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: releng/6.4/sys/kern/kern_mib.c 179984 2008-06-24 21:08:30Z jhb $");
40
41 #include "opt_compat.h"
42 #include "opt_posix.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/systm.h>
47 #include <sys/sysctl.h>
48 #include <sys/proc.h>
49 #include <sys/lock.h>
50 #include <sys/mutex.h>
51 #include <sys/jail.h>
52 #include <sys/smp.h>
53 #include <sys/unistd.h>
54
55 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
56 "Sysctl internal magic");
57 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
58 "High kernel, proc, limits &c");
59 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
60 "Virtual memory");
61 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
62 "File system");
63 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
64 "Network, (see socket.h)");
65 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
66 "Debugging");
67 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
68 "Sizeof various things");
69 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
70 "hardware");
71 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
72 "machine dependent");
73 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
74 "user-level");
75 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
76 "p1003_1b, (see p1003_1b.h)");
77
78 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
79 "Compatibility code");
80 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
81 "Security");
82 #ifdef REGRESSION
83 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
84 "Regression test MIB");
85 #endif
86
87 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
88 kern_ident, 0, "Kernel identifier");
89
90 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
91 osrelease, 0, "Operating system release");
92
93 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
94 0, BSD, "Operating system revision");
95
96 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
97 version, 0, "Kernel version");
98
99 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
100 ostype, 0, "Operating system type");
101
102 /*
103 * NOTICE: The *userland* release date is available in
104 * /usr/include/osreldate.h
105 */
106 extern int osreldate;
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_hw_physmem(SYSCTL_HANDLER_ARGS)
155 {
156 u_long val;
157
158 val = ctob(physmem);
159 return (sysctl_handle_long(oidp, &val, 0, req));
160 }
161
162 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
163 0, 0, sysctl_hw_physmem, "LU", "");
164
165 static int
166 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
167 {
168 u_long val;
169 val = ctob(realmem);
170 return (sysctl_handle_long(oidp, &val, 0, req));
171 }
172 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
173 0, 0, sysctl_hw_realmem, "LU", "");
174 static int
175 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
176 {
177 u_long val;
178
179 val = ctob(physmem - cnt.v_wire_count);
180 return (sysctl_handle_long(oidp, &val, 0, req));
181 }
182
183 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
184 0, 0, sysctl_hw_usermem, "LU", "");
185
186 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
187
188 static char machine_arch[] = MACHINE_ARCH;
189 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
190 machine_arch, 0, "System architecture");
191
192 char hostname[MAXHOSTNAMELEN];
193
194 static int
195 sysctl_hostname(SYSCTL_HANDLER_ARGS)
196 {
197 struct prison *pr;
198 char tmphostname[MAXHOSTNAMELEN];
199 int error;
200
201 pr = req->td->td_ucred->cr_prison;
202 if (pr != NULL) {
203 if (!jail_set_hostname_allowed && req->newptr)
204 return (EPERM);
205 /*
206 * Process is in jail, so make a local copy of jail
207 * hostname to get/set so we don't have to hold the jail
208 * mutex during the sysctl copyin/copyout activities.
209 */
210 mtx_lock(&pr->pr_mtx);
211 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
212 mtx_unlock(&pr->pr_mtx);
213
214 error = sysctl_handle_string(oidp, tmphostname,
215 sizeof pr->pr_host, req);
216
217 if (req->newptr != NULL && error == 0) {
218 /*
219 * Copy the locally set hostname to the jail, if
220 * appropriate.
221 */
222 mtx_lock(&pr->pr_mtx);
223 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
224 mtx_unlock(&pr->pr_mtx);
225 }
226 } else
227 error = sysctl_handle_string(oidp,
228 hostname, sizeof hostname, req);
229 return (error);
230 }
231
232 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
233 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
234 0, 0, sysctl_hostname, "A", "Hostname");
235
236 static int regression_securelevel_nonmonotonic = 0;
237
238 #ifdef REGRESSION
239 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
240 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
241 #endif
242
243 int securelevel = -1;
244 static struct mtx securelevel_mtx;
245
246 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
247 MTX_DEF);
248
249 static int
250 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
251 {
252 struct prison *pr;
253 int error, level;
254
255 pr = req->td->td_ucred->cr_prison;
256
257 /*
258 * If the process is in jail, return the maximum of the global and
259 * local levels; otherwise, return the global level. Perform a
260 * lockless read since the securelevel is an integer.
261 */
262 if (pr != NULL)
263 level = imax(securelevel, pr->pr_securelevel);
264 else
265 level = securelevel;
266 error = sysctl_handle_int(oidp, &level, 0, req);
267 if (error || !req->newptr)
268 return (error);
269 /*
270 * Permit update only if the new securelevel exceeds the
271 * global level, and local level if any.
272 */
273 if (pr != NULL) {
274 mtx_lock(&pr->pr_mtx);
275 if (!regression_securelevel_nonmonotonic &&
276 (level < imax(securelevel, pr->pr_securelevel))) {
277 mtx_unlock(&pr->pr_mtx);
278 return (EPERM);
279 }
280 pr->pr_securelevel = level;
281 mtx_unlock(&pr->pr_mtx);
282 } else {
283 mtx_lock(&securelevel_mtx);
284 if (!regression_securelevel_nonmonotonic &&
285 (level < securelevel)) {
286 mtx_unlock(&securelevel_mtx);
287 return (EPERM);
288 }
289 securelevel = level;
290 mtx_unlock(&securelevel_mtx);
291 }
292 return (error);
293 }
294
295 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
296 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
297 "I", "Current secure level");
298
299 char domainname[MAXHOSTNAMELEN];
300 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
301 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
302
303 u_long hostid;
304 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
305
306 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
307
308 #ifdef COMPAT_FREEBSD4
309 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
310 #endif
311
312 #ifdef COMPAT_FREEBSD5
313 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
314 #endif
315
316 /*
317 * This is really cheating. These actually live in the libc, something
318 * which I'm not quite sure is a good idea anyway, but in order for
319 * getnext and friends to actually work, we define dummies here.
320 */
321 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
322 "", 0, "PATH that finds all the standard utilities");
323 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
324 0, 0, "Max ibase/obase values in bc(1)");
325 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
326 0, 0, "Max array size in bc(1)");
327 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
328 0, 0, "Max scale value in bc(1)");
329 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
330 0, 0, "Max string length in bc(1)");
331 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
332 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
333 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
334 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
335 0, 0, "Max length (bytes) of a text-processing utility's input line");
336 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
337 0, 0, "Maximum number of repeats of a regexp permitted");
338 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
339 0, 0,
340 "The version of POSIX 1003.2 with which the system attempts to comply");
341 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
342 0, 0, "Whether C development supports the C bindings option");
343 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
344 0, 0, "Whether system supports the C development utilities option");
345 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
346 0, 0, "");
347 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
348 0, 0, "Whether system supports FORTRAN development utilities");
349 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
350 0, 0, "Whether system supports FORTRAN runtime utilities");
351 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
352 0, 0, "Whether system supports creation of locales");
353 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
354 0, 0, "Whether system supports software development utilities");
355 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
356 0, 0, "Whether system supports the user portability utilities");
357 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
358 0, 0, "Min Maximum number of streams a process may have open at one time");
359 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
360 0, 0, "Min Maximum number of types supported for timezone names");
361
362 #include <sys/vnode.h>
363 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
364 0, sizeof(struct vnode), "sizeof(struct vnode)");
365
366 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
367 0, sizeof(struct proc), "sizeof(struct proc)");
368
369 #include <sys/bio.h>
370 #include <sys/buf.h>
371 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
372 0, sizeof(struct bio), "sizeof(struct bio)");
373 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
374 0, sizeof(struct buf), "sizeof(struct buf)");
375
376 #include <sys/user.h>
377 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
378 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
379
380 /* XXX compatibility, remove for 6.0 */
381 #include <sys/imgact.h>
382 #include <sys/imgact_elf.h>
383 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
384 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
385 "compatibility for kern.fallback_elf_brand");
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