bio.c revision 1.11
1 /* $NetBSD: bio.c,v 1.11 2014/07/25 08:10:35 dholland 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 1.11 2014/07/25 08:10:35 dholland 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_discard = nodiscard, 82 .d_flag = D_OTHER | D_MPSAFE 83 }; 84 85 86 static void 87 bio_initialize(void) 88 { 89 if (bio_lock_initialized) 90 return; 91 92 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 93 bio_lock_initialized = true; 94 } 95 96 void 97 bioattach(int nunits) 98 { 99 if (!bio_lock_initialized) 100 bio_initialize(); 101 } 102 103 static int 104 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 105 { 106 return 0; 107 } 108 109 static int 110 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 111 { 112 return 0; 113 } 114 115 static int 116 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 117 { 118 struct bio_locate *locate; 119 struct bio_common *common; 120 char name[16]; 121 int error; 122 123 switch(cmd) { 124 case BIOCLOCATE: 125 case BIOCINQ: 126 case BIOCDISK: 127 case BIOCDISK_NOVOL: 128 case BIOCVOL: 129 #ifdef COMPAT_30 130 case OBIOCDISK: 131 case OBIOCVOL: 132 #endif 133 error = kauth_authorize_device_passthru(l->l_cred, dev, 134 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 135 if (error) 136 return error; 137 break; 138 case BIOCBLINK: 139 case BIOCSETSTATE: 140 case BIOCVOLOPS: 141 error = kauth_authorize_device_passthru(l->l_cred, dev, 142 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 143 if (error) 144 return error; 145 break; 146 case BIOCALARM: { 147 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 148 switch (alarm->ba_opcode) { 149 case BIOC_SADISABLE: 150 case BIOC_SAENABLE: 151 case BIOC_SASILENCE: 152 case BIOC_SATEST: 153 error = kauth_authorize_device_passthru(l->l_cred, dev, 154 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 155 if (error) 156 return error; 157 break; 158 case BIOC_GASTATUS: 159 error = kauth_authorize_device_passthru(l->l_cred, dev, 160 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 161 if (error) 162 return error; 163 break; 164 default: 165 return EINVAL; 166 } 167 break; 168 } 169 default: 170 return ENOTTY; 171 } 172 173 switch (cmd) { 174 case BIOCLOCATE: 175 locate = addr; 176 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 177 if (error != 0) 178 return error; 179 locate->bl_cookie = bio_lookup(name); 180 if (locate->bl_cookie == NULL) 181 return ENOENT; 182 break; 183 184 default: 185 common = addr; 186 mutex_enter(&bio_lock); 187 if (!bio_validate(common->bc_cookie)) { 188 mutex_exit(&bio_lock); 189 return ENOENT; 190 } 191 mutex_exit(&bio_lock); 192 #ifdef COMPAT_30 193 switch (cmd) { 194 case OBIOCDISK: { 195 struct bioc_disk *bd = 196 malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); 197 198 (void)memcpy(bd, addr, sizeof(struct obioc_disk)); 199 error = bio_delegate_ioctl(common->bc_cookie, 200 BIOCDISK, bd); 201 if (error) { 202 free(bd, M_DEVBUF); 203 return error; 204 } 205 206 (void)memcpy(addr, bd, sizeof(struct obioc_disk)); 207 free(bd, M_DEVBUF); 208 return 0; 209 } 210 case OBIOCVOL: { 211 struct bioc_vol *bv = 212 malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); 213 214 (void)memcpy(bv, addr, sizeof(struct obioc_vol)); 215 error = bio_delegate_ioctl(common->bc_cookie, 216 BIOCVOL, bv); 217 if (error) { 218 free(bv, M_DEVBUF); 219 return error; 220 } 221 222 (void)memcpy(addr, bv, sizeof(struct obioc_vol)); 223 free(bv, M_DEVBUF); 224 return 0; 225 } 226 } 227 #endif 228 error = bio_delegate_ioctl(common->bc_cookie, cmd, addr); 229 return error; 230 } 231 return 0; 232 } 233 234 int 235 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 236 { 237 struct bio_mapping *bm; 238 239 if (!bio_lock_initialized) 240 bio_initialize(); 241 242 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 243 if (bm == NULL) 244 return ENOMEM; 245 bm->bm_dev = dev; 246 bm->bm_ioctl = ioctl; 247 mutex_enter(&bio_lock); 248 LIST_INSERT_HEAD(&bios, bm, bm_link); 249 mutex_exit(&bio_lock); 250 return 0; 251 } 252 253 void 254 bio_unregister(device_t dev) 255 { 256 struct bio_mapping *bm, *next; 257 258 mutex_enter(&bio_lock); 259 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 260 next = LIST_NEXT(bm, bm_link); 261 262 if (dev == bm->bm_dev) { 263 LIST_REMOVE(bm, bm_link); 264 free(bm, M_DEVBUF); 265 } 266 } 267 mutex_exit(&bio_lock); 268 } 269 270 static struct bio_mapping * 271 bio_lookup(char *name) 272 { 273 struct bio_mapping *bm; 274 275 mutex_enter(&bio_lock); 276 LIST_FOREACH(bm, &bios, bm_link) { 277 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 278 mutex_exit(&bio_lock); 279 return bm; 280 } 281 } 282 mutex_exit(&bio_lock); 283 return NULL; 284 } 285 286 static int 287 bio_validate(void *cookie) 288 { 289 struct bio_mapping *bm; 290 291 LIST_FOREACH(bm, &bios, bm_link) 292 if (bm == cookie) 293 return 1; 294 295 return 0; 296 } 297 298 static int 299 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 300 { 301 struct bio_mapping *bm = cookie; 302 303 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 304 } 305
Indexes created Sun Oct 12 22:09:51 GMT 2025