FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mib.c
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: src/sys/kern/kern_mib.c,v 1.90 2008/08/17 23:27:27 bz Exp $");
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 #include <sys/vimage.h>
57
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,
63 "Virtual memory");
64 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
65 "File system");
66 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
67 "Network, (see socket.h)");
68 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
69 "Debugging");
70 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
71 "Sizeof various things");
72 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
73 "hardware");
74 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
75 "machine dependent");
76 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
77 "user-level");
78 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
79 "p1003_1b, (see p1003_1b.h)");
80
81 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
82 "Compatibility code");
83 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
84 "Security");
85 #ifdef REGRESSION
86 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
87 "Regression test MIB");
88 #endif
89
90 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
91 kern_ident, 0, "Kernel identifier");
92
93 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
94 osrelease, 0, "Operating system release");
95
96 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
97 0, BSD, "Operating system revision");
98
99 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
100 version, 0, "Kernel version");
101
102 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
103 ostype, 0, "Operating system type");
104
105 /*
106 * NOTICE: The *userland* release date is available in
107 * /usr/include/osreldate.h
108 */
109 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
110 &osreldate, 0, "Kernel release date");
111
112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
113 &maxproc, 0, "Maximum number of processes");
114
115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
116 &maxprocperuid, 0, "Maximum processes allowed per userid");
117
118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
119 &maxusers, 0, "Hint for kernel tuning");
120
121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
122 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
123
124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
125 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
126
127 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
128 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
129
130 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
131 0, 1, "Whether job control is available");
132
133 #ifdef _POSIX_SAVED_IDS
134 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
135 0, 1, "Whether saved set-group/user ID is available");
136 #else
137 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
138 0, 0, "Whether saved set-group/user ID is available");
139 #endif
140
141 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
142
143 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
144 kernelname, sizeof kernelname, "Name of kernel file booted");
145
146 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
147 &mp_ncpus, 0, "Number of active CPUs");
148
149 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
150 0, BYTE_ORDER, "System byte order");
151
152 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
153 0, PAGE_SIZE, "System memory page size");
154
155 static int
156 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
157 {
158 char buf[256];
159 size_t len;
160
161 len = req->oldlen;
162 if (len > sizeof(buf))
163 len = sizeof(buf);
164 arc4rand(buf, len, 0);
165 return (SYSCTL_OUT(req, buf, len));
166 }
167
168 SYSCTL_PROC(_kern, KERN_ARND, arandom, CTLTYPE_OPAQUE | CTLFLAG_RD,
169 NULL, 0, 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 static char machine_arch[] = MACHINE_ARCH;
207 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
208 machine_arch, 0, "System architecture");
209
210 char hostname[MAXHOSTNAMELEN];
211
212 /*
213 * This mutex is used to protect the hostname and domainname variables, and
214 * perhaps in the future should also protect hostid, hostuid, and others.
215 */
216 struct mtx hostname_mtx;
217 MTX_SYSINIT(hostname_mtx, &hostname_mtx, "hostname", MTX_DEF);
218
219 static int
220 sysctl_hostname(SYSCTL_HANDLER_ARGS)
221 {
222 struct prison *pr;
223 char tmphostname[MAXHOSTNAMELEN];
224 int error;
225
226 pr = req->td->td_ucred->cr_prison;
227 if (pr != NULL) {
228 if (!jail_set_hostname_allowed && req->newptr)
229 return (EPERM);
230 /*
231 * Process is in jail, so make a local copy of jail
232 * hostname to get/set so we don't have to hold the jail
233 * mutex during the sysctl copyin/copyout activities.
234 */
235 mtx_lock(&pr->pr_mtx);
236 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
237 mtx_unlock(&pr->pr_mtx);
238
239 error = sysctl_handle_string(oidp, tmphostname,
240 sizeof pr->pr_host, req);
241
242 if (req->newptr != NULL && error == 0) {
243 /*
244 * Copy the locally set hostname to the jail, if
245 * appropriate.
246 */
247 mtx_lock(&pr->pr_mtx);
248 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
249 mtx_unlock(&pr->pr_mtx);
250 }
251 } else {
252 mtx_lock(&hostname_mtx);
253 bcopy(V_hostname, tmphostname, MAXHOSTNAMELEN);
254 mtx_unlock(&hostname_mtx);
255 error = sysctl_handle_string(oidp, tmphostname,
256 sizeof tmphostname, req);
257 if (req->newptr != NULL && error == 0) {
258 mtx_lock(&hostname_mtx);
259 bcopy(tmphostname, V_hostname, MAXHOSTNAMELEN);
260 mtx_unlock(&hostname_mtx);
261 }
262 }
263 return (error);
264 }
265
266 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
267 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
268 0, 0, sysctl_hostname, "A", "Hostname");
269
270 static int regression_securelevel_nonmonotonic = 0;
271
272 #ifdef REGRESSION
273 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
274 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
275 #endif
276
277 int securelevel = -1;
278 static struct mtx securelevel_mtx;
279
280 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
281 MTX_DEF);
282
283 static int
284 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
285 {
286 struct prison *pr;
287 int error, level;
288
289 pr = req->td->td_ucred->cr_prison;
290
291 /*
292 * If the process is in jail, return the maximum of the global and
293 * local levels; otherwise, return the global level. Perform a
294 * lockless read since the securelevel is an integer.
295 */
296 if (pr != NULL)
297 level = imax(securelevel, pr->pr_securelevel);
298 else
299 level = securelevel;
300 error = sysctl_handle_int(oidp, &level, 0, req);
301 if (error || !req->newptr)
302 return (error);
303 /*
304 * Permit update only if the new securelevel exceeds the
305 * global level, and local level if any.
306 */
307 if (pr != NULL) {
308 mtx_lock(&pr->pr_mtx);
309 if (!regression_securelevel_nonmonotonic &&
310 (level < imax(securelevel, pr->pr_securelevel))) {
311 mtx_unlock(&pr->pr_mtx);
312 return (EPERM);
313 }
314 pr->pr_securelevel = level;
315 mtx_unlock(&pr->pr_mtx);
316 } else {
317 mtx_lock(&securelevel_mtx);
318 if (!regression_securelevel_nonmonotonic &&
319 (level < securelevel)) {
320 mtx_unlock(&securelevel_mtx);
321 return (EPERM);
322 }
323 securelevel = level;
324 mtx_unlock(&securelevel_mtx);
325 }
326 return (error);
327 }
328
329 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
330 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
331 "I", "Current secure level");
332
333 #ifdef INCLUDE_CONFIG_FILE
334 /* Actual kernel configuration options. */
335 extern char kernconfstring[];
336
337 static int
338 sysctl_kern_config(SYSCTL_HANDLER_ARGS)
339 {
340 return (sysctl_handle_string(oidp, kernconfstring,
341 strlen(kernconfstring), req));
342 }
343
344 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
345 0, 0, sysctl_kern_config, "", "Kernel configuration file");
346 #endif
347
348 char domainname[MAXHOSTNAMELEN]; /* Protected by hostname_mtx. */
349
350 static int
351 sysctl_domainname(SYSCTL_HANDLER_ARGS)
352 {
353 char tmpdomainname[MAXHOSTNAMELEN];
354 int error;
355
356 mtx_lock(&hostname_mtx);
357 bcopy(domainname, tmpdomainname, MAXHOSTNAMELEN);
358 mtx_unlock(&hostname_mtx);
359 error = sysctl_handle_string(oidp, tmpdomainname,
360 sizeof tmpdomainname, req);
361 if (req->newptr != NULL && error == 0) {
362 mtx_lock(&hostname_mtx);
363 bcopy(tmpdomainname, domainname, MAXHOSTNAMELEN);
364 mtx_unlock(&hostname_mtx);
365 }
366 return (error);
367 }
368
369 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, CTLTYPE_STRING|CTLFLAG_RW,
370 0, 0, sysctl_domainname, "A", "NAme of the current YP/NIS domain");
371
372 u_long hostid;
373 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
374 char hostuuid[64] = "00000000-0000-0000-0000-000000000000";
375 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid,
376 sizeof(hostuuid), "Host UUID");
377
378 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
379
380 #ifdef COMPAT_FREEBSD4
381 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
382 #endif
383
384 #ifdef COMPAT_FREEBSD5
385 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
386 #endif
387
388 #ifdef COMPAT_FREEBSD6
389 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
390 #endif
391
392 #ifdef COMPAT_FREEBSD7
393 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
394 #endif
395
396 /*
397 * This is really cheating. These actually live in the libc, something
398 * which I'm not quite sure is a good idea anyway, but in order for
399 * getnext and friends to actually work, we define dummies here.
400 */
401 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
402 "", 0, "PATH that finds all the standard utilities");
403 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
404 0, 0, "Max ibase/obase values in bc(1)");
405 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
406 0, 0, "Max array size in bc(1)");
407 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
408 0, 0, "Max scale value in bc(1)");
409 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
410 0, 0, "Max string length in bc(1)");
411 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
412 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
413 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
414 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
415 0, 0, "Max length (bytes) of a text-processing utility's input line");
416 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
417 0, 0, "Maximum number of repeats of a regexp permitted");
418 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
419 0, 0,
420 "The version of POSIX 1003.2 with which the system attempts to comply");
421 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
422 0, 0, "Whether C development supports the C bindings option");
423 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
424 0, 0, "Whether system supports the C development utilities option");
425 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
426 0, 0, "");
427 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
428 0, 0, "Whether system supports FORTRAN development utilities");
429 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
430 0, 0, "Whether system supports FORTRAN runtime utilities");
431 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
432 0, 0, "Whether system supports creation of locales");
433 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
434 0, 0, "Whether system supports software development utilities");
435 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
436 0, 0, "Whether system supports the user portability utilities");
437 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
438 0, 0, "Min Maximum number of streams a process may have open at one time");
439 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
440 0, 0, "Min Maximum number of types supported for timezone names");
441
442 #include <sys/vnode.h>
443 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
444 0, sizeof(struct vnode), "sizeof(struct vnode)");
445
446 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
447 0, sizeof(struct proc), "sizeof(struct proc)");
448
449 #include <sys/bio.h>
450 #include <sys/buf.h>
451 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
452 0, sizeof(struct bio), "sizeof(struct bio)");
453 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
454 0, sizeof(struct buf), "sizeof(struct buf)");
455
456 #include <sys/user.h>
457 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
458 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
459
460 /* XXX compatibility, remove for 6.0 */
461 #include <sys/imgact.h>
462 #include <sys/imgact_elf.h>
463 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
464 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
465 "compatibility for kern.fallback_elf_brand");
466
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