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