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 #include "opt_config.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/sbuf.h> 47 #include <sys/systm.h> 48 #include <sys/sysctl.h> 49 #include <sys/proc.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/jail.h> 53 #include <sys/smp.h> 54 #include <sys/unistd.h> 55 56 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 57 "Sysctl internal magic"); 58 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 59 "High kernel, proc, limits &c"); 60 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 61 "Virtual memory"); 62 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 63 "File system"); 64 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 65 "Network, (see socket.h)"); 66 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 67 "Debugging"); 68 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 69 "Sizeof various things"); 70 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 71 "hardware"); 72 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 73 "machine dependent"); 74 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 75 "user-level"); 76 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 77 "p1003_1b, (see p1003_1b.h)"); 78 79 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 80 "Compatibility code"); 81 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 82 "Security"); 83 #ifdef REGRESSION 84 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 85 "Regression test MIB"); 86 #endif 87 88 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD, 89 kern_ident, 0, "Kernel identifier"); 90 91 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 92 osrelease, 0, "Operating system release"); 93 94 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 95 0, BSD, "Operating system revision"); 96 97 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 98 version, 0, "Kernel version"); 99 100 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 101 ostype, 0, "Operating system type"); 102 103 /* 104 * NOTICE: The *userland* release date is available in 105 * /usr/include/osreldate.h 106 */ 107 extern int osreldate; 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_hw_physmem(SYSCTL_HANDLER_ARGS) 156 { 157 u_long val; 158 159 val = ctob(physmem); 160 return (sysctl_handle_long(oidp, &val, 0, req)); 161 } 162 163 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 164 0, 0, sysctl_hw_physmem, "LU", ""); 165 166 static int 167 sysctl_hw_realmem(SYSCTL_HANDLER_ARGS) 168 { 169 u_long val; 170 val = ctob(realmem); 171 return (sysctl_handle_long(oidp, &val, 0, req)); 172 } 173 SYSCTL_PROC(_hw, HW_REALMEM, realmem, CTLTYPE_ULONG | CTLFLAG_RD, 174 0, 0, sysctl_hw_realmem, "LU", ""); 175 static int 176 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 177 { 178 u_long val; 179 180 val = ctob(physmem - VMCNT_GET(wire_count)); 181 return (sysctl_handle_long(oidp, &val, 0, req)); 182 } 183 184 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 185 0, 0, sysctl_hw_usermem, "LU", ""); 186 187 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 188 189 static char machine_arch[] = MACHINE_ARCH; 190 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 191 machine_arch, 0, "System architecture"); 192 193 char hostname[MAXHOSTNAMELEN]; 194 195 static int 196 sysctl_hostname(SYSCTL_HANDLER_ARGS) 197 { 198 struct prison *pr; 199 char tmphostname[MAXHOSTNAMELEN]; 200 int error; 201 202 pr = req->td->td_ucred->cr_prison; 203 if (pr != NULL) { 204 if (!jail_set_hostname_allowed && req->newptr) 205 return (EPERM); 206 /* 207 * Process is in jail, so make a local copy of jail 208 * hostname to get/set so we don't have to hold the jail 209 * mutex during the sysctl copyin/copyout activities. 210 */ 211 mtx_lock(&pr->pr_mtx); 212 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 213 mtx_unlock(&pr->pr_mtx); 214 215 error = sysctl_handle_string(oidp, tmphostname, 216 sizeof pr->pr_host, req); 217 218 if (req->newptr != NULL && error == 0) { 219 /* 220 * Copy the locally set hostname to the jail, if 221 * appropriate. 222 */ 223 mtx_lock(&pr->pr_mtx); 224 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 225 mtx_unlock(&pr->pr_mtx); 226 } 227 } else 228 error = sysctl_handle_string(oidp, 229 hostname, sizeof hostname, req); 230 return (error); 231 } 232 233 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 234 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON, 235 0, 0, sysctl_hostname, "A", "Hostname"); 236 237 static int regression_securelevel_nonmonotonic = 0; 238 239 #ifdef REGRESSION 240 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 241 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 242 #endif 243 244 int securelevel = -1; 245 static struct mtx securelevel_mtx; 246 247 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 248 MTX_DEF); 249 250 static int 251 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 252 { 253 struct prison *pr; 254 int error, level; 255 256 pr = req->td->td_ucred->cr_prison; 257 258 /* 259 * If the process is in jail, return the maximum of the global and 260 * local levels; otherwise, return the global level. Perform a 261 * lockless read since the securelevel is an integer. 262 */ 263 if (pr != NULL) 264 level = imax(securelevel, pr->pr_securelevel); 265 else 266 level = securelevel; 267 error = sysctl_handle_int(oidp, &level, 0, req); 268 if (error || !req->newptr) 269 return (error); 270 /* 271 * Permit update only if the new securelevel exceeds the 272 * global level, and local level if any. 273 */ 274 if (pr != NULL) { 275 mtx_lock(&pr->pr_mtx); 276 if (!regression_securelevel_nonmonotonic && 277 (level < imax(securelevel, pr->pr_securelevel))) { 278 mtx_unlock(&pr->pr_mtx); 279 return (EPERM); 280 } 281 pr->pr_securelevel = level; 282 mtx_unlock(&pr->pr_mtx); 283 } else { 284 mtx_lock(&securelevel_mtx); 285 if (!regression_securelevel_nonmonotonic && 286 (level < securelevel)) { 287 mtx_unlock(&securelevel_mtx); 288 return (EPERM); 289 } 290 securelevel = level; 291 mtx_unlock(&securelevel_mtx); 292 } 293 return (error); 294 } 295 296 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 297 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 298 "I", "Current secure level"); 299 300 #ifdef INCLUDE_CONFIG_FILE 301 /* Actual kernel configuration options. */ 302 extern char kernconfstring[]; 303 304 static int 305 sysctl_kern_config(SYSCTL_HANDLER_ARGS) 306 { 307 struct sbuf *sb; 308 int error; 309 char *p; 310 311 sb = sbuf_new(NULL, NULL, 2048, SBUF_AUTOEXTEND); 312 if (sb == NULL) 313 return (ENOMEM); 314 sbuf_clear(sb); 315 p = kernconfstring; 316 if (p == NULL || *p == '\0') { 317 sbuf_printf(sb, "No kernel configuration\n"); 318 } else { 319 sbuf_printf(sb, "%s", p); 320 } 321 sbuf_trim(sb); 322 sbuf_putc(sb, '\n'); 323 sbuf_finish(sb); 324 error = sysctl_handle_string(oidp, sbuf_data(sb), sbuf_len(sb), req); 325 if (error) 326 return (error); 327 sbuf_delete(sb); 328 return (error); 329 } 330 SYSCTL_PROC(_kern, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RW, 331 0, 0, sysctl_kern_config, "", "Kernel configuration file"); 332 #endif 333 334 char domainname[MAXHOSTNAMELEN]; 335 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 336 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 337 338 u_long hostid; 339 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 340 char hostuuid[64] = "00000000-0000-0000-0000-000000000000"; 341 SYSCTL_STRING(_kern, KERN_HOSTUUID, hostuuid, CTLFLAG_RW, hostuuid, 342 sizeof(hostuuid), "Host UUID"); 343 344 /* 345 * This is really cheating. These actually live in the libc, something 346 * which I'm not quite sure is a good idea anyway, but in order for 347 * getnext and friends to actually work, we define dummies here. 348 */ 349 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 350 "", 0, "PATH that finds all the standard utilities"); 351 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 352 0, 0, "Max ibase/obase values in bc(1)"); 353 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 354 0, 0, "Max array size in bc(1)"); 355 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 356 0, 0, "Max scale value in bc(1)"); 357 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 358 0, 0, "Max string length in bc(1)"); 359 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 360 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 361 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 362 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 363 0, 0, "Max length (bytes) of a text-processing utility's input line"); 364 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 365 0, 0, "Maximum number of repeats of a regexp permitted"); 366 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 367 0, 0, 368 "The version of POSIX 1003.2 with which the system attempts to comply"); 369 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 370 0, 0, "Whether C development supports the C bindings option"); 371 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 372 0, 0, "Whether system supports the C development utilities option"); 373 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 374 0, 0, ""); 375 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 376 0, 0, "Whether system supports FORTRAN development utilities"); 377 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 378 0, 0, "Whether system supports FORTRAN runtime utilities"); 379 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 380 0, 0, "Whether system supports creation of locales"); 381 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 382 0, 0, "Whether system supports software development utilities"); 383 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 384 0, 0, "Whether system supports the user portability utilities"); 385 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 386 0, 0, "Min Maximum number of streams a process may have open at one time"); 387 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 388 0, 0, "Min Maximum number of types supported for timezone names"); 389 390 #include <sys/vnode.h> 391 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 392 0, sizeof(struct vnode), "sizeof(struct vnode)"); 393 394 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 395 0, sizeof(struct proc), "sizeof(struct proc)"); 396 397 #include <sys/bio.h> 398 #include <sys/buf.h> 399 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 400 0, sizeof(struct bio), "sizeof(struct bio)"); 401 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 402 0, sizeof(struct buf), "sizeof(struct buf)"); 403 404 #include <sys/user.h> 405 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 406 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 407 408 /* XXX compatibility, remove for 6.0 */ 409 #include <sys/imgact.h> 410 #include <sys/imgact_elf.h> 411 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 412 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 413 "compatibility for kern.fallback_elf_brand"); 414