e1996cb960
vmcnts. This can be used to abstract away pcpu details but also changes to use atomics for all counters now. This means sched lock is no longer responsible for protecting counts in the switch routines. Contributed by: Attilio Rao <attilio@FreeBSD.org>
414 lines
14 KiB
C
414 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Mike Karels at Berkeley Software Design, Inc.
|
|
*
|
|
* Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
|
|
* project, to make these variables more userfriendly.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_posix.h"
|
|
#include "opt_config.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sbuf.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/unistd.h>
|
|
|
|
SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
|
|
"Sysctl internal magic");
|
|
SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
|
|
"High kernel, proc, limits &c");
|
|
SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
|
|
"Virtual memory");
|
|
SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
|
|
"File system");
|
|
SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
|
|
"Network, (see socket.h)");
|
|
SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
|
|
"Debugging");
|
|
SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
|
|
"Sizeof various things");
|
|
SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
|
|
"hardware");
|
|
SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
|
|
"machine dependent");
|
|
SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
|
|
"user-level");
|
|
SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
|
|
"p1003_1b, (see p1003_1b.h)");
|
|
|
|
SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
|
|
"Compatibility code");
|
|
SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
|
|
"Security");
|
|
#ifdef REGRESSION
|
|
SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
|
|
"Regression test MIB");
|
|
#endif
|
|
|
|
SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
|
|
kern_ident, 0, "Kernel identifier");
|
|
|
|
SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
|
|
osrelease, 0, "Operating system release");
|
|
|
|
SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
|
|
0, BSD, "Operating system revision");
|
|
|
|
SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
|
|
version, 0, "Kernel version");
|
|
|
|
SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
|
|
ostype, 0, "Operating system type");
|
|
|
|
/*
|
|
* NOTICE: The *userland* release date is available in
|
|
* /usr/include/osreldate.h
|
|
*/
|
|
extern int osreldate;
|
|
SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
|
|
&osreldate, 0, "Kernel release date");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
|
|
&maxproc, 0, "Maximum number of processes");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
|
|
&maxprocperuid, 0, "Maximum processes allowed per userid");
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
|
|
&maxusers, 0, "Hint for kernel tuning");
|
|
|
|
SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
|
|
0, ARG_MAX, "Maximum bytes of argument to execve(2)");
|
|
|
|
SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
|
|
0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
|
|
|
|
SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
|
|
0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
|
|
|
|
SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
|
|
0, 1, "Whether job control is available");
|
|
|
|
#ifdef _POSIX_SAVED_IDS
|
|
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
|
|
0, 1, "Whether saved set-group/user ID is available");
|
|
#else
|
|
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
|
|
0, 0, "Whether saved set-group/user ID is available");
|
|
#endif
|
|
|
|
char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
|
|
|
|
SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
|
|
kernelname, sizeof kernelname, "Name of kernel file booted");
|
|
|
|
SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
|
|
&mp_ncpus, 0, "Number of active CPUs");
|
|
|
|
SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
|
|
0, BYTE_ORDER, "System byte order");
|
|
|
|
SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
|
|
0, PAGE_SIZE, "System memory page size");
|
|
|
|
static int
|
|
sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
u_long val;
|
|
|
|
val = ctob(physmem);
|
|
return (sysctl_handle_long(oidp, &val, 0, req));
|
|
}
|
|
|
|
SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
|
|
0, 0, sysctl_hw_physmem, "LU", "");
|
|
|
|
static int
|
|
sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
u_long val;
|
|
val = ctob(realmem);
|
|
return (sysctl_handle_long(oidp, &val, 0, req));
|
|
}
|
|
SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
|
|
0, 0, sysctl_hw_realmem, "LU", "");
|
|
static int
|
|
sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
u_long val;
|
|
|
|
val = ctob(physmem - VMCNT_GET(wire_count));
|
|
return (sysctl_handle_long(oidp, &val, 0, req));
|
|
}
|
|
|
|
SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
|
|
0, 0, sysctl_hw_usermem, "LU", "");
|
|
|
|
SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
|
|
|
|
static char machine_arch[] = MACHINE_ARCH;
|
|
SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
|
|
machine_arch, 0, "System architecture");
|
|
|
|
char hostname[MAXHOSTNAMELEN];
|
|
|
|
static int
|
|
sysctl_hostname(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct prison *pr;
|
|
char tmphostname[MAXHOSTNAMELEN];
|
|
int error;
|
|
|
|
pr = req->td->td_ucred->cr_prison;
|
|
if (pr != NULL) {
|
|
if (!jail_set_hostname_allowed && req->newptr)
|
|
return (EPERM);
|
|
/*
|
|
* Process is in jail, so make a local copy of jail
|
|
* hostname to get/set so we don't have to hold the jail
|
|
* mutex during the sysctl copyin/copyout activities.
|
|
*/
|
|
mtx_lock(&pr->pr_mtx);
|
|
bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
|
|
error = sysctl_handle_string(oidp, tmphostname,
|
|
sizeof pr->pr_host, req);
|
|
|
|
if (req->newptr != NULL && error == 0) {
|
|
/*
|
|
* Copy the locally set hostname to the jail, if
|
|
* appropriate.
|
|
*/
|
|
mtx_lock(&pr->pr_mtx);
|
|
bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
} else
|
|
error = sysctl_handle_string(oidp,
|
|
hostname, sizeof hostname, req);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
|
|
CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
|
|
0, 0, sysctl_hostname, "A", "Hostname");
|
|
|
|
static int regression_securelevel_nonmonotonic = 0;
|
|
|
|
#ifdef REGRESSION
|
|
SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
|
|
®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
|
|
#endif
|
|
|
|
int securelevel = -1;
|
|
static struct mtx securelevel_mtx;
|
|
|
|
MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
|
|
MTX_DEF);
|
|
|
|
static int
|
|
sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct prison *pr;
|
|
int error, level;
|
|
|
|
pr = req->td->td_ucred->cr_prison;
|
|
|
|
/*
|
|
* If the process is in jail, return the maximum of the global and
|
|
* local levels; otherwise, return the global level. Perform a
|
|
* lockless read since the securelevel is an integer.
|
|
*/
|
|
if (pr != NULL)
|
|
level = imax(securelevel, pr->pr_securelevel);
|
|
else
|
|
level = securelevel;
|
|
error = sysctl_handle_int(oidp, &level, 0, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
/*
|
|
* Permit update only if the new securelevel exceeds the
|
|
* global level, and local level if any.
|
|
*/
|
|
if (pr != NULL) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (!regression_securelevel_nonmonotonic &&
|
|
(level < imax(securelevel, pr->pr_securelevel))) {
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return (EPERM);
|
|
}
|
|
pr->pr_securelevel = level;
|
|
mtx_unlock(&pr->pr_mtx);
|
|
} else {
|
|
mtx_lock(&securelevel_mtx);
|
|
if (!regression_securelevel_nonmonotonic &&
|
|
(level < securelevel)) {
|
|
mtx_unlock(&securelevel_mtx);
|
|
return (EPERM);
|
|
}
|
|
securelevel = level;
|
|
mtx_unlock(&securelevel_mtx);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
|
|
CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
|
|
"I", "Current secure level");
|
|
|
|
#ifdef INCLUDE_CONFIG_FILE
|
|
/* Actual kernel configuration options. */
|
|
extern char kernconfstring[];
|
|
|
|
static int
|
|
sysctl_kern_config(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf *sb;
|
|
int error;
|
|
char *p;
|
|
|
|
sb = sbuf_new(NULL, NULL, 2048, SBUF_AUTOEXTEND);
|
|
if (sb == NULL)
|
|
return (ENOMEM);
|
|
sbuf_clear(sb);
|
|
p = kernconfstring;
|
|
if (p == NULL || *p == '\0') {
|
|
sbuf_printf(sb, "No kernel configuration\n");
|
|
} else {
|
|
sbuf_printf(sb, "%s", p);
|
|
}
|
|
sbuf_trim(sb);
|
|
sbuf_putc(sb, '\n');
|
|
sbuf_finish(sb);
|
|
error = sysctl_handle_string(oidp, sbuf_data(sb), sbuf_len(sb), req);
|
|
if (error)
|
|
return (error);
|
|
sbuf_delete(sb);
|
|
return (error);
|
|
}
|
|
SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW,
|
|
0, 0, sysctl_kern_config, "", "Kernel configuration file");
|
|
#endif
|
|
|
|
char domainname[MAXHOSTNAMELEN];
|
|
SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
|
|
&domainname, sizeof(domainname), "Name of the current YP/NIS domain");
|
|
|
|
u_long hostid;
|
|
SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
|
|
char hostuuid[64] = "00000000-0000-0000-0000-000000000000";
|
|
SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid,
|
|
sizeof(hostuuid), "Host UUID");
|
|
|
|
/*
|
|
* This is really cheating. These actually live in the libc, something
|
|
* which I'm not quite sure is a good idea anyway, but in order for
|
|
* getnext and friends to actually work, we define dummies here.
|
|
*/
|
|
SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
|
|
"", 0, "PATH that finds all the standard utilities");
|
|
SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
|
|
0, 0, "Max ibase/obase values in bc(1)");
|
|
SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
|
|
0, 0, "Max array size in bc(1)");
|
|
SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
|
|
0, 0, "Max scale value in bc(1)");
|
|
SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
|
|
0, 0, "Max string length in bc(1)");
|
|
SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
|
|
0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
|
|
SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
|
|
SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
|
|
0, 0, "Max length (bytes) of a text-processing utility's input line");
|
|
SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
|
|
0, 0, "Maximum number of repeats of a regexp permitted");
|
|
SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
|
|
0, 0,
|
|
"The version of POSIX 1003.2 with which the system attempts to comply");
|
|
SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
|
|
0, 0, "Whether C development supports the C bindings option");
|
|
SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
|
|
0, 0, "Whether system supports the C development utilities option");
|
|
SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
|
|
0, 0, "");
|
|
SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
|
|
0, 0, "Whether system supports FORTRAN development utilities");
|
|
SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
|
|
0, 0, "Whether system supports FORTRAN runtime utilities");
|
|
SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
|
|
0, 0, "Whether system supports creation of locales");
|
|
SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
|
|
0, 0, "Whether system supports software development utilities");
|
|
SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
|
|
0, 0, "Whether system supports the user portability utilities");
|
|
SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
|
|
0, 0, "Min Maximum number of streams a process may have open at one time");
|
|
SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
|
|
0, 0, "Min Maximum number of types supported for timezone names");
|
|
|
|
#include <sys/vnode.h>
|
|
SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
|
|
0, sizeof(struct vnode), "sizeof(struct vnode)");
|
|
|
|
SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
|
|
0, sizeof(struct proc), "sizeof(struct proc)");
|
|
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
|
|
0, sizeof(struct bio), "sizeof(struct bio)");
|
|
SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
|
|
0, sizeof(struct buf), "sizeof(struct buf)");
|
|
|
|
#include <sys/user.h>
|
|
SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
|
|
0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
|
|
|
|
/* XXX compatibility, remove for 6.0 */
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_elf.h>
|
|
SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
|
|
&__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
|
|
"compatibility for kern.fallback_elf_brand");
|