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  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)kern_sysctl.c       8.4 (Berkeley) 4/14/94
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_compat.h"
   42 #include "opt_posix.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/systm.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/proc.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/jail.h>
   52 #include <sys/smp.h>
   53 #include <sys/unistd.h>
   54 
   55 SYSCTL_NODE(, 0,          sysctl, CTLFLAG_RW, 0,
   56         "Sysctl internal magic");
   57 SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
   58         "High kernel, proc, limits &c");
   59 SYSCTL_NODE(, CTL_VM,     vm,     CTLFLAG_RW, 0,
   60         "Virtual memory");
   61 SYSCTL_NODE(, CTL_VFS,    vfs,     CTLFLAG_RW, 0,
   62         "File system");
   63 SYSCTL_NODE(, CTL_NET,    net,    CTLFLAG_RW, 0,
   64         "Network, (see socket.h)");
   65 SYSCTL_NODE(, CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
   66         "Debugging");
   67 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
   68         "Sizeof various things");
   69 SYSCTL_NODE(, CTL_HW,     hw,     CTLFLAG_RW, 0,
   70         "hardware");
   71 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
   72         "machine dependent");
   73 SYSCTL_NODE(, CTL_USER,   user,   CTLFLAG_RW, 0,
   74         "user-level");
   75 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
   76         "p1003_1b, (see p1003_1b.h)");
   77 
   78 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
   79         "Compatibility code");
   80 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 
   81         "Security");
   82 #ifdef REGRESSION
   83 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0,
   84      "Regression test MIB");
   85 #endif
   86 
   87 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
   88     kern_ident, 0, "Kernel identifier");
   89 
   90 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD,
   91     osrelease, 0, "Operating system release");
   92 
   93 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
   94     0, BSD, "Operating system revision");
   95 
   96 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
   97     version, 0, "Kernel version");
   98 
   99 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD,
  100     ostype, 0, "Operating system type");
  101 
  102 /*
  103  * NOTICE: The *userland* release date is available in
  104  * /usr/include/osreldate.h
  105  */
  106 extern int osreldate;
  107 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
  108     &osreldate, 0, "Kernel release date");
  109 
  110 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN,
  111     &maxproc, 0, "Maximum number of processes");
  112 
  113 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
  114     &maxprocperuid, 0, "Maximum processes allowed per userid");
  115 
  116 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN,
  117     &maxusers, 0, "Hint for kernel tuning");
  118 
  119 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
  120     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
  121 
  122 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
  123     0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
  124 
  125 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
  126     0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
  127 
  128 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
  129     0, 1, "Whether job control is available");
  130 
  131 #ifdef _POSIX_SAVED_IDS
  132 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
  133     0, 1, "Whether saved set-group/user ID is available");
  134 #else
  135 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
  136     0, 0, "Whether saved set-group/user ID is available");
  137 #endif
  138 
  139 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
  140 
  141 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
  142     kernelname, sizeof kernelname, "Name of kernel file booted");
  143 
  144 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
  145     &mp_ncpus, 0, "Number of active CPUs");
  146 
  147 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
  148     0, BYTE_ORDER, "System byte order");
  149 
  150 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
  151     0, PAGE_SIZE, "System memory page size");
  152 
  153 static int
  154 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
  155 {
  156         u_long val;
  157 
  158         val = ctob(physmem);
  159         return (sysctl_handle_long(oidp, &val, 0, req));
  160 }
  161 
  162 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD,
  163         0, 0, sysctl_hw_physmem, "LU", "");
  164 
  165 static int
  166 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS)
  167 {
  168         u_long val;
  169         val = ctob(realmem);
  170         return (sysctl_handle_long(oidp, &val, 0, req));
  171 }
  172 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD,
  173         0, 0, sysctl_hw_realmem, "LU", "");
  174 static int
  175 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
  176 {
  177         u_long val;
  178 
  179         val = ctob(physmem - cnt.v_wire_count);
  180         return (sysctl_handle_long(oidp, &val, 0, req));
  181 }
  182 
  183 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD,
  184         0, 0, sysctl_hw_usermem, "LU", "");
  185 
  186 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, "");
  187 
  188 static char     machine_arch[] = MACHINE_ARCH;
  189 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD,
  190     machine_arch, 0, "System architecture");
  191 
  192 char hostname[MAXHOSTNAMELEN];
  193 
  194 static int
  195 sysctl_hostname(SYSCTL_HANDLER_ARGS)
  196 {
  197         struct prison *pr;
  198         char tmphostname[MAXHOSTNAMELEN];
  199         int error;
  200 
  201         pr = req->td->td_ucred->cr_prison;
  202         if (pr != NULL) {
  203                 if (!jail_set_hostname_allowed && req->newptr)
  204                         return (EPERM);
  205                 /*
  206                  * Process is in jail, so make a local copy of jail
  207                  * hostname to get/set so we don't have to hold the jail
  208                  * mutex during the sysctl copyin/copyout activities.
  209                  */
  210                 mtx_lock(&pr->pr_mtx);
  211                 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN);
  212                 mtx_unlock(&pr->pr_mtx);
  213 
  214                 error = sysctl_handle_string(oidp, tmphostname,
  215                     sizeof pr->pr_host, req);
  216 
  217                 if (req->newptr != NULL && error == 0) {
  218                         /*
  219                          * Copy the locally set hostname to the jail, if
  220                          * appropriate.
  221                          */
  222                         mtx_lock(&pr->pr_mtx);
  223                         bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN);
  224                         mtx_unlock(&pr->pr_mtx);
  225                 }
  226         } else
  227                 error = sysctl_handle_string(oidp,
  228                     hostname, sizeof hostname, req);
  229         return (error);
  230 }
  231 
  232 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
  233        CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON,
  234        0, 0, sysctl_hostname, "A", "Hostname");
  235 
  236 static int      regression_securelevel_nonmonotonic = 0;
  237 
  238 #ifdef REGRESSION
  239 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW,
  240     &regression_securelevel_nonmonotonic, 0, "securelevel may be lowered");
  241 #endif
  242 
  243 int securelevel = -1;
  244 static struct mtx securelevel_mtx;
  245 
  246 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock",
  247     MTX_DEF);
  248 
  249 static int
  250 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
  251 {
  252         struct prison *pr;
  253         int error, level;
  254 
  255         pr = req->td->td_ucred->cr_prison;
  256 
  257         /*
  258          * If the process is in jail, return the maximum of the global and
  259          * local levels; otherwise, return the global level.  Perform a
  260          * lockless read since the securelevel is an integer.
  261          */
  262         if (pr != NULL)
  263                 level = imax(securelevel, pr->pr_securelevel);
  264         else
  265                 level = securelevel;
  266         error = sysctl_handle_int(oidp, &level, 0, req);
  267         if (error || !req->newptr)
  268                 return (error);
  269         /*
  270          * Permit update only if the new securelevel exceeds the
  271          * global level, and local level if any.
  272          */
  273         if (pr != NULL) {
  274                 mtx_lock(&pr->pr_mtx);
  275                 if (!regression_securelevel_nonmonotonic &&
  276                     (level < imax(securelevel, pr->pr_securelevel))) {
  277                         mtx_unlock(&pr->pr_mtx);
  278                         return (EPERM);
  279                 }
  280                 pr->pr_securelevel = level;
  281                 mtx_unlock(&pr->pr_mtx);
  282         } else {
  283                 mtx_lock(&securelevel_mtx);
  284                 if (!regression_securelevel_nonmonotonic &&
  285                     (level < securelevel)) {
  286                         mtx_unlock(&securelevel_mtx);
  287                         return (EPERM);
  288                 }
  289                 securelevel = level;
  290                 mtx_unlock(&securelevel_mtx);
  291         }
  292         return (error);
  293 }
  294 
  295 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel,
  296     CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl,
  297     "I", "Current secure level");
  298 
  299 char domainname[MAXHOSTNAMELEN];
  300 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
  301     &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
  302 
  303 u_long hostid;
  304 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
  305 
  306 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features");
  307 
  308 #ifdef COMPAT_FREEBSD4
  309 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4");
  310 #endif
  311 
  312 #ifdef COMPAT_FREEBSD5
  313 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5");
  314 #endif
  315 
  316 /*
  317  * This is really cheating.  These actually live in the libc, something
  318  * which I'm not quite sure is a good idea anyway, but in order for
  319  * getnext and friends to actually work, we define dummies here.
  320  */
  321 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
  322     "", 0, "PATH that finds all the standard utilities");
  323 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
  324     0, 0, "Max ibase/obase values in bc(1)");
  325 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
  326     0, 0, "Max array size in bc(1)");
  327 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
  328     0, 0, "Max scale value in bc(1)");
  329 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
  330     0, 0, "Max string length in bc(1)");
  331 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
  332     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
  333 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
  334 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
  335     0, 0, "Max length (bytes) of a text-processing utility's input line");
  336 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
  337     0, 0, "Maximum number of repeats of a regexp permitted");
  338 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
  339     0, 0,
  340     "The version of POSIX 1003.2 with which the system attempts to comply");
  341 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
  342     0, 0, "Whether C development supports the C bindings option");
  343 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
  344     0, 0, "Whether system supports the C development utilities option");
  345 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
  346     0, 0, "");
  347 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
  348     0, 0, "Whether system supports FORTRAN development utilities");
  349 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
  350     0, 0, "Whether system supports FORTRAN runtime utilities");
  351 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
  352     0, 0, "Whether system supports creation of locales");
  353 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
  354     0, 0, "Whether system supports software development utilities");
  355 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
  356     0, 0, "Whether system supports the user portability utilities");
  357 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
  358     0, 0, "Min Maximum number of streams a process may have open at one time");
  359 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
  360     0, 0, "Min Maximum number of types supported for timezone names");
  361 
  362 #include <sys/vnode.h>
  363 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
  364     0, sizeof(struct vnode), "sizeof(struct vnode)");
  365 
  366 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
  367     0, sizeof(struct proc), "sizeof(struct proc)");
  368 
  369 #include <sys/bio.h>
  370 #include <sys/buf.h>
  371 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD,
  372     0, sizeof(struct bio), "sizeof(struct bio)");
  373 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD,
  374     0, sizeof(struct buf), "sizeof(struct buf)");
  375 
  376 #include <sys/user.h>
  377 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD,
  378     0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)");
  379 
  380 /* XXX compatibility, remove for 6.0 */
  381 #include <sys/imgact.h>
  382 #include <sys/imgact_elf.h>
  383 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
  384     &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)),
  385     "compatibility for kern.fallback_elf_brand");

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