bio.c revision 1.5
1 /* $NetBSD: bio.c,v 1.5 2008/01/02 23:45:03 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 1.5 2008/01/02 23:45:03 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 49 struct 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 55 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 56 static kmutex_t bio_lock; 57 static bool bio_lock_initialized = false; 58 59 static void bio_initialize(void); 60 void bioattach(int); 61 int bioclose(dev_t, int, int, struct lwp *); 62 int bioioctl(dev_t, u_long, void *, int, struct lwp *); 63 int bioopen(dev_t, int, int, struct lwp *); 64 65 int bio_delegate_ioctl(struct bio_mapping *, u_long, void *); 66 struct bio_mapping *bio_lookup(char *); 67 int bio_validate(void *); 68 69 const struct cdevsw bio_cdevsw = { 70 bioopen, bioclose, noread, nowrite, bioioctl, 71 nostop, notty, nopoll, nommap, nokqfilter, 0 72 }; 73 74 75 void 76 bio_initialize(void) 77 { 78 if (bio_lock_initialized) 79 return; 80 81 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 82 bio_lock_initialized = true; 83 } 84 85 void 86 bioattach(int nunits) 87 { 88 if (!bio_lock_initialized) 89 bio_initialize(); 90 } 91 92 int 93 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 94 { 95 return 0; 96 } 97 98 int 99 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 100 { 101 return 0; 102 } 103 104 int 105 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 106 { 107 struct bio_locate *locate; 108 struct bio_common *common; 109 #ifdef COMPAT_30 110 struct bioc_disk *bd; 111 struct bioc_vol *bv; 112 #endif 113 char name[16]; 114 int error; 115 116 switch(cmd) { 117 case BIOCLOCATE: 118 case BIOCINQ: 119 case BIOCDISK: 120 case BIOCDISK_NOVOL: 121 case BIOCVOL: 122 #ifdef COMPAT_30 123 case OBIOCDISK: 124 case OBIOCVOL: 125 #endif 126 error = kauth_authorize_device_passthru(l->l_cred, dev, 127 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 128 if (error) 129 return error; 130 break; 131 case BIOCBLINK: 132 case BIOCSETSTATE: 133 case BIOCVOLOPS: 134 error = kauth_authorize_device_passthru(l->l_cred, dev, 135 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 136 if (error) 137 return error; 138 break; 139 case BIOCALARM: { 140 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 141 switch (alarm->ba_opcode) { 142 case BIOC_SADISABLE: 143 case BIOC_SAENABLE: 144 case BIOC_SASILENCE: 145 case BIOC_SATEST: 146 error = kauth_authorize_device_passthru(l->l_cred, dev, 147 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 148 if (error) 149 return error; 150 break; 151 case BIOC_GASTATUS: 152 error = kauth_authorize_device_passthru(l->l_cred, dev, 153 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 154 if (error) 155 return error; 156 break; 157 default: 158 return EINVAL; 159 } 160 break; 161 } 162 default: 163 return ENOTTY; 164 } 165 166 switch (cmd) { 167 case BIOCLOCATE: 168 locate = (struct bio_locate *)addr; 169 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 170 if (error != 0) 171 return error; 172 locate->bl_cookie = bio_lookup(name); 173 if (locate->bl_cookie == NULL) 174 return ENOENT; 175 break; 176 177 default: 178 common = (struct bio_common *)addr; 179 mutex_enter(&bio_lock); 180 if (!bio_validate(common->bc_cookie)) { 181 mutex_exit(&bio_lock); 182 return ENOENT; 183 } 184 mutex_exit(&bio_lock); 185 #ifdef COMPAT_30 186 switch (cmd) { 187 case OBIOCDISK: 188 { 189 bd = malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); 190 191 memcpy(bd, addr, sizeof(struct obioc_disk)); 192 error = bio_delegate_ioctl( 193 (struct bio_mapping *)common->bc_cookie, 194 BIOCDISK, bd); 195 if (error) { 196 free(bd, M_DEVBUF); 197 return error; 198 } 199 200 memcpy(addr, bd, sizeof(struct obioc_disk)); 201 free(bd, M_DEVBUF); 202 return 0; 203 } 204 case OBIOCVOL: 205 { 206 bv = malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); 207 208 memcpy(bv, addr, sizeof(struct obioc_vol)); 209 error = bio_delegate_ioctl( 210 (struct bio_mapping *)common->bc_cookie, 211 BIOCVOL, bv); 212 if (error) { 213 free(bv, M_DEVBUF); 214 return error; 215 } 216 217 memcpy(addr, bv, sizeof(struct obioc_vol)); 218 free(bv, M_DEVBUF); 219 return 0; 220 } 221 } 222 #endif 223 error = bio_delegate_ioctl( 224 (struct bio_mapping *)common->bc_cookie, cmd, addr); 225 return error; 226 } 227 return 0; 228 } 229 230 int 231 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, void *)) 232 { 233 struct bio_mapping *bm; 234 235 if (!bio_lock_initialized) 236 bio_initialize(); 237 238 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 239 if (bm == NULL) 240 return ENOMEM; 241 bm->bm_dev = dev; 242 bm->bm_ioctl = ioctl; 243 mutex_enter(&bio_lock); 244 LIST_INSERT_HEAD(&bios, bm, bm_link); 245 mutex_exit(&bio_lock); 246 return 0; 247 } 248 249 void 250 bio_unregister(struct device *dev) 251 { 252 struct bio_mapping *bm, *next; 253 254 mutex_enter(&bio_lock); 255 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 256 next = LIST_NEXT(bm, bm_link); 257 258 if (dev == bm->bm_dev) { 259 LIST_REMOVE(bm, bm_link); 260 free(bm, M_DEVBUF); 261 } 262 } 263 mutex_exit(&bio_lock); 264 } 265 266 struct bio_mapping * 267 bio_lookup(char *name) 268 { 269 struct bio_mapping *bm; 270 271 mutex_enter(&bio_lock); 272 LIST_FOREACH(bm, &bios, bm_link) { 273 if (strcmp(name, bm->bm_dev->dv_xname) == 0) { 274 mutex_exit(&bio_lock); 275 return bm; 276 } 277 } 278 mutex_exit(&bio_lock); 279 return NULL; 280 } 281 282 int 283 bio_validate(void *cookie) 284 { 285 struct bio_mapping *bm; 286 287 LIST_FOREACH(bm, &bios, bm_link) 288 if (bm == cookie) 289 return 1; 290 291 return 0; 292 } 293 294 int 295 bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, void *addr) 296 { 297 298 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 299 } 300
Indexes created Sun Oct 12 22:09:51 GMT 2025