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, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE,
103 ostype, 0, "Operating system type");
106 * NOTICE: The *userland* release date is available in
107 * /usr/include/osreldate.h
109 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
110 &osreldate, 0, "Kernel release date");
112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
113 &maxproc, 0, "Maximum number of processes");
115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
116 &maxprocperuid, 0, "Maximum processes allowed per userid");
118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
119 &maxusers, 0, "Hint for kernel tuning");
121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
122 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
125 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
127 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RDTUN,
129 "Maximum number of supplemental groups a user can belong to");
131 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
132 0, 1, "Whether job control is available");
134 #ifdef _POSIX_SAVED_IDS
135 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
136 0, 1, "Whether saved set-group/user ID is available");
138 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
139 0, 0, "Whether saved set-group/user ID is available");
142 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
144 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
145 kernelname, sizeof kernelname, "Name of kernel file booted");
147 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
148 &mp_ncpus, 0, "Number of active CPUs");
150 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
151 0, BYTE_ORDER, "System byte order");
153 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
154 0, PAGE_SIZE, "System memory page size");
157 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
163 if (len > sizeof(buf))
165 arc4rand(buf, len, 0);
166 return (SYSCTL_OUT(req, buf, len));
169 SYSCTL_PROC(_kern, KERN_ARND, arandom,
170 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
171 sysctl_kern_arnd, "", "arc4rand");
174 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
179 return (sysctl_handle_long(oidp, &val, 0, req));
182 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
183 0, 0, sysctl_hw_physmem, "LU", "");
186 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
190 return (sysctl_handle_long(oidp, &val, 0, req));
192 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
193 0, 0, sysctl_hw_realmem, "LU", "");
195 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
199 val = ctob(physmem - cnt.v_wire_count);
200 return (sysctl_handle_long(oidp, &val, 0, req));
203 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
204 0, 0, sysctl_hw_usermem, "LU", "");
206 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
208 u_long pagesizes[MAXPAGESIZES] = { PAGE_SIZE };
211 sysctl_hw_pagesizes(SYSCTL_HANDLER_ARGS)
216 uint32_t pagesizes32[MAXPAGESIZES];
218 if (req->flags & SCTL_MASK32) {
220 * Recreate the "pagesizes" array with 32-bit elements. Truncate
221 * any page size greater than UINT32_MAX to zero.
223 for (i = 0; i < MAXPAGESIZES; i++)
224 pagesizes32[i] = (uint32_t)pagesizes[i];
226 error = SYSCTL_OUT(req, pagesizes32, sizeof(pagesizes32));
229 error = SYSCTL_OUT(req, pagesizes, sizeof(pagesizes));
232 SYSCTL_PROC(_hw, OID_AUTO, pagesizes, CTLTYPE_ULONG | CTLFLAG_RD,
233 NULL, 0, sysctl_hw_pagesizes, "LU", "Supported page sizes");
236 int adaptive_machine_arch = 1;
237 SYSCTL_INT(_debug, OID_AUTO, adaptive_machine_arch, CTLFLAG_RW,
238 &adaptive_machine_arch, 1,
239 "Adapt reported machine architecture to the ABI of the binary");
243 sysctl_hw_machine_arch(SYSCTL_HANDLER_ARGS)
246 static const char machine_arch[] = MACHINE_ARCH;
248 static const char machine_arch32[] = MACHINE_ARCH32;
250 if ((req->flags & SCTL_MASK32) != 0 && adaptive_machine_arch)
251 error = SYSCTL_OUT(req, machine_arch32, sizeof(machine_arch32));
254 error = SYSCTL_OUT(req, machine_arch, sizeof(machine_arch));
258 SYSCTL_PROC(_hw, HW_MACHINE_ARCH, machine_arch, CTLTYPE_STRING | CTLFLAG_RD,
259 NULL, 0, sysctl_hw_machine_arch, "A", "System architecture");
262 sysctl_hostname(SYSCTL_HANDLER_ARGS)
264 struct prison *pr, *cpr;
266 char tmpname[MAXHOSTNAMELEN];
267 int descend, error, len;
270 * This function can set: hostname domainname hostuuid.
271 * Keep that in mind when comments say "hostname".
273 pr_offset = (size_t)arg1;
275 KASSERT(len <= sizeof(tmpname),
276 ("length %d too long for %s", len, __func__));
278 pr = req->td->td_ucred->cr_prison;
279 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
282 * Make a local copy of hostname to get/set so we don't have to hold
283 * the jail mutex during the sysctl copyin/copyout activities.
285 mtx_lock(&pr->pr_mtx);
286 bcopy((char *)pr + pr_offset, tmpname, len);
287 mtx_unlock(&pr->pr_mtx);
289 error = sysctl_handle_string(oidp, tmpname, len, req);
291 if (req->newptr != NULL && error == 0) {
293 * Copy the locally set hostname to all jails that share
296 sx_slock(&allprison_lock);
297 while (!(pr->pr_flags & PR_HOST))
299 mtx_lock(&pr->pr_mtx);
300 bcopy(tmpname, (char *)pr + pr_offset, len);
301 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
302 if (cpr->pr_flags & PR_HOST)
305 bcopy(tmpname, (char *)cpr + pr_offset, len);
306 mtx_unlock(&pr->pr_mtx);
307 sx_sunlock(&allprison_lock);
312 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
313 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
314 (void *)(offsetof(struct prison, pr_hostname)), MAXHOSTNAMELEN,
315 sysctl_hostname, "A", "Hostname");
316 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname,
317 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
318 (void *)(offsetof(struct prison, pr_domainname)), MAXHOSTNAMELEN,
319 sysctl_hostname, "A", "Name of the current YP/NIS domain");
320 SYSCTL_PROC(_kern, KERN_HOSTUUID, hostuuid,
321 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
322 (void *)(offsetof(struct prison, pr_hostuuid)), HOSTUUIDLEN,
323 sysctl_hostname, "A", "Host UUID");
325 static int regression_securelevel_nonmonotonic = 0;
328 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
329 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
333 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
335 struct prison *pr, *cpr;
336 int descend, error, level;
338 pr = req->td->td_ucred->cr_prison;
341 * Reading the securelevel is easy, since the current jail's level
342 * is known to be at least as secure as any higher levels. Perform
343 * a lockless read since the securelevel is an integer.
345 level = pr->pr_securelevel;
346 error = sysctl_handle_int(oidp, &level, 0, req);
347 if (error || !req->newptr)
349 /* Permit update only if the new securelevel exceeds the old. */
350 sx_slock(&allprison_lock);
351 mtx_lock(&pr->pr_mtx);
352 if (!regression_securelevel_nonmonotonic &&
353 level < pr->pr_securelevel) {
354 mtx_unlock(&pr->pr_mtx);
355 sx_sunlock(&allprison_lock);
358 pr->pr_securelevel = level;
360 * Set all child jails to be at least this level, but do not lower
361 * them (even if regression_securelevel_nonmonotonic).
363 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) {
364 if (cpr->pr_securelevel < level)
365 cpr->pr_securelevel = level;
367 mtx_unlock(&pr->pr_mtx);
368 sx_sunlock(&allprison_lock);
372 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
373 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
374 "I", "Current secure level");
376 #ifdef INCLUDE_CONFIG_FILE
377 /* Actual kernel configuration options. */
378 extern char kernconfstring[];
381 sysctl_kern_config(SYSCTL_HANDLER_ARGS)
383 return (sysctl_handle_string(oidp, kernconfstring,
384 strlen(kernconfstring), req));
387 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
388 0, 0, sysctl_kern_config, "", "Kernel configuration file");
392 sysctl_hostid(SYSCTL_HANDLER_ARGS)
394 struct prison *pr, *cpr;
399 * Like sysctl_hostname, except it operates on a u_long
400 * instead of a string, and is used only for hostid.
402 pr = req->td->td_ucred->cr_prison;
403 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr)
405 tmpid = pr->pr_hostid;
406 error = sysctl_handle_long(oidp, &tmpid, 0, req);
408 if (req->newptr != NULL && error == 0) {
409 sx_slock(&allprison_lock);
410 while (!(pr->pr_flags & PR_HOST))
412 mtx_lock(&pr->pr_mtx);
413 pr->pr_hostid = tmpid;
414 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend)
415 if (cpr->pr_flags & PR_HOST)
418 cpr->pr_hostid = tmpid;
419 mtx_unlock(&pr->pr_mtx);
420 sx_sunlock(&allprison_lock);
425 SYSCTL_PROC(_kern, KERN_HOSTID, hostid,
426 CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
427 NULL, 0, sysctl_hostid, "LU", "Host ID");
429 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
431 #ifdef COMPAT_FREEBSD4
432 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
435 #ifdef COMPAT_FREEBSD5
436 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
439 #ifdef COMPAT_FREEBSD6
440 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
443 #ifdef COMPAT_FREEBSD7
444 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
448 * This is really cheating. These actually live in the libc, something
449 * which I'm not quite sure is a good idea anyway, but in order for
450 * getnext and friends to actually work, we define dummies here.
452 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
453 "", 0, "PATH that finds all the standard utilities");
454 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
455 0, 0, "Max ibase/obase values in bc(1)");
456 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
457 0, 0, "Max array size in bc(1)");
458 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
459 0, 0, "Max scale value in bc(1)");
460 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
461 0, 0, "Max string length in bc(1)");
462 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
463 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
464 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
465 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
466 0, 0, "Max length (bytes) of a text-processing utility's input line");
467 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
468 0, 0, "Maximum number of repeats of a regexp permitted");
469 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
471 "The version of POSIX 1003.2 with which the system attempts to comply");
472 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
473 0, 0, "Whether C development supports the C bindings option");
474 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
475 0, 0, "Whether system supports the C development utilities option");
476 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
478 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
479 0, 0, "Whether system supports FORTRAN development utilities");
480 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
481 0, 0, "Whether system supports FORTRAN runtime utilities");
482 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
483 0, 0, "Whether system supports creation of locales");
484 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
485 0, 0, "Whether system supports software development utilities");
486 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
487 0, 0, "Whether system supports the user portability utilities");
488 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
489 0, 0, "Min Maximum number of streams a process may have open at one time");
490 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
491 0, 0, "Min Maximum number of types supported for timezone names");
493 #include <sys/vnode.h>
494 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
495 0, sizeof(struct vnode), "sizeof(struct vnode)");
497 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
498 0, sizeof(struct proc), "sizeof(struct proc)");
502 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
503 0, sizeof(struct bio), "sizeof(struct bio)");
504 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
505 0, sizeof(struct buf), "sizeof(struct buf)");
507 #include <sys/user.h>
508 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
509 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
511 /* XXX compatibility, remove for 6.0 */
512 #include <sys/imgact.h>
513 #include <sys/imgact_elf.h>
514 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
515 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
516 "compatibility for kern.fallback_elf_brand");