bio.c revision 1.9.12.1
1 /* $NetBSD: bio.c,v 1.9.12.1 2014/05/22 11:40:19 yamt 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 1.9.12.1 2014/05/22 11:40:19 yamt 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 device_t bm_dev; 52 int (*bm_ioctl)(device_t, u_long, void *); 53 }; 54 55 static 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 static int bioclose(dev_t, int, int, struct lwp *); 61 static int bioioctl(dev_t, u_long, void *, int, struct lwp *); 62 static int bioopen(dev_t, int, int, struct lwp *); 63 64 static int bio_delegate_ioctl(void *, u_long, void *); 65 static struct bio_mapping *bio_lookup(char *); 66 static int bio_validate(void *); 67 68 void bioattach(int); 69 70 const struct cdevsw bio_cdevsw = { 71 .d_open = bioopen, 72 .d_close = bioclose, 73 .d_read = noread, 74 .d_write = nowrite, 75 .d_ioctl = bioioctl, 76 .d_stop = nostop, 77 .d_tty = notty, 78 .d_poll = nopoll, 79 .d_mmap = nommap, 80 .d_kqfilter = nokqfilter, 81 .d_flag = D_OTHER | D_MPSAFE 82 }; 83 84 85 static void 86 bio_initialize(void) 87 { 88 if (bio_lock_initialized) 89 return; 90 91 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 92 bio_lock_initialized = true; 93 } 94 95 void 96 bioattach(int nunits) 97 { 98 if (!bio_lock_initialized) 99 bio_initialize(); 100 } 101 102 static int 103 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 104 { 105 return 0; 106 } 107 108 static int 109 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 110 { 111 return 0; 112 } 113 114 static int 115 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 116 { 117 struct bio_locate *locate; 118 struct bio_common *common; 119 char name[16]; 120 int error; 121 122 switch(cmd) { 123 case BIOCLOCATE: 124 case BIOCINQ: 125 case BIOCDISK: 126 case BIOCDISK_NOVOL: 127 case BIOCVOL: 128 #ifdef COMPAT_30 129 case OBIOCDISK: 130 case OBIOCVOL: 131 #endif 132 error = kauth_authorize_device_passthru(l->l_cred, dev, 133 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 134 if (error) 135 return error; 136 break; 137 case BIOCBLINK: 138 case BIOCSETSTATE: 139 case BIOCVOLOPS: 140 error = kauth_authorize_device_passthru(l->l_cred, dev, 141 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 142 if (error) 143 return error; 144 break; 145 case BIOCALARM: { 146 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 147 switch (alarm->ba_opcode) { 148 case BIOC_SADISABLE: 149 case BIOC_SAENABLE: 150 case BIOC_SASILENCE: 151 case BIOC_SATEST: 152 error = kauth_authorize_device_passthru(l->l_cred, dev, 153 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 154 if (error) 155 return error; 156 break; 157 case BIOC_GASTATUS: 158 error = kauth_authorize_device_passthru(l->l_cred, dev, 159 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 160 if (error) 161 return error; 162 break; 163 default: 164 return EINVAL; 165 } 166 break; 167 } 168 default: 169 return ENOTTY; 170 } 171 172 switch (cmd) { 173 case BIOCLOCATE: 174 locate = addr; 175 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 176 if (error != 0) 177 return error; 178 locate->bl_cookie = bio_lookup(name); 179 if (locate->bl_cookie == NULL) 180 return ENOENT; 181 break; 182 183 default: 184 common = addr; 185 mutex_enter(&bio_lock); 186 if (!bio_validate(common->bc_cookie)) { 187 mutex_exit(&bio_lock); 188 return ENOENT; 189 } 190 mutex_exit(&bio_lock); 191 #ifdef COMPAT_30 192 switch (cmd) { 193 case OBIOCDISK: { 194 struct bioc_disk *bd = 195 malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); 196 197 (void)memcpy(bd, addr, sizeof(struct obioc_disk)); 198 error = bio_delegate_ioctl(common->bc_cookie, 199 BIOCDISK, bd); 200 if (error) { 201 free(bd, M_DEVBUF); 202 return error; 203 } 204 205 (void)memcpy(addr, bd, sizeof(struct obioc_disk)); 206 free(bd, M_DEVBUF); 207 return 0; 208 } 209 case OBIOCVOL: { 210 struct bioc_vol *bv = 211 malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); 212 213 (void)memcpy(bv, addr, sizeof(struct obioc_vol)); 214 error = bio_delegate_ioctl(common->bc_cookie, 215 BIOCVOL, bv); 216 if (error) { 217 free(bv, M_DEVBUF); 218 return error; 219 } 220 221 (void)memcpy(addr, bv, sizeof(struct obioc_vol)); 222 free(bv, M_DEVBUF); 223 return 0; 224 } 225 } 226 #endif 227 error = bio_delegate_ioctl(common->bc_cookie, cmd, addr); 228 return error; 229 } 230 return 0; 231 } 232 233 int 234 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 235 { 236 struct bio_mapping *bm; 237 238 if (!bio_lock_initialized) 239 bio_initialize(); 240 241 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 242 if (bm == NULL) 243 return ENOMEM; 244 bm->bm_dev = dev; 245 bm->bm_ioctl = ioctl; 246 mutex_enter(&bio_lock); 247 LIST_INSERT_HEAD(&bios, bm, bm_link); 248 mutex_exit(&bio_lock); 249 return 0; 250 } 251 252 void 253 bio_unregister(device_t dev) 254 { 255 struct bio_mapping *bm, *next; 256 257 mutex_enter(&bio_lock); 258 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 259 next = LIST_NEXT(bm, bm_link); 260 261 if (dev == bm->bm_dev) { 262 LIST_REMOVE(bm, bm_link); 263 free(bm, M_DEVBUF); 264 } 265 } 266 mutex_exit(&bio_lock); 267 } 268 269 static struct bio_mapping * 270 bio_lookup(char *name) 271 { 272 struct bio_mapping *bm; 273 274 mutex_enter(&bio_lock); 275 LIST_FOREACH(bm, &bios, bm_link) { 276 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 277 mutex_exit(&bio_lock); 278 return bm; 279 } 280 } 281 mutex_exit(&bio_lock); 282 return NULL; 283 } 284 285 static int 286 bio_validate(void *cookie) 287 { 288 struct bio_mapping *bm; 289 290 LIST_FOREACH(bm, &bios, bm_link) 291 if (bm == cookie) 292 return 1; 293 294 return 0; 295 } 296 297 static int 298 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 299 { 300 struct bio_mapping *bm = cookie; 301 302 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 303 } 304
Indexes created Mon Oct 13 01:09:56 GMT 2025