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
Version:
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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 #include "opt_config.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/sbuf.h> 48 #include <sys/systm.h> 49 #include <sys/sysctl.h> 50 #include <sys/proc.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/jail.h> 54 #include <sys/smp.h> 55 #include <sys/unistd.h> 56 57 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 58 "Sysctl internal magic"); 59 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 60 "High kernel, proc, limits &c"); 61 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 62 "Virtual memory"); 63 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 64 "File system"); 65 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 66 "Network, (see socket.h)"); 67 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 68 "Debugging"); 69 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 70 "Sizeof various things"); 71 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 72 "hardware"); 73 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 74 "machine dependent"); 75 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 76 "user-level"); 77 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 78 "p1003_1b, (see p1003_1b.h)"); 79 80 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 81 "Compatibility code"); 82 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 83 "Security"); 84 #ifdef REGRESSION 85 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 86 "Regression test MIB"); 87 #endif 88 89 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 90 kern_ident, 0, "Kernel identifier"); 91 92 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE, 93 osrelease, 0, "Operating system release"); 94 95 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 96 0, BSD, "Operating system revision"); 97 98 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 99 version, 0, "Kernel version"); 100 101 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE, 102 ostype, 0, "Operating system type"); 103 104 /* 105 * NOTICE: The *userland* release date is available in 106 * /usr/include/osreldate.h 107 */ 108 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 109 &osreldate, 0, "Kernel release date"); 110 111 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN, 112 &maxproc, 0, "Maximum number of processes"); 113 114 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 115 &maxprocperuid, 0, "Maximum processes allowed per userid"); 116 117 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN, 118 &maxusers, 0, "Hint for kernel tuning"); 119 120 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 121 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 122 123 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 124 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 125 126 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 127 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 128 129 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 130 0, 1, "Whether job control is available"); 131 132 #ifdef _POSIX_SAVED_IDS 133 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 134 0, 1, "Whether saved set-group/user ID is available"); 135 #else 136 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 137 0, 0, "Whether saved set-group/user ID is available"); 138 #endif 139 140 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 141 142 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 143 kernelname, sizeof kernelname, "Name of kernel file booted"); 144 145 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 146 &mp_ncpus, 0, "Number of active CPUs"); 147 148 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 149 0, BYTE_ORDER, "System byte order"); 150 151 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 152 0, PAGE_SIZE, "System memory page size"); 153 154 static int 155 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 156 { 157 char buf[256]; 158 size_t len; 159 160 len = req->oldlen; 161 if (len > sizeof(buf)) 162 len = sizeof(buf); 163 arc4rand(buf, len, 0); 164 return (SYSCTL_OUT(req, buf, len)); 165 } 166 167 SYSCTL_PROC(_kern, KERN_ARND, arandom, 168 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 169 sysctl_kern_arnd, "", "arc4rand"); 170 171 static int 172 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 173 { 174 u_long val; 175 176 val = ctob(physmem); 177 return (sysctl_handle_long(oidp, &val, 0, req)); 178 } 179 180 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 181 0, 0, sysctl_hw_physmem, "LU", ""); 182 183 static int 184 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 185 { 186 u_long val; 187 val = ctob(realmem); 188 return (sysctl_handle_long(oidp, &val, 0, req)); 189 } 190 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 191 0, 0, sysctl_hw_realmem, "LU", ""); 192 static int 193 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 194 { 195 u_long val; 196 197 val = ctob(physmem - cnt.v_wire_count); 198 return (sysctl_handle_long(oidp, &val, 0, req)); 199 } 200 201 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 202 0, 0, sysctl_hw_usermem, "LU", ""); 203 204 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 205 206 static char machine_arch[] = MACHINE_ARCH; 207 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 208 machine_arch, 0, "System architecture"); 209 210 char hostname[MAXHOSTNAMELEN]; 211 212 static int 213 sysctl_hostname(SYSCTL_HANDLER_ARGS) 214 { 215 struct prison *pr; 216 char tmphostname[MAXHOSTNAMELEN]; 217 int error; 218 219 pr = req->td->td_ucred->cr_prison; 220 if (pr != NULL) { 221 if (!jail_set_hostname_allowed && req->newptr) 222 return (EPERM); 223 /* 224 * Process is in jail, so make a local copy of jail 225 * hostname to get/set so we don't have to hold the jail 226 * mutex during the sysctl copyin/copyout activities. 227 */ 228 mtx_lock(&pr->pr_mtx); 229 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 230 mtx_unlock(&pr->pr_mtx); 231 232 error = sysctl_handle_string(oidp, tmphostname, 233 sizeof pr->pr_host, req); 234 235 if (req->newptr != NULL && error == 0) { 236 /* 237 * Copy the locally set hostname to the jail, if 238 * appropriate. 239 */ 240 mtx_lock(&pr->pr_mtx); 241 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 242 mtx_unlock(&pr->pr_mtx); 243 } 244 } else 245 error = sysctl_handle_string(oidp, 246 hostname, sizeof hostname, req); 247 return (error); 248 } 249 250 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 251 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON|CTLFLAG_MPSAFE, 252 0, 0, sysctl_hostname, "A", "Hostname"); 253 254 static int regression_securelevel_nonmonotonic = 0; 255 256 #ifdef REGRESSION 257 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 258 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 259 #endif 260 261 int securelevel = -1; 262 static struct mtx securelevel_mtx; 263 264 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 265 MTX_DEF); 266 267 static int 268 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 269 { 270 struct prison *pr; 271 int error, level; 272 273 pr = req->td->td_ucred->cr_prison; 274 275 /* 276 * If the process is in jail, return the maximum of the global and 277 * local levels; otherwise, return the global level. Perform a 278 * lockless read since the securelevel is an integer. 279 */ 280 if (pr != NULL) 281 level = imax(securelevel, pr->pr_securelevel); 282 else 283 level = securelevel; 284 error = sysctl_handle_int(oidp, &level, 0, req); 285 if (error || !req->newptr) 286 return (error); 287 /* 288 * Permit update only if the new securelevel exceeds the 289 * global level, and local level if any. 290 */ 291 if (pr != NULL) { 292 mtx_lock(&pr->pr_mtx); 293 if (!regression_securelevel_nonmonotonic && 294 (level < imax(securelevel, pr->pr_securelevel))) { 295 mtx_unlock(&pr->pr_mtx); 296 return (EPERM); 297 } 298 pr->pr_securelevel = level; 299 mtx_unlock(&pr->pr_mtx); 300 } else { 301 mtx_lock(&securelevel_mtx); 302 if (!regression_securelevel_nonmonotonic && 303 (level < securelevel)) { 304 mtx_unlock(&securelevel_mtx); 305 return (EPERM); 306 } 307 securelevel = level; 308 mtx_unlock(&securelevel_mtx); 309 } 310 return (error); 311 } 312 313 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 314 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 315 "I", "Current secure level"); 316 317 #ifdef INCLUDE_CONFIG_FILE 318 /* Actual kernel configuration options. */ 319 extern char kernconfstring[]; 320 321 static int 322 sysctl_kern_config(SYSCTL_HANDLER_ARGS) 323 { 324 return (sysctl_handle_string(oidp, kernconfstring, 325 strlen(kernconfstring), req)); 326 } 327 328 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW, 329 0, 0, sysctl_kern_config, "", "Kernel configuration file"); 330 #endif 331 332 char domainname[MAXHOSTNAMELEN]; 333 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 334 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 335 336 u_long hostid; 337 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 338 char hostuuid[64] = "00000000-0000-0000-0000-000000000000"; 339 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid, 340 sizeof(hostuuid), "Host UUID"); 341 342 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 343 344 #ifdef COMPAT_FREEBSD4 345 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 346 #endif 347 348 #ifdef COMPAT_FREEBSD5 349 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 350 #endif 351 352 #ifdef COMPAT_FREEBSD6 353 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 354 #endif 355 356 /* 357 * This is really cheating. These actually live in the libc, something 358 * which I'm not quite sure is a good idea anyway, but in order for 359 * getnext and friends to actually work, we define dummies here. 360 */ 361 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 362 "", 0, "PATH that finds all the standard utilities"); 363 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 364 0, 0, "Max ibase/obase values in bc(1)"); 365 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 366 0, 0, "Max array size in bc(1)"); 367 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 368 0, 0, "Max scale value in bc(1)"); 369 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 370 0, 0, "Max string length in bc(1)"); 371 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 372 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 373 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 374 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 375 0, 0, "Max length (bytes) of a text-processing utility's input line"); 376 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 377 0, 0, "Maximum number of repeats of a regexp permitted"); 378 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 379 0, 0, 380 "The version of POSIX 1003.2 with which the system attempts to comply"); 381 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 382 0, 0, "Whether C development supports the C bindings option"); 383 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 384 0, 0, "Whether system supports the C development utilities option"); 385 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 386 0, 0, ""); 387 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 388 0, 0, "Whether system supports FORTRAN development utilities"); 389 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 390 0, 0, "Whether system supports FORTRAN runtime utilities"); 391 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 392 0, 0, "Whether system supports creation of locales"); 393 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 394 0, 0, "Whether system supports software development utilities"); 395 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 396 0, 0, "Whether system supports the user portability utilities"); 397 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 398 0, 0, "Min Maximum number of streams a process may have open at one time"); 399 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 400 0, 0, "Min Maximum number of types supported for timezone names"); 401 402 #include <sys/vnode.h> 403 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 404 0, sizeof(struct vnode), "sizeof(struct vnode)"); 405 406 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 407 0, sizeof(struct proc), "sizeof(struct proc)"); 408 409 #include <sys/bio.h> 410 #include <sys/buf.h> 411 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 412 0, sizeof(struct bio), "sizeof(struct bio)"); 413 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 414 0, sizeof(struct buf), "sizeof(struct buf)"); 415 416 #include <sys/user.h> 417 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 418 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 419 420 /* XXX compatibility, remove for 6.0 */ 421 #include <sys/imgact.h> 422 #include <sys/imgact_elf.h> 423 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 424 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 425 "compatibility for kern.fallback_elf_brand");
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