Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_mib.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999 Marcel Moolenaar 5 * 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/sdt.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/mount.h> 40 #include <sys/jail.h> 41 #include <sys/lock.h> 42 #include <sys/sx.h> 43 44 #include <compat/linux/linux_mib.h> 45 #include <compat/linux/linux_misc.h> 46 47 struct linux_prison { 48 char pr_osname[LINUX_MAX_UTSNAME]; 49 char pr_osrelease[LINUX_MAX_UTSNAME]; 50 int pr_oss_version; 51 int pr_osrel; 52 }; 53 54 static struct linux_prison lprison0 = { 55 .pr_osname = "Linux", 56 .pr_osrelease = LINUX_VERSION_STR, 57 .pr_oss_version = 0x030600, 58 .pr_osrel = LINUX_VERSION_CODE 59 }; 60 61 static unsigned linux_osd_jail_slot; 62 63 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode"); 64 65 int linux_debug = 1; 66 SYSCTL_INT(_compat_linux, OID_AUTO, debug, CTLFLAG_RWTUN, 67 &linux_debug, 0, "Log warnings from linux(4); or 0 to disable"); 68 69 int linux_default_openfiles = 1024; 70 SYSCTL_INT(_compat_linux, OID_AUTO, default_openfiles, CTLFLAG_RWTUN, 71 &linux_default_openfiles, 0, 72 "Default soft openfiles resource limit, or -1 for unlimited"); 73 74 int linux_ignore_ip_recverr = 1; 75 SYSCTL_INT(_compat_linux, OID_AUTO, ignore_ip_recverr, CTLFLAG_RWTUN, 76 &linux_ignore_ip_recverr, 0, "Ignore enabling IP_RECVERR"); 77 78 int linux_preserve_vstatus = 0; 79 SYSCTL_INT(_compat_linux, OID_AUTO, preserve_vstatus, CTLFLAG_RWTUN, 80 &linux_preserve_vstatus, 0, "Preserve VSTATUS termios(4) flag"); 81 82 bool linux_map_sched_prio = true; 83 SYSCTL_BOOL(_compat_linux, OID_AUTO, map_sched_prio, CTLFLAG_RDTUN, 84 &linux_map_sched_prio, 0, "Map scheduler priorities to Linux priorities " 85 "(not POSIX compliant)"); 86 87 static int linux_set_osname(struct thread *td, char *osname); 88 static int linux_set_osrelease(struct thread *td, char *osrelease); 89 static int linux_set_oss_version(struct thread *td, int oss_version); 90 91 static int 92 linux_sysctl_osname(SYSCTL_HANDLER_ARGS) 93 { 94 char osname[LINUX_MAX_UTSNAME]; 95 int error; 96 97 linux_get_osname(req->td, osname); 98 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req); 99 if (error != 0 || req->newptr == NULL) 100 return (error); 101 error = linux_set_osname(req->td, osname); 102 103 return (error); 104 } 105 106 SYSCTL_PROC(_compat_linux, OID_AUTO, osname, 107 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 108 0, 0, linux_sysctl_osname, "A", 109 "Linux kernel OS name"); 110 111 static int 112 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS) 113 { 114 char osrelease[LINUX_MAX_UTSNAME]; 115 int error; 116 117 linux_get_osrelease(req->td, osrelease); 118 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req); 119 if (error != 0 || req->newptr == NULL) 120 return (error); 121 error = linux_set_osrelease(req->td, osrelease); 122 123 return (error); 124 } 125 126 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease, 127 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 128 0, 0, linux_sysctl_osrelease, "A", 129 "Linux kernel OS release"); 130 131 static int 132 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS) 133 { 134 int oss_version; 135 int error; 136 137 oss_version = linux_get_oss_version(req->td); 138 error = sysctl_handle_int(oidp, &oss_version, 0, req); 139 if (error != 0 || req->newptr == NULL) 140 return (error); 141 error = linux_set_oss_version(req->td, oss_version); 142 143 return (error); 144 } 145 146 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version, 147 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 148 0, 0, linux_sysctl_oss_version, "I", 149 "Linux OSS version"); 150 151 /* 152 * Map the osrelease into integer 153 */ 154 static int 155 linux_map_osrel(char *osrelease, int *osrel) 156 { 157 char *sep, *eosrelease; 158 int len, v0, v1, v2, v; 159 160 len = strlen(osrelease); 161 eosrelease = osrelease + len; 162 v0 = strtol(osrelease, &sep, 10); 163 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 164 return (EINVAL); 165 osrelease = sep + 1; 166 v1 = strtol(osrelease, &sep, 10); 167 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 168 return (EINVAL); 169 osrelease = sep + 1; 170 v2 = strtol(osrelease, &sep, 10); 171 if (osrelease == sep || 172 (sep != eosrelease && (sep + 1 >= eosrelease || *sep != '-'))) 173 return (EINVAL); 174 175 v = LINUX_KERNVER(v0, v1, v2); 176 if (v < LINUX_KERNVER(1, 0, 0)) 177 return (EINVAL); 178 179 if (osrel != NULL) 180 *osrel = v; 181 182 return (0); 183 } 184 185 /* 186 * Find a prison with Linux info. 187 * Return the Linux info and the (locked) prison. 188 */ 189 static struct linux_prison * 190 linux_find_prison(struct prison *spr, struct prison **prp) 191 { 192 struct prison *pr; 193 struct linux_prison *lpr; 194 195 for (pr = spr;; pr = pr->pr_parent) { 196 mtx_lock(&pr->pr_mtx); 197 lpr = (pr == &prison0) 198 ? &lprison0 199 : osd_jail_get(pr, linux_osd_jail_slot); 200 if (lpr != NULL) 201 break; 202 mtx_unlock(&pr->pr_mtx); 203 } 204 *prp = pr; 205 206 return (lpr); 207 } 208 209 /* 210 * Ensure a prison has its own Linux info. If lprp is non-null, point it to 211 * the Linux info and lock the prison. 212 */ 213 static void 214 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp) 215 { 216 struct prison *ppr; 217 struct linux_prison *lpr, *nlpr; 218 void **rsv; 219 220 /* If this prison already has Linux info, return that. */ 221 lpr = linux_find_prison(pr, &ppr); 222 if (ppr == pr) 223 goto done; 224 /* 225 * Allocate a new info record. Then check again, in case something 226 * changed during the allocation. 227 */ 228 mtx_unlock(&ppr->pr_mtx); 229 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK); 230 rsv = osd_reserve(linux_osd_jail_slot); 231 lpr = linux_find_prison(pr, &ppr); 232 if (ppr == pr) { 233 free(nlpr, M_PRISON); 234 osd_free_reserved(rsv); 235 goto done; 236 } 237 /* Inherit the initial values from the ancestor. */ 238 mtx_lock(&pr->pr_mtx); 239 (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr); 240 bcopy(lpr, nlpr, sizeof(*lpr)); 241 lpr = nlpr; 242 mtx_unlock(&ppr->pr_mtx); 243 done: 244 if (lprp != NULL) 245 *lprp = lpr; 246 else 247 mtx_unlock(&pr->pr_mtx); 248 } 249 250 /* 251 * Jail OSD methods for Linux prison data. 252 */ 253 static int 254 linux_prison_create(void *obj, void *data) 255 { 256 struct prison *pr = obj; 257 struct vfsoptlist *opts = data; 258 int jsys; 259 260 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 && 261 jsys == JAIL_SYS_INHERIT) 262 return (0); 263 /* 264 * Inherit a prison's initial values from its parent 265 * (different from JAIL_SYS_INHERIT which also inherits changes). 266 */ 267 linux_alloc_prison(pr, NULL); 268 return (0); 269 } 270 271 static int 272 linux_prison_check(void *obj __unused, void *data) 273 { 274 struct vfsoptlist *opts = data; 275 char *osname, *osrelease; 276 int error, jsys, len, oss_version; 277 278 /* Check that the parameters are correct. */ 279 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 280 if (error != ENOENT) { 281 if (error != 0) 282 return (error); 283 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT) 284 return (EINVAL); 285 } 286 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 287 if (error != ENOENT) { 288 if (error != 0) 289 return (error); 290 if (len == 0 || osname[len - 1] != '\0') 291 return (EINVAL); 292 if (len > LINUX_MAX_UTSNAME) { 293 vfs_opterror(opts, "linux.osname too long"); 294 return (ENAMETOOLONG); 295 } 296 } 297 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 298 if (error != ENOENT) { 299 if (error != 0) 300 return (error); 301 if (len == 0 || osrelease[len - 1] != '\0') 302 return (EINVAL); 303 if (len > LINUX_MAX_UTSNAME) { 304 vfs_opterror(opts, "linux.osrelease too long"); 305 return (ENAMETOOLONG); 306 } 307 error = linux_map_osrel(osrelease, NULL); 308 if (error != 0) { 309 vfs_opterror(opts, "linux.osrelease format error"); 310 return (error); 311 } 312 } 313 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 314 sizeof(oss_version)); 315 316 if (error == ENOENT) 317 error = 0; 318 return (error); 319 } 320 321 static int 322 linux_prison_set(void *obj, void *data) 323 { 324 struct linux_prison *lpr; 325 struct prison *pr = obj; 326 struct vfsoptlist *opts = data; 327 char *osname, *osrelease; 328 int error, gotversion, jsys, len, oss_version; 329 330 /* Set the parameters, which should be correct. */ 331 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 332 if (error == ENOENT) 333 jsys = -1; 334 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 335 if (error == ENOENT) 336 osname = NULL; 337 else 338 jsys = JAIL_SYS_NEW; 339 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 340 if (error == ENOENT) 341 osrelease = NULL; 342 else 343 jsys = JAIL_SYS_NEW; 344 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 345 sizeof(oss_version)); 346 if (error == ENOENT) 347 gotversion = 0; 348 else { 349 gotversion = 1; 350 jsys = JAIL_SYS_NEW; 351 } 352 switch (jsys) { 353 case JAIL_SYS_INHERIT: 354 /* "linux=inherit": inherit the parent's Linux info. */ 355 mtx_lock(&pr->pr_mtx); 356 osd_jail_del(pr, linux_osd_jail_slot); 357 mtx_unlock(&pr->pr_mtx); 358 break; 359 case JAIL_SYS_NEW: 360 /* 361 * "linux=new" or "linux.*": 362 * the prison gets its own Linux info. 363 */ 364 linux_alloc_prison(pr, &lpr); 365 if (osrelease) { 366 (void)linux_map_osrel(osrelease, &lpr->pr_osrel); 367 strlcpy(lpr->pr_osrelease, osrelease, 368 LINUX_MAX_UTSNAME); 369 } 370 if (osname) 371 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 372 if (gotversion) 373 lpr->pr_oss_version = oss_version; 374 mtx_unlock(&pr->pr_mtx); 375 } 376 377 return (0); 378 } 379 380 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters"); 381 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME, 382 "Jail Linux kernel OS name"); 383 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME, 384 "Jail Linux kernel OS release"); 385 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW, 386 "I", "Jail Linux OSS version"); 387 388 static int 389 linux_prison_get(void *obj, void *data) 390 { 391 struct linux_prison *lpr; 392 struct prison *ppr; 393 struct prison *pr = obj; 394 struct vfsoptlist *opts = data; 395 int error, i; 396 397 static int version0; 398 399 /* See if this prison is the one with the Linux info. */ 400 lpr = linux_find_prison(pr, &ppr); 401 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 402 error = vfs_setopt(opts, "linux", &i, sizeof(i)); 403 if (error != 0 && error != ENOENT) 404 goto done; 405 if (i) { 406 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname); 407 if (error != 0 && error != ENOENT) 408 goto done; 409 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease); 410 if (error != 0 && error != ENOENT) 411 goto done; 412 error = vfs_setopt(opts, "linux.oss_version", 413 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version)); 414 if (error != 0 && error != ENOENT) 415 goto done; 416 } else { 417 /* 418 * If this prison is inheriting its Linux info, report 419 * empty/zero parameters. 420 */ 421 error = vfs_setopts(opts, "linux.osname", ""); 422 if (error != 0 && error != ENOENT) 423 goto done; 424 error = vfs_setopts(opts, "linux.osrelease", ""); 425 if (error != 0 && error != ENOENT) 426 goto done; 427 error = vfs_setopt(opts, "linux.oss_version", &version0, 428 sizeof(lpr->pr_oss_version)); 429 if (error != 0 && error != ENOENT) 430 goto done; 431 } 432 error = 0; 433 434 done: 435 mtx_unlock(&ppr->pr_mtx); 436 437 return (error); 438 } 439 440 static void 441 linux_prison_destructor(void *data) 442 { 443 444 free(data, M_PRISON); 445 } 446 447 void 448 linux_osd_jail_register(void) 449 { 450 struct prison *pr; 451 osd_method_t methods[PR_MAXMETHOD] = { 452 [PR_METHOD_CREATE] = linux_prison_create, 453 [PR_METHOD_GET] = linux_prison_get, 454 [PR_METHOD_SET] = linux_prison_set, 455 [PR_METHOD_CHECK] = linux_prison_check 456 }; 457 458 linux_osd_jail_slot = 459 osd_jail_register(linux_prison_destructor, methods); 460 /* Copy the system Linux info to any current prisons. */ 461 sx_slock(&allprison_lock); 462 TAILQ_FOREACH(pr, &allprison, pr_list) 463 linux_alloc_prison(pr, NULL); 464 sx_sunlock(&allprison_lock); 465 } 466 467 void 468 linux_osd_jail_deregister(void) 469 { 470 471 osd_jail_deregister(linux_osd_jail_slot); 472 } 473 474 void 475 linux_get_osname(struct thread *td, char *dst) 476 { 477 struct prison *pr; 478 struct linux_prison *lpr; 479 480 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 481 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME); 482 mtx_unlock(&pr->pr_mtx); 483 } 484 485 static int 486 linux_set_osname(struct thread *td, char *osname) 487 { 488 struct prison *pr; 489 struct linux_prison *lpr; 490 491 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 492 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 493 mtx_unlock(&pr->pr_mtx); 494 495 return (0); 496 } 497 498 void 499 linux_get_osrelease(struct thread *td, char *dst) 500 { 501 struct prison *pr; 502 struct linux_prison *lpr; 503 504 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 505 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME); 506 mtx_unlock(&pr->pr_mtx); 507 } 508 509 int 510 linux_kernver(struct thread *td) 511 { 512 struct prison *pr; 513 struct linux_prison *lpr; 514 int osrel; 515 516 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 517 osrel = lpr->pr_osrel; 518 mtx_unlock(&pr->pr_mtx); 519 520 return (osrel); 521 } 522 523 static int 524 linux_set_osrelease(struct thread *td, char *osrelease) 525 { 526 struct prison *pr; 527 struct linux_prison *lpr; 528 int error; 529 530 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 531 error = linux_map_osrel(osrelease, &lpr->pr_osrel); 532 if (error == 0) 533 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME); 534 mtx_unlock(&pr->pr_mtx); 535 536 return (error); 537 } 538 539 int 540 linux_get_oss_version(struct thread *td) 541 { 542 struct prison *pr; 543 struct linux_prison *lpr; 544 int version; 545 546 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 547 version = lpr->pr_oss_version; 548 mtx_unlock(&pr->pr_mtx); 549 550 return (version); 551 } 552 553 static int 554 linux_set_oss_version(struct thread *td, int oss_version) 555 { 556 struct prison *pr; 557 struct linux_prison *lpr; 558 559 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 560 lpr->pr_oss_version = oss_version; 561 mtx_unlock(&pr->pr_mtx); 562 563 return (0); 564 }
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