd_partition_le_enc(u_char *ptr, struct partition *d) 137219019Sgabor{ 138219019Sgabor le32enc(ptr + 0, d->p_size); 139219019Sgabor le32enc(ptr + 4, d->p_offset); 140219019Sgabor le32enc(ptr + 8, d->p_fsize); 141219019Sgabor ptr[12] = d->p_fstype; 142219019Sgabor ptr[13] = d->p_frag; 143219019Sgabor le16enc(ptr + 14, d->p_cpg); 144219019Sgabor} 145219019Sgabor 146219019Sgaborvoid 147219019Sgaborbsd_disklabel_le_enc(u_char *ptr, struct disklabel *d) 148219019Sgabor{ 149219019Sgabor int i; 150219019Sgabor u_char *p, *pe; 151219019Sgabor uint16_t sum; 152219019Sgabor 153219019Sgabor le32enc(ptr + 0, d->d_magic); 154219019Sgabor le16enc(ptr + 4, d->d_type); 155219019Sgabor le16enc(ptr + 6, d->d_subtype); 156219019Sgabor bcopy(d->d_typename, ptr + 8, 16); 157219019Sgabor bcopy(d->d_packname, ptr + 24, 16); 158219019Sgabor le32enc(ptr + 40, d->d_secsize); 159219019Sgabor le32enc(ptr + 44, d->d_nsectors); 160219019Sgabor le32enc(ptr + 48, d->d_ntracks); 161219019Sgabor le32enc(ptr + 52, d->d_ncylinders); 162219019Sgabor le32enc(ptr + 56, d->d_secpercyl); 163219019Sgabor le32enc(ptr + 60, d->d_secperunit); 164219019Sgabor le16enc(ptr + 64, d->d_sparespertrack); 165219019Sgabor le16enc(ptr + 66, d->d_sparespercyl); 166219019Sgabor le32enc(ptr + 68, d->d_acylinders); 167219019Sgabor le16enc(ptr + 72, d->d_rpm); 168219019Sgabor le16enc(ptr + 74, d->d_interleave); 169219019Sgabor le16enc(ptr + 76, d->d_trackskew); 170219019Sgabor le16enc(ptr + 78, d->d_cylskew); 171219019Sgabor le32enc(ptr + 80, d->d_headswitch); 172263986Stijl le32enc(ptr + 84, d->d_trkseek); 173263986Stijl le32enc(ptr + 88, d->d_flags); 174219019Sgabor le32enc(ptr + 92, d->d_drivedata[0]); 175263986Stijl le32enc(ptr + 96, d->d_drivedata[1]); 176219019Sgabor le32enc(ptr + 100, d->d_drivedata[2]); 177219019Sgabor le32enc(ptr + 104, d->d_drivedata[3]); 178219019Sgabor le32enc(ptr + 108, d->d_drivedata[4]); 179219019Sgabor le32enc(ptr + 112, d->d_spare[0]); 180219019Sgabor le32enc(ptr + 116, d->d_spare[1]); 181219019Sgabor le32enc(ptr + 120, d->d_spare[2]); 182219019Sgabor le32enc(ptr + 124, d->d_spare[3]); 183219019Sgabor le32enc(ptr + 128, d->d_spare[4]); 184219019Sgabor le32enc(ptr + 132, d->d_magic2); 185219019Sgabor le16enc(ptr + 136, 0); 186219019Sgabor le16enc(ptr + 138, d->d_npartitions); 187219019Sgabor le32enc(ptr + 140, d->d_bbsize); 188219019Sgabor le32enc(ptr + 144, d->d_sbsize); 189219019Sgabor for (i = 0; i < d->d_npartitions; i++) 190219019Sgabor bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]); 191219019Sgabor pe = ptr + 148 + 16 * d->d_npartitions; 192219019Sgabor sum = 0; 193219019Sgabor for (p = ptr; p < pe; p += 2) 194219019Sgabor sum ^= le16dec(p); 195219019Sgabor le16enc(ptr + 136, sum); 196219019Sgabor} 197219019Sgabor