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("$FreeBSD$");
40
41 #include "opt_posix.h"
42 #include "opt_config.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/sbuf.h>
47 #include <sys/systm.h>
48 #include <sys/sysctl.h>
49 #include <sys/proc.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/jail.h>
53 #include <sys/smp.h>
54 #include <sys/unistd.h>
55
56 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
57 "Sysctl internal magic");
58 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
59 "High kernel, proc, limits &c");
60 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
61 "Virtual memory");
62 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
63 "File system");
64 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
65 "Network, (see socket.h)");
66 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
67 "Debugging");
68 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
69 "Sizeof various things");
70 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
71 "hardware");
72 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
73 "machine dependent");
74 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
75 "user-level");
76 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
77 "p1003_1b, (see p1003_1b.h)");
78
79 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
80 "Compatibility code");
81 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
82 "Security");
83 #ifdef REGRESSION
84 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
85 "Regression test MIB");
86 #endif
87
88 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
89 kern_ident, 0, "Kernel identifier");
90
91 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
92 osrelease, 0, "Operating system release");
93
94 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
95 0, BSD, "Operating system revision");
96
97 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
98 version, 0, "Kernel version");
99
100 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
101 ostype, 0, "Operating system type");
102
103 /*
104 * NOTICE: The *userland* release date is available in
105 * /usr/include/osreldate.h
106 */
107 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
108 &osreldate, 0, "Kernel release date");
109
110 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
111 &maxproc, 0, "Maximum number of processes");
112
113 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
114 &maxprocperuid, 0, "Maximum processes allowed per userid");
115
116 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
117 &maxusers, 0, "Hint for kernel tuning");
118
119 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
120 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
121
122 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
123 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
124
125 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
126 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
127
128 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
129 0, 1, "Whether job control is available");
130
131 #ifdef _POSIX_SAVED_IDS
132 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
133 0, 1, "Whether saved set-group/user ID is available");
134 #else
135 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
136 0, 0, "Whether saved set-group/user ID is available");
137 #endif
138
139 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
140
141 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
142 kernelname, sizeof kernelname, "Name of kernel file booted");
143
144 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
145 &mp_ncpus, 0, "Number of active CPUs");
146
147 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
148 0, BYTE_ORDER, "System byte order");
149
150 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
151 0, PAGE_SIZE, "System memory page size");
152
153 static int
154 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
155 {
156 u_long val;
157
158 arc4rand(&val, sizeof(val), 0);
159 return (sysctl_handle_long(oidp, &val, 0, req));
160 }
161
162 SYSCTL_PROC(_kern, KERN_ARND, arandom, CTLFLAG_RD,
163 0, 0, sysctl_kern_arnd, "L", "arc4rand");
164
165 static int
166 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
167 {
168 u_long val;
169
170 val = ctob(physmem);
171 return (sysctl_handle_long(oidp, &val, 0, req));
172 }
173
174 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
175 0, 0, sysctl_hw_physmem, "LU", "");
176
177 static int
178 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
179 {
180 u_long val;
181 val = ctob(realmem);
182 return (sysctl_handle_long(oidp, &val, 0, req));
183 }
184 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
185 0, 0, sysctl_hw_realmem, "LU", "");
186 static int
187 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
188 {
189 u_long val;
190
191 val = ctob(physmem - cnt.v_wire_count);
192 return (sysctl_handle_long(oidp, &val, 0, req));
193 }
194
195 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
196 0, 0, sysctl_hw_usermem, "LU", "");
197
198 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
199
200 static char machine_arch[] = MACHINE_ARCH;
201 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
202 machine_arch, 0, "System architecture");
203
204 char hostname[MAXHOSTNAMELEN];
205
206 static int
207 sysctl_hostname(SYSCTL_HANDLER_ARGS)
208 {
209 struct prison *pr;
210 char tmphostname[MAXHOSTNAMELEN];
211 int error;
212
213 pr = req->td->td_ucred->cr_prison;
214 if (pr != NULL) {
215 if (!jail_set_hostname_allowed && req->newptr)
216 return (EPERM);
217 /*
218 * Process is in jail, so make a local copy of jail
219 * hostname to get/set so we don't have to hold the jail
220 * mutex during the sysctl copyin/copyout activities.
221 */
222 mtx_lock(&pr->pr_mtx);
223 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
224 mtx_unlock(&pr->pr_mtx);
225
226 error = sysctl_handle_string(oidp, tmphostname,
227 sizeof pr->pr_host, req);
228
229 if (req->newptr != NULL && error == 0) {
230 /*
231 * Copy the locally set hostname to the jail, if
232 * appropriate.
233 */
234 mtx_lock(&pr->pr_mtx);
235 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
236 mtx_unlock(&pr->pr_mtx);
237 }
238 } else
239 error = sysctl_handle_string(oidp,
240 hostname, sizeof hostname, req);
241 return (error);
242 }
243
244 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
245 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
246 0, 0, sysctl_hostname, "A", "Hostname");
247
248 static int regression_securelevel_nonmonotonic = 0;
249
250 #ifdef REGRESSION
251 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
252 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
253 #endif
254
255 int securelevel = -1;
256 static struct mtx securelevel_mtx;
257
258 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
259 MTX_DEF);
260
261 static int
262 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
263 {
264 struct prison *pr;
265 int error, level;
266
267 pr = req->td->td_ucred->cr_prison;
268
269 /*
270 * If the process is in jail, return the maximum of the global and
271 * local levels; otherwise, return the global level. Perform a
272 * lockless read since the securelevel is an integer.
273 */
274 if (pr != NULL)
275 level = imax(securelevel, pr->pr_securelevel);
276 else
277 level = securelevel;
278 error = sysctl_handle_int(oidp, &level, 0, req);
279 if (error || !req->newptr)
280 return (error);
281 /*
282 * Permit update only if the new securelevel exceeds the
283 * global level, and local level if any.
284 */
285 if (pr != NULL) {
286 mtx_lock(&pr->pr_mtx);
287 if (!regression_securelevel_nonmonotonic &&
288 (level < imax(securelevel, pr->pr_securelevel))) {
289 mtx_unlock(&pr->pr_mtx);
290 return (EPERM);
291 }
292 pr->pr_securelevel = level;
293 mtx_unlock(&pr->pr_mtx);
294 } else {
295 mtx_lock(&securelevel_mtx);
296 if (!regression_securelevel_nonmonotonic &&
297 (level < securelevel)) {
298 mtx_unlock(&securelevel_mtx);
299 return (EPERM);
300 }
301 securelevel = level;
302 mtx_unlock(&securelevel_mtx);
303 }
304 return (error);
305 }
306
307 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
308 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
309 "I", "Current secure level");
310
311 #ifdef INCLUDE_CONFIG_FILE
312 /* Actual kernel configuration options. */
313 extern char kernconfstring[];
314
315 static int
316 sysctl_kern_config(SYSCTL_HANDLER_ARGS)
317 {
318 return (sysctl_handle_string(oidp, kernconfstring,
319 strlen(kernconfstring), req));
320 }
321
322 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
323 0, 0, sysctl_kern_config, "", "Kernel configuration file");
324 #endif
325
326 char domainname[MAXHOSTNAMELEN];
327 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
328 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
329
330 u_long hostid;
331 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
332 char hostuuid[64] = "00000000-0000-0000-0000-000000000000";
333 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid,
334 sizeof(hostuuid), "Host UUID");
335
336 /*
337 * This is really cheating. These actually live in the libc, something
338 * which I'm not quite sure is a good idea anyway, but in order for
339 * getnext and friends to actually work, we define dummies here.
340 */
341 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
342 "", 0, "PATH that finds all the standard utilities");
343 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
344 0, 0, "Max ibase/obase values in bc(1)");
345 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
346 0, 0, "Max array size in bc(1)");
347 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
348 0, 0, "Max scale value in bc(1)");
349 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
350 0, 0, "Max string length in bc(1)");
351 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
352 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
353 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
354 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
355 0, 0, "Max length (bytes) of a text-processing utility's input line");
356 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
357 0, 0, "Maximum number of repeats of a regexp permitted");
358 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
359 0, 0,
360 "The version of POSIX 1003.2 with which the system attempts to comply");
361 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
362 0, 0, "Whether C development supports the C bindings option");
363 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
364 0, 0, "Whether system supports the C development utilities option");
365 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
366 0, 0, "");
367 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
368 0, 0, "Whether system supports FORTRAN development utilities");
369 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
370 0, 0, "Whether system supports FORTRAN runtime utilities");
371 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
372 0, 0, "Whether system supports creation of locales");
373 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
374 0, 0, "Whether system supports software development utilities");
375 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
376 0, 0, "Whether system supports the user portability utilities");
377 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
378 0, 0, "Min Maximum number of streams a process may have open at one time");
379 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
380 0, 0, "Min Maximum number of types supported for timezone names");
381
382 #include <sys/vnode.h>
383 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
384 0, sizeof(struct vnode), "sizeof(struct vnode)");
385
386 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
387 0, sizeof(struct proc), "sizeof(struct proc)");
388
389 #include <sys/bio.h>
390 #include <sys/buf.h>
391 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
392 0, sizeof(struct bio), "sizeof(struct bio)");
393 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
394 0, sizeof(struct buf), "sizeof(struct buf)");
395
396 #include <sys/user.h>
397 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
398 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
399
400 /* XXX compatibility, remove for 6.0 */
401 #include <sys/imgact.h>
402 #include <sys/imgact_elf.h>
403 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
404 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
405 "compatibility for kern.fallback_elf_brand");
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