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_global.h" 44 #include "opt_posix.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/systm.h> 49 #include <sys/sysctl.h> 50 #include <sys/proc.h> 51 #include <sys/jail.h> 52 #include <sys/smp.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 #ifdef REGRESSION 80 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, 81 "Regression test MIB"); 82 #endif 83 84 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 85 osrelease, 0, "Operating system type"); 86 87 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 88 0, BSD, "Operating system revision"); 89 90 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 91 version, 0, "Kernel version"); 92 93 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 94 ostype, 0, "Operating system type"); 95 96 extern int osreldate; 97 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 98 &osreldate, 0, "Operating system release date"); 99 100 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 101 &maxproc, 0, "Maximum number of processes"); 102 103 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 104 &maxprocperuid, 0, "Maximum processes allowed per userid"); 105 106 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 107 &maxusers, 0, "Hint for kernel tuning"); 108 109 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 110 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 111 112 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 113 0, _KPOSIX_VERSION, "Version of POSIX attempting to comply to"); 114 115 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 116 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 117 118 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 119 0, 1, "Whether job control is available"); 120 121 #ifdef _POSIX_SAVED_IDS 122 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 123 0, 1, "Whether saved set-group/user ID is available"); 124 #else 125 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 126 0, 0, "Whether saved set-group/user ID is available"); 127 #endif 128 129 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 130 131 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 132 kernelname, sizeof kernelname, "Name of kernel file booted"); 133 134 #ifdef SMP 135 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 136 &mp_ncpus, 0, "Number of active CPUs"); 137 #else 138 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 139 0, 1, "Number of active CPUs"); 140 #endif 141 142 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 143 0, BYTE_ORDER, "System byte order"); 144 145 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 146 0, PAGE_SIZE, "System memory page size"); 147 148 static char machine_arch[] = MACHINE_ARCH; 149 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 150 machine_arch, 0, "System architecture"); 151 152 char hostname[MAXHOSTNAMELEN]; 153 154 static int 155 sysctl_hostname(SYSCTL_HANDLER_ARGS) 156 { 157 int error; 158 159 if (jailed(req->td->td_proc->p_ucred)) { 160 if (!jail_set_hostname_allowed && req->newptr) 161 return (EPERM); 162 error = sysctl_handle_string(oidp, 163 req->td->td_proc->p_ucred->cr_prison->pr_host, 164 sizeof req->td->td_proc->p_ucred->cr_prison->pr_host, req); 165 } else 166 error = sysctl_handle_string(oidp, 167 hostname, sizeof hostname, req); 168 return (error); 169 } 170 171 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 172 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON, 173 0, 0, sysctl_hostname, "A", "Hostname"); 174 175 #ifdef REGRESSION 176 static int regression_securelevel_nonmonotonic = 0; 177 178 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 179 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 180 #endif 181 182 int securelevel = -1; 183 184 static int 185 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 186 { 187 struct prison *pr; 188 int error, level; 189 190 pr = req->td->td_proc->p_ucred->cr_prison; 191 192 /* 193 * If the process is in jail, return the maximum of the global and 194 * local levels; otherwise, return the global level. 195 */ 196 if (pr != NULL) 197 level = imax(securelevel, pr->pr_securelevel); 198 else 199 level = securelevel; 200 error = sysctl_handle_int(oidp, &level, 0, req); 201 if (error || !req->newptr) 202 return (error); 203 /* 204 * Permit update only if the new securelevel exceeds the 205 * global level, and local level if any. 206 */ 207 if (pr != NULL) { 208 #ifdef REGRESSION 209 if (!regression_securelevel_nonmonotonic) 210 #endif 211 if (level < imax(securelevel, pr->pr_securelevel)) 212 return (EPERM); 213 pr->pr_securelevel = level; 214 } else { 215 #ifdef REGRESSION 216 if (!regression_securelevel_nonmonotonic) 217 #endif 218 if (level < securelevel) 219 return (EPERM); 220 securelevel = level; 221 } 222 return (error); 223 } 224 225 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 226 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 227 "I", "Current secure level"); 228 229 char domainname[MAXHOSTNAMELEN]; 230 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 231 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 232 233 u_long hostid; 234 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 235 236 /* 237 * This is really cheating. These actually live in the libc, something 238 * which I'm not quite sure is a good idea anyway, but in order for 239 * getnext and friends to actually work, we define dummies here. 240 */ 241 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 242 "", 0, "PATH that finds all the standard utilities"); 243 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 244 0, 0, "Max ibase/obase values in bc(1)"); 245 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 246 0, 0, "Max array size in bc(1)"); 247 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 248 0, 0, "Max scale value in bc(1)"); 249 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 250 0, 0, "Max string length in bc(1)"); 251 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 252 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 253 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 254 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 255 0, 0, "Max length (bytes) of a text-processing utility's input line"); 256 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 257 0, 0, "Maximum number of repeats of a regexp permitted"); 258 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 259 0, 0, 260 "The version of POSIX 1003.2 with which the system attempts to comply"); 261 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 262 0, 0, "Whether C development supports the C bindings option"); 263 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 264 0, 0, "Whether system supports the C development utilities option"); 265 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 266 0, 0, ""); 267 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 268 0, 0, "Whether system supports FORTRAN development utilities"); 269 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 270 0, 0, "Whether system supports FORTRAN runtime utilities"); 271 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 272 0, 0, "Whether system supports creation of locales"); 273 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 274 0, 0, "Whether system supports software development utilities"); 275 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 276 0, 0, "Whether system supports the user portability utilities"); 277 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 278 0, 0, "Min Maximum number of streams a process may have open at one time"); 279 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 280 0, 0, "Min Maximum number of types supported for timezone names"); 281 282 #include <sys/vnode.h> 283 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 284 0, sizeof(struct vnode), "sizeof(struct vnode)"); 285 286 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 287 0, sizeof(struct proc), "sizeof(struct proc)"); 288 289 #include <sys/conf.h> 290 SYSCTL_INT(_debug_sizeof, OID_AUTO, specinfo, CTLFLAG_RD, 291 0, sizeof(struct specinfo), "sizeof(struct specinfo)"); 292 293 #include <sys/bio.h> 294 #include <sys/buf.h> 295 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 296 0, sizeof(struct bio), "sizeof(struct bio)"); 297 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 298 0, sizeof(struct buf), "sizeof(struct buf)"); 299 300 #include <sys/user.h> 301 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 302 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 303