The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mib.c

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    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. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      @(#)kern_sysctl.c       8.4 (Berkeley) 4/14/94
   40  * $FreeBSD: releng/5.0/sys/kern/kern_mib.c 106605 2002-11-07 23:57:17Z tmm $
   41  */
   42 
   43 #include "opt_posix.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/systm.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/proc.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/jail.h>
   53 #include <sys/smp.h>
   54 #include <sys/unistd.h>
   55 
   56 SYSCTL_NODE(, 0,          sysctl, CTLFLAG_RW, 0,
   57         "Sysctl internal magic");
   58 SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
   59         "High kernel, proc, limits &c");
   60 SYSCTL_NODE(, CTL_VM,     vm,     CTLFLAG_RW, 0,
   61         "Virtual memory");
   62 SYSCTL_NODE(, CTL_VFS,    vfs,     CTLFLAG_RW, 0,
   63         "File system");
   64 SYSCTL_NODE(, CTL_NET,    net,    CTLFLAG_RW, 0,
   65         "Network, (see socket.h)");
   66 SYSCTL_NODE(, CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
   67         "Debugging");
   68 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
   69         "Sizeof various things");
   70 SYSCTL_NODE(, CTL_HW,     hw,     CTLFLAG_RW, 0,
   71         "hardware");
   72 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
   73         "machine dependent");
   74 SYSCTL_NODE(, CTL_USER,   user,   CTLFLAG_RW, 0,
   75         "user-level");
   76 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
   77         "p1003_1b, (see p1003_1b.h)");
   78 
   79 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
   80         "Compatibility code");
   81 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 
   82         "Security");
   83 #ifdef REGRESSION
   84 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
   85      "Regression test MIB");
   86 #endif
   87 
   88 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
   89     osrelease, 0, "Operating system release");
   90 
   91 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
   92     0, BSD, "Operating system revision");
   93 
   94 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
   95     version, 0, "Kernel version");
   96 
   97 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
   98     ostype, 0, "Operating system type");
   99 
  100 extern int osreldate;
  101 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
  102     &osreldate, 0, "Operating system release date");
  103 
  104 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD,
  105     &maxproc, 0, "Maximum number of processes");
  106 
  107 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
  108     &maxprocperuid, 0, "Maximum processes allowed per userid");
  109 
  110 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD,
  111     &maxusers, 0, "Hint for kernel tuning");
  112 
  113 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
  114     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
  115 
  116 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
  117     0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
  118 
  119 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
  120     0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
  121 
  122 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
  123     0, 1, "Whether job control is available");
  124 
  125 #ifdef _POSIX_SAVED_IDS
  126 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
  127     0, 1, "Whether saved set-group/user ID is available");
  128 #else
  129 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
  130     0, 0, "Whether saved set-group/user ID is available");
  131 #endif
  132 
  133 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
  134 
  135 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
  136     kernelname, sizeof kernelname, "Name of kernel file booted");
  137 
  138 #ifdef SMP
  139 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
  140     &mp_ncpus, 0, "Number of active CPUs");
  141 #else
  142 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
  143     0, 1, "Number of active CPUs");
  144 #endif
  145 
  146 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
  147     0, BYTE_ORDER, "System byte order");
  148 
  149 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
  150     0, PAGE_SIZE, "System memory page size");
  151 
  152 static int
  153 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
  154 {
  155         u_long val;
  156 
  157         val = ctob(physmem);
  158         return (sysctl_handle_long(oidp, &val, 0, req));
  159 }
  160 
  161 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
  162         0, 0, sysctl_hw_physmem, "LU", "");
  163 
  164 static int
  165 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
  166 {
  167         u_long val;
  168 
  169         val = ctob(physmem - cnt.v_wire_count);
  170         return (sysctl_handle_long(oidp, &val, 0, req));
  171 }
  172 
  173 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
  174         0, 0, sysctl_hw_usermem, "LU", "");
  175 
  176 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
  177 
  178 static char     machine_arch[] = MACHINE_ARCH;
  179 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
  180     machine_arch, 0, "System architecture");
  181 
  182 char hostname[MAXHOSTNAMELEN];
  183 
  184 static int
  185 sysctl_hostname(SYSCTL_HANDLER_ARGS)
  186 {
  187         struct prison *pr;
  188         char tmphostname[MAXHOSTNAMELEN];
  189         int error;
  190 
  191         pr = req->td->td_ucred->cr_prison;
  192         if (pr != NULL) {
  193                 if (!jail_set_hostname_allowed && req->newptr)
  194                         return (EPERM);
  195                 /*
  196                  * Process is in jail, so make a local copy of jail
  197                  * hostname to get/set so we don't have to hold the jail
  198                  * mutex during the sysctl copyin/copyout activities.
  199                  */
  200                 mtx_lock(&pr->pr_mtx);
  201                 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
  202                 mtx_unlock(&pr->pr_mtx);
  203 
  204                 error = sysctl_handle_string(oidp, tmphostname,
  205                     sizeof pr->pr_host, req);
  206 
  207                 if (req->newptr != NULL && error == 0) {
  208                         /*
  209                          * Copy the locally set hostname to the jail, if
  210                          * appropriate.
  211                          */
  212                         mtx_lock(&pr->pr_mtx);
  213                         bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
  214                         mtx_unlock(&pr->pr_mtx);
  215                 }
  216         } else
  217                 error = sysctl_handle_string(oidp,
  218                     hostname, sizeof hostname, req);
  219         return (error);
  220 }
  221 
  222 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
  223        CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
  224        0, 0, sysctl_hostname, "A", "Hostname");
  225 
  226 static int      regression_securelevel_nonmonotonic = 0;
  227 
  228 #ifdef REGRESSION
  229 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
  230     &regression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
  231 #endif
  232 
  233 int securelevel = -1;
  234 struct mtx securelevel_mtx;
  235 
  236 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
  237     MTX_DEF);
  238 
  239 static int
  240 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
  241 {
  242         struct prison *pr;
  243         int error, level;
  244 
  245         pr = req->td->td_ucred->cr_prison;
  246 
  247         /*
  248          * If the process is in jail, return the maximum of the global and
  249          * local levels; otherwise, return the global level.
  250          */
  251         if (pr != NULL) {
  252                 mtx_lock(&pr->pr_mtx);
  253                 level = imax(securelevel, pr->pr_securelevel);
  254                 mtx_unlock(&pr->pr_mtx);
  255         } else
  256                 level = securelevel;
  257         error = sysctl_handle_int(oidp, &level, 0, req);
  258         if (error || !req->newptr)
  259                 return (error);
  260         /*
  261          * Permit update only if the new securelevel exceeds the
  262          * global level, and local level if any.
  263          */
  264         if (pr != NULL) {
  265                 mtx_lock(&pr->pr_mtx);
  266                 if (!regression_securelevel_nonmonotonic &&
  267                     (level < imax(securelevel, pr->pr_securelevel))) {
  268                         mtx_unlock(&pr->pr_mtx);
  269                         return (EPERM);
  270                 }
  271                 pr->pr_securelevel = level;
  272                 mtx_unlock(&pr->pr_mtx);
  273         } else {
  274                 mtx_lock(&securelevel_mtx);
  275                 if (!regression_securelevel_nonmonotonic &&
  276                     (level < securelevel)) {
  277                         mtx_unlock(&securelevel_mtx);
  278                         return (EPERM);
  279                 }
  280                 securelevel = level;
  281                 mtx_unlock(&securelevel_mtx);
  282         }
  283         return (error);
  284 }
  285 
  286 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
  287     CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
  288     "I", "Current secure level");
  289 
  290 char domainname[MAXHOSTNAMELEN];
  291 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
  292     &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
  293 
  294 u_long hostid;
  295 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
  296 
  297 /*
  298  * This is really cheating.  These actually live in the libc, something
  299  * which I'm not quite sure is a good idea anyway, but in order for
  300  * getnext and friends to actually work, we define dummies here.
  301  */
  302 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
  303     "", 0, "PATH that finds all the standard utilities");
  304 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
  305     0, 0, "Max ibase/obase values in bc(1)");
  306 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
  307     0, 0, "Max array size in bc(1)");
  308 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
  309     0, 0, "Max scale value in bc(1)");
  310 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
  311     0, 0, "Max string length in bc(1)");
  312 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
  313     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
  314 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
  315 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
  316     0, 0, "Max length (bytes) of a text-processing utility's input line");
  317 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
  318     0, 0, "Maximum number of repeats of a regexp permitted");
  319 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
  320     0, 0,
  321     "The version of POSIX 1003.2 with which the system attempts to comply");
  322 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
  323     0, 0, "Whether C development supports the C bindings option");
  324 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
  325     0, 0, "Whether system supports the C development utilities option");
  326 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
  327     0, 0, "");
  328 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
  329     0, 0, "Whether system supports FORTRAN development utilities");
  330 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
  331     0, 0, "Whether system supports FORTRAN runtime utilities");
  332 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
  333     0, 0, "Whether system supports creation of locales");
  334 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
  335     0, 0, "Whether system supports software development utilities");
  336 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
  337     0, 0, "Whether system supports the user portability utilities");
  338 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
  339     0, 0, "Min Maximum number of streams a process may have open at one time");
  340 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
  341     0, 0, "Min Maximum number of types supported for timezone names");
  342 
  343 #include <sys/vnode.h>
  344 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
  345     0, sizeof(struct vnode), "sizeof(struct vnode)");
  346 
  347 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
  348     0, sizeof(struct proc), "sizeof(struct proc)");
  349 
  350 #include <sys/conf.h>
  351 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
  352     0, sizeof(struct cdev), "sizeof(struct cdev)");
  353 
  354 #include <sys/bio.h>
  355 #include <sys/buf.h>
  356 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
  357     0, sizeof(struct bio), "sizeof(struct bio)");
  358 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
  359     0, sizeof(struct buf), "sizeof(struct buf)");
  360 
  361 #include <sys/user.h>
  362 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
  363     0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");

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