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 (!pr->pr_set_hostname_allowed && req->newptr) 176 return(EPERM); 177 error = sysctl_handle_string(oidp, 178 p->p_ucred->cr_prison->pr_host, 179 sizeof p->p_ucred->cr_prison->pr_host, req); 180 } else { 181 error = sysctl_handle_string(oidp, 182 hostname, sizeof hostname, req); 183 } 184 if (req->newptr) { 185 SYSCTL_XUNLOCK(); 186 SYSCTL_SLOCK(); 187 } 188 return (error); 189 } 190 191 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 192 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NOLOCK, 193 0, 0, sysctl_hostname, "A", "Hostname"); 194 195 int securelevel = -1; 196 int kernel_mem_readonly = 0; 197 198 static int 199 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 200 { 201 int error, level; 202 203 level = securelevel; 204 error = sysctl_handle_int(oidp, &level, 0, req); 205 if (error || !req->newptr) 206 return (error); 207 if (level < securelevel) 208 return (EPERM); 209 securelevel = level; 210 return (error); 211 } 212 213 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW, 214 0, 0, sysctl_kern_securelvl, "I", "Current secure level"); 215 216 char domainname[MAXHOSTNAMELEN]; 217 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 218 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 219 220 unsigned long hostid; 221 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 222 223 /* 224 * This is really cheating. These actually live in the libc, something 225 * which I'm not quite sure is a good idea anyway, but in order for 226 * getnext and friends to actually work, we define dummies here. 227 */ 228 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 229 "", 0, "PATH that finds all the standard utilities"); 230 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 231 0, 0, "Max ibase/obase values in bc(1)"); 232 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 233 0, 0, "Max array size in bc(1)"); 234 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 235 0, 0, "Max scale value in bc(1)"); 236 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 237 0, 0, "Max string length in bc(1)"); 238 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 239 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 240 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 241 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 242 0, 0, "Max length (bytes) of a text-processing utility's input line"); 243 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 244 0, 0, "Maximum number of repeats of a regexp permitted"); 245 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 246 0, 0, 247 "The version of POSIX 1003.2 with which the system attempts to comply"); 248 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 249 0, 0, "Whether C development supports the C bindings option"); 250 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 251 0, 0, "Whether system supports the C development utilities option"); 252 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 253 0, 0, ""); 254 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 255 0, 0, "Whether system supports FORTRAN development utilities"); 256 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 257 0, 0, "Whether system supports FORTRAN runtime utilities"); 258 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 259 0, 0, "Whether system supports creation of locales"); 260 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 261 0, 0, "Whether system supports software development utilities"); 262 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 263 0, 0, "Whether system supports the user portability utilities"); 264 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 265 0, 0, "Min Maximum number of streams a process may have open at one time"); 266 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 267 0, 0, "Min Maximum number of types supported for timezone names"); 268 269 #include <sys/vnode.h> 270 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 271 0, sizeof(struct vnode), "sizeof(struct vnode)"); 272 273 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 274 0, sizeof(struct proc), "sizeof(struct proc)"); 275 276 #include <sys/conf.h> 277 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 278 0, sizeof(struct cdev), "sizeof(struct cdev)"); 279