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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 40 * $FreeBSD$ 41 */ 42 43 #include "opt_posix.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.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, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 89 osrelease, 0, "Operating system release"); 90 91 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 92 0, BSD, "Operating system revision"); 93 94 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 95 version, 0, "Kernel version"); 96 97 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 98 ostype, 0, "Operating system type"); 99 100 extern int osreldate; 101 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 102 &osreldate, 0, "Operating system release date"); 103 104 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 105 &maxproc, 0, "Maximum number of processes"); 106 107 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 108 &maxprocperuid, 0, "Maximum processes allowed per userid"); 109 110 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 111 &maxusers, 0, "Hint for kernel tuning"); 112 113 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 114 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 115 116 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 117 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 118 119 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 120 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 121 122 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 123 0, 1, "Whether job control is available"); 124 125 #ifdef _POSIX_SAVED_IDS 126 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 127 0, 1, "Whether saved set-group/user ID is available"); 128 #else 129 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 130 0, 0, "Whether saved set-group/user ID is available"); 131 #endif 132 133 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 134 135 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 136 kernelname, sizeof kernelname, "Name of kernel file booted"); 137 138 #ifdef SMP 139 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 140 &mp_ncpus, 0, "Number of active CPUs"); 141 #else 142 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 143 0, 1, "Number of active CPUs"); 144 #endif 145 146 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 147 0, BYTE_ORDER, "System byte order"); 148 149 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 150 0, PAGE_SIZE, "System memory page size"); 151 152 static int 153 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 154 { 155 u_long val; 156 157 val = ctob(physmem); 158 return (sysctl_handle_long(oidp, &val, 0, req)); 159 } 160 161 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG | CTLFLAG_RD, 162 0, 0, sysctl_hw_physmem, "LU", ""); 163 164 static int 165 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 166 { 167 u_long val; 168 169 val = ctob(physmem - cnt.v_wire_count); 170 return (sysctl_handle_long(oidp, &val, 0, req)); 171 } 172 173 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG | CTLFLAG_RD, 174 0, 0, sysctl_hw_usermem, "LU", ""); 175 176 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &physmem, 0, ""); 177 178 static char machine_arch[] = MACHINE_ARCH; 179 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 180 machine_arch, 0, "System architecture"); 181 182 char hostname[MAXHOSTNAMELEN]; 183 184 static int 185 sysctl_hostname(SYSCTL_HANDLER_ARGS) 186 { 187 struct prison *pr; 188 char tmphostname[MAXHOSTNAMELEN]; 189 int error; 190 191 pr = req->td->td_ucred->cr_prison; 192 if (pr != NULL) { 193 if (!jail_set_hostname_allowed && req->newptr) 194 return (EPERM); 195 /* 196 * Process is in jail, so make a local copy of jail 197 * hostname to get/set so we don't have to hold the jail 198 * mutex during the sysctl copyin/copyout activities. 199 */ 200 mtx_lock(&pr->pr_mtx); 201 bcopy(pr->pr_host, tmphostname, MAXHOSTNAMELEN); 202 mtx_unlock(&pr->pr_mtx); 203 204 error = sysctl_handle_string(oidp, tmphostname, 205 sizeof pr->pr_host, req); 206 207 if (req->newptr != NULL && error == 0) { 208 /* 209 * Copy the locally set hostname to the jail, if 210 * appropriate. 211 */ 212 mtx_lock(&pr->pr_mtx); 213 bcopy(tmphostname, pr->pr_host, MAXHOSTNAMELEN); 214 mtx_unlock(&pr->pr_mtx); 215 } 216 } else 217 error = sysctl_handle_string(oidp, 218 hostname, sizeof hostname, req); 219 return (error); 220 } 221 222 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 223 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON, 224 0, 0, sysctl_hostname, "A", "Hostname"); 225 226 static int regression_securelevel_nonmonotonic = 0; 227 228 #ifdef REGRESSION 229 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 230 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 231 #endif 232 233 int securelevel = -1; 234 struct mtx securelevel_mtx; 235 236 MTX_SYSINIT(securelevel_lock, &securelevel_mtx, "securelevel mutex lock", 237 MTX_DEF); 238 239 static int 240 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 241 { 242 struct prison *pr; 243 int error, level; 244 245 pr = req->td->td_ucred->cr_prison; 246 247 /* 248 * If the process is in jail, return the maximum of the global and 249 * local levels; otherwise, return the global level. 250 */ 251 if (pr != NULL) { 252 mtx_lock(&pr->pr_mtx); 253 level = imax(securelevel, pr->pr_securelevel); 254 mtx_unlock(&pr->pr_mtx); 255 } else 256 level = securelevel; 257 error = sysctl_handle_int(oidp, &level, 0, req); 258 if (error || !req->newptr) 259 return (error); 260 /* 261 * Permit update only if the new securelevel exceeds the 262 * global level, and local level if any. 263 */ 264 if (pr != NULL) { 265 mtx_lock(&pr->pr_mtx); 266 if (!regression_securelevel_nonmonotonic && 267 (level < imax(securelevel, pr->pr_securelevel))) { 268 mtx_unlock(&pr->pr_mtx); 269 return (EPERM); 270 } 271 pr->pr_securelevel = level; 272 mtx_unlock(&pr->pr_mtx); 273 } else { 274 mtx_lock(&securelevel_mtx); 275 if (!regression_securelevel_nonmonotonic && 276 (level < securelevel)) { 277 mtx_unlock(&securelevel_mtx); 278 return (EPERM); 279 } 280 securelevel = level; 281 mtx_unlock(&securelevel_mtx); 282 } 283 return (error); 284 } 285 286 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 287 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 288 "I", "Current secure level"); 289 290 char domainname[MAXHOSTNAMELEN]; 291 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 292 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 293 294 u_long hostid; 295 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 296 297 /* 298 * This is really cheating. These actually live in the libc, something 299 * which I'm not quite sure is a good idea anyway, but in order for 300 * getnext and friends to actually work, we define dummies here. 301 */ 302 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 303 "", 0, "PATH that finds all the standard utilities"); 304 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 305 0, 0, "Max ibase/obase values in bc(1)"); 306 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 307 0, 0, "Max array size in bc(1)"); 308 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 309 0, 0, "Max scale value in bc(1)"); 310 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 311 0, 0, "Max string length in bc(1)"); 312 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 313 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 314 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 315 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 316 0, 0, "Max length (bytes) of a text-processing utility's input line"); 317 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 318 0, 0, "Maximum number of repeats of a regexp permitted"); 319 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 320 0, 0, 321 "The version of POSIX 1003.2 with which the system attempts to comply"); 322 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 323 0, 0, "Whether C development supports the C bindings option"); 324 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 325 0, 0, "Whether system supports the C development utilities option"); 326 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 327 0, 0, ""); 328 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 329 0, 0, "Whether system supports FORTRAN development utilities"); 330 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 331 0, 0, "Whether system supports FORTRAN runtime utilities"); 332 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 333 0, 0, "Whether system supports creation of locales"); 334 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 335 0, 0, "Whether system supports software development utilities"); 336 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 337 0, 0, "Whether system supports the user portability utilities"); 338 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 339 0, 0, "Min Maximum number of streams a process may have open at one time"); 340 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 341 0, 0, "Min Maximum number of types supported for timezone names"); 342 343 #include <sys/vnode.h> 344 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 345 0, sizeof(struct vnode), "sizeof(struct vnode)"); 346 347 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 348 0, sizeof(struct proc), "sizeof(struct proc)"); 349 350 #include <sys/conf.h> 351 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 352 0, sizeof(struct cdev), "sizeof(struct cdev)"); 353 354 #include <sys/bio.h> 355 #include <sys/buf.h> 356 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 357 0, sizeof(struct bio), "sizeof(struct bio)"); 358 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 359 0, sizeof(struct buf), "sizeof(struct buf)"); 360 361 #include <sys/user.h> 362 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 363 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 364 365 /* XXX compatibility, remove for 6.0 */ 366 #include <sys/imgact.h> 367 #include <sys/imgact_elf.h> 368 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW, 369 &__elfN(fallback_brand), sizeof(__elfN(fallback_brand)), 370 "compatibility for kern.fallback_elf_brand"); 371