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>
55 #include <sys/unistd.h>
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,
63 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
65 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
66 "Network, (see socket.h)");
67 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
69 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
70 "Sizeof various things");
71 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
73 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
75 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
77 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
78 "p1003_1b, (see p1003_1b.h)");
80 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
81 "Compatibility code");
82 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
85 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
86 "Regression test MIB");
89 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE,
90 kern_ident, 0, "Kernel identifier");
92 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE,
93 osrelease, 0, "Operating system release");
95 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
96 0, BSD, "Operating system revision");
98 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE,
99 version, 0, "Kernel version");
101 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE,
102 ostype, 0, "Operating system type");
105 * NOTICE: The *userland* release date is available in
106 * /usr/include/osreldate.h
108 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
109 &osreldate, 0, "Kernel release date");
111 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
112 &maxproc, 0, "Maximum number of processes");
114 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
115 &maxprocperuid, 0, "Maximum processes allowed per userid");
117 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
118 &maxusers, 0, "Hint for kernel tuning");
120 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
121 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
123 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
124 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
126 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
127 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
129 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
130 0, 1, "Whether job control is available");
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");
136 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
137 0, 0, "Whether saved set-group/user ID is available");
140 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
142 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
143 kernelname, sizeof kernelname, "Name of kernel file booted");
145 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
146 &mp_ncpus, 0, "Number of active CPUs");
148 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
149 0, BYTE_ORDER, "System byte order");
151 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
152 0, PAGE_SIZE, "System memory page size");
155 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
161 if (len > sizeof(buf))
163 arc4rand(buf, len, 0);
164 return (SYSCTL_OUT(req, buf, len));
167 SYSCTL_PROC(_kern, KERN_ARND, arandom,
168 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
169 sysctl_kern_arnd, "", "arc4rand");
172 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
177 return (sysctl_handle_long(oidp, &val, 0, req));
180 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
181 0, 0, sysctl_hw_physmem, "LU", "");
184 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
188 return (sysctl_handle_long(oidp, &val, 0, req));
190 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
191 0, 0, sysctl_hw_realmem, "LU", "");
193 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
197 val = ctob(physmem - cnt.v_wire_count);
198 return (sysctl_handle_long(oidp, &val, 0, req));
201 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
202 0, 0, sysctl_hw_usermem, "LU", "");
204 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
206 static char machine_arch[] = MACHINE_ARCH;
207 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
208 machine_arch, 0, "System architecture");
210 char hostname[MAXHOSTNAMELEN];
213 sysctl_hostname(SYSCTL_HANDLER_ARGS)
216 char tmphostname[MAXHOSTNAMELEN];
219 pr = req->td->td_ucred->cr_prison;
221 if (!jail_set_hostname_allowed && req->newptr)
224 * Process is in jail, so make a local copy of jail
225 * hostname to get/set so we don't have to hold the jail
226 * mutex during the sysctl copyin/copyout activities.
228 mtx_lock(&pr->pr_mtx);
229 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
230 mtx_unlock(&pr->pr_mtx);
232 error = sysctl_handle_string(oidp, tmphostname,
233 sizeof pr->pr_host, req);
235 if (req->newptr != NULL && error == 0) {
237 * Copy the locally set hostname to the jail, if
240 mtx_lock(&pr->pr_mtx);
241 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
242 mtx_unlock(&pr->pr_mtx);
245 error = sysctl_handle_string(oidp,
246 hostname, sizeof hostname, req);
250 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
251 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON|CTLFLAG_MPSAFE,
252 0, 0, sysctl_hostname, "A", "Hostname");
254 static int regression_securelevel_nonmonotonic = 0;
257 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
258 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
261 int securelevel = -1;
262 static struct mtx securelevel_mtx;
264 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
268 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
273 pr = req->td->td_ucred->cr_prison;
276 * If the process is in jail, return the maximum of the global and
277 * local levels; otherwise, return the global level. Perform a
278 * lockless read since the securelevel is an integer.
281 level = imax(securelevel, pr->pr_securelevel);
284 error = sysctl_handle_int(oidp, &level, 0, req);
285 if (error || !req->newptr)
288 * Permit update only if the new securelevel exceeds the
289 * global level, and local level if any.
292 mtx_lock(&pr->pr_mtx);
293 if (!regression_securelevel_nonmonotonic &&
294 (level < imax(securelevel, pr->pr_securelevel))) {
295 mtx_unlock(&pr->pr_mtx);
298 pr->pr_securelevel = level;
299 mtx_unlock(&pr->pr_mtx);
301 mtx_lock(&securelevel_mtx);
302 if (!regression_securelevel_nonmonotonic &&
303 (level < securelevel)) {
304 mtx_unlock(&securelevel_mtx);
308 mtx_unlock(&securelevel_mtx);
313 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
314 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
315 "I", "Current secure level");
317 #ifdef INCLUDE_CONFIG_FILE
318 /* Actual kernel configuration options. */
319 extern char kernconfstring[];
322 sysctl_kern_config(SYSCTL_HANDLER_ARGS)
324 return (sysctl_handle_string(oidp, kernconfstring,
325 strlen(kernconfstring), req));
328 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
329 0, 0, sysctl_kern_config, "", "Kernel configuration file");
332 char domainname[MAXHOSTNAMELEN];
333 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
334 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
337 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
338 char hostuuid[64] = "00000000-0000-0000-0000-000000000000";
339 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid,
340 sizeof(hostuuid), "Host UUID");
342 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
344 #ifdef COMPAT_FREEBSD4
345 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
348 #ifdef COMPAT_FREEBSD5
349 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
352 #ifdef COMPAT_FREEBSD6
353 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
357 * This is really cheating. These actually live in the libc, something
358 * which I'm not quite sure is a good idea anyway, but in order for
359 * getnext and friends to actually work, we define dummies here.
361 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
362 "", 0, "PATH that finds all the standard utilities");
363 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
364 0, 0, "Max ibase/obase values in bc(1)");
365 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
366 0, 0, "Max array size in bc(1)");
367 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
368 0, 0, "Max scale value in bc(1)");
369 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
370 0, 0, "Max string length in bc(1)");
371 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
372 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
373 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
374 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
375 0, 0, "Max length (bytes) of a text-processing utility's input line");
376 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
377 0, 0, "Maximum number of repeats of a regexp permitted");
378 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
380 "The version of POSIX 1003.2 with which the system attempts to comply");
381 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
382 0, 0, "Whether C development supports the C bindings option");
383 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
384 0, 0, "Whether system supports the C development utilities option");
385 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
387 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
388 0, 0, "Whether system supports FORTRAN development utilities");
389 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
390 0, 0, "Whether system supports FORTRAN runtime utilities");
391 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
392 0, 0, "Whether system supports creation of locales");
393 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
394 0, 0, "Whether system supports software development utilities");
395 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
396 0, 0, "Whether system supports the user portability utilities");
397 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
398 0, 0, "Min Maximum number of streams a process may have open at one time");
399 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
400 0, 0, "Min Maximum number of types supported for timezone names");
402 #include <sys/vnode.h>
403 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
404 0, sizeof(struct vnode), "sizeof(struct vnode)");
406 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
407 0, sizeof(struct proc), "sizeof(struct proc)");
411 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
412 0, sizeof(struct bio), "sizeof(struct bio)");
413 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
414 0, sizeof(struct buf), "sizeof(struct buf)");
416 #include <sys/user.h>
417 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
418 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
420 /* XXX compatibility, remove for 6.0 */
421 #include <sys/imgact.h>
422 #include <sys/imgact_elf.h>
423 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
424 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
425 "compatibility for kern.fallback_elf_brand");