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 #include <sys/vimage.h> 57 58 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 59 "Sysctl internal magic"); 60 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 61 "High kernel, proc, limits &c"); 62 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 63 "Virtual memory"); 64 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 65 "File system"); 66 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 67 "Network, (see socket.h)"); 68 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 69 "Debugging"); 70 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 71 "Sizeof various things"); 72 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 73 "hardware"); 74 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 75 "machine dependent"); 76 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 77 "user-level"); 78 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 79 "p1003_1b, (see p1003_1b.h)"); 80 81 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 82 "Compatibility code"); 83 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 84 "Security"); 85 #ifdef REGRESSION 86 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 87 "Regression test MIB"); 88 #endif 89 90 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 91 kern_ident, 0, "Kernel identifier"); 92 93 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE, 94 osrelease, 0, "Operating system release"); 95 96 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 97 0, BSD, "Operating system revision"); 98 99 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 100 version, 0, "Kernel version"); 101 102 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE, 103 ostype, 0, "Operating system type"); 104 105 /* 106 * NOTICE: The *userland* release date is available in 107 * /usr/include/osreldate.h 108 */ 109 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 110 &osreldate, 0, "Kernel release date"); 111 112 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN, 113 &maxproc, 0, "Maximum number of processes"); 114 115 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 116 &maxprocperuid, 0, "Maximum processes allowed per userid"); 117 118 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN, 119 &maxusers, 0, "Hint for kernel tuning"); 120 121 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 122 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 123 124 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 125 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 126 127 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 128 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 129 130 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 131 0, 1, "Whether job control is available"); 132 133 #ifdef _POSIX_SAVED_IDS 134 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 135 0, 1, "Whether saved set-group/user ID is available"); 136 #else 137 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 138 0, 0, "Whether saved set-group/user ID is available"); 139 #endif 140 141 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 142 143 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 144 kernelname, sizeof kernelname, "Name of kernel file booted"); 145 146 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 147 &mp_ncpus, 0, "Number of active CPUs"); 148 149 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 150 0, BYTE_ORDER, "System byte order"); 151 152 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 153 0, PAGE_SIZE, "System memory page size"); 154 155 static int 156 sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 157 { 158 char buf[256]; 159 size_t len; 160 161 len = req->oldlen; 162 if (len > sizeof(buf)) 163 len = sizeof(buf); 164 arc4rand(buf, len, 0); 165 return (SYSCTL_OUT(req, buf, len)); 166 } 167 168 SYSCTL_PROC(_kern, KERN_ARND, arandom, 169 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 170 sysctl_kern_arnd, "", "arc4rand"); 171 172 static int 173 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 174 { 175 u_long val; 176 177 val = ctob(physmem); 178 return (sysctl_handle_long(oidp, &val, 0, req)); 179 } 180 181 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 182 0, 0, sysctl_hw_physmem, "LU", ""); 183 184 static int 185 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 186 { 187 u_long val; 188 val = ctob(realmem); 189 return (sysctl_handle_long(oidp, &val, 0, req)); 190 } 191 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 192 0, 0, sysctl_hw_realmem, "LU", ""); 193 static int 194 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 195 { 196 u_long val; 197 198 val = ctob(physmem - cnt.v_wire_count); 199 return (sysctl_handle_long(oidp, &val, 0, req)); 200 } 201 202 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 203 0, 0, sysctl_hw_usermem, "LU", ""); 204 205 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 206 207 static char machine_arch[] = MACHINE_ARCH; 208 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 209 machine_arch, 0, "System architecture"); 210 211 /* should become #ifndef VIMAGE */ 212 char hostname[MAXHOSTNAMELEN]; 213 214 /* 215 * This mutex is used to protect the hostname and domainname variables, and 216 * perhaps in the future should also protect hostid, hostuid, and others. 217 */ 218 struct mtx hostname_mtx; 219 MTX_SYSINIT(hostname_mtx, &hostname_mtx, "hostname", MTX_DEF); 220 221 static int 222 sysctl_hostname(SYSCTL_HANDLER_ARGS) 223 { 224 INIT_VPROCG(TD_TO_VPROCG(req->td)); 225 struct prison *pr; 226 char tmphostname[MAXHOSTNAMELEN]; 227 int error; 228 229 pr = req->td->td_ucred->cr_prison; 230 if (pr != NULL) { 231 if (!jail_set_hostname_allowed && req->newptr) 232 return (EPERM); 233 /* 234 * Process is in jail, so make a local copy of jail 235 * hostname to get/set so we don't have to hold the jail 236 * mutex during the sysctl copyin/copyout activities. 237 */ 238 mtx_lock(&pr->pr_mtx); 239 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 240 mtx_unlock(&pr->pr_mtx); 241 242 error = sysctl_handle_string(oidp, tmphostname, 243 sizeof pr->pr_host, req); 244 245 if (req->newptr != NULL && error == 0) { 246 /* 247 * Copy the locally set hostname to the jail, if 248 * appropriate. 249 */ 250 mtx_lock(&pr->pr_mtx); 251 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 252 mtx_unlock(&pr->pr_mtx); 253 } 254 } else { 255 mtx_lock(&hostname_mtx); 256 bcopy(V_hostname, tmphostname, MAXHOSTNAMELEN); 257 mtx_unlock(&hostname_mtx); 258 error = sysctl_handle_string(oidp, tmphostname, 259 sizeof tmphostname, req); 260 if (req->newptr != NULL && error == 0) { 261 mtx_lock(&hostname_mtx); 262 bcopy(tmphostname, V_hostname, MAXHOSTNAMELEN); 263 mtx_unlock(&hostname_mtx); 264 } 265 } 266 return (error); 267 } 268 269 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 270 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON|CTLFLAG_MPSAFE, 271 0, 0, sysctl_hostname, "A", "Hostname"); 272 273 static int regression_securelevel_nonmonotonic = 0; 274 275 #ifdef REGRESSION 276 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 277 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 278 #endif 279 280 int securelevel = -1; 281 static struct mtx securelevel_mtx; 282 283 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 284 MTX_DEF); 285 286 static int 287 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 288 { 289 struct prison *pr; 290 int error, level; 291 292 pr = req->td->td_ucred->cr_prison; 293 294 /* 295 * If the process is in jail, return the maximum of the global and 296 * local levels; otherwise, return the global level. Perform a 297 * lockless read since the securelevel is an integer. 298 */ 299 if (pr != NULL) 300 level = imax(securelevel, pr->pr_securelevel); 301 else 302 level = securelevel; 303 error = sysctl_handle_int(oidp, &level, 0, req); 304 if (error || !req->newptr) 305 return (error); 306 /* 307 * Permit update only if the new securelevel exceeds the 308 * global level, and local level if any. 309 */ 310 if (pr != NULL) { 311 mtx_lock(&pr->pr_mtx); 312 if (!regression_securelevel_nonmonotonic && 313 (level < imax(securelevel, pr->pr_securelevel))) { 314 mtx_unlock(&pr->pr_mtx); 315 return (EPERM); 316 } 317 pr->pr_securelevel = level; 318 mtx_unlock(&pr->pr_mtx); 319 } else { 320 mtx_lock(&securelevel_mtx); 321 if (!regression_securelevel_nonmonotonic && 322 (level < securelevel)) { 323 mtx_unlock(&securelevel_mtx); 324 return (EPERM); 325 } 326 securelevel = level; 327 mtx_unlock(&securelevel_mtx); 328 } 329 return (error); 330 } 331 332 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 333 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 334 "I", "Current secure level"); 335 336 #ifdef INCLUDE_CONFIG_FILE 337 /* Actual kernel configuration options. */ 338 extern char kernconfstring[]; 339 340 static int 341 sysctl_kern_config(SYSCTL_HANDLER_ARGS) 342 { 343 return (sysctl_handle_string(oidp, kernconfstring, 344 strlen(kernconfstring), req)); 345 } 346 347 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW, 348 0, 0, sysctl_kern_config, "", "Kernel configuration file"); 349 #endif 350 351 /* should become #ifndef VIMAGE */ 352 char domainname[MAXHOSTNAMELEN]; /* Protected by hostname_mtx. */ 353 354 static int 355 sysctl_domainname(SYSCTL_HANDLER_ARGS) 356 { 357 char tmpdomainname[MAXHOSTNAMELEN]; 358 int error; 359 360 mtx_lock(&hostname_mtx); 361 bcopy(V_domainname, tmpdomainname, MAXHOSTNAMELEN); 362 mtx_unlock(&hostname_mtx); 363 error = sysctl_handle_string(oidp, tmpdomainname, 364 sizeof tmpdomainname, req); 365 if (req->newptr != NULL && error == 0) { 366 mtx_lock(&hostname_mtx); 367 bcopy(tmpdomainname, V_domainname, MAXHOSTNAMELEN); 368 mtx_unlock(&hostname_mtx); 369 } 370 return (error); 371 } 372 373 SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, CTLTYPE_STRING|CTLFLAG_RW, 374 0, 0, sysctl_domainname, "A", "Name of the current YP/NIS domain"); 375 376 u_long hostid; 377 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 378 char hostuuid[64] = "00000000-0000-0000-0000-000000000000"; 379 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid, 380 sizeof(hostuuid), "Host UUID"); 381 382 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 383 384 #ifdef COMPAT_FREEBSD4 385 FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 386 #endif 387 388 #ifdef COMPAT_FREEBSD5 389 FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 390 #endif 391 392 #ifdef COMPAT_FREEBSD6 393 FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 394 #endif 395 396 #ifdef COMPAT_FREEBSD7 397 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 398 #endif 399 400 /* 401 * This is really cheating. These actually live in the libc, something 402 * which I'm not quite sure is a good idea anyway, but in order for 403 * getnext and friends to actually work, we define dummies here. 404 */ 405 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 406 "", 0, "PATH that finds all the standard utilities"); 407 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 408 0, 0, "Max ibase/obase values in bc(1)"); 409 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 410 0, 0, "Max array size in bc(1)"); 411 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 412 0, 0, "Max scale value in bc(1)"); 413 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 414 0, 0, "Max string length in bc(1)"); 415 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 416 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 417 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 418 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 419 0, 0, "Max length (bytes) of a text-processing utility's input line"); 420 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 421 0, 0, "Maximum number of repeats of a regexp permitted"); 422 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 423 0, 0, 424 "The version of POSIX 1003.2 with which the system attempts to comply"); 425 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 426 0, 0, "Whether C development supports the C bindings option"); 427 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 428 0, 0, "Whether system supports the C development utilities option"); 429 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 430 0, 0, ""); 431 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 432 0, 0, "Whether system supports FORTRAN development utilities"); 433 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 434 0, 0, "Whether system supports FORTRAN runtime utilities"); 435 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 436 0, 0, "Whether system supports creation of locales"); 437 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 438 0, 0, "Whether system supports software development utilities"); 439 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 440 0, 0, "Whether system supports the user portability utilities"); 441 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 442 0, 0, "Min Maximum number of streams a process may have open at one time"); 443 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 444 0, 0, "Min Maximum number of types supported for timezone names"); 445 446 #include <sys/vnode.h> 447 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 448 0, sizeof(struct vnode), "sizeof(struct vnode)"); 449 450 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 451 0, sizeof(struct proc), "sizeof(struct proc)"); 452 453 #include <sys/bio.h> 454 #include <sys/buf.h> 455 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 456 0, sizeof(struct bio), "sizeof(struct bio)"); 457 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 458 0, sizeof(struct buf), "sizeof(struct buf)"); 459 460 #include <sys/user.h> 461 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 462 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 463 464 /* XXX compatibility, remove for 6.0 */ 465 #include <sys/imgact.h> 466 #include <sys/imgact_elf.h> 467 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 468 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 469 "compatibility for kern.fallback_elf_brand"); 470