kern_mib.c revision 141013
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 141013 2005-01-30 00:31:19Z rwatson $"); 40 41#include "opt_posix.h" 42 43#include <sys/param.h> 44#include <sys/kernel.h> 45#include <sys/systm.h> 46#include <sys/sysctl.h> 47#include <sys/proc.h> 48#include <sys/lock.h> 49#include <sys/mutex.h> 50#include <sys/jail.h> 51#include <sys/smp.h> 52#include <sys/unistd.h> 53 54SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 55 "Sysctl internal magic"); 56SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 57 "High kernel, proc, limits &c"); 58SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 59 "Virtual memory"); 60SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 61 "File system"); 62SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 63 "Network, (see socket.h)"); 64SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 65 "Debugging"); 66SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 67 "Sizeof various things"); 68SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 69 "hardware"); 70SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 71 "machine dependent"); 72SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 73 "user-level"); 74SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 75 "p1003_1b, (see p1003_1b.h)"); 76 77SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 78 "Compatibility code"); 79SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 80 "Security"); 81#ifdef REGRESSION 82SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 83 "Regression test MIB"); 84#endif 85 86SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD, 87 kern_ident, 0, "Kernel identifier"); 88 89SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 90 osrelease, 0, "Operating system release"); 91 92SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 93 0, BSD, "Operating system revision"); 94 95SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 96 version, 0, "Kernel version"); 97 98SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 99 ostype, 0, "Operating system type"); 100 101/* 102 * NOTICE: The *userland* release date is available in 103 * /usr/include/osreldate.h 104 */ 105extern int osreldate; 106SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 107 &osreldate, 0, "Kernel release date"); 108 109SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN, 110 &maxproc, 0, "Maximum number of processes"); 111 112SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 113 &maxprocperuid, 0, "Maximum processes allowed per userid"); 114 115SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RDTUN, 116 &maxusers, 0, "Hint for kernel tuning"); 117 118SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 119 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 120 121SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 122 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 123 124SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 125 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 126 127SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 128 0, 1, "Whether job control is available"); 129 130#ifdef _POSIX_SAVED_IDS 131SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 132 0, 1, "Whether saved set-group/user ID is available"); 133#else 134SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 135 0, 0, "Whether saved set-group/user ID is available"); 136#endif 137 138char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 139 140SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 141 kernelname, sizeof kernelname, "Name of kernel file booted"); 142 143#ifdef SMP 144SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 145 &mp_ncpus, 0, "Number of active CPUs"); 146#else 147SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 148 0, 1, "Number of active CPUs"); 149#endif 150 151SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 152 0, BYTE_ORDER, "System byte order"); 153 154SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 155 0, PAGE_SIZE, "System memory page size"); 156 157static int 158sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 159{ 160 u_long val; 161 162 val = ctob(physmem); 163 return (sysctl_handle_long(oidp, &val, 0, req)); 164} 165 166SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 167 0, 0, sysctl_hw_physmem, "LU", ""); 168 169static int 170sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 171{ 172 u_long val; 173 174 val = ctob(physmem - cnt.v_wire_count); 175 return (sysctl_handle_long(oidp, &val, 0, req)); 176} 177 178SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 179 0, 0, sysctl_hw_usermem, "LU", ""); 180 181SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 182 183static char machine_arch[] = MACHINE_ARCH; 184SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 185 machine_arch, 0, "System architecture"); 186 187char hostname[MAXHOSTNAMELEN]; 188 189static int 190sysctl_hostname(SYSCTL_HANDLER_ARGS) 191{ 192 struct prison *pr; 193 char tmphostname[MAXHOSTNAMELEN]; 194 int error; 195 196 pr = req->td->td_ucred->cr_prison; 197 if (pr != NULL) { 198 if (!jail_set_hostname_allowed && req->newptr) 199 return (EPERM); 200 /* 201 * Process is in jail, so make a local copy of jail 202 * hostname to get/set so we don't have to hold the jail 203 * mutex during the sysctl copyin/copyout activities. 204 */ 205 mtx_lock(&pr->pr_mtx); 206 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 207 mtx_unlock(&pr->pr_mtx); 208 209 error = sysctl_handle_string(oidp, tmphostname, 210 sizeof pr->pr_host, req); 211 212 if (req->newptr != NULL && error == 0) { 213 /* 214 * Copy the locally set hostname to the jail, if 215 * appropriate. 216 */ 217 mtx_lock(&pr->pr_mtx); 218 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 219 mtx_unlock(&pr->pr_mtx); 220 } 221 } else 222 error = sysctl_handle_string(oidp, 223 hostname, sizeof hostname, req); 224 return (error); 225} 226 227SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 228 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON, 229 0, 0, sysctl_hostname, "A", "Hostname"); 230 231static int regression_securelevel_nonmonotonic = 0; 232 233#ifdef REGRESSION 234SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 235 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 236#endif 237 238int securelevel = -1; 239static struct mtx securelevel_mtx; 240 241MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 242 MTX_DEF); 243 244static int 245sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 246{ 247 struct prison *pr; 248 int error, level; 249 250 pr = req->td->td_ucred->cr_prison; 251 252 /* 253 * If the process is in jail, return the maximum of the global and 254 * local levels; otherwise, return the global level. Perform a 255 * lockless read since the securelevel is an integer. 256 */ 257 if (pr != NULL) 258 level = imax(securelevel, pr->pr_securelevel); 259 else 260 level = securelevel; 261 error = sysctl_handle_int(oidp, &level, 0, req); 262 if (error || !req->newptr) 263 return (error); 264 /* 265 * Permit update only if the new securelevel exceeds the 266 * global level, and local level if any. 267 */ 268 if (pr != NULL) { 269 mtx_lock(&pr->pr_mtx); 270 if (!regression_securelevel_nonmonotonic && 271 (level < imax(securelevel, pr->pr_securelevel))) { 272 mtx_unlock(&pr->pr_mtx); 273 return (EPERM); 274 } 275 pr->pr_securelevel = level; 276 mtx_unlock(&pr->pr_mtx); 277 } else { 278 mtx_lock(&securelevel_mtx); 279 if (!regression_securelevel_nonmonotonic && 280 (level < securelevel)) { 281 mtx_unlock(&securelevel_mtx); 282 return (EPERM); 283 } 284 securelevel = level; 285 mtx_unlock(&securelevel_mtx); 286 } 287 return (error); 288} 289 290SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 291 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 292 "I", "Current secure level"); 293 294char domainname[MAXHOSTNAMELEN]; 295SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 296 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 297 298u_long hostid; 299SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 300 301/* 302 * This is really cheating. These actually live in the libc, something 303 * which I'm not quite sure is a good idea anyway, but in order for 304 * getnext and friends to actually work, we define dummies here. 305 */ 306SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 307 "", 0, "PATH that finds all the standard utilities"); 308SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 309 0, 0, "Max ibase/obase values in bc(1)"); 310SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 311 0, 0, "Max array size in bc(1)"); 312SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 313 0, 0, "Max scale value in bc(1)"); 314SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 315 0, 0, "Max string length in bc(1)"); 316SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 317 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 318SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 319SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 320 0, 0, "Max length (bytes) of a text-processing utility's input line"); 321SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 322 0, 0, "Maximum number of repeats of a regexp permitted"); 323SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 324 0, 0, 325 "The version of POSIX 1003.2 with which the system attempts to comply"); 326SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 327 0, 0, "Whether C development supports the C bindings option"); 328SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 329 0, 0, "Whether system supports the C development utilities option"); 330SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 331 0, 0, ""); 332SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 333 0, 0, "Whether system supports FORTRAN development utilities"); 334SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 335 0, 0, "Whether system supports FORTRAN runtime utilities"); 336SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 337 0, 0, "Whether system supports creation of locales"); 338SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 339 0, 0, "Whether system supports software development utilities"); 340SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 341 0, 0, "Whether system supports the user portability utilities"); 342SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 343 0, 0, "Min Maximum number of streams a process may have open at one time"); 344SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 345 0, 0, "Min Maximum number of types supported for timezone names"); 346 347#include <sys/vnode.h> 348SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 349 0, sizeof(struct vnode), "sizeof(struct vnode)"); 350 351SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 352 0, sizeof(struct proc), "sizeof(struct proc)"); 353 354#include <sys/conf.h> 355SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 356 0, sizeof(struct cdev), "sizeof(struct cdev)"); 357 358#include <sys/bio.h> 359#include <sys/buf.h> 360SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 361 0, sizeof(struct bio), "sizeof(struct bio)"); 362SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 363 0, sizeof(struct buf), "sizeof(struct buf)"); 364 365#include <sys/user.h> 366SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 367 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 368 369/* XXX compatibility, remove for 6.0 */ 370#include <sys/imgact.h> 371#include <sys/imgact_elf.h> 372SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 373 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 374 "compatibility for kern.fallback_elf_brand"); 375