Annotation of src/share/man/man7/sysctl.7, Revision 1.69
1.69 ! wiz 1: .\" $NetBSD: sysctl.7,v 1.68 2011/11/03 00:29:00 jym Exp $
1.1 pavel 2: .\"
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30: .\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95
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1.67 christos 32: .Dd September 24, 2011
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
309: .It kern.maxpartitions integer no
310: .It kern.maxphys integer no
311: .It kern.maxproc integer yes
312: .It kern.maxptys integer yes
313: .It kern.maxvnodes integer yes
314: .It kern.mbuf node not applicable
315: .It kern.memlock integer no
1.21 joerg 316: .It kern.memlock_range integer no
317: .It kern.memory_protection integer no
1.42 jruoho 318: .It kern.module node not applicable
1.21 joerg 319: .It kern.monotonic_clock integer no
1.49 jruoho 320: .It kern.mqueue node not applicable
1.1 pavel 321: .It kern.msgbuf integer no
322: .It kern.msgbufsize integer no
323: .It kern.ngroups integer no
1.41 jruoho 324: .\".It kern.no_sa_support integer yes
1.1 pavel 325: .It kern.ntptime struct ntptimeval no
326: .It kern.osrelease string no
1.39 jruoho 327: .It kern.osrevision integer no
1.1 pavel 328: .It kern.ostype string no
1.41 jruoho 329: .\".It kern.panic_now integer yes
1.1 pavel 330: .It kern.pipe node not applicable
1.39 jruoho 331: .\" .It kern.posix node not applicable
332: .It kern.posix1version integer no
1.51 jruoho 333: .It kern.posix_aio integer no
1.21 joerg 334: .It kern.posix_barriers integer no
335: .It kern.posix_reader_writer_locks integer no
1.39 jruoho 336: .\".It kern.posix_sched integer yes
1.21 joerg 337: .It kern.posix_semaphores integer no
338: .It kern.posix_spin_locks integer no
339: .It kern.posix_threads integer no
340: .It kern.posix_timers integer no
1.1 pavel 341: .It kern.proc struct kinfo_proc no
342: .It kern.proc2 struct kinfo_proc2 no
1.21 joerg 343: .It kern.proc_args string no
1.39 jruoho 344: .It kern.profiling node not applicable
1.41 jruoho 345: .\".It kern.pset node not applicable
1.1 pavel 346: .It kern.rawpartition integer no
1.21 joerg 347: .It kern.root_device string no
348: .It kern.root_partition integer no
349: .It kern.rtc_offset integer yes
350: .It kern.saved_ids integer no
1.39 jruoho 351: .It kern.sbmax integer yes
1.41 jruoho 352: .\".It kern.sched node not applicable
1.1 pavel 353: .It kern.securelevel integer raise only
1.39 jruoho 354: .It kern.somaxkva integer yes
1.21 joerg 355: .It kern.synchronized_io integer no
1.19 christos 356: .It kern.timecounter node not applicable
1.1 pavel 357: .It kern.timex struct no
358: .It kern.tkstat node not applicable
1.66 christos 359: .It kern.tty node not applicable
1.1 pavel 360: .It kern.urandom integer no
1.45 jruoho 361: .It kern.usercrypto integer yes
362: .It kern.userasymcrypto integer yes
1.39 jruoho 363: .It kern.veriexec node not applicable
1.1 pavel 364: .It kern.version string no
365: .It kern.vnode struct vnode no
366: .El
367: .Bl -tag -width "123456"
1.51 jruoho 368: .It Li kern.aio_listio_max
369: The maximum number of asynchronous
370: .Tn I/O
371: operations in a single list I/O call.
372: Like with all variables related to
373: .Xr aio 3 ,
374: the variable may be created and removed dynamically
375: upon loading or unloading the corresponding kernel module.
376: .It Li kern.aio_max
377: The maximum number of asynchronous I/O operations.
1.44 jruoho 378: .It Li kern.arandom
379: This variable picks a random number each time it is queried.
380: The used random number generator
1.56 uwe 381: .Pf ( Tn RNG )
1.44 jruoho 382: is based on
383: .Xr arc4random 3 .
1.1 pavel 384: .It Li kern.argmax ( KERN_ARGMAX )
385: The maximum bytes of argument to
386: .Xr execve 2 .
1.23 apb 387: .It Li kern.boothowto
388: Flags passed from the boot loader; see
389: .Xr reboot 2
390: for the meanings of the flags.
1.1 pavel 391: .It Li kern.boottime ( KERN_BOOTTIME )
392: A
1.56 uwe 393: .Vt struct timeval
1.1 pavel 394: structure is returned.
395: This structure contains the time that the system was booted.
1.41 jruoho 396: .\" .It Li kern.bufq
397: .\" XXX: Undocumented.
1.1 pavel 398: .It Li kern.ccpu ( KERN_CCPU )
399: The scheduler exponential decay value.
400: .It Li kern.clockrate ( KERN_CLOCKRATE )
401: A
1.56 uwe 402: .Vt struct clockinfo
1.1 pavel 403: structure is returned.
404: This structure contains the clock, statistics clock and profiling clock
405: frequencies, the number of micro-seconds per hz tick, and the clock
406: skew rate.
1.36 jruoho 407: Refer to
408: .Xr hz 9
409: for additional details.
1.1 pavel 410: .It Li kern.consdev ( KERN_CONSDEV )
411: Console device.
1.39 jruoho 412: .It Li kern.coredump
413: Settings related to set-id processes coredumps.
414: By default, set-id processes do not dump core in situations where
415: other processes would.
416: The settings in this node allows an administrator to change this
417: behavior.
418: .Pp
419: The third level name is
420: .Dv kern.coredump.setid
1.40 jruoho 421: and fourth level variables are described below.
422: .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent
423: .It Sy Fourth level name Type Changeable
424: .It kern.coredump.setid.dump integer yes
425: .It kern.coredump.setid.group integer yes
426: .It kern.coredump.setid.mode integer yes
427: .It kern.coredump.setid.owner integer yes
428: .It kern.coredump.setid.path string yes
429: .El
1.39 jruoho 430: .Bl -tag -width "123456"
431: .It Li kern.coredump.setid.dump
432: If non-zero, set-id processes will dump core.
433: .It Li kern.coredump.setid.group
434: The group-id for the set-id processes' coredump.
435: .It Li kern.coredump.setid.mode
436: The mode for the set-id processes' coredump.
437: See
438: .Xr chmod 1 .
439: .It Li kern.coredump.setid.owner
440: The user-id that will be used as the owner of the set-id processes'
441: coredump.
442: .It Li kern.coredump.setid.path
443: The path to which set-id processes' coredumps will be saved to.
444: Same syntax as kern.defcorename.
445: .El
1.1 pavel 446: .It Li kern.cp_id ( KERN_CP_ID )
447: Mapping of CPU number to CPU id.
448: .It Li kern.cp_time ( KERN_CP_TIME )
1.56 uwe 449: Returns an array of
450: .Dv CPUSTATES
451: .Vt uint64_t Ns s.
1.1 pavel 452: This array contains the
453: number of clock ticks spent in different CPU states.
454: On multi-processor systems, the sum across all CPUs is returned unless
455: appropriate space is given for one data set for each CPU.
456: Data for a specific CPU can also be obtained by adding the number of the
457: CPU at the end of the MIB, enlarging it by one.
1.46 jruoho 458: .It Li kern.cryptodevallowsoft
459: This variable controls userland access to hardware versus software transforms
460: in the
461: .Xr crypto 4
462: system.
463: The available values are as follows:
1.47 wiz 464: .Bl -tag -width XX0 -offset indent
465: .It Dv \*[Lt] 0
1.46 jruoho 466: Always force userlevel requests to use software transforms.
467: .It Dv = 0
468: If present, use hardware and grant userlevel requests for
469: non-accelerated transforms (handling the latter in software).
1.47 wiz 470: .It Dv \*[Gt] 0
1.46 jruoho 471: Allow user requests only for transforms which are hardware-accelerated.
472: .El
1.1 pavel 473: .It Li kern.defcorename ( KERN_DEFCORENAME )
474: Default template for the name of core dump files (see also
475: .Li proc.pid.corename
476: in the per-process variables
477: .Li proc.* ,
478: and
479: .Xr core 5
480: for format of this template).
481: The default value is
1.56 uwe 482: .Pa %n.core
1.1 pavel 483: and can be changed with the kernel configuration option
484: .Cd options DEFCORENAME
485: (see
486: .Xr options 4
487: ).
1.38 jruoho 488: .It Li kern.detachall
489: Detach all devices at shutdown.
1.1 pavel 490: .It Li kern.domainname ( KERN_DOMAINNAME )
491: Get or set the YP domain name.
492: .It Li kern.drivers ( KERN_DRIVERS )
493: Return an array of
1.56 uwe 494: .Vt struct kinfo_drivers
1.1 pavel 495: that contains the name and major device numbers of all the device drivers
496: in the current kernel.
497: The
498: .Va d_name
499: field is always a NUL terminated string.
500: The
501: .Va d_bmajor
502: field will be set to \-1 if the driver doesn't have a block device.
1.39 jruoho 503: .It Li kern.dump_on_panic ( KERN_DUMP_ON_PANIC )
1.41 jruoho 504: Perform a crash dump on system
505: .Xr panic 9 .
1.1 pavel 506: .It Li kern.file ( KERN_FILE )
507: Return the entire file table.
508: The returned data consists of a single
1.56 uwe 509: .Vt struct filelist
1.1 pavel 510: followed by an array of
1.56 uwe 511: .Vt struct file ,
1.1 pavel 512: whose size depends on the current number of such objects in the system.
513: .It Li kern.forkfsleep ( KERN_FORKFSLEEP )
514: If
515: .Xr fork 2
516: system call fails due to limit on number of processes (either
517: the global maxproc limit or user's one), wait for this many
518: milliseconds before returning
519: .Er EAGAIN
520: error to process.
521: Useful to keep heavily forking runaway processes in bay.
522: Default zero (no sleep).
523: Maximum is 20 seconds.
524: .It Li kern.fscale ( KERN_FSCALE )
525: The kernel fixed-point scale factor.
526: .It Li kern.fsync ( KERN_FSYNC )
1.58 wiz 527: Return 1 if the
528: .St -p1003.1b-93
529: File Synchronization Option is available
1.1 pavel 530: on this system,
1.56 uwe 531: otherwise\ 0.
1.1 pavel 532: .It Li kern.hardclock_ticks ( KERN_HARDCLOCK_TICKS )
533: Returns the number of
534: .Xr hardclock 9
535: ticks.
536: .It Li kern.hostid ( KERN_HOSTID )
1.39 jruoho 537: Get or set the host identifier.
538: This is aimed to replace the legacy
539: .Xr gethostid 3
540: and
541: .Xr sethostid 3
542: system calls.
1.1 pavel 543: .It Li kern.hostname ( KERN_HOSTNAME )
1.39 jruoho 544: Get or set the
545: .Xr hostname 1 .
1.1 pavel 546: .It Li kern.iov_max ( KERN_IOV_MAX )
547: Return the maximum number of
1.56 uwe 548: .Vt iovec
1.1 pavel 549: structures that a process has available for use with
550: .Xr preadv 2 ,
551: .Xr pwritev 2 ,
552: .Xr readv 2 ,
553: .Xr recvmsg 2 ,
554: .Xr sendmsg 2
555: and
556: .Xr writev 2 .
1.39 jruoho 557: .It Li kern.ipc ( KERN_SYSVIPC )
558: Return information about the SysV IPC parameters.
559: The third level names for the ipc variables are detailed below.
560: .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent
561: .It Sy Third level name Type Changeable
562: .It kern.ipc.sysvmsg integer no
563: .It kern.ipc.sysvsem integer no
564: .It kern.ipc.sysvshm integer no
565: .It kern.ipc.sysvipc_info struct no
566: .It kern.ipc.shmmax integer yes
567: .It kern.ipc.shmmni integer yes
568: .It kern.ipc.shmseg integer yes
569: .It kern.ipc.shmmaxpgs integer yes
570: .It kern.ipc.shm_use_phys integer yes
571: .It kern.ipc.msgmni integer yes
572: .It kern.ipc.msgseg integer yes
573: .It kern.ipc.semmni integer yes
574: .It kern.ipc.semmns integer yes
575: .It kern.ipc.semmnu integer yes
576: .El
577: .Bl -tag -width "123456"
578: .It Li kern.ipc.sysvmsg ( KERN_SYSVIPC_MSG )
579: Returns 1 if System V style message queue functionality is available
580: on this system,
1.56 uwe 581: otherwise\ 0.
1.39 jruoho 582: .It Li kern.ipc.sysvsem ( KERN_SYSVIPC_SEM )
583: Returns 1 if System V style semaphore functionality is available
584: on this system,
1.56 uwe 585: otherwise\ 0.
1.39 jruoho 586: .It Li kern.ipc.sysvshm ( KERN_SYSVIPC_SHM )
587: Returns 1 if System V style share memory functionality is available
588: on this system,
1.56 uwe 589: otherwise\ 0.
1.39 jruoho 590: .It Li kern.ipc.sysvipc_info ( KERN_SYSVIPC_INFO )
591: Return System V style IPC configuration and run-time information.
592: The fourth level name selects the System V style IPC facility.
593: .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent
594: .It Sy Fourth level name Type
595: .It KERN_SYSVIPC_MSG_INFO struct msg_sysctl_info
596: .It KERN_SYSVIPC_SEM_INFO struct sem_sysctl_info
597: .It KERN_SYSVIPC_SHM_INFO struct shm_sysctl_info
598: .El
599: .Pp
600: .Bl -tag -width "123456"
601: .It Li KERN_SYSVIPC_MSG_INFO
602: Return information on the System V style message facility.
603: The
604: .Sy msg_sysctl_info
605: structure is defined in
606: .In sys/msg.h .
607: .It Li KERN_SYSVIPC_SEM_INFO
608: Return information on the System V style semaphore facility.
609: The
610: .Sy sem_sysctl_info
611: structure is defined in
612: .In sys/sem.h .
613: .It Li KERN_SYSVIPC_SHM_INFO
614: Return information on the System V style shared memory facility.
615: The
616: .Sy shm_sysctl_info
617: structure is defined in
618: .In sys/shm.h .
619: .El
620: .It Li kern.ipc.shmmax ( KERN_SYSVIPC_SHMMAX )
621: Max shared memory segment size in bytes.
622: .It Li kern.ipc.shmmni ( KERN_SYSVIPC_SHMMNI )
623: Max number of shared memory identifiers.
624: .It Li kern.ipc.shmseg ( KERN_SYSVIPC_SHMSEG )
625: Max shared memory segments per process.
626: .It Li kern.ipc.shmmaxpgs ( KERN_SYSVIPC_SHMMAXPGS )
627: Max amount of shared memory in pages.
628: .It Li kern.ipc.shm_use_phys ( KERN_SYSVIPC_SHMUSEPHYS )
629: Locking of shared memory in physical memory.
630: If 0, memory can be swapped
631: out, otherwise it will be locked in physical memory.
632: .It Li kern.ipc.msgmni
633: Max number of message queue identifiers.
634: .It Li kern.ipc.msgseg
635: Max number of number of message segments.
636: .It Li kern.ipc.semmni
637: Max number of number of semaphore identifiers.
638: .It Li kern.ipc.semmns
639: Max number of number of semaphores in system.
640: .It Li kern.ipc.semmnu
641: Max number of undo structures in system.
642: .El
1.1 pavel 643: .It Li kern.job_control ( KERN_JOB_CONTROL )
1.56 uwe 644: Return 1 if job control is available on this system, otherwise\ 0.
1.1 pavel 645: .It Li kern.labeloffset ( KERN_LABELOFFSET )
1.56 uwe 646: The offset within the sector specified by
647: .Dv KERN_LABELSECTOR
648: of the
1.1 pavel 649: .Xr disklabel 5 .
650: .It Li kern.labelsector ( KERN_LABELSECTOR )
651: The sector number containing the
652: .Xr disklabel 5 .
653: .It Li kern.login_name_max ( KERN_LOGIN_NAME_MAX )
654: The size of the storage required for a login name, in bytes,
655: including the terminating NUL.
656: .It Li kern.logsigexit ( KERN_LOGSIGEXIT )
657: If this flag is non-zero, the kernel will
658: .Xr log 9
659: all process exits due to signals which create a
660: .Xr core 5
661: file, and whether the coredump was created.
662: .It Li kern.mapped_files ( KERN_MAPPED_FILES )
1.58 wiz 663: Returns 1 if the
664: .St -p1003.1b-93
665: Memory Mapped Files Option is available on this system,
1.56 uwe 666: otherwise\ 0.
1.1 pavel 667: .It Li kern.maxfiles ( KERN_MAXFILES )
668: The maximum number of open files that may be open in the system.
669: .It Li kern.maxpartitions ( KERN_MAXPARTITIONS )
670: The maximum number of partitions allowed per disk.
671: .It Li kern.maxphys ( KERN_MAXPHYS )
672: Maximum raw I/O transfer size.
673: .It Li kern.maxproc ( KERN_MAXPROC )
674: The maximum number of simultaneous processes the system will allow.
675: .It Li kern.maxptys ( KERN_MAXPTYS )
676: The maximum number of pseudo terminals.
677: This value can be both raised and lowered, though it cannot
678: be set lower than number of currently used ptys.
679: See also
680: .Xr pty 4 .
681: .It Li kern.maxvnodes ( KERN_MAXVNODES )
682: The maximum number of vnodes available on the system.
683: This can only be raised.
684: .It Li kern.mbuf ( KERN_MBUF )
685: Return information about the mbuf control variables.
686: Mbufs are data structures which store network packets and other data
687: structures in the networking code, see
688: .Xr mbuf 9 .
689: The third level names for the mbuf variables are detailed below.
690: The changeable column shows whether a process with appropriate
691: privilege may change the value.
1.21 joerg 692: .Bl -column "kern.mbuf.nmbclusters" "integer" "Changeable" -offset indent
1.1 pavel 693: .It Sy Third level name Type Changeable
694: .\" XXX Changeable? really?
695: .It kern.mbuf.mblowat integer yes
696: .It kern.mbuf.mclbytes integer yes
697: .It kern.mbuf.mcllowat integer yes
698: .It kern.mbuf.msize integer yes
699: .It kern.mbuf.nmbclusters integer yes
700: .El
701: .Pp
702: The variables are as follows:
703: .Bl -tag -width "123456"
704: .It Li kern.mbuf.mblowat ( MBUF_MBLOWAT )
705: The mbuf low water mark.
706: .It Li kern.mbuf.mclbytes ( MBUF_MCLBYTES )
707: The mbuf cluster size.
708: .It Li kern.mbuf.mcllowat ( MBUF_MCLLOWAT )
709: The mbuf cluster low water mark.
710: .It Li kern.mbuf.msize ( MBUF_MSIZE )
711: The mbuf base size.
712: .It Li kern.mbuf.nmbclusters ( MBUF_NMBCLUSTERS )
713: The limit on the number of mbuf clusters.
714: The variable can only be increased, and only increased on machines with
715: direct-mapped pool pages.
716: .El
717: .It Li kern.memlock ( KERN_MEMLOCK )
1.58 wiz 718: Returns 1 if the
719: .St -p1003.1b-93
720: Process Memory Locking Option is available on this system,
1.56 uwe 721: otherwise\ 0.
1.1 pavel 722: .It Li kern.memlock_range ( KERN_MEMLOCK_RANGE )
1.58 wiz 723: Returns 1 if the
724: .St -p1003.1b-93
725: Range Memory Locking Option is available on this system,
1.56 uwe 726: otherwise\ 0.
1.1 pavel 727: .It Li kern.memory_protection ( KERN_MEMORY_PROTECTION )
1.58 wiz 728: Returns 1 if the
729: .St -p1003.1b-93
730: Memory Protection Option is available on this system,
1.56 uwe 731: otherwise\ 0.
1.42 jruoho 732: .It Li kern.module
733: Settings related to kernel modules.
734: The third level names for the settings are described below.
735: .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent
736: .It Sy Third level name Type Changeable
737: .It kern.module.autoload integer yes
738: .It kern.module.verbose integer yes
739: .El
740: .Pp
741: The variables are as follows:
742: .Bl -tag -width "123456"
743: .It Li kern.module.autoload
744: A boolean that controls whether kernel modules are loaded automatically.
1.52 jruoho 745: See
1.53 jruoho 746: .Xr module 7
1.42 jruoho 747: for additional details.
748: .It Li kern.module.verbose
749: A boolean that enables or disables verbose
750: debug messages related to kernel modules.
751: .El
1.49 jruoho 752: .It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )
1.58 wiz 753: Returns the standard version the implementation of the
754: .St -p1003.1b-93
1.49 jruoho 755: Monotonic Clock Option conforms to,
1.56 uwe 756: otherwise\ 0.
1.48 jruoho 757: .It Li kern.mqueue
758: Settings related to
759: .Tn POSIX
760: message queues; see
761: .Xr mqueue 3 .
762: This node is created dynamically when
763: the corresponding kernel module is loaded.
764: The third level names for the settings are described below.
765: .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent
766: .It Sy Third level name Type Changeable
767: .It kern.mqueue.mq_open_max integer yes
768: .It kern.mqueue.mq_prio_max integer yes
769: .It kern.mqueue.mq_max_msgsize integer yes
770: .It kern.mqueue.mq_def_maxmsg integer yes
771: .It kern.mqueue.mq_max_maxmsg integer yes
772: .El
773: .Pp
774: The variables are:
775: .Bl -tag -width "123456"
776: .It Li kern.mqueue.mq_open_max
777: The maximum number of message queue descriptors any single process can open.
778: .It Li kern.mqueue.mq_prio_max
779: The maximum priority of a message.
780: .It Li kern.mqueue.mq_max_msgsize
781: The maximum size of a message in a message queue.
782: .It Li kern.mqueue.mq_def_maxmsg
783: The default maximum message count.
784: .It Li kern.mqueue.mq_max_maxmsg
785: The maximum number of messages in a message queue.
786: .El
1.1 pavel 787: .It Li kern.msgbuf ( KERN_MSGBUF )
788: The kernel message buffer, rotated so that the head of the circular kernel
789: message buffer is at the start of the returned data.
790: The returned data may contain NUL bytes.
791: .It Li kern.msgbufsize ( KERN_MSGBUFSIZE )
792: The maximum number of characters that the kernel message buffer can hold.
793: .It Li kern.ngroups ( KERN_NGROUPS )
794: The maximum number of supplemental groups.
1.41 jruoho 795: .\" .It Li kern.no_sa_support
796: .\" XXX: Undocumented.
1.1 pavel 797: .It Li kern.ntptime ( KERN_NTPTIME )
798: A
1.56 uwe 799: .Vt struct ntptimeval
1.1 pavel 800: structure is returned.
801: This structure contains data used by the
802: .Xr ntpd 8
803: program.
804: .It Li kern.osrelease ( KERN_OSRELEASE )
805: The system release string.
806: .It Li kern.osrevision ( KERN_OSREV )
807: The system revision string.
808: .It Li kern.ostype ( KERN_OSTYPE )
809: The system type string.
1.41 jruoho 810: .\".It Li kern.panic_now
811: .\" XXX: Undocumented.
1.1 pavel 812: .It Li kern.pipe ( KERN_PIPE )
813: Pipe settings.
814: The third level names for the integer pipe settings is detailed below.
815: The changeable column shows whether a process with appropriate
816: privilege may change the value.
1.21 joerg 817: .Bl -column "kern.pipe.maxbigpipes" "integer" "Changeable" -offset indent
1.1 pavel 818: .It Sy Third level name Type Changeable
819: .It kern.pipe.kvasiz integer yes
820: .It kern.pipe.maxbigpipes integer yes
821: .It kern.pipe.maxkvasz integer yes
822: .It kern.pipe.limitkva integer yes
823: .It kern.pipe.nbigpipes integer yes
824: .El
825: .Pp
826: The variables are as follows:
827: .Bl -tag -width "123456"
828: .It Li kern.pipe.kvasiz ( KERN_PIPE_KVASIZ )
829: Amount of kernel memory consumed by pipe buffers.
830: .It Li kern.pipe.maxbigpipes ( KERN_PIPE_MAXBIGPIPES )
1.56 uwe 831: Maximum number of
832: .Dq big
833: pipes.
1.1 pavel 834: .It Li kern.pipe.maxkvasz ( KERN_PIPE_MAXKVASZ )
835: Maximum amount of kernel memory to be used for pipes.
836: .It Li kern.pipe.limitkva ( KERN_PIPE_LIMITKVA )
837: Limit for direct transfers via page loan.
838: .It Li kern.pipe.nbigpipes ( KERN_PIPE_NBIGPIPES )
1.56 uwe 839: Number of
840: .Dq big
841: pipes.
1.1 pavel 842: .El
1.39 jruoho 843: .\" XXX: Undocumented .It Li kern.posix ( ? )
844: .\" This is a node in which the only variable is semmax.
1.1 pavel 845: .It Li kern.posix1version ( KERN_POSIX1 )
1.58 wiz 846: The version of ISO/IEC 9945
847: .Pq St -p1003.1
848: with which the system attempts to comply.
1.51 jruoho 849: .It Li kern.posix_aio
850: The version of
851: .St -p1003.1
852: and its Asynchronous I/O option to which the system attempts to conform.
1.1 pavel 853: .It Li kern.posix_barriers ( KERN_POSIX_BARRIERS )
854: The version of
855: .St -p1003.1
856: and its
857: Barriers
858: option to which the system attempts to conform,
1.56 uwe 859: otherwise\ 0.
1.1 pavel 860: .It Li kern.posix_reader_writer_locks ( KERN_POSIX_READER_WRITER_LOCKS )
861: The version of
862: .St -p1003.1
863: and its
864: Read-Write Locks
865: option to which the system attempts to conform,
1.56 uwe 866: otherwise\ 0.
1.41 jruoho 867: .\".It Li kern.posix_sched
868: .\" XXX: Undocumented.
1.1 pavel 869: .It Li kern.posix_semaphores ( KERN_POSIX_SEMAPHORES )
870: The version of
871: .St -p1003.1
872: and its
873: Semaphores
874: option to which the system attempts to conform,
1.56 uwe 875: otherwise\ 0.
1.1 pavel 876: .It Li kern.posix_spin_locks ( KERN_POSIX_SPIN_LOCKS )
877: The version of
878: .St -p1003.1
879: and its
880: Spin Locks
881: option to which the system attempts to conform,
1.56 uwe 882: otherwise\ 0.
1.1 pavel 883: .It Li kern.posix_threads ( KERN_POSIX_THREADS )
884: The version of
885: .St -p1003.1
886: and its
887: Threads
888: option to which the system attempts to conform,
1.56 uwe 889: otherwise\ 0.
1.1 pavel 890: .It Li kern.posix_timers ( KERN_POSIX_TIMERS )
891: The version of
892: .St -p1003.1
893: and its
894: Timers
895: option to which the system attempts to conform,
1.56 uwe 896: otherwise\ 0.
1.1 pavel 897: .It Li kern.proc ( KERN_PROC )
898: Return the entire process table, or a subset of it.
899: An array of
1.56 uwe 900: .Vt struct kinfo_proc
1.1 pavel 901: structures is returned,
902: whose size depends on the current number of such objects in the system.
903: The third and fourth level numeric names are as follows:
1.21 joerg 904: .Bl -column "KERN_PROC_SESSION" "Fourth level is:" -offset indent
1.1 pavel 905: .It Sy Third level name Fourth level is:
1.21 joerg 906: .It KERN_PROC_ALL None
907: .It KERN_PROC_GID A group ID
908: .It KERN_PROC_PID A process ID
909: .It KERN_PROC_PGRP A process group
910: .It KERN_PROC_RGID A real group ID
911: .It KERN_PROC_RUID A real user ID
912: .It KERN_PROC_SESSION A session ID
913: .It KERN_PROC_TTY A tty device
914: .It KERN_PROC_UID A user ID
1.1 pavel 915: .El
916: .It Li kern.proc2 ( KERN_PROC2 )
1.56 uwe 917: As for
918: .Dv KERN_PROC ,
919: but an array of
920: .Vt struct kinfo_proc2
1.1 pavel 921: structures are returned.
922: The fifth level name is the size of the
1.56 uwe 923: .Vt struct kinfo_proc2
1.1 pavel 924: and the sixth level name is the number of structures to return.
925: .It Li kern.proc_args ( KERN_PROC_ARGS )
926: Return the argv or environment strings (or the number thereof)
927: of a process.
928: Multiple strings are returned separated by NUL characters.
929: The third level name is the process ID.
930: The fourth level name is as follows:
1.21 joerg 931: .Bl -column "KERN_PROG_NARGV" "The number of environ strings" -offset indent
932: .It KERN_PROC_ARGV The argv strings
933: .It KERN_PROC_ENV The environ strings
934: .It KERN_PROC_NARGV The number of argv strings
935: .It KERN_PROC_NENV The number of environ strings
1.1 pavel 936: .El
937: .It Li kern.profiling ( KERN_PROF )
938: Return profiling information about the kernel.
939: If the kernel is not compiled for profiling,
1.56 uwe 940: attempts to retrieve any of the
941: .Dv KERN_PROF
942: values will fail with
1.1 pavel 943: .Er EOPNOTSUPP .
944: The third level names for the string and integer profiling information
945: is detailed below.
946: The changeable column shows whether a process with appropriate
947: privilege may change the value.
1.21 joerg 948: .Bl -column "kern.profiling.gmonparam" "struct gmonparam" "Changeable" -offset indent
1.1 pavel 949: .It Sy Third level name Type Changeable
950: .It kern.profiling.count u_short[\|] yes
951: .It kern.profiling.froms u_short[\|] yes
952: .It kern.profiling.gmonparam struct gmonparam no
953: .It kern.profiling.state integer yes
954: .It kern.profiling.tos struct tostruct yes
955: .El
956: .Pp
957: The variables are as follows:
958: .Bl -tag -width "123456"
959: .It Li kern.profiling.count ( GPROF_COUNT )
960: Array of statistical program counter counts.
961: .It Li kern.profiling.froms ( GPROF_FROMS )
962: Array indexed by program counter of call-from points.
963: .It Li kern.profiling.gmonparams ( GPROF_GMONPARAM )
964: Structure giving the sizes of the above arrays.
965: .It Li kern.profiling.state ( GPROF_STATE )
966: Profiling state.
1.56 uwe 967: If set to
968: .Dv GMON_PROF_ON ,
969: starts profiling.
970: If set to
971: .Dv GMON_PROF_OFF ,
972: stops profiling.
1.1 pavel 973: .It Li kern.profiling.tos ( GPROF_TOS )
974: Array of
1.56 uwe 975: .Vt struct tostruct
1.1 pavel 976: describing destination of calls and their counts.
977: .El
1.41 jruoho 978: .\" .It Li kern.pset
979: .\" XXX: Undocumented.
1.1 pavel 980: .It Li kern.rawpartition ( KERN_RAWPARTITION )
981: The raw partition of a disk (a == 0).
982: .It Li kern.root_device ( KERN_ROOT_DEVICE )
983: The name of the root device (e.g.,
984: .Dq wd0 ) .
985: .It Li kern.root_partition ( KERN_ROOT_PARTITION )
986: The root partition on the root device (a == 0).
987: .It Li kern.rtc_offset ( KERN_RTC_OFFSET )
988: Return the offset of real time clock from UTC in minutes.
989: .It Li kern.saved_ids ( KERN_SAVED_IDS )
990: Returns 1 if saved set-group and saved set-user ID is available.
991: .It Li kern.sbmax ( KERN_SBMAX )
992: Maximum socket buffer size.
993: .\" XXX units?
994: .It Li kern.securelevel ( KERN_SECURELVL )
1.25 elad 995: See
996: .Xr secmodel_securelevel 9 .
1.41 jruoho 997: .\" .It Li kern.sched
998: .\" XXX: Undocumented.
1.1 pavel 999: .It Li kern.somaxkva ( KERN_SOMAXKVA )
1000: Maximum amount of kernel memory to be used for socket buffers.
1001: .\" XXX units?
1002: .It Li kern.synchronized_io ( KERN_SYNCHRONIZED_IO )
1.58 wiz 1003: Returns 1 if the
1004: .St -p1003.1b-93
1005: Synchronized I/O Option is available on this system,
1.56 uwe 1006: otherwise\ 0.
1.19 christos 1007: .It Li kern.timecounter ( dynamic )
1008: Display and control the timecounter source of the system.
1.21 joerg 1009: .Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent
1.19 christos 1010: .It Sy Third level name Type Changeable
1011: .It kern.timecounter.choice string no
1012: .It kern.timecounter.hardware string yes
1013: .It kern.timecounter.timestepwarnings integer yes
1014: .El
1015: .Pp
1016: The variables are as follows:
1017: .Bl -tag -width "123456"
1018: .It Li kern.timecounter.choice ( dynamic )
1019: The list of available timecounters with their quality and frequency.
1020: .It Li kern.timecounter.hardware ( dynamic )
1021: The currently selected timecounter source.
1022: .It Li kern.timecounter.timestepwarnings ( dynamic )
1023: If non-zero display a message each time the time is stepped.
1024: .El
1.1 pavel 1025: .It Li kern.timex ( KERN_TIMEX )
1026: Not available.
1027: .It Li kern.tkstat ( KERN_TKSTAT )
1028: Return information about the number of characters sent and received
1029: on ttys.
1030: The third level names for the tty statistic variables are detailed below.
1031: The changeable column shows whether a process
1032: with appropriate privilege may change the value.
1.21 joerg 1033: .Bl -column "kern.tkstat.cancc" "quad" "Changeable" -offset indent
1.1 pavel 1034: .It Sy Third level name Type Changeable
1035: .It kern.tkstat.cancc quad no
1036: .It kern.tkstat.nin quad no
1037: .It kern.tkstat.nout quad no
1038: .It kern.tkstat.rawcc quad no
1039: .El
1040: .Pp
1041: The variables are as follows:
1042: .Bl -tag -width "123456"
1043: .It Li kern.tkstat.cancc ( KERN_TKSTAT_CANCC )
1044: The number of canonical input characters.
1045: .It Li kern.tkstat.nin ( KERN_TKSTAT_NIN )
1046: The total number of input characters.
1047: .It Li kern.tkstat.nout ( KERN_TKSTAT_NOUT )
1048: The total number of output characters.
1049: .It Li kern.tkstat.rawcc ( KERN_TKSTAT_RAWCC )
1050: The number of raw input characters.
1051: .El
1.66 christos 1052: .It Li kern.tty
1053: The third level names for the tty setup variables are detailed below.
1054: The changeable column shows whether a process
1055: with appropriate privilege may change the value.
1056: .Bl -column "kern.tty.qsize" "int" "Changeable" -offset indent
1057: .It Sy Third level name Type Changeable
1058: .It kern.tty.qsize int yes
1059: .El
1060: .Pp
1061: The variables are as follows:
1062: .Bl -tag -width "123456"
1063: .It Li kern.tty.qsize
1064: Control/display the size of the default input and output queues selected
1065: during tty creation.
1066: Is converted to a power of two and its range is between
1067: .Dv 1024
1068: and
1069: .Dv 65536 .
1070: .El
1.1 pavel 1071: .It Li kern.urandom ( KERN_URND )
1072: Random integer value.
1.45 jruoho 1073: .It Li kern.usercrypto
1074: When enabled, allows userland to
1075: .Xr open 2
1076: the
1077: .Pa /dev/crypto
1078: special device, used by the
1079: .Xr crypto 4
1080: system.
1081: .It Li kern.userasymcrypto
1082: Enables or disables the use of software asymmetric crypto support in the
1083: .Xr crypto 4
1084: system.
1.1 pavel 1085: .It Li kern.veriexec
1.40 jruoho 1086: Runtime information for
1087: .Xr veriexec 8 .
1088: .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent
1089: .It Sy Third level name Type Changeable
1090: .It kern.veriexec.algorithms string no
1091: .It kern.veriexec.count node not applicable
1092: .It kern.veriexec.strict integer yes
1093: .It kern.veriexec.verbose integer yes
1094: .El
1.1 pavel 1095: .Bl -tag -width "123456"
1096: .It Li kern.veriexec.algorithms
1097: Returns a string with the supported algorithms in Veriexec.
1098: .It Li kern.veriexec.count
1099: Sub-nodes are added to this node as new mounts are monitored by Veriexec.
1100: Each mount will be under its own
1101: .No tableN
1102: node.
1103: Under each node there will be three variables, indicating the mount
1.57 wiz 1104: point, the file system type, and the number of entries.
1.1 pavel 1105: .It Li kern.veriexec.strict
1106: Controls the strict level of Veriexec.
1107: See
1.62 jruoho 1108: .Xr security 7
1.1 pavel 1109: for more information on each level's implications.
1110: .It Li kern.veriexec.verbose
1111: Controls the verbosity level of Veriexec.
1112: If 0, only the minimal
1113: indication required will be given about what's happening - fingerprint
1114: mismatches, removal of entries from the tables, modification of a
1115: fingerprinted file.
1116: If 1, more messages will be printed (ie., when a file with a valid
1117: fingerprint is accessed).
1118: Verbose level 2 is debug mode.
1119: .El
1120: .It Li kern.version ( KERN_VERSION )
1121: The system version string.
1122: .It Li kern.vnode ( KERN_VNODE )
1123: Return the entire vnode table.
1124: Note, the vnode table is not necessarily a consistent snapshot of
1125: the system.
1126: The returned data consists of an array whose size depends on the
1127: current number of such objects in the system.
1128: Each element of the array contains the kernel address of a vnode
1.56 uwe 1129: .Vt struct vnode *
1.1 pavel 1130: followed by the vnode itself
1.56 uwe 1131: .Vt struct vnode .
1.43 jruoho 1132: .\" XXX: Undocumented: kern.lwp: no children?
1.1 pavel 1133: .El
1.50 jruoho 1134: .Ss The machdep.* subtree
1.1 pavel 1135: The set of variables defined is architecture dependent.
1136: Most architectures define at least the following variables.
1.43 jruoho 1137: .Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent
1.1 pavel 1138: .It Sy Second level name Type Changeable
1.43 jruoho 1139: .It Li machdep.booted_kernel string no
1.1 pavel 1140: .El
1.43 jruoho 1141: .\" XXX: Document the above.
1.50 jruoho 1142: .Ss The net.* subtree
1.1 pavel 1143: The string and integer information available for the
1144: .Li net
1145: level is detailed below.
1146: The changeable column shows whether a process with appropriate
1147: privilege may change the value.
1148: The second and third levels are typically the protocol family and
1149: protocol number, though this is not always the case.
1.21 joerg 1150: .Bl -column "Second level name" "IPsec key management values" "Changeable" -offset indent
1.1 pavel 1151: .It Sy Second level name Type Changeable
1152: .It net.route routing messages no
1153: .It net.inet IPv4 values yes
1154: .It net.inet6 IPv6 values yes
1155: .It net.key IPsec key management values yes
1156: .El
1157: .Pp
1158: .Bl -tag -width "123456"
1159: .It Li net.route ( PF_ROUTE )
1160: .\" XXX really?
1161: Return the entire routing table or a subset of it.
1162: The data is returned as a sequence of routing messages (see
1163: .Xr route 4
1164: for the header file, format and meaning).
1165: The length of each message is contained in the message header.
1166: .Pp
1.56 uwe 1167: The third level name is a protocol number, which is currently always\ 0.
1.1 pavel 1168: The fourth level name is an address family, which may be set to 0 to
1169: select all address families.
1170: The fifth and sixth level names are as follows:
1.21 joerg 1171: .Bl -column "Fifth level name" "Sixth level is:" -offset indent
1.1 pavel 1172: .It Sy Fifth level name Sixth level is:
1.21 joerg 1173: .It NET_RT_FLAGS rtflags
1174: .It NET_RT_DUMP None
1175: .It NET_RT_IFLIST None
1.1 pavel 1176: .El
1177: .It Li net.inet ( PF_INET )
1178: Get or set various global information about the IPv4
1179: .Pq Internet Protocol version 4 .
1180: The third level name is the protocol.
1181: The fourth level name is the variable name.
1182: The currently defined protocols and names are:
1.21 joerg 1183: .Bl -column "Protocol name" "sack.globalmaxholes" "integer" "Changeable" -offset 4n
1.1 pavel 1184: .It Sy Protocol name Variable name Type Changeable
1185: .It arp down integer yes
1186: .It arp keep integer yes
1.65 christos 1187: .It arp log_movements integer yes
1188: .It arp log_permanent_modify integer yes
1189: .It arp log_wrong_iface integer yes
1.1 pavel 1190: .It arp prune integer yes
1191: .It arp refresh integer yes
1192: .It carp allow integer yes
1193: .It carp preempt integer yes
1194: .It carp log integer yes
1195: .It carp arpbalance integer yes
1196: .It icmp errppslimit integer yes
1197: .It icmp maskrepl integer yes
1198: .It icmp rediraccept integer yes
1199: .It icmp redirtimeout integer yes
1.28 christos 1200: .It icmp bmcastecho integer yes
1.1 pavel 1201: .It ip allowsrcrt integer yes
1202: .It ip anonportmax integer yes
1203: .It ip anonportmin integer yes
1204: .It ip checkinterface integer yes
1205: .It ip directed-broadcast integer yes
1206: .It ip do_loopback_cksum integer yes
1207: .It ip forwarding integer yes
1208: .It ip forwsrcrt integer yes
1209: .It ip gifttl integer yes
1210: .It ip grettl integer yes
1.8 liamjfoy 1211: .It ip hashsize integer yes
1.1 pavel 1212: .It ip hostzerobroadcast integer yes
1213: .It ip lowportmin integer yes
1214: .It ip lowportmax integer yes
1215: .It ip maxflows integer yes
1216: .It ip maxfragpackets integer yes
1217: .It ip mtudisc integer yes
1218: .It ip mtudisctimeout integer yes
1219: .It ip random_id integer yes
1220: .It ip redirect integer yes
1221: .It ip subnetsarelocal integer yes
1222: .It ip ttl integer yes
1223: .It tcp rfc1323 integer yes
1224: .It tcp sendspace integer yes
1225: .It tcp recvspace integer yes
1226: .It tcp mssdflt integer yes
1227: .It tcp syn_cache_limit integer yes
1228: .It tcp syn_bucket_limit integer yes
1229: .It tcp syn_cache_interval integer yes
1230: .It tcp init_win integer yes
1231: .It tcp init_win_local integer yes
1232: .It tcp mss_ifmtu integer yes
1233: .It tcp win_scale integer yes
1234: .It tcp timestamps integer yes
1235: .It tcp compat_42 integer yes
1236: .It tcp cwm integer yes
1237: .It tcp cwm_burstsize integer yes
1238: .It tcp ack_on_push integer yes
1239: .It tcp keepidle integer yes
1240: .It tcp keepintvl integer yes
1241: .It tcp keepcnt integer yes
1242: .It tcp slowhz integer no
1.12 christos 1243: .It tcp keepinit integer yes
1.1 pavel 1244: .It tcp log_refused integer yes
1245: .It tcp rstppslimit integer yes
1246: .It tcp ident struct no
1.13 christos 1247: .It tcp drop struct no
1.1 pavel 1248: .It tcp sack.enable integer yes
1249: .It tcp sack.globalholes integer no
1250: .It tcp sack.globalmaxholes integer yes
1251: .It tcp sack.maxholes integer yes
1252: .It tcp ecn.enable integer yes
1253: .It tcp ecn.maxretries integer yes
1254: .It tcp congctl.selected string yes
1255: .It tcp congctl.available string yes
1256: .It tcp abc.enable integer yes
1257: .It tcp abc.aggressive integer yes
1258: .It udp checksum integer yes
1259: .It udp do_loopback_cksum integer yes
1260: .It udp recvspace integer yes
1.67 christos 1261: .It udp rfc6056.selected string yes
1262: .It udp rfc6056.available string yes
1.1 pavel 1263: .It udp sendspace integer yes
1264: .El
1265: .Pp
1266: The variables are as follows:
1267: .Bl -tag -width "123456"
1268: .It Li arp.down
1269: Failed ARP entry lifetime.
1270: .It Li arp.keep
1271: Valid ARP entry lifetime.
1272: .It Li arp.prune
1273: ARP cache pruning interval.
1274: .It Li arp.refresh
1275: ARP entry refresh interval.
1276: .It Li carp.allow
1277: If set to 0, incoming
1278: .Xr carp 4
1279: packets will not be processed.
1280: If set to any other value, processing will occur.
1281: Enabled by default.
1282: .It Li carp.arpbalance
1283: If set to any value other than 0, the ARP balancing functionality of
1284: .Xr carp 4
1285: is enabled.
1286: When ARP requests are received for an IP address which is part of any virtual
1287: host, carp will hash the source IP in the ARP request to select one of the
1288: virtual hosts from the set of all the virtual hosts which have that IP address.
1289: The master of that host will respond with the correct virtual MAC address.
1290: Disabled by default.
1291: .It Li carp.log
1292: If set to any value other than 0,
1293: .Xr carp 4
1294: will log errors.
1295: Disabled by default.
1296: .It Li carp.preempt
1297: If set to 0,
1298: .Xr carp 4
1299: will not attempt to become master if it is receiving advertisements from
1300: another active master.
1301: If set to any other value, carp will become master of the virtual host if it
1302: believes it can send advertisements more frequently than the current master.
1303: Disabled by default.
1304: .It Li ip.allowsrcrt
1305: If set to 1, the host accepts source routed packets.
1306: .It Li ip.anonportmax
1307: The highest port number to use for TCP and UDP ephemeral port allocation.
1308: This cannot be set to less than 1024 or greater than 65535, and must
1309: be greater than
1310: .Li ip.anonportmin .
1311: .It Li ip.anonportmin
1312: The lowest port number to use for TCP and UDP ephemeral port allocation.
1313: This cannot be set to less than 1024 or greater than 65535.
1314: .It Li ip.checkinterface
1315: If set to non-zero, the host will reject packets addressed to it
1316: that arrive on an interface not bound to that address.
1317: Currently, this must be disabled if ipnat is used to translate the
1318: destination address to another local interface, or if addresses
1319: are added to the loopback interface instead of the interface where
1320: the packets for those packets are received.
1321: .It Li ip.directed-broadcast
1322: If set to 1, enables directed broadcast behavior for the host.
1323: .It Li ip.do_loopback_cksum
1324: Perform IP checksum on loopback.
1325: .It Li ip.forwarding
1326: If set to 1, enables IP forwarding for the host,
1327: meaning that the host is acting as a router.
1328: .It Li ip.forwsrcrt
1329: If set to 1, enables forwarding of source-routed packets for the host.
1330: This value may only be changed if the kernel security level is less than 1.
1331: .It Li ip.gifttl
1332: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1333: .Xr gif 4
1334: tunnel interface.
1335: .It Li ip.grettl
1336: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1337: .Xr gre 4
1338: tunnel interface.
1.8 liamjfoy 1339: .It Li ip.hashsize
1340: The size of IPv4 Fast Forward hash table.
1341: This value must be a power of 2 (64, 256...).
1342: A larger hash table size results in fewer collisions.
1343: Also see
1344: .Li ip.maxflows .
1.1 pavel 1345: .It Li ip.hostzerobroadcast
1346: All zeroes address is broadcast address.
1347: .It Li ip.lowportmax
1348: The highest port number to use for TCP and UDP reserved port allocation.
1349: This cannot be set to less than 0 or greater than 1024, and must
1350: be greater than
1351: .Li ip.lowportmin .
1352: .It Li ip.lowportmin
1353: The lowest port number to use for TCP and UDP reserved port allocation.
1354: This cannot be set to less than 0 or greater than 1024, and must
1355: be smaller than
1356: .Li ip.lowportmax .
1357: .It Li ip.maxflows
1.5 liamjfoy 1358: IPv4 Fast Forwarding is enabled by default.
1359: If set to 0, IPv4 Fast Forwarding is disabled.
1.1 pavel 1360: .Li ip.maxflows
1361: controls the maximum amount of flows which can be created.
1362: The default value is 256.
1363: .It Li ip.maxfragpackets
1364: The maximum number of fragmented packets the node will accept.
1365: 0 means that the node will not accept any fragmented packets.
1366: \-1 means that the node will accept as many fragmented packets as it receives.
1367: The flag is provided basically for avoiding possible DoS attacks.
1368: .It Li ip.mtudisc
1369: If set to 1, enables Path MTU Discovery (RFC 1191).
1370: When Path MTU Discovery is enabled, the transmitted TCP segment
1371: size will be determined by the advertised maximum segment size
1372: (MSS) from the remote end, as constrained by the path MTU.
1373: If MTU Discovery is disabled, the transmitted segment size will
1374: never be greater than
1375: .Li tcp.mssdflt
1376: (the local maximum segment size).
1377: .It Li ip.mtudisctimeout
1378: The number of seconds in which a route added by the Path MTU
1379: Discovery engine will time out.
1380: When the route times out, the Path
1381: MTU Discovery engine will attempt to probe a larger path MTU.
1382: .It Li ip.random_id
1383: Assign random ip_id values.
1384: .It Li ip.redirect
1385: If set to 1, ICMP redirects may be sent by the host.
1386: This option is ignored unless the host is routing IP packets,
1387: and should normally be enabled on all systems.
1388: .It Li ip.subnetsarelocal
1389: If set to 1, subnets are to be considered local addresses.
1390: .It Li ip.ttl
1391: The maximum time-to-live (hop count) value for an IP packet sourced by
1392: the system.
1393: This value applies to normal transport protocols, not to ICMP.
1394: .It Li icmp.errppslimit
1395: The variable specifies the maximum number of outgoing ICMP error messages,
1396: per second.
1397: ICMP error messages that exceeded the value are subject to rate limitation
1398: and will not go out from the node.
1399: Negative value disables rate limitation.
1400: .It Li icmp.maskrepl
1401: If set to 1, ICMP network mask requests are to be answered.
1402: .It Li icmp.rediraccept
1403: If set to non-zero, the host will accept ICMP redirect packets.
1404: Note that routers will never accept ICMP redirect packets,
1405: and the variable is meaningful on IP hosts only.
1406: .It Li icmp.redirtimeout
1407: The variable specifies lifetime of routing entries generated by incoming
1408: ICMP redirect.
1409: This defaults to 600 seconds.
1410: .It Li icmp.returndatabytes
1411: Number of bytes to return in an ICMP error message.
1.28 christos 1412: .It Li icmp.bmcastecho
1413: If set to 1, enables responding to ICMP echo or timestamp request to the
1414: broadcast address.
1.1 pavel 1415: .It Li tcp.ack_on_push
1416: If set to 1, TCP is to immediately transmit an ACK upon reception of
1417: a packet with PUSH set.
1418: This can avoid losing a round trip time in some rare situations,
1419: but has the caveat of potentially defeating TCP's delayed ACK algorithm.
1420: Use of this option is generally not recommended, but
1421: the variable exists in case your configuration really needs it.
1422: .It Li tcp.compat_42
1423: If set to 1, enables work-arounds for bugs in the 4.2BSD TCP implementation.
1424: Use of this option is not recommended, although it may be
1425: required in order to communicate with extremely old TCP implementations.
1426: .It Li tcp.cwm
1427: If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window
1428: Monitoring algorithm.
1429: This algorithm prevents line-rate bursts of packets that could
1430: otherwise occur when data begins flowing on an idle TCP connection.
1431: These line-rate bursts can contribute to network and router congestion.
1432: This can be particularly useful on World Wide Web servers
1433: which support HTTP/1.1, which has lingering connections.
1434: .It Li tcp.cwm_burstsize
1435: The Congestion Window Monitoring allowed burst size, in terms
1436: of packet count.
1437: .It Li tcp.delack_ticks
1438: Number of ticks to delay sending an ACK.
1439: .It Li tcp.do_loopback_cksum
1440: Perform TCP checksum on loopback.
1441: .It Li tcp.init_win
1442: A value indicating the TCP initial congestion window.
1443: If this value is 0, an auto-tuning algorithm designed to use an initial
1444: window of approximately 4K bytes is in use.
1445: Otherwise, this value indicates a fixed number of packets.
1446: .It Li tcp.init_win_local
1447: Like
1448: .Li tcp.init_win ,
1449: but used when communicating with hosts on a local network.
1450: .It Li tcp.keepcnt
1451: Number of keepalive probes sent before declaring a connection dead.
1452: If set to zero, there is no limit;
1453: keepalives will be sent until some kind of
1454: response is received from the peer.
1455: .It Li tcp.keepidle
1456: Time a connection must be idle before keepalives are sent (if keepalives
1457: are enabled for the connection).
1458: See also tcp.slowhz.
1459: .It Li tcp.keepintvl
1460: Time after a keepalive probe is sent until, in the absence of any response,
1461: another probe is sent.
1462: See also tcp.slowhz.
1463: .It Li tcp.log_refused
1464: If set to 1, refused TCP connections to the host will be logged.
1.12 christos 1465: .It Li tcp.keepinit
1466: Timeout in seconds during connection establishment.
1.1 pavel 1467: .It Li tcp.mss_ifmtu
1468: If set to 1, TCP calculates the outgoing maximum segment size based on
1469: the MTU of the appropriate interface.
1470: If set to 0, it is calculated based on the greater of the MTU of the
1471: interface, and the largest (non-loopback) interface MTU on the system.
1472: .It Li tcp.mssdflt
1473: The default maximum segment size both advertised to the peer
1474: and to use when either the peer does not advertise a maximum segment size to
1475: us during connection setup or Path MTU Discovery
1476: .Li ( ip.mtudisc )
1477: is disabled.
1478: Do not change this value unless you really know what you are doing.
1479: .It Li tcp.recvspace
1480: The default TCP receive buffer size.
1481: .It Li tcp.rfc1323
1482: If set to 1, enables RFC 1323 extensions to TCP.
1483: .It Li tcp.rstppslimit
1484: The variable specifies the maximum number of outgoing TCP RST packets,
1485: per second.
1486: TCP RST packet that exceeded the value are subject to rate limitation
1487: and will not go out from the node.
1488: Negative value disables rate limitation.
1.13 christos 1489: .It Li tcp.ident
1490: Return the user ID of a connected socket pair.
1491: (RFC1413 Identification Protocol lookups.)
1492: .It Li tcp.drop
1493: Drop a TCP socket pair connection.
1.1 pavel 1494: .It Li tcp.sack.enable
1495: If set to 1, enables RFC 2018 Selective ACKnowledgement.
1496: .It Li tcp.sack.globalholes
1497: Global number of TCP SACK holes.
1498: .It Li tcp.sack.globalmaxholes
1499: Global maximum number of TCP SACK holes.
1500: .It Li tcp.sack.maxholes
1501: Maximum number of TCP SACK holes allowed per connection.
1502: .It Li tcp.ecn.enable
1503: If set to 1, enables RFC 3168 Explicit Congestion Notification.
1504: .It Li tcp.ecn.maxretries
1505: Number of times to retry sending the ECN-setup packet.
1506: .It Li tcp.sendspace
1507: The default TCP send buffer size.
1508: .It Li tcp.slowhz
1509: The units for tcp.keepidle and tcp.keepintvl; those variables are in ticks
1510: of a clock that ticks tcp.slowhz times per second.
1511: (That is, their values
1512: must be divided by the tcp.slowhz value to get times in seconds.)
1513: .It Li tcp.syn_bucket_limit
1514: The maximum number of entries allowed per hash bucket in the TCP
1515: compressed state engine.
1516: .It Li tcp.syn_cache_limit
1517: The maximum number of entries allowed in the TCP compressed state
1518: engine.
1519: .It Li tcp.timestamps
1520: If rfc1323 is enabled, a value of 1 indicates RFC 1323 time stamp options,
1521: used for measuring TCP round trip times, are enabled.
1522: .It Li tcp.win_scale
1523: If rfc1323 is enabled, a value of 1 indicates RFC 1323 window scale options,
1524: for increasing the TCP window size, are enabled.
1525: .It Li tcp.congctl.available
1526: The available TCP congestion control algorithms.
1527: .It Li tcp.congctl.selected
1528: The currently selected TCP congestion control algorithm.
1529: .It Li tcp.abc.enable
1530: If set to 1, use RFC 3465 Appropriate Byte Counting (ABC).
1531: If set to 0, use traditional Packet Counting.
1532: .It Li tcp.abc.aggressive
1533: Choose the L parameter found in RFC 3465.
1534: L is the maximum cwnd increase for an ack during slow start.
1535: If set to 1, use L=2*SMSS.
1536: If set to 0, use L=1*SMSS.
1537: It has no effect unless tcp.abc.enable is set to 1.
1538: .It Li udp.checksum
1539: If set to 1, UDP checksums are being computed.
1540: Received non-zero UDP checksums are always checked.
1541: Disabling UDP checksums is strongly discouraged.
1.67 christos 1542: .It Li udp.recvspace
1543: The default UDP receive buffer size.
1544: .It Li udp.rfc6056.available
1545: The available RFC 6056 port randomization algorithms.
1546: .It Li udp.rfc6056.selected
1547: The currently selected RFC 6056 port randomization algorithm.
1.1 pavel 1548: .It Li udp.sendspace
1549: The default UDP send buffer size.
1550: .El
1551: .Pp
1552: For variables net.*.ipsec, please refer to
1553: .Xr ipsec 4 .
1554: .It Li net.inet6 ( PF_INET6 )
1555: Get or set various global information about the IPv6
1556: .Pq Internet Protocol version 6 .
1557: The third level name is the protocol.
1558: The fourth level name is the variable name.
1559: The currently defined protocols and names are:
1.21 joerg 1560: .Bl -column "Protocol name" "do_loopback_cksum" "integer" "Changeable" -offset indent
1.1 pavel 1561: .It Sy Protocol name Variable name Type Changeable
1562: .It icmp6 errppslimit integer yes
1563: .It icmp6 mtudisc_hiwat integer yes
1564: .It icmp6 mtudisc_lowat integer yes
1565: .It icmp6 nd6_debug integer yes
1566: .It icmp6 nd6_delay integer yes
1567: .It icmp6 nd6_maxnudhint integer yes
1568: .It icmp6 nd6_mmaxtries integer yes
1569: .It icmp6 nd6_prune integer yes
1570: .It icmp6 nd6_umaxtries integer yes
1571: .It icmp6 nd6_useloopback integer yes
1572: .It icmp6 nodeinfo integer yes
1573: .It icmp6 rediraccept integer yes
1574: .It icmp6 redirtimeout integer yes
1575: .It ip6 accept_rtadv integer yes
1576: .It ip6 anonportmax integer yes
1577: .It ip6 anonportmin integer yes
1578: .It ip6 auto_flowlabel integer yes
1579: .It ip6 dad_count integer yes
1580: .It ip6 defmcasthlim integer yes
1581: .It ip6 forwarding integer yes
1582: .It ip6 gifhlim integer yes
1.7 liamjfoy 1583: .It ip6 hashsize integer yes
1.1 pavel 1584: .It ip6 hlim integer yes
1585: .It ip6 hdrnestlimit integer yes
1586: .It ip6 kame_version string no
1587: .It ip6 keepfaith integer yes
1588: .It ip6 log_interval integer yes
1589: .It ip6 lowportmax integer yes
1590: .It ip6 lowportmin integer yes
1.5 liamjfoy 1591: .It ip6 maxflows integer yes
1.1 pavel 1592: .It ip6 maxfragpackets integer yes
1593: .It ip6 maxfrags integer yes
1594: .It ip6 redirect integer yes
1595: .It ip6 rr_prune integer yes
1596: .It ip6 use_deprecated integer yes
1597: .It ip6 v6only integer yes
1598: .It udp6 do_loopback_cksum integer yes
1599: .It udp6 recvspace integer yes
1.67 christos 1600: .It udp6 rfc6056.selected string yes
1601: .It udp6 rfc6056.available string yes
1.1 pavel 1602: .It udp6 sendspace integer yes
1603: .El
1604: .Pp
1605: The variables are as follows:
1606: .Bl -tag -width "123456"
1607: .It Li ip6.accept_rtadv
1608: If set to non-zero, the node will accept ICMPv6 router advertisement packets
1609: and autoconfigures address prefixes and default routers.
1610: The node must be a host
1611: .Pq not a router
1612: for the option to be meaningful.
1613: .It Li ip6.anonportmax
1614: The highest port number to use for TCP and UDP ephemeral port allocation.
1615: This cannot be set to less than 1024 or greater than 65535, and must
1616: be greater than
1617: .Li ip6.anonportmin .
1618: .It Li ip6.anonportmin
1619: The lowest port number to use for TCP and UDP ephemeral port allocation.
1620: This cannot be set to less than 1024 or greater than 65535.
1621: .It Li ip6.auto_flowlabel
1622: On connected transport protocol packets,
1623: fill IPv6 flowlabel field to help intermediate routers to identify packet flows.
1624: .It Li ip6.dad_count
1625: The variable configures number of IPv6 DAD
1626: .Pq duplicated address detection
1627: probe packets.
1628: The packets will be generated when IPv6 interface addresses are configured.
1629: .It Li ip6.defmcasthlim
1630: The default hop limit value for an IPv6 multicast packet sourced by the node.
1631: This value applies to all the transport protocols on top of IPv6.
1632: There are APIs to override the value, as documented in
1633: .Xr ip6 4 .
1634: .It Li ip6.forwarding
1635: If set to 1, enables IPv6 forwarding for the node,
1636: meaning that the node is acting as a router.
1637: If set to 0, disables IPv6 forwarding for the node,
1638: meaning that the node is acting as a host.
1639: IPv6 specification defines node behavior for
1640: .Dq router
1641: case and
1642: .Dq host
1643: case quite differently, and changing this variable during operation
1644: may cause serious trouble.
1645: It is recommended to configure the variable at bootstrap time,
1646: and bootstrap time only.
1647: .It Li ip6.gifhlim
1648: The maximum hop limit value for an IPv6 packet generated by
1649: .Xr gif 4
1650: tunnel interface.
1651: .It Li ip6.hdrnestlimit
1652: The number of IPv6 extension headers permitted on incoming IPv6 packets.
1653: If set to 0, the node will accept as many extension headers as possible.
1.7 liamjfoy 1654: .It Li ip6.hashsize
1655: The size of IPv6 Fast Forward hash table.
1.56 uwe 1656: This value must be a power of 2 (64, 256, ...).
1.7 liamjfoy 1657: A larger hash table size results in fewer collisions.
1658: Also see
1659: .Li ip6.maxflows .
1.1 pavel 1660: .It Li ip6.hlim
1661: The default hop limit value for an IPv6 unicast packet sourced by the node.
1662: This value applies to all the transport protocols on top of IPv6.
1663: There are APIs to override the value, as documented in
1664: .Xr ip6 4 .
1665: .It Li ip6.kame_version
1666: The string identifies the version of KAME IPv6 stack implemented in the kernel.
1667: .It Li ip6.keepfaith
1668: If set to non-zero, it enables
1669: .Dq FAITH
1670: TCP relay IPv6-to-IPv4 translator code in the kernel.
1671: Refer
1672: .Xr faith 4
1673: and
1674: .Xr faithd 8
1675: for detail.
1676: .It Li ip6.log_interval
1677: The variable controls amount of logs generated by IPv6 packet
1678: forwarding engine, by setting interval between log output
1679: .Pq in seconds .
1680: .It Li ip6.lowportmax
1681: The highest port number to use for TCP and UDP reserved port allocation.
1682: This cannot be set to less than 0 or greater than 1024, and must
1683: be greater than
1684: .Li ip6.lowportmin .
1685: .It Li ip6.lowportmin
1686: The lowest port number to use for TCP and UDP reserved port allocation.
1687: This cannot be set to less than 0 or greater than 1024, and must
1688: be smaller than
1689: .Li ip6.lowportmax .
1.5 liamjfoy 1690: .It Li ip6.maxflows
1691: IPv6 Fast Forwarding is enabled by default.
1692: If set to 0, IPv6 Fast Forwarding is disabled.
1693: .Li ip6.maxflows
1694: controls the maximum amount of flows which can be created.
1.6 liamjfoy 1695: The default value is 256.
1.1 pavel 1696: .It Li ip6.maxfragpackets
1697: The maximum number of fragmented packets the node will accept.
1698: 0 means that the node will not accept any fragmented packets.
1699: \-1 means that the node will accept as many fragmented packets as it receives.
1700: The flag is provided basically for avoiding possible DoS attacks.
1701: .It Li ip6.maxfrags
1702: The maximum number of fragments the node will accept.
1703: 0 means that the node will not accept any fragments.
1704: \-1 means that the node will accept as many fragments as it receives.
1705: The flag is provided basically for avoiding possible DoS attacks.
1706: .It Li ip6.redirect
1707: If set to 1, ICMPv6 redirects may be sent by the node.
1708: This option is ignored unless the node is routing IP packets,
1709: and should normally be enabled on all systems.
1710: .It Li ip6.rr_prune
1711: The variable specifies interval between IPv6 router renumbering prefix
1712: babysitting, in seconds.
1713: .It Li ip6.use_deprecated
1714: The variable controls use of deprecated address, specified in RFC 2462 5.5.4.
1715: .It Li ip6.v6only
1716: The variable specifies initial value for
1717: .Dv IPV6_V6ONLY
1718: socket option for
1719: .Dv AF_INET6
1720: socket.
1721: Please refer to
1722: .Xr ip6 4
1723: for detail.
1724: .It Li icmp6.errppslimit
1725: The variable specifies the maximum number of outgoing ICMPv6 error messages,
1726: per second.
1727: ICMPv6 error messages that exceeded the value are subject to rate limitation
1728: and will not go out from the node.
1729: Negative value disables rate limitation.
1730: .It Li icmp6.mtudisc_hiwat
1731: .It Li icmp6.mtudisc_lowat
1732: The variables define the maximum number of routing table entries,
1733: created due to path MTU discovery
1734: .Pq prevents denial-of-service attacks with ICMPv6 too big messages .
1735: When IPv6 path MTU discovery happens, we keep path MTU information into
1736: the routing table.
1737: If the number of routing table entries exceed the value,
1738: the kernel will not attempt to keep the path MTU information.
1739: .Li icmp6.mtudisc_hiwat
1740: is used when we have verified ICMPv6 too big messages.
1741: .Li icmp6.mtudisc_lowat
1742: is used when we have unverified ICMPv6 too big messages.
1743: Verification is performed by using address/port pairs kept in connected pcbs.
1744: Negative value disables the upper limit.
1745: .It Li icmp6.nd6_debug
1746: If set to non-zero, kernel IPv6 neighbor discovery code will generate
1747: debugging messages.
1748: The debug outputs are useful to diagnose IPv6 interoperability issues.
1749: The flag must be set to 0 for normal operation.
1750: .It Li icmp6.nd6_delay
1751: The variable specifies
1752: .Dv DELAY_FIRST_PROBE_TIME
1753: timing constant in IPv6 neighbor discovery specification
1754: .Pq RFC 2461 ,
1755: in seconds.
1756: .It Li icmp6.nd6_maxnudhint
1757: IPv6 neighbor discovery permits upper layer protocols to supply reachability
1758: hints, to avoid unnecessary neighbor discovery exchanges.
1759: The variable defines the number of consecutive hints the neighbor discovery
1760: layer will take.
1761: For example, by setting the variable to 3, neighbor discovery layer
1762: will take 3 consecutive hints in maximum.
1763: After receiving 3 hints, neighbor discovery layer will perform
1764: normal neighbor discovery process.
1765: .It Li icmp6.nd6_mmaxtries
1766: The variable specifies
1767: .Dv MAX_MULTICAST_SOLICIT
1768: constant in IPv6 neighbor discovery specification
1769: .Pq RFC 2461 .
1770: .It Li icmp6.nd6_prune
1771: The variable specifies interval between IPv6 neighbor cache babysitting,
1772: in seconds.
1773: .It Li icmp6.nd6_umaxtries
1774: The variable specifies
1775: .Dv MAX_UNICAST_SOLICIT
1776: constant in IPv6 neighbor discovery specification
1777: .Pq RFC 2461 .
1778: .It Li icmp6.nd6_useloopback
1779: If set to non-zero, kernel IPv6 stack will use loopback interface for
1780: local traffic.
1781: .It Li icmp6.nodeinfo
1782: The variable enables responses to ICMPv6 node information queries.
1783: If you set the variable to 0, responses will not be generated for
1784: ICMPv6 node information queries.
1785: Since node information queries can have a security impact, it is
1786: possible to fine tune which responses should be answered.
1787: Two separate bits can be set.
1788: .Bl -tag -width "12345"
1789: .It 1
1790: Respond to ICMPv6 FQDN queries, e.g.
1791: .Li ping6 -w .
1792: .It 2
1793: Respond to ICMPv6 node addresses queries, e.g.
1794: .Li ping6 -a .
1795: .El
1796: .It Li icmp6.rediraccept
1797: If set to non-zero, the host will accept ICMPv6 redirect packets.
1798: Note that IPv6 routers will never accept ICMPv6 redirect packets,
1799: and the variable is meaningful on IPv6 hosts
1800: .Pq non-router
1801: only.
1802: .It Li icmp6.redirtimeout
1803: The variable specifies lifetime of routing entries generated by incoming
1804: ICMPv6 redirect.
1805: .It Li udp6.do_loopback_cksum
1806: Perform UDP checksum on loopback.
1807: .It Li udp6.recvspace
1808: Default UDP receive buffer size.
1.67 christos 1809: .It Li udp6.rfc6056.available
1810: The available RFC 6056 port randomization algorithms for IPv6.
1811: .It Li udp6.rfc6056.selected
1812: The currently selected RFC 6056 port randomization algorithm for IPv6.
1.1 pavel 1813: .It Li udp6.sendspace
1814: Default UDP send buffer size.
1815: .El
1816: .Pp
1817: We reuse net.*.tcp for
1818: .Tn TCP
1819: over
1820: .Tn IPv6 ,
1821: and therefore we do not have variables net.*.tcp6.
1822: Variables net.inet6.udp6 have identical meaning to net.inet.udp.
1823: Please refer to
1824: .Li PF_INET
1825: section above.
1826: For variables net.*.ipsec6, please refer to
1827: .Xr ipsec 4 .
1828: .It Li net.key ( PF_KEY )
1829: Get or set various global information about the IPsec key management.
1830: The third level name is the variable name.
1831: The currently defined variable and names are:
1.21 joerg 1832: .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
1.1 pavel 1833: .It Sy Variable name Type Changeable
1834: .It debug integer yes
1835: .It spi_try integer yes
1836: .It spi_min_value integer yes
1837: .It spi_max_value integer yes
1838: .It larval_lifetime integer yes
1839: .It blockacq_count integer yes
1840: .It blockacq_lifetime integer yes
1841: .It esp_keymin integer yes
1842: .It esp_auth integer yes
1843: .It ah_keymin integer yes
1844: .El
1.21 joerg 1845: .Pp
1.1 pavel 1846: The variables are as follows:
1847: .Bl -tag -width "123456"
1848: .It Li debug
1849: Turn on debugging message from within the kernel.
1850: The value is a bitmap, as defined in
1.56 uwe 1851: .In netkey/key_debug.h .
1.1 pavel 1852: .It Li spi_try
1853: The number of times the kernel will try to obtain an unique SPI
1854: when it generates it from random number generator.
1855: .It Li spi_min_value
1856: Minimum SPI value when generating it within the kernel.
1857: .It Li spi_max_value
1858: Maximum SPI value when generating it within the kernel.
1859: .It Li larval_lifetime
1860: Lifetime for LARVAL SAD entries, in seconds.
1861: .It Li blockacq_count
1862: Number of ACQUIRE PF_KEY messages to be blocked after an ACQUIRE message.
1863: It avoids flood of ACQUIRE PF_KEY from being sent from the kernel to the
1864: key management daemon.
1865: .It Li blockacq_lifetime
1866: Lifetime of ACQUIRE PF_KEY message.
1867: .It Li esp_keymin
1868: Minimum ESP key length, in bits.
1869: The value is used when the kernel creates proposal payload
1870: on ACQUIRE PF_KEY message.
1871: .It Li esp_auth
1872: Whether ESP authentication should be used or not.
1873: Non-zero value indicates that ESP authentication should be used.
1874: The value is used when the kernel creates proposal payload
1875: on ACQUIRE PF_KEY message.
1876: .It Li ah_keymin
1877: Minimum AH key length, in bits,
1878: The value is used when the kernel creates proposal payload
1879: on ACQUIRE PF_KEY message.
1880: .El
1881: .El
1.50 jruoho 1882: .Ss The proc.* subtree
1.1 pavel 1883: The string and integer information available for the
1884: .Li proc
1885: level is detailed below.
1886: The changeable column shows whether a process with appropriate
1887: privilege may change the value.
1888: These values are per-process,
1889: and as such may change from one process to another.
1890: When a process is created,
1891: the default values are inherited from its parent.
1892: When a set-user-ID or set-group-ID binary is executed, the
1893: value of PROC_PID_CORENAME is reset to the system default value.
1894: The second level name is either the magic value PROC_CURPROC, which
1895: points to the current process, or the PID of the target process.
1.21 joerg 1896: .Bl -column "proc.pid.corename" "string" "not applicable" -offset indent
1.1 pavel 1897: .It Sy Third level name Type Changeable
1898: .It proc.pid.corename string yes
1899: .It proc.pid.rlimit node not applicable
1900: .It proc.pid.stopfork int yes
1901: .It proc.pid.stopexec int yes
1902: .It proc.pid.stopexit int yes
1903: .El
1904: .Bl -tag -width "123456"
1905: .It Li proc.pid.corename ( PROC_PID_CORENAME )
1906: The template used for the core dump file name (see
1907: .Xr core 5
1908: for details).
1909: The base name must either be
1.56 uwe 1910: .Pa core
1911: or end with the suffix
1912: .Pa .core
1913: (the super-user may set arbitrary names).
1914: By default it points to
1915: .Dv KERN_DEFCORENAME .
1.1 pavel 1916: .It Li proc.pid.rlimit ( PROC_PID_LIMIT )
1917: Return resources limits, as defined for the
1918: .Xr getrlimit 2
1919: and
1920: .Xr setrlimit 2
1921: system calls.
1922: The fourth level name is one of:
1.56 uwe 1923: .Bl -tag -width "123456"
1.1 pavel 1924: .It Li proc.pid.rlimit.cputime ( PROC_PID_LIMIT_CPU )
1925: The maximum amount of CPU time (in seconds) to be used by each process.
1926: .It Li proc.pid.rlimit.filesize ( PROC_PID_LIMIT_FSIZE )
1927: The largest size (in bytes) file that may be created.
1928: .It Li proc.pid.rlimit.datasize ( PROC_PID_LIMIT_DATA )
1929: The maximum size (in bytes) of the data segment for a process;
1930: this defines how far a program may extend its break with the
1931: .Xr sbrk 2
1932: system call.
1933: .It Li proc.pid.rlimit.stacksize ( PROC_PID_LIMIT_STACK )
1934: The maximum size (in bytes) of the stack segment for a process;
1935: this defines how far a program's stack segment may be extended.
1936: Stack extension is performed automatically by the system.
1937: .It Li proc.pid.rlimit.coredumpsize ( PROC_PID_LIMIT_CORE )
1938: The largest size (in bytes)
1939: .Pa core
1940: file that may be created.
1941: .It Li proc.pid.rlimit.memoryuse ( PROC_PID_LIMIT_RSS )
1942: The maximum size (in bytes) to which a process's resident set size may
1943: grow.
1944: This imposes a limit on the amount of physical memory to be given to
1945: a process; if memory is tight, the system will prefer to take memory
1946: from processes that are exceeding their declared resident set size.
1947: .It Li proc.pid.rlimit.memorylocked ( PROC_PID_LIMIT_MEMLOCK )
1948: The maximum size (in bytes) which a process may lock into memory
1949: using the
1950: .Xr mlock 2
1951: function.
1952: .It Li proc.pid.rlimit.maxproc ( PROC_PID_LIMIT_NPROC )
1953: The maximum number of simultaneous processes for this user id.
1954: .It Li proc.pid.rlimit.descriptors ( PROC_PID_LIMIT_NOFILE )
1955: The maximum number of open files for this process.
1.22 snj 1956: .It Li proc.pid.rlimit.sbsize ( PROC_PID_LIMIT_SBSIZE )
1957: The maximum size (in bytes) of the socket buffers
1958: set by the
1959: .Xr setsockopt 2
1960: .Dv SO_RCVBUF
1961: and
1962: .Dv SO_SNDBUF
1963: options.
1.1 pavel 1964: .El
1965: .Pp
1966: The fifth level name is one of
1.56 uwe 1967: .Li soft ( PROC_PID_LIMIT_TYPE_SOFT )
1968: or
1.1 pavel 1969: .Li hard ( PROC_PID_LIMIT_TYPE_HARD ) ,
1970: to select respectively the soft or hard limit.
1971: Both are of type integer.
1972: .It Li proc.pid.stopfork ( PROC_PID_STOPFORK )
1973: If non zero, the process' children will be stopped after
1974: .Xr fork 2
1975: calls.
1976: The children is created in the SSTOP state and is never scheduled
1977: for running before being stopped.
1978: This feature helps attaching a process with a debugger such as
1979: .Xr gdb 1
1980: before it had the opportunity to actually do anything.
1981: .Pp
1982: This value is inherited by the process's children, and it also
1983: apply to emulation specific system calls that fork a new process, such as
1984: .Fn sproc
1985: or
1986: .Fn clone .
1987: .It Li proc.pid.stopexec ( PROC_PID_STOPEXEC )
1988: If non zero, the process will be stopped on next
1989: .Xr exec 3
1990: call.
1991: The process created by
1992: .Xr exec 3
1993: is created in the SSTOP state and is never scheduled for running
1994: before being stopped.
1995: This feature helps attaching a process with a debugger such as
1996: .Xr gdb 1
1997: before it had the opportunity to actually do anything.
1998: .Pp
1999: This value is inherited by the process's children.
2000: .It Li proc.pid.stopexit ( PROC_PID_STOPEXIT )
2001: If non zero, the process will be stopped on when it has cause to exit,
2002: either by way of calling
2003: .Xr exit 3 ,
2004: .Xr _exit 2 ,
2005: or by the receipt of a specific signal.
2006: The process is stopped before any of its resources or vm space is
2007: released allowing examination of the termination state of a process
2008: before it disappears.
2009: This feature can be used to examine the final conditions of the
2010: process's vmspace via
2011: .Xr pmap 1
2012: or its resource settings with
2013: .Xr sysctl 8
2014: before it disappears.
2015: .Pp
2016: This value is also inherited by the process's children.
2017: .El
1.50 jruoho 2018: .Ss The user.* subtree ( CTL_USER )
1.1 pavel 2019: The string and integer information available for the
2020: .Li user
2021: level is detailed below.
2022: The changeable column shows whether a process with appropriate
2023: privilege may change the value.
1.21 joerg 2024: .Bl -column "user.coll_weights_max" "integer" "Changeable" -offset indent
1.1 pavel 2025: .It Sy Second level name Type Changeable
2026: .It user.atexit_max integer no
2027: .It user.bc_base_max integer no
2028: .It user.bc_dim_max integer no
2029: .It user.bc_scale_max integer no
2030: .It user.bc_string_max integer no
2031: .It user.coll_weights_max integer no
2032: .It user.cs_path string no
2033: .It user.expr_nest_max integer no
2034: .It user.line_max integer no
2035: .It user.posix2_c_bind integer no
2036: .It user.posix2_c_dev integer no
2037: .It user.posix2_char_term integer no
2038: .It user.posix2_fort_dev integer no
2039: .It user.posix2_fort_run integer no
2040: .It user.posix2_localedef integer no
2041: .It user.posix2_sw_dev integer no
2042: .It user.posix2_upe integer no
2043: .It user.posix2_version integer no
2044: .It user.re_dup_max integer no
2045: .It user.stream_max integer no
2046: .It user.stream_max integer no
2047: .It user.tzname_max integer no
2048: .El
2049: .Bl -tag -width "123456"
2050: .It Li user.atexit_max ( USER_ATEXIT_MAX )
2051: The maximum number of functions that may be registered with
2052: .Xr atexit 3 .
2053: .It Li user.bc_base_max ( USER_BC_BASE_MAX )
2054: The maximum ibase/obase values in the
2055: .Xr bc 1
2056: utility.
2057: .It Li user.bc_dim_max ( USER_BC_DIM_MAX )
2058: The maximum array size in the
2059: .Xr bc 1
2060: utility.
2061: .It Li user.bc_scale_max ( USER_BC_SCALE_MAX )
2062: The maximum scale value in the
2063: .Xr bc 1
2064: utility.
2065: .It Li user.bc_string_max ( USER_BC_STRING_MAX )
2066: The maximum string length in the
2067: .Xr bc 1
2068: utility.
2069: .It Li user.coll_weights_max ( USER_COLL_WEIGHTS_MAX )
2070: The maximum number of weights that can be assigned to any entry of
2071: the LC_COLLATE order keyword in the locale definition file.
2072: .It Li user.cs_path ( USER_CS_PATH )
2073: Return a value for the
2074: .Ev PATH
2075: environment variable that finds all the standard utilities.
2076: .It Li user.expr_nest_max ( USER_EXPR_NEST_MAX )
2077: The maximum number of expressions that can be nested within
2078: parenthesis by the
2079: .Xr expr 1
2080: utility.
2081: .It Li user.line_max ( USER_LINE_MAX )
2082: The maximum length in bytes of a text-processing utility's input
2083: line.
2084: .It Li user.posix2_char_term ( USER_POSIX2_CHAR_TERM )
2085: Return 1 if the system supports at least one terminal type capable of
1.58 wiz 2086: all operations described in
2087: .St -p1003.2 ,
2088: otherwise\ 0.
1.1 pavel 2089: .It Li user.posix2_c_bind ( USER_POSIX2_C_BIND )
2090: Return 1 if the system's C-language development facilities support the
1.56 uwe 2091: C-Language Bindings Option, otherwise\ 0.
1.1 pavel 2092: .It Li user.posix2_c_dev ( USER_POSIX2_C_DEV )
2093: Return 1 if the system supports the C-Language Development Utilities Option,
1.56 uwe 2094: otherwise\ 0.
1.1 pavel 2095: .It Li user.posix2_fort_dev ( USER_POSIX2_FORT_DEV )
2096: Return 1 if the system supports the FORTRAN Development Utilities Option,
1.56 uwe 2097: otherwise\ 0.
1.1 pavel 2098: .It Li user.posix2_fort_run ( USER_POSIX2_FORT_RUN )
2099: Return 1 if the system supports the FORTRAN Runtime Utilities Option,
1.56 uwe 2100: otherwise\ 0.
1.1 pavel 2101: .It Li user.posix2_localedef ( USER_POSIX2_LOCALEDEF )
1.56 uwe 2102: Return 1 if the system supports the creation of locales, otherwise\ 0.
1.1 pavel 2103: .It Li user.posix2_sw_dev ( USER_POSIX2_SW_DEV )
2104: Return 1 if the system supports the Software Development Utilities Option,
1.56 uwe 2105: otherwise\ 0.
1.1 pavel 2106: .It Li user.posix2_upe ( USER_POSIX2_UPE )
2107: Return 1 if the system supports the User Portability Utilities Option,
1.56 uwe 2108: otherwise\ 0.
1.1 pavel 2109: .It Li user.posix2_version ( USER_POSIX2_VERSION )
1.58 wiz 2110: The version of
2111: .St -p1003.2
2112: with which the system attempts to comply.
1.1 pavel 2113: .It Li user.re_dup_max ( USER_RE_DUP_MAX )
2114: The maximum number of repeated occurrences of a regular expression
2115: permitted when using interval notation.
2116: .It Li user.stream_max ( USER_STREAM_MAX )
2117: The minimum maximum number of streams that a process may have open
2118: at any one time.
2119: .It Li user.tzname_max ( USER_TZNAME_MAX )
2120: The minimum maximum number of types supported for the name of a
2121: timezone.
2122: .El
1.50 jruoho 2123: .Ss The vm.* subtree ( CTL_VM )
1.1 pavel 2124: The string and integer information available for the
2125: .Li vm
2126: level is detailed below.
2127: The changeable column shows whether a process with appropriate
2128: privilege may change the value.
1.21 joerg 2129: .Bl -column "Second level name" "struct uvmexp_sysctl" "Changeable" -offset indent
1.1 pavel 2130: .It Sy Second level name Type Changeable
2131: .It vm.anonmax int yes
2132: .It vm.anonmin int yes
2133: .It vm.bufcache int yes
2134: .It vm.bufmem int no
2135: .It vm.bufmem_hiwater int yes
2136: .It vm.bufmem_lowater int yes
2137: .It vm.execmax int yes
2138: .It vm.execmin int yes
2139: .It vm.filemax int yes
2140: .It vm.filemin int yes
2141: .It vm.loadavg struct loadavg no
2142: .It vm.maxslp int no
2143: .It vm.nkmempages int no
2144: .It vm.uspace int no
2145: .It vm.uvmexp struct uvmexp no
2146: .It vm.uvmexp2 struct uvmexp_sysctl no
2147: .It vm.vmmeter struct vmtotal no
2148: .El
2149: .Pp
2150: .Bl -tag -width "123456"
2151: .It Li vm.anonmax ( VM_ANONMAX )
2152: The percentage of physical memory which will be reclaimed
2153: from other types of memory usage to store anonymous application data.
2154: .It Li vm.anonmin ( VM_ANONMIN )
2155: The percentage of physical memory which will be always be available for
2156: anonymous application data.
2157: .It Li vm.bufcache ( VM_BUFCACHE )
2158: The percentage of physical memory which will be available
2159: for the buffer cache.
2160: .It Li vm.bufmem ( VM_BUFMEM )
2161: The amount of kernel memory that is being used by the buffer cache.
2162: .It Li vm.bufmem_lowater ( VM_BUFMEM_LOWATER )
2163: The minimum amount of kernel memory to reserve for the
2164: buffer cache.
2165: .It Li vm.bufmem_hiwater ( VM_BUFMEM_HIWATER )
2166: The maximum amount of kernel memory to be used for the
2167: buffer cache.
2168: .It Li vm.execmax ( VM_EXECMAX )
2169: The percentage of physical memory which will be reclaimed
2170: from other types of memory usage to store cached executable data.
2171: .It Li vm.execmin ( VM_EXECMIN )
2172: The percentage of physical memory which will be always be available for
2173: cached executable data.
2174: .It Li vm.filemax ( VM_FILEMAX )
2175: The percentage of physical memory which will be reclaimed
2176: from other types of memory usage to store cached file data.
2177: .It Li vm.filemin ( VM_FILEMIN )
2178: The percentage of physical memory which will be always be available for
2179: cached file data.
2180: .It Li vm.loadavg ( VM_LOADAVG )
2181: Return the load average history.
2182: The returned data consists of a
1.56 uwe 2183: .Vt struct loadavg .
1.1 pavel 2184: .It Li vm.maxslp ( VM_MAXSLP )
2185: The value of the maxslp kernel global variable.
2186: .It Li vm.vmmeter ( VM_METER )
2187: Return system wide virtual memory statistics.
2188: The returned data consists of a
1.56 uwe 2189: .Vt struct vmtotal .
1.31 drochner 2190: .It vm.user_va0_disable
1.56 uwe 2191: A flag which controls whether user processes can map virtual address\ 0.
1.1 pavel 2192: .It Li vm.uspace ( VM_USPACE )
2193: The number of bytes allocated for each kernel stack.
2194: .It Li vm.uvmexp ( VM_UVMEXP )
2195: Return system wide virtual memory statistics.
2196: The returned data consists of a
1.56 uwe 2197: .Vt struct uvmexp .
1.1 pavel 2198: .It Li vm.uvmexp2 ( VM_UVMEXP2 )
2199: Return system wide virtual memory statistics.
2200: The returned data consists of a
1.56 uwe 2201: .Vt struct uvmexp_sysctl .
1.1 pavel 2202: .\" XXX vm.idlezero
2203: .El
1.50 jruoho 2204: .Ss The ddb.* subtree ( CTL_DDB )
1.34 jruoho 2205: The information available for the
1.1 pavel 2206: .Li ddb
2207: level is detailed below.
2208: The changeable column shows whether a process with appropriate
2209: privilege may change the value.
2210: .\" XXX sort
1.21 joerg 2211: .Bl -column "Second level name" "integer" "Changeable" -offset indent
1.1 pavel 2212: .It Sy Second level name Type Changeable
2213: .It ddb.radix integer yes
2214: .It ddb.maxoff integer yes
1.34 jruoho 2215: .It ddb.maxwidth integer yes
1.1 pavel 2216: .It ddb.lines integer yes
2217: .It ddb.tabstops integer yes
2218: .It ddb.onpanic integer yes
2219: .It ddb.fromconsole integer yes
1.34 jruoho 2220: .It ddb.tee_msgbuf integer yes
2221: .It ddb.commandonenter string yes
1.1 pavel 2222: .El
2223: .Pp
2224: .Bl -tag -width "123456"
1.35 jruoho 2225: .It Li ddb.radix ( DDBCTL_RADIX )
1.1 pavel 2226: The input and output radix.
1.35 jruoho 2227: .It Li ddb.maxoff ( DDBCTL_MAXOFF )
1.1 pavel 2228: The maximum symbol offset.
1.34 jruoho 2229: .It Li ddb.maxwidth ( DDBCTL_MAXWIDTH )
2230: The maximum output line width.
1.35 jruoho 2231: .It Li ddb.lines ( DDBCTL_LINES )
1.1 pavel 2232: Number of display lines.
1.35 jruoho 2233: .It Li ddb.tabstops ( DDBCTL_TABSTOPS )
1.1 pavel 2234: Tab width.
1.35 jruoho 2235: .It Li ddb.onpanic ( DDBCTL_ONPANIC )
1.63 riz 2236: If greater than zero, DDB will be entered if the kernel panics.
2237: A value of 1 causes the system to enter DDB on panic, while a value of 2
2238: causes the kernel to attempt to print out a stack trace before entering DDB.
2239: A value of 0 causes the kernel to attempt to print a stack trace, then
1.64 wiz 2240: reboot, while a value of \-1 means neither a stack trace will be printed
1.63 riz 2241: nor DDB entered.
1.35 jruoho 2242: .It Li ddb.fromconsole ( DDBCTL_FROMCONSOLE )
1.1 pavel 2243: If not zero, DDB may be entered by sending a break on a serial
2244: console or by a special key sequence on a graphics console.
1.34 jruoho 2245: .It Li ddb.tee_msgbuf
2246: If not zero, DDB will output also to the kernel message buffer.
2247: .It Li ddb.commandonenter
2248: If not empty, a command to be executed on each enter to the
2249: .Tn DDB .
2250: .\"
2251: .\" XXX: (a) ddb.commandonenter is missing in ddb(4);
2252: .\" (b) No DDBCTL definitions for tee_msgbuf and commandonenter.
1.1 pavel 2253: .El
2254: .Pp
1.34 jruoho 2255: Some of these
2256: .Tn MIB
2257: nodes are also available as variables from within the debugger.
1.1 pavel 2258: See
2259: .Xr ddb 4
2260: for more details.
1.50 jruoho 2261: .Ss The security.* subtree ( CTL_SECURITY )
1.1 pavel 2262: The
2263: .Li security
2264: level contains various security-related settings for
1.2 wiz 2265: the system.
1.43 jruoho 2266: The available second level names are:
2267: .Bl -column "Second level name" "integer" "Changeable" -offset indent
2268: .It Sy Second level name Type Changeable
2269: .It Li security.curtain integer yes
2270: .It Li security.models node not applicable
2271: .It Li security.pax node not applicable
2272: .El
2273: .Pp
1.2 wiz 2274: Available settings are detailed below.
1.1 pavel 2275: .Pp
2276: .Bl -tag -width "123456"
2277: .It Li security.curtain
1.43 jruoho 2278: If non-zero, will filter return objects according to the user
2279: .Tn ID
1.1 pavel 2280: requesting information about them, preventing from users any
1.43 jruoho 2281: access to objects they do not own.
1.1 pavel 2282: .Pp
2283: At the moment, it affects
2284: .Xr ps 1 ,
2285: .Xr netstat 1
2286: (for
2287: .Dv PF_INET ,
2288: .Dv PF_INET6 ,
2289: and
2290: .Dv PF_UNIX
2291: PCBs), and
2292: .Xr w 1 .
1.4 elad 2293: .It Li security.models
2294: .Nx
2295: supports pluggable security models.
1.17 ad 2296: Every security model used, whether if loaded as a module or built with the system,
1.4 elad 2297: is required to add an entry to this node with at least one element,
2298: .Dq name ,
2299: indicating the name of the security model.
2300: .Pp
2301: In addition to the name, any settings and other information private to the
2302: security model will be available under this node.
2303: See
2304: .Xr secmodel 9
2305: for more information.
1.1 pavel 2306: .It Li security.pax
2307: Settings for PaX -- exploit mitigation features.
1.4 elad 2308: For more information on any of the PaX features, please see
2309: .Xr paxctl 8
2310: and
1.62 jruoho 2311: .Xr security 7 .
1.43 jruoho 2312: The available third and fourth level names are:
2313: .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \
2314: -offset 2n
2315: .It Sy Third and fourth level names Ta Sy Type Ta Sy Changeable
2316: .It Li security.pax.aslr.enabled integer yes
2317: .\".It Li security.pax.aslr.exec_len integer yes
2318: .It Li security.pax.aslr.global integer yes
2319: .\".It Li security.pax.aslr.mmap_len integer yes
2320: .\".It Li security.pax.aslr.stack_len integer yes
2321: .It Li security.pax.mprotect.enabled integer yes
2322: .It Li security.pax.mprotect.global integer yes
2323: .It Li security.pax.segvguard.enabled integer yes
2324: .It Li security.pax.segvguard.expiry_timeout integer yes
2325: .It Li security.pax.segvguard.global integer yes
2326: .It Li security.pax.segvguard.max_crashes integer yes
2327: .It Li security.pax.segvguard.suspend_timeout integer yes
2328: .El
1.1 pavel 2329: .Pp
2330: .Bl -tag -width "123456"
1.43 jruoho 2331: .It Li security.pax.aslr.enabled
1.14 elad 2332: Enable PaX ASLR (Address Space Layout Randomization).
2333: .Pp
2334: The value of this
2335: knob must be non-zero for PaX ASLR to be enabled, even if a program is set to
2336: explicit enable.
1.43 jruoho 2337: .\".It Li security.pax.aslr.exec_len
2338: .\" XXX: Undocumented.
1.14 elad 2339: .It Li security.pax.aslr.global
2340: Specifies the default global policy for programs without an
2341: explicit enable/disable flag.
2342: .Pp
2343: When non-zero, all programs will get PaX ASLR, except those exempted with
1.69 ! wiz 2344: .Xr paxctl 8 .
1.14 elad 2345: Otherwise, all programs will not get PaX ASLR, except those specifically
2346: marked as such with
2347: .Xr paxctl 8 .
1.43 jruoho 2348: .\".It Li security.pax.aslr.mmap_len
2349: .\" XXX: Undocumented.
2350: .\" .It Li security.pax.aslr.stack_len
2351: .\" XXX: Undocumented.
2352: .It Li security.pax.mprotect.enabled
1.1 pavel 2353: Enable PaX MPROTECT restrictions.
2354: .Pp
2355: These are
2356: .Xr mprotect 2
1.2 wiz 2357: restrictions to better enforce a W^X policy.
2358: The value of this
1.1 pavel 2359: knob must be non-zero for PaX MPROTECT to be enabled, even if a
2360: program is set to explicit enable.
2361: .It Li security.pax.mprotect.global
2362: Specifies the default global policy for programs without an
2363: explicit enable/disable flag.
2364: .Pp
2365: When non-zero, all programs will get the PaX MPROTECT restrictions,
2366: except those exempted with
1.69 ! wiz 2367: .Xr paxctl 8 .
1.1 pavel 2368: Otherwise, all programs will not get the PaX MPROTECT restrictions,
2369: except those specifically marked as such with
1.4 elad 2370: .Xr paxctl 8 .
1.43 jruoho 2371: .It Li security.pax.segvguard.enabled
1.1 pavel 2372: Enable PaX Segvguard.
2373: .Pp
2374: PaX Segvguard can detect and prevent certain exploitation attempts, where
2375: an attacker may try for example to brute-force function return addresses
2376: of respawning daemons.
2377: .Pp
2378: .Em Note :
2379: The
2380: .Nx
2381: interface and implementation of the Segvguard is still experimental, and may
2382: change in future releases.
1.43 jruoho 2383: .It Li security.pax.segvguard.expiry_timeout
2384: If the max number was not reached within this timeout (in seconds), the entry
2385: will expire.
1.1 pavel 2386: .It Li security.pax.segvguard.global
2387: Specifies the default global policy for programs without an
2388: explicit enable/disable flag.
2389: .Pp
2390: When non-zero, all programs will get the PaX Segvguard,
2391: except those exempted with
1.69 ! wiz 2392: .Xr paxctl 8 .
1.2 wiz 2393: Otherwise, no program will get the PaX Segvguard restrictions,
1.1 pavel 2394: except those specifically marked as such with
1.4 elad 2395: .Xr paxctl 8 .
1.43 jruoho 2396: .It Li security.pax.segvguard.max_crashes
2397: The maximum number of segfaults a program can receive before suspension.
1.1 pavel 2398: .It Li security.pax.segvguard.suspend_timeout
2399: Number of seconds to suspend a user from running a faulting program when the
2400: limit was exceeded.
2401: .El
2402: .El
1.50 jruoho 2403: .Ss The vendor.* subtree ( CTL_VENDOR )
1.1 pavel 2404: The
2405: .Li vendor
2406: toplevel name is reserved to be used by vendors who wish to
2407: have their own private MIB tree.
2408: Intended use is to store values under
2409: .Dq vendor.\*[Lt]yourname\*[Gt].* .
2410: .Sh SEE ALSO
2411: .Xr sysctl 3 ,
2412: .Xr ipsec 4 ,
2413: .Xr tcp 4 ,
1.62 jruoho 2414: .Xr security 7 ,
1.1 pavel 2415: .Xr sysctl 8
2416: .Sh HISTORY
2417: The
2418: .Nm
2419: variables first appeared in
2420: .Bx 4.4 .
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