184dcdc7c8
from CTLFLAG_RD to CTLFLAG_RDTUN so that sysctl(8) can provide more useful error messages.
380 lines
13 KiB
C
380 lines
13 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Karels at Berkeley Software Design, Inc.
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*
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* Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
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* project, to make these variables more userfriendly.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_posix.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/jail.h>
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#include <sys/smp.h>
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#include <sys/unistd.h>
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SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
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"Sysctl internal magic");
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SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
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"High kernel, proc, limits &c");
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SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
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"Virtual memory");
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SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0,
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"File system");
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SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
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"Network, (see socket.h)");
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SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
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"Debugging");
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SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0,
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"Sizeof various things");
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SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
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"hardware");
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SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
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"machine dependent");
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SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
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"user-level");
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SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0,
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"p1003_1b, (see p1003_1b.h)");
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SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0,
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"Compatibility code");
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SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0,
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"Security");
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#ifdef REGRESSION
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SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
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"Regression test MIB");
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#endif
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SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
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kern_ident, 0, "Kernel identifier");
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SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
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osrelease, 0, "Operating system release");
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SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
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0, BSD, "Operating system revision");
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SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
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version, 0, "Kernel version");
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SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
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ostype, 0, "Operating system type");
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/*
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* NOTICE: The *userland* release date is available in
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* /usr/include/osreldate.h
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*/
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extern int osreldate;
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SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
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&osreldate, 0, "Kernel release date");
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SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
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&maxproc, 0, "Maximum number of processes");
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SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
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&maxprocperuid, 0, "Maximum processes allowed per userid");
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SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
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&maxusers, 0, "Hint for kernel tuning");
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SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
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0, ARG_MAX, "Maximum bytes of argument to execve(2)");
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SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
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0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
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SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
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0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
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SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
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0, 1, "Whether job control is available");
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#ifdef _POSIX_SAVED_IDS
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SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
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0, 1, "Whether saved set-group/user ID is available");
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#else
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SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
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0, 0, "Whether saved set-group/user ID is available");
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#endif
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char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
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SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
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kernelname, sizeof kernelname, "Name of kernel file booted");
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#ifdef SMP
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SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
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&mp_ncpus, 0, "Number of active CPUs");
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#else
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SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
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0, 1, "Number of active CPUs");
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#endif
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SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
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0, BYTE_ORDER, "System byte order");
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SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
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0, PAGE_SIZE, "System memory page size");
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static int
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sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
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{
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u_long val;
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val = ctob(physmem);
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return (sysctl_handle_long(oidp, &val, 0, req));
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}
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SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
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0, 0, sysctl_hw_physmem, "LU", "");
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static int
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sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
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{
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u_long val;
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val = ctob(physmem - cnt.v_wire_count);
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return (sysctl_handle_long(oidp, &val, 0, req));
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}
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SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
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0, 0, sysctl_hw_usermem, "LU", "");
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SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
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static char machine_arch[] = MACHINE_ARCH;
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SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
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machine_arch, 0, "System architecture");
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char hostname[MAXHOSTNAMELEN];
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static int
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sysctl_hostname(SYSCTL_HANDLER_ARGS)
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{
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struct prison *pr;
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char tmphostname[MAXHOSTNAMELEN];
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int error;
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pr = req->td->td_ucred->cr_prison;
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if (pr != NULL) {
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if (!jail_set_hostname_allowed && req->newptr)
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return (EPERM);
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/*
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* Process is in jail, so make a local copy of jail
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* hostname to get/set so we don't have to hold the jail
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* mutex during the sysctl copyin/copyout activities.
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*/
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mtx_lock(&pr->pr_mtx);
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bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
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mtx_unlock(&pr->pr_mtx);
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error = sysctl_handle_string(oidp, tmphostname,
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sizeof pr->pr_host, req);
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if (req->newptr != NULL && error == 0) {
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/*
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* Copy the locally set hostname to the jail, if
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* appropriate.
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*/
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mtx_lock(&pr->pr_mtx);
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bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
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mtx_unlock(&pr->pr_mtx);
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}
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} else
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error = sysctl_handle_string(oidp,
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hostname, sizeof hostname, req);
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
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CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
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0, 0, sysctl_hostname, "A", "Hostname");
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static int regression_securelevel_nonmonotonic = 0;
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#ifdef REGRESSION
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SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
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®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
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#endif
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int securelevel = -1;
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static struct mtx securelevel_mtx;
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MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
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MTX_DEF);
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static int
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sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
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{
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struct prison *pr;
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int error, level;
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pr = req->td->td_ucred->cr_prison;
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/*
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* If the process is in jail, return the maximum of the global and
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* local levels; otherwise, return the global level.
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*/
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if (pr != NULL) {
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mtx_lock(&pr->pr_mtx);
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level = imax(securelevel, pr->pr_securelevel);
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mtx_unlock(&pr->pr_mtx);
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} else
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level = securelevel;
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error = sysctl_handle_int(oidp, &level, 0, req);
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if (error || !req->newptr)
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return (error);
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/*
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* Permit update only if the new securelevel exceeds the
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* global level, and local level if any.
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*/
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if (pr != NULL) {
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mtx_lock(&pr->pr_mtx);
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if (!regression_securelevel_nonmonotonic &&
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(level < imax(securelevel, pr->pr_securelevel))) {
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mtx_unlock(&pr->pr_mtx);
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return (EPERM);
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}
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pr->pr_securelevel = level;
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mtx_unlock(&pr->pr_mtx);
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} else {
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mtx_lock(&securelevel_mtx);
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if (!regression_securelevel_nonmonotonic &&
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(level < securelevel)) {
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mtx_unlock(&securelevel_mtx);
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return (EPERM);
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}
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securelevel = level;
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mtx_unlock(&securelevel_mtx);
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}
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
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CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
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"I", "Current secure level");
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char domainname[MAXHOSTNAMELEN];
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SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
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&domainname, sizeof(domainname), "Name of the current YP/NIS domain");
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u_long hostid;
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SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
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/*
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* This is really cheating. These actually live in the libc, something
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* which I'm not quite sure is a good idea anyway, but in order for
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* getnext and friends to actually work, we define dummies here.
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*/
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SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
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"", 0, "PATH that finds all the standard utilities");
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SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
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0, 0, "Max ibase/obase values in bc(1)");
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SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
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0, 0, "Max array size in bc(1)");
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SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
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0, 0, "Max scale value in bc(1)");
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SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
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0, 0, "Max string length in bc(1)");
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SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
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0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
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SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
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SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
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0, 0, "Max length (bytes) of a text-processing utility's input line");
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SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
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0, 0, "Maximum number of repeats of a regexp permitted");
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SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
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0, 0,
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"The version of POSIX 1003.2 with which the system attempts to comply");
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SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
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0, 0, "Whether C development supports the C bindings option");
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SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
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0, 0, "Whether system supports the C development utilities option");
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SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
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0, 0, "");
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SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
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0, 0, "Whether system supports FORTRAN development utilities");
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SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
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0, 0, "Whether system supports FORTRAN runtime utilities");
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SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
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0, 0, "Whether system supports creation of locales");
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SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
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0, 0, "Whether system supports software development utilities");
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SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
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0, 0, "Whether system supports the user portability utilities");
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SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
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0, 0, "Min Maximum number of streams a process may have open at one time");
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SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
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0, 0, "Min Maximum number of types supported for timezone names");
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#include <sys/vnode.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
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0, sizeof(struct vnode), "sizeof(struct vnode)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
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0, sizeof(struct proc), "sizeof(struct proc)");
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#include <sys/conf.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
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0, sizeof(struct cdev), "sizeof(struct cdev)");
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#include <sys/bio.h>
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#include <sys/buf.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
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0, sizeof(struct bio), "sizeof(struct bio)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
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0, sizeof(struct buf), "sizeof(struct buf)");
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#include <sys/user.h>
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SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
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0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
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/* XXX compatibility, remove for 6.0 */
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
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&__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
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"compatibility for kern.fallback_elf_brand");
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