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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
40 * $FreeBSD: releng/5.0/sys/kern/kern_mib.c 106605 2002-11-07 23:57:17Z tmm $
41 */
42
43 #include "opt_posix.h"
44
45 #include <sys/param.h>
46 #include <sys/kernel.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, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
89 osrelease, 0, "Operating system release");
90
91 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
92 0, BSD, "Operating system revision");
93
94 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
95 version, 0, "Kernel version");
96
97 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
98 ostype, 0, "Operating system type");
99
100 extern int osreldate;
101 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
102 &osreldate, 0, "Operating system release date");
103
104 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD,
105 &maxproc, 0, "Maximum number of processes");
106
107 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
108 &maxprocperuid, 0, "Maximum processes allowed per userid");
109
110 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD,
111 &maxusers, 0, "Hint for kernel tuning");
112
113 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
114 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
115
116 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
117 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
118
119 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
120 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
121
122 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
123 0, 1, "Whether job control is available");
124
125 #ifdef _POSIX_SAVED_IDS
126 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
127 0, 1, "Whether saved set-group/user ID is available");
128 #else
129 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
130 0, 0, "Whether saved set-group/user ID is available");
131 #endif
132
133 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
134
135 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
136 kernelname, sizeof kernelname, "Name of kernel file booted");
137
138 #ifdef SMP
139 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
140 &mp_ncpus, 0, "Number of active CPUs");
141 #else
142 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
143 0, 1, "Number of active CPUs");
144 #endif
145
146 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
147 0, BYTE_ORDER, "System byte order");
148
149 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
150 0, PAGE_SIZE, "System memory page size");
151
152 static int
153 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
154 {
155 u_long val;
156
157 val = ctob(physmem);
158 return (sysctl_handle_long(oidp, &val, 0, req));
159 }
160
161 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
162 0, 0, sysctl_hw_physmem, "LU", "");
163
164 static int
165 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
166 {
167 u_long val;
168
169 val = ctob(physmem - cnt.v_wire_count);
170 return (sysctl_handle_long(oidp, &val, 0, req));
171 }
172
173 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
174 0, 0, sysctl_hw_usermem, "LU", "");
175
176 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
177
178 static char machine_arch[] = MACHINE_ARCH;
179 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
180 machine_arch, 0, "System architecture");
181
182 char hostname[MAXHOSTNAMELEN];
183
184 static int
185 sysctl_hostname(SYSCTL_HANDLER_ARGS)
186 {
187 struct prison *pr;
188 char tmphostname[MAXHOSTNAMELEN];
189 int error;
190
191 pr = req->td->td_ucred->cr_prison;
192 if (pr != NULL) {
193 if (!jail_set_hostname_allowed && req->newptr)
194 return (EPERM);
195 /*
196 * Process is in jail, so make a local copy of jail
197 * hostname to get/set so we don't have to hold the jail
198 * mutex during the sysctl copyin/copyout activities.
199 */
200 mtx_lock(&pr->pr_mtx);
201 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
202 mtx_unlock(&pr->pr_mtx);
203
204 error = sysctl_handle_string(oidp, tmphostname,
205 sizeof pr->pr_host, req);
206
207 if (req->newptr != NULL && error == 0) {
208 /*
209 * Copy the locally set hostname to the jail, if
210 * appropriate.
211 */
212 mtx_lock(&pr->pr_mtx);
213 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
214 mtx_unlock(&pr->pr_mtx);
215 }
216 } else
217 error = sysctl_handle_string(oidp,
218 hostname, sizeof hostname, req);
219 return (error);
220 }
221
222 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
223 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
224 0, 0, sysctl_hostname, "A", "Hostname");
225
226 static int regression_securelevel_nonmonotonic = 0;
227
228 #ifdef REGRESSION
229 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
230 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
231 #endif
232
233 int securelevel = -1;
234 struct mtx securelevel_mtx;
235
236 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
237 MTX_DEF);
238
239 static int
240 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
241 {
242 struct prison *pr;
243 int error, level;
244
245 pr = req->td->td_ucred->cr_prison;
246
247 /*
248 * If the process is in jail, return the maximum of the global and
249 * local levels; otherwise, return the global level.
250 */
251 if (pr != NULL) {
252 mtx_lock(&pr->pr_mtx);
253 level = imax(securelevel, pr->pr_securelevel);
254 mtx_unlock(&pr->pr_mtx);
255 } else
256 level = securelevel;
257 error = sysctl_handle_int(oidp, &level, 0, req);
258 if (error || !req->newptr)
259 return (error);
260 /*
261 * Permit update only if the new securelevel exceeds the
262 * global level, and local level if any.
263 */
264 if (pr != NULL) {
265 mtx_lock(&pr->pr_mtx);
266 if (!regression_securelevel_nonmonotonic &&
267 (level < imax(securelevel, pr->pr_securelevel))) {
268 mtx_unlock(&pr->pr_mtx);
269 return (EPERM);
270 }
271 pr->pr_securelevel = level;
272 mtx_unlock(&pr->pr_mtx);
273 } else {
274 mtx_lock(&securelevel_mtx);
275 if (!regression_securelevel_nonmonotonic &&
276 (level < securelevel)) {
277 mtx_unlock(&securelevel_mtx);
278 return (EPERM);
279 }
280 securelevel = level;
281 mtx_unlock(&securelevel_mtx);
282 }
283 return (error);
284 }
285
286 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
287 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
288 "I", "Current secure level");
289
290 char domainname[MAXHOSTNAMELEN];
291 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
292 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
293
294 u_long hostid;
295 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
296
297 /*
298 * This is really cheating. These actually live in the libc, something
299 * which I'm not quite sure is a good idea anyway, but in order for
300 * getnext and friends to actually work, we define dummies here.
301 */
302 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
303 "", 0, "PATH that finds all the standard utilities");
304 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
305 0, 0, "Max ibase/obase values in bc(1)");
306 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
307 0, 0, "Max array size in bc(1)");
308 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
309 0, 0, "Max scale value in bc(1)");
310 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
311 0, 0, "Max string length in bc(1)");
312 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
313 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
314 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
315 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
316 0, 0, "Max length (bytes) of a text-processing utility's input line");
317 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
318 0, 0, "Maximum number of repeats of a regexp permitted");
319 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
320 0, 0,
321 "The version of POSIX 1003.2 with which the system attempts to comply");
322 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
323 0, 0, "Whether C development supports the C bindings option");
324 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
325 0, 0, "Whether system supports the C development utilities option");
326 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
327 0, 0, "");
328 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
329 0, 0, "Whether system supports FORTRAN development utilities");
330 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
331 0, 0, "Whether system supports FORTRAN runtime utilities");
332 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
333 0, 0, "Whether system supports creation of locales");
334 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
335 0, 0, "Whether system supports software development utilities");
336 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
337 0, 0, "Whether system supports the user portability utilities");
338 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
339 0, 0, "Min Maximum number of streams a process may have open at one time");
340 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
341 0, 0, "Min Maximum number of types supported for timezone names");
342
343 #include <sys/vnode.h>
344 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
345 0, sizeof(struct vnode), "sizeof(struct vnode)");
346
347 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
348 0, sizeof(struct proc), "sizeof(struct proc)");
349
350 #include <sys/conf.h>
351 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
352 0, sizeof(struct cdev), "sizeof(struct cdev)");
353
354 #include <sys/bio.h>
355 #include <sys/buf.h>
356 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
357 0, sizeof(struct bio), "sizeof(struct bio)");
358 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
359 0, sizeof(struct buf), "sizeof(struct buf)");
360
361 #include <sys/user.h>
362 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
363 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
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