sys/kern/kern_mib.c

   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. 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  * $FreeBSD: src/sys/kern/kern_mib.c,v 1.29.2.4 2001/07/30 23:28:00 peter Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/kernel.h>
  41 #include <sys/systm.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/proc.h>
  44 #include <sys/lockf.h>
  45 #include <sys/jail.h>
  46 #include <sys/unistd.h>
  47 #include <machine/smp.h>
  48
  49 SYSCTL_NODE(, 0,          sysctl, CTLFLAG_RW, 0,
  50         "Sysctl internal magic");
  51 SYSCTL_NODE(, CTL_KERN,   kern,   CTLFLAG_RW, 0,
  52         "High kernel, proc, limits &c");
  53 SYSCTL_NODE(, CTL_VM,     vm,     CTLFLAG_RW, 0,
  54         "Virtual memory");
  55 SYSCTL_NODE(, CTL_VFS,    vfs,     CTLFLAG_RW, 0,
  56         "File system");
  57 SYSCTL_NODE(, CTL_NET,    net,    CTLFLAG_RW, 0,
  58         "Network, (see socket.h)");
  59 SYSCTL_NODE(, CTL_DEBUG,  debug,  CTLFLAG_RW, 0,
  60         "Debugging");
  61 SYSCTL_NODE(_debug, OID_AUTO,  sizeof,  CTLFLAG_RW, 0,
  62         "Size of various kernel data structures");
  63 SYSCTL_NODE(, CTL_HW,     hw,     CTLFLAG_RW, 0,
  64         "hardware");
  65 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
  66         "machine dependent");
  67 SYSCTL_NODE(, CTL_USER,   user,   CTLFLAG_RW, 0,
  68         "user-level");
  69 SYSCTL_NODE(, CTL_P1003_1B,  p1003_1b,   CTLFLAG_RW, 0,
  70         "p1003_1b, (see p1003_1b.h)");
  71 SYSCTL_NODE(, CTL_LWKT,  lwkt,   CTLFLAG_RW, 0,
  72         "light weight kernel threads");
  73
  74 SYSCTL_NODE(, OID_AUTO,  compat, CTLFLAG_RW, 0,
  75         "Compatibility code");
  76 SYSCTL_NODE(, OID_AUTO,  security,   CTLFLAG_RW, 0,
  77         "Security");
  78
  79 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD | CTLFLAG_NOLOCK,
  80     kern_ident, 0, "Kernel identifier");
  81
  82 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD | CTLFLAG_NOLOCK,
  83     osrelease, 0, "Operating system type");
  84
  85 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD,
  86     0, BSD, "Operating system revision");
  87
  88 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD | CTLFLAG_NOLOCK,
  89     version, 0, "Kernel version");
  90
  91 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_NOLOCK,
  92     ostype, 0, "Operating system type");
  93
  94 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD,
  95     &osreldate, 0, "Operating system release date");
  96
  97 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD,
  98     &maxproc, 0, "Maximum number of processes");
  99
 100 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW,
 101     &maxprocperuid, 0, "Maximum processes allowed per userid");
 102
 103 SYSCTL_INT(_kern, KERN_MAXPOSIXLOCKSPERUID, maxposixlocksperuid, CTLFLAG_RW,
 104     &maxposixlocksperuid, 0, "Maximum number of POSIX-type locks per user id");
 105
 106 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD,
 107     &maxusers, 0, "Hint for kernel tuning");
 108
 109 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD,
 110     0, ARG_MAX, "Maximum bytes of argument to execve(2)");
 111
 112 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD,
 113     0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
 114
 115 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD,
 116     0, NGROUPS_MAX, "Maximum number of groups a user can belong to");
 117
 118 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD,
 119     0, 1, "Whether job control is available");
 120
 121 #ifdef _POSIX_SAVED_IDS
 122 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
 123     0, 1, "Whether saved set-group/user ID is available");
 124 #else
 125 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD,
 126     0, 0, "Whether saved set-group/user ID is available");
 127 #endif
 128
 129 char kernelname[MAXPATHLEN] = "/kernel";        /* XXX bloat */
 130
 131 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW,
 132     kernelname, sizeof kernelname, "Name of kernel file booted");
 133
 134 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD,
 135     &ncpus, 0, "Number of active CPUs");
 136
 137 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
 138     0, BYTE_ORDER, "System byte order");
 139
 140 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
 141     0, PAGE_SIZE, "System memory page size");
 142
 143 static char     platform[] = MACHINE_PLATFORM;
 144 SYSCTL_STRING(_hw, HW_MACHINE_PLATFORM, platform, CTLFLAG_RD | CTLFLAG_NOLOCK,
 145     platform, 0, "Platform architecture");
 146
 147 static char     machine_arch[] = MACHINE_ARCH;
 148 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD | CTLFLAG_NOLOCK,
 149     machine_arch, 0, "Cpu architecture");
 150
 151 char hostname[MAXHOSTNAMELEN];
 152
 153 /*
 154  * Hostname sysctl handler.  We use CTLFLAG_NOLOCK to avoid acquiring
 155  * the per-oid lock.  The per-cpu SLOCK is still acquired, so to interlock
 156  * against setting the hostname we relock with XLOCK.  The result is
 157  * that the critical path (just reading the hostname) gets one less lock
 158  * and will have improved performance.
 159  */
 160 static int
 161 sysctl_hostname(SYSCTL_HANDLER_ARGS)
 162 {
 163         struct thread *td = req->td;
 164         struct proc *p = td ? td->td_proc : NULL;
 165         int error;
 166
 167         if (req->newptr) {
 168                 SYSCTL_SUNLOCK();
 169                 SYSCTL_XLOCK();
 170         }
 171         if (p && p->p_ucred->cr_prison) {
 172                 if (!jail_set_hostname_allowed && req->newptr)
 173                         return(EPERM);
 174                 error = sysctl_handle_string(oidp,
 175                     p->p_ucred->cr_prison->pr_host,
 176                     sizeof p->p_ucred->cr_prison->pr_host, req);
 177         } else {
 178                 error = sysctl_handle_string(oidp,
 179                     hostname, sizeof hostname, req);
 180         }
 181         if (req->newptr) {
 182                 SYSCTL_XUNLOCK();
 183                 SYSCTL_SLOCK();
 184         }
 185         return (error);
 186 }
 187
 188 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname,
 189        CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NOLOCK,
 190        0, 0, sysctl_hostname, "A", "Hostname");
 191
 192 int securelevel = -1;
 193 int kernel_mem_readonly = 0;
 194
 195 static int
 196 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS)
 197 {
 198                 int error, level;
 199
 200                 level = securelevel;
 201                 error = sysctl_handle_int(oidp, &level, 0, req);
 202                 if (error || !req->newptr)
 203                         return (error);
 204                 if (level < securelevel)
 205                         return (EPERM);
 206                 securelevel = level;
 207                 return (error);
 208 }
 209
 210 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
 211     0, 0, sysctl_kern_securelvl, "I", "Current secure level");
 212
 213 char domainname[MAXHOSTNAMELEN];
 214 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
 215     &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
 216
 217 unsigned long hostid;
 218 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID");
 219
 220 /*
 221  * This is really cheating.  These actually live in the libc, something
 222  * which I'm not quite sure is a good idea anyway, but in order for
 223  * getnext and friends to actually work, we define dummies here.
 224  */
 225 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD,
 226     "", 0, "PATH that finds all the standard utilities");
 227 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD,
 228     0, 0, "Max ibase/obase values in bc(1)");
 229 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD,
 230     0, 0, "Max array size in bc(1)");
 231 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD,
 232     0, 0, "Max scale value in bc(1)");
 233 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD,
 234     0, 0, "Max string length in bc(1)");
 235 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD,
 236     0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry");
 237 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, "");
 238 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD,
 239     0, 0, "Max length (bytes) of a text-processing utility's input line");
 240 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD,
 241     0, 0, "Maximum number of repeats of a regexp permitted");
 242 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD,
 243     0, 0,
 244     "The version of POSIX 1003.2 with which the system attempts to comply");
 245 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD,
 246     0, 0, "Whether C development supports the C bindings option");
 247 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD,
 248     0, 0, "Whether system supports the C development utilities option");
 249 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD,
 250     0, 0, "");
 251 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD,
 252     0, 0, "Whether system supports FORTRAN development utilities");
 253 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD,
 254     0, 0, "Whether system supports FORTRAN runtime utilities");
 255 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD,
 256     0, 0, "Whether system supports creation of locales");
 257 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD,
 258     0, 0, "Whether system supports software development utilities");
 259 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD,
 260     0, 0, "Whether system supports the user portability utilities");
 261 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD,
 262     0, 0, "Min Maximum number of streams a process may have open at one time");
 263 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD,
 264     0, 0, "Min Maximum number of types supported for timezone names");
 265
 266 #include <sys/vnode.h>
 267 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD,
 268     0, sizeof(struct vnode), "sizeof(struct vnode)");
 269
 270 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD,
 271     0, sizeof(struct proc), "sizeof(struct proc)");
 272
 273 #include <sys/conf.h>
 274 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD,
 275     0, sizeof(struct cdev), "sizeof(struct cdev)");