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_posix.h"
43 #include <sys/param.h>
44 #include <sys/kernel.h>
45 #include <sys/systm.h>
46 #include <sys/sysctl.h>
49 #include <sys/mutex.h>
52 #include <sys/unistd.h>
54 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
55 "Sysctl internal magic");
56 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
57 "High kernel, proc, limits &c");
58 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
60 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
62 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
63 "Network, (see socket.h)");
64 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
66 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
67 "Sizeof various things");
68 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
70 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
72 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
74 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
75 "p1003_1b, (see p1003_1b.h)");
77 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
78 "Compatibility code");
79 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
82 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
83 "Regression test MIB");
86 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
87 kern_ident, 0, "Kernel identifier");
89 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
90 osrelease, 0, "Operating system release");
92 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
93 0, BSD, "Operating system revision");
95 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
96 version, 0, "Kernel version");
98 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
99 ostype, 0, "Operating system type");
102 * NOTICE: The *userland* release date is available in
103 * /usr/include/osreldate.h
105 extern int osreldate;
106 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
107 &osreldate, 0, "Kernel release date");
109 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
110 &maxproc, 0, "Maximum number of processes");
112 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
113 &maxprocperuid, 0, "Maximum processes allowed per userid");
115 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
116 &maxusers, 0, "Hint for kernel tuning");
118 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
119 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
121 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
122 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
124 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
125 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
127 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
128 0, 1, "Whether job control is available");
130 #ifdef _POSIX_SAVED_IDS
131 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
132 0, 1, "Whether saved set-group/user ID is available");
134 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
135 0, 0, "Whether saved set-group/user ID is available");
138 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
140 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
141 kernelname, sizeof kernelname, "Name of kernel file booted");
144 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
145 &mp_ncpus, 0, "Number of active CPUs");
147 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
148 0, 1, "Number of active CPUs");
151 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
152 0, BYTE_ORDER, "System byte order");
154 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
155 0, PAGE_SIZE, "System memory page size");
158 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
163 return (sysctl_handle_long(oidp, &val, 0, req));
166 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
167 0, 0, sysctl_hw_physmem, "LU", "");
170 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
174 return (sysctl_handle_long(oidp, &val, 0, req));
176 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
177 0, 0, sysctl_hw_realmem, "LU", "");
179 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
183 val = ctob(physmem - cnt.v_wire_count);
184 return (sysctl_handle_long(oidp, &val, 0, req));
187 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
188 0, 0, sysctl_hw_usermem, "LU", "");
190 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
192 static char machine_arch[] = MACHINE_ARCH;
193 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
194 machine_arch, 0, "System architecture");
196 char hostname[MAXHOSTNAMELEN];
199 sysctl_hostname(SYSCTL_HANDLER_ARGS)
202 char tmphostname[MAXHOSTNAMELEN];
205 pr = req->td->td_ucred->cr_prison;
207 if (!jail_set_hostname_allowed && req->newptr)
210 * Process is in jail, so make a local copy of jail
211 * hostname to get/set so we don't have to hold the jail
212 * mutex during the sysctl copyin/copyout activities.
214 mtx_lock(&pr->pr_mtx);
215 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
216 mtx_unlock(&pr->pr_mtx);
218 error = sysctl_handle_string(oidp, tmphostname,
219 sizeof pr->pr_host, req);
221 if (req->newptr != NULL && error == 0) {
223 * Copy the locally set hostname to the jail, if
226 mtx_lock(&pr->pr_mtx);
227 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
228 mtx_unlock(&pr->pr_mtx);
231 error = sysctl_handle_string(oidp,
232 hostname, sizeof hostname, req);
236 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
237 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
238 0, 0, sysctl_hostname, "A", "Hostname");
240 static int regression_securelevel_nonmonotonic = 0;
243 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
244 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
247 int securelevel = -1;
248 static struct mtx securelevel_mtx;
250 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
254 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
259 pr = req->td->td_ucred->cr_prison;
262 * If the process is in jail, return the maximum of the global and
263 * local levels; otherwise, return the global level. Perform a
264 * lockless read since the securelevel is an integer.
267 level = imax(securelevel, pr->pr_securelevel);
270 error = sysctl_handle_int(oidp, &level, 0, req);
271 if (error || !req->newptr)
274 * Permit update only if the new securelevel exceeds the
275 * global level, and local level if any.
278 mtx_lock(&pr->pr_mtx);
279 if (!regression_securelevel_nonmonotonic &&
280 (level < imax(securelevel, pr->pr_securelevel))) {
281 mtx_unlock(&pr->pr_mtx);
284 pr->pr_securelevel = level;
285 mtx_unlock(&pr->pr_mtx);
287 mtx_lock(&securelevel_mtx);
288 if (!regression_securelevel_nonmonotonic &&
289 (level < securelevel)) {
290 mtx_unlock(&securelevel_mtx);
294 mtx_unlock(&securelevel_mtx);
299 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
300 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
301 "I", "Current secure level");
303 char domainname[MAXHOSTNAMELEN];
304 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
305 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
308 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
311 * This is really cheating. These actually live in the libc, something
312 * which I'm not quite sure is a good idea anyway, but in order for
313 * getnext and friends to actually work, we define dummies here.
315 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
316 "", 0, "PATH that finds all the standard utilities");
317 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
318 0, 0, "Max ibase/obase values in bc(1)");
319 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
320 0, 0, "Max array size in bc(1)");
321 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
322 0, 0, "Max scale value in bc(1)");
323 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
324 0, 0, "Max string length in bc(1)");
325 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
326 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
327 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
328 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
329 0, 0, "Max length (bytes) of a text-processing utility's input line");
330 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
331 0, 0, "Maximum number of repeats of a regexp permitted");
332 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
334 "The version of POSIX 1003.2 with which the system attempts to comply");
335 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
336 0, 0, "Whether C development supports the C bindings option");
337 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
338 0, 0, "Whether system supports the C development utilities option");
339 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
341 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
342 0, 0, "Whether system supports FORTRAN development utilities");
343 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
344 0, 0, "Whether system supports FORTRAN runtime utilities");
345 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
346 0, 0, "Whether system supports creation of locales");
347 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
348 0, 0, "Whether system supports software development utilities");
349 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
350 0, 0, "Whether system supports the user portability utilities");
351 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
352 0, 0, "Min Maximum number of streams a process may have open at one time");
353 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
354 0, 0, "Min Maximum number of types supported for timezone names");
356 #include <sys/vnode.h>
357 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
358 0, sizeof(struct vnode), "sizeof(struct vnode)");
360 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
361 0, sizeof(struct proc), "sizeof(struct proc)");
363 #include <sys/conf.h>
364 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
365 0, sizeof(struct cdev), "sizeof(struct cdev)");
369 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
370 0, sizeof(struct bio), "sizeof(struct bio)");
371 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
372 0, sizeof(struct buf), "sizeof(struct buf)");
374 #include <sys/user.h>
375 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
376 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
378 /* XXX compatibility, remove for 6.0 */
379 #include <sys/imgact.h>
380 #include <sys/imgact_elf.h>
381 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
382 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
383 "compatibility for kern.fallback_elf_brand");