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. 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 * $FreeBSD: src/sys/kern/kern_mib.c,v 1.29.2.4 2001/07/30 23:28:00 peter Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/sysctl.h> 43 #include <sys/proc.h> 44 #include <sys/lockf.h> 45 #include <sys/jail.h> 46 #include <sys/unistd.h> 47 #include <machine/smp.h> 48 49 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 50 "Sysctl internal magic"); 51 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 52 "High kernel, proc, limits &c"); 53 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 54 "Virtual memory"); 55 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 56 "File system"); 57 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 58 "Network, (see socket.h)"); 59 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 60 "Debugging"); 61 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 62 "Size of various kernel data structures"); 63 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 64 "hardware"); 65 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 66 "machine dependent"); 67 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 68 "user-level"); 69 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 70 "p1003_1b, (see p1003_1b.h)"); 71 SYSCTL_NODE(, CTL_LWKT, lwkt, CTLFLAG_RW, 0, 72 "light weight kernel threads"); 73 74 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 75 "Compatibility code"); 76 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 77 "Security"); 78 79 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD | CTLFLAG_NOLOCK, 80 kern_ident, 0, "Kernel identifier"); 81 82 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD | CTLFLAG_NOLOCK, 83 osrelease, 0, "Operating system type"); 84 85 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 86 0, __DragonFly_version, "Operating system revision"); 87 88 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD | CTLFLAG_NOLOCK, 89 version, 0, "Kernel version"); 90 91 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_NOLOCK, 92 ostype, 0, "Operating system type"); 93 94 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 95 &osreldate, 0, "Operating system release date"); 96 97 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 98 &maxproc, 0, "Maximum number of processes"); 99 100 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 101 &maxprocperuid, 0, "Maximum processes allowed per userid"); 102 103 SYSCTL_INT(_kern, KERN_MAXPOSIXLOCKSPERUID, maxposixlocksperuid, CTLFLAG_RW, 104 &maxposixlocksperuid, 0, "Maximum number of POSIX-type locks per user id"); 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, _POSIX_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 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 135 &ncpus, 0, "Number of active CPUs"); 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 platform[] = MACHINE_PLATFORM; 144 SYSCTL_STRING(_hw, HW_MACHINE_PLATFORM, platform, CTLFLAG_RD | CTLFLAG_NOLOCK, 145 platform, 0, "Platform architecture"); 146 147 static char machine_arch[] = MACHINE_ARCH; 148 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD | CTLFLAG_NOLOCK, 149 machine_arch, 0, "Cpu architecture"); 150 151 char hostname[MAXHOSTNAMELEN]; 152 153 /* 154 * Hostname sysctl handler. We use CTLFLAG_NOLOCK to avoid acquiring 155 * the per-oid lock. The per-cpu SLOCK is still acquired, so to interlock 156 * against setting the hostname we relock with XLOCK. The result is 157 * that the critical path (just reading the hostname) gets one less lock 158 * and will have improved performance. 159 */ 160 static int 161 sysctl_hostname(SYSCTL_HANDLER_ARGS) 162 { 163 struct thread *td = req->td; 164 struct proc *p = td ? td->td_proc : NULL; 165 struct prison *pr; 166 int error; 167 168 if (req->newptr) { 169 SYSCTL_SUNLOCK(); 170 SYSCTL_XLOCK(); 171 } 172 if (p) 173 pr = p->p_ucred->cr_prison; 174 if (p && pr) { 175 if (!PRISON_CAP_ISSET(pr->pr_caps, 176 PRISON_CAP_SYS_SET_HOSTNAME) && req->newptr) 177 return(EPERM); 178 error = sysctl_handle_string(oidp, 179 p->p_ucred->cr_prison->pr_host, 180 sizeof p->p_ucred->cr_prison->pr_host, req); 181 } else { 182 error = sysctl_handle_string(oidp, 183 hostname, sizeof hostname, req); 184 } 185 if (req->newptr) { 186 SYSCTL_XUNLOCK(); 187 SYSCTL_SLOCK(); 188 } 189 return (error); 190 } 191 192 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 193 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NOLOCK, 194 0, 0, sysctl_hostname, "A", "Hostname"); 195 196 int securelevel = -1; 197 int kernel_mem_readonly = 0; 198 199 static int 200 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 201 { 202 int error, level; 203 204 level = securelevel; 205 error = sysctl_handle_int(oidp, &level, 0, req); 206 if (error || !req->newptr) 207 return (error); 208 if (level < securelevel) 209 return (EPERM); 210 securelevel = level; 211 return (error); 212 } 213 214 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW, 215 0, 0, sysctl_kern_securelvl, "I", "Current secure level"); 216 217 char domainname[MAXHOSTNAMELEN]; 218 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 219 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 220 221 unsigned long hostid; 222 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 223 224 /* 225 * This is really cheating. These actually live in the libc, something 226 * which I'm not quite sure is a good idea anyway, but in order for 227 * getnext and friends to actually work, we define dummies here. 228 */ 229 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 230 "", 0, "PATH that finds all the standard utilities"); 231 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 232 0, 0, "Max ibase/obase values in bc(1)"); 233 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 234 0, 0, "Max array size in bc(1)"); 235 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 236 0, 0, "Max scale value in bc(1)"); 237 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 238 0, 0, "Max string length in bc(1)"); 239 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 240 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 241 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 242 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 243 0, 0, "Max length (bytes) of a text-processing utility's input line"); 244 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 245 0, 0, "Maximum number of repeats of a regexp permitted"); 246 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 247 0, 0, 248 "The version of POSIX 1003.2 with which the system attempts to comply"); 249 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 250 0, 0, "Whether C development supports the C bindings option"); 251 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 252 0, 0, "Whether system supports the C development utilities option"); 253 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 254 0, 0, ""); 255 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 256 0, 0, "Whether system supports FORTRAN development utilities"); 257 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 258 0, 0, "Whether system supports FORTRAN runtime utilities"); 259 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 260 0, 0, "Whether system supports creation of locales"); 261 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 262 0, 0, "Whether system supports software development utilities"); 263 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 264 0, 0, "Whether system supports the user portability utilities"); 265 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 266 0, 0, "Min Maximum number of streams a process may have open at one time"); 267 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 268 0, 0, "Min Maximum number of types supported for timezone names"); 269 270 #include <sys/vnode.h> 271 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 272 0, sizeof(struct vnode), "sizeof(struct vnode)"); 273 274 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 275 0, sizeof(struct proc), "sizeof(struct proc)"); 276 277 #include <sys/conf.h> 278 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 279 0, sizeof(struct cdev), "sizeof(struct cdev)"); 280