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/tls.h> 48 #include <machine/smp.h> 49 50 SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0, 51 "Sysctl internal magic"); 52 SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0, 53 "High kernel, proc, limits &c"); 54 SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0, 55 "Virtual memory"); 56 SYSCTL_NODE(, CTL_VFS, vfs, CTLFLAG_RW, 0, 57 "File system"); 58 SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0, 59 "Network, (see socket.h)"); 60 SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0, 61 "Debugging"); 62 SYSCTL_NODE(_debug, OID_AUTO, sizeof, CTLFLAG_RW, 0, 63 "Size of various kernel data structures"); 64 SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0, 65 "hardware"); 66 SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0, 67 "machine dependent"); 68 SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0, 69 "user-level"); 70 SYSCTL_NODE(, CTL_P1003_1B, p1003_1b, CTLFLAG_RW, 0, 71 "p1003_1b, (see p1003_1b.h)"); 72 SYSCTL_NODE(, CTL_LWKT, lwkt, CTLFLAG_RW, 0, 73 "light weight kernel threads"); 74 75 SYSCTL_NODE(, OID_AUTO, compat, CTLFLAG_RW, 0, 76 "Compatibility code"); 77 SYSCTL_NODE(, OID_AUTO, security, CTLFLAG_RW, 0, 78 "Security"); 79 80 SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD | CTLFLAG_NOLOCK, 81 kern_ident, 0, "Kernel identifier"); 82 83 SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD | CTLFLAG_NOLOCK, 84 osrelease, 0, "Operating system type"); 85 86 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 87 0, __DragonFly_version, "Operating system revision"); 88 89 SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD | CTLFLAG_NOLOCK, 90 version, 0, "Kernel version"); 91 92 SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_NOLOCK, 93 ostype, 0, "Operating system type"); 94 95 SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, 96 &osreldate, 0, "Operating system release date"); 97 98 static int tls_extra = RTLD_STATIC_TLS_EXTRA_DEFAULT; 99 SYSCTL_INT(_kern, KERN_STATIC_TLS_EXTRA, tls_extra, CTLFLAG_RW | CTLFLAG_NOLOCK, 100 &tls_extra, 0, "Extra static tls space for libraries"); 101 102 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, 103 &maxproc, 0, "Maximum number of processes"); 104 105 SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid, CTLFLAG_RW, 106 &maxprocperuid, 0, "Maximum processes allowed per userid"); 107 108 SYSCTL_INT(_kern, KERN_MAXPOSIXLOCKSPERUID, maxposixlocksperuid, CTLFLAG_RW, 109 &maxposixlocksperuid, 0, "Maximum number of POSIX-type locks per user id"); 110 111 SYSCTL_INT(_kern, OID_AUTO, maxusers, CTLFLAG_RD, 112 &maxusers, 0, "Hint for kernel tuning"); 113 114 SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 115 0, ARG_MAX, "Maximum bytes of argument to execve(2)"); 116 117 SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 118 0, _POSIX_VERSION, "Version of POSIX attempting to comply to"); 119 120 SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 121 0, NGROUPS_MAX, "Maximum number of groups a user can belong to"); 122 123 SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 124 0, 1, "Whether job control is available"); 125 126 #ifdef _POSIX_SAVED_IDS 127 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 128 0, 1, "Whether saved set-group/user ID is available"); 129 #else 130 SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 131 0, 0, "Whether saved set-group/user ID is available"); 132 #endif 133 134 char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ 135 136 SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, 137 kernelname, sizeof kernelname, "Name of kernel file booted"); 138 139 SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 140 &ncpus, 0, "Number of active CPUs"); 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 platform[] = MACHINE_PLATFORM; 149 SYSCTL_STRING(_hw, HW_MACHINE_PLATFORM, platform, CTLFLAG_RD | CTLFLAG_NOLOCK, 150 platform, 0, "Platform architecture"); 151 152 static char machine_arch[] = MACHINE_ARCH; 153 SYSCTL_STRING(_hw, HW_MACHINE_ARCH, machine_arch, CTLFLAG_RD | CTLFLAG_NOLOCK, 154 machine_arch, 0, "Cpu architecture"); 155 156 char hostname[MAXHOSTNAMELEN]; 157 158 /* 159 * Hostname sysctl handler. We use CTLFLAG_NOLOCK to avoid acquiring 160 * the per-oid lock. The per-cpu SLOCK is still acquired, so to interlock 161 * against setting the hostname we relock with XLOCK. The result is 162 * that the critical path (just reading the hostname) gets one less lock 163 * and will have improved performance. 164 */ 165 static int 166 sysctl_hostname(SYSCTL_HANDLER_ARGS) 167 { 168 struct thread *td = req->td; 169 struct proc *p = td ? td->td_proc : NULL; 170 struct prison *pr; 171 int error; 172 173 if (req->newptr) { 174 SYSCTL_SUNLOCK(); 175 SYSCTL_XLOCK(); 176 } 177 if (p) 178 pr = p->p_ucred->cr_prison; 179 if (p && pr) { 180 if (!PRISON_CAP_ISSET(pr->pr_caps, 181 PRISON_CAP_SYS_SET_HOSTNAME) && req->newptr) 182 return(EPERM); 183 error = sysctl_handle_string(oidp, 184 p->p_ucred->cr_prison->pr_host, 185 sizeof p->p_ucred->cr_prison->pr_host, req); 186 } else { 187 error = sysctl_handle_string(oidp, 188 hostname, sizeof hostname, req); 189 } 190 if (req->newptr) { 191 SYSCTL_XUNLOCK(); 192 SYSCTL_SLOCK(); 193 } 194 return (error); 195 } 196 197 SYSCTL_PROC(_kern, KERN_HOSTNAME, hostname, 198 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NOLOCK, 199 0, 0, sysctl_hostname, "A", "Hostname"); 200 201 int securelevel = -1; 202 int kernel_mem_readonly = 0; 203 204 static int 205 sysctl_kern_securelvl(SYSCTL_HANDLER_ARGS) 206 { 207 int error, level; 208 209 level = securelevel; 210 error = sysctl_handle_int(oidp, &level, 0, req); 211 if (error || !req->newptr) 212 return (error); 213 if (level < securelevel) 214 return (EPERM); 215 securelevel = level; 216 return (error); 217 } 218 219 SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW, 220 0, 0, sysctl_kern_securelvl, "I", "Current secure level"); 221 222 char domainname[MAXHOSTNAMELEN]; 223 SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW, 224 &domainname, sizeof(domainname), "Name of the current YP/NIS domain"); 225 226 unsigned long hostid; 227 SYSCTL_ULONG(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "Host ID"); 228 229 /* 230 * This is really cheating. These actually live in the libc, something 231 * which I'm not quite sure is a good idea anyway, but in order for 232 * getnext and friends to actually work, we define dummies here. 233 */ 234 SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RD, 235 "", 0, "PATH that finds all the standard utilities"); 236 SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RD, 237 0, 0, "Max ibase/obase values in bc(1)"); 238 SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RD, 239 0, 0, "Max array size in bc(1)"); 240 SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RD, 241 0, 0, "Max scale value in bc(1)"); 242 SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RD, 243 0, 0, "Max string length in bc(1)"); 244 SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RD, 245 0, 0, "Maximum number of weights assigned to an LC_COLLATE locale entry"); 246 SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RD, 0, 0, ""); 247 SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RD, 248 0, 0, "Max length (bytes) of a text-processing utility's input line"); 249 SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RD, 250 0, 0, "Maximum number of repeats of a regexp permitted"); 251 SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RD, 252 0, 0, 253 "The version of POSIX 1003.2 with which the system attempts to comply"); 254 SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RD, 255 0, 0, "Whether C development supports the C bindings option"); 256 SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RD, 257 0, 0, "Whether system supports the C development utilities option"); 258 SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RD, 259 0, 0, ""); 260 SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RD, 261 0, 0, "Whether system supports FORTRAN development utilities"); 262 SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RD, 263 0, 0, "Whether system supports FORTRAN runtime utilities"); 264 SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RD, 265 0, 0, "Whether system supports creation of locales"); 266 SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RD, 267 0, 0, "Whether system supports software development utilities"); 268 SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RD, 269 0, 0, "Whether system supports the user portability utilities"); 270 SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RD, 271 0, 0, "Min Maximum number of streams a process may have open at one time"); 272 SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RD, 273 0, 0, "Min Maximum number of types supported for timezone names"); 274 275 #include <sys/vnode.h> 276 SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, 277 0, sizeof(struct vnode), "sizeof(struct vnode)"); 278 279 SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 280 0, sizeof(struct proc), "sizeof(struct proc)"); 281 282 #include <sys/conf.h> 283 SYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 284 0, sizeof(struct cdev), "sizeof(struct cdev)"); 285 286 SYSCTL_NODE(_kern, OID_AUTO, features, CTLFLAG_RD, 0, "Kernel Features"); 287