Annotation of src/share/man/man7/sysctl.7, Revision 1.73
1.73 ! christos 1: .\" $NetBSD: sysctl.7,v 1.72 2012/06/22 14:54:35 christos Exp $
1.1 pavel 2: .\"
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1.73 ! christos 32: .Dd June 22, 2012
1.1 pavel 33: .Dt SYSCTL 7
34: .Os
35: .Sh NAME
36: .Nm sysctl
37: .Nd system information variables
38: .Sh DESCRIPTION
39: The
40: .Xr sysctl 3
41: library function and the
42: .Xr sysctl 8
43: utility are used to get and set values of system variables, maintained
44: by the kernel.
45: The variables are organized in a tree and identified by a sequence of
46: numbers, conventionally separated by dots with the topmost identifier
47: at the left side.
48: The numbers have corresponding text names.
49: The
50: .Xr sysctlnametomib 3
51: function or the
52: .Fl M
53: argument to the
54: .Xr sysctl 8
55: utility can be used to convert the text representation to the
56: numeric one.
57: .Pp
58: The individual sysctl variables are described below, both the textual
59: and numeric form where applicable.
60: The textual names can be used as argument to the
61: .Xr sysctl 8
62: utility and in the file
63: .Pa /etc/sysctl.conf .
64: The numeric names are usually defined as preprocessor constants and
65: are intended for use by programs.
66: Every such constant expands to one integer, which identifies the
67: sysctl variable relative to the upper level of the tree.
68: See the
69: .Xr sysctl 3
70: manual page for programming examples.
1.50 jruoho 71: .Ss Top level names
1.56 uwe 72: The top level names are defined with a
73: .Va CTL_
74: prefix in
1.33 joerg 75: .In sys/sysctl.h ,
1.1 pavel 76: and are as follows.
77: The next and subsequent levels down are found in the include files
78: listed here, and described in separate sections below.
1.56 uwe 79: .Bl -column "security" ".Dv CTL_SECURITY" ".In uvm/uvm_param.h" "High kernel limits"
80: .It Sy Name Ta Sy Constant Ta Sy Next level names Ta Sy Description
81: .It kern Ta Dv CTL_KERN Ta In sys/sysctl.h Ta High kernel limits
82: .It vm Ta Dv CTL_VM Ta In uvm/uvm_param.h Ta Virtual memory
83: .It vfs Ta Dv CTL_VFS Ta In sys/mount.h Ta Filesystem
84: .It net Ta Dv CTL_NET Ta In sys/socket.h Ta Networking
85: .It debug Ta Dv CTL_DEBUG Ta In sys/sysctl.h Ta Debugging
86: .It hw Ta Dv CTL_HW Ta In sys/sysctl.h Ta Generic CPU, I/O
87: .It machdep Ta Dv CTL_MACHDEP Ta In sys/sysctl.h Ta Machine dependent
88: .It user Ta Dv CTL_USER Ta In sys/sysctl.h Ta User-level
89: .It ddb Ta Dv CTL_DDB Ta In sys/sysctl.h Ta In-kernel debugger
90: .It proc Ta Dv CTL_PROC Ta In sys/sysctl.h Ta Per-process
91: .It vendor Ta Dv CTL_VENDOR Ta ? Ta Vendor specific
92: .It emul Ta Dv CTL_EMUL Ta In sys/sysctl.h Ta Emulation settings
93: .It security Ta Dv CTL_SECURITY Ta In sys/sysctl.h Ta Security settings
1.1 pavel 94: .El
1.50 jruoho 95: .Ss The debug.* subtree
1.1 pavel 96: The debugging variables vary from system to system.
97: A debugging variable may be added or deleted without need to recompile
98: .Nm
99: to know about it.
100: Each time it runs,
101: .Nm
102: gets the list of debugging variables from the kernel and
103: displays their current values.
104: The system defines twenty
1.56 uwe 105: .Vt ( struct ctldebug )
1.1 pavel 106: variables named
107: .Dv debug0
108: through
109: .Dv debug19 .
110: They are declared as separate variables so that they can be
111: individually initialized at the location of their associated variable.
112: The loader prevents multiple use of the same variable by issuing errors
113: if a variable is initialized in more than one place.
114: For example, to export the variable
1.56 uwe 115: .Va dospecialcheck
1.1 pavel 116: as a debugging variable, the following declaration would be used:
1.43 jruoho 117: .Pp
1.1 pavel 118: .Bd -literal -offset indent -compact
119: int dospecialcheck = 1;
120: struct ctldebug debug5 = { "dospecialcheck", \*[Am]dospecialcheck };
121: .Ed
122: .Pp
123: Note that the dynamic implementation of
124: .Nm
125: currently in use largely makes this particular
126: .Nm
127: interface obsolete.
128: See
129: .Xr sysctl 8
130: .\" and
131: .\" .Xr sysctl 9
132: for more information.
1.50 jruoho 133: .Ss The vfs.* subtree
1.1 pavel 134: A distinguished second level name,
135: .Li vfs.generic ( VFS_GENERIC ) ,
1.57 wiz 136: is used to get general information about all file systems.
1.26 elad 137: It has the following third level identifiers:
1.56 uwe 138: .Bl -tag -width "123456"
139: .It Li vfs.generic.maxtypenum ( VFS_MAXTYPENUM )
1.57 wiz 140: The highest valid file system type number.
1.56 uwe 141: .It Li vfs.generic.conf ( VFS_CONF )
1.57 wiz 142: Returns configuration information about the file system type given as a fourth
1.26 elad 143: level identifier.
1.59 christos 144: .It Li vfs.generic.usermount ( VFS_USERMOUNT )
1.68 jym 145: Determines if non superuser mounts are allowed, defaults to
1.59 christos 146: .Dv 0 .
147: .It Li vfs.generic.magiclinks ( VFS_MAGICLINKS )
148: Controls if expansion of variables is going to be performed on pathnames
149: or not.
150: Defaults to no variable expansion,
151: .Dv 0 .
152: Variables are of the form
153: .Li @name
1.60 christos 154: and the variables supported are described in
155: .Xr symlink 7
156: under
157: .Dq "MAGIC SYMLINKS" .
1.26 elad 158: .El
159: .Pp
1.54 christos 160: A second level name for controlling the
161: .Xr wapbl 4
162: (Write Ahead Physical Block Logging file system journalling)
163: capabilities with the following third level identifiers:
1.56 uwe 164: .Bl -tag -width "123456"
165: .It Li vfs.wapbl.flush_disk_cache
1.55 wiz 166: Controls whether to attempt to flush the disk cache on each commit.
1.54 christos 167: It defaults to 1 and it should always be on to ensure data integrity in
168: case of a crash.
169: For slow disks, turning it off can improve performance.
1.56 uwe 170: .It Li vfs.wapbl.verbose_commit
1.55 wiz 171: For each transaction log commit, print the number of bytes written
172: and the time it took to commit as seconds.nanoseconds.
1.54 christos 173: .El
174: .Pp
1.57 wiz 175: The remaining second level identifiers are the file system names, identified
1.26 elad 176: by the type number returned by a
1.1 pavel 177: .Xr statvfs 2
178: call or from
1.27 wiz 179: .Li vfs.generic.conf .
1.56 uwe 180: .Pp
1.57 wiz 181: The third level identifiers available for each file system
1.1 pavel 182: are given in the header file that defines the mount
1.57 wiz 183: argument structure for that file system.
1.50 jruoho 184: .Ss The hw.* subtree
1.1 pavel 185: The string and integer information available for the
186: .Li hw
187: level is detailed below.
188: The changeable column shows whether a process with appropriate
189: privilege may change the value.
1.37 jruoho 190: .Bl -column "hw.machine_arch" "integer" "Changeable" -offset indent
1.1 pavel 191: .It Sy Second level name Type Changeable
192: .It hw.alignbytes integer no
193: .It hw.byteorder integer no
194: .It hw.cnmagic string yes
195: .It hw.disknames string no
196: .It hw.diskstats struct no
197: .It hw.machine string no
198: .It hw.machine_arch string no
199: .It hw.model string no
200: .It hw.ncpu integer no
201: .It hw.pagesize integer no
202: .It hw.physmem integer no
203: .It hw.physmem64 quad no
204: .It hw.usermem integer no
205: .It hw.usermem64 quad no
206: .El
207: .Pp
208: .Bl -tag -width "123456"
209: .It Li hw.alignbytes ( HW_ALIGNBYTES )
210: Alignment constraint for all possible data types.
211: This shows the value
212: .Dv ALIGNBYTES
213: in
1.56 uwe 214: .In machine/param.h ,
1.1 pavel 215: at the kernel compilation time.
216: .It Li hw.byteorder ( HW_BYTEORDER )
1.56 uwe 217: The byteorder (4321, or 1234).
1.1 pavel 218: .It Li hw.cnmagic ( HW_CNMAGIC )
219: The console magic key sequence.
220: .It Li hw.disknames ( HW_DISKNAMES )
221: The list of (space separated) disk device names on the system.
222: .It Li hw.iostatnames ( HW_IOSTATNAMES )
223: A space separated list of devices that will have I/O statistics
224: collected on them.
225: .It Li hw.iostats ( HW_IOSTATS )
226: Return statistical information on the NFS mounts, disk and tape
227: devices on the system.
228: An array of
1.56 uwe 229: .Vt struct io_sysctl
1.1 pavel 230: structures is returned,
231: whose size depends on the current number of such objects in the system.
232: The third level name is the size of the
1.56 uwe 233: .Vt struct io_sysctl .
1.1 pavel 234: The type of object can be determined by examining the
235: .Va type
236: element of
1.56 uwe 237: .Vt struct io_sysctl .
1.1 pavel 238: Which can be
239: .Dv IOSTAT_DISK
240: (disk drive),
241: .Dv IOSTAT_TAPE
242: (tape drive), or
243: .Dv IOSTAT_NFS
244: (NFS mount).
245: .It Li hw.machine ( HW_MACHINE )
246: The machine class.
247: .It Li hw.machine_arch ( HW_MACHINE_ARCH )
248: The machine CPU class.
249: .It Li hw.model ( HW_MODEL )
250: The machine model.
251: .It Li hw.ncpu ( HW_NCPU )
252: The number of CPUs.
253: .It Li hw.pagesize ( HW_PAGESIZE )
254: The software page size.
255: .It Li hw.physmem ( HW_PHYSMEM )
256: The bytes of physical memory as a 32-bit integer.
257: .It Li hw.physmem64 ( HW_PHYSMEM64 )
258: The bytes of physical memory as a 64-bit integer.
259: .It Li hw.usermem ( HW_USERMEM )
260: The bytes of non-kernel memory as a 32-bit integer.
261: .It Li hw.usermem64 ( HW_USERMEM64 )
262: The bytes of non-kernel memory as a 64-bit integer.
263: .El
1.50 jruoho 264: .Ss The kern.* subtree
1.43 jruoho 265: This subtree includes data generally related to the kernel.
1.1 pavel 266: The string and integer information available for the
267: .Li kern
268: level is detailed below.
269: The changeable column shows whether a process with appropriate
270: privilege may change the value.
1.43 jruoho 271: .Bl -column "kern.posix_reader_writer_locks" \
272: "struct kinfo_drivers" "not applicable"
1.1 pavel 273: .It Sy Second level name Type Changeable
1.51 jruoho 274: .It kern.aio_listio_max integer yes
275: .It kern.aio_max integer yes
1.44 jruoho 276: .It kern.arandom integer no
1.1 pavel 277: .It kern.argmax integer no
1.39 jruoho 278: .It kern.boothowto integer no
1.1 pavel 279: .It kern.boottime struct timeval no
1.39 jruoho 280: .\".It kern.bufq node not applicable
1.1 pavel 281: .It kern.ccpu integer no
282: .It kern.clockrate struct clockinfo no
283: .It kern.consdev integer no
1.39 jruoho 284: .It kern.coredump node not applicable
1.21 joerg 285: .It kern.cp_id struct no
286: .It kern.cp_time uint64_t[\|] no
1.46 jruoho 287: .It kern.cryptodevallowsoft integer yes
1.1 pavel 288: .It kern.defcorename string yes
1.38 jruoho 289: .It kern.detachall integer yes
1.1 pavel 290: .It kern.domainname string yes
291: .It kern.drivers struct kinfo_drivers no
1.39 jruoho 292: .It kern.dump_on_panic integer yes
1.1 pavel 293: .It kern.file struct file no
294: .It kern.forkfsleep integer yes
295: .It kern.fscale integer no
296: .It kern.fsync integer no
1.21 joerg 297: .It kern.hardclock_ticks integer no
1.1 pavel 298: .It kern.hostid integer yes
299: .It kern.hostname string yes
1.21 joerg 300: .It kern.iov_max integer no
1.39 jruoho 301: .It kern.ipc node not applicable
1.21 joerg 302: .It kern.job_control integer no
1.1 pavel 303: .It kern.labeloffset integer no
304: .It kern.labelsector integer no
1.21 joerg 305: .It kern.login_name_max integer no
1.1 pavel 306: .It kern.logsigexit integer yes
1.21 joerg 307: .It kern.mapped_files integer no
1.1 pavel 308: .It kern.maxfiles integer yes
1.70 christos 309: .It kern.maxlwp integer yes
1.1 pavel 310: .It kern.maxpartitions integer no
311: .It kern.maxphys integer no
312: .It kern.maxproc integer yes
313: .It kern.maxptys integer yes
314: .It kern.maxvnodes integer yes
315: .It kern.mbuf node not applicable
316: .It kern.memlock integer no
1.21 joerg 317: .It kern.memlock_range integer no
318: .It kern.memory_protection integer no
1.42 jruoho 319: .It kern.module node not applicable
1.21 joerg 320: .It kern.monotonic_clock integer no
1.49 jruoho 321: .It kern.mqueue node not applicable
1.1 pavel 322: .It kern.msgbuf integer no
323: .It kern.msgbufsize integer no
324: .It kern.ngroups integer no
1.41 jruoho 325: .\".It kern.no_sa_support integer yes
1.1 pavel 326: .It kern.ntptime struct ntptimeval no
327: .It kern.osrelease string no
1.39 jruoho 328: .It kern.osrevision integer no
1.1 pavel 329: .It kern.ostype string no
1.41 jruoho 330: .\".It kern.panic_now integer yes
1.1 pavel 331: .It kern.pipe node not applicable
1.39 jruoho 332: .\" .It kern.posix node not applicable
333: .It kern.posix1version integer no
1.51 jruoho 334: .It kern.posix_aio integer no
1.21 joerg 335: .It kern.posix_barriers integer no
336: .It kern.posix_reader_writer_locks integer no
1.39 jruoho 337: .\".It kern.posix_sched integer yes
1.21 joerg 338: .It kern.posix_semaphores integer no
339: .It kern.posix_spin_locks integer no
340: .It kern.posix_threads integer no
341: .It kern.posix_timers integer no
1.1 pavel 342: .It kern.proc struct kinfo_proc no
343: .It kern.proc2 struct kinfo_proc2 no
1.21 joerg 344: .It kern.proc_args string no
1.39 jruoho 345: .It kern.profiling node not applicable
1.41 jruoho 346: .\".It kern.pset node not applicable
1.1 pavel 347: .It kern.rawpartition integer no
1.21 joerg 348: .It kern.root_device string no
349: .It kern.root_partition integer no
350: .It kern.rtc_offset integer yes
351: .It kern.saved_ids integer no
1.39 jruoho 352: .It kern.sbmax integer yes
1.41 jruoho 353: .\".It kern.sched node not applicable
1.1 pavel 354: .It kern.securelevel integer raise only
1.39 jruoho 355: .It kern.somaxkva integer yes
1.21 joerg 356: .It kern.synchronized_io integer no
1.19 christos 357: .It kern.timecounter node not applicable
1.1 pavel 358: .It kern.timex struct no
359: .It kern.tkstat node not applicable
1.66 christos 360: .It kern.tty node not applicable
1.1 pavel 361: .It kern.urandom integer no
1.45 jruoho 362: .It kern.usercrypto integer yes
363: .It kern.userasymcrypto integer yes
1.39 jruoho 364: .It kern.veriexec node not applicable
1.1 pavel 365: .It kern.version string no
366: .It kern.vnode struct vnode no
367: .El
368: .Bl -tag -width "123456"
1.51 jruoho 369: .It Li kern.aio_listio_max
370: The maximum number of asynchronous
371: .Tn I/O
372: operations in a single list I/O call.
373: Like with all variables related to
374: .Xr aio 3 ,
375: the variable may be created and removed dynamically
376: upon loading or unloading the corresponding kernel module.
377: .It Li kern.aio_max
378: The maximum number of asynchronous I/O operations.
1.44 jruoho 379: .It Li kern.arandom
380: This variable picks a random number each time it is queried.
381: The used random number generator
1.56 uwe 382: .Pf ( Tn RNG )
1.44 jruoho 383: is based on
384: .Xr arc4random 3 .
1.1 pavel 385: .It Li kern.argmax ( KERN_ARGMAX )
386: The maximum bytes of argument to
387: .Xr execve 2 .
1.23 apb 388: .It Li kern.boothowto
389: Flags passed from the boot loader; see
390: .Xr reboot 2
391: for the meanings of the flags.
1.1 pavel 392: .It Li kern.boottime ( KERN_BOOTTIME )
393: A
1.56 uwe 394: .Vt struct timeval
1.1 pavel 395: structure is returned.
396: This structure contains the time that the system was booted.
1.41 jruoho 397: .\" .It Li kern.bufq
398: .\" XXX: Undocumented.
1.1 pavel 399: .It Li kern.ccpu ( KERN_CCPU )
400: The scheduler exponential decay value.
401: .It Li kern.clockrate ( KERN_CLOCKRATE )
402: A
1.56 uwe 403: .Vt struct clockinfo
1.1 pavel 404: structure is returned.
405: This structure contains the clock, statistics clock and profiling clock
406: frequencies, the number of micro-seconds per hz tick, and the clock
407: skew rate.
1.36 jruoho 408: Refer to
409: .Xr hz 9
410: for additional details.
1.1 pavel 411: .It Li kern.consdev ( KERN_CONSDEV )
412: Console device.
1.39 jruoho 413: .It Li kern.coredump
414: Settings related to set-id processes coredumps.
415: By default, set-id processes do not dump core in situations where
416: other processes would.
417: The settings in this node allows an administrator to change this
418: behavior.
419: .Pp
420: The third level name is
421: .Dv kern.coredump.setid
1.40 jruoho 422: and fourth level variables are described below.
423: .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent
424: .It Sy Fourth level name Type Changeable
425: .It kern.coredump.setid.dump integer yes
426: .It kern.coredump.setid.group integer yes
427: .It kern.coredump.setid.mode integer yes
428: .It kern.coredump.setid.owner integer yes
429: .It kern.coredump.setid.path string yes
430: .El
1.39 jruoho 431: .Bl -tag -width "123456"
432: .It Li kern.coredump.setid.dump
433: If non-zero, set-id processes will dump core.
434: .It Li kern.coredump.setid.group
435: The group-id for the set-id processes' coredump.
436: .It Li kern.coredump.setid.mode
437: The mode for the set-id processes' coredump.
438: See
439: .Xr chmod 1 .
440: .It Li kern.coredump.setid.owner
441: The user-id that will be used as the owner of the set-id processes'
442: coredump.
443: .It Li kern.coredump.setid.path
444: The path to which set-id processes' coredumps will be saved to.
445: Same syntax as kern.defcorename.
446: .El
1.1 pavel 447: .It Li kern.cp_id ( KERN_CP_ID )
448: Mapping of CPU number to CPU id.
449: .It Li kern.cp_time ( KERN_CP_TIME )
1.56 uwe 450: Returns an array of
451: .Dv CPUSTATES
452: .Vt uint64_t Ns s.
1.1 pavel 453: This array contains the
454: number of clock ticks spent in different CPU states.
455: On multi-processor systems, the sum across all CPUs is returned unless
456: appropriate space is given for one data set for each CPU.
457: Data for a specific CPU can also be obtained by adding the number of the
458: CPU at the end of the MIB, enlarging it by one.
1.46 jruoho 459: .It Li kern.cryptodevallowsoft
460: This variable controls userland access to hardware versus software transforms
461: in the
462: .Xr crypto 4
463: system.
464: The available values are as follows:
1.47 wiz 465: .Bl -tag -width XX0 -offset indent
466: .It Dv \*[Lt] 0
1.46 jruoho 467: Always force userlevel requests to use software transforms.
468: .It Dv = 0
469: If present, use hardware and grant userlevel requests for
470: non-accelerated transforms (handling the latter in software).
1.47 wiz 471: .It Dv \*[Gt] 0
1.46 jruoho 472: Allow user requests only for transforms which are hardware-accelerated.
473: .El
1.1 pavel 474: .It Li kern.defcorename ( KERN_DEFCORENAME )
475: Default template for the name of core dump files (see also
476: .Li proc.pid.corename
477: in the per-process variables
478: .Li proc.* ,
479: and
480: .Xr core 5
481: for format of this template).
482: The default value is
1.56 uwe 483: .Pa %n.core
1.1 pavel 484: and can be changed with the kernel configuration option
485: .Cd options DEFCORENAME
486: (see
487: .Xr options 4
488: ).
1.38 jruoho 489: .It Li kern.detachall
490: Detach all devices at shutdown.
1.1 pavel 491: .It Li kern.domainname ( KERN_DOMAINNAME )
492: Get or set the YP domain name.
493: .It Li kern.drivers ( KERN_DRIVERS )
494: Return an array of
1.56 uwe 495: .Vt struct kinfo_drivers
1.1 pavel 496: that contains the name and major device numbers of all the device drivers
497: in the current kernel.
498: The
499: .Va d_name
500: field is always a NUL terminated string.
501: The
502: .Va d_bmajor
503: field will be set to \-1 if the driver doesn't have a block device.
1.39 jruoho 504: .It Li kern.dump_on_panic ( KERN_DUMP_ON_PANIC )
1.41 jruoho 505: Perform a crash dump on system
506: .Xr panic 9 .
1.1 pavel 507: .It Li kern.file ( KERN_FILE )
508: Return the entire file table.
509: The returned data consists of a single
1.56 uwe 510: .Vt struct filelist
1.1 pavel 511: followed by an array of
1.56 uwe 512: .Vt struct file ,
1.1 pavel 513: whose size depends on the current number of such objects in the system.
514: .It Li kern.forkfsleep ( KERN_FORKFSLEEP )
515: If
516: .Xr fork 2
517: system call fails due to limit on number of processes (either
518: the global maxproc limit or user's one), wait for this many
519: milliseconds before returning
520: .Er EAGAIN
521: error to process.
522: Useful to keep heavily forking runaway processes in bay.
523: Default zero (no sleep).
524: Maximum is 20 seconds.
525: .It Li kern.fscale ( KERN_FSCALE )
526: The kernel fixed-point scale factor.
527: .It Li kern.fsync ( KERN_FSYNC )
1.58 wiz 528: Return 1 if the
529: .St -p1003.1b-93
530: File Synchronization Option is available
1.1 pavel 531: on this system,
1.56 uwe 532: otherwise\ 0.
1.1 pavel 533: .It Li kern.hardclock_ticks ( KERN_HARDCLOCK_TICKS )
534: Returns the number of
535: .Xr hardclock 9
536: ticks.
537: .It Li kern.hostid ( KERN_HOSTID )
1.39 jruoho 538: Get or set the host identifier.
539: This is aimed to replace the legacy
540: .Xr gethostid 3
541: and
542: .Xr sethostid 3
543: system calls.
1.1 pavel 544: .It Li kern.hostname ( KERN_HOSTNAME )
1.39 jruoho 545: Get or set the
546: .Xr hostname 1 .
1.1 pavel 547: .It Li kern.iov_max ( KERN_IOV_MAX )
548: Return the maximum number of
1.56 uwe 549: .Vt iovec
1.1 pavel 550: structures that a process has available for use with
551: .Xr preadv 2 ,
552: .Xr pwritev 2 ,
553: .Xr readv 2 ,
554: .Xr recvmsg 2 ,
555: .Xr sendmsg 2
556: and
557: .Xr writev 2 .
1.39 jruoho 558: .It Li kern.ipc ( KERN_SYSVIPC )
559: Return information about the SysV IPC parameters.
560: The third level names for the ipc variables are detailed below.
561: .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent
562: .It Sy Third level name Type Changeable
563: .It kern.ipc.sysvmsg integer no
564: .It kern.ipc.sysvsem integer no
565: .It kern.ipc.sysvshm integer no
566: .It kern.ipc.sysvipc_info struct no
567: .It kern.ipc.shmmax integer yes
568: .It kern.ipc.shmmni integer yes
569: .It kern.ipc.shmseg integer yes
570: .It kern.ipc.shmmaxpgs integer yes
571: .It kern.ipc.shm_use_phys integer yes
572: .It kern.ipc.msgmni integer yes
573: .It kern.ipc.msgseg integer yes
574: .It kern.ipc.semmni integer yes
575: .It kern.ipc.semmns integer yes
576: .It kern.ipc.semmnu integer yes
577: .El
578: .Bl -tag -width "123456"
579: .It Li kern.ipc.sysvmsg ( KERN_SYSVIPC_MSG )
580: Returns 1 if System V style message queue functionality is available
581: on this system,
1.56 uwe 582: otherwise\ 0.
1.39 jruoho 583: .It Li kern.ipc.sysvsem ( KERN_SYSVIPC_SEM )
584: Returns 1 if System V style semaphore functionality is available
585: on this system,
1.56 uwe 586: otherwise\ 0.
1.39 jruoho 587: .It Li kern.ipc.sysvshm ( KERN_SYSVIPC_SHM )
588: Returns 1 if System V style share memory functionality is available
589: on this system,
1.56 uwe 590: otherwise\ 0.
1.39 jruoho 591: .It Li kern.ipc.sysvipc_info ( KERN_SYSVIPC_INFO )
592: Return System V style IPC configuration and run-time information.
593: The fourth level name selects the System V style IPC facility.
594: .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent
595: .It Sy Fourth level name Type
596: .It KERN_SYSVIPC_MSG_INFO struct msg_sysctl_info
597: .It KERN_SYSVIPC_SEM_INFO struct sem_sysctl_info
598: .It KERN_SYSVIPC_SHM_INFO struct shm_sysctl_info
599: .El
600: .Pp
601: .Bl -tag -width "123456"
602: .It Li KERN_SYSVIPC_MSG_INFO
603: Return information on the System V style message facility.
604: The
605: .Sy msg_sysctl_info
606: structure is defined in
607: .In sys/msg.h .
608: .It Li KERN_SYSVIPC_SEM_INFO
609: Return information on the System V style semaphore facility.
610: The
611: .Sy sem_sysctl_info
612: structure is defined in
613: .In sys/sem.h .
614: .It Li KERN_SYSVIPC_SHM_INFO
615: Return information on the System V style shared memory facility.
616: The
617: .Sy shm_sysctl_info
618: structure is defined in
619: .In sys/shm.h .
620: .El
621: .It Li kern.ipc.shmmax ( KERN_SYSVIPC_SHMMAX )
622: Max shared memory segment size in bytes.
623: .It Li kern.ipc.shmmni ( KERN_SYSVIPC_SHMMNI )
624: Max number of shared memory identifiers.
625: .It Li kern.ipc.shmseg ( KERN_SYSVIPC_SHMSEG )
626: Max shared memory segments per process.
627: .It Li kern.ipc.shmmaxpgs ( KERN_SYSVIPC_SHMMAXPGS )
628: Max amount of shared memory in pages.
629: .It Li kern.ipc.shm_use_phys ( KERN_SYSVIPC_SHMUSEPHYS )
630: Locking of shared memory in physical memory.
631: If 0, memory can be swapped
632: out, otherwise it will be locked in physical memory.
633: .It Li kern.ipc.msgmni
634: Max number of message queue identifiers.
635: .It Li kern.ipc.msgseg
636: Max number of number of message segments.
637: .It Li kern.ipc.semmni
638: Max number of number of semaphore identifiers.
639: .It Li kern.ipc.semmns
640: Max number of number of semaphores in system.
641: .It Li kern.ipc.semmnu
642: Max number of undo structures in system.
643: .El
1.1 pavel 644: .It Li kern.job_control ( KERN_JOB_CONTROL )
1.56 uwe 645: Return 1 if job control is available on this system, otherwise\ 0.
1.1 pavel 646: .It Li kern.labeloffset ( KERN_LABELOFFSET )
1.56 uwe 647: The offset within the sector specified by
648: .Dv KERN_LABELSECTOR
649: of the
1.1 pavel 650: .Xr disklabel 5 .
651: .It Li kern.labelsector ( KERN_LABELSECTOR )
652: The sector number containing the
653: .Xr disklabel 5 .
654: .It Li kern.login_name_max ( KERN_LOGIN_NAME_MAX )
655: The size of the storage required for a login name, in bytes,
656: including the terminating NUL.
657: .It Li kern.logsigexit ( KERN_LOGSIGEXIT )
658: If this flag is non-zero, the kernel will
659: .Xr log 9
660: all process exits due to signals which create a
661: .Xr core 5
662: file, and whether the coredump was created.
663: .It Li kern.mapped_files ( KERN_MAPPED_FILES )
1.58 wiz 664: Returns 1 if the
665: .St -p1003.1b-93
666: Memory Mapped Files Option is available on this system,
1.56 uwe 667: otherwise\ 0.
1.1 pavel 668: .It Li kern.maxfiles ( KERN_MAXFILES )
669: The maximum number of open files that may be open in the system.
670: .It Li kern.maxpartitions ( KERN_MAXPARTITIONS )
671: The maximum number of partitions allowed per disk.
1.71 wiz 672: .It Li kern.maxlwp
1.70 christos 673: The maximum number of Lightweight Processes (threads) the system allows
674: per uid.
1.1 pavel 675: .It Li kern.maxphys ( KERN_MAXPHYS )
676: Maximum raw I/O transfer size.
677: .It Li kern.maxproc ( KERN_MAXPROC )
678: The maximum number of simultaneous processes the system will allow.
679: .It Li kern.maxptys ( KERN_MAXPTYS )
680: The maximum number of pseudo terminals.
681: This value can be both raised and lowered, though it cannot
682: be set lower than number of currently used ptys.
683: See also
684: .Xr pty 4 .
685: .It Li kern.maxvnodes ( KERN_MAXVNODES )
686: The maximum number of vnodes available on the system.
687: This can only be raised.
688: .It Li kern.mbuf ( KERN_MBUF )
689: Return information about the mbuf control variables.
690: Mbufs are data structures which store network packets and other data
691: structures in the networking code, see
692: .Xr mbuf 9 .
693: The third level names for the mbuf variables are detailed below.
694: The changeable column shows whether a process with appropriate
695: privilege may change the value.
1.21 joerg 696: .Bl -column "kern.mbuf.nmbclusters" "integer" "Changeable" -offset indent
1.1 pavel 697: .It Sy Third level name Type Changeable
698: .\" XXX Changeable? really?
699: .It kern.mbuf.mblowat integer yes
700: .It kern.mbuf.mclbytes integer yes
701: .It kern.mbuf.mcllowat integer yes
702: .It kern.mbuf.msize integer yes
703: .It kern.mbuf.nmbclusters integer yes
704: .El
705: .Pp
706: The variables are as follows:
707: .Bl -tag -width "123456"
708: .It Li kern.mbuf.mblowat ( MBUF_MBLOWAT )
709: The mbuf low water mark.
710: .It Li kern.mbuf.mclbytes ( MBUF_MCLBYTES )
711: The mbuf cluster size.
712: .It Li kern.mbuf.mcllowat ( MBUF_MCLLOWAT )
713: The mbuf cluster low water mark.
714: .It Li kern.mbuf.msize ( MBUF_MSIZE )
715: The mbuf base size.
716: .It Li kern.mbuf.nmbclusters ( MBUF_NMBCLUSTERS )
717: The limit on the number of mbuf clusters.
718: The variable can only be increased, and only increased on machines with
719: direct-mapped pool pages.
720: .El
721: .It Li kern.memlock ( KERN_MEMLOCK )
1.58 wiz 722: Returns 1 if the
723: .St -p1003.1b-93
724: Process Memory Locking Option is available on this system,
1.56 uwe 725: otherwise\ 0.
1.1 pavel 726: .It Li kern.memlock_range ( KERN_MEMLOCK_RANGE )
1.58 wiz 727: Returns 1 if the
728: .St -p1003.1b-93
729: Range Memory Locking Option is available on this system,
1.56 uwe 730: otherwise\ 0.
1.1 pavel 731: .It Li kern.memory_protection ( KERN_MEMORY_PROTECTION )
1.58 wiz 732: Returns 1 if the
733: .St -p1003.1b-93
734: Memory Protection Option is available on this system,
1.56 uwe 735: otherwise\ 0.
1.42 jruoho 736: .It Li kern.module
737: Settings related to kernel modules.
738: The third level names for the settings are described below.
739: .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent
740: .It Sy Third level name Type Changeable
741: .It kern.module.autoload integer yes
742: .It kern.module.verbose integer yes
743: .El
744: .Pp
745: The variables are as follows:
746: .Bl -tag -width "123456"
747: .It Li kern.module.autoload
748: A boolean that controls whether kernel modules are loaded automatically.
1.52 jruoho 749: See
1.53 jruoho 750: .Xr module 7
1.42 jruoho 751: for additional details.
752: .It Li kern.module.verbose
753: A boolean that enables or disables verbose
754: debug messages related to kernel modules.
755: .El
1.49 jruoho 756: .It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )
1.58 wiz 757: Returns the standard version the implementation of the
758: .St -p1003.1b-93
1.49 jruoho 759: Monotonic Clock Option conforms to,
1.56 uwe 760: otherwise\ 0.
1.48 jruoho 761: .It Li kern.mqueue
762: Settings related to
763: .Tn POSIX
764: message queues; see
765: .Xr mqueue 3 .
766: This node is created dynamically when
767: the corresponding kernel module is loaded.
768: The third level names for the settings are described below.
769: .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent
770: .It Sy Third level name Type Changeable
771: .It kern.mqueue.mq_open_max integer yes
772: .It kern.mqueue.mq_prio_max integer yes
773: .It kern.mqueue.mq_max_msgsize integer yes
774: .It kern.mqueue.mq_def_maxmsg integer yes
775: .It kern.mqueue.mq_max_maxmsg integer yes
776: .El
777: .Pp
778: The variables are:
779: .Bl -tag -width "123456"
780: .It Li kern.mqueue.mq_open_max
781: The maximum number of message queue descriptors any single process can open.
782: .It Li kern.mqueue.mq_prio_max
783: The maximum priority of a message.
784: .It Li kern.mqueue.mq_max_msgsize
785: The maximum size of a message in a message queue.
786: .It Li kern.mqueue.mq_def_maxmsg
787: The default maximum message count.
788: .It Li kern.mqueue.mq_max_maxmsg
789: The maximum number of messages in a message queue.
790: .El
1.1 pavel 791: .It Li kern.msgbuf ( KERN_MSGBUF )
792: The kernel message buffer, rotated so that the head of the circular kernel
793: message buffer is at the start of the returned data.
794: The returned data may contain NUL bytes.
795: .It Li kern.msgbufsize ( KERN_MSGBUFSIZE )
796: The maximum number of characters that the kernel message buffer can hold.
797: .It Li kern.ngroups ( KERN_NGROUPS )
798: The maximum number of supplemental groups.
1.41 jruoho 799: .\" .It Li kern.no_sa_support
800: .\" XXX: Undocumented.
1.1 pavel 801: .It Li kern.ntptime ( KERN_NTPTIME )
802: A
1.56 uwe 803: .Vt struct ntptimeval
1.1 pavel 804: structure is returned.
805: This structure contains data used by the
806: .Xr ntpd 8
807: program.
808: .It Li kern.osrelease ( KERN_OSRELEASE )
809: The system release string.
810: .It Li kern.osrevision ( KERN_OSREV )
811: The system revision string.
812: .It Li kern.ostype ( KERN_OSTYPE )
813: The system type string.
1.41 jruoho 814: .\".It Li kern.panic_now
815: .\" XXX: Undocumented.
1.1 pavel 816: .It Li kern.pipe ( KERN_PIPE )
817: Pipe settings.
818: The third level names for the integer pipe settings is detailed below.
819: The changeable column shows whether a process with appropriate
820: privilege may change the value.
1.21 joerg 821: .Bl -column "kern.pipe.maxbigpipes" "integer" "Changeable" -offset indent
1.1 pavel 822: .It Sy Third level name Type Changeable
823: .It kern.pipe.kvasiz integer yes
824: .It kern.pipe.maxbigpipes integer yes
825: .It kern.pipe.maxkvasz integer yes
826: .It kern.pipe.limitkva integer yes
827: .It kern.pipe.nbigpipes integer yes
828: .El
829: .Pp
830: The variables are as follows:
831: .Bl -tag -width "123456"
832: .It Li kern.pipe.kvasiz ( KERN_PIPE_KVASIZ )
833: Amount of kernel memory consumed by pipe buffers.
834: .It Li kern.pipe.maxbigpipes ( KERN_PIPE_MAXBIGPIPES )
1.56 uwe 835: Maximum number of
836: .Dq big
837: pipes.
1.1 pavel 838: .It Li kern.pipe.maxkvasz ( KERN_PIPE_MAXKVASZ )
839: Maximum amount of kernel memory to be used for pipes.
840: .It Li kern.pipe.limitkva ( KERN_PIPE_LIMITKVA )
841: Limit for direct transfers via page loan.
842: .It Li kern.pipe.nbigpipes ( KERN_PIPE_NBIGPIPES )
1.56 uwe 843: Number of
844: .Dq big
845: pipes.
1.1 pavel 846: .El
1.39 jruoho 847: .\" XXX: Undocumented .It Li kern.posix ( ? )
848: .\" This is a node in which the only variable is semmax.
1.1 pavel 849: .It Li kern.posix1version ( KERN_POSIX1 )
1.58 wiz 850: The version of ISO/IEC 9945
851: .Pq St -p1003.1
852: with which the system attempts to comply.
1.51 jruoho 853: .It Li kern.posix_aio
854: The version of
855: .St -p1003.1
856: and its Asynchronous I/O option to which the system attempts to conform.
1.1 pavel 857: .It Li kern.posix_barriers ( KERN_POSIX_BARRIERS )
858: The version of
859: .St -p1003.1
860: and its
861: Barriers
862: option to which the system attempts to conform,
1.56 uwe 863: otherwise\ 0.
1.1 pavel 864: .It Li kern.posix_reader_writer_locks ( KERN_POSIX_READER_WRITER_LOCKS )
865: The version of
866: .St -p1003.1
867: and its
868: Read-Write Locks
869: option to which the system attempts to conform,
1.56 uwe 870: otherwise\ 0.
1.41 jruoho 871: .\".It Li kern.posix_sched
872: .\" XXX: Undocumented.
1.1 pavel 873: .It Li kern.posix_semaphores ( KERN_POSIX_SEMAPHORES )
874: The version of
875: .St -p1003.1
876: and its
877: Semaphores
878: option to which the system attempts to conform,
1.56 uwe 879: otherwise\ 0.
1.1 pavel 880: .It Li kern.posix_spin_locks ( KERN_POSIX_SPIN_LOCKS )
881: The version of
882: .St -p1003.1
883: and its
884: Spin Locks
885: option to which the system attempts to conform,
1.56 uwe 886: otherwise\ 0.
1.1 pavel 887: .It Li kern.posix_threads ( KERN_POSIX_THREADS )
888: The version of
889: .St -p1003.1
890: and its
891: Threads
892: option to which the system attempts to conform,
1.56 uwe 893: otherwise\ 0.
1.1 pavel 894: .It Li kern.posix_timers ( KERN_POSIX_TIMERS )
895: The version of
896: .St -p1003.1
897: and its
898: Timers
899: option to which the system attempts to conform,
1.56 uwe 900: otherwise\ 0.
1.1 pavel 901: .It Li kern.proc ( KERN_PROC )
902: Return the entire process table, or a subset of it.
903: An array of
1.56 uwe 904: .Vt struct kinfo_proc
1.1 pavel 905: structures is returned,
906: whose size depends on the current number of such objects in the system.
907: The third and fourth level numeric names are as follows:
1.21 joerg 908: .Bl -column "KERN_PROC_SESSION" "Fourth level is:" -offset indent
1.1 pavel 909: .It Sy Third level name Fourth level is:
1.21 joerg 910: .It KERN_PROC_ALL None
911: .It KERN_PROC_GID A group ID
912: .It KERN_PROC_PID A process ID
913: .It KERN_PROC_PGRP A process group
914: .It KERN_PROC_RGID A real group ID
915: .It KERN_PROC_RUID A real user ID
916: .It KERN_PROC_SESSION A session ID
917: .It KERN_PROC_TTY A tty device
918: .It KERN_PROC_UID A user ID
1.1 pavel 919: .El
920: .It Li kern.proc2 ( KERN_PROC2 )
1.56 uwe 921: As for
922: .Dv KERN_PROC ,
923: but an array of
924: .Vt struct kinfo_proc2
1.1 pavel 925: structures are returned.
926: The fifth level name is the size of the
1.56 uwe 927: .Vt struct kinfo_proc2
1.1 pavel 928: and the sixth level name is the number of structures to return.
929: .It Li kern.proc_args ( KERN_PROC_ARGS )
930: Return the argv or environment strings (or the number thereof)
931: of a process.
932: Multiple strings are returned separated by NUL characters.
933: The third level name is the process ID.
934: The fourth level name is as follows:
1.21 joerg 935: .Bl -column "KERN_PROG_NARGV" "The number of environ strings" -offset indent
936: .It KERN_PROC_ARGV The argv strings
937: .It KERN_PROC_ENV The environ strings
938: .It KERN_PROC_NARGV The number of argv strings
939: .It KERN_PROC_NENV The number of environ strings
1.1 pavel 940: .El
941: .It Li kern.profiling ( KERN_PROF )
942: Return profiling information about the kernel.
943: If the kernel is not compiled for profiling,
1.56 uwe 944: attempts to retrieve any of the
945: .Dv KERN_PROF
946: values will fail with
1.1 pavel 947: .Er EOPNOTSUPP .
948: The third level names for the string and integer profiling information
949: is detailed below.
950: The changeable column shows whether a process with appropriate
951: privilege may change the value.
1.21 joerg 952: .Bl -column "kern.profiling.gmonparam" "struct gmonparam" "Changeable" -offset indent
1.1 pavel 953: .It Sy Third level name Type Changeable
954: .It kern.profiling.count u_short[\|] yes
955: .It kern.profiling.froms u_short[\|] yes
956: .It kern.profiling.gmonparam struct gmonparam no
957: .It kern.profiling.state integer yes
958: .It kern.profiling.tos struct tostruct yes
959: .El
960: .Pp
961: The variables are as follows:
962: .Bl -tag -width "123456"
963: .It Li kern.profiling.count ( GPROF_COUNT )
964: Array of statistical program counter counts.
965: .It Li kern.profiling.froms ( GPROF_FROMS )
966: Array indexed by program counter of call-from points.
967: .It Li kern.profiling.gmonparams ( GPROF_GMONPARAM )
968: Structure giving the sizes of the above arrays.
969: .It Li kern.profiling.state ( GPROF_STATE )
970: Profiling state.
1.56 uwe 971: If set to
972: .Dv GMON_PROF_ON ,
973: starts profiling.
974: If set to
975: .Dv GMON_PROF_OFF ,
976: stops profiling.
1.1 pavel 977: .It Li kern.profiling.tos ( GPROF_TOS )
978: Array of
1.56 uwe 979: .Vt struct tostruct
1.1 pavel 980: describing destination of calls and their counts.
981: .El
1.41 jruoho 982: .\" .It Li kern.pset
983: .\" XXX: Undocumented.
1.1 pavel 984: .It Li kern.rawpartition ( KERN_RAWPARTITION )
985: The raw partition of a disk (a == 0).
986: .It Li kern.root_device ( KERN_ROOT_DEVICE )
987: The name of the root device (e.g.,
988: .Dq wd0 ) .
989: .It Li kern.root_partition ( KERN_ROOT_PARTITION )
990: The root partition on the root device (a == 0).
991: .It Li kern.rtc_offset ( KERN_RTC_OFFSET )
992: Return the offset of real time clock from UTC in minutes.
993: .It Li kern.saved_ids ( KERN_SAVED_IDS )
994: Returns 1 if saved set-group and saved set-user ID is available.
995: .It Li kern.sbmax ( KERN_SBMAX )
996: Maximum socket buffer size.
997: .\" XXX units?
998: .It Li kern.securelevel ( KERN_SECURELVL )
1.25 elad 999: See
1000: .Xr secmodel_securelevel 9 .
1.41 jruoho 1001: .\" .It Li kern.sched
1002: .\" XXX: Undocumented.
1.1 pavel 1003: .It Li kern.somaxkva ( KERN_SOMAXKVA )
1004: Maximum amount of kernel memory to be used for socket buffers.
1005: .\" XXX units?
1006: .It Li kern.synchronized_io ( KERN_SYNCHRONIZED_IO )
1.58 wiz 1007: Returns 1 if the
1008: .St -p1003.1b-93
1009: Synchronized I/O Option is available on this system,
1.56 uwe 1010: otherwise\ 0.
1.19 christos 1011: .It Li kern.timecounter ( dynamic )
1012: Display and control the timecounter source of the system.
1.21 joerg 1013: .Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent
1.19 christos 1014: .It Sy Third level name Type Changeable
1015: .It kern.timecounter.choice string no
1016: .It kern.timecounter.hardware string yes
1017: .It kern.timecounter.timestepwarnings integer yes
1018: .El
1019: .Pp
1020: The variables are as follows:
1021: .Bl -tag -width "123456"
1022: .It Li kern.timecounter.choice ( dynamic )
1023: The list of available timecounters with their quality and frequency.
1024: .It Li kern.timecounter.hardware ( dynamic )
1025: The currently selected timecounter source.
1026: .It Li kern.timecounter.timestepwarnings ( dynamic )
1027: If non-zero display a message each time the time is stepped.
1028: .El
1.1 pavel 1029: .It Li kern.timex ( KERN_TIMEX )
1030: Not available.
1031: .It Li kern.tkstat ( KERN_TKSTAT )
1032: Return information about the number of characters sent and received
1033: on ttys.
1034: The third level names for the tty statistic variables are detailed below.
1035: The changeable column shows whether a process
1036: with appropriate privilege may change the value.
1.21 joerg 1037: .Bl -column "kern.tkstat.cancc" "quad" "Changeable" -offset indent
1.1 pavel 1038: .It Sy Third level name Type Changeable
1039: .It kern.tkstat.cancc quad no
1040: .It kern.tkstat.nin quad no
1041: .It kern.tkstat.nout quad no
1042: .It kern.tkstat.rawcc quad no
1043: .El
1044: .Pp
1045: The variables are as follows:
1046: .Bl -tag -width "123456"
1047: .It Li kern.tkstat.cancc ( KERN_TKSTAT_CANCC )
1048: The number of canonical input characters.
1049: .It Li kern.tkstat.nin ( KERN_TKSTAT_NIN )
1050: The total number of input characters.
1051: .It Li kern.tkstat.nout ( KERN_TKSTAT_NOUT )
1052: The total number of output characters.
1053: .It Li kern.tkstat.rawcc ( KERN_TKSTAT_RAWCC )
1054: The number of raw input characters.
1055: .El
1.66 christos 1056: .It Li kern.tty
1057: The third level names for the tty setup variables are detailed below.
1058: The changeable column shows whether a process
1059: with appropriate privilege may change the value.
1060: .Bl -column "kern.tty.qsize" "int" "Changeable" -offset indent
1061: .It Sy Third level name Type Changeable
1062: .It kern.tty.qsize int yes
1063: .El
1064: .Pp
1065: The variables are as follows:
1066: .Bl -tag -width "123456"
1067: .It Li kern.tty.qsize
1068: Control/display the size of the default input and output queues selected
1069: during tty creation.
1070: Is converted to a power of two and its range is between
1071: .Dv 1024
1072: and
1073: .Dv 65536 .
1074: .El
1.70 christos 1075: .It Li kern.uidinfo
1076: Resource usage for the current user.
1077: .Bl -column "kern.uidinfo.proccnt" "integer" "Changeable" -offset indent
1078: .It Sy Third level name Type Changeable
1079: .It kern.uidinfo.proccnt integer no
1080: .It kern.uidinfo.lwpcnt integer no
1081: .It kern.uidinfo.lockcnt integer no
1082: .It kern.uidinfo.sbsize integer no
1083: .El
1084: .Bl -tag -width "123456"
1085: .It Li kern.uidinfo.proccnt
1086: Returns the number of active processes for the current user.
1087: .It Li kern.uidinfo.lwpcnt
1088: Returns the number of active threads for the current user; the first thread
1089: of each process is not counted.
1090: .It Li kern.uidinfo.lockcnt
1091: Number of locks held by the current user.
1092: .It Li kern.uidinfo.sbsize
1093: Number of bytes in socket buffers allocated to the current user.
1094: .El
1.1 pavel 1095: .It Li kern.urandom ( KERN_URND )
1096: Random integer value.
1.45 jruoho 1097: .It Li kern.usercrypto
1098: When enabled, allows userland to
1099: .Xr open 2
1100: the
1101: .Pa /dev/crypto
1102: special device, used by the
1103: .Xr crypto 4
1104: system.
1105: .It Li kern.userasymcrypto
1106: Enables or disables the use of software asymmetric crypto support in the
1107: .Xr crypto 4
1108: system.
1.1 pavel 1109: .It Li kern.veriexec
1.40 jruoho 1110: Runtime information for
1111: .Xr veriexec 8 .
1112: .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent
1113: .It Sy Third level name Type Changeable
1114: .It kern.veriexec.algorithms string no
1115: .It kern.veriexec.count node not applicable
1116: .It kern.veriexec.strict integer yes
1117: .It kern.veriexec.verbose integer yes
1118: .El
1.1 pavel 1119: .Bl -tag -width "123456"
1120: .It Li kern.veriexec.algorithms
1121: Returns a string with the supported algorithms in Veriexec.
1122: .It Li kern.veriexec.count
1123: Sub-nodes are added to this node as new mounts are monitored by Veriexec.
1124: Each mount will be under its own
1125: .No tableN
1126: node.
1127: Under each node there will be three variables, indicating the mount
1.57 wiz 1128: point, the file system type, and the number of entries.
1.1 pavel 1129: .It Li kern.veriexec.strict
1130: Controls the strict level of Veriexec.
1131: See
1.62 jruoho 1132: .Xr security 7
1.1 pavel 1133: for more information on each level's implications.
1134: .It Li kern.veriexec.verbose
1135: Controls the verbosity level of Veriexec.
1136: If 0, only the minimal
1137: indication required will be given about what's happening - fingerprint
1138: mismatches, removal of entries from the tables, modification of a
1139: fingerprinted file.
1140: If 1, more messages will be printed (ie., when a file with a valid
1141: fingerprint is accessed).
1142: Verbose level 2 is debug mode.
1143: .El
1144: .It Li kern.version ( KERN_VERSION )
1145: The system version string.
1146: .It Li kern.vnode ( KERN_VNODE )
1147: Return the entire vnode table.
1148: Note, the vnode table is not necessarily a consistent snapshot of
1149: the system.
1150: The returned data consists of an array whose size depends on the
1151: current number of such objects in the system.
1152: Each element of the array contains the kernel address of a vnode
1.56 uwe 1153: .Vt struct vnode *
1.1 pavel 1154: followed by the vnode itself
1.56 uwe 1155: .Vt struct vnode .
1.43 jruoho 1156: .\" XXX: Undocumented: kern.lwp: no children?
1.1 pavel 1157: .El
1.50 jruoho 1158: .Ss The machdep.* subtree
1.1 pavel 1159: The set of variables defined is architecture dependent.
1160: Most architectures define at least the following variables.
1.43 jruoho 1161: .Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent
1.1 pavel 1162: .It Sy Second level name Type Changeable
1.43 jruoho 1163: .It Li machdep.booted_kernel string no
1.1 pavel 1164: .El
1.43 jruoho 1165: .\" XXX: Document the above.
1.50 jruoho 1166: .Ss The net.* subtree
1.1 pavel 1167: The string and integer information available for the
1168: .Li net
1169: level is detailed below.
1170: The changeable column shows whether a process with appropriate
1171: privilege may change the value.
1172: The second and third levels are typically the protocol family and
1173: protocol number, though this is not always the case.
1.21 joerg 1174: .Bl -column "Second level name" "IPsec key management values" "Changeable" -offset indent
1.1 pavel 1175: .It Sy Second level name Type Changeable
1176: .It net.route routing messages no
1177: .It net.inet IPv4 values yes
1178: .It net.inet6 IPv6 values yes
1179: .It net.key IPsec key management values yes
1180: .El
1181: .Pp
1182: .Bl -tag -width "123456"
1183: .It Li net.route ( PF_ROUTE )
1184: .\" XXX really?
1185: Return the entire routing table or a subset of it.
1186: The data is returned as a sequence of routing messages (see
1187: .Xr route 4
1188: for the header file, format and meaning).
1189: The length of each message is contained in the message header.
1190: .Pp
1.56 uwe 1191: The third level name is a protocol number, which is currently always\ 0.
1.1 pavel 1192: The fourth level name is an address family, which may be set to 0 to
1193: select all address families.
1194: The fifth and sixth level names are as follows:
1.21 joerg 1195: .Bl -column "Fifth level name" "Sixth level is:" -offset indent
1.1 pavel 1196: .It Sy Fifth level name Sixth level is:
1.21 joerg 1197: .It NET_RT_FLAGS rtflags
1198: .It NET_RT_DUMP None
1199: .It NET_RT_IFLIST None
1.1 pavel 1200: .El
1201: .It Li net.inet ( PF_INET )
1202: Get or set various global information about the IPv4
1203: .Pq Internet Protocol version 4 .
1204: The third level name is the protocol.
1205: The fourth level name is the variable name.
1206: The currently defined protocols and names are:
1.21 joerg 1207: .Bl -column "Protocol name" "sack.globalmaxholes" "integer" "Changeable" -offset 4n
1.1 pavel 1208: .It Sy Protocol name Variable name Type Changeable
1209: .It arp down integer yes
1210: .It arp keep integer yes
1.65 christos 1211: .It arp log_movements integer yes
1212: .It arp log_permanent_modify integer yes
1213: .It arp log_wrong_iface integer yes
1.1 pavel 1214: .It arp prune integer yes
1215: .It arp refresh integer yes
1216: .It carp allow integer yes
1217: .It carp preempt integer yes
1218: .It carp log integer yes
1219: .It carp arpbalance integer yes
1220: .It icmp errppslimit integer yes
1221: .It icmp maskrepl integer yes
1222: .It icmp rediraccept integer yes
1223: .It icmp redirtimeout integer yes
1.28 christos 1224: .It icmp bmcastecho integer yes
1.1 pavel 1225: .It ip allowsrcrt integer yes
1.72 christos 1226: .It ip anonportalgo.selected string yes
1227: .It ip anonportalgo.available string yes
1.1 pavel 1228: .It ip anonportmax integer yes
1229: .It ip anonportmin integer yes
1230: .It ip checkinterface integer yes
1231: .It ip directed-broadcast integer yes
1232: .It ip do_loopback_cksum integer yes
1233: .It ip forwarding integer yes
1234: .It ip forwsrcrt integer yes
1235: .It ip gifttl integer yes
1236: .It ip grettl integer yes
1.8 liamjfoy 1237: .It ip hashsize integer yes
1.1 pavel 1238: .It ip hostzerobroadcast integer yes
1239: .It ip lowportmin integer yes
1240: .It ip lowportmax integer yes
1241: .It ip maxflows integer yes
1242: .It ip maxfragpackets integer yes
1243: .It ip mtudisc integer yes
1244: .It ip mtudisctimeout integer yes
1245: .It ip random_id integer yes
1246: .It ip redirect integer yes
1247: .It ip subnetsarelocal integer yes
1248: .It ip ttl integer yes
1249: .It tcp rfc1323 integer yes
1250: .It tcp sendspace integer yes
1251: .It tcp recvspace integer yes
1252: .It tcp mssdflt integer yes
1253: .It tcp syn_cache_limit integer yes
1254: .It tcp syn_bucket_limit integer yes
1255: .It tcp syn_cache_interval integer yes
1256: .It tcp init_win integer yes
1257: .It tcp init_win_local integer yes
1258: .It tcp mss_ifmtu integer yes
1259: .It tcp win_scale integer yes
1260: .It tcp timestamps integer yes
1261: .It tcp compat_42 integer yes
1262: .It tcp cwm integer yes
1263: .It tcp cwm_burstsize integer yes
1264: .It tcp ack_on_push integer yes
1265: .It tcp keepidle integer yes
1266: .It tcp keepintvl integer yes
1267: .It tcp keepcnt integer yes
1268: .It tcp slowhz integer no
1.12 christos 1269: .It tcp keepinit integer yes
1.1 pavel 1270: .It tcp log_refused integer yes
1271: .It tcp rstppslimit integer yes
1272: .It tcp ident struct no
1.13 christos 1273: .It tcp drop struct no
1.1 pavel 1274: .It tcp sack.enable integer yes
1275: .It tcp sack.globalholes integer no
1276: .It tcp sack.globalmaxholes integer yes
1277: .It tcp sack.maxholes integer yes
1278: .It tcp ecn.enable integer yes
1279: .It tcp ecn.maxretries integer yes
1280: .It tcp congctl.selected string yes
1281: .It tcp congctl.available string yes
1282: .It tcp abc.enable integer yes
1283: .It tcp abc.aggressive integer yes
1284: .It udp checksum integer yes
1285: .It udp do_loopback_cksum integer yes
1286: .It udp recvspace integer yes
1287: .It udp sendspace integer yes
1288: .El
1289: .Pp
1290: The variables are as follows:
1291: .Bl -tag -width "123456"
1292: .It Li arp.down
1293: Failed ARP entry lifetime.
1294: .It Li arp.keep
1295: Valid ARP entry lifetime.
1296: .It Li arp.prune
1297: ARP cache pruning interval.
1298: .It Li arp.refresh
1299: ARP entry refresh interval.
1300: .It Li carp.allow
1301: If set to 0, incoming
1302: .Xr carp 4
1303: packets will not be processed.
1304: If set to any other value, processing will occur.
1305: Enabled by default.
1306: .It Li carp.arpbalance
1307: If set to any value other than 0, the ARP balancing functionality of
1308: .Xr carp 4
1309: is enabled.
1310: When ARP requests are received for an IP address which is part of any virtual
1311: host, carp will hash the source IP in the ARP request to select one of the
1312: virtual hosts from the set of all the virtual hosts which have that IP address.
1313: The master of that host will respond with the correct virtual MAC address.
1314: Disabled by default.
1315: .It Li carp.log
1316: If set to any value other than 0,
1317: .Xr carp 4
1318: will log errors.
1319: Disabled by default.
1320: .It Li carp.preempt
1321: If set to 0,
1322: .Xr carp 4
1323: will not attempt to become master if it is receiving advertisements from
1324: another active master.
1325: If set to any other value, carp will become master of the virtual host if it
1326: believes it can send advertisements more frequently than the current master.
1327: Disabled by default.
1328: .It Li ip.allowsrcrt
1329: If set to 1, the host accepts source routed packets.
1.72 christos 1330: .It Li ip.anonportalgo.available
1331: The available RFC 6056 port randomization algorithms.
1332: .It Li ip.anonportalgo.selected
1333: The currently selected RFC 6056 port randomization algorithm.
1.1 pavel 1334: .It Li ip.anonportmax
1335: The highest port number to use for TCP and UDP ephemeral port allocation.
1336: This cannot be set to less than 1024 or greater than 65535, and must
1337: be greater than
1338: .Li ip.anonportmin .
1339: .It Li ip.anonportmin
1340: The lowest port number to use for TCP and UDP ephemeral port allocation.
1341: This cannot be set to less than 1024 or greater than 65535.
1342: .It Li ip.checkinterface
1343: If set to non-zero, the host will reject packets addressed to it
1344: that arrive on an interface not bound to that address.
1345: Currently, this must be disabled if ipnat is used to translate the
1346: destination address to another local interface, or if addresses
1347: are added to the loopback interface instead of the interface where
1348: the packets for those packets are received.
1349: .It Li ip.directed-broadcast
1350: If set to 1, enables directed broadcast behavior for the host.
1351: .It Li ip.do_loopback_cksum
1352: Perform IP checksum on loopback.
1353: .It Li ip.forwarding
1354: If set to 1, enables IP forwarding for the host,
1355: meaning that the host is acting as a router.
1356: .It Li ip.forwsrcrt
1357: If set to 1, enables forwarding of source-routed packets for the host.
1358: This value may only be changed if the kernel security level is less than 1.
1359: .It Li ip.gifttl
1360: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1361: .Xr gif 4
1362: tunnel interface.
1363: .It Li ip.grettl
1364: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1365: .Xr gre 4
1366: tunnel interface.
1.8 liamjfoy 1367: .It Li ip.hashsize
1368: The size of IPv4 Fast Forward hash table.
1369: This value must be a power of 2 (64, 256...).
1370: A larger hash table size results in fewer collisions.
1371: Also see
1372: .Li ip.maxflows .
1.1 pavel 1373: .It Li ip.hostzerobroadcast
1374: All zeroes address is broadcast address.
1375: .It Li ip.lowportmax
1376: The highest port number to use for TCP and UDP reserved port allocation.
1377: This cannot be set to less than 0 or greater than 1024, and must
1378: be greater than
1379: .Li ip.lowportmin .
1380: .It Li ip.lowportmin
1381: The lowest port number to use for TCP and UDP reserved port allocation.
1382: This cannot be set to less than 0 or greater than 1024, and must
1383: be smaller than
1384: .Li ip.lowportmax .
1385: .It Li ip.maxflows
1.5 liamjfoy 1386: IPv4 Fast Forwarding is enabled by default.
1387: If set to 0, IPv4 Fast Forwarding is disabled.
1.1 pavel 1388: .Li ip.maxflows
1389: controls the maximum amount of flows which can be created.
1390: The default value is 256.
1391: .It Li ip.maxfragpackets
1392: The maximum number of fragmented packets the node will accept.
1393: 0 means that the node will not accept any fragmented packets.
1394: \-1 means that the node will accept as many fragmented packets as it receives.
1395: The flag is provided basically for avoiding possible DoS attacks.
1396: .It Li ip.mtudisc
1397: If set to 1, enables Path MTU Discovery (RFC 1191).
1398: When Path MTU Discovery is enabled, the transmitted TCP segment
1399: size will be determined by the advertised maximum segment size
1400: (MSS) from the remote end, as constrained by the path MTU.
1401: If MTU Discovery is disabled, the transmitted segment size will
1402: never be greater than
1403: .Li tcp.mssdflt
1404: (the local maximum segment size).
1405: .It Li ip.mtudisctimeout
1406: The number of seconds in which a route added by the Path MTU
1407: Discovery engine will time out.
1408: When the route times out, the Path
1409: MTU Discovery engine will attempt to probe a larger path MTU.
1410: .It Li ip.random_id
1411: Assign random ip_id values.
1412: .It Li ip.redirect
1413: If set to 1, ICMP redirects may be sent by the host.
1414: This option is ignored unless the host is routing IP packets,
1415: and should normally be enabled on all systems.
1416: .It Li ip.subnetsarelocal
1417: If set to 1, subnets are to be considered local addresses.
1418: .It Li ip.ttl
1419: The maximum time-to-live (hop count) value for an IP packet sourced by
1420: the system.
1421: This value applies to normal transport protocols, not to ICMP.
1422: .It Li icmp.errppslimit
1423: The variable specifies the maximum number of outgoing ICMP error messages,
1424: per second.
1425: ICMP error messages that exceeded the value are subject to rate limitation
1426: and will not go out from the node.
1427: Negative value disables rate limitation.
1428: .It Li icmp.maskrepl
1429: If set to 1, ICMP network mask requests are to be answered.
1430: .It Li icmp.rediraccept
1431: If set to non-zero, the host will accept ICMP redirect packets.
1432: Note that routers will never accept ICMP redirect packets,
1433: and the variable is meaningful on IP hosts only.
1434: .It Li icmp.redirtimeout
1435: The variable specifies lifetime of routing entries generated by incoming
1436: ICMP redirect.
1437: This defaults to 600 seconds.
1438: .It Li icmp.returndatabytes
1439: Number of bytes to return in an ICMP error message.
1.28 christos 1440: .It Li icmp.bmcastecho
1441: If set to 1, enables responding to ICMP echo or timestamp request to the
1442: broadcast address.
1.1 pavel 1443: .It Li tcp.ack_on_push
1444: If set to 1, TCP is to immediately transmit an ACK upon reception of
1445: a packet with PUSH set.
1446: This can avoid losing a round trip time in some rare situations,
1447: but has the caveat of potentially defeating TCP's delayed ACK algorithm.
1448: Use of this option is generally not recommended, but
1449: the variable exists in case your configuration really needs it.
1450: .It Li tcp.compat_42
1451: If set to 1, enables work-arounds for bugs in the 4.2BSD TCP implementation.
1452: Use of this option is not recommended, although it may be
1453: required in order to communicate with extremely old TCP implementations.
1454: .It Li tcp.cwm
1455: If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window
1456: Monitoring algorithm.
1457: This algorithm prevents line-rate bursts of packets that could
1458: otherwise occur when data begins flowing on an idle TCP connection.
1459: These line-rate bursts can contribute to network and router congestion.
1460: This can be particularly useful on World Wide Web servers
1461: which support HTTP/1.1, which has lingering connections.
1462: .It Li tcp.cwm_burstsize
1463: The Congestion Window Monitoring allowed burst size, in terms
1464: of packet count.
1465: .It Li tcp.delack_ticks
1466: Number of ticks to delay sending an ACK.
1467: .It Li tcp.do_loopback_cksum
1468: Perform TCP checksum on loopback.
1469: .It Li tcp.init_win
1470: A value indicating the TCP initial congestion window.
1471: If this value is 0, an auto-tuning algorithm designed to use an initial
1472: window of approximately 4K bytes is in use.
1473: Otherwise, this value indicates a fixed number of packets.
1474: .It Li tcp.init_win_local
1475: Like
1476: .Li tcp.init_win ,
1477: but used when communicating with hosts on a local network.
1478: .It Li tcp.keepcnt
1479: Number of keepalive probes sent before declaring a connection dead.
1480: If set to zero, there is no limit;
1481: keepalives will be sent until some kind of
1482: response is received from the peer.
1483: .It Li tcp.keepidle
1484: Time a connection must be idle before keepalives are sent (if keepalives
1485: are enabled for the connection).
1486: See also tcp.slowhz.
1487: .It Li tcp.keepintvl
1488: Time after a keepalive probe is sent until, in the absence of any response,
1489: another probe is sent.
1490: See also tcp.slowhz.
1491: .It Li tcp.log_refused
1492: If set to 1, refused TCP connections to the host will be logged.
1.12 christos 1493: .It Li tcp.keepinit
1494: Timeout in seconds during connection establishment.
1.1 pavel 1495: .It Li tcp.mss_ifmtu
1496: If set to 1, TCP calculates the outgoing maximum segment size based on
1497: the MTU of the appropriate interface.
1498: If set to 0, it is calculated based on the greater of the MTU of the
1499: interface, and the largest (non-loopback) interface MTU on the system.
1500: .It Li tcp.mssdflt
1501: The default maximum segment size both advertised to the peer
1502: and to use when either the peer does not advertise a maximum segment size to
1503: us during connection setup or Path MTU Discovery
1504: .Li ( ip.mtudisc )
1505: is disabled.
1506: Do not change this value unless you really know what you are doing.
1507: .It Li tcp.recvspace
1508: The default TCP receive buffer size.
1509: .It Li tcp.rfc1323
1510: If set to 1, enables RFC 1323 extensions to TCP.
1511: .It Li tcp.rstppslimit
1512: The variable specifies the maximum number of outgoing TCP RST packets,
1513: per second.
1514: TCP RST packet that exceeded the value are subject to rate limitation
1515: and will not go out from the node.
1516: Negative value disables rate limitation.
1.13 christos 1517: .It Li tcp.ident
1518: Return the user ID of a connected socket pair.
1519: (RFC1413 Identification Protocol lookups.)
1520: .It Li tcp.drop
1521: Drop a TCP socket pair connection.
1.1 pavel 1522: .It Li tcp.sack.enable
1523: If set to 1, enables RFC 2018 Selective ACKnowledgement.
1524: .It Li tcp.sack.globalholes
1525: Global number of TCP SACK holes.
1526: .It Li tcp.sack.globalmaxholes
1527: Global maximum number of TCP SACK holes.
1528: .It Li tcp.sack.maxholes
1529: Maximum number of TCP SACK holes allowed per connection.
1530: .It Li tcp.ecn.enable
1531: If set to 1, enables RFC 3168 Explicit Congestion Notification.
1532: .It Li tcp.ecn.maxretries
1533: Number of times to retry sending the ECN-setup packet.
1534: .It Li tcp.sendspace
1535: The default TCP send buffer size.
1536: .It Li tcp.slowhz
1537: The units for tcp.keepidle and tcp.keepintvl; those variables are in ticks
1538: of a clock that ticks tcp.slowhz times per second.
1539: (That is, their values
1540: must be divided by the tcp.slowhz value to get times in seconds.)
1541: .It Li tcp.syn_bucket_limit
1542: The maximum number of entries allowed per hash bucket in the TCP
1543: compressed state engine.
1544: .It Li tcp.syn_cache_limit
1545: The maximum number of entries allowed in the TCP compressed state
1546: engine.
1547: .It Li tcp.timestamps
1548: If rfc1323 is enabled, a value of 1 indicates RFC 1323 time stamp options,
1549: used for measuring TCP round trip times, are enabled.
1550: .It Li tcp.win_scale
1551: If rfc1323 is enabled, a value of 1 indicates RFC 1323 window scale options,
1552: for increasing the TCP window size, are enabled.
1553: .It Li tcp.congctl.available
1554: The available TCP congestion control algorithms.
1555: .It Li tcp.congctl.selected
1556: The currently selected TCP congestion control algorithm.
1557: .It Li tcp.abc.enable
1558: If set to 1, use RFC 3465 Appropriate Byte Counting (ABC).
1559: If set to 0, use traditional Packet Counting.
1560: .It Li tcp.abc.aggressive
1561: Choose the L parameter found in RFC 3465.
1562: L is the maximum cwnd increase for an ack during slow start.
1563: If set to 1, use L=2*SMSS.
1564: If set to 0, use L=1*SMSS.
1565: It has no effect unless tcp.abc.enable is set to 1.
1566: .It Li udp.checksum
1567: If set to 1, UDP checksums are being computed.
1568: Received non-zero UDP checksums are always checked.
1569: Disabling UDP checksums is strongly discouraged.
1.67 christos 1570: .It Li udp.recvspace
1571: The default UDP receive buffer size.
1.1 pavel 1572: .It Li udp.sendspace
1573: The default UDP send buffer size.
1574: .El
1575: .Pp
1576: For variables net.*.ipsec, please refer to
1577: .Xr ipsec 4 .
1578: .It Li net.inet6 ( PF_INET6 )
1579: Get or set various global information about the IPv6
1580: .Pq Internet Protocol version 6 .
1581: The third level name is the protocol.
1582: The fourth level name is the variable name.
1583: The currently defined protocols and names are:
1.21 joerg 1584: .Bl -column "Protocol name" "do_loopback_cksum" "integer" "Changeable" -offset indent
1.1 pavel 1585: .It Sy Protocol name Variable name Type Changeable
1586: .It icmp6 errppslimit integer yes
1587: .It icmp6 mtudisc_hiwat integer yes
1588: .It icmp6 mtudisc_lowat integer yes
1589: .It icmp6 nd6_debug integer yes
1590: .It icmp6 nd6_delay integer yes
1591: .It icmp6 nd6_maxnudhint integer yes
1592: .It icmp6 nd6_mmaxtries integer yes
1593: .It icmp6 nd6_prune integer yes
1594: .It icmp6 nd6_umaxtries integer yes
1595: .It icmp6 nd6_useloopback integer yes
1596: .It icmp6 nodeinfo integer yes
1597: .It icmp6 rediraccept integer yes
1598: .It icmp6 redirtimeout integer yes
1599: .It ip6 accept_rtadv integer yes
1.72 christos 1600: .It ip6 anonportalgo.selected string yes
1601: .It ip6 anonportalgo.available string yes
1.1 pavel 1602: .It ip6 anonportmax integer yes
1603: .It ip6 anonportmin integer yes
1604: .It ip6 auto_flowlabel integer yes
1605: .It ip6 dad_count integer yes
1606: .It ip6 defmcasthlim integer yes
1607: .It ip6 forwarding integer yes
1608: .It ip6 gifhlim integer yes
1.7 liamjfoy 1609: .It ip6 hashsize integer yes
1.1 pavel 1610: .It ip6 hlim integer yes
1611: .It ip6 hdrnestlimit integer yes
1612: .It ip6 kame_version string no
1613: .It ip6 keepfaith integer yes
1614: .It ip6 log_interval integer yes
1615: .It ip6 lowportmax integer yes
1616: .It ip6 lowportmin integer yes
1.73 ! christos 1617: .It ip6 maxdynroutes integer yes
! 1618: .It ip6 maxifprefixes integer yes
! 1619: .It ip6 maxifdefrouters integer yes
1.5 liamjfoy 1620: .It ip6 maxflows integer yes
1.1 pavel 1621: .It ip6 maxfragpackets integer yes
1622: .It ip6 maxfrags integer yes
1.73 ! christos 1623: .It ip6 neighborgcthresh integer yes
1.1 pavel 1624: .It ip6 redirect integer yes
1625: .It ip6 rr_prune integer yes
1626: .It ip6 use_deprecated integer yes
1627: .It ip6 v6only integer yes
1628: .It udp6 do_loopback_cksum integer yes
1629: .It udp6 recvspace integer yes
1630: .It udp6 sendspace integer yes
1631: .El
1632: .Pp
1633: The variables are as follows:
1634: .Bl -tag -width "123456"
1635: .It Li ip6.accept_rtadv
1636: If set to non-zero, the node will accept ICMPv6 router advertisement packets
1637: and autoconfigures address prefixes and default routers.
1638: The node must be a host
1639: .Pq not a router
1640: for the option to be meaningful.
1.72 christos 1641: .It Li ip6.anonportalgo.available
1642: The available RFC 6056 port randomization algorithms.
1643: .It Li ip6.anonportalgo.selected
1644: The currently selected RFC 6056 port randomization algorithm.
1.1 pavel 1645: .It Li ip6.anonportmax
1646: The highest port number to use for TCP and UDP ephemeral port allocation.
1647: This cannot be set to less than 1024 or greater than 65535, and must
1648: be greater than
1649: .Li ip6.anonportmin .
1650: .It Li ip6.anonportmin
1651: The lowest port number to use for TCP and UDP ephemeral port allocation.
1652: This cannot be set to less than 1024 or greater than 65535.
1653: .It Li ip6.auto_flowlabel
1654: On connected transport protocol packets,
1655: fill IPv6 flowlabel field to help intermediate routers to identify packet flows.
1656: .It Li ip6.dad_count
1657: The variable configures number of IPv6 DAD
1658: .Pq duplicated address detection
1659: probe packets.
1660: The packets will be generated when IPv6 interface addresses are configured.
1661: .It Li ip6.defmcasthlim
1662: The default hop limit value for an IPv6 multicast packet sourced by the node.
1663: This value applies to all the transport protocols on top of IPv6.
1664: There are APIs to override the value, as documented in
1665: .Xr ip6 4 .
1666: .It Li ip6.forwarding
1667: If set to 1, enables IPv6 forwarding for the node,
1668: meaning that the node is acting as a router.
1669: If set to 0, disables IPv6 forwarding for the node,
1670: meaning that the node is acting as a host.
1671: IPv6 specification defines node behavior for
1672: .Dq router
1673: case and
1674: .Dq host
1675: case quite differently, and changing this variable during operation
1676: may cause serious trouble.
1677: It is recommended to configure the variable at bootstrap time,
1678: and bootstrap time only.
1679: .It Li ip6.gifhlim
1680: The maximum hop limit value for an IPv6 packet generated by
1681: .Xr gif 4
1682: tunnel interface.
1683: .It Li ip6.hdrnestlimit
1684: The number of IPv6 extension headers permitted on incoming IPv6 packets.
1685: If set to 0, the node will accept as many extension headers as possible.
1.7 liamjfoy 1686: .It Li ip6.hashsize
1687: The size of IPv6 Fast Forward hash table.
1.56 uwe 1688: This value must be a power of 2 (64, 256, ...).
1.7 liamjfoy 1689: A larger hash table size results in fewer collisions.
1690: Also see
1691: .Li ip6.maxflows .
1.1 pavel 1692: .It Li ip6.hlim
1693: The default hop limit value for an IPv6 unicast packet sourced by the node.
1694: This value applies to all the transport protocols on top of IPv6.
1695: There are APIs to override the value, as documented in
1696: .Xr ip6 4 .
1697: .It Li ip6.kame_version
1698: The string identifies the version of KAME IPv6 stack implemented in the kernel.
1699: .It Li ip6.keepfaith
1700: If set to non-zero, it enables
1701: .Dq FAITH
1702: TCP relay IPv6-to-IPv4 translator code in the kernel.
1703: Refer
1704: .Xr faith 4
1705: and
1706: .Xr faithd 8
1707: for detail.
1708: .It Li ip6.log_interval
1709: The variable controls amount of logs generated by IPv6 packet
1710: forwarding engine, by setting interval between log output
1711: .Pq in seconds .
1712: .It Li ip6.lowportmax
1713: The highest port number to use for TCP and UDP reserved port allocation.
1714: This cannot be set to less than 0 or greater than 1024, and must
1715: be greater than
1716: .Li ip6.lowportmin .
1717: .It Li ip6.lowportmin
1718: The lowest port number to use for TCP and UDP reserved port allocation.
1719: This cannot be set to less than 0 or greater than 1024, and must
1720: be smaller than
1721: .Li ip6.lowportmax .
1.73 ! christos 1722: .It Li ip6.maxdynroutes
! 1723: Maximum number of routes created by redirect.
! 1724: Set it to negative to disable.
! 1725: The default value is 4096.
! 1726: .It Li ip6.maxifprefixes
! 1727: Maximum number of prefixes created by route advertisements per interface.
! 1728: Set it to negative to disable.
! 1729: The default value is 16.
! 1730: .It Li ip6.maxifdefrouters 16
! 1731: Maximum number of default routers created by route advertisements per interface.
! 1732: Set it to negative to disable.
! 1733: The default value is 16.
1.5 liamjfoy 1734: .It Li ip6.maxflows
1735: IPv6 Fast Forwarding is enabled by default.
1736: If set to 0, IPv6 Fast Forwarding is disabled.
1737: .Li ip6.maxflows
1738: controls the maximum amount of flows which can be created.
1.6 liamjfoy 1739: The default value is 256.
1.1 pavel 1740: .It Li ip6.maxfragpackets
1741: The maximum number of fragmented packets the node will accept.
1742: 0 means that the node will not accept any fragmented packets.
1743: \-1 means that the node will accept as many fragmented packets as it receives.
1744: The flag is provided basically for avoiding possible DoS attacks.
1745: .It Li ip6.maxfrags
1746: The maximum number of fragments the node will accept.
1747: 0 means that the node will not accept any fragments.
1748: \-1 means that the node will accept as many fragments as it receives.
1749: The flag is provided basically for avoiding possible DoS attacks.
1.73 ! christos 1750: .It Li ip6.neighborgcthresh
! 1751: Maximum number of entries in neighbor cache.
! 1752: Set to negative to disable.
! 1753: The default value is 2048.
1.1 pavel 1754: .It Li ip6.redirect
1755: If set to 1, ICMPv6 redirects may be sent by the node.
1756: This option is ignored unless the node is routing IP packets,
1757: and should normally be enabled on all systems.
1758: .It Li ip6.rr_prune
1759: The variable specifies interval between IPv6 router renumbering prefix
1760: babysitting, in seconds.
1761: .It Li ip6.use_deprecated
1762: The variable controls use of deprecated address, specified in RFC 2462 5.5.4.
1763: .It Li ip6.v6only
1764: The variable specifies initial value for
1765: .Dv IPV6_V6ONLY
1766: socket option for
1767: .Dv AF_INET6
1768: socket.
1769: Please refer to
1770: .Xr ip6 4
1771: for detail.
1772: .It Li icmp6.errppslimit
1773: The variable specifies the maximum number of outgoing ICMPv6 error messages,
1774: per second.
1775: ICMPv6 error messages that exceeded the value are subject to rate limitation
1776: and will not go out from the node.
1777: Negative value disables rate limitation.
1778: .It Li icmp6.mtudisc_hiwat
1779: .It Li icmp6.mtudisc_lowat
1780: The variables define the maximum number of routing table entries,
1781: created due to path MTU discovery
1782: .Pq prevents denial-of-service attacks with ICMPv6 too big messages .
1783: When IPv6 path MTU discovery happens, we keep path MTU information into
1784: the routing table.
1785: If the number of routing table entries exceed the value,
1786: the kernel will not attempt to keep the path MTU information.
1787: .Li icmp6.mtudisc_hiwat
1788: is used when we have verified ICMPv6 too big messages.
1789: .Li icmp6.mtudisc_lowat
1790: is used when we have unverified ICMPv6 too big messages.
1791: Verification is performed by using address/port pairs kept in connected pcbs.
1792: Negative value disables the upper limit.
1793: .It Li icmp6.nd6_debug
1794: If set to non-zero, kernel IPv6 neighbor discovery code will generate
1795: debugging messages.
1796: The debug outputs are useful to diagnose IPv6 interoperability issues.
1797: The flag must be set to 0 for normal operation.
1798: .It Li icmp6.nd6_delay
1799: The variable specifies
1800: .Dv DELAY_FIRST_PROBE_TIME
1801: timing constant in IPv6 neighbor discovery specification
1802: .Pq RFC 2461 ,
1803: in seconds.
1804: .It Li icmp6.nd6_maxnudhint
1805: IPv6 neighbor discovery permits upper layer protocols to supply reachability
1806: hints, to avoid unnecessary neighbor discovery exchanges.
1807: The variable defines the number of consecutive hints the neighbor discovery
1808: layer will take.
1809: For example, by setting the variable to 3, neighbor discovery layer
1810: will take 3 consecutive hints in maximum.
1811: After receiving 3 hints, neighbor discovery layer will perform
1812: normal neighbor discovery process.
1813: .It Li icmp6.nd6_mmaxtries
1814: The variable specifies
1815: .Dv MAX_MULTICAST_SOLICIT
1816: constant in IPv6 neighbor discovery specification
1817: .Pq RFC 2461 .
1818: .It Li icmp6.nd6_prune
1819: The variable specifies interval between IPv6 neighbor cache babysitting,
1820: in seconds.
1821: .It Li icmp6.nd6_umaxtries
1822: The variable specifies
1823: .Dv MAX_UNICAST_SOLICIT
1824: constant in IPv6 neighbor discovery specification
1825: .Pq RFC 2461 .
1826: .It Li icmp6.nd6_useloopback
1827: If set to non-zero, kernel IPv6 stack will use loopback interface for
1828: local traffic.
1829: .It Li icmp6.nodeinfo
1830: The variable enables responses to ICMPv6 node information queries.
1831: If you set the variable to 0, responses will not be generated for
1832: ICMPv6 node information queries.
1833: Since node information queries can have a security impact, it is
1834: possible to fine tune which responses should be answered.
1835: Two separate bits can be set.
1836: .Bl -tag -width "12345"
1837: .It 1
1838: Respond to ICMPv6 FQDN queries, e.g.
1839: .Li ping6 -w .
1840: .It 2
1841: Respond to ICMPv6 node addresses queries, e.g.
1842: .Li ping6 -a .
1843: .El
1844: .It Li icmp6.rediraccept
1845: If set to non-zero, the host will accept ICMPv6 redirect packets.
1846: Note that IPv6 routers will never accept ICMPv6 redirect packets,
1847: and the variable is meaningful on IPv6 hosts
1848: .Pq non-router
1849: only.
1850: .It Li icmp6.redirtimeout
1851: The variable specifies lifetime of routing entries generated by incoming
1852: ICMPv6 redirect.
1853: .It Li udp6.do_loopback_cksum
1854: Perform UDP checksum on loopback.
1855: .It Li udp6.recvspace
1856: Default UDP receive buffer size.
1857: .It Li udp6.sendspace
1858: Default UDP send buffer size.
1859: .El
1860: .Pp
1861: We reuse net.*.tcp for
1862: .Tn TCP
1863: over
1864: .Tn IPv6 ,
1865: and therefore we do not have variables net.*.tcp6.
1866: Variables net.inet6.udp6 have identical meaning to net.inet.udp.
1867: Please refer to
1868: .Li PF_INET
1869: section above.
1870: For variables net.*.ipsec6, please refer to
1871: .Xr ipsec 4 .
1872: .It Li net.key ( PF_KEY )
1873: Get or set various global information about the IPsec key management.
1874: The third level name is the variable name.
1875: The currently defined variable and names are:
1.21 joerg 1876: .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
1.1 pavel 1877: .It Sy Variable name Type Changeable
1878: .It debug integer yes
1879: .It spi_try integer yes
1880: .It spi_min_value integer yes
1881: .It spi_max_value integer yes
1882: .It larval_lifetime integer yes
1883: .It blockacq_count integer yes
1884: .It blockacq_lifetime integer yes
1885: .It esp_keymin integer yes
1886: .It esp_auth integer yes
1887: .It ah_keymin integer yes
1888: .El
1.21 joerg 1889: .Pp
1.1 pavel 1890: The variables are as follows:
1891: .Bl -tag -width "123456"
1892: .It Li debug
1893: Turn on debugging message from within the kernel.
1894: The value is a bitmap, as defined in
1.56 uwe 1895: .In netkey/key_debug.h .
1.1 pavel 1896: .It Li spi_try
1897: The number of times the kernel will try to obtain an unique SPI
1898: when it generates it from random number generator.
1899: .It Li spi_min_value
1900: Minimum SPI value when generating it within the kernel.
1901: .It Li spi_max_value
1902: Maximum SPI value when generating it within the kernel.
1903: .It Li larval_lifetime
1904: Lifetime for LARVAL SAD entries, in seconds.
1905: .It Li blockacq_count
1906: Number of ACQUIRE PF_KEY messages to be blocked after an ACQUIRE message.
1907: It avoids flood of ACQUIRE PF_KEY from being sent from the kernel to the
1908: key management daemon.
1909: .It Li blockacq_lifetime
1910: Lifetime of ACQUIRE PF_KEY message.
1911: .It Li esp_keymin
1912: Minimum ESP key length, in bits.
1913: The value is used when the kernel creates proposal payload
1914: on ACQUIRE PF_KEY message.
1915: .It Li esp_auth
1916: Whether ESP authentication should be used or not.
1917: Non-zero value indicates that ESP authentication should be used.
1918: The value is used when the kernel creates proposal payload
1919: on ACQUIRE PF_KEY message.
1920: .It Li ah_keymin
1921: Minimum AH key length, in bits,
1922: The value is used when the kernel creates proposal payload
1923: on ACQUIRE PF_KEY message.
1924: .El
1925: .El
1.50 jruoho 1926: .Ss The proc.* subtree
1.1 pavel 1927: The string and integer information available for the
1928: .Li proc
1929: level is detailed below.
1930: The changeable column shows whether a process with appropriate
1931: privilege may change the value.
1932: These values are per-process,
1933: and as such may change from one process to another.
1934: When a process is created,
1935: the default values are inherited from its parent.
1936: When a set-user-ID or set-group-ID binary is executed, the
1937: value of PROC_PID_CORENAME is reset to the system default value.
1938: The second level name is either the magic value PROC_CURPROC, which
1939: points to the current process, or the PID of the target process.
1.21 joerg 1940: .Bl -column "proc.pid.corename" "string" "not applicable" -offset indent
1.1 pavel 1941: .It Sy Third level name Type Changeable
1942: .It proc.pid.corename string yes
1943: .It proc.pid.rlimit node not applicable
1944: .It proc.pid.stopfork int yes
1945: .It proc.pid.stopexec int yes
1946: .It proc.pid.stopexit int yes
1947: .El
1948: .Bl -tag -width "123456"
1949: .It Li proc.pid.corename ( PROC_PID_CORENAME )
1950: The template used for the core dump file name (see
1951: .Xr core 5
1952: for details).
1953: The base name must either be
1.56 uwe 1954: .Pa core
1955: or end with the suffix
1956: .Pa .core
1957: (the super-user may set arbitrary names).
1958: By default it points to
1959: .Dv KERN_DEFCORENAME .
1.1 pavel 1960: .It Li proc.pid.rlimit ( PROC_PID_LIMIT )
1961: Return resources limits, as defined for the
1962: .Xr getrlimit 2
1963: and
1964: .Xr setrlimit 2
1965: system calls.
1966: The fourth level name is one of:
1.56 uwe 1967: .Bl -tag -width "123456"
1.1 pavel 1968: .It Li proc.pid.rlimit.cputime ( PROC_PID_LIMIT_CPU )
1969: The maximum amount of CPU time (in seconds) to be used by each process.
1970: .It Li proc.pid.rlimit.filesize ( PROC_PID_LIMIT_FSIZE )
1971: The largest size (in bytes) file that may be created.
1972: .It Li proc.pid.rlimit.datasize ( PROC_PID_LIMIT_DATA )
1973: The maximum size (in bytes) of the data segment for a process;
1974: this defines how far a program may extend its break with the
1975: .Xr sbrk 2
1976: system call.
1977: .It Li proc.pid.rlimit.stacksize ( PROC_PID_LIMIT_STACK )
1978: The maximum size (in bytes) of the stack segment for a process;
1979: this defines how far a program's stack segment may be extended.
1980: Stack extension is performed automatically by the system.
1981: .It Li proc.pid.rlimit.coredumpsize ( PROC_PID_LIMIT_CORE )
1982: The largest size (in bytes)
1983: .Pa core
1984: file that may be created.
1985: .It Li proc.pid.rlimit.memoryuse ( PROC_PID_LIMIT_RSS )
1986: The maximum size (in bytes) to which a process's resident set size may
1987: grow.
1988: This imposes a limit on the amount of physical memory to be given to
1989: a process; if memory is tight, the system will prefer to take memory
1990: from processes that are exceeding their declared resident set size.
1991: .It Li proc.pid.rlimit.memorylocked ( PROC_PID_LIMIT_MEMLOCK )
1992: The maximum size (in bytes) which a process may lock into memory
1993: using the
1994: .Xr mlock 2
1995: function.
1996: .It Li proc.pid.rlimit.maxproc ( PROC_PID_LIMIT_NPROC )
1997: The maximum number of simultaneous processes for this user id.
1998: .It Li proc.pid.rlimit.descriptors ( PROC_PID_LIMIT_NOFILE )
1999: The maximum number of open files for this process.
1.22 snj 2000: .It Li proc.pid.rlimit.sbsize ( PROC_PID_LIMIT_SBSIZE )
2001: The maximum size (in bytes) of the socket buffers
2002: set by the
2003: .Xr setsockopt 2
2004: .Dv SO_RCVBUF
2005: and
2006: .Dv SO_SNDBUF
2007: options.
1.1 pavel 2008: .El
2009: .Pp
2010: The fifth level name is one of
1.56 uwe 2011: .Li soft ( PROC_PID_LIMIT_TYPE_SOFT )
2012: or
1.1 pavel 2013: .Li hard ( PROC_PID_LIMIT_TYPE_HARD ) ,
2014: to select respectively the soft or hard limit.
2015: Both are of type integer.
2016: .It Li proc.pid.stopfork ( PROC_PID_STOPFORK )
2017: If non zero, the process' children will be stopped after
2018: .Xr fork 2
2019: calls.
2020: The children is created in the SSTOP state and is never scheduled
2021: for running before being stopped.
2022: This feature helps attaching a process with a debugger such as
2023: .Xr gdb 1
2024: before it had the opportunity to actually do anything.
2025: .Pp
2026: This value is inherited by the process's children, and it also
2027: apply to emulation specific system calls that fork a new process, such as
2028: .Fn sproc
2029: or
2030: .Fn clone .
2031: .It Li proc.pid.stopexec ( PROC_PID_STOPEXEC )
2032: If non zero, the process will be stopped on next
2033: .Xr exec 3
2034: call.
2035: The process created by
2036: .Xr exec 3
2037: is created in the SSTOP state and is never scheduled for running
2038: before being stopped.
2039: This feature helps attaching a process with a debugger such as
2040: .Xr gdb 1
2041: before it had the opportunity to actually do anything.
2042: .Pp
2043: This value is inherited by the process's children.
2044: .It Li proc.pid.stopexit ( PROC_PID_STOPEXIT )
2045: If non zero, the process will be stopped on when it has cause to exit,
2046: either by way of calling
2047: .Xr exit 3 ,
2048: .Xr _exit 2 ,
2049: or by the receipt of a specific signal.
2050: The process is stopped before any of its resources or vm space is
2051: released allowing examination of the termination state of a process
2052: before it disappears.
2053: This feature can be used to examine the final conditions of the
2054: process's vmspace via
2055: .Xr pmap 1
2056: or its resource settings with
2057: .Xr sysctl 8
2058: before it disappears.
2059: .Pp
2060: This value is also inherited by the process's children.
2061: .El
1.50 jruoho 2062: .Ss The user.* subtree ( CTL_USER )
1.1 pavel 2063: The string and integer information available for the
2064: .Li user
2065: level is detailed below.
2066: The changeable column shows whether a process with appropriate
2067: privilege may change the value.
1.21 joerg 2068: .Bl -column "user.coll_weights_max" "integer" "Changeable" -offset indent
1.1 pavel 2069: .It Sy Second level name Type Changeable
2070: .It user.atexit_max integer no
2071: .It user.bc_base_max integer no
2072: .It user.bc_dim_max integer no
2073: .It user.bc_scale_max integer no
2074: .It user.bc_string_max integer no
2075: .It user.coll_weights_max integer no
2076: .It user.cs_path string no
2077: .It user.expr_nest_max integer no
2078: .It user.line_max integer no
2079: .It user.posix2_c_bind integer no
2080: .It user.posix2_c_dev integer no
2081: .It user.posix2_char_term integer no
2082: .It user.posix2_fort_dev integer no
2083: .It user.posix2_fort_run integer no
2084: .It user.posix2_localedef integer no
2085: .It user.posix2_sw_dev integer no
2086: .It user.posix2_upe integer no
2087: .It user.posix2_version integer no
2088: .It user.re_dup_max integer no
2089: .It user.stream_max integer no
2090: .It user.stream_max integer no
2091: .It user.tzname_max integer no
2092: .El
2093: .Bl -tag -width "123456"
2094: .It Li user.atexit_max ( USER_ATEXIT_MAX )
2095: The maximum number of functions that may be registered with
2096: .Xr atexit 3 .
2097: .It Li user.bc_base_max ( USER_BC_BASE_MAX )
2098: The maximum ibase/obase values in the
2099: .Xr bc 1
2100: utility.
2101: .It Li user.bc_dim_max ( USER_BC_DIM_MAX )
2102: The maximum array size in the
2103: .Xr bc 1
2104: utility.
2105: .It Li user.bc_scale_max ( USER_BC_SCALE_MAX )
2106: The maximum scale value in the
2107: .Xr bc 1
2108: utility.
2109: .It Li user.bc_string_max ( USER_BC_STRING_MAX )
2110: The maximum string length in the
2111: .Xr bc 1
2112: utility.
2113: .It Li user.coll_weights_max ( USER_COLL_WEIGHTS_MAX )
2114: The maximum number of weights that can be assigned to any entry of
2115: the LC_COLLATE order keyword in the locale definition file.
2116: .It Li user.cs_path ( USER_CS_PATH )
2117: Return a value for the
2118: .Ev PATH
2119: environment variable that finds all the standard utilities.
2120: .It Li user.expr_nest_max ( USER_EXPR_NEST_MAX )
2121: The maximum number of expressions that can be nested within
2122: parenthesis by the
2123: .Xr expr 1
2124: utility.
2125: .It Li user.line_max ( USER_LINE_MAX )
2126: The maximum length in bytes of a text-processing utility's input
2127: line.
2128: .It Li user.posix2_char_term ( USER_POSIX2_CHAR_TERM )
2129: Return 1 if the system supports at least one terminal type capable of
1.58 wiz 2130: all operations described in
2131: .St -p1003.2 ,
2132: otherwise\ 0.
1.1 pavel 2133: .It Li user.posix2_c_bind ( USER_POSIX2_C_BIND )
2134: Return 1 if the system's C-language development facilities support the
1.56 uwe 2135: C-Language Bindings Option, otherwise\ 0.
1.1 pavel 2136: .It Li user.posix2_c_dev ( USER_POSIX2_C_DEV )
2137: Return 1 if the system supports the C-Language Development Utilities Option,
1.56 uwe 2138: otherwise\ 0.
1.1 pavel 2139: .It Li user.posix2_fort_dev ( USER_POSIX2_FORT_DEV )
2140: Return 1 if the system supports the FORTRAN Development Utilities Option,
1.56 uwe 2141: otherwise\ 0.
1.1 pavel 2142: .It Li user.posix2_fort_run ( USER_POSIX2_FORT_RUN )
2143: Return 1 if the system supports the FORTRAN Runtime Utilities Option,
1.56 uwe 2144: otherwise\ 0.
1.1 pavel 2145: .It Li user.posix2_localedef ( USER_POSIX2_LOCALEDEF )
1.56 uwe 2146: Return 1 if the system supports the creation of locales, otherwise\ 0.
1.1 pavel 2147: .It Li user.posix2_sw_dev ( USER_POSIX2_SW_DEV )
2148: Return 1 if the system supports the Software Development Utilities Option,
1.56 uwe 2149: otherwise\ 0.
1.1 pavel 2150: .It Li user.posix2_upe ( USER_POSIX2_UPE )
2151: Return 1 if the system supports the User Portability Utilities Option,
1.56 uwe 2152: otherwise\ 0.
1.1 pavel 2153: .It Li user.posix2_version ( USER_POSIX2_VERSION )
1.58 wiz 2154: The version of
2155: .St -p1003.2
2156: with which the system attempts to comply.
1.1 pavel 2157: .It Li user.re_dup_max ( USER_RE_DUP_MAX )
2158: The maximum number of repeated occurrences of a regular expression
2159: permitted when using interval notation.
2160: .It Li user.stream_max ( USER_STREAM_MAX )
2161: The minimum maximum number of streams that a process may have open
2162: at any one time.
2163: .It Li user.tzname_max ( USER_TZNAME_MAX )
2164: The minimum maximum number of types supported for the name of a
2165: timezone.
2166: .El
1.50 jruoho 2167: .Ss The vm.* subtree ( CTL_VM )
1.1 pavel 2168: The string and integer information available for the
2169: .Li vm
2170: level is detailed below.
2171: The changeable column shows whether a process with appropriate
2172: privilege may change the value.
1.21 joerg 2173: .Bl -column "Second level name" "struct uvmexp_sysctl" "Changeable" -offset indent
1.1 pavel 2174: .It Sy Second level name Type Changeable
2175: .It vm.anonmax int yes
2176: .It vm.anonmin int yes
2177: .It vm.bufcache int yes
2178: .It vm.bufmem int no
2179: .It vm.bufmem_hiwater int yes
2180: .It vm.bufmem_lowater int yes
2181: .It vm.execmax int yes
2182: .It vm.execmin int yes
2183: .It vm.filemax int yes
2184: .It vm.filemin int yes
2185: .It vm.loadavg struct loadavg no
2186: .It vm.maxslp int no
2187: .It vm.nkmempages int no
2188: .It vm.uspace int no
2189: .It vm.uvmexp struct uvmexp no
2190: .It vm.uvmexp2 struct uvmexp_sysctl no
2191: .It vm.vmmeter struct vmtotal no
2192: .El
2193: .Pp
2194: .Bl -tag -width "123456"
2195: .It Li vm.anonmax ( VM_ANONMAX )
2196: The percentage of physical memory which will be reclaimed
2197: from other types of memory usage to store anonymous application data.
2198: .It Li vm.anonmin ( VM_ANONMIN )
2199: The percentage of physical memory which will be always be available for
2200: anonymous application data.
2201: .It Li vm.bufcache ( VM_BUFCACHE )
2202: The percentage of physical memory which will be available
2203: for the buffer cache.
2204: .It Li vm.bufmem ( VM_BUFMEM )
2205: The amount of kernel memory that is being used by the buffer cache.
2206: .It Li vm.bufmem_lowater ( VM_BUFMEM_LOWATER )
2207: The minimum amount of kernel memory to reserve for the
2208: buffer cache.
2209: .It Li vm.bufmem_hiwater ( VM_BUFMEM_HIWATER )
2210: The maximum amount of kernel memory to be used for the
2211: buffer cache.
2212: .It Li vm.execmax ( VM_EXECMAX )
2213: The percentage of physical memory which will be reclaimed
2214: from other types of memory usage to store cached executable data.
2215: .It Li vm.execmin ( VM_EXECMIN )
2216: The percentage of physical memory which will be always be available for
2217: cached executable data.
2218: .It Li vm.filemax ( VM_FILEMAX )
2219: The percentage of physical memory which will be reclaimed
2220: from other types of memory usage to store cached file data.
2221: .It Li vm.filemin ( VM_FILEMIN )
2222: The percentage of physical memory which will be always be available for
2223: cached file data.
2224: .It Li vm.loadavg ( VM_LOADAVG )
2225: Return the load average history.
2226: The returned data consists of a
1.56 uwe 2227: .Vt struct loadavg .
1.1 pavel 2228: .It Li vm.maxslp ( VM_MAXSLP )
2229: The value of the maxslp kernel global variable.
2230: .It Li vm.vmmeter ( VM_METER )
2231: Return system wide virtual memory statistics.
2232: The returned data consists of a
1.56 uwe 2233: .Vt struct vmtotal .
1.31 drochner 2234: .It vm.user_va0_disable
1.56 uwe 2235: A flag which controls whether user processes can map virtual address\ 0.
1.1 pavel 2236: .It Li vm.uspace ( VM_USPACE )
2237: The number of bytes allocated for each kernel stack.
2238: .It Li vm.uvmexp ( VM_UVMEXP )
2239: Return system wide virtual memory statistics.
2240: The returned data consists of a
1.56 uwe 2241: .Vt struct uvmexp .
1.1 pavel 2242: .It Li vm.uvmexp2 ( VM_UVMEXP2 )
2243: Return system wide virtual memory statistics.
2244: The returned data consists of a
1.56 uwe 2245: .Vt struct uvmexp_sysctl .
1.1 pavel 2246: .\" XXX vm.idlezero
2247: .El
1.50 jruoho 2248: .Ss The ddb.* subtree ( CTL_DDB )
1.34 jruoho 2249: The information available for the
1.1 pavel 2250: .Li ddb
2251: level is detailed below.
2252: The changeable column shows whether a process with appropriate
2253: privilege may change the value.
2254: .\" XXX sort
1.21 joerg 2255: .Bl -column "Second level name" "integer" "Changeable" -offset indent
1.1 pavel 2256: .It Sy Second level name Type Changeable
2257: .It ddb.radix integer yes
2258: .It ddb.maxoff integer yes
1.34 jruoho 2259: .It ddb.maxwidth integer yes
1.1 pavel 2260: .It ddb.lines integer yes
2261: .It ddb.tabstops integer yes
2262: .It ddb.onpanic integer yes
2263: .It ddb.fromconsole integer yes
1.34 jruoho 2264: .It ddb.tee_msgbuf integer yes
2265: .It ddb.commandonenter string yes
1.1 pavel 2266: .El
2267: .Pp
2268: .Bl -tag -width "123456"
1.35 jruoho 2269: .It Li ddb.radix ( DDBCTL_RADIX )
1.1 pavel 2270: The input and output radix.
1.35 jruoho 2271: .It Li ddb.maxoff ( DDBCTL_MAXOFF )
1.1 pavel 2272: The maximum symbol offset.
1.34 jruoho 2273: .It Li ddb.maxwidth ( DDBCTL_MAXWIDTH )
2274: The maximum output line width.
1.35 jruoho 2275: .It Li ddb.lines ( DDBCTL_LINES )
1.1 pavel 2276: Number of display lines.
1.35 jruoho 2277: .It Li ddb.tabstops ( DDBCTL_TABSTOPS )
1.1 pavel 2278: Tab width.
1.35 jruoho 2279: .It Li ddb.onpanic ( DDBCTL_ONPANIC )
1.63 riz 2280: If greater than zero, DDB will be entered if the kernel panics.
2281: A value of 1 causes the system to enter DDB on panic, while a value of 2
2282: causes the kernel to attempt to print out a stack trace before entering DDB.
2283: A value of 0 causes the kernel to attempt to print a stack trace, then
1.64 wiz 2284: reboot, while a value of \-1 means neither a stack trace will be printed
1.63 riz 2285: nor DDB entered.
1.35 jruoho 2286: .It Li ddb.fromconsole ( DDBCTL_FROMCONSOLE )
1.1 pavel 2287: If not zero, DDB may be entered by sending a break on a serial
2288: console or by a special key sequence on a graphics console.
1.34 jruoho 2289: .It Li ddb.tee_msgbuf
2290: If not zero, DDB will output also to the kernel message buffer.
2291: .It Li ddb.commandonenter
2292: If not empty, a command to be executed on each enter to the
2293: .Tn DDB .
2294: .\"
2295: .\" XXX: (a) ddb.commandonenter is missing in ddb(4);
2296: .\" (b) No DDBCTL definitions for tee_msgbuf and commandonenter.
1.1 pavel 2297: .El
2298: .Pp
1.34 jruoho 2299: Some of these
2300: .Tn MIB
2301: nodes are also available as variables from within the debugger.
1.1 pavel 2302: See
2303: .Xr ddb 4
2304: for more details.
1.50 jruoho 2305: .Ss The security.* subtree ( CTL_SECURITY )
1.1 pavel 2306: The
2307: .Li security
2308: level contains various security-related settings for
1.2 wiz 2309: the system.
1.43 jruoho 2310: The available second level names are:
2311: .Bl -column "Second level name" "integer" "Changeable" -offset indent
2312: .It Sy Second level name Type Changeable
2313: .It Li security.curtain integer yes
2314: .It Li security.models node not applicable
2315: .It Li security.pax node not applicable
2316: .El
2317: .Pp
1.2 wiz 2318: Available settings are detailed below.
1.1 pavel 2319: .Pp
2320: .Bl -tag -width "123456"
2321: .It Li security.curtain
1.43 jruoho 2322: If non-zero, will filter return objects according to the user
2323: .Tn ID
1.1 pavel 2324: requesting information about them, preventing from users any
1.43 jruoho 2325: access to objects they do not own.
1.1 pavel 2326: .Pp
2327: At the moment, it affects
2328: .Xr ps 1 ,
2329: .Xr netstat 1
2330: (for
2331: .Dv PF_INET ,
2332: .Dv PF_INET6 ,
2333: and
2334: .Dv PF_UNIX
2335: PCBs), and
2336: .Xr w 1 .
1.4 elad 2337: .It Li security.models
2338: .Nx
2339: supports pluggable security models.
1.17 ad 2340: Every security model used, whether if loaded as a module or built with the system,
1.4 elad 2341: is required to add an entry to this node with at least one element,
2342: .Dq name ,
2343: indicating the name of the security model.
2344: .Pp
2345: In addition to the name, any settings and other information private to the
2346: security model will be available under this node.
2347: See
2348: .Xr secmodel 9
2349: for more information.
1.1 pavel 2350: .It Li security.pax
2351: Settings for PaX -- exploit mitigation features.
1.4 elad 2352: For more information on any of the PaX features, please see
2353: .Xr paxctl 8
2354: and
1.62 jruoho 2355: .Xr security 7 .
1.43 jruoho 2356: The available third and fourth level names are:
2357: .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \
2358: -offset 2n
2359: .It Sy Third and fourth level names Ta Sy Type Ta Sy Changeable
2360: .It Li security.pax.aslr.enabled integer yes
2361: .\".It Li security.pax.aslr.exec_len integer yes
2362: .It Li security.pax.aslr.global integer yes
2363: .\".It Li security.pax.aslr.mmap_len integer yes
2364: .\".It Li security.pax.aslr.stack_len integer yes
2365: .It Li security.pax.mprotect.enabled integer yes
2366: .It Li security.pax.mprotect.global integer yes
2367: .It Li security.pax.segvguard.enabled integer yes
2368: .It Li security.pax.segvguard.expiry_timeout integer yes
2369: .It Li security.pax.segvguard.global integer yes
2370: .It Li security.pax.segvguard.max_crashes integer yes
2371: .It Li security.pax.segvguard.suspend_timeout integer yes
2372: .El
1.1 pavel 2373: .Pp
2374: .Bl -tag -width "123456"
1.43 jruoho 2375: .It Li security.pax.aslr.enabled
1.14 elad 2376: Enable PaX ASLR (Address Space Layout Randomization).
2377: .Pp
2378: The value of this
2379: knob must be non-zero for PaX ASLR to be enabled, even if a program is set to
2380: explicit enable.
1.43 jruoho 2381: .\".It Li security.pax.aslr.exec_len
2382: .\" XXX: Undocumented.
1.14 elad 2383: .It Li security.pax.aslr.global
2384: Specifies the default global policy for programs without an
2385: explicit enable/disable flag.
2386: .Pp
2387: When non-zero, all programs will get PaX ASLR, except those exempted with
1.69 wiz 2388: .Xr paxctl 8 .
1.14 elad 2389: Otherwise, all programs will not get PaX ASLR, except those specifically
2390: marked as such with
2391: .Xr paxctl 8 .
1.43 jruoho 2392: .\".It Li security.pax.aslr.mmap_len
2393: .\" XXX: Undocumented.
2394: .\" .It Li security.pax.aslr.stack_len
2395: .\" XXX: Undocumented.
2396: .It Li security.pax.mprotect.enabled
1.1 pavel 2397: Enable PaX MPROTECT restrictions.
2398: .Pp
2399: These are
2400: .Xr mprotect 2
1.2 wiz 2401: restrictions to better enforce a W^X policy.
2402: The value of this
1.1 pavel 2403: knob must be non-zero for PaX MPROTECT to be enabled, even if a
2404: program is set to explicit enable.
2405: .It Li security.pax.mprotect.global
2406: Specifies the default global policy for programs without an
2407: explicit enable/disable flag.
2408: .Pp
2409: When non-zero, all programs will get the PaX MPROTECT restrictions,
2410: except those exempted with
1.69 wiz 2411: .Xr paxctl 8 .
1.1 pavel 2412: Otherwise, all programs will not get the PaX MPROTECT restrictions,
2413: except those specifically marked as such with
1.4 elad 2414: .Xr paxctl 8 .
1.43 jruoho 2415: .It Li security.pax.segvguard.enabled
1.1 pavel 2416: Enable PaX Segvguard.
2417: .Pp
2418: PaX Segvguard can detect and prevent certain exploitation attempts, where
2419: an attacker may try for example to brute-force function return addresses
2420: of respawning daemons.
2421: .Pp
2422: .Em Note :
2423: The
2424: .Nx
2425: interface and implementation of the Segvguard is still experimental, and may
2426: change in future releases.
1.43 jruoho 2427: .It Li security.pax.segvguard.expiry_timeout
2428: If the max number was not reached within this timeout (in seconds), the entry
2429: will expire.
1.1 pavel 2430: .It Li security.pax.segvguard.global
2431: Specifies the default global policy for programs without an
2432: explicit enable/disable flag.
2433: .Pp
2434: When non-zero, all programs will get the PaX Segvguard,
2435: except those exempted with
1.69 wiz 2436: .Xr paxctl 8 .
1.2 wiz 2437: Otherwise, no program will get the PaX Segvguard restrictions,
1.1 pavel 2438: except those specifically marked as such with
1.4 elad 2439: .Xr paxctl 8 .
1.43 jruoho 2440: .It Li security.pax.segvguard.max_crashes
2441: The maximum number of segfaults a program can receive before suspension.
1.1 pavel 2442: .It Li security.pax.segvguard.suspend_timeout
2443: Number of seconds to suspend a user from running a faulting program when the
2444: limit was exceeded.
2445: .El
2446: .El
1.50 jruoho 2447: .Ss The vendor.* subtree ( CTL_VENDOR )
1.1 pavel 2448: The
2449: .Li vendor
2450: toplevel name is reserved to be used by vendors who wish to
2451: have their own private MIB tree.
2452: Intended use is to store values under
2453: .Dq vendor.\*[Lt]yourname\*[Gt].* .
2454: .Sh SEE ALSO
2455: .Xr sysctl 3 ,
2456: .Xr ipsec 4 ,
2457: .Xr tcp 4 ,
1.62 jruoho 2458: .Xr security 7 ,
1.1 pavel 2459: .Xr sysctl 8
2460: .Sh HISTORY
2461: The
2462: .Nm
2463: variables first appeared in
2464: .Bx 4.4 .
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