kern_mib.c revision 192895
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: head/sys/kern/kern_mib.c 192895 2009-05-27 14:11:23Z jamie $"); 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/sx.h> 56#include <sys/unistd.h> 57#include <sys/vimage.h> 58 59SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 60 "Sysctl internal magic"); 61SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 62 "High kernel, proc, limits &c"); 63SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 64 "Virtual memory"); 65SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 66 "File system"); 67SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 68 "Network, (see socket.h)"); 69SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 70 "Debugging"); 71SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 72 "Sizeof various things"); 73SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 74 "hardware"); 75SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 76 "machine dependent"); 77SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 78 "user-level"); 79SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 80 "p1003_1b, (see p1003_1b.h)"); 81 82SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 83 "Compatibility code"); 84SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 85 "Security"); 86#ifdef REGRESSION 87SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 88 "Regression test MIB"); 89#endif 90 91SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD|CTLFLAG_MPSAFE, 92 kern_ident, 0, "Kernel identifier"); 93 94SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD|CTLFLAG_MPSAFE, 95 osrelease, 0, "Operating system release"); 96 97SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 98 0, BSD, "Operating system revision"); 99 100SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD|CTLFLAG_MPSAFE, 101 version, 0, "Kernel version"); 102 103SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD|CTLFLAG_MPSAFE, 104 ostype, 0, "Operating system type"); 105 106/* 107 * NOTICE: The *userland* release date is available in 108 * /usr/include/osreldate.h 109 */ 110SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 111 &osreldate, 0, "Kernel release date"); 112 113SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN, 114 &maxproc, 0, "Maximum number of processes"); 115 116SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 117 &maxprocperuid, 0, "Maximum processes allowed per userid"); 118 119SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN, 120 &maxusers, 0, "Hint for kernel tuning"); 121 122SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 123 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 124 125SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 126 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 127 128SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 129 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 130 131SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 132 0, 1, "Whether job control is available"); 133 134#ifdef _POSIX_SAVED_IDS 135SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 136 0, 1, "Whether saved set-group/user ID is available"); 137#else 138SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 139 0, 0, "Whether saved set-group/user ID is available"); 140#endif 141 142char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 143 144SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 145 kernelname, sizeof kernelname, "Name of kernel file booted"); 146 147SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 148 &mp_ncpus, 0, "Number of active CPUs"); 149 150SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 151 0, BYTE_ORDER, "System byte order"); 152 153SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 154 0, PAGE_SIZE, "System memory page size"); 155 156static int 157sysctl_kern_arnd(SYSCTL_HANDLER_ARGS) 158{ 159 char buf[256]; 160 size_t len; 161 162 len = req->oldlen; 163 if (len > sizeof(buf)) 164 len = sizeof(buf); 165 arc4rand(buf, len, 0); 166 return (SYSCTL_OUT(req, buf, len)); 167} 168 169SYSCTL_PROC(_kern, KERN_ARND, arandom, 170 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 171 sysctl_kern_arnd, "", "arc4rand"); 172 173static int 174sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 175{ 176 u_long val; 177 178 val = ctob(physmem); 179 return (sysctl_handle_long(oidp, &val, 0, req)); 180} 181 182SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 183 0, 0, sysctl_hw_physmem, "LU", ""); 184 185static int 186sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 187{ 188 u_long val; 189 val = ctob(realmem); 190 return (sysctl_handle_long(oidp, &val, 0, req)); 191} 192SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 193 0, 0, sysctl_hw_realmem, "LU", ""); 194static int 195sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 196{ 197 u_long val; 198 199 val = ctob(physmem - cnt.v_wire_count); 200 return (sysctl_handle_long(oidp, &val, 0, req)); 201} 202 203SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 204 0, 0, sysctl_hw_usermem, "LU", ""); 205 206SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 207 208static char machine_arch[] = MACHINE_ARCH; 209SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 210 machine_arch, 0, "System architecture"); 211 212#ifdef VIMAGE_GLOBALS 213char hostname[MAXHOSTNAMELEN]; 214#endif 215 216/* 217 * This mutex is used to protect the hostname and domainname variables, and 218 * perhaps in the future should also protect hostid, hostuid, and others. 219 */ 220struct mtx hostname_mtx; 221MTX_SYSINIT(hostname_mtx, &hostname_mtx, "hostname", MTX_DEF); 222 223static int 224sysctl_hostname(SYSCTL_HANDLER_ARGS) 225{ 226 INIT_VPROCG(TD_TO_VPROCG(req->td)); 227 struct prison *pr; 228 char tmphostname[MAXHOSTNAMELEN]; 229 int error; 230 231 pr = req->td->td_ucred->cr_prison; 232 if (pr != &prison0) { 233 if (!(pr->pr_allow & PR_ALLOW_SET_HOSTNAME) && req->newptr) 234 return (EPERM); 235 /* 236 * Process is in jail, so make a local copy of jail 237 * hostname to get/set so we don't have to hold the jail 238 * mutex during the sysctl copyin/copyout activities. 239 */ 240 mtx_lock(&pr->pr_mtx); 241 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 242 mtx_unlock(&pr->pr_mtx); 243 244 error = sysctl_handle_string(oidp, tmphostname, 245 sizeof pr->pr_host, req); 246 247 if (req->newptr != NULL && error == 0) { 248 /* 249 * Copy the locally set hostname to the jail, if 250 * appropriate. 251 */ 252 mtx_lock(&pr->pr_mtx); 253 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 254 mtx_unlock(&pr->pr_mtx); 255 } 256 } else { 257 mtx_lock(&hostname_mtx); 258 bcopy(V_hostname, tmphostname, MAXHOSTNAMELEN); 259 mtx_unlock(&hostname_mtx); 260 error = sysctl_handle_string(oidp, tmphostname, 261 sizeof tmphostname, req); 262 if (req->newptr != NULL && error == 0) { 263 mtx_lock(&prison0.pr_mtx); 264 mtx_lock(&hostname_mtx); 265 bcopy(tmphostname, prison0.pr_host, MAXHOSTNAMELEN); 266 bcopy(tmphostname, V_hostname, MAXHOSTNAMELEN); 267 mtx_unlock(&hostname_mtx); 268 mtx_unlock(&prison0.pr_mtx); 269 } 270 } 271 return (error); 272} 273 274SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 275 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON|CTLFLAG_MPSAFE, 276 0, 0, sysctl_hostname, "A", "Hostname"); 277 278static int regression_securelevel_nonmonotonic = 0; 279 280#ifdef REGRESSION 281SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 282 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 283#endif 284 285static int 286sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 287{ 288 struct prison *pr, *cpr; 289 int descend, error, level; 290 291 pr = req->td->td_ucred->cr_prison; 292 293 /* 294 * Reading the securelevel is easy, since the current jail's level 295 * is known to be at least as secure as any higher levels. Perform 296 * a lockless read since the securelevel is an integer. 297 */ 298 level = pr->pr_securelevel; 299 error = sysctl_handle_int(oidp, &level, 0, req); 300 if (error || !req->newptr) 301 return (error); 302 /* Permit update only if the new securelevel exceeds the old. */ 303 sx_slock(&allprison_lock); 304 mtx_lock(&pr->pr_mtx); 305 if (!regression_securelevel_nonmonotonic && 306 level < pr->pr_securelevel) { 307 mtx_unlock(&pr->pr_mtx); 308 sx_sunlock(&allprison_lock); 309 return (EPERM); 310 } 311 pr->pr_securelevel = level; 312 /* 313 * Set all child jails to be at least this level, but do not lower 314 * them (even if regression_securelevel_nonmonotonic). 315 */ 316 FOREACH_PRISON_DESCENDANT_LOCKED(pr, cpr, descend) { 317 if (cpr->pr_securelevel < level) 318 cpr->pr_securelevel = level; 319 } 320 mtx_unlock(&pr->pr_mtx); 321 sx_sunlock(&allprison_lock); 322 return (error); 323} 324 325SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 326 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 327 "I", "Current secure level"); 328 329#ifdef INCLUDE_CONFIG_FILE 330/* Actual kernel configuration options. */ 331extern char kernconfstring[]; 332 333static int 334sysctl_kern_config(SYSCTL_HANDLER_ARGS) 335{ 336 return (sysctl_handle_string(oidp, kernconfstring, 337 strlen(kernconfstring), req)); 338} 339 340SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW, 341 0, 0, sysctl_kern_config, "", "Kernel configuration file"); 342#endif 343 344#ifdef VIMAGE_GLOBALS 345char domainname[MAXHOSTNAMELEN]; /* Protected by hostname_mtx. */ 346#endif 347 348static int 349sysctl_domainname(SYSCTL_HANDLER_ARGS) 350{ 351 INIT_VPROCG(TD_TO_VPROCG(req->td)); 352 char tmpdomainname[MAXHOSTNAMELEN]; 353 int error; 354 355 mtx_lock(&hostname_mtx); 356 bcopy(V_domainname, tmpdomainname, MAXHOSTNAMELEN); 357 mtx_unlock(&hostname_mtx); 358 error = sysctl_handle_string(oidp, tmpdomainname, 359 sizeof tmpdomainname, req); 360 if (req->newptr != NULL && error == 0) { 361 mtx_lock(&hostname_mtx); 362 bcopy(tmpdomainname, V_domainname, MAXHOSTNAMELEN); 363 mtx_unlock(&hostname_mtx); 364 } 365 return (error); 366} 367 368SYSCTL_PROC(_kern, KERN_NISDOMAINNAME, domainname, CTLTYPE_STRING|CTLFLAG_RW, 369 0, 0, sysctl_domainname, "A", "Name of the current YP/NIS domain"); 370 371u_long hostid; 372SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 373char hostuuid[64] = "00000000-0000-0000-0000-000000000000"; 374SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid, 375 sizeof(hostuuid), "Host UUID"); 376 377SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 378 379#ifdef COMPAT_FREEBSD4 380FEATURE(compat_freebsd4, "Compatible with FreeBSD 4"); 381#endif 382 383#ifdef COMPAT_FREEBSD5 384FEATURE(compat_freebsd5, "Compatible with FreeBSD 5"); 385#endif 386 387#ifdef COMPAT_FREEBSD6 388FEATURE(compat_freebsd6, "Compatible with FreeBSD 6"); 389#endif 390 391#ifdef COMPAT_FREEBSD7 392FEATURE(compat_freebsd7, "Compatible with FreeBSD 7"); 393#endif 394 395/* 396 * This is really cheating. These actually live in the libc, something 397 * which I'm not quite sure is a good idea anyway, but in order for 398 * getnext and friends to actually work, we define dummies here. 399 */ 400SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 401 "", 0, "PATH that finds all the standard utilities"); 402SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 403 0, 0, "Max ibase/obase values in bc(1)"); 404SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 405 0, 0, "Max array size in bc(1)"); 406SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 407 0, 0, "Max scale value in bc(1)"); 408SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 409 0, 0, "Max string length in bc(1)"); 410SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 411 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 412SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 413SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 414 0, 0, "Max length (bytes) of a text-processing utility's input line"); 415SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 416 0, 0, "Maximum number of repeats of a regexp permitted"); 417SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 418 0, 0, 419 "The version of POSIX 1003.2 with which the system attempts to comply"); 420SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 421 0, 0, "Whether C development supports the C bindings option"); 422SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 423 0, 0, "Whether system supports the C development utilities option"); 424SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 425 0, 0, ""); 426SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 427 0, 0, "Whether system supports FORTRAN development utilities"); 428SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 429 0, 0, "Whether system supports FORTRAN runtime utilities"); 430SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 431 0, 0, "Whether system supports creation of locales"); 432SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 433 0, 0, "Whether system supports software development utilities"); 434SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 435 0, 0, "Whether system supports the user portability utilities"); 436SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 437 0, 0, "Min Maximum number of streams a process may have open at one time"); 438SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 439 0, 0, "Min Maximum number of types supported for timezone names"); 440 441#include <sys/vnode.h> 442SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 443 0, sizeof(struct vnode), "sizeof(struct vnode)"); 444 445SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 446 0, sizeof(struct proc), "sizeof(struct proc)"); 447 448#include <sys/bio.h> 449#include <sys/buf.h> 450SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 451 0, sizeof(struct bio), "sizeof(struct bio)"); 452SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 453 0, sizeof(struct buf), "sizeof(struct buf)"); 454 455#include <sys/user.h> 456SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 457 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 458 459/* XXX compatibility, remove for 6.0 */ 460#include <sys/imgact.h> 461#include <sys/imgact_elf.h> 462SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 463 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 464 "compatibility for kern.fallback_elf_brand"); 465