| 1 | /* $NetBSD: bio.c,v 1.13 2015/08/20 14:40:17 christos 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 1.13 2015/08/20 14:40:17 christos 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 | #include <dev/sysmon/sysmonvar.h> |
| 49 | |
| 50 | #include "ioconf.h" |
| 51 | |
| 52 | struct bio_mapping { |
| 53 | LIST_ENTRY(bio_mapping) bm_link; |
| 54 | device_t bm_dev; |
| 55 | int (*bm_ioctl)(device_t, u_long, void *); |
| 56 | }; |
| 57 | |
| 58 | static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); |
| 59 | static kmutex_t bio_lock; |
| 60 | static bool bio_lock_initialized = false; |
| 61 | |
| 62 | static void bio_initialize(void); |
| 63 | static int bioclose(dev_t, int, int, struct lwp *); |
| 64 | static int bioioctl(dev_t, u_long, void *, int, struct lwp *); |
| 65 | static int bioopen(dev_t, int, int, struct lwp *); |
| 66 | |
| 67 | static int bio_delegate_ioctl(void *, u_long, void *); |
| 68 | static struct bio_mapping *bio_lookup(char *); |
| 69 | static int bio_validate(void *); |
| 70 | |
| 71 | const struct cdevsw bio_cdevsw = { |
| 72 | .d_open = bioopen, |
| 73 | .d_close = bioclose, |
| 74 | .d_read = noread, |
| 75 | .d_write = nowrite, |
| 76 | .d_ioctl = bioioctl, |
| 77 | .d_stop = nostop, |
| 78 | .d_tty = notty, |
| 79 | .d_poll = nopoll, |
| 80 | .d_mmap = nommap, |
| 81 | .d_kqfilter = nokqfilter, |
| 82 | .d_discard = nodiscard, |
| 83 | .d_flag = D_OTHER | D_MPSAFE |
| 84 | }; |
| 85 | |
| 86 | |
| 87 | static void |
| 88 | bio_initialize(void) |
| 89 | { |
| 90 | if (bio_lock_initialized) |
| 91 | return; |
| 92 | |
| 93 | mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); |
| 94 | bio_lock_initialized = true; |
| 95 | } |
| 96 | |
| 97 | void |
| 98 | bioattach(int nunits) |
| 99 | { |
| 100 | if (!bio_lock_initialized) |
| 101 | bio_initialize(); |
| 102 | } |
| 103 | |
| 104 | static int |
| 105 | bioopen(dev_t dev, int flags, int mode, struct lwp *l) |
| 106 | { |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int |
| 111 | bioclose(dev_t dev, int flags, int mode, struct lwp *l) |
| 112 | { |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static int |
| 117 | bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) |
| 118 | { |
| 119 | struct bio_locate *locate; |
| 120 | struct bio_common *common; |
| 121 | char name[16]; |
| 122 | int error; |
| 123 | |
| 124 | switch(cmd) { |
| 125 | case BIOCLOCATE: |
| 126 | case BIOCINQ: |
| 127 | case BIOCDISK: |
| 128 | case BIOCDISK_NOVOL: |
| 129 | case BIOCVOL: |
| 130 | #ifdef COMPAT_30 |
| 131 | case OBIOCDISK: |
| 132 | case OBIOCVOL: |
| 133 | #endif |
| 134 | error = kauth_authorize_device_passthru(l->l_cred, dev, |
| 135 | KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); |
| 136 | if (error) |
| 137 | return error; |
| 138 | break; |
| 139 | case BIOCBLINK: |
| 140 | case BIOCSETSTATE: |
| 141 | case BIOCVOLOPS: |
| 142 | error = kauth_authorize_device_passthru(l->l_cred, dev, |
| 143 | KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); |
| 144 | if (error) |
| 145 | return error; |
| 146 | break; |
| 147 | case BIOCALARM: { |
| 148 | struct bioc_alarm *alarm = (struct bioc_alarm *)addr; |
| 149 | switch (alarm->ba_opcode) { |
| 150 | case BIOC_SADISABLE: |
| 151 | case BIOC_SAENABLE: |
| 152 | case BIOC_SASILENCE: |
| 153 | case BIOC_SATEST: |
| 154 | error = kauth_authorize_device_passthru(l->l_cred, dev, |
| 155 | KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); |
| 156 | if (error) |
| 157 | return error; |
| 158 | break; |
| 159 | case BIOC_GASTATUS: |
| 160 | error = kauth_authorize_device_passthru(l->l_cred, dev, |
| 161 | KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); |
| 162 | if (error) |
| 163 | return error; |
| 164 | break; |
| 165 | default: |
| 166 | return EINVAL; |
| 167 | } |
| 168 | break; |
| 169 | } |
| 170 | default: |
| 171 | return ENOTTY; |
| 172 | } |
| 173 | |
| 174 | switch (cmd) { |
| 175 | case BIOCLOCATE: |
| 176 | locate = addr; |
| 177 | error = copyinstr(locate->bl_name, name, sizeof(name), NULL); |
| 178 | if (error != 0) |
| 179 | return error; |
| 180 | locate->bl_cookie = bio_lookup(name); |
| 181 | if (locate->bl_cookie == NULL) |
| 182 | return ENOENT; |
| 183 | break; |
| 184 | |
| 185 | default: |
| 186 | common = addr; |
| 187 | mutex_enter(&bio_lock); |
| 188 | if (!bio_validate(common->bc_cookie)) { |
| 189 | mutex_exit(&bio_lock); |
| 190 | return ENOENT; |
| 191 | } |
| 192 | mutex_exit(&bio_lock); |
| 193 | #ifdef COMPAT_30 |
| 194 | switch (cmd) { |
| 195 | case OBIOCDISK: { |
| 196 | struct bioc_disk *bd = |
| 197 | malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); |
| 198 | |
| 199 | (void)memcpy(bd, addr, sizeof(struct obioc_disk)); |
| 200 | error = bio_delegate_ioctl(common->bc_cookie, |
| 201 | BIOCDISK, bd); |
| 202 | if (error) { |
| 203 | free(bd, M_DEVBUF); |
| 204 | return error; |
| 205 | } |
| 206 | |
| 207 | (void)memcpy(addr, bd, sizeof(struct obioc_disk)); |
| 208 | free(bd, M_DEVBUF); |
| 209 | return 0; |
| 210 | } |
| 211 | case OBIOCVOL: { |
| 212 | struct bioc_vol *bv = |
| 213 | malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); |
| 214 | |
| 215 | (void)memcpy(bv, addr, sizeof(struct obioc_vol)); |
| 216 | error = bio_delegate_ioctl(common->bc_cookie, |
| 217 | BIOCVOL, bv); |
| 218 | if (error) { |
| 219 | free(bv, M_DEVBUF); |
| 220 | return error; |
| 221 | } |
| 222 | |
| 223 | (void)memcpy(addr, bv, sizeof(struct obioc_vol)); |
| 224 | free(bv, M_DEVBUF); |
| 225 | return 0; |
| 226 | } |
| 227 | } |
| 228 | #endif |
| 229 | error = bio_delegate_ioctl(common->bc_cookie, cmd, addr); |
| 230 | return error; |
| 231 | } |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | int |
| 236 | bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) |
| 237 | { |
| 238 | struct bio_mapping *bm; |
| 239 | |
| 240 | if (!bio_lock_initialized) |
| 241 | bio_initialize(); |
| 242 | |
| 243 | bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); |
| 244 | if (bm == NULL) |
| 245 | return ENOMEM; |
| 246 | bm->bm_dev = dev; |
| 247 | bm->bm_ioctl = ioctl; |
| 248 | mutex_enter(&bio_lock); |
| 249 | LIST_INSERT_HEAD(&bios, bm, bm_link); |
| 250 | mutex_exit(&bio_lock); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | void |
| 255 | bio_unregister(device_t dev) |
| 256 | { |
| 257 | struct bio_mapping *bm, *next; |
| 258 | |
| 259 | mutex_enter(&bio_lock); |
| 260 | for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { |
| 261 | next = LIST_NEXT(bm, bm_link); |
| 262 | |
| 263 | if (dev == bm->bm_dev) { |
| 264 | LIST_REMOVE(bm, bm_link); |
| 265 | free(bm, M_DEVBUF); |
| 266 | } |
| 267 | } |
| 268 | mutex_exit(&bio_lock); |
| 269 | } |
| 270 | |
| 271 | static struct bio_mapping * |
| 272 | bio_lookup(char *name) |
| 273 | { |
| 274 | struct bio_mapping *bm; |
| 275 | |
| 276 | mutex_enter(&bio_lock); |
| 277 | LIST_FOREACH(bm, &bios, bm_link) { |
| 278 | if (strcmp(name, device_xname(bm->bm_dev)) == 0) { |
| 279 | mutex_exit(&bio_lock); |
| 280 | return bm; |
| 281 | } |
| 282 | } |
| 283 | mutex_exit(&bio_lock); |
| 284 | return NULL; |
| 285 | } |
| 286 | |
| 287 | static int |
| 288 | bio_validate(void *cookie) |
| 289 | { |
| 290 | struct bio_mapping *bm; |
| 291 | |
| 292 | LIST_FOREACH(bm, &bios, bm_link) |
| 293 | if (bm == cookie) |
| 294 | return 1; |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static int |
| 300 | bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) |
| 301 | { |
| 302 | struct bio_mapping *bm = cookie; |
| 303 | |
| 304 | return bm->bm_ioctl(bm->bm_dev, cmd, addr); |
| 305 | } |
| 306 | |
| 307 | void |
| 308 | bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd) |
| 309 | { |
| 310 | switch (bd->bd_status) { |
| 311 | case BIOC_SDONLINE: |
| 312 | edata->value_cur = ENVSYS_DRIVE_ONLINE; |
| 313 | edata->state = ENVSYS_SVALID; |
| 314 | break; |
| 315 | case BIOC_SDOFFLINE: |
| 316 | edata->value_cur = ENVSYS_DRIVE_OFFLINE; |
| 317 | edata->state = ENVSYS_SCRITICAL; |
| 318 | break; |
| 319 | default: |
| 320 | edata->value_cur = ENVSYS_DRIVE_FAIL; |
| 321 | edata->state = ENVSYS_SCRITICAL; |
| 322 | break; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | void |
| 327 | bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv) |
| 328 | { |
| 329 | switch (bv->bv_status) { |
| 330 | case BIOC_SVOFFLINE: |
| 331 | edata->value_cur = ENVSYS_DRIVE_OFFLINE; |
| 332 | edata->state = ENVSYS_SCRITICAL; |
| 333 | break; |
| 334 | case BIOC_SVDEGRADED: |
| 335 | edata->value_cur = ENVSYS_DRIVE_PFAIL; |
| 336 | edata->state = ENVSYS_SCRITICAL; |
| 337 | break; |
| 338 | case BIOC_SVBUILDING: |
| 339 | edata->value_cur = ENVSYS_DRIVE_BUILD; |
| 340 | edata->state = ENVSYS_SVALID; |
| 341 | break; |
| 342 | case BIOC_SVMIGRATING: |
| 343 | edata->value_cur = ENVSYS_DRIVE_MIGRATING; |
| 344 | edata->state = ENVSYS_SVALID; |
| 345 | break; |
| 346 | case BIOC_SVCHECKING: |
| 347 | edata->value_cur = ENVSYS_DRIVE_CHECK; |
| 348 | edata->state = ENVSYS_SVALID; |
| 349 | break; |
| 350 | case BIOC_SVREBUILD: |
| 351 | edata->value_cur = ENVSYS_DRIVE_REBUILD; |
| 352 | edata->state = ENVSYS_SCRITICAL; |
| 353 | break; |
| 354 | case BIOC_SVSCRUB: |
| 355 | case BIOC_SVONLINE: |
| 356 | edata->value_cur = ENVSYS_DRIVE_ONLINE; |
| 357 | edata->state = ENVSYS_SVALID; |
| 358 | break; |
| 359 | case BIOC_SVINVALID: |
| 360 | /* FALLTHROUGH */ |
| 361 | default: |
| 362 | edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */ |
| 363 | edata->state = ENVSYS_SINVALID; |
| 364 | break; |
| 365 | } |
| 366 | } |
| 367 | |