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 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/jail.h> 51 #include <sys/smp.h> 52 53 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 54 "Sysctl internal magic"); 55 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 56 "High kernel, proc, limits &c"); 57 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 58 "Virtual memory"); 59 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 60 "File system"); 61 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 62 "Network, (see socket.h)"); 63 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 64 "Debugging"); 65 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 66 "Sizeof various things"); 67 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 68 "hardware"); 69 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 70 "machine dependent"); 71 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 72 "user-level"); 73 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 74 "p1003_1b, (see p1003_1b.h)"); 75 76 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 77 "Compatibility code"); 78 79 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, 80 osrelease, 0, "Operating system type"); 81 82 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 83 0, BSD, "Operating system revision"); 84 85 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, 86 version, 0, "Kernel version"); 87 88 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, 89 ostype, 0, "Operating system type"); 90 91 extern int osreldate; 92 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 93 &osreldate, 0, "Operating system release date"); 94 95 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 96 &maxproc, 0, "Maximum number of processes"); 97 98 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 99 &maxprocperuid, 0, "Maximum processes allowed per userid"); 100 101 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 102 &maxusers, 0, "Hint for kernel tuning"); 103 104 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 105 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 106 107 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 108 0, _KPOSIX_VERSION, "Version of POSIX attempting to comply to"); 109 110 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 111 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 112 113 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 114 0, 1, "Whether job control is available"); 115 116 #ifdef _POSIX_SAVED_IDS 117 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 118 0, 1, "Whether saved set-group/user ID is available"); 119 #else 120 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 121 0, 0, "Whether saved set-group/user ID is available"); 122 #endif 123 124 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 125 126 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 127 kernelname, sizeof kernelname, "Name of kernel file booted"); 128 129 #ifdef SMP 130 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 131 &mp_ncpus, 0, "Number of active CPUs"); 132 #else 133 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 134 0, 1, "Number of active CPUs"); 135 #endif 136 137 SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 138 0, BYTE_ORDER, "System byte order"); 139 140 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 141 0, PAGE_SIZE, "System memory page size"); 142 143 static char machine_arch[] = MACHINE_ARCH; 144 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD, 145 machine_arch, 0, "System architecture"); 146 147 #ifdef REGRESSION 148 SYSCTL_NODE(, OID_AUTO, regression, CTLFLAG_RW, 0, "Regression test MIB"); 149 #endif /* !REGRESSION */ 150 151 char hostname[MAXHOSTNAMELEN]; 152 153 static int 154 sysctl_hostname(SYSCTL_HANDLER_ARGS) 155 { 156 int error; 157 158 if (jailed(req->p->p_ucred)) { 159 if (!jail_set_hostname_allowed && req->newptr) 160 return(EPERM); 161 error = sysctl_handle_string(oidp, 162 req->p->p_ucred->cr_prison->pr_host, 163 sizeof req->p->p_ucred->cr_prison->pr_host, req); 164 } else 165 error = sysctl_handle_string(oidp, 166 hostname, sizeof hostname, req); 167 return (error); 168 } 169 170 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 171 CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_PRISON, 172 0, 0, sysctl_hostname, "A", "Hostname"); 173 174 #ifdef REGRESSION 175 int regression_securelevel_nonmonotonic=0; 176 177 SYSCTL_INT(_regression, OID_AUTO, securelevel_nonmonotonic, CTLFLAG_RW, 178 ®ression_securelevel_nonmonotonic, 0, "securelevel may be lowered"); 179 #endif /* !REGRESSION */ 180 181 int securelevel = -1; 182 183 static int 184 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 185 { 186 int error, level; 187 188 /* 189 * If the process is in jail, return the maximum of the 190 * global and local levels; otherwise, return the global 191 * level. 192 */ 193 if (req->p->p_ucred->cr_prison != NULL) 194 level = imax(securelevel, 195 req->p->p_ucred->cr_prison->pr_securelevel); 196 else 197 level = securelevel; 198 error = sysctl_handle_int(oidp, &level, 0, req); 199 if (error || !req->newptr) 200 return (error); 201 /* 202 * Permit update only if the new securelevel exceeds the 203 * global level, and local level if any. 204 */ 205 if (req->p->p_ucred->cr_prison != NULL) { 206 #ifdef REGRESSION 207 if (!regression_securelevel_nonmonotonic) 208 #endif /* !REGRESSION */ 209 if (level < imax(securelevel, 210 req->p->p_ucred->cr_prison->pr_securelevel)) 211 return (EPERM); 212 req->p->p_ucred->cr_prison->pr_securelevel = level; 213 } else { 214 #ifdef REGRESSION 215 if (!regression_securelevel_nonmonotonic) 216 #endif /* !REGRESSION */ 217 if (level < securelevel) 218 return (EPERM); 219 securelevel = level; 220 } 221 return (error); 222 } 223 224 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, 225 CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, sysctl_kern_securelvl, 226 "I", "Current secure level"); 227 228 char domainname[MAXHOSTNAMELEN]; 229 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 230 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 231 232 unsigned long hostid; 233 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 234 235 /* 236 * This is really cheating. These actually live in the libc, something 237 * which I'm not quite sure is a good idea anyway, but in order for 238 * getnext and friends to actually work, we define dummies here. 239 */ 240 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 241 "", 0, "PATH that finds all the standard utilities"); 242 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 243 0, 0, "Max ibase/obase values in bc(1)"); 244 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 245 0, 0, "Max array size in bc(1)"); 246 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 247 0, 0, "Max scale value in bc(1)"); 248 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 249 0, 0, "Max string length in bc(1)"); 250 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 251 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 252 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 253 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 254 0, 0, "Max length (bytes) of a text-processing utility's input line"); 255 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 256 0, 0, "Maximum number of repeats of a regexp permitted"); 257 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 258 0, 0, 259 "The version of POSIX 1003.2 with which the system attempts to comply"); 260 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 261 0, 0, "Whether C development supports the C bindings option"); 262 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 263 0, 0, "Whether system supports the C development utilities option"); 264 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 265 0, 0, ""); 266 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 267 0, 0, "Whether system supports FORTRAN development utilities"); 268 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 269 0, 0, "Whether system supports FORTRAN runtime utilities"); 270 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 271 0, 0, "Whether system supports creation of locales"); 272 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 273 0, 0, "Whether system supports software development utilities"); 274 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 275 0, 0, "Whether system supports the user portability utilities"); 276 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 277 0, 0, "Min Maximum number of streams a process may have open at one time"); 278 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 279 0, 0, "Min Maximum number of types supported for timezone names"); 280 281 #include <sys/vnode.h> 282 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 283 0, sizeof(struct vnode), "sizeof(struct vnode)"); 284 285 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 286 0, sizeof(struct proc), "sizeof(struct proc)"); 287 288 #include <sys/conf.h> 289 SYSCTL_INT(_debug_sizeof, OID_AUTO, specinfo, CTLFLAG_RD, 290 0, sizeof(struct specinfo), "sizeof(struct specinfo)"); 291 292 #include <sys/bio.h> 293 #include <sys/buf.h> 294 SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, 295 0, sizeof(struct bio), "sizeof(struct bio)"); 296 SYSCTL_INT(_debug_sizeof, OID_AUTO, buf, CTLFLAG_RD, 297 0, sizeof(struct buf), "sizeof(struct buf)"); 298 299 #include <sys/user.h> 300 SYSCTL_INT(_debug_sizeof, OID_AUTO, kinfo_proc, CTLFLAG_RD, 301 0, sizeof(struct kinfo_proc), "sizeof(struct kinfo_proc)"); 302