2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Mike Karels at Berkeley Software Design, Inc.
8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
9 * project, to make these variables more userfriendly.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
35 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "opt_compat.h"
42 #include "opt_posix.h"
43 #include "opt_config.h"
45 #include <sys/param.h>
46 #include <sys/kernel.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
52 #include <sys/mutex.h>
56 #include <sys/unistd.h>
58 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
59 "Sysctl internal magic");
60 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
61 "High kernel, proc, limits &c");
62 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
64 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
66 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
67 "Network, (see socket.h)");
68 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
70 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
71 "Sizeof various things");
72 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
74 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
76 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
78 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
79 "p1003_1b, (see p1003_1b.h)");
81 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
82 "Compatibility code");
83 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
86 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
87 "Regression test MIB");
90 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE,
91 kern_ident, 0, "Kernel identifier");
93 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE,
94 osrelease, 0, "Operating system release");
96 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
97 0, BSD, "Operating system revision");
99 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
100 version, 0, "Kernel version");
102 SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD|CTLFLAG_MPSAFE,
103 compiler_version, 0, "Version of compiler used to compile kernel");
105 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE,
106 ostype, 0, "Operating system type");
109 * NOTICE: The *userland* release date is available in
110 * /usr/include/osreldate.h
112 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
113 &osreldate, 0, "Kernel release date");
115 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
116 &maxproc, 0, "Maximum number of processes");
118 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
119 &maxprocperuid, 0, "Maximum processes allowed per userid");
121 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
122 &maxusers, 0, "Hint for kernel tuning");
124 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
125 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
127 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
128 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
130 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN,
132 "Maximum number of supplemental groups a user can belong to");
134 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
135 0, 1, "Whether job control is available");
137 #ifdef _POSIX_SAVED_IDS
138 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
139 0, 1, "Whether saved set-group/user ID is available");
141 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
142 0, 0, "Whether saved set-group/user ID is available");
145 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
147 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
148 kernelname, sizeof kernelname, "Name of kernel file booted");
150 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
151 &mp_ncpus, 0, "Number of active CPUs");
153 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
154 0, BYTE_ORDER, "System byte order");
156 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
157 0, PAGE_SIZE, "System memory page size");
160 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
166 if (len > sizeof(buf))
168 arc4rand(buf, len, 0);
169 return (SYSCTL_OUT(req, buf, len));
172 SYSCTL_PROC(_kern, KERN_ARND, arandom,
173 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
174 sysctl_kern_arnd, "", "arc4rand");
177 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
182 return (sysctl_handle_long(oidp, &val, 0, req));
185 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
186 0, 0, sysctl_hw_physmem, "LU", "");
189 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
193 return (sysctl_handle_long(oidp, &val, 0, req));
195 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
196 0, 0, sysctl_hw_realmem, "LU", "");
198 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
202 val = ctob(physmem - cnt.v_wire_count);
203 return (sysctl_handle_long(oidp, &val, 0, req));
206 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
207 0, 0, sysctl_hw_usermem, "LU", "");
209 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
211 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
214 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
219 uint32_t pagesizes32[MAXPAGESIZES];
221 if (req->flags & SCTL_MASK32) {
223 * Recreate the "pagesizes" array with 32-bit elements. Truncate
224 * any page size greater than UINT32_MAX to zero.
226 for (i = 0; i < MAXPAGESIZES; i++)
227 pagesizes32[i] = (uint32_t)pagesizes[i];
229 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32));
232 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes));
235 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD,
236 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes");
239 int adaptive_machine_arch = 1;
240 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
241 &adaptive_machine_arch, 1,
242 "Adapt reported machine architecture to the ABI of the binary");
246 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
249 static const char machine_arch[] = MACHINE_ARCH;
251 static const char machine_arch32[] = MACHINE_ARCH32;
253 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch)
254 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32));
257 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch));
261 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD,
262 NULL, 0, sysctl_hw_machine_arch, "A", "System architecture");
264 SYSCTL_STRING(_kern, OID_AUTO, supported_archs, CTLFLAG_RD | CTLFLAG_MPSAFE,
265 #ifdef COMPAT_FREEBSD32
266 MACHINE_ARCH " " MACHINE_ARCH32, 0, "Supported architectures for binaries");
268 MACHINE_ARCH, 0, "Supported architectures for binaries");
272 sysctl_hostname(SYSCTL_HANDLER_ARGS)
274 struct prison *pr, *cpr;
276 char tmpname[MAXHOSTNAMELEN];
277 int descend, error, len;
280 * This function can set: hostname domainname hostuuid.
281 * Keep that in mind when comments say "hostname".
283 pr_offset = (size_t)arg1;
285 KASSERT(len <= sizeof(tmpname),
286 ("length %d too long for %s", len, __func__));
288 pr = req->td->td_ucred->cr_prison;
289 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
292 * Make a local copy of hostname to get/set so we don't have to hold
293 * the jail mutex during the sysctl copyin/copyout activities.
295 mtx_lock(&pr->pr_mtx);
296 bcopy((char *)pr + pr_offset, tmpname, len);
297 mtx_unlock(&pr->pr_mtx);
299 error = sysctl_handle_string(oidp, tmpname, len, req);
301 if (req->newptr != NULL && error == 0) {
303 * Copy the locally set hostname to all jails that share
306 sx_slock(&allprison_lock);
307 while (!(pr->pr_flags & PR_HOST))
309 mtx_lock(&pr->pr_mtx);
310 bcopy(tmpname, (char *)pr + pr_offset, len);
311 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
312 if (cpr->pr_flags & PR_HOST)
315 bcopy(tmpname, (char *)cpr + pr_offset, len);
316 mtx_unlock(&pr->pr_mtx);
317 sx_sunlock(&allprison_lock);
322 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
323 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
324 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
325 sysctl_hostname, "A", "Hostname");
326 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
327 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
328 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
329 sysctl_hostname, "A", "Name of the current YP/NIS domain");
330 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
331 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
332 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
333 sysctl_hostname, "A", "Host UUID");
335 static int regression_securelevel_nonmonotonic = 0;
338 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
339 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
343 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
345 struct prison *pr, *cpr;
346 int descend, error, level;
348 pr = req->td->td_ucred->cr_prison;
351 * Reading the securelevel is easy, since the current jail's level
352 * is known to be at least as secure as any higher levels. Perform
353 * a lockless read since the securelevel is an integer.
355 level = pr->pr_securelevel;
356 error = sysctl_handle_int(oidp, &level, 0, req);
357 if (error || !req->newptr)
359 /* Permit update only if the new securelevel exceeds the old. */
360 sx_slock(&allprison_lock);
361 mtx_lock(&pr->pr_mtx);
362 if (!regression_securelevel_nonmonotonic &&
363 level < pr->pr_securelevel) {
364 mtx_unlock(&pr->pr_mtx);
365 sx_sunlock(&allprison_lock);
368 pr->pr_securelevel = level;
370 * Set all child jails to be at least this level, but do not lower
371 * them (even if regression_securelevel_nonmonotonic).
373 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
374 if (cpr->pr_securelevel < level)
375 cpr->pr_securelevel = level;
377 mtx_unlock(&pr->pr_mtx);
378 sx_sunlock(&allprison_lock);
382 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
383 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
384 "I", "Current secure level");
386 #ifdef INCLUDE_CONFIG_FILE
387 /* Actual kernel configuration options. */
388 extern char kernconfstring[];
391 sysctl_kern_config(SYSCTL_HANDLER_ARGS)
393 return (sysctl_handle_string(oidp, kernconfstring,
394 strlen(kernconfstring), req));
397 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
398 0, 0, sysctl_kern_config, "", "Kernel configuration file");
402 sysctl_hostid(SYSCTL_HANDLER_ARGS)
404 struct prison *pr, *cpr;
409 * Like sysctl_hostname, except it operates on a u_long
410 * instead of a string, and is used only for hostid.
412 pr = req->td->td_ucred->cr_prison;
413 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
415 tmpid = pr->pr_hostid;
416 error = sysctl_handle_long(oidp, &tmpid, 0, req);
418 if (req->newptr != NULL && error == 0) {
419 sx_slock(&allprison_lock);
420 while (!(pr->pr_flags & PR_HOST))
422 mtx_lock(&pr->pr_mtx);
423 pr->pr_hostid = tmpid;
424 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
425 if (cpr->pr_flags & PR_HOST)
428 cpr->pr_hostid = tmpid;
429 mtx_unlock(&pr->pr_mtx);
430 sx_sunlock(&allprison_lock);
435 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
436 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
437 NULL, 0, sysctl_hostid, "LU", "Host ID");
439 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
441 #ifdef COMPAT_FREEBSD4
442 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
445 #ifdef COMPAT_FREEBSD5
446 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
449 #ifdef COMPAT_FREEBSD6
450 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
453 #ifdef COMPAT_FREEBSD7
454 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
458 * This is really cheating. These actually live in the libc, something
459 * which I'm not quite sure is a good idea anyway, but in order for
460 * getnext and friends to actually work, we define dummies here.
462 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
463 "", 0, "PATH that finds all the standard utilities");
464 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
465 0, 0, "Max ibase/obase values in bc(1)");
466 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
467 0, 0, "Max array size in bc(1)");
468 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
469 0, 0, "Max scale value in bc(1)");
470 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
471 0, 0, "Max string length in bc(1)");
472 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
473 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
474 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
475 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
476 0, 0, "Max length (bytes) of a text-processing utility's input line");
477 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
478 0, 0, "Maximum number of repeats of a regexp permitted");
479 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
481 "The version of POSIX 1003.2 with which the system attempts to comply");
482 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
483 0, 0, "Whether C development supports the C bindings option");
484 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
485 0, 0, "Whether system supports the C development utilities option");
486 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
488 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
489 0, 0, "Whether system supports FORTRAN development utilities");
490 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
491 0, 0, "Whether system supports FORTRAN runtime utilities");
492 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
493 0, 0, "Whether system supports creation of locales");
494 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
495 0, 0, "Whether system supports software development utilities");
496 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
497 0, 0, "Whether system supports the user portability utilities");
498 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
499 0, 0, "Min Maximum number of streams a process may have open at one time");
500 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
501 0, 0, "Min Maximum number of types supported for timezone names");
503 #include <sys/vnode.h>
504 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
505 0, sizeof(struct vnode), "sizeof(struct vnode)");
507 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
508 0, sizeof(struct proc), "sizeof(struct proc)");
512 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
513 0, sizeof(struct bio), "sizeof(struct bio)");
514 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
515 0, sizeof(struct buf), "sizeof(struct buf)");
517 #include <sys/user.h>
518 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
519 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
521 /* XXX compatibility, remove for 6.0 */
522 #include <sys/imgact.h>
523 #include <sys/imgact_elf.h>
524 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
525 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
526 "compatibility for kern.fallback_elf_brand");