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. 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 * $FreeBSD: src/sys/kern/kern_mib.c,v 1.29.2.4 2001/07/30 23:28:00 peter Exp $
37 */
38
39 #include <sys/param.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/sysctl.h>
43 #include <sys/proc.h>
44 #include <sys/lockf.h>
45 #include <sys/jail.h>
46 #include <sys/unistd.h>
47 #include <machine/tls.h>
48 #include <machine/smp.h>
49
50 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
51 "Sysctl internal magic");
52 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
53 "High kernel, proc, limits &c");
54 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
55 "Virtual memory");
56 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
57 "File system");
58 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
59 "Network, (see socket.h)");
60 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
61 "Debugging");
62 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
63 "Size of various kernel data structures");
64 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
65 "hardware");
66 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
67 "machine dependent");
68 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
69 "user-level");
70 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
71 "p1003_1b, (see p1003_1b.h)");
72 SYSCTL_NODE(, CTL_LWKT, lwkt, CTLFLAG_RW, 0,
73 "light weight kernel threads");
74
75 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
76 "Compatibility code");
77 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
78 "Security");
79
80 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD | CTLFLAG_NOLOCK,
81 kern_ident, 0, "Kernel identifier");
82
83 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD | CTLFLAG_NOLOCK,
84 osrelease, 0, "Operating system type");
85
86 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
87 0, __DragonFly_version, "Operating system revision");
88
89 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD | CTLFLAG_NOLOCK,
90 version, 0, "Kernel version");
91
92 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_NOLOCK,
93 ostype, 0, "Operating system type");
94
95 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
96 &osreldate, 0, "Operating system release date");
97
98 static int tls_extra = RTLD_STATIC_TLS_EXTRA_DEFAULT;
99 SYSCTL_INT(_kern, KERN_STATIC_TLS_EXTRA, tls_extra, CTLFLAG_RW | CTLFLAG_NOLOCK,
100 &tls_extra, 0, "Extra static tls space for libraries");
101
102 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD,
103 &maxproc, 0, "Maximum number of processes");
104
105 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
106 &maxprocperuid, 0, "Maximum processes allowed per userid");
107
108 SYSCTL_INT(_kern, KERN_MAXPOSIXLOCKSPERUID, maxposixlocksperuid, CTLFLAG_RW,
109 &maxposixlocksperuid, 0, "Maximum number of POSIX-type locks per user id");
110
111 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD,
112 &maxusers, 0, "Hint for kernel tuning");
113
114 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
115 0, ARG_MAX, "Maximum bytes of argument to execve(2)");
116
117 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
118 0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
119
120 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
121 0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
122
123 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
124 0, 1, "Whether job control is available");
125
126 #ifdef _POSIX_SAVED_IDS
127 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
128 0, 1, "Whether saved set-group/user ID is available");
129 #else
130 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
131 0, 0, "Whether saved set-group/user ID is available");
132 #endif
133
134 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
135
136 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
137 kernelname, sizeof kernelname, "Name of kernel file booted");
138
139 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
140 &ncpus, 0, "Number of active CPUs");
141
142 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
143 0, BYTE_ORDER, "System byte order");
144
145 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
146 0, PAGE_SIZE, "System memory page size");
147
148 static char platform[] = MACHINE_PLATFORM;
149 SYSCTL_STRING(_hw, HW_MACHINE_PLATFORM, platform, CTLFLAG_RD | CTLFLAG_NOLOCK,
150 platform, 0, "Platform architecture");
151
152 static char machine_arch[] = MACHINE_ARCH;
153 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD | CTLFLAG_NOLOCK,
154 machine_arch, 0, "Cpu architecture");
155
156 char hostname[MAXHOSTNAMELEN];
157
158 /*
159 * Hostname sysctl handler. We use CTLFLAG_NOLOCK to avoid acquiring
160 * the per-oid lock. The per-cpu SLOCK is still acquired, so to interlock
161 * against setting the hostname we relock with XLOCK. The result is
162 * that the critical path (just reading the hostname) gets one less lock
163 * and will have improved performance.
164 */
165 static int
sysctl_hostname(SYSCTL_HANDLER_ARGS)166 sysctl_hostname(SYSCTL_HANDLER_ARGS)
167 {
168 struct thread *td = req->td;
169 struct proc *p = td ? td->td_proc : NULL;
170 struct prison *pr;
171 int error;
172
173 if (req->newptr) {
174 SYSCTL_SUNLOCK();
175 SYSCTL_XLOCK();
176 }
177 if (p)
178 pr = p->p_ucred->cr_prison;
179 if (p && pr) {
180 if (!PRISON_CAP_ISSET(pr->pr_caps,
181 PRISON_CAP_SYS_SET_HOSTNAME) && req->newptr)
182 return(EPERM);
183 error = sysctl_handle_string(oidp,
184 p->p_ucred->cr_prison->pr_host,
185 sizeof p->p_ucred->cr_prison->pr_host, req);
186 } else {
187 error = sysctl_handle_string(oidp,
188 hostname, sizeof hostname, req);
189 }
190 if (req->newptr) {
191 SYSCTL_XUNLOCK();
192 SYSCTL_SLOCK();
193 }
194 return (error);
195 }
196
197 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
198 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NOLOCK,
199 0, 0, sysctl_hostname, "A", "Hostname");
200
201 int securelevel = -1;
202 int kernel_mem_readonly = 0;
203
204 static int
sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)205 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
206 {
207 int error, level;
208
209 level = securelevel;
210 error = sysctl_handle_int(oidp, &level, 0, req);
211 if (error || !req->newptr)
212 return (error);
213 if (level < securelevel)
214 return (EPERM);
215 securelevel = level;
216 return (error);
217 }
218
219 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
220 0, 0, sysctl_kern_securelvl, "I", "Current secure level");
221
222 char domainname[MAXHOSTNAMELEN];
223 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
224 &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
225
226 unsigned long hostid;
227 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
228
229 /*
230 * This is really cheating. These actually live in the libc, something
231 * which I'm not quite sure is a good idea anyway, but in order for
232 * getnext and friends to actually work, we define dummies here.
233 */
234 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
235 "", 0, "PATH that finds all the standard utilities");
236 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
237 0, 0, "Max ibase/obase values in bc(1)");
238 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
239 0, 0, "Max array size in bc(1)");
240 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
241 0, 0, "Max scale value in bc(1)");
242 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
243 0, 0, "Max string length in bc(1)");
244 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
245 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
246 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
247 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
248 0, 0, "Max length (bytes) of a text-processing utility's input line");
249 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
250 0, 0, "Maximum number of repeats of a regexp permitted");
251 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
252 0, 0,
253 "The version of POSIX 1003.2 with which the system attempts to comply");
254 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
255 0, 0, "Whether C development supports the C bindings option");
256 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
257 0, 0, "Whether system supports the C development utilities option");
258 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
259 0, 0, "");
260 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
261 0, 0, "Whether system supports FORTRAN development utilities");
262 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
263 0, 0, "Whether system supports FORTRAN runtime utilities");
264 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
265 0, 0, "Whether system supports creation of locales");
266 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
267 0, 0, "Whether system supports software development utilities");
268 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
269 0, 0, "Whether system supports the user portability utilities");
270 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
271 0, 0, "Min Maximum number of streams a process may have open at one time");
272 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
273 0, 0, "Min Maximum number of types supported for timezone names");
274
275 #include <sys/vnode.h>
276 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
277 0, sizeof(struct vnode), "sizeof(struct vnode)");
278
279 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
280 0, sizeof(struct proc), "sizeof(struct proc)");
281
282 #include <sys/conf.h>
283 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
284 0, sizeof(struct cdev), "sizeof(struct cdev)");
285
286 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
287