xref: /freebsd/sys/sys/sysctl.h (revision a0e793cbf1951d07fc47a0d9ea389d7dacba5213)
1 /*-
2  * Copyright (c) 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  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  *	@(#)sysctl.h	8.1 (Berkeley) 6/2/93
33  * $FreeBSD$
34  */
35 
36 #ifndef _SYS_SYSCTL_H_
37 #define	_SYS_SYSCTL_H_
38 
39 #include <sys/queue.h>
40 
41 struct thread;
42 /*
43  * Definitions for sysctl call.  The sysctl call uses a hierarchical name
44  * for objects that can be examined or modified.  The name is expressed as
45  * a sequence of integers.  Like a file path name, the meaning of each
46  * component depends on its place in the hierarchy.  The top-level and kern
47  * identifiers are defined here, and other identifiers are defined in the
48  * respective subsystem header files.
49  */
50 
51 #define	CTL_MAXNAME	24	/* largest number of components supported */
52 
53 /*
54  * Each subsystem defined by sysctl defines a list of variables
55  * for that subsystem. Each name is either a node with further
56  * levels defined below it, or it is a leaf of some particular
57  * type given below. Each sysctl level defines a set of name/type
58  * pairs to be used by sysctl(8) in manipulating the subsystem.
59  */
60 struct ctlname {
61 	char	*ctl_name;	/* subsystem name */
62 	int	 ctl_type;	/* type of name */
63 };
64 
65 #define	CTLTYPE		0xf	/* mask for the type */
66 #define	CTLTYPE_NODE	1	/* name is a node */
67 #define	CTLTYPE_INT	2	/* name describes an integer */
68 #define	CTLTYPE_STRING	3	/* name describes a string */
69 #define	CTLTYPE_S64	4	/* name describes a signed 64-bit number */
70 #define	CTLTYPE_OPAQUE	5	/* name describes a structure */
71 #define	CTLTYPE_STRUCT	CTLTYPE_OPAQUE	/* name describes a structure */
72 #define	CTLTYPE_UINT	6	/* name describes an unsigned integer */
73 #define	CTLTYPE_LONG	7	/* name describes a long */
74 #define	CTLTYPE_ULONG	8	/* name describes an unsigned long */
75 #define	CTLTYPE_U64	9	/* name describes an unsigned 64-bit number */
76 
77 #define	CTLFLAG_RD	0x80000000	/* Allow reads of variable */
78 #define	CTLFLAG_WR	0x40000000	/* Allow writes to the variable */
79 #define	CTLFLAG_RW	(CTLFLAG_RD|CTLFLAG_WR)
80 #define	CTLFLAG_ANYBODY	0x10000000	/* All users can set this var */
81 #define	CTLFLAG_SECURE	0x08000000	/* Permit set only if securelevel<=0 */
82 #define	CTLFLAG_PRISON	0x04000000	/* Prisoned roots can fiddle */
83 #define	CTLFLAG_DYN	0x02000000	/* Dynamic oid - can be freed */
84 #define	CTLFLAG_SKIP	0x01000000	/* Skip this sysctl when listing */
85 #define	CTLMASK_SECURE	0x00F00000	/* Secure level */
86 #define	CTLFLAG_TUN	0x00080000	/* Default value is loaded from getenv() */
87 #define	CTLFLAG_RDTUN	(CTLFLAG_RD|CTLFLAG_TUN)
88 #define	CTLFLAG_RWTUN	(CTLFLAG_RW|CTLFLAG_TUN)
89 #define	CTLFLAG_MPSAFE	0x00040000	/* Handler is MP safe */
90 #define	CTLFLAG_VNET	0x00020000	/* Prisons with vnet can fiddle */
91 #define	CTLFLAG_DYING	0x00010000	/* Oid is being removed */
92 #define	CTLFLAG_CAPRD	0x00008000	/* Can be read in capability mode */
93 #define	CTLFLAG_CAPWR	0x00004000	/* Can be written in capability mode */
94 #define	CTLFLAG_STATS	0x00002000	/* Statistics, not a tuneable */
95 #define	CTLFLAG_NOFETCH	0x00001000	/* Don't fetch tunable from getenv() */
96 #define	CTLFLAG_CAPRW	(CTLFLAG_CAPRD|CTLFLAG_CAPWR)
97 
98 /*
99  * Secure level.   Note that CTLFLAG_SECURE == CTLFLAG_SECURE1.
100  *
101  * Secure when the securelevel is raised to at least N.
102  */
103 #define	CTLSHIFT_SECURE	20
104 #define	CTLFLAG_SECURE1	(CTLFLAG_SECURE | (0 << CTLSHIFT_SECURE))
105 #define	CTLFLAG_SECURE2	(CTLFLAG_SECURE | (1 << CTLSHIFT_SECURE))
106 #define	CTLFLAG_SECURE3	(CTLFLAG_SECURE | (2 << CTLSHIFT_SECURE))
107 
108 /*
109  * USE THIS instead of a hardwired number from the categories below
110  * to get dynamically assigned sysctl entries using the linker-set
111  * technology. This is the way nearly all new sysctl variables should
112  * be implemented.
113  * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
114  */
115 #define	OID_AUTO	(-1)
116 
117 /*
118  * The starting number for dynamically-assigned entries.  WARNING!
119  * ALL static sysctl entries should have numbers LESS than this!
120  */
121 #define	CTL_AUTO_START	0x100
122 
123 #ifdef _KERNEL
124 #include <sys/linker_set.h>
125 
126 #define	SYSCTL_HANDLER_ARGS struct sysctl_oid *oidp, void *arg1,	\
127 	intptr_t arg2, struct sysctl_req *req
128 
129 /* definitions for sysctl_req 'lock' member */
130 #define	REQ_UNWIRED	1
131 #define	REQ_WIRED	2
132 
133 /* definitions for sysctl_req 'flags' member */
134 #if defined(__amd64__) || defined(__powerpc64__) ||\
135     (defined(__mips__) && defined(__mips_n64))
136 #define	SCTL_MASK32	1	/* 32 bit emulation */
137 #endif
138 
139 /*
140  * This describes the access space for a sysctl request.  This is needed
141  * so that we can use the interface from the kernel or from user-space.
142  */
143 struct sysctl_req {
144 	struct thread	*td;		/* used for access checking */
145 	int		 lock;		/* wiring state */
146 	void		*oldptr;
147 	size_t		 oldlen;
148 	size_t		 oldidx;
149 	int		(*oldfunc)(struct sysctl_req *, const void *, size_t);
150 	void		*newptr;
151 	size_t		 newlen;
152 	size_t		 newidx;
153 	int		(*newfunc)(struct sysctl_req *, void *, size_t);
154 	size_t		 validlen;
155 	int		 flags;
156 };
157 
158 SLIST_HEAD(sysctl_oid_list, sysctl_oid);
159 
160 /*
161  * This describes one "oid" in the MIB tree.  Potentially more nodes can
162  * be hidden behind it, expanded by the handler.
163  */
164 struct sysctl_oid {
165 	struct sysctl_oid_list oid_children;
166 	struct sysctl_oid_list *oid_parent;
167 	SLIST_ENTRY(sysctl_oid) oid_link;
168 	int		 oid_number;
169 	u_int		 oid_kind;
170 	void		*oid_arg1;
171 	intptr_t	 oid_arg2;
172 	const char	*oid_name;
173 	int		(*oid_handler)(SYSCTL_HANDLER_ARGS);
174 	const char	*oid_fmt;
175 	int		 oid_refcnt;
176 	u_int		 oid_running;
177 	const char	*oid_descr;
178 };
179 
180 #define	SYSCTL_IN(r, p, l)	(r->newfunc)(r, p, l)
181 #define	SYSCTL_OUT(r, p, l)	(r->oldfunc)(r, p, l)
182 
183 int sysctl_handle_int(SYSCTL_HANDLER_ARGS);
184 int sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS);
185 int sysctl_handle_long(SYSCTL_HANDLER_ARGS);
186 int sysctl_handle_64(SYSCTL_HANDLER_ARGS);
187 int sysctl_handle_string(SYSCTL_HANDLER_ARGS);
188 int sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
189 int sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS);
190 
191 int sysctl_handle_uma_zone_max(SYSCTL_HANDLER_ARGS);
192 int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS);
193 
194 int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS);
195 int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS);
196 int sysctl_dpcpu_quad(SYSCTL_HANDLER_ARGS);
197 
198 /*
199  * These functions are used to add/remove an oid from the mib.
200  */
201 void sysctl_register_oid(struct sysctl_oid *oidp);
202 void sysctl_unregister_oid(struct sysctl_oid *oidp);
203 
204 /* Declare a static oid to allow child oids to be added to it. */
205 #define	SYSCTL_DECL(name)			\
206 	extern struct sysctl_oid sysctl__##name
207 
208 /* Hide these in macros. */
209 #define	SYSCTL_CHILDREN(oid_ptr)		(&(oid_ptr)->oid_children)
210 #define	SYSCTL_PARENT(oid_ptr)					\
211     (((oid_ptr)->oid_parent != &sysctl__children) ?		\
212 	__containerof((oid_ptr)->oid_parent, struct sysctl_oid,	\
213 	oid_children) : (struct sysctl_oid *)NULL)
214 #define	SYSCTL_STATIC_CHILDREN(oid_name)	(&sysctl__##oid_name.oid_children)
215 
216 /* === Structs and macros related to context handling. === */
217 
218 /* All dynamically created sysctls can be tracked in a context list. */
219 struct sysctl_ctx_entry {
220 	struct sysctl_oid *entry;
221 	TAILQ_ENTRY(sysctl_ctx_entry) link;
222 };
223 
224 TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
225 
226 #define	SYSCTL_NODE_CHILDREN(parent, name) \
227 	sysctl__##parent##_##name.oid_children
228 
229 /*
230  * These macros provide type safety for sysctls.  SYSCTL_ALLOWED_TYPES()
231  * defines a transparent union of the allowed types.  SYSCTL_ASSERT_TYPE()
232  * and SYSCTL_ADD_ASSERT_TYPE() use the transparent union to assert that
233  * the pointer matches the allowed types.
234  *
235  * The allow_0 member allows a literal 0 to be passed for ptr.
236  */
237 #define	SYSCTL_ALLOWED_TYPES(type, decls)			\
238 	union sysctl_##type {					\
239 		long allow_0;					\
240 		decls						\
241 	} __attribute__((__transparent_union__));		\
242 								\
243 	static inline void *					\
244 	__sysctl_assert_##type(union sysctl_##type ptr)		\
245 	{							\
246 		return (ptr.a);					\
247 	}							\
248 	struct __hack
249 
250 SYSCTL_ALLOWED_TYPES(INT, int *a; );
251 SYSCTL_ALLOWED_TYPES(UINT, unsigned int *a; );
252 SYSCTL_ALLOWED_TYPES(LONG, long *a; );
253 SYSCTL_ALLOWED_TYPES(ULONG, unsigned long *a; );
254 SYSCTL_ALLOWED_TYPES(INT64, int64_t *a; long long *b; );
255 SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a; unsigned long long *b; );
256 
257 #ifdef notyet
258 #define	SYSCTL_ADD_ASSERT_TYPE(type, ptr)	\
259 	__sysctl_assert_ ## type (ptr)
260 #define	SYSCTL_ASSERT_TYPE(type, ptr, parent, name)	\
261 	_SYSCTL_ASSERT_TYPE(type, ptr, __LINE__, parent##_##name)
262 #else
263 #define	SYSCTL_ADD_ASSERT_TYPE(type, ptr)	ptr
264 #define	SYSCTL_ASSERT_TYPE(type, ptr, parent, name)
265 #endif
266 #define	_SYSCTL_ASSERT_TYPE(t, p, l, id)		\
267 	__SYSCTL_ASSERT_TYPE(t, p, l, id)
268 #define	__SYSCTL_ASSERT_TYPE(type, ptr, line, id)			\
269 	static inline void						\
270 	sysctl_assert_##line##_##id(void)				\
271 	{								\
272 		(void)__sysctl_assert_##type(ptr);			\
273 	}								\
274 	struct __hack
275 
276 #ifndef NO_SYSCTL_DESCR
277 #define	__DESCR(d) d
278 #else
279 #define	__DESCR(d) ""
280 #endif
281 
282 /* This macro is only for internal use */
283 #define	SYSCTL_OID_RAW(id, parent_child_head, nbr, name, kind, a1, a2, handler, fmt, descr) \
284 	struct sysctl_oid id = {					\
285 		.oid_parent = (parent_child_head),			\
286 		.oid_children = SLIST_HEAD_INITIALIZER(&id.oid_children), \
287 		.oid_number = (nbr),					\
288 		.oid_kind = (kind),					\
289 		.oid_arg1 = (a1),					\
290 		.oid_arg2 = (a2),					\
291 		.oid_name = (name),					\
292 		.oid_handler = (handler),				\
293 		.oid_fmt = (fmt),					\
294 		.oid_descr = __DESCR(descr)				\
295 	};								\
296 	DATA_SET(sysctl_set, id)
297 
298 /* This constructs a static "raw" MIB oid. */
299 #define	SYSCTL_OID(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
300     static SYSCTL_OID_RAW(sysctl__##parent##_##name, \
301 	SYSCTL_CHILDREN(&sysctl__##parent), \
302 	nbr, #name, kind, a1, a2, handler, fmt, descr)
303 
304 /* This constructs a global "raw" MIB oid. */
305 #define	SYSCTL_OID_GLOBAL(parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
306     SYSCTL_OID_RAW(sysctl__##parent##_##name, \
307 	SYSCTL_CHILDREN(&sysctl__##parent),	\
308 	nbr, #name, kind, a1, a2, handler, fmt, descr)
309 
310 #define	SYSCTL_ADD_OID(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, descr) \
311 	sysctl_add_oid(ctx, parent, nbr, name, kind, a1, a2, handler, fmt, __DESCR(descr))
312 
313 /* This constructs a root node from which other nodes can hang. */
314 #define	SYSCTL_ROOT_NODE(nbr, name, access, handler, descr)	\
315 	SYSCTL_OID_RAW(sysctl___##name, &sysctl__children,	\
316 		nbr, #name, CTLTYPE_NODE|(access), NULL, 0,	\
317 		handler, "N", descr)
318 
319 /* This constructs a node from which other oids can hang. */
320 #define	SYSCTL_NODE(parent, nbr, name, access, handler, descr)		    \
321 	SYSCTL_OID_GLOBAL(parent, nbr, name, CTLTYPE_NODE|(access),	    \
322 		NULL, 0, handler, "N", descr)
323 
324 #define	SYSCTL_ADD_NODE(ctx, parent, nbr, name, access, handler, descr)	    \
325 	sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|(access),	    \
326 	NULL, 0, handler, "N", __DESCR(descr))
327 
328 #define	SYSCTL_ADD_ROOT_NODE(ctx, nbr, name, access, handler, descr)	\
329 	sysctl_add_oid(ctx, &sysctl__children, nbr, name,		\
330         CTLTYPE_NODE|(access), NULL, 0, handler, "N", __DESCR(descr))
331 
332 /* Oid for a string.  len can be 0 to indicate '\0' termination. */
333 #define	SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) \
334 	SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
335 		arg, len, sysctl_handle_string, "A", descr)
336 
337 #define	SYSCTL_ADD_STRING(ctx, parent, nbr, name, access, arg, len, descr)  \
338 	sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access),	    \
339 	arg, len, sysctl_handle_string, "A", __DESCR(descr))
340 
341 /* Oid for an int.  If ptr is NULL, val is returned. */
342 #define	SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)		\
343 	SYSCTL_ASSERT_TYPE(INT, ptr, parent, name);			\
344 	SYSCTL_OID(parent, nbr, name,					\
345 	    CTLTYPE_INT | CTLFLAG_MPSAFE | (access),			\
346 	    ptr, val, sysctl_handle_int, "I", descr)
347 
348 #define	SYSCTL_ADD_INT(ctx, parent, nbr, name, access, ptr, val, descr)	\
349 	sysctl_add_oid(ctx, parent, nbr, name,				\
350 	    CTLTYPE_INT | CTLFLAG_MPSAFE | (access),			\
351 	    SYSCTL_ADD_ASSERT_TYPE(INT, ptr), val,			\
352 	    sysctl_handle_int, "I", __DESCR(descr))
353 
354 /* Oid for an unsigned int.  If ptr is NULL, val is returned. */
355 #define	SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)		\
356 	SYSCTL_ASSERT_TYPE(UINT, ptr, parent, name);			\
357 	SYSCTL_OID(parent, nbr, name,					\
358 	    CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),			\
359 	    ptr, val, sysctl_handle_int, "IU", descr)
360 
361 #define	SYSCTL_ADD_UINT(ctx, parent, nbr, name, access, ptr, val, descr) \
362 	sysctl_add_oid(ctx, parent, nbr, name,				\
363 	    CTLTYPE_UINT | CTLFLAG_MPSAFE | (access),			\
364 	    SYSCTL_ADD_ASSERT_TYPE(UINT, ptr), val,			\
365 	    sysctl_handle_int, "IU", __DESCR(descr))
366 
367 /* Oid for a long.  The pointer must be non NULL. */
368 #define	SYSCTL_LONG(parent, nbr, name, access, ptr, val, descr)		\
369 	SYSCTL_ASSERT_TYPE(LONG, ptr, parent, name);			\
370 	SYSCTL_OID(parent, nbr, name,					\
371 	    CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),			\
372 	    ptr, val, sysctl_handle_long, "L", descr)
373 
374 #define	SYSCTL_ADD_LONG(ctx, parent, nbr, name, access, ptr, descr)	\
375 	sysctl_add_oid(ctx, parent, nbr, name,				\
376 	    CTLTYPE_LONG | CTLFLAG_MPSAFE | (access),			\
377 	    SYSCTL_ADD_ASSERT_TYPE(LONG, ptr), 0,			\
378 	    sysctl_handle_long,	"L", __DESCR(descr))
379 
380 /* Oid for an unsigned long.  The pointer must be non NULL. */
381 #define	SYSCTL_ULONG(parent, nbr, name, access, ptr, val, descr)	\
382 	SYSCTL_ASSERT_TYPE(ULONG, ptr, parent, name);			\
383 	SYSCTL_OID(parent, nbr, name,					\
384 	    CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),			\
385 	    ptr, val, sysctl_handle_long, "LU", descr)
386 
387 #define	SYSCTL_ADD_ULONG(ctx, parent, nbr, name, access, ptr, descr)	\
388 	sysctl_add_oid(ctx, parent, nbr, name,				\
389 	    CTLTYPE_ULONG | CTLFLAG_MPSAFE | (access),			\
390 	    SYSCTL_ADD_ASSERT_TYPE(ULONG, ptr), 0,			\
391 	    sysctl_handle_long, "LU", __DESCR(descr))
392 
393 /* Oid for a quad.  The pointer must be non NULL. */
394 #define	SYSCTL_QUAD(parent, nbr, name, access, ptr, val, descr)		\
395 	SYSCTL_ASSERT_TYPE(INT64, ptr, parent, name);			\
396 	SYSCTL_OID(parent, nbr, name,					\
397 	    CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),			\
398 	    ptr, val, sysctl_handle_64, "Q", descr)
399 
400 #define	SYSCTL_ADD_QUAD(ctx, parent, nbr, name, access, ptr, descr)	\
401 	sysctl_add_oid(ctx, parent, nbr, name,				\
402 	    CTLTYPE_S64 | CTLFLAG_MPSAFE | (access),			\
403 	    SYSCTL_ADD_ASSERT_TYPE(INT64, ptr), 0,			\
404 	    sysctl_handle_64, "Q", __DESCR(descr))
405 
406 #define	SYSCTL_UQUAD(parent, nbr, name, access, ptr, val, descr)	\
407 	SYSCTL_ASSERT_TYPE(UINT64, ptr, parent, name);			\
408 	SYSCTL_OID(parent, nbr, name,					\
409 	    CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),			\
410 	    ptr, val, sysctl_handle_64, "QU", descr)
411 
412 #define	SYSCTL_ADD_UQUAD(ctx, parent, nbr, name, access, ptr, descr)	\
413 	sysctl_add_oid(ctx, parent, nbr, name,				\
414 	    CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),			\
415 	    SYSCTL_ADD_ASSERT_TYPE(UINT64, ptr), 0,			\
416 	    sysctl_handle_64, "QU", __DESCR(descr))
417 
418 /* Oid for a 64-bit unsigned counter(9).  The pointer must be non NULL. */
419 #define	SYSCTL_COUNTER_U64(parent, nbr, name, access, ptr, descr)	\
420 	SYSCTL_ASSERT_TYPE(UINT64, ptr, parent, name);			\
421 	SYSCTL_OID(parent, nbr, name,					\
422 	    CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),			\
423 	    ptr, 0, sysctl_handle_counter_u64, "QU", descr)
424 
425 #define	SYSCTL_ADD_COUNTER_U64(ctx, parent, nbr, name, access, ptr, descr)\
426 	sysctl_add_oid(ctx, parent, nbr, name,				\
427 	    CTLTYPE_U64 | CTLFLAG_MPSAFE | (access),			\
428 	    SYSCTL_ADD_ASSERT_TYPE(UINT64, ptr), 0,			\
429 	    sysctl_handle_counter_u64, "QU", __DESCR(descr))
430 
431 /* Oid for an opaque object.  Specified by a pointer and a length. */
432 #define	SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) \
433 	SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \
434 		ptr, len, sysctl_handle_opaque, fmt, descr)
435 
436 #define	SYSCTL_ADD_OPAQUE(ctx, parent, nbr, name, access, ptr, len, fmt, descr)\
437 	sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access),	    \
438 	ptr, len, sysctl_handle_opaque, fmt, __DESCR(descr))
439 
440 /* Oid for a struct.  Specified by a pointer and a type. */
441 #define	SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) \
442 	SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), \
443 		ptr, sizeof(struct type), sysctl_handle_opaque, \
444 		"S," #type, descr)
445 
446 #define	SYSCTL_ADD_STRUCT(ctx, parent, nbr, name, access, ptr, type, descr) \
447 	sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_OPAQUE|(access),	    \
448 	ptr, sizeof(struct type), sysctl_handle_opaque, "S," #type, __DESCR(descr))
449 
450 /* Oid for a procedure.  Specified by a pointer and an arg. */
451 #define	SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
452 	CTASSERT(((access) & CTLTYPE) != 0);				\
453 	SYSCTL_OID(parent, nbr, name, (access), \
454 		ptr, arg, handler, fmt, descr)
455 
456 #define	SYSCTL_ADD_PROC(ctx, parent, nbr, name, access, ptr, arg, handler, fmt, descr) \
457 	sysctl_add_oid(ctx, parent, nbr, name, (access),			    \
458 	ptr, arg, handler, fmt, __DESCR(descr))
459 
460 /* Oid to handle limits on uma(9) zone specified by pointer. */
461 #define	SYSCTL_UMA_MAX(parent, nbr, name, access, ptr, descr)		\
462 	SYSCTL_ASSERT_TYPE(INT, ptr, parent, name);			\
463 	SYSCTL_OID(parent, nbr, name,					\
464 	    CTLTYPE_INT | CTLFLAG_MPSAFE | (access),			\
465 	    ptr, 0, sysctl_handle_uma_zone_max, "I", descr)
466 #define	SYSCTL_ADD_UMA_MAX(ctx, parent, nbr, name, access, ptr, descr)\
467 	sysctl_add_oid(ctx, parent, nbr, name,				\
468 	    CTLTYPE_INT | CTLFLAG_MPSAFE | (access),			\
469 	    SYSCTL_ADD_ASSERT_TYPE(INT, ptr), 0,			\
470 	    sysctl_handle_uma_zone_max, "I", __DESCR(descr))
471 
472 /* Oid to obtain current use of uma(9) zone specified by pointer. */
473 #define	SYSCTL_UMA_CUR(parent, nbr, name, access, ptr, descr)		\
474 	SYSCTL_ASSERT_TYPE(INT, ptr, parent, name);			\
475 	SYSCTL_OID(parent, nbr, name,					\
476 	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
477 	    ptr, 0, sysctl_handle_uma_zone_cur, "I", descr)
478 #define	SYSCTL_ADD_UMA_CUR(ctx, parent, nbr, name, access, ptr, descr)	\
479 	sysctl_add_oid(ctx, parent, nbr, name,				\
480 	    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access),	\
481 	    SYSCTL_ADD_ASSERT_TYPE(INT, ptr), 0,			\
482 	    sysctl_handle_uma_zone_cur, "I", __DESCR(descr))
483 
484 /*
485  * A macro to generate a read-only sysctl to indicate the presense of optional
486  * kernel features.
487  */
488 #define	FEATURE(name, desc)						\
489 	SYSCTL_INT(_kern_features, OID_AUTO, name, CTLFLAG_RD | CTLFLAG_CAPRD, \
490 	    NULL, 1, desc)
491 
492 #endif /* _KERNEL */
493 
494 /*
495  * Top-level identifiers
496  */
497 #define	CTL_UNSPEC	0		/* unused */
498 #define	CTL_KERN	1		/* "high kernel": proc, limits */
499 #define	CTL_VM		2		/* virtual memory */
500 #define	CTL_VFS		3		/* filesystem, mount type is next */
501 #define	CTL_NET		4		/* network, see socket.h */
502 #define	CTL_DEBUG	5		/* debugging parameters */
503 #define	CTL_HW		6		/* generic cpu/io */
504 #define	CTL_MACHDEP	7		/* machine dependent */
505 #define	CTL_USER	8		/* user-level */
506 #define	CTL_P1003_1B	9		/* POSIX 1003.1B */
507 
508 /*
509  * CTL_KERN identifiers
510  */
511 #define	KERN_OSTYPE		 1	/* string: system version */
512 #define	KERN_OSRELEASE		 2	/* string: system release */
513 #define	KERN_OSREV		 3	/* int: system revision */
514 #define	KERN_VERSION		 4	/* string: compile time info */
515 #define	KERN_MAXVNODES		 5	/* int: max vnodes */
516 #define	KERN_MAXPROC		 6	/* int: max processes */
517 #define	KERN_MAXFILES		 7	/* int: max open files */
518 #define	KERN_ARGMAX		 8	/* int: max arguments to exec */
519 #define	KERN_SECURELVL		 9	/* int: system security level */
520 #define	KERN_HOSTNAME		10	/* string: hostname */
521 #define	KERN_HOSTID		11	/* int: host identifier */
522 #define	KERN_CLOCKRATE		12	/* struct: struct clockrate */
523 #define	KERN_VNODE		13	/* struct: vnode structures */
524 #define	KERN_PROC		14	/* struct: process entries */
525 #define	KERN_FILE		15	/* struct: file entries */
526 #define	KERN_PROF		16	/* node: kernel profiling info */
527 #define	KERN_POSIX1		17	/* int: POSIX.1 version */
528 #define	KERN_NGROUPS		18	/* int: # of supplemental group ids */
529 #define	KERN_JOB_CONTROL	19	/* int: is job control available */
530 #define	KERN_SAVED_IDS		20	/* int: saved set-user/group-ID */
531 #define	KERN_BOOTTIME		21	/* struct: time kernel was booted */
532 #define	KERN_NISDOMAINNAME	22	/* string: YP domain name */
533 #define	KERN_UPDATEINTERVAL	23	/* int: update process sleep time */
534 #define	KERN_OSRELDATE		24	/* int: kernel release date */
535 #define	KERN_NTP_PLL		25	/* node: NTP PLL control */
536 #define	KERN_BOOTFILE		26	/* string: name of booted kernel */
537 #define	KERN_MAXFILESPERPROC	27	/* int: max open files per proc */
538 #define	KERN_MAXPROCPERUID	28	/* int: max processes per uid */
539 #define	KERN_DUMPDEV		29	/* struct cdev *: device to dump on */
540 #define	KERN_IPC		30	/* node: anything related to IPC */
541 #define	KERN_DUMMY		31	/* unused */
542 #define	KERN_PS_STRINGS		32	/* int: address of PS_STRINGS */
543 #define	KERN_USRSTACK		33	/* int: address of USRSTACK */
544 #define	KERN_LOGSIGEXIT		34	/* int: do we log sigexit procs? */
545 #define	KERN_IOV_MAX		35	/* int: value of UIO_MAXIOV */
546 #define	KERN_HOSTUUID		36	/* string: host UUID identifier */
547 #define	KERN_ARND		37	/* int: from arc4rand() */
548 /*
549  * KERN_PROC subtypes
550  */
551 #define	KERN_PROC_ALL		0	/* everything */
552 #define	KERN_PROC_PID		1	/* by process id */
553 #define	KERN_PROC_PGRP		2	/* by process group id */
554 #define	KERN_PROC_SESSION	3	/* by session of pid */
555 #define	KERN_PROC_TTY		4	/* by controlling tty */
556 #define	KERN_PROC_UID		5	/* by effective uid */
557 #define	KERN_PROC_RUID		6	/* by real uid */
558 #define	KERN_PROC_ARGS		7	/* get/set arguments/proctitle */
559 #define	KERN_PROC_PROC		8	/* only return procs */
560 #define	KERN_PROC_SV_NAME	9	/* get syscall vector name */
561 #define	KERN_PROC_RGID		10	/* by real group id */
562 #define	KERN_PROC_GID		11	/* by effective group id */
563 #define	KERN_PROC_PATHNAME	12	/* path to executable */
564 #define	KERN_PROC_OVMMAP	13	/* Old VM map entries for process */
565 #define	KERN_PROC_OFILEDESC	14	/* Old file descriptors for process */
566 #define	KERN_PROC_KSTACK	15	/* Kernel stacks for process */
567 #define	KERN_PROC_INC_THREAD	0x10	/*
568 					 * modifier for pid, pgrp, tty,
569 					 * uid, ruid, gid, rgid and proc
570 					 * This effectively uses 16-31
571 					 */
572 #define	KERN_PROC_VMMAP		32	/* VM map entries for process */
573 #define	KERN_PROC_FILEDESC	33	/* File descriptors for process */
574 #define	KERN_PROC_GROUPS	34	/* process groups */
575 #define	KERN_PROC_ENV		35	/* get environment */
576 #define	KERN_PROC_AUXV		36	/* get ELF auxiliary vector */
577 #define	KERN_PROC_RLIMIT	37	/* process resource limits */
578 #define	KERN_PROC_PS_STRINGS	38	/* get ps_strings location */
579 #define	KERN_PROC_UMASK		39	/* process umask */
580 #define	KERN_PROC_OSREL		40	/* osreldate for process binary */
581 #define	KERN_PROC_SIGTRAMP	41	/* signal trampoline location */
582 
583 /*
584  * KERN_IPC identifiers
585  */
586 #define	KIPC_MAXSOCKBUF		1	/* int: max size of a socket buffer */
587 #define	KIPC_SOCKBUF_WASTE	2	/* int: wastage factor in sockbuf */
588 #define	KIPC_SOMAXCONN		3	/* int: max length of connection q */
589 #define	KIPC_MAX_LINKHDR	4	/* int: max length of link header */
590 #define	KIPC_MAX_PROTOHDR	5	/* int: max length of network header */
591 #define	KIPC_MAX_HDR		6	/* int: max total length of headers */
592 #define	KIPC_MAX_DATALEN	7	/* int: max length of data? */
593 
594 /*
595  * CTL_HW identifiers
596  */
597 #define	HW_MACHINE	 1		/* string: machine class */
598 #define	HW_MODEL	 2		/* string: specific machine model */
599 #define	HW_NCPU		 3		/* int: number of cpus */
600 #define	HW_BYTEORDER	 4		/* int: machine byte order */
601 #define	HW_PHYSMEM	 5		/* int: total memory */
602 #define	HW_USERMEM	 6		/* int: non-kernel memory */
603 #define	HW_PAGESIZE	 7		/* int: software page size */
604 #define	HW_DISKNAMES	 8		/* strings: disk drive names */
605 #define	HW_DISKSTATS	 9		/* struct: diskstats[] */
606 #define	HW_FLOATINGPT	10		/* int: has HW floating point? */
607 #define	HW_MACHINE_ARCH	11		/* string: machine architecture */
608 #define	HW_REALMEM	12		/* int: 'real' memory */
609 
610 /*
611  * CTL_USER definitions
612  */
613 #define	USER_CS_PATH		 1	/* string: _CS_PATH */
614 #define	USER_BC_BASE_MAX	 2	/* int: BC_BASE_MAX */
615 #define	USER_BC_DIM_MAX		 3	/* int: BC_DIM_MAX */
616 #define	USER_BC_SCALE_MAX	 4	/* int: BC_SCALE_MAX */
617 #define	USER_BC_STRING_MAX	 5	/* int: BC_STRING_MAX */
618 #define	USER_COLL_WEIGHTS_MAX	 6	/* int: COLL_WEIGHTS_MAX */
619 #define	USER_EXPR_NEST_MAX	 7	/* int: EXPR_NEST_MAX */
620 #define	USER_LINE_MAX		 8	/* int: LINE_MAX */
621 #define	USER_RE_DUP_MAX		 9	/* int: RE_DUP_MAX */
622 #define	USER_POSIX2_VERSION	10	/* int: POSIX2_VERSION */
623 #define	USER_POSIX2_C_BIND	11	/* int: POSIX2_C_BIND */
624 #define	USER_POSIX2_C_DEV	12	/* int: POSIX2_C_DEV */
625 #define	USER_POSIX2_CHAR_TERM	13	/* int: POSIX2_CHAR_TERM */
626 #define	USER_POSIX2_FORT_DEV	14	/* int: POSIX2_FORT_DEV */
627 #define	USER_POSIX2_FORT_RUN	15	/* int: POSIX2_FORT_RUN */
628 #define	USER_POSIX2_LOCALEDEF	16	/* int: POSIX2_LOCALEDEF */
629 #define	USER_POSIX2_SW_DEV	17	/* int: POSIX2_SW_DEV */
630 #define	USER_POSIX2_UPE		18	/* int: POSIX2_UPE */
631 #define	USER_STREAM_MAX		19	/* int: POSIX2_STREAM_MAX */
632 #define	USER_TZNAME_MAX		20	/* int: POSIX2_TZNAME_MAX */
633 
634 #define	CTL_P1003_1B_ASYNCHRONOUS_IO		1	/* boolean */
635 #define	CTL_P1003_1B_MAPPED_FILES		2	/* boolean */
636 #define	CTL_P1003_1B_MEMLOCK			3	/* boolean */
637 #define	CTL_P1003_1B_MEMLOCK_RANGE		4	/* boolean */
638 #define	CTL_P1003_1B_MEMORY_PROTECTION		5	/* boolean */
639 #define	CTL_P1003_1B_MESSAGE_PASSING		6	/* boolean */
640 #define	CTL_P1003_1B_PRIORITIZED_IO		7	/* boolean */
641 #define	CTL_P1003_1B_PRIORITY_SCHEDULING	8	/* boolean */
642 #define	CTL_P1003_1B_REALTIME_SIGNALS		9	/* boolean */
643 #define	CTL_P1003_1B_SEMAPHORES			10	/* boolean */
644 #define	CTL_P1003_1B_FSYNC			11	/* boolean */
645 #define	CTL_P1003_1B_SHARED_MEMORY_OBJECTS	12	/* boolean */
646 #define	CTL_P1003_1B_SYNCHRONIZED_IO		13	/* boolean */
647 #define	CTL_P1003_1B_TIMERS			14	/* boolean */
648 #define	CTL_P1003_1B_AIO_LISTIO_MAX		15	/* int */
649 #define	CTL_P1003_1B_AIO_MAX			16	/* int */
650 #define	CTL_P1003_1B_AIO_PRIO_DELTA_MAX		17	/* int */
651 #define	CTL_P1003_1B_DELAYTIMER_MAX		18	/* int */
652 #define	CTL_P1003_1B_MQ_OPEN_MAX		19	/* int */
653 #define	CTL_P1003_1B_PAGESIZE			20	/* int */
654 #define	CTL_P1003_1B_RTSIG_MAX			21	/* int */
655 #define	CTL_P1003_1B_SEM_NSEMS_MAX		22	/* int */
656 #define	CTL_P1003_1B_SEM_VALUE_MAX		23	/* int */
657 #define	CTL_P1003_1B_SIGQUEUE_MAX		24	/* int */
658 #define	CTL_P1003_1B_TIMER_MAX			25	/* int */
659 
660 #define	CTL_P1003_1B_MAXID		26
661 
662 #ifdef _KERNEL
663 
664 /*
665  * Declare some common oids.
666  */
667 extern struct sysctl_oid_list sysctl__children;
668 SYSCTL_DECL(_kern);
669 SYSCTL_DECL(_kern_features);
670 SYSCTL_DECL(_kern_ipc);
671 SYSCTL_DECL(_kern_proc);
672 SYSCTL_DECL(_kern_sched);
673 SYSCTL_DECL(_kern_sched_stats);
674 SYSCTL_DECL(_sysctl);
675 SYSCTL_DECL(_vm);
676 SYSCTL_DECL(_vm_stats);
677 SYSCTL_DECL(_vm_stats_misc);
678 SYSCTL_DECL(_vfs);
679 SYSCTL_DECL(_net);
680 SYSCTL_DECL(_debug);
681 SYSCTL_DECL(_debug_sizeof);
682 SYSCTL_DECL(_dev);
683 SYSCTL_DECL(_hw);
684 SYSCTL_DECL(_hw_bus);
685 SYSCTL_DECL(_hw_bus_devices);
686 SYSCTL_DECL(_hw_bus_info);
687 SYSCTL_DECL(_machdep);
688 SYSCTL_DECL(_user);
689 SYSCTL_DECL(_compat);
690 SYSCTL_DECL(_regression);
691 SYSCTL_DECL(_security);
692 SYSCTL_DECL(_security_bsd);
693 
694 extern char	machine[];
695 extern char	osrelease[];
696 extern char	ostype[];
697 extern char	kern_ident[];
698 
699 /* Dynamic oid handling */
700 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
701 	    struct sysctl_oid_list *parent, int nbr, const char *name, int kind,
702 	    void *arg1, intptr_t arg2, int (*handler)(SYSCTL_HANDLER_ARGS),
703 	    const char *fmt, const char *descr);
704 int	sysctl_remove_name(struct sysctl_oid *parent, const char *name, int del,
705 	    int recurse);
706 void	sysctl_rename_oid(struct sysctl_oid *oidp, const char *name);
707 int	sysctl_move_oid(struct sysctl_oid *oidp,
708 	    struct sysctl_oid_list *parent);
709 int	sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse);
710 int	sysctl_ctx_init(struct sysctl_ctx_list *clist);
711 int	sysctl_ctx_free(struct sysctl_ctx_list *clist);
712 struct	sysctl_ctx_entry *sysctl_ctx_entry_add(struct sysctl_ctx_list *clist,
713 	    struct sysctl_oid *oidp);
714 struct	sysctl_ctx_entry *sysctl_ctx_entry_find(struct sysctl_ctx_list *clist,
715 	    struct sysctl_oid *oidp);
716 int	sysctl_ctx_entry_del(struct sysctl_ctx_list *clist,
717 	    struct sysctl_oid *oidp);
718 
719 int	kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old,
720 	    size_t *oldlenp, void *new, size_t newlen, size_t *retval,
721 	    int flags);
722 int	kernel_sysctlbyname(struct thread *td, char *name, void *old,
723 	    size_t *oldlenp, void *new, size_t newlen, size_t *retval,
724 	    int flags);
725 int	userland_sysctl(struct thread *td, int *name, u_int namelen, void *old,
726 	    size_t *oldlenp, int inkernel, void *new, size_t newlen,
727 	    size_t *retval, int flags);
728 int	sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid,
729 	    int *nindx, struct sysctl_req *req);
730 void	sysctl_lock(void);
731 void	sysctl_unlock(void);
732 int	sysctl_wire_old_buffer(struct sysctl_req *req, size_t len);
733 
734 struct sbuf;
735 struct sbuf *sbuf_new_for_sysctl(struct sbuf *, char *, int,
736 	    struct sysctl_req *);
737 #else	/* !_KERNEL */
738 #include <sys/cdefs.h>
739 
740 __BEGIN_DECLS
741 int	sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
742 int	sysctlbyname(const char *, void *, size_t *, const void *, size_t);
743 int	sysctlnametomib(const char *, int *, size_t *);
744 __END_DECLS
745 #endif	/* _KERNEL */
746 
747 #endif	/* !_SYS_SYSCTL_H_ */
748