Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mib.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 9 * project, to make these variables more userfriendly. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/7.3/sys/kern/kern_mib.c 198742 2009-11-01 08:45:44Z alc $"); 40 41 #include "opt_compat.h" 42 #include "opt_posix.h" 43 #include "opt_config.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/sbuf.h> 48 #include <sys/systm.h> 49 #include <sys/sysctl.h> 50 #include <sys/proc.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/jail.h> 54 #include <sys/smp.h> 55 #include <sys/unistd.h> 56 57 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 58 "Sysctl internal magic"); 59 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 60 "High kernel, proc, limits &c"); 61 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 62 "Virtual memory"); 63 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 64 "File system"); 65 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 66 "Network, (see socket.h)"); 67 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 68 "Debugging"); 69 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 70 "Sizeof various things"); 71 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 72 "hardware"); 73 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 74 "machine dependent"); 75 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 76 "user-level"); 77 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 78 "p1003_1b, (see p1003_1b.h)"); 79 80 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 81 "Compatibility code"); 82 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 83 "Security"); 84 #ifdef REGRESSION 85 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 86 "Regression test MIB"); 87 #endif 88 89 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 90 kern_ident, 0, "Kernel identifier"); 91 92 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE, 93 osrelease, 0, "Operating system release"); 94 95 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 96 0, BSD, "Operating system revision"); 97 98 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 99 version, 0, "Kernel version"); 100 101 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE, 102 ostype, 0, "Operating system type"); 103 104 /* 105 * NOTICE: The *userland* release date is available in 106 * /usr/include/osreldate.h 107 */ 108 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 109 &osreldate, 0, "Kernel release date"); 110 111 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN, 112 &maxproc, 0, "Maximum number of processes"); 113 114 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 115 &maxprocperuid, 0, "Maximum processes allowed per userid"); 116 117 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN, 118 &maxusers, 0, "Hint for kernel tuning"); 119 120 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 121 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 122 123 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 124 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 125 126 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 127 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 128 129 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 130 0, 1, "Whether job control is available"); 131 132 #ifdef _POSIX_SAVED_IDS 133 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 134 0, 1, "Whether saved set-group/user ID is available"); 135 #else 136 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 137 0, 0, "Whether saved set-group/user ID is available"); 138 #endif 139 140 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 141 142 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 143 kernelname, sizeof kernelname, "Name of kernel file booted"); 144 145 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 146 &mp_ncpus, 0, "Number of active CPUs"); 147 148 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 149 0, BYTE_ORDER, "System byte order"); 150 151 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 152 0, PAGE_SIZE, "System memory page size"); 153 154 static int 155 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 156 { 157 char buf[256]; 158 size_t len; 159 160 len = req->oldlen; 161 if (len > sizeof(buf)) 162 len = sizeof(buf); 163 arc4rand(buf, len, 0); 164 return (SYSCTL_OUT(req, buf, len)); 165 } 166 167 SYSCTL_PROC(_kern, KERN_ARND, arandom, 168 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 169 sysctl_kern_arnd, "", "arc4rand"); 170 171 static int 172 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 173 { 174 u_long val; 175 176 val = ctob(physmem); 177 return (sysctl_handle_long(oidp, &val, 0, req)); 178 } 179 180 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 181 0, 0, sysctl_hw_physmem, "LU", ""); 182 183 static int 184 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 185 { 186 u_long val; 187 val = ctob(realmem); 188 return (sysctl_handle_long(oidp, &val, 0, req)); 189 } 190 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 191 0, 0, sysctl_hw_realmem, "LU", ""); 192 static int 193 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 194 { 195 u_long val; 196 197 val = ctob(physmem - cnt.v_wire_count); 198 return (sysctl_handle_long(oidp, &val, 0, req)); 199 } 200 201 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 202 0, 0, sysctl_hw_usermem, "LU", ""); 203 204 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 205 206 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE }; 207 208 static int 209 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS) 210 { 211 int error; 212 #ifdef SCTL_MASK32 213 int i; 214 uint32_t pagesizes32[MAXPAGESIZES]; 215 216 if (req->flags & SCTL_MASK32) { 217 /* 218 * Recreate the "pagesizes" array with 32-bit elements. Truncate 219 * any page size greater than UINT32_MAX to zero. 220 */ 221 for (i = 0; i < MAXPAGESIZES; i++) 222 pagesizes32[i] = (uint32_t)pagesizes[i]; 223 224 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32)); 225 } else 226 #endif 227 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes)); 228 return (error); 229 } 230 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD, 231 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes"); 232 233 static char machine_arch[] = MACHINE_ARCH; 234 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 235 machine_arch, 0, "System architecture"); 236 237 char hostname[MAXHOSTNAMELEN]; 238 239 static int 240 sysctl_hostname(SYSCTL_HANDLER_ARGS) 241 { 242 struct prison *pr; 243 char tmphostname[MAXHOSTNAMELEN]; 244 int error; 245 246 pr = req->td->td_ucred->cr_prison; 247 if (pr != NULL) { 248 if (!jail_set_hostname_allowed && req->newptr) 249 return (EPERM); 250 /* 251 * Process is in jail, so make a local copy of jail 252 * hostname to get/set so we don't have to hold the jail 253 * mutex during the sysctl copyin/copyout activities. 254 */ 255 mtx_lock(&pr->pr_mtx); 256 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 257 mtx_unlock(&pr->pr_mtx); 258 259 error = sysctl_handle_string(oidp, tmphostname, 260 sizeof pr->pr_host, req); 261 262 if (req->newptr != NULL && error == 0) { 263 /* 264 * Copy the locally set hostname to the jail, if 265 * appropriate. 266 */ 267 mtx_lock(&pr->pr_mtx); 268 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 269 mtx_unlock(&pr->pr_mtx); 270 } 271 } else 272 error = sysctl_handle_string(oidp, 273 hostname, sizeof hostname, req); 274 return (error); 275 } 276 277 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 278 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON|CTLFLAG_MPSAFE, 279 0, 0, sysctl_hostname, "A", "Hostname"); 280 281 static int regression_securelevel_nonmonotonic = 0; 282 283 #ifdef REGRESSION 284 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 285 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 286 #endif 287 288 int securelevel = -1; 289 static struct mtx securelevel_mtx; 290 291 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 292 MTX_DEF); 293 294 static int 295 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 296 { 297 struct prison *pr; 298 int error, level; 299 300 pr = req->td->td_ucred->cr_prison; 301 302 /* 303 * If the process is in jail, return the maximum of the global and 304 * local levels; otherwise, return the global level. Perform a 305 * lockless read since the securelevel is an integer. 306 */ 307 if (pr != NULL) 308 level = imax(securelevel, pr->pr_securelevel); 309 else 310 level = securelevel; 311 error = sysctl_handle_int(oidp, &level, 0, req); 312 if (error || !req->newptr) 313 return (error); 314 /* 315 * Permit update only if the new securelevel exceeds the 316 * global level, and local level if any. 317 */ 318 if (pr != NULL) { 319 mtx_lock(&pr->pr_mtx); 320 if (!regression_securelevel_nonmonotonic && 321 (level < imax(securelevel, pr->pr_securelevel))) { 322 mtx_unlock(&pr->pr_mtx); 323 return (EPERM); 324 } 325 pr->pr_securelevel = level; 326 mtx_unlock(&pr->pr_mtx); 327 } else { 328 mtx_lock(&securelevel_mtx); 329 if (!regression_securelevel_nonmonotonic && 330 (level < securelevel)) { 331 mtx_unlock(&securelevel_mtx); 332 return (EPERM); 333 } 334 securelevel = level; 335 mtx_unlock(&securelevel_mtx); 336 } 337 return (error); 338 } 339 340 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 341 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 342 "I", "Current secure level"); 343 344 #ifdef INCLUDE_CONFIG_FILE 345 /* Actual kernel configuration options. */ 346 extern char kernconfstring[]; 347 348 static int 349 sysctl_kern_config(SYSCTL_HANDLER_ARGS) 350 { 351 return (sysctl_handle_string(oidp, kernconfstring, 352 strlen(kernconfstring), req)); 353 } 354 355 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW, 356 0, 0, sysctl_kern_config, "", "Kernel configuration file"); 357 #endif 358 359 char domainname[MAXHOSTNAMELEN]; 360 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 361 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 362 363 u_long hostid; 364 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 365 char hostuuid[64] = "00000000-0000-0000-0000-000000000000"; 366 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid, 367 sizeof(hostuuid), "Host UUID"); 368 369 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 370 371 #ifdef COMPAT_FREEBSD4 372 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 373 #endif 374 375 #ifdef COMPAT_FREEBSD5 376 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 377 #endif 378 379 #ifdef COMPAT_FREEBSD6 380 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 381 #endif 382 383 /* 384 * This is really cheating. These actually live in the libc, something 385 * which I'm not quite sure is a good idea anyway, but in order for 386 * getnext and friends to actually work, we define dummies here. 387 */ 388 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 389 "", 0, "PATH that finds all the standard utilities"); 390 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 391 0, 0, "Max ibase/obase values in bc(1)"); 392 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 393 0, 0, "Max array size in bc(1)"); 394 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 395 0, 0, "Max scale value in bc(1)"); 396 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 397 0, 0, "Max string length in bc(1)"); 398 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 399 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 400 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 401 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 402 0, 0, "Max length (bytes) of a text-processing utility's input line"); 403 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 404 0, 0, "Maximum number of repeats of a regexp permitted"); 405 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 406 0, 0, 407 "The version of POSIX 1003.2 with which the system attempts to comply"); 408 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 409 0, 0, "Whether C development supports the C bindings option"); 410 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 411 0, 0, "Whether system supports the C development utilities option"); 412 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 413 0, 0, ""); 414 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 415 0, 0, "Whether system supports FORTRAN development utilities"); 416 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 417 0, 0, "Whether system supports FORTRAN runtime utilities"); 418 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 419 0, 0, "Whether system supports creation of locales"); 420 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 421 0, 0, "Whether system supports software development utilities"); 422 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 423 0, 0, "Whether system supports the user portability utilities"); 424 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 425 0, 0, "Min Maximum number of streams a process may have open at one time"); 426 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 427 0, 0, "Min Maximum number of types supported for timezone names"); 428 429 #include <sys/vnode.h> 430 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 431 0, sizeof(struct vnode), "sizeof(struct vnode)"); 432 433 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 434 0, sizeof(struct proc), "sizeof(struct proc)"); 435 436 #include <sys/bio.h> 437 #include <sys/buf.h> 438 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 439 0, sizeof(struct bio), "sizeof(struct bio)"); 440 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 441 0, sizeof(struct buf), "sizeof(struct buf)"); 442 443 #include <sys/user.h> 444 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 445 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 446 447 /* XXX compatibility, remove for 6.0 */ 448 #include <sys/imgact.h> 449 #include <sys/imgact_elf.h> 450 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 451 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 452 "compatibility for kern.fallback_elf_brand");
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