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