bio.c revision 1.7
1/* $NetBSD: bio.c,v 1.7 2008/03/03 09:48:28 xtraeme Exp $ */ 2/* $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $ */ 3 4/* 5 * Copyright (c) 2002 Niklas Hallqvist. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* A device controller ioctl tunnelling device. */ 29 30#include <sys/cdefs.h> 31__KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.7 2008/03/03 09:48:28 xtraeme Exp $"); 32 33#include "opt_compat_netbsd.h" 34 35#include <sys/param.h> 36#include <sys/conf.h> 37#include <sys/device.h> 38#include <sys/event.h> 39#include <sys/ioctl.h> 40#include <sys/malloc.h> 41#include <sys/queue.h> 42#include <sys/systm.h> 43#include <sys/mutex.h> 44#include <sys/proc.h> 45#include <sys/kauth.h> 46 47#include <dev/biovar.h> 48 49struct bio_mapping { 50 LIST_ENTRY(bio_mapping) bm_link; 51 struct device *bm_dev; 52 int (*bm_ioctl)(struct device *, u_long, void *); 53}; 54 55static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 56static kmutex_t bio_lock; 57static bool bio_lock_initialized = false; 58 59static void bio_initialize(void); 60static int bioclose(dev_t, int, int, struct lwp *); 61static int bioioctl(dev_t, u_long, void *, int, struct lwp *); 62static int bioopen(dev_t, int, int, struct lwp *); 63 64static int bio_delegate_ioctl(void *, u_long, void *); 65static struct bio_mapping *bio_lookup(char *); 66static int bio_validate(void *); 67 68void bioattach(int); 69 70const struct cdevsw bio_cdevsw = { 71 bioopen, bioclose, noread, nowrite, bioioctl, 72 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER | D_MPSAFE 73}; 74 75 76static void 77bio_initialize(void) 78{ 79 if (bio_lock_initialized) 80 return; 81 82 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 83 bio_lock_initialized = true; 84} 85 86void 87bioattach(int nunits) 88{ 89 if (!bio_lock_initialized) 90 bio_initialize(); 91} 92 93static int 94bioopen(dev_t dev, int flags, int mode, struct lwp *l) 95{ 96 return 0; 97} 98 99static int 100bioclose(dev_t dev, int flags, int mode, struct lwp *l) 101{ 102 return 0; 103} 104 105static int 106bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 107{ 108 struct bio_locate *locate; 109 struct bio_common *common; 110 char name[16]; 111 int error; 112 113 switch(cmd) { 114 case BIOCLOCATE: 115 case BIOCINQ: 116 case BIOCDISK: 117 case BIOCDISK_NOVOL: 118 case BIOCVOL: 119#ifdef COMPAT_30 120 case OBIOCDISK: 121 case OBIOCVOL: 122#endif 123 error = kauth_authorize_device_passthru(l->l_cred, dev, 124 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 125 if (error) 126 return error; 127 break; 128 case BIOCBLINK: 129 case BIOCSETSTATE: 130 case BIOCVOLOPS: 131 error = kauth_authorize_device_passthru(l->l_cred, dev, 132 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 133 if (error) 134 return error; 135 break; 136 case BIOCALARM: { 137 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 138 switch (alarm->ba_opcode) { 139 case BIOC_SADISABLE: 140 case BIOC_SAENABLE: 141 case BIOC_SASILENCE: 142 case BIOC_SATEST: 143 error = kauth_authorize_device_passthru(l->l_cred, dev, 144 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 145 if (error) 146 return error; 147 break; 148 case BIOC_GASTATUS: 149 error = kauth_authorize_device_passthru(l->l_cred, dev, 150 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 151 if (error) 152 return error; 153 break; 154 default: 155 return EINVAL; 156 } 157 break; 158 } 159 default: 160 return ENOTTY; 161 } 162 163 switch (cmd) { 164 case BIOCLOCATE: 165 locate = addr; 166 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 167 if (error != 0) 168 return error; 169 locate->bl_cookie = bio_lookup(name); 170 if (locate->bl_cookie == NULL) 171 return ENOENT; 172 break; 173 174 default: 175 common = addr; 176 mutex_enter(&bio_lock); 177 if (!bio_validate(common->bc_cookie)) { 178 mutex_exit(&bio_lock); 179 return ENOENT; 180 } 181 mutex_exit(&bio_lock); 182#ifdef COMPAT_30 183 switch (cmd) { 184 case OBIOCDISK: { 185 struct bioc_disk *bd = 186 malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); 187 188 (void)memcpy(bd, addr, sizeof(struct obioc_disk)); 189 error = bio_delegate_ioctl(common->bc_cookie, 190 BIOCDISK, bd); 191 if (error) { 192 free(bd, M_DEVBUF); 193 return error; 194 } 195 196 (void)memcpy(addr, bd, sizeof(struct obioc_disk)); 197 free(bd, M_DEVBUF); 198 return 0; 199 } 200 case OBIOCVOL: { 201 struct bioc_vol *bv = 202 malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); 203 204 (void)memcpy(bv, addr, sizeof(struct obioc_vol)); 205 error = bio_delegate_ioctl(common->bc_cookie, 206 BIOCVOL, bv); 207 if (error) { 208 free(bv, M_DEVBUF); 209 return error; 210 } 211 212 (void)memcpy(addr, bv, sizeof(struct obioc_vol)); 213 free(bv, M_DEVBUF); 214 return 0; 215 } 216 } 217#endif 218 error = bio_delegate_ioctl(common->bc_cookie, cmd, addr); 219 return error; 220 } 221 return 0; 222} 223 224int 225bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, void *)) 226{ 227 struct bio_mapping *bm; 228 229 if (!bio_lock_initialized) 230 bio_initialize(); 231 232 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 233 if (bm == NULL) 234 return ENOMEM; 235 bm->bm_dev = dev; 236 bm->bm_ioctl = ioctl; 237 mutex_enter(&bio_lock); 238 LIST_INSERT_HEAD(&bios, bm, bm_link); 239 mutex_exit(&bio_lock); 240 return 0; 241} 242 243void 244bio_unregister(struct device *dev) 245{ 246 struct bio_mapping *bm, *next; 247 248 mutex_enter(&bio_lock); 249 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 250 next = LIST_NEXT(bm, bm_link); 251 252 if (dev == bm->bm_dev) { 253 LIST_REMOVE(bm, bm_link); 254 free(bm, M_DEVBUF); 255 } 256 } 257 mutex_exit(&bio_lock); 258} 259 260static struct bio_mapping * 261bio_lookup(char *name) 262{ 263 struct bio_mapping *bm; 264 265 mutex_enter(&bio_lock); 266 LIST_FOREACH(bm, &bios, bm_link) { 267 if (strcmp(name, bm->bm_dev->dv_xname) == 0) { 268 mutex_exit(&bio_lock); 269 return bm; 270 } 271 } 272 mutex_exit(&bio_lock); 273 return NULL; 274} 275 276static int 277bio_validate(void *cookie) 278{ 279 struct bio_mapping *bm; 280 281 LIST_FOREACH(bm, &bios, bm_link) 282 if (bm == cookie) 283 return 1; 284 285 return 0; 286} 287 288static int 289bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 290{ 291 struct bio_mapping *bm = cookie; 292 293 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 294} 295