Annotation of src/share/man/man7/sysctl.7, Revision 1.113
1.113 ! pgoyette 1: .\" $NetBSD: sysctl.7,v 1.112 2017/03/25 05:51:28 pgoyette Exp $
1.1 pavel 2: .\"
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4: .\" The Regents of the University of California. All rights reserved.
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30: .\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95
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1.111 pgoyette 32: .Dd March 25, 2017
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,
1.91 kamil 135: .Li vfs.generic ( Dv 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"
1.91 kamil 139: .It Li vfs.generic.maxtypenum ( Dv VFS_MAXTYPENUM )
1.57 wiz 140: The highest valid file system type number.
1.91 kamil 141: .It Li vfs.generic.conf ( Dv VFS_CONF )
1.57 wiz 142: Returns configuration information about the file system type given as a fourth
1.26 elad 143: level identifier.
1.91 kamil 144: .It Li vfs.generic.usermount ( Dv VFS_USERMOUNT )
1.68 jym 145: Determines if non superuser mounts are allowed, defaults to
1.59 christos 146: .Dv 0 .
1.91 kamil 147: .It Li vfs.generic.magiclinks ( Dv VFS_MAGICLINKS )
1.59 christos 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.
1.77 apb 167: It defaults to 1 and it should always be on to ensure integrity
168: of file system metadata in the event of a power loss.
1.54 christos 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
1.107 wiz 191: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.1 pavel 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
1.84 njoly 201: .It hw.ncpuonline integer no
1.1 pavel 202: .It hw.pagesize integer no
203: .It hw.physmem integer no
204: .It hw.physmem64 quad no
205: .It hw.usermem integer no
206: .It hw.usermem64 quad no
207: .El
208: .Bl -tag -width "123456"
1.91 kamil 209: .It Li hw.alignbytes ( Dv HW_ALIGNBYTES )
1.1 pavel 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.
1.91 kamil 216: .It Li hw.byteorder ( Dv HW_BYTEORDER )
1.56 uwe 217: The byteorder (4321, or 1234).
1.91 kamil 218: .It Li hw.cnmagic ( Dv HW_CNMAGIC )
1.1 pavel 219: The console magic key sequence.
1.91 kamil 220: .It Li hw.disknames ( Dv HW_DISKNAMES )
1.1 pavel 221: The list of (space separated) disk device names on the system.
1.91 kamil 222: .It Li hw.iostatnames ( Dv HW_IOSTATNAMES )
1.1 pavel 223: A space separated list of devices that will have I/O statistics
224: collected on them.
1.91 kamil 225: .It Li hw.iostats ( Dv HW_IOSTATS )
1.1 pavel 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).
1.91 kamil 245: .It Li hw.machine ( Dv HW_MACHINE )
1.1 pavel 246: The machine class.
1.91 kamil 247: .It Li hw.machine_arch ( Dv HW_MACHINE_ARCH )
1.1 pavel 248: The machine CPU class.
1.91 kamil 249: .It Li hw.model ( Dv HW_MODEL )
1.1 pavel 250: The machine model.
1.91 kamil 251: .It Li hw.ncpu ( Dv HW_NCPU )
1.84 njoly 252: The number of CPUs configured.
1.91 kamil 253: .It Li hw.ncpuonline ( Dv HW_NCPUONLINE )
1.84 njoly 254: The number of CPUs online.
1.91 kamil 255: .It Li hw.pagesize ( Dv HW_PAGESIZE )
1.1 pavel 256: The software page size.
1.91 kamil 257: .It Li hw.physmem ( Dv HW_PHYSMEM )
1.1 pavel 258: The bytes of physical memory as a 32-bit integer.
1.91 kamil 259: .It Li hw.physmem64 ( Dv HW_PHYSMEM64 )
1.1 pavel 260: The bytes of physical memory as a 64-bit integer.
1.91 kamil 261: .It Li hw.usermem ( Dv HW_USERMEM )
1.1 pavel 262: The bytes of non-kernel memory as a 32-bit integer.
1.91 kamil 263: .It Li hw.usermem64 ( Dv HW_USERMEM64 )
1.1 pavel 264: The bytes of non-kernel memory as a 64-bit integer.
265: .El
1.50 jruoho 266: .Ss The kern.* subtree
1.43 jruoho 267: This subtree includes data generally related to the kernel.
1.1 pavel 268: The string and integer information available for the
269: .Li kern
270: level is detailed below.
271: The changeable column shows whether a process with appropriate
272: privilege may change the value.
1.43 jruoho 273: .Bl -column "kern.posix_reader_writer_locks" \
274: "struct kinfo_drivers" "not applicable"
1.107 wiz 275: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.51 jruoho 276: .It kern.aio_listio_max integer yes
277: .It kern.aio_max integer yes
1.44 jruoho 278: .It kern.arandom integer no
1.1 pavel 279: .It kern.argmax integer no
1.39 jruoho 280: .It kern.boothowto integer no
1.1 pavel 281: .It kern.boottime struct timeval no
1.85 apb 282: .It kern.buildinfo string no
1.39 jruoho 283: .\".It kern.bufq node not applicable
1.1 pavel 284: .It kern.ccpu integer no
285: .It kern.clockrate struct clockinfo no
286: .It kern.consdev integer no
1.39 jruoho 287: .It kern.coredump node not applicable
1.21 joerg 288: .It kern.cp_id struct no
289: .It kern.cp_time uint64_t[\|] no
1.46 jruoho 290: .It kern.cryptodevallowsoft integer yes
1.1 pavel 291: .It kern.defcorename string yes
1.38 jruoho 292: .It kern.detachall integer yes
1.1 pavel 293: .It kern.domainname string yes
294: .It kern.drivers struct kinfo_drivers no
1.39 jruoho 295: .It kern.dump_on_panic integer yes
1.1 pavel 296: .It kern.file struct file no
297: .It kern.forkfsleep integer yes
298: .It kern.fscale integer no
299: .It kern.fsync integer no
1.21 joerg 300: .It kern.hardclock_ticks integer no
1.1 pavel 301: .It kern.hostid integer yes
302: .It kern.hostname string yes
1.21 joerg 303: .It kern.iov_max integer no
1.39 jruoho 304: .It kern.ipc node not applicable
1.21 joerg 305: .It kern.job_control integer no
1.1 pavel 306: .It kern.labeloffset integer no
307: .It kern.labelsector integer no
1.21 joerg 308: .It kern.login_name_max integer no
1.1 pavel 309: .It kern.logsigexit integer yes
1.21 joerg 310: .It kern.mapped_files integer no
1.1 pavel 311: .It kern.maxfiles integer yes
1.70 christos 312: .It kern.maxlwp integer yes
1.1 pavel 313: .It kern.maxpartitions integer no
314: .It kern.maxphys integer no
315: .It kern.maxproc integer yes
316: .It kern.maxptys integer yes
317: .It kern.maxvnodes integer yes
1.102 pgoyette 318: .It kern.messages integer yes
1.1 pavel 319: .It kern.mbuf node not applicable
320: .It kern.memlock integer no
1.21 joerg 321: .It kern.memlock_range integer no
322: .It kern.memory_protection integer no
1.42 jruoho 323: .It kern.module node not applicable
1.21 joerg 324: .It kern.monotonic_clock integer no
1.49 jruoho 325: .It kern.mqueue node not applicable
1.1 pavel 326: .It kern.msgbuf integer no
327: .It kern.msgbufsize integer no
328: .It kern.ngroups integer no
1.41 jruoho 329: .\".It kern.no_sa_support integer yes
1.1 pavel 330: .It kern.ntptime struct ntptimeval no
331: .It kern.osrelease string no
1.39 jruoho 332: .It kern.osrevision integer no
1.1 pavel 333: .It kern.ostype string no
1.41 jruoho 334: .\".It kern.panic_now integer yes
1.1 pavel 335: .It kern.pipe node not applicable
1.82 joerg 336: .It kern.pool struct pool_sysctl no
1.39 jruoho 337: .\" .It kern.posix node not applicable
338: .It kern.posix1version integer no
1.51 jruoho 339: .It kern.posix_aio integer no
1.21 joerg 340: .It kern.posix_barriers integer no
341: .It kern.posix_reader_writer_locks integer no
1.39 jruoho 342: .\".It kern.posix_sched integer yes
1.21 joerg 343: .It kern.posix_semaphores integer no
344: .It kern.posix_spin_locks integer no
345: .It kern.posix_threads integer no
346: .It kern.posix_timers integer no
1.1 pavel 347: .It kern.proc struct kinfo_proc no
348: .It kern.proc2 struct kinfo_proc2 no
1.21 joerg 349: .It kern.proc_args string no
1.39 jruoho 350: .It kern.profiling node not applicable
1.41 jruoho 351: .\".It kern.pset node not applicable
1.1 pavel 352: .It kern.rawpartition integer no
1.21 joerg 353: .It kern.root_device string no
354: .It kern.root_partition integer no
355: .It kern.rtc_offset integer yes
356: .It kern.saved_ids integer no
1.39 jruoho 357: .It kern.sbmax integer yes
1.108 hubertf 358: .It kern.sched node not applicable
1.1 pavel 359: .It kern.securelevel integer raise only
1.39 jruoho 360: .It kern.somaxkva integer yes
1.21 joerg 361: .It kern.synchronized_io integer no
1.19 christos 362: .It kern.timecounter node not applicable
1.1 pavel 363: .It kern.timex struct no
364: .It kern.tkstat node not applicable
1.66 christos 365: .It kern.tty node not applicable
1.1 pavel 366: .It kern.urandom integer no
1.45 jruoho 367: .It kern.usercrypto integer yes
368: .It kern.userasymcrypto integer yes
1.39 jruoho 369: .It kern.veriexec node not applicable
1.1 pavel 370: .It kern.version string no
371: .It kern.vnode struct vnode no
372: .El
373: .Bl -tag -width "123456"
1.51 jruoho 374: .It Li kern.aio_listio_max
375: The maximum number of asynchronous
376: .Tn I/O
377: operations in a single list I/O call.
378: Like with all variables related to
379: .Xr aio 3 ,
380: the variable may be created and removed dynamically
381: upon loading or unloading the corresponding kernel module.
382: .It Li kern.aio_max
383: The maximum number of asynchronous I/O operations.
1.44 jruoho 384: .It Li kern.arandom
385: This variable picks a random number each time it is queried.
386: The used random number generator
1.56 uwe 387: .Pf ( Tn RNG )
1.44 jruoho 388: is based on
389: .Xr arc4random 3 .
1.91 kamil 390: .It Li kern.argmax ( Dv KERN_ARGMAX )
1.1 pavel 391: The maximum bytes of argument to
392: .Xr execve 2 .
1.23 apb 393: .It Li kern.boothowto
394: Flags passed from the boot loader; see
395: .Xr reboot 2
396: for the meanings of the flags.
1.91 kamil 397: .It Li kern.boottime ( Dv KERN_BOOTTIME )
1.1 pavel 398: A
1.56 uwe 399: .Vt struct timeval
1.1 pavel 400: structure is returned.
401: This structure contains the time that the system was booted.
1.104 pgoyette 402: .It Li kern.bufq
403: This variable contains information on the
404: .Xr bufq 9
405: subsystem.
406: Currently, the only third level name implemented is
407: .Dv kern.bufq.strategies
408: which provides a list of buffer queue strategies currently available.
1.85 apb 409: .It Li kern.buildinfo
410: When the kernel is built, the build environment may optionally provide
411: arbitrary information to be stored in this variable.
1.91 kamil 412: .It Li kern.ccpu ( Dv KERN_CCPU )
1.1 pavel 413: The scheduler exponential decay value.
1.91 kamil 414: .It Li kern.clockrate ( Dv KERN_CLOCKRATE )
1.1 pavel 415: A
1.56 uwe 416: .Vt struct clockinfo
1.1 pavel 417: structure is returned.
418: This structure contains the clock, statistics clock and profiling clock
419: frequencies, the number of micro-seconds per hz tick, and the clock
420: skew rate.
1.36 jruoho 421: Refer to
422: .Xr hz 9
423: for additional details.
1.91 kamil 424: .It Li kern.consdev ( Dv KERN_CONSDEV )
1.1 pavel 425: Console device.
1.39 jruoho 426: .It Li kern.coredump
427: Settings related to set-id processes coredumps.
428: By default, set-id processes do not dump core in situations where
429: other processes would.
430: The settings in this node allows an administrator to change this
431: behavior.
432: .Pp
433: The third level name is
434: .Dv kern.coredump.setid
1.40 jruoho 435: and fourth level variables are described below.
436: .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent
1.107 wiz 437: .It Sy Fourth level name Ta Sy Type Ta Sy Changeable
1.40 jruoho 438: .It kern.coredump.setid.dump integer yes
439: .It kern.coredump.setid.group integer yes
440: .It kern.coredump.setid.mode integer yes
441: .It kern.coredump.setid.owner integer yes
442: .It kern.coredump.setid.path string yes
443: .El
1.39 jruoho 444: .Bl -tag -width "123456"
445: .It Li kern.coredump.setid.dump
446: If non-zero, set-id processes will dump core.
447: .It Li kern.coredump.setid.group
448: The group-id for the set-id processes' coredump.
449: .It Li kern.coredump.setid.mode
450: The mode for the set-id processes' coredump.
451: See
452: .Xr chmod 1 .
453: .It Li kern.coredump.setid.owner
454: The user-id that will be used as the owner of the set-id processes'
455: coredump.
456: .It Li kern.coredump.setid.path
457: The path to which set-id processes' coredumps will be saved to.
458: Same syntax as kern.defcorename.
459: .El
1.91 kamil 460: .It Li kern.cp_id ( Dv KERN_CP_ID )
1.1 pavel 461: Mapping of CPU number to CPU id.
1.91 kamil 462: .It Li kern.cp_time ( Dv KERN_CP_TIME )
1.56 uwe 463: Returns an array of
464: .Dv CPUSTATES
1.101 wiz 465: .Vt uint64_t Ns s .
1.1 pavel 466: This array contains the
467: number of clock ticks spent in different CPU states.
468: On multi-processor systems, the sum across all CPUs is returned unless
469: appropriate space is given for one data set for each CPU.
470: Data for a specific CPU can also be obtained by adding the number of the
471: CPU at the end of the MIB, enlarging it by one.
1.46 jruoho 472: .It Li kern.cryptodevallowsoft
473: This variable controls userland access to hardware versus software transforms
474: in the
475: .Xr crypto 4
476: system.
477: The available values are as follows:
1.47 wiz 478: .Bl -tag -width XX0 -offset indent
479: .It Dv \*[Lt] 0
1.46 jruoho 480: Always force userlevel requests to use software transforms.
481: .It Dv = 0
482: If present, use hardware and grant userlevel requests for
483: non-accelerated transforms (handling the latter in software).
1.47 wiz 484: .It Dv \*[Gt] 0
1.46 jruoho 485: Allow user requests only for transforms which are hardware-accelerated.
486: .El
1.91 kamil 487: .It Li kern.defcorename ( Dv KERN_DEFCORENAME )
1.1 pavel 488: Default template for the name of core dump files (see also
489: .Li proc.pid.corename
490: in the per-process variables
491: .Li proc.* ,
492: and
493: .Xr core 5
494: for format of this template).
495: The default value is
1.56 uwe 496: .Pa %n.core
1.1 pavel 497: and can be changed with the kernel configuration option
498: .Cd options DEFCORENAME
499: (see
500: .Xr options 4
501: ).
1.38 jruoho 502: .It Li kern.detachall
503: Detach all devices at shutdown.
1.91 kamil 504: .It Li kern.domainname ( Dv KERN_DOMAINNAME )
1.1 pavel 505: Get or set the YP domain name.
1.91 kamil 506: .It Li kern.drivers ( Dv KERN_DRIVERS )
1.1 pavel 507: Return an array of
1.56 uwe 508: .Vt struct kinfo_drivers
1.1 pavel 509: that contains the name and major device numbers of all the device drivers
510: in the current kernel.
511: The
512: .Va d_name
513: field is always a NUL terminated string.
514: The
515: .Va d_bmajor
516: field will be set to \-1 if the driver doesn't have a block device.
1.91 kamil 517: .It Li kern.dump_on_panic ( Dv KERN_DUMP_ON_PANIC )
1.41 jruoho 518: Perform a crash dump on system
519: .Xr panic 9 .
1.91 kamil 520: .It Li kern.file ( Dv KERN_FILE )
1.1 pavel 521: Return the entire file table.
522: The returned data consists of a single
1.56 uwe 523: .Vt struct filelist
1.1 pavel 524: followed by an array of
1.56 uwe 525: .Vt struct file ,
1.1 pavel 526: whose size depends on the current number of such objects in the system.
1.91 kamil 527: .It Li kern.forkfsleep ( Dv KERN_FORKFSLEEP )
1.1 pavel 528: If
529: .Xr fork 2
530: system call fails due to limit on number of processes (either
531: the global maxproc limit or user's one), wait for this many
532: milliseconds before returning
533: .Er EAGAIN
534: error to process.
535: Useful to keep heavily forking runaway processes in bay.
536: Default zero (no sleep).
537: Maximum is 20 seconds.
1.91 kamil 538: .It Li kern.fscale ( Dv KERN_FSCALE )
1.1 pavel 539: The kernel fixed-point scale factor.
1.91 kamil 540: .It Li kern.fsync ( Dv KERN_FSYNC )
1.58 wiz 541: Return 1 if the
542: .St -p1003.1b-93
543: File Synchronization Option is available
1.1 pavel 544: on this system,
1.56 uwe 545: otherwise\ 0.
1.91 kamil 546: .It Li kern.hardclock_ticks ( Dv KERN_HARDCLOCK_TICKS )
1.1 pavel 547: Returns the number of
548: .Xr hardclock 9
549: ticks.
1.105 pgoyette 550: .It Li kern.hist
551: This variable contains kernel history data if the kernel was
552: configured for any of the options
553: .Dv UVHMIST ,
554: .Dv USB_DEBUG ,
555: .Dv BIOHIST ,
556: or
557: .Dv SCDEBUG .
558: (See
559: .Xr options 4
560: for more details.)
561: The third-level names correspond to each available history table.
562: The values of the history tables are in an internal format, and can be
563: decoded by the
564: .Xr vmstat 1
565: utility's
1.106 wiz 566: .Fl U
1.105 pgoyette 567: and
1.106 wiz 568: .Fl u
1.105 pgoyette 569: options;
1.106 wiz 570: the
571: .Fl l
572: option can be used to see which tables are available.
1.91 kamil 573: .It Li kern.hostid ( Dv KERN_HOSTID )
1.39 jruoho 574: Get or set the host identifier.
575: This is aimed to replace the legacy
576: .Xr gethostid 3
577: and
578: .Xr sethostid 3
579: system calls.
1.91 kamil 580: .It Li kern.hostname ( Dv KERN_HOSTNAME )
1.39 jruoho 581: Get or set the
582: .Xr hostname 1 .
1.91 kamil 583: .It Li kern.iov_max ( Dv KERN_IOV_MAX )
1.1 pavel 584: Return the maximum number of
1.56 uwe 585: .Vt iovec
1.1 pavel 586: structures that a process has available for use with
587: .Xr preadv 2 ,
588: .Xr pwritev 2 ,
589: .Xr readv 2 ,
590: .Xr recvmsg 2 ,
591: .Xr sendmsg 2
592: and
593: .Xr writev 2 .
1.91 kamil 594: .It Li kern.ipc ( Dv KERN_SYSVIPC )
1.39 jruoho 595: Return information about the SysV IPC parameters.
596: The third level names for the ipc variables are detailed below.
597: .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent
1.107 wiz 598: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.39 jruoho 599: .It kern.ipc.sysvmsg integer no
600: .It kern.ipc.sysvsem integer no
601: .It kern.ipc.sysvshm integer no
602: .It kern.ipc.sysvipc_info struct no
603: .It kern.ipc.shmmax integer yes
604: .It kern.ipc.shmmni integer yes
605: .It kern.ipc.shmseg integer yes
606: .It kern.ipc.shmmaxpgs integer yes
607: .It kern.ipc.shm_use_phys integer yes
608: .It kern.ipc.msgmni integer yes
609: .It kern.ipc.msgseg integer yes
610: .It kern.ipc.semmni integer yes
611: .It kern.ipc.semmns integer yes
612: .It kern.ipc.semmnu integer yes
613: .El
614: .Bl -tag -width "123456"
1.91 kamil 615: .It Li kern.ipc.sysvmsg ( Dv KERN_SYSVIPC_MSG )
1.39 jruoho 616: Returns 1 if System V style message queue functionality is available
617: on this system,
1.56 uwe 618: otherwise\ 0.
1.91 kamil 619: .It Li kern.ipc.sysvsem ( Dv KERN_SYSVIPC_SEM )
1.39 jruoho 620: Returns 1 if System V style semaphore functionality is available
621: on this system,
1.56 uwe 622: otherwise\ 0.
1.91 kamil 623: .It Li kern.ipc.sysvshm ( Dv KERN_SYSVIPC_SHM )
1.39 jruoho 624: Returns 1 if System V style share memory functionality is available
625: on this system,
1.56 uwe 626: otherwise\ 0.
1.91 kamil 627: .It Li kern.ipc.sysvipc_info ( Dv KERN_SYSVIPC_INFO )
1.39 jruoho 628: Return System V style IPC configuration and run-time information.
629: The fourth level name selects the System V style IPC facility.
630: .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent
1.107 wiz 631: .It Sy Fourth level name Ta Sy Type
1.39 jruoho 632: .It KERN_SYSVIPC_MSG_INFO struct msg_sysctl_info
633: .It KERN_SYSVIPC_SEM_INFO struct sem_sysctl_info
634: .It KERN_SYSVIPC_SHM_INFO struct shm_sysctl_info
635: .El
636: .Bl -tag -width "123456"
637: .It Li KERN_SYSVIPC_MSG_INFO
638: Return information on the System V style message facility.
639: The
640: .Sy msg_sysctl_info
641: structure is defined in
642: .In sys/msg.h .
643: .It Li KERN_SYSVIPC_SEM_INFO
644: Return information on the System V style semaphore facility.
645: The
646: .Sy sem_sysctl_info
647: structure is defined in
648: .In sys/sem.h .
649: .It Li KERN_SYSVIPC_SHM_INFO
650: Return information on the System V style shared memory facility.
651: The
652: .Sy shm_sysctl_info
653: structure is defined in
654: .In sys/shm.h .
655: .El
1.91 kamil 656: .It Li kern.ipc.shmmax ( Dv KERN_SYSVIPC_SHMMAX )
1.39 jruoho 657: Max shared memory segment size in bytes.
1.91 kamil 658: .It Li kern.ipc.shmmni ( Dv KERN_SYSVIPC_SHMMNI )
1.39 jruoho 659: Max number of shared memory identifiers.
1.91 kamil 660: .It Li kern.ipc.shmseg ( Dv KERN_SYSVIPC_SHMSEG )
1.39 jruoho 661: Max shared memory segments per process.
1.91 kamil 662: .It Li kern.ipc.shmmaxpgs ( Dv KERN_SYSVIPC_SHMMAXPGS )
1.39 jruoho 663: Max amount of shared memory in pages.
1.91 kamil 664: .It Li kern.ipc.shm_use_phys ( Dv KERN_SYSVIPC_SHMUSEPHYS )
1.39 jruoho 665: Locking of shared memory in physical memory.
666: If 0, memory can be swapped
667: out, otherwise it will be locked in physical memory.
668: .It Li kern.ipc.msgmni
669: Max number of message queue identifiers.
670: .It Li kern.ipc.msgseg
671: Max number of number of message segments.
672: .It Li kern.ipc.semmni
673: Max number of number of semaphore identifiers.
674: .It Li kern.ipc.semmns
675: Max number of number of semaphores in system.
676: .It Li kern.ipc.semmnu
677: Max number of undo structures in system.
678: .El
1.91 kamil 679: .It Li kern.job_control ( Dv KERN_JOB_CONTROL )
1.56 uwe 680: Return 1 if job control is available on this system, otherwise\ 0.
1.91 kamil 681: .It Li kern.labeloffset ( Dv KERN_LABELOFFSET )
1.56 uwe 682: The offset within the sector specified by
683: .Dv KERN_LABELSECTOR
684: of the
1.1 pavel 685: .Xr disklabel 5 .
1.91 kamil 686: .It Li kern.labelsector ( Dv KERN_LABELSECTOR )
1.1 pavel 687: The sector number containing the
688: .Xr disklabel 5 .
1.91 kamil 689: .It Li kern.login_name_max ( Dv KERN_LOGIN_NAME_MAX )
1.1 pavel 690: The size of the storage required for a login name, in bytes,
691: including the terminating NUL.
1.91 kamil 692: .It Li kern.logsigexit ( Dv KERN_LOGSIGEXIT )
1.1 pavel 693: If this flag is non-zero, the kernel will
694: .Xr log 9
695: all process exits due to signals which create a
696: .Xr core 5
697: file, and whether the coredump was created.
1.91 kamil 698: .It Li kern.mapped_files ( Dv KERN_MAPPED_FILES )
1.58 wiz 699: Returns 1 if the
700: .St -p1003.1b-93
701: Memory Mapped Files Option is available on this system,
1.56 uwe 702: otherwise\ 0.
1.91 kamil 703: .It Li kern.maxfiles ( Dv KERN_MAXFILES )
1.1 pavel 704: The maximum number of open files that may be open in the system.
1.91 kamil 705: .It Li kern.maxpartitions ( Dv KERN_MAXPARTITIONS )
1.1 pavel 706: The maximum number of partitions allowed per disk.
1.71 wiz 707: .It Li kern.maxlwp
1.70 christos 708: The maximum number of Lightweight Processes (threads) the system allows
709: per uid.
1.91 kamil 710: .It Li kern.maxphys ( Dv KERN_MAXPHYS )
1.1 pavel 711: Maximum raw I/O transfer size.
1.91 kamil 712: .It Li kern.maxproc ( Dv KERN_MAXPROC )
1.1 pavel 713: The maximum number of simultaneous processes the system will allow.
1.91 kamil 714: .It Li kern.maxptys ( Dv KERN_MAXPTYS )
1.1 pavel 715: The maximum number of pseudo terminals.
716: This value can be both raised and lowered, though it cannot
717: be set lower than number of currently used ptys.
718: See also
719: .Xr pty 4 .
1.91 kamil 720: .It Li kern.maxvnodes ( Dv KERN_MAXVNODES )
1.1 pavel 721: The maximum number of vnodes available on the system.
722: This can only be raised.
1.91 kamil 723: .It Li kern.mbuf ( Dv KERN_MBUF )
1.1 pavel 724: Return information about the mbuf control variables.
725: Mbufs are data structures which store network packets and other data
726: structures in the networking code, see
727: .Xr mbuf 9 .
728: The third level names for the mbuf variables are detailed below.
729: The changeable column shows whether a process with appropriate
730: privilege may change the value.
1.21 joerg 731: .Bl -column "kern.mbuf.nmbclusters" "integer" "Changeable" -offset indent
1.107 wiz 732: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.1 pavel 733: .\" XXX Changeable? really?
734: .It kern.mbuf.mblowat integer yes
735: .It kern.mbuf.mclbytes integer yes
736: .It kern.mbuf.mcllowat integer yes
737: .It kern.mbuf.msize integer yes
738: .It kern.mbuf.nmbclusters integer yes
739: .El
740: .Pp
741: The variables are as follows:
742: .Bl -tag -width "123456"
1.91 kamil 743: .It Li kern.mbuf.mblowat ( Dv MBUF_MBLOWAT )
1.1 pavel 744: The mbuf low water mark.
1.91 kamil 745: .It Li kern.mbuf.mclbytes ( Dv MBUF_MCLBYTES )
1.1 pavel 746: The mbuf cluster size.
1.91 kamil 747: .It Li kern.mbuf.mcllowat ( Dv MBUF_MCLLOWAT )
1.1 pavel 748: The mbuf cluster low water mark.
1.91 kamil 749: .It Li kern.mbuf.msize ( Dv MBUF_MSIZE )
1.1 pavel 750: The mbuf base size.
1.91 kamil 751: .It Li kern.mbuf.nmbclusters ( Dv MBUF_NMBCLUSTERS )
1.1 pavel 752: The limit on the number of mbuf clusters.
753: The variable can only be increased, and only increased on machines with
754: direct-mapped pool pages.
755: .El
1.91 kamil 756: .It Li kern.memlock ( Dv KERN_MEMLOCK )
1.58 wiz 757: Returns 1 if the
758: .St -p1003.1b-93
759: Process Memory Locking Option is available on this system,
1.56 uwe 760: otherwise\ 0.
1.91 kamil 761: .It Li kern.memlock_range ( Dv KERN_MEMLOCK_RANGE )
1.58 wiz 762: Returns 1 if the
763: .St -p1003.1b-93
764: Range Memory Locking Option is available on this system,
1.56 uwe 765: otherwise\ 0.
1.91 kamil 766: .It Li kern.memory_protection ( Dv KERN_MEMORY_PROTECTION )
1.58 wiz 767: Returns 1 if the
768: .St -p1003.1b-93
769: Memory Protection Option is available on this system,
1.56 uwe 770: otherwise\ 0.
1.102 pgoyette 771: .It Li kern.messages
772: Kernel console message verbosity.
773: See
774: .Sy \<sys/reboot.h\>
775: .Bl -column "verbosity" "setting" -offset indent
776: .It Sy Verbosity Setting
777: .It \ \ \ \ 0 Silent Sy AB_SILENT
778: .It \ \ \ \ 1 Quiet Sy AB_QUIET
779: .It \ \ \ \ 2 Normal Sy AB_NORMAL
780: .It \ \ \ \ 3 Verbose Sy AB_VERBOSE
781: .It \ \ \ \ 4 Debug Sy AB_DEBUG
782: .El
1.42 jruoho 783: .It Li kern.module
784: Settings related to kernel modules.
785: The third level names for the settings are described below.
786: .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent
1.107 wiz 787: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.42 jruoho 788: .It kern.module.autoload integer yes
1.78 pgoyette 789: .It kern.module.autotime integer yes
1.42 jruoho 790: .It kern.module.verbose integer yes
791: .El
792: .Pp
793: The variables are as follows:
794: .Bl -tag -width "123456"
795: .It Li kern.module.autoload
796: A boolean that controls whether kernel modules are loaded automatically.
1.52 jruoho 797: See
1.53 jruoho 798: .Xr module 7
1.42 jruoho 799: for additional details.
1.78 pgoyette 800: .It Li kern.module.autotime
801: An integer that controls the delay before an attempt is made to
1.79 wiz 802: automatically unload a module that was auto-loaded.
803: Setting this value to zero disables the auto-unload function.
1.42 jruoho 804: .It Li kern.module.verbose
805: A boolean that enables or disables verbose
806: debug messages related to kernel modules.
807: .El
1.91 kamil 808: .It Li kern.monotonic_clock ( Dv KERN_MONOTONIC_CLOCK )
1.58 wiz 809: Returns the standard version the implementation of the
810: .St -p1003.1b-93
1.49 jruoho 811: Monotonic Clock Option conforms to,
1.56 uwe 812: otherwise\ 0.
1.48 jruoho 813: .It Li kern.mqueue
814: Settings related to
815: .Tn POSIX
816: message queues; see
817: .Xr mqueue 3 .
818: This node is created dynamically when
819: the corresponding kernel module is loaded.
820: The third level names for the settings are described below.
821: .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent
1.107 wiz 822: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.48 jruoho 823: .It kern.mqueue.mq_open_max integer yes
824: .It kern.mqueue.mq_prio_max integer yes
825: .It kern.mqueue.mq_max_msgsize integer yes
826: .It kern.mqueue.mq_def_maxmsg integer yes
827: .It kern.mqueue.mq_max_maxmsg integer yes
828: .El
829: .Pp
830: The variables are:
831: .Bl -tag -width "123456"
832: .It Li kern.mqueue.mq_open_max
833: The maximum number of message queue descriptors any single process can open.
834: .It Li kern.mqueue.mq_prio_max
835: The maximum priority of a message.
836: .It Li kern.mqueue.mq_max_msgsize
837: The maximum size of a message in a message queue.
838: .It Li kern.mqueue.mq_def_maxmsg
839: The default maximum message count.
840: .It Li kern.mqueue.mq_max_maxmsg
841: The maximum number of messages in a message queue.
842: .El
1.91 kamil 843: .It Li kern.msgbuf ( Dv KERN_MSGBUF )
1.1 pavel 844: The kernel message buffer, rotated so that the head of the circular kernel
845: message buffer is at the start of the returned data.
846: The returned data may contain NUL bytes.
1.91 kamil 847: .It Li kern.msgbufsize ( Dv KERN_MSGBUFSIZE )
1.1 pavel 848: The maximum number of characters that the kernel message buffer can hold.
1.91 kamil 849: .It Li kern.ngroups ( Dv KERN_NGROUPS )
1.1 pavel 850: The maximum number of supplemental groups.
1.41 jruoho 851: .\" .It Li kern.no_sa_support
852: .\" XXX: Undocumented.
1.91 kamil 853: .It Li kern.ntptime ( Dv KERN_NTPTIME )
1.1 pavel 854: A
1.56 uwe 855: .Vt struct ntptimeval
1.1 pavel 856: structure is returned.
857: This structure contains data used by the
858: .Xr ntpd 8
859: program.
1.91 kamil 860: .It Li kern.osrelease ( Dv KERN_OSRELEASE )
1.1 pavel 861: The system release string.
1.91 kamil 862: .It Li kern.osrevision ( Dv KERN_OSREV )
1.1 pavel 863: The system revision string.
1.91 kamil 864: .It Li kern.ostype ( Dv KERN_OSTYPE )
1.1 pavel 865: The system type string.
1.41 jruoho 866: .\".It Li kern.panic_now
867: .\" XXX: Undocumented.
1.91 kamil 868: .It Li kern.pipe ( Dv KERN_PIPE )
1.1 pavel 869: Pipe settings.
870: The third level names for the integer pipe settings is detailed below.
871: The changeable column shows whether a process with appropriate
872: privilege may change the value.
1.21 joerg 873: .Bl -column "kern.pipe.maxbigpipes" "integer" "Changeable" -offset indent
1.107 wiz 874: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.1 pavel 875: .It kern.pipe.kvasiz integer yes
876: .It kern.pipe.maxbigpipes integer yes
877: .It kern.pipe.maxkvasz integer yes
878: .It kern.pipe.limitkva integer yes
879: .It kern.pipe.nbigpipes integer yes
880: .El
881: .Pp
882: The variables are as follows:
883: .Bl -tag -width "123456"
1.91 kamil 884: .It Li kern.pipe.kvasiz ( Dv KERN_PIPE_KVASIZ )
1.1 pavel 885: Amount of kernel memory consumed by pipe buffers.
1.91 kamil 886: .It Li kern.pipe.maxbigpipes ( Dv KERN_PIPE_MAXBIGPIPES )
1.56 uwe 887: Maximum number of
888: .Dq big
889: pipes.
1.91 kamil 890: .It Li kern.pipe.maxkvasz ( Dv KERN_PIPE_MAXKVASZ )
1.1 pavel 891: Maximum amount of kernel memory to be used for pipes.
1.91 kamil 892: .It Li kern.pipe.limitkva ( Dv KERN_PIPE_LIMITKVA )
1.1 pavel 893: Limit for direct transfers via page loan.
1.91 kamil 894: .It Li kern.pipe.nbigpipes ( Dv KERN_PIPE_NBIGPIPES )
1.56 uwe 895: Number of
896: .Dq big
897: pipes.
1.1 pavel 898: .El
1.82 joerg 899: .It Li kern.pool
900: Provides statistics about the
1.83 wiz 901: .Xr pool 9
1.82 joerg 902: and
903: .Xr pool_cache 9
904: subsystems.
1.39 jruoho 905: .\" XXX: Undocumented .It Li kern.posix ( ? )
906: .\" This is a node in which the only variable is semmax.
1.91 kamil 907: .It Li kern.posix1version ( Dv KERN_POSIX1 )
1.58 wiz 908: The version of ISO/IEC 9945
909: .Pq St -p1003.1
910: with which the system attempts to comply.
1.51 jruoho 911: .It Li kern.posix_aio
912: The version of
913: .St -p1003.1
914: and its Asynchronous I/O option to which the system attempts to conform.
1.91 kamil 915: .It Li kern.posix_barriers ( Dv KERN_POSIX_BARRIERS )
1.1 pavel 916: The version of
917: .St -p1003.1
918: and its
919: Barriers
920: option to which the system attempts to conform,
1.56 uwe 921: otherwise\ 0.
1.91 kamil 922: .It Li kern.posix_reader_writer_locks ( Dv KERN_POSIX_READER_WRITER_LOCKS )
1.1 pavel 923: The version of
924: .St -p1003.1
925: and its
926: Read-Write Locks
927: option to which the system attempts to conform,
1.56 uwe 928: otherwise\ 0.
1.41 jruoho 929: .\".It Li kern.posix_sched
930: .\" XXX: Undocumented.
1.91 kamil 931: .It Li kern.posix_semaphores ( Dv KERN_POSIX_SEMAPHORES )
1.1 pavel 932: The version of
933: .St -p1003.1
934: and its
935: Semaphores
936: option to which the system attempts to conform,
1.56 uwe 937: otherwise\ 0.
1.91 kamil 938: .It Li kern.posix_spin_locks ( Dv KERN_POSIX_SPIN_LOCKS )
1.1 pavel 939: The version of
940: .St -p1003.1
941: and its
942: Spin Locks
943: option to which the system attempts to conform,
1.56 uwe 944: otherwise\ 0.
1.91 kamil 945: .It Li kern.posix_threads ( Dv KERN_POSIX_THREADS )
1.1 pavel 946: The version of
947: .St -p1003.1
948: and its
949: Threads
950: option to which the system attempts to conform,
1.56 uwe 951: otherwise\ 0.
1.91 kamil 952: .It Li kern.posix_timers ( Dv KERN_POSIX_TIMERS )
1.1 pavel 953: The version of
954: .St -p1003.1
955: and its
956: Timers
957: option to which the system attempts to conform,
1.56 uwe 958: otherwise\ 0.
1.91 kamil 959: .It Li kern.proc ( Dv KERN_PROC )
1.1 pavel 960: Return the entire process table, or a subset of it.
961: An array of
1.56 uwe 962: .Vt struct kinfo_proc
1.1 pavel 963: structures is returned,
964: whose size depends on the current number of such objects in the system.
965: The third and fourth level numeric names are as follows:
1.21 joerg 966: .Bl -column "KERN_PROC_SESSION" "Fourth level is:" -offset indent
1.111 pgoyette 967: .It Sy Third level name Ta Sy Fourth level is :
1.21 joerg 968: .It KERN_PROC_ALL None
969: .It KERN_PROC_GID A group ID
970: .It KERN_PROC_PID A process ID
971: .It KERN_PROC_PGRP A process group
972: .It KERN_PROC_RGID A real group ID
973: .It KERN_PROC_RUID A real user ID
974: .It KERN_PROC_SESSION A session ID
975: .It KERN_PROC_TTY A tty device
976: .It KERN_PROC_UID A user ID
1.1 pavel 977: .El
1.91 kamil 978: .It Li kern.proc2 ( Dv KERN_PROC2 )
1.56 uwe 979: As for
980: .Dv KERN_PROC ,
981: but an array of
982: .Vt struct kinfo_proc2
1.1 pavel 983: structures are returned.
984: The fifth level name is the size of the
1.56 uwe 985: .Vt struct kinfo_proc2
1.1 pavel 986: and the sixth level name is the number of structures to return.
1.91 kamil 987: .It Li kern.proc_args ( Dv KERN_PROC_ARGS )
1.1 pavel 988: Return the argv or environment strings (or the number thereof)
989: of a process.
990: Multiple strings are returned separated by NUL characters.
991: The third level name is the process ID.
992: The fourth level name is as follows:
1.93 christos 993: .Bl -column "KERN_PROG_PATHNAME" "The full pathname of the executable" -offset indent
1.92 wiz 994: .It Dv KERN_PROC_ARGV The argv strings
995: .It Dv KERN_PROC_ENV The environ strings
996: .It Dv KERN_PROC_NARGV The number of argv strings
997: .It Dv KERN_PROC_NENV The number of environ strings
1.93 christos 998: .It Dv KERN_PROC_PATHNAME The full pathname of the executable
1.1 pavel 999: .El
1.91 kamil 1000: .It Li kern.profiling ( Dv KERN_PROF )
1.1 pavel 1001: Return profiling information about the kernel.
1002: If the kernel is not compiled for profiling,
1.56 uwe 1003: attempts to retrieve any of the
1004: .Dv KERN_PROF
1005: values will fail with
1.1 pavel 1006: .Er EOPNOTSUPP .
1007: The third level names for the string and integer profiling information
1008: is detailed below.
1009: The changeable column shows whether a process with appropriate
1010: privilege may change the value.
1.21 joerg 1011: .Bl -column "kern.profiling.gmonparam" "struct gmonparam" "Changeable" -offset indent
1.107 wiz 1012: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.1 pavel 1013: .It kern.profiling.count u_short[\|] yes
1014: .It kern.profiling.froms u_short[\|] yes
1015: .It kern.profiling.gmonparam struct gmonparam no
1016: .It kern.profiling.state integer yes
1017: .It kern.profiling.tos struct tostruct yes
1018: .El
1019: .Pp
1020: The variables are as follows:
1021: .Bl -tag -width "123456"
1.91 kamil 1022: .It Li kern.profiling.count ( Dv GPROF_COUNT )
1.1 pavel 1023: Array of statistical program counter counts.
1.91 kamil 1024: .It Li kern.profiling.froms ( Dv GPROF_FROMS )
1.1 pavel 1025: Array indexed by program counter of call-from points.
1.91 kamil 1026: .It Li kern.profiling.gmonparams ( Dv GPROF_GMONPARAM )
1.1 pavel 1027: Structure giving the sizes of the above arrays.
1.91 kamil 1028: .It Li kern.profiling.state ( Dv GPROF_STATE )
1.1 pavel 1029: Profiling state.
1.56 uwe 1030: If set to
1031: .Dv GMON_PROF_ON ,
1032: starts profiling.
1033: If set to
1034: .Dv GMON_PROF_OFF ,
1035: stops profiling.
1.91 kamil 1036: .It Li kern.profiling.tos ( Dv GPROF_TOS )
1.1 pavel 1037: Array of
1.56 uwe 1038: .Vt struct tostruct
1.1 pavel 1039: describing destination of calls and their counts.
1040: .El
1.41 jruoho 1041: .\" .It Li kern.pset
1042: .\" XXX: Undocumented.
1.91 kamil 1043: .It Li kern.rawpartition ( Dv KERN_RAWPARTITION )
1.1 pavel 1044: The raw partition of a disk (a == 0).
1.91 kamil 1045: .It Li kern.root_device ( Dv KERN_ROOT_DEVICE )
1.1 pavel 1046: The name of the root device (e.g.,
1047: .Dq wd0 ) .
1.91 kamil 1048: .It Li kern.root_partition ( Dv KERN_ROOT_PARTITION )
1.1 pavel 1049: The root partition on the root device (a == 0).
1.91 kamil 1050: .It Li kern.rtc_offset ( Dv KERN_RTC_OFFSET )
1.1 pavel 1051: Return the offset of real time clock from UTC in minutes.
1.91 kamil 1052: .It Li kern.saved_ids ( Dv KERN_SAVED_IDS )
1.1 pavel 1053: Returns 1 if saved set-group and saved set-user ID is available.
1.91 kamil 1054: .It Li kern.sbmax ( Dv KERN_SBMAX )
1.1 pavel 1055: Maximum socket buffer size.
1056: .\" XXX units?
1.91 kamil 1057: .It Li kern.securelevel ( Dv KERN_SECURELVL )
1.25 elad 1058: See
1059: .Xr secmodel_securelevel 9 .
1.108 hubertf 1060: .It Li kern.sched ( dynamic )
1061: Influence the scheduling of LWPs, their priorisation and how they are
1062: distributed on and moved between CPUs.
1063: .Bl -column "kern.sched.balance_period" "integer" "Changeable" -offset indent
1064: .It Sy Third level name Sy Type Sy Changeable
1065: .It kern.sched.cacheht_time integer yes
1066: .It kern.sched.balance_period integer yes
1067: .It kern.sched.average_weight integer yes
1068: .It kern.sched.min_catch integer yes
1069: .It kern.sched.timesoftints integer yes
1070: .It kern.sched.kpreempt_pri integer yes
1071: .It kern.sched.upreempt_pri integer yes
1072: .It kern.sched.maxts integer yes
1.109 wiz 1073: .It kern.sched.mints integer yes
1074: .It kern.sched.name string no
1.108 hubertf 1075: .It kern.sched.rtts integer no
1076: .It kern.sched.pri_min integer no
1077: .It kern.sched.pri_max integer no
1078: .El
1079: .Pp
1080: The variables are as follows:
1081: .Bl -tag -width "123456"
1082: .It Li kern.sched.cacheht_time ( dynamic )
1083: Cache hotness time in which a LWP is kept on one particular CPU
1.109 wiz 1084: and not moved to another CPU.
1085: This reduces the overhead of flushing and reloading caches.
1.108 hubertf 1086: Defaults to 3ms.
1.109 wiz 1087: Needs to be given in
1.108 hubertf 1088: .Dq hz
1089: units, see
1090: .Xr mstohz 9 .
1091: .It Li kern.sched.balance_period ( dynamic )
1092: Interval at which the CPU queues are checked for re-balancing.
1093: Defaults to 300ms.
1.109 wiz 1094: Needs to be given in
1.108 hubertf 1095: .Dq hz
1096: units, see
1097: .Xr mstohz 9 .
1098: .It Li kern.sched.average_weight ( dynamic )
1099: Can be used to influence how likely LWPs are to be migrated from
1.109 wiz 1100: one CPU's queue of LWPs that are ready to run to a different, idle CPU.
1.108 hubertf 1101: The value gives the percentage for weighting the average count of
1102: migratable threads from the past against the current number of
1.109 wiz 1103: migratable threads.
1104: A small value gives more weight to the past, a larger values more weight
1.108 hubertf 1105: on the current situation.
1.109 wiz 1106: Defaults to 50 and must be between 0 and 100.
1.108 hubertf 1107: .It Li kern.sched.min_catch ( dynamic )
1108: Minimum count of migratable (runable) threads for catching (stealing)
1109: from another CPU.
1110: Defaults to 1 but can be increased to decrease chance of thread
1.109 wiz 1111: migration between CPUs.
1.108 hubertf 1112: .It Li kern.sched.timesoftints ( dynamic )
1113: Enable tracking of CPU time for soft interrupts
1114: as part of a LWP's real execution time.
1115: Set to a non-zero value to enable,
1116: and see
1117: .Xr ps 1
1118: for printing CPU times.
1119: .It Li kern.sched.kpreempt_pri ( dynamic )
1120: Minimum priority to trigger kernel preemption.
1121: .It Li kern.sched.upreempt_pri ( dynamic )
1122: Minimum priority to trigger user preemption.
1123: .It Li kern.sched.maxts ( dynamic )
1124: Scheduler specific maximal time quantum (in milliseconds).
1125: Must be set to a value larger than
1126: .Dq mints
1127: and between 10 and
1.109 wiz 1128: .Dq hz
1.108 hubertf 1129: as given by the
1130: .Dv kern.clockrate
1131: sysctl.
1132: Provided by the M2 scheduler.
1133: .It Li kern.sched.mints ( dynamic )
1134: Scheduler specific minimal time quantum (in milliseconds).
1135: Must be set to a value smaller than
1136: .Dq maxts
1137: and between 1 and
1.109 wiz 1138: .Dq hz
1.108 hubertf 1139: as given by the
1140: .Dq kern.clockrate
1141: sysctl.
1142: Provided by the M2 scheduler.
1143: .It Li kern.sched.name ( dynamic )
1.109 wiz 1144: Scheduler name.
1.108 hubertf 1145: Provided both by the M2 and the 4BSD scheduler.
1146: .It Li kern.sched.rtts ( dynamic )
1147: Fixed scheduler specific round-robin time quantum in milliseconds.
1148: Provided both by the M2 and the 4BSD scheduler.
1149: .It Li kern.sched.pri_min ( dynamic )
1150: Minimal POSIX real-time priority.
1151: See
1152: .Xr sched 3 .
1153: .It Li kern.sched.pri_max ( dynamic )
1154: Maximal POSIX real-time priority.
1155: See
1156: .Xr sched 3 .
1157: .El
1.91 kamil 1158: .It Li kern.somaxkva ( Dv KERN_SOMAXKVA )
1.1 pavel 1159: Maximum amount of kernel memory to be used for socket buffers.
1160: .\" XXX units?
1.91 kamil 1161: .It Li kern.synchronized_io ( Dv KERN_SYNCHRONIZED_IO )
1.58 wiz 1162: Returns 1 if the
1163: .St -p1003.1b-93
1164: Synchronized I/O Option is available on this system,
1.56 uwe 1165: otherwise\ 0.
1.19 christos 1166: .It Li kern.timecounter ( dynamic )
1167: Display and control the timecounter source of the system.
1.21 joerg 1168: .Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent
1.107 wiz 1169: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.19 christos 1170: .It kern.timecounter.choice string no
1171: .It kern.timecounter.hardware string yes
1172: .It kern.timecounter.timestepwarnings integer yes
1173: .El
1174: .Pp
1175: The variables are as follows:
1176: .Bl -tag -width "123456"
1177: .It Li kern.timecounter.choice ( dynamic )
1178: The list of available timecounters with their quality and frequency.
1179: .It Li kern.timecounter.hardware ( dynamic )
1180: The currently selected timecounter source.
1181: .It Li kern.timecounter.timestepwarnings ( dynamic )
1182: If non-zero display a message each time the time is stepped.
1183: .El
1.91 kamil 1184: .It Li kern.timex ( Dv KERN_TIMEX )
1.1 pavel 1185: Not available.
1.91 kamil 1186: .It Li kern.tkstat ( Dv KERN_TKSTAT )
1.1 pavel 1187: Return information about the number of characters sent and received
1188: on ttys.
1189: The third level names for the tty statistic variables are detailed below.
1190: The changeable column shows whether a process
1191: with appropriate privilege may change the value.
1.21 joerg 1192: .Bl -column "kern.tkstat.cancc" "quad" "Changeable" -offset indent
1.107 wiz 1193: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.1 pavel 1194: .It kern.tkstat.cancc quad no
1195: .It kern.tkstat.nin quad no
1196: .It kern.tkstat.nout quad no
1197: .It kern.tkstat.rawcc quad no
1198: .El
1199: .Pp
1200: The variables are as follows:
1201: .Bl -tag -width "123456"
1.91 kamil 1202: .It Li kern.tkstat.cancc ( Dv KERN_TKSTAT_CANCC )
1.1 pavel 1203: The number of canonical input characters.
1.91 kamil 1204: .It Li kern.tkstat.nin ( Dv KERN_TKSTAT_NIN )
1.1 pavel 1205: The total number of input characters.
1.91 kamil 1206: .It Li kern.tkstat.nout ( Dv KERN_TKSTAT_NOUT )
1.1 pavel 1207: The total number of output characters.
1.91 kamil 1208: .It Li kern.tkstat.rawcc ( Dv KERN_TKSTAT_RAWCC )
1.1 pavel 1209: The number of raw input characters.
1210: .El
1.66 christos 1211: .It Li kern.tty
1212: The third level names for the tty setup variables are detailed below.
1213: The changeable column shows whether a process
1214: with appropriate privilege may change the value.
1215: .Bl -column "kern.tty.qsize" "int" "Changeable" -offset indent
1.107 wiz 1216: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.66 christos 1217: .It kern.tty.qsize int yes
1218: .El
1219: .Pp
1220: The variables are as follows:
1221: .Bl -tag -width "123456"
1222: .It Li kern.tty.qsize
1223: Control/display the size of the default input and output queues selected
1224: during tty creation.
1225: Is converted to a power of two and its range is between
1226: .Dv 1024
1227: and
1228: .Dv 65536 .
1229: .El
1.70 christos 1230: .It Li kern.uidinfo
1231: Resource usage for the current user.
1232: .Bl -column "kern.uidinfo.proccnt" "integer" "Changeable" -offset indent
1.107 wiz 1233: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.70 christos 1234: .It kern.uidinfo.proccnt integer no
1235: .It kern.uidinfo.lwpcnt integer no
1236: .It kern.uidinfo.lockcnt integer no
1237: .It kern.uidinfo.sbsize integer no
1238: .El
1239: .Bl -tag -width "123456"
1240: .It Li kern.uidinfo.proccnt
1241: Returns the number of active processes for the current user.
1242: .It Li kern.uidinfo.lwpcnt
1243: Returns the number of active threads for the current user; the first thread
1244: of each process is not counted.
1245: .It Li kern.uidinfo.lockcnt
1246: Number of locks held by the current user.
1247: .It Li kern.uidinfo.sbsize
1248: Number of bytes in socket buffers allocated to the current user.
1249: .El
1.91 kamil 1250: .It Li kern.urandom ( Dv KERN_URND )
1.1 pavel 1251: Random integer value.
1.45 jruoho 1252: .It Li kern.usercrypto
1253: When enabled, allows userland to
1254: .Xr open 2
1255: the
1256: .Pa /dev/crypto
1257: special device, used by the
1258: .Xr crypto 4
1259: system.
1260: .It Li kern.userasymcrypto
1261: Enables or disables the use of software asymmetric crypto support in the
1262: .Xr crypto 4
1263: system.
1.1 pavel 1264: .It Li kern.veriexec
1.40 jruoho 1265: Runtime information for
1266: .Xr veriexec 8 .
1267: .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent
1.107 wiz 1268: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.40 jruoho 1269: .It kern.veriexec.algorithms string no
1270: .It kern.veriexec.count node not applicable
1271: .It kern.veriexec.strict integer yes
1272: .It kern.veriexec.verbose integer yes
1273: .El
1.1 pavel 1274: .Bl -tag -width "123456"
1275: .It Li kern.veriexec.algorithms
1276: Returns a string with the supported algorithms in Veriexec.
1277: .It Li kern.veriexec.count
1278: Sub-nodes are added to this node as new mounts are monitored by Veriexec.
1279: Each mount will be under its own
1280: .No tableN
1281: node.
1282: Under each node there will be three variables, indicating the mount
1.57 wiz 1283: point, the file system type, and the number of entries.
1.1 pavel 1284: .It Li kern.veriexec.strict
1285: Controls the strict level of Veriexec.
1286: See
1.62 jruoho 1287: .Xr security 7
1.1 pavel 1288: for more information on each level's implications.
1289: .It Li kern.veriexec.verbose
1290: Controls the verbosity level of Veriexec.
1291: If 0, only the minimal
1292: indication required will be given about what's happening - fingerprint
1293: mismatches, removal of entries from the tables, modification of a
1294: fingerprinted file.
1295: If 1, more messages will be printed (ie., when a file with a valid
1296: fingerprint is accessed).
1297: Verbose level 2 is debug mode.
1298: .El
1.91 kamil 1299: .It Li kern.version ( Dv KERN_VERSION )
1.1 pavel 1300: The system version string.
1.91 kamil 1301: .It Li kern.vnode ( Dv KERN_VNODE )
1.1 pavel 1302: Return the entire vnode table.
1303: Note, the vnode table is not necessarily a consistent snapshot of
1304: the system.
1305: The returned data consists of an array whose size depends on the
1306: current number of such objects in the system.
1307: Each element of the array contains the kernel address of a vnode
1.56 uwe 1308: .Vt struct vnode *
1.1 pavel 1309: followed by the vnode itself
1.56 uwe 1310: .Vt struct vnode .
1.43 jruoho 1311: .\" XXX: Undocumented: kern.lwp: no children?
1.1 pavel 1312: .El
1.50 jruoho 1313: .Ss The machdep.* subtree
1.1 pavel 1314: The set of variables defined is architecture dependent.
1315: Most architectures define at least the following variables.
1.43 jruoho 1316: .Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent
1.107 wiz 1317: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.43 jruoho 1318: .It Li machdep.booted_kernel string no
1.1 pavel 1319: .El
1.43 jruoho 1320: .\" XXX: Document the above.
1.50 jruoho 1321: .Ss The net.* subtree
1.1 pavel 1322: The string and integer information available for the
1323: .Li net
1324: level is detailed below.
1325: The changeable column shows whether a process with appropriate
1326: privilege may change the value.
1327: The second and third levels are typically the protocol family and
1328: protocol number, though this is not always the case.
1.21 joerg 1329: .Bl -column "Second level name" "IPsec key management values" "Changeable" -offset indent
1.107 wiz 1330: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.1 pavel 1331: .It net.route routing messages no
1332: .It net.inet IPv4 values yes
1333: .It net.inet6 IPv6 values yes
1334: .It net.key IPsec key management values yes
1335: .El
1336: .Bl -tag -width "123456"
1.91 kamil 1337: .It Li net.route ( Dv PF_ROUTE )
1.1 pavel 1338: .\" XXX really?
1339: Return the entire routing table or a subset of it.
1340: The data is returned as a sequence of routing messages (see
1341: .Xr route 4
1342: for the header file, format and meaning).
1343: The length of each message is contained in the message header.
1344: .Pp
1.56 uwe 1345: The third level name is a protocol number, which is currently always\ 0.
1.1 pavel 1346: The fourth level name is an address family, which may be set to 0 to
1347: select all address families.
1348: The fifth and sixth level names are as follows:
1.21 joerg 1349: .Bl -column "Fifth level name" "Sixth level is:" -offset indent
1.111 pgoyette 1350: .It Sy Fifth level name Ta Sy Sixth level is :
1.21 joerg 1351: .It NET_RT_FLAGS rtflags
1352: .It NET_RT_DUMP None
1353: .It NET_RT_IFLIST None
1.1 pavel 1354: .El
1.91 kamil 1355: .It Li net.inet ( Dv PF_INET )
1.1 pavel 1356: Get or set various global information about the IPv4
1357: .Pq Internet Protocol version 4 .
1358: The third level name is the protocol.
1359: The fourth level name is the variable name.
1360: The currently defined protocols and names are:
1.92 wiz 1361: .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
1.107 wiz 1362: .It Sy Protocol Variable Ta Sy Type Ta Sy Changeable
1.1 pavel 1363: .It arp down integer yes
1364: .It arp keep integer yes
1.65 christos 1365: .It arp log_movements integer yes
1366: .It arp log_permanent_modify integer yes
1.86 christos 1367: .It arp log_unknown_network integer yes
1.65 christos 1368: .It arp log_wrong_iface integer yes
1.1 pavel 1369: .It carp allow integer yes
1370: .It carp preempt integer yes
1371: .It carp log integer yes
1372: .It carp arpbalance integer yes
1373: .It icmp errppslimit integer yes
1374: .It icmp maskrepl integer yes
1375: .It icmp rediraccept integer yes
1376: .It icmp redirtimeout integer yes
1.28 christos 1377: .It icmp bmcastecho integer yes
1.1 pavel 1378: .It ip allowsrcrt integer yes
1.72 christos 1379: .It ip anonportalgo.selected string yes
1380: .It ip anonportalgo.available string yes
1.74 christos 1381: .It ip anonportalgo.reserve struct yes
1.1 pavel 1382: .It ip anonportmax integer yes
1383: .It ip anonportmin integer yes
1384: .It ip checkinterface integer yes
1.103 roy 1385: .It ip dad_count integer yes
1.1 pavel 1386: .It ip directed-broadcast integer yes
1387: .It ip do_loopback_cksum integer yes
1388: .It ip forwarding integer yes
1389: .It ip forwsrcrt integer yes
1390: .It ip gifttl integer yes
1391: .It ip grettl integer yes
1.8 liamjfoy 1392: .It ip hashsize integer yes
1.1 pavel 1393: .It ip hostzerobroadcast integer yes
1394: .It ip lowportmin integer yes
1395: .It ip lowportmax integer yes
1396: .It ip maxflows integer yes
1397: .It ip maxfragpackets integer yes
1398: .It ip mtudisc integer yes
1399: .It ip mtudisctimeout integer yes
1400: .It ip random_id integer yes
1401: .It ip redirect integer yes
1402: .It ip subnetsarelocal integer yes
1403: .It ip ttl integer yes
1404: .It tcp rfc1323 integer yes
1405: .It tcp sendspace integer yes
1406: .It tcp recvspace integer yes
1407: .It tcp mssdflt integer yes
1408: .It tcp syn_cache_limit integer yes
1409: .It tcp syn_bucket_limit integer yes
1410: .It tcp syn_cache_interval integer yes
1411: .It tcp init_win integer yes
1412: .It tcp init_win_local integer yes
1413: .It tcp mss_ifmtu integer yes
1414: .It tcp win_scale integer yes
1415: .It tcp timestamps integer yes
1416: .It tcp compat_42 integer yes
1417: .It tcp cwm integer yes
1418: .It tcp cwm_burstsize integer yes
1419: .It tcp ack_on_push integer yes
1420: .It tcp keepidle integer yes
1421: .It tcp keepintvl integer yes
1422: .It tcp keepcnt integer yes
1423: .It tcp slowhz integer no
1.12 christos 1424: .It tcp keepinit integer yes
1.1 pavel 1425: .It tcp log_refused integer yes
1426: .It tcp rstppslimit integer yes
1427: .It tcp ident struct no
1.13 christos 1428: .It tcp drop struct no
1.1 pavel 1429: .It tcp sack.enable integer yes
1430: .It tcp sack.globalholes integer no
1431: .It tcp sack.globalmaxholes integer yes
1432: .It tcp sack.maxholes integer yes
1433: .It tcp ecn.enable integer yes
1434: .It tcp ecn.maxretries integer yes
1435: .It tcp congctl.selected string yes
1436: .It tcp congctl.available string yes
1437: .It tcp abc.enable integer yes
1438: .It tcp abc.aggressive integer yes
1439: .It udp checksum integer yes
1440: .It udp do_loopback_cksum integer yes
1441: .It udp recvspace integer yes
1442: .It udp sendspace integer yes
1443: .El
1444: .Pp
1445: The variables are as follows:
1446: .Bl -tag -width "123456"
1447: .It Li arp.down
1448: Failed ARP entry lifetime.
1449: .It Li arp.keep
1450: Valid ARP entry lifetime.
1451: .It Li carp.allow
1452: If set to 0, incoming
1453: .Xr carp 4
1454: packets will not be processed.
1455: If set to any other value, processing will occur.
1456: Enabled by default.
1457: .It Li carp.arpbalance
1458: If set to any value other than 0, the ARP balancing functionality of
1459: .Xr carp 4
1460: is enabled.
1461: When ARP requests are received for an IP address which is part of any virtual
1462: host, carp will hash the source IP in the ARP request to select one of the
1463: virtual hosts from the set of all the virtual hosts which have that IP address.
1464: The master of that host will respond with the correct virtual MAC address.
1465: Disabled by default.
1466: .It Li carp.log
1467: If set to any value other than 0,
1468: .Xr carp 4
1469: will log errors.
1470: Disabled by default.
1471: .It Li carp.preempt
1472: If set to 0,
1473: .Xr carp 4
1474: will not attempt to become master if it is receiving advertisements from
1475: another active master.
1476: If set to any other value, carp will become master of the virtual host if it
1477: believes it can send advertisements more frequently than the current master.
1478: Disabled by default.
1479: .It Li ip.allowsrcrt
1480: If set to 1, the host accepts source routed packets.
1.72 christos 1481: .It Li ip.anonportalgo.available
1482: The available RFC 6056 port randomization algorithms.
1.74 christos 1483: .It Li ip.anonportalgo.reserve
1484: A bitmask of ports that will not be used during anonymous or privileged
1485: port selection.
1.72 christos 1486: .It Li ip.anonportalgo.selected
1487: The currently selected RFC 6056 port randomization algorithm.
1.1 pavel 1488: .It Li ip.anonportmax
1489: The highest port number to use for TCP and UDP ephemeral port allocation.
1490: This cannot be set to less than 1024 or greater than 65535, and must
1491: be greater than
1492: .Li ip.anonportmin .
1493: .It Li ip.anonportmin
1494: The lowest port number to use for TCP and UDP ephemeral port allocation.
1495: This cannot be set to less than 1024 or greater than 65535.
1496: .It Li ip.checkinterface
1497: If set to non-zero, the host will reject packets addressed to it
1498: that arrive on an interface not bound to that address.
1499: Currently, this must be disabled if ipnat is used to translate the
1500: destination address to another local interface, or if addresses
1501: are added to the loopback interface instead of the interface where
1502: the packets for those packets are received.
1.103 roy 1503: .It Li ip.dad_count
1504: The number of
1505: .Xr arp 4
1506: probes sent for Address Conflict Detection.
1507: Set to 0 to disable this.
1.1 pavel 1508: .It Li ip.directed-broadcast
1509: If set to 1, enables directed broadcast behavior for the host.
1510: .It Li ip.do_loopback_cksum
1511: Perform IP checksum on loopback.
1512: .It Li ip.forwarding
1513: If set to 1, enables IP forwarding for the host,
1514: meaning that the host is acting as a router.
1515: .It Li ip.forwsrcrt
1516: If set to 1, enables forwarding of source-routed packets for the host.
1517: This value may only be changed if the kernel security level is less than 1.
1518: .It Li ip.gifttl
1519: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1520: .Xr gif 4
1521: tunnel interface.
1522: .It Li ip.grettl
1523: The maximum time-to-live (hop count) value for an IPv4 packet generated by
1524: .Xr gre 4
1525: tunnel interface.
1.8 liamjfoy 1526: .It Li ip.hashsize
1527: The size of IPv4 Fast Forward hash table.
1528: This value must be a power of 2 (64, 256...).
1529: A larger hash table size results in fewer collisions.
1530: Also see
1531: .Li ip.maxflows .
1.1 pavel 1532: .It Li ip.hostzerobroadcast
1533: All zeroes address is broadcast address.
1534: .It Li ip.lowportmax
1535: The highest port number to use for TCP and UDP reserved port allocation.
1536: This cannot be set to less than 0 or greater than 1024, and must
1537: be greater than
1538: .Li ip.lowportmin .
1539: .It Li ip.lowportmin
1540: The lowest port number to use for TCP and UDP reserved port allocation.
1541: This cannot be set to less than 0 or greater than 1024, and must
1542: be smaller than
1543: .Li ip.lowportmax .
1544: .It Li ip.maxflows
1.5 liamjfoy 1545: IPv4 Fast Forwarding is enabled by default.
1546: If set to 0, IPv4 Fast Forwarding is disabled.
1.1 pavel 1547: .Li ip.maxflows
1548: controls the maximum amount of flows which can be created.
1549: The default value is 256.
1550: .It Li ip.maxfragpackets
1551: The maximum number of fragmented packets the node will accept.
1552: 0 means that the node will not accept any fragmented packets.
1553: \-1 means that the node will accept as many fragmented packets as it receives.
1554: The flag is provided basically for avoiding possible DoS attacks.
1555: .It Li ip.mtudisc
1556: If set to 1, enables Path MTU Discovery (RFC 1191).
1557: When Path MTU Discovery is enabled, the transmitted TCP segment
1558: size will be determined by the advertised maximum segment size
1559: (MSS) from the remote end, as constrained by the path MTU.
1560: If MTU Discovery is disabled, the transmitted segment size will
1561: never be greater than
1562: .Li tcp.mssdflt
1563: (the local maximum segment size).
1564: .It Li ip.mtudisctimeout
1565: The number of seconds in which a route added by the Path MTU
1566: Discovery engine will time out.
1567: When the route times out, the Path
1568: MTU Discovery engine will attempt to probe a larger path MTU.
1569: .It Li ip.random_id
1570: Assign random ip_id values.
1571: .It Li ip.redirect
1572: If set to 1, ICMP redirects may be sent by the host.
1573: This option is ignored unless the host is routing IP packets,
1574: and should normally be enabled on all systems.
1575: .It Li ip.subnetsarelocal
1576: If set to 1, subnets are to be considered local addresses.
1577: .It Li ip.ttl
1578: The maximum time-to-live (hop count) value for an IP packet sourced by
1579: the system.
1580: This value applies to normal transport protocols, not to ICMP.
1581: .It Li icmp.errppslimit
1582: The variable specifies the maximum number of outgoing ICMP error messages,
1583: per second.
1584: ICMP error messages that exceeded the value are subject to rate limitation
1585: and will not go out from the node.
1586: Negative value disables rate limitation.
1587: .It Li icmp.maskrepl
1588: If set to 1, ICMP network mask requests are to be answered.
1589: .It Li icmp.rediraccept
1590: If set to non-zero, the host will accept ICMP redirect packets.
1591: Note that routers will never accept ICMP redirect packets,
1592: and the variable is meaningful on IP hosts only.
1593: .It Li icmp.redirtimeout
1594: The variable specifies lifetime of routing entries generated by incoming
1595: ICMP redirect.
1596: This defaults to 600 seconds.
1597: .It Li icmp.returndatabytes
1598: Number of bytes to return in an ICMP error message.
1.28 christos 1599: .It Li icmp.bmcastecho
1600: If set to 1, enables responding to ICMP echo or timestamp request to the
1601: broadcast address.
1.1 pavel 1602: .It Li tcp.ack_on_push
1603: If set to 1, TCP is to immediately transmit an ACK upon reception of
1604: a packet with PUSH set.
1605: This can avoid losing a round trip time in some rare situations,
1606: but has the caveat of potentially defeating TCP's delayed ACK algorithm.
1607: Use of this option is generally not recommended, but
1608: the variable exists in case your configuration really needs it.
1609: .It Li tcp.compat_42
1610: If set to 1, enables work-arounds for bugs in the 4.2BSD TCP implementation.
1611: Use of this option is not recommended, although it may be
1612: required in order to communicate with extremely old TCP implementations.
1613: .It Li tcp.cwm
1614: If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window
1615: Monitoring algorithm.
1616: This algorithm prevents line-rate bursts of packets that could
1617: otherwise occur when data begins flowing on an idle TCP connection.
1618: These line-rate bursts can contribute to network and router congestion.
1619: This can be particularly useful on World Wide Web servers
1620: which support HTTP/1.1, which has lingering connections.
1621: .It Li tcp.cwm_burstsize
1622: The Congestion Window Monitoring allowed burst size, in terms
1623: of packet count.
1624: .It Li tcp.delack_ticks
1625: Number of ticks to delay sending an ACK.
1626: .It Li tcp.do_loopback_cksum
1627: Perform TCP checksum on loopback.
1628: .It Li tcp.init_win
1.76 wiz 1629: A value indicating the TCP initial congestion window.
1630: The valid range
1.87 matt 1631: is 0 to 10 (maximum specified by RFC6928),
1.75 christos 1632: with a default of 4 (approximately 4K per RFC3390).
1.1 pavel 1633: .It Li tcp.init_win_local
1634: Like
1635: .Li tcp.init_win ,
1636: but used when communicating with hosts on a local network.
1637: .It Li tcp.keepcnt
1638: Number of keepalive probes sent before declaring a connection dead.
1639: If set to zero, there is no limit;
1640: keepalives will be sent until some kind of
1641: response is received from the peer.
1642: .It Li tcp.keepidle
1643: Time a connection must be idle before keepalives are sent (if keepalives
1644: are enabled for the connection).
1645: See also tcp.slowhz.
1646: .It Li tcp.keepintvl
1647: Time after a keepalive probe is sent until, in the absence of any response,
1648: another probe is sent.
1649: See also tcp.slowhz.
1650: .It Li tcp.log_refused
1651: If set to 1, refused TCP connections to the host will be logged.
1.12 christos 1652: .It Li tcp.keepinit
1653: Timeout in seconds during connection establishment.
1.1 pavel 1654: .It Li tcp.mss_ifmtu
1655: If set to 1, TCP calculates the outgoing maximum segment size based on
1656: the MTU of the appropriate interface.
1657: If set to 0, it is calculated based on the greater of the MTU of the
1658: interface, and the largest (non-loopback) interface MTU on the system.
1659: .It Li tcp.mssdflt
1660: The default maximum segment size both advertised to the peer
1661: and to use when either the peer does not advertise a maximum segment size to
1662: us during connection setup or Path MTU Discovery
1663: .Li ( ip.mtudisc )
1664: is disabled.
1665: Do not change this value unless you really know what you are doing.
1666: .It Li tcp.recvspace
1667: The default TCP receive buffer size.
1668: .It Li tcp.rfc1323
1669: If set to 1, enables RFC 1323 extensions to TCP.
1670: .It Li tcp.rstppslimit
1671: The variable specifies the maximum number of outgoing TCP RST packets,
1672: per second.
1673: TCP RST packet that exceeded the value are subject to rate limitation
1674: and will not go out from the node.
1675: Negative value disables rate limitation.
1.13 christos 1676: .It Li tcp.ident
1677: Return the user ID of a connected socket pair.
1678: (RFC1413 Identification Protocol lookups.)
1679: .It Li tcp.drop
1680: Drop a TCP socket pair connection.
1.1 pavel 1681: .It Li tcp.sack.enable
1682: If set to 1, enables RFC 2018 Selective ACKnowledgement.
1683: .It Li tcp.sack.globalholes
1684: Global number of TCP SACK holes.
1685: .It Li tcp.sack.globalmaxholes
1686: Global maximum number of TCP SACK holes.
1687: .It Li tcp.sack.maxholes
1688: Maximum number of TCP SACK holes allowed per connection.
1689: .It Li tcp.ecn.enable
1690: If set to 1, enables RFC 3168 Explicit Congestion Notification.
1691: .It Li tcp.ecn.maxretries
1692: Number of times to retry sending the ECN-setup packet.
1693: .It Li tcp.sendspace
1694: The default TCP send buffer size.
1695: .It Li tcp.slowhz
1696: The units for tcp.keepidle and tcp.keepintvl; those variables are in ticks
1697: of a clock that ticks tcp.slowhz times per second.
1698: (That is, their values
1699: must be divided by the tcp.slowhz value to get times in seconds.)
1700: .It Li tcp.syn_bucket_limit
1701: The maximum number of entries allowed per hash bucket in the TCP
1702: compressed state engine.
1703: .It Li tcp.syn_cache_limit
1704: The maximum number of entries allowed in the TCP compressed state
1705: engine.
1706: .It Li tcp.timestamps
1707: If rfc1323 is enabled, a value of 1 indicates RFC 1323 time stamp options,
1708: used for measuring TCP round trip times, are enabled.
1709: .It Li tcp.win_scale
1710: If rfc1323 is enabled, a value of 1 indicates RFC 1323 window scale options,
1711: for increasing the TCP window size, are enabled.
1712: .It Li tcp.congctl.available
1713: The available TCP congestion control algorithms.
1714: .It Li tcp.congctl.selected
1715: The currently selected TCP congestion control algorithm.
1716: .It Li tcp.abc.enable
1717: If set to 1, use RFC 3465 Appropriate Byte Counting (ABC).
1718: If set to 0, use traditional Packet Counting.
1719: .It Li tcp.abc.aggressive
1720: Choose the L parameter found in RFC 3465.
1721: L is the maximum cwnd increase for an ack during slow start.
1722: If set to 1, use L=2*SMSS.
1723: If set to 0, use L=1*SMSS.
1724: It has no effect unless tcp.abc.enable is set to 1.
1725: .It Li udp.checksum
1726: If set to 1, UDP checksums are being computed.
1727: Received non-zero UDP checksums are always checked.
1728: Disabling UDP checksums is strongly discouraged.
1.67 christos 1729: .It Li udp.recvspace
1730: The default UDP receive buffer size.
1.1 pavel 1731: .It Li udp.sendspace
1732: The default UDP send buffer size.
1733: .El
1734: .Pp
1735: For variables net.*.ipsec, please refer to
1736: .Xr ipsec 4 .
1.91 kamil 1737: .It Li net.inet6 ( Dv PF_INET6 )
1.1 pavel 1738: Get or set various global information about the IPv6
1739: .Pq Internet Protocol version 6 .
1740: The third level name is the protocol.
1741: The fourth level name is the variable name.
1742: The currently defined protocols and names are:
1.92 wiz 1743: .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
1.107 wiz 1744: .It Sy Protocol Variable Ta Sy Type Ta Sy Changeable
1.1 pavel 1745: .It icmp6 errppslimit integer yes
1746: .It icmp6 mtudisc_hiwat integer yes
1747: .It icmp6 mtudisc_lowat integer yes
1748: .It icmp6 nd6_debug integer yes
1749: .It icmp6 nd6_delay integer yes
1750: .It icmp6 nd6_maxnudhint integer yes
1751: .It icmp6 nd6_mmaxtries integer yes
1752: .It icmp6 nd6_prune integer yes
1753: .It icmp6 nd6_umaxtries integer yes
1754: .It icmp6 nd6_useloopback integer yes
1755: .It icmp6 nodeinfo integer yes
1756: .It icmp6 rediraccept integer yes
1757: .It icmp6 redirtimeout integer yes
1758: .It ip6 accept_rtadv integer yes
1.96 christos 1759: .It ip6 addctlpolicy struct in6_addrpolicy no
1.72 christos 1760: .It ip6 anonportalgo.selected string yes
1761: .It ip6 anonportalgo.available string yes
1.90 kamil 1762: .It ip6 anonportalgo.reserve struct yes
1.1 pavel 1763: .It ip6 anonportmax integer yes
1764: .It ip6 anonportmin integer yes
1765: .It ip6 auto_flowlabel integer yes
1766: .It ip6 dad_count integer yes
1767: .It ip6 defmcasthlim integer yes
1768: .It ip6 forwarding integer yes
1769: .It ip6 gifhlim integer yes
1.7 liamjfoy 1770: .It ip6 hashsize integer yes
1.1 pavel 1771: .It ip6 hlim integer yes
1772: .It ip6 hdrnestlimit integer yes
1773: .It ip6 kame_version string no
1774: .It ip6 keepfaith integer yes
1775: .It ip6 log_interval integer yes
1776: .It ip6 lowportmax integer yes
1777: .It ip6 lowportmin integer yes
1.73 christos 1778: .It ip6 maxdynroutes integer yes
1779: .It ip6 maxifprefixes integer yes
1780: .It ip6 maxifdefrouters integer yes
1.5 liamjfoy 1781: .It ip6 maxflows integer yes
1.1 pavel 1782: .It ip6 maxfragpackets integer yes
1783: .It ip6 maxfrags integer yes
1.73 christos 1784: .It ip6 neighborgcthresh integer yes
1.1 pavel 1785: .It ip6 redirect integer yes
1786: .It ip6 rr_prune integer yes
1787: .It ip6 use_deprecated integer yes
1788: .It ip6 v6only integer yes
1789: .It udp6 do_loopback_cksum integer yes
1790: .It udp6 recvspace integer yes
1791: .It udp6 sendspace integer yes
1792: .El
1793: .Pp
1794: The variables are as follows:
1795: .Bl -tag -width "123456"
1796: .It Li ip6.accept_rtadv
1797: If set to non-zero, the node will accept ICMPv6 router advertisement packets
1798: and autoconfigures address prefixes and default routers.
1799: The node must be a host
1800: .Pq not a router
1801: for the option to be meaningful.
1.72 christos 1802: .It Li ip6.anonportalgo.available
1803: The available RFC 6056 port randomization algorithms.
1.74 christos 1804: .It Li ip6.anonportalgo.reserve
1805: A bitmask of ports that will not be used during anonymous or privileged
1806: port selection.
1.72 christos 1807: .It Li ip6.anonportalgo.selected
1808: The currently selected RFC 6056 port randomization algorithm.
1.1 pavel 1809: .It Li ip6.anonportmax
1810: The highest port number to use for TCP and UDP ephemeral port allocation.
1811: This cannot be set to less than 1024 or greater than 65535, and must
1812: be greater than
1813: .Li ip6.anonportmin .
1814: .It Li ip6.anonportmin
1815: The lowest port number to use for TCP and UDP ephemeral port allocation.
1816: This cannot be set to less than 1024 or greater than 65535.
1817: .It Li ip6.auto_flowlabel
1818: On connected transport protocol packets,
1819: fill IPv6 flowlabel field to help intermediate routers to identify packet flows.
1820: .It Li ip6.dad_count
1821: The variable configures number of IPv6 DAD
1822: .Pq duplicated address detection
1823: probe packets.
1824: The packets will be generated when IPv6 interface addresses are configured.
1825: .It Li ip6.defmcasthlim
1826: The default hop limit value for an IPv6 multicast packet sourced by the node.
1827: This value applies to all the transport protocols on top of IPv6.
1828: There are APIs to override the value, as documented in
1829: .Xr ip6 4 .
1830: .It Li ip6.forwarding
1831: If set to 1, enables IPv6 forwarding for the node,
1832: meaning that the node is acting as a router.
1833: If set to 0, disables IPv6 forwarding for the node,
1834: meaning that the node is acting as a host.
1835: IPv6 specification defines node behavior for
1836: .Dq router
1837: case and
1838: .Dq host
1839: case quite differently, and changing this variable during operation
1840: may cause serious trouble.
1841: It is recommended to configure the variable at bootstrap time,
1842: and bootstrap time only.
1843: .It Li ip6.gifhlim
1844: The maximum hop limit value for an IPv6 packet generated by
1845: .Xr gif 4
1846: tunnel interface.
1847: .It Li ip6.hdrnestlimit
1848: The number of IPv6 extension headers permitted on incoming IPv6 packets.
1849: If set to 0, the node will accept as many extension headers as possible.
1.7 liamjfoy 1850: .It Li ip6.hashsize
1851: The size of IPv6 Fast Forward hash table.
1.56 uwe 1852: This value must be a power of 2 (64, 256, ...).
1.7 liamjfoy 1853: A larger hash table size results in fewer collisions.
1854: Also see
1855: .Li ip6.maxflows .
1.1 pavel 1856: .It Li ip6.hlim
1857: The default hop limit value for an IPv6 unicast packet sourced by the node.
1858: This value applies to all the transport protocols on top of IPv6.
1859: There are APIs to override the value, as documented in
1860: .Xr ip6 4 .
1861: .It Li ip6.kame_version
1862: The string identifies the version of KAME IPv6 stack implemented in the kernel.
1863: .It Li ip6.keepfaith
1864: If set to non-zero, it enables
1865: .Dq FAITH
1866: TCP relay IPv6-to-IPv4 translator code in the kernel.
1867: Refer
1868: .Xr faith 4
1869: and
1870: .Xr faithd 8
1871: for detail.
1872: .It Li ip6.log_interval
1873: The variable controls amount of logs generated by IPv6 packet
1874: forwarding engine, by setting interval between log output
1875: .Pq in seconds .
1876: .It Li ip6.lowportmax
1877: The highest port number to use for TCP and UDP reserved port allocation.
1878: This cannot be set to less than 0 or greater than 1024, and must
1879: be greater than
1880: .Li ip6.lowportmin .
1881: .It Li ip6.lowportmin
1882: The lowest port number to use for TCP and UDP reserved port allocation.
1883: This cannot be set to less than 0 or greater than 1024, and must
1884: be smaller than
1885: .Li ip6.lowportmax .
1.73 christos 1886: .It Li ip6.maxdynroutes
1887: Maximum number of routes created by redirect.
1888: Set it to negative to disable.
1889: The default value is 4096.
1890: .It Li ip6.maxifprefixes
1891: Maximum number of prefixes created by route advertisements per interface.
1892: Set it to negative to disable.
1893: The default value is 16.
1894: .It Li ip6.maxifdefrouters 16
1895: Maximum number of default routers created by route advertisements per interface.
1896: Set it to negative to disable.
1897: The default value is 16.
1.5 liamjfoy 1898: .It Li ip6.maxflows
1899: IPv6 Fast Forwarding is enabled by default.
1900: If set to 0, IPv6 Fast Forwarding is disabled.
1901: .Li ip6.maxflows
1902: controls the maximum amount of flows which can be created.
1.6 liamjfoy 1903: The default value is 256.
1.1 pavel 1904: .It Li ip6.maxfragpackets
1905: The maximum number of fragmented packets the node will accept.
1906: 0 means that the node will not accept any fragmented packets.
1907: \-1 means that the node will accept as many fragmented packets as it receives.
1908: The flag is provided basically for avoiding possible DoS attacks.
1909: .It Li ip6.maxfrags
1910: The maximum number of fragments the node will accept.
1911: 0 means that the node will not accept any fragments.
1912: \-1 means that the node will accept as many fragments as it receives.
1913: The flag is provided basically for avoiding possible DoS attacks.
1.73 christos 1914: .It Li ip6.neighborgcthresh
1.98 ozaki-r 1915: Maximum number of entries in neighbor cache per interface.
1.73 christos 1916: Set to negative to disable.
1917: The default value is 2048.
1.1 pavel 1918: .It Li ip6.redirect
1919: If set to 1, ICMPv6 redirects may be sent by the node.
1920: This option is ignored unless the node is routing IP packets,
1921: and should normally be enabled on all systems.
1922: .It Li ip6.rr_prune
1923: The variable specifies interval between IPv6 router renumbering prefix
1924: babysitting, in seconds.
1925: .It Li ip6.use_deprecated
1926: The variable controls use of deprecated address, specified in RFC 2462 5.5.4.
1927: .It Li ip6.v6only
1928: The variable specifies initial value for
1929: .Dv IPV6_V6ONLY
1930: socket option for
1931: .Dv AF_INET6
1932: socket.
1933: Please refer to
1934: .Xr ip6 4
1935: for detail.
1936: .It Li icmp6.errppslimit
1937: The variable specifies the maximum number of outgoing ICMPv6 error messages,
1938: per second.
1939: ICMPv6 error messages that exceeded the value are subject to rate limitation
1940: and will not go out from the node.
1941: Negative value disables rate limitation.
1942: .It Li icmp6.mtudisc_hiwat
1943: .It Li icmp6.mtudisc_lowat
1944: The variables define the maximum number of routing table entries,
1945: created due to path MTU discovery
1946: .Pq prevents denial-of-service attacks with ICMPv6 too big messages .
1947: When IPv6 path MTU discovery happens, we keep path MTU information into
1948: the routing table.
1949: If the number of routing table entries exceed the value,
1950: the kernel will not attempt to keep the path MTU information.
1951: .Li icmp6.mtudisc_hiwat
1952: is used when we have verified ICMPv6 too big messages.
1953: .Li icmp6.mtudisc_lowat
1954: is used when we have unverified ICMPv6 too big messages.
1955: Verification is performed by using address/port pairs kept in connected pcbs.
1956: Negative value disables the upper limit.
1957: .It Li icmp6.nd6_debug
1958: If set to non-zero, kernel IPv6 neighbor discovery code will generate
1959: debugging messages.
1960: The debug outputs are useful to diagnose IPv6 interoperability issues.
1961: The flag must be set to 0 for normal operation.
1962: .It Li icmp6.nd6_delay
1963: The variable specifies
1964: .Dv DELAY_FIRST_PROBE_TIME
1965: timing constant in IPv6 neighbor discovery specification
1966: .Pq RFC 2461 ,
1967: in seconds.
1968: .It Li icmp6.nd6_maxnudhint
1969: IPv6 neighbor discovery permits upper layer protocols to supply reachability
1970: hints, to avoid unnecessary neighbor discovery exchanges.
1971: The variable defines the number of consecutive hints the neighbor discovery
1972: layer will take.
1973: For example, by setting the variable to 3, neighbor discovery layer
1974: will take 3 consecutive hints in maximum.
1975: After receiving 3 hints, neighbor discovery layer will perform
1976: normal neighbor discovery process.
1977: .It Li icmp6.nd6_mmaxtries
1978: The variable specifies
1979: .Dv MAX_MULTICAST_SOLICIT
1980: constant in IPv6 neighbor discovery specification
1981: .Pq RFC 2461 .
1982: .It Li icmp6.nd6_prune
1983: The variable specifies interval between IPv6 neighbor cache babysitting,
1984: in seconds.
1985: .It Li icmp6.nd6_umaxtries
1986: The variable specifies
1987: .Dv MAX_UNICAST_SOLICIT
1988: constant in IPv6 neighbor discovery specification
1989: .Pq RFC 2461 .
1990: .It Li icmp6.nd6_useloopback
1991: If set to non-zero, kernel IPv6 stack will use loopback interface for
1992: local traffic.
1993: .It Li icmp6.nodeinfo
1994: The variable enables responses to ICMPv6 node information queries.
1995: If you set the variable to 0, responses will not be generated for
1996: ICMPv6 node information queries.
1997: Since node information queries can have a security impact, it is
1998: possible to fine tune which responses should be answered.
1999: Two separate bits can be set.
2000: .Bl -tag -width "12345"
2001: .It 1
2002: Respond to ICMPv6 FQDN queries, e.g.
2003: .Li ping6 -w .
2004: .It 2
2005: Respond to ICMPv6 node addresses queries, e.g.
2006: .Li ping6 -a .
2007: .El
2008: .It Li icmp6.rediraccept
2009: If set to non-zero, the host will accept ICMPv6 redirect packets.
2010: Note that IPv6 routers will never accept ICMPv6 redirect packets,
2011: and the variable is meaningful on IPv6 hosts
2012: .Pq non-router
2013: only.
2014: .It Li icmp6.redirtimeout
2015: The variable specifies lifetime of routing entries generated by incoming
2016: ICMPv6 redirect.
2017: .It Li udp6.do_loopback_cksum
2018: Perform UDP checksum on loopback.
2019: .It Li udp6.recvspace
2020: Default UDP receive buffer size.
2021: .It Li udp6.sendspace
2022: Default UDP send buffer size.
2023: .El
2024: .Pp
2025: We reuse net.*.tcp for
2026: .Tn TCP
2027: over
2028: .Tn IPv6 ,
2029: and therefore we do not have variables net.*.tcp6.
2030: Variables net.inet6.udp6 have identical meaning to net.inet.udp.
2031: Please refer to
2032: .Li PF_INET
2033: section above.
2034: For variables net.*.ipsec6, please refer to
2035: .Xr ipsec 4 .
1.91 kamil 2036: .It Li net.key ( Dv PF_KEY )
1.1 pavel 2037: Get or set various global information about the IPsec key management.
2038: The third level name is the variable name.
2039: The currently defined variable and names are:
1.21 joerg 2040: .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
1.107 wiz 2041: .It Sy Variable Type Ta Sy Changeable
1.1 pavel 2042: .It debug integer yes
1.80 christos 2043: .It enabled integer yes
2044: .It used integer no
1.1 pavel 2045: .It spi_try integer yes
2046: .It spi_min_value integer yes
2047: .It spi_max_value integer yes
2048: .It larval_lifetime integer yes
2049: .It blockacq_count integer yes
2050: .It blockacq_lifetime integer yes
2051: .It esp_keymin integer yes
2052: .It esp_auth integer yes
2053: .It ah_keymin integer yes
2054: .El
1.21 joerg 2055: .Pp
1.1 pavel 2056: The variables are as follows:
2057: .Bl -tag -width "123456"
2058: .It Li debug
2059: Turn on debugging message from within the kernel.
2060: The value is a bitmap, as defined in
1.56 uwe 2061: .In netkey/key_debug.h .
1.80 christos 2062: .It Li enabled
1.81 christos 2063: Control processing of IPsec control messages.
2064: .Bl -tag -width indent
2065: .It 0
2066: Never allow IPsec processing
2067: .It 1
2068: Allow IPsec processing when SPD policies are present.
2069: .It 2
2070: Force IPsec processing even when SPD policies are not present.
2071: .El
1.80 christos 2072: .It Li used
2073: Based on if IPsec is enabled, and SPD rule existance, show if
2074: IPsec is being used.
1.110 abhinav 2075: Note that currently once IPsec is being used, it cannot be disabled.
1.1 pavel 2076: .It Li spi_try
2077: The number of times the kernel will try to obtain an unique SPI
2078: when it generates it from random number generator.
2079: .It Li spi_min_value
2080: Minimum SPI value when generating it within the kernel.
2081: .It Li spi_max_value
2082: Maximum SPI value when generating it within the kernel.
2083: .It Li larval_lifetime
2084: Lifetime for LARVAL SAD entries, in seconds.
2085: .It Li blockacq_count
2086: Number of ACQUIRE PF_KEY messages to be blocked after an ACQUIRE message.
2087: It avoids flood of ACQUIRE PF_KEY from being sent from the kernel to the
2088: key management daemon.
2089: .It Li blockacq_lifetime
2090: Lifetime of ACQUIRE PF_KEY message.
2091: .It Li esp_keymin
2092: Minimum ESP key length, in bits.
2093: The value is used when the kernel creates proposal payload
2094: on ACQUIRE PF_KEY message.
2095: .It Li esp_auth
2096: Whether ESP authentication should be used or not.
2097: Non-zero value indicates that ESP authentication should be used.
2098: The value is used when the kernel creates proposal payload
2099: on ACQUIRE PF_KEY message.
2100: .It Li ah_keymin
2101: Minimum AH key length, in bits,
2102: The value is used when the kernel creates proposal payload
2103: on ACQUIRE PF_KEY message.
2104: .El
2105: .El
1.50 jruoho 2106: .Ss The proc.* subtree
1.1 pavel 2107: The string and integer information available for the
2108: .Li proc
2109: level is detailed below.
2110: The changeable column shows whether a process with appropriate
2111: privilege may change the value.
2112: These values are per-process,
2113: and as such may change from one process to another.
2114: When a process is created,
2115: the default values are inherited from its parent.
2116: When a set-user-ID or set-group-ID binary is executed, the
2117: value of PROC_PID_CORENAME is reset to the system default value.
2118: The second level name is either the magic value PROC_CURPROC, which
2119: points to the current process, or the PID of the target process.
1.21 joerg 2120: .Bl -column "proc.pid.corename" "string" "not applicable" -offset indent
1.107 wiz 2121: .It Sy Third level name Ta Sy Type Ta Sy Changeable
1.1 pavel 2122: .It proc.pid.corename string yes
2123: .It proc.pid.rlimit node not applicable
2124: .It proc.pid.stopfork int yes
2125: .It proc.pid.stopexec int yes
2126: .It proc.pid.stopexit int yes
1.111 pgoyette 2127: .It proc.pid.paxflags int no
1.1 pavel 2128: .El
2129: .Bl -tag -width "123456"
1.91 kamil 2130: .It Li proc.pid.corename ( Dv PROC_PID_CORENAME )
1.1 pavel 2131: The template used for the core dump file name (see
2132: .Xr core 5
2133: for details).
2134: The base name must either be
1.56 uwe 2135: .Pa core
2136: or end with the suffix
2137: .Pa .core
2138: (the super-user may set arbitrary names).
2139: By default it points to
2140: .Dv KERN_DEFCORENAME .
1.91 kamil 2141: .It Li proc.pid.rlimit ( Dv PROC_PID_LIMIT )
1.1 pavel 2142: Return resources limits, as defined for the
2143: .Xr getrlimit 2
2144: and
2145: .Xr setrlimit 2
2146: system calls.
2147: The fourth level name is one of:
1.56 uwe 2148: .Bl -tag -width "123456"
1.91 kamil 2149: .It Li proc.pid.rlimit.cputime ( Dv PROC_PID_LIMIT_CPU )
1.1 pavel 2150: The maximum amount of CPU time (in seconds) to be used by each process.
1.91 kamil 2151: .It Li proc.pid.rlimit.filesize ( Dv PROC_PID_LIMIT_FSIZE )
1.1 pavel 2152: The largest size (in bytes) file that may be created.
1.91 kamil 2153: .It Li proc.pid.rlimit.datasize ( Dv PROC_PID_LIMIT_DATA )
1.1 pavel 2154: The maximum size (in bytes) of the data segment for a process;
2155: this defines how far a program may extend its break with the
2156: .Xr sbrk 2
2157: system call.
1.91 kamil 2158: .It Li proc.pid.rlimit.stacksize ( Dv PROC_PID_LIMIT_STACK )
1.1 pavel 2159: The maximum size (in bytes) of the stack segment for a process;
2160: this defines how far a program's stack segment may be extended.
2161: Stack extension is performed automatically by the system.
1.91 kamil 2162: .It Li proc.pid.rlimit.coredumpsize ( Dv PROC_PID_LIMIT_CORE )
1.1 pavel 2163: The largest size (in bytes)
2164: .Pa core
2165: file that may be created.
1.91 kamil 2166: .It Li proc.pid.rlimit.memoryuse ( Dv PROC_PID_LIMIT_RSS )
1.1 pavel 2167: The maximum size (in bytes) to which a process's resident set size may
2168: grow.
2169: This imposes a limit on the amount of physical memory to be given to
2170: a process; if memory is tight, the system will prefer to take memory
2171: from processes that are exceeding their declared resident set size.
1.91 kamil 2172: .It Li proc.pid.rlimit.memorylocked ( Dv PROC_PID_LIMIT_MEMLOCK )
1.1 pavel 2173: The maximum size (in bytes) which a process may lock into memory
2174: using the
2175: .Xr mlock 2
2176: function.
1.91 kamil 2177: .It Li proc.pid.rlimit.maxproc ( Dv PROC_PID_LIMIT_NPROC )
1.1 pavel 2178: The maximum number of simultaneous processes for this user id.
1.91 kamil 2179: .It Li proc.pid.rlimit.descriptors ( Dv PROC_PID_LIMIT_NOFILE )
1.1 pavel 2180: The maximum number of open files for this process.
1.91 kamil 2181: .It Li proc.pid.rlimit.sbsize ( Dv PROC_PID_LIMIT_SBSIZE )
1.22 snj 2182: The maximum size (in bytes) of the socket buffers
2183: set by the
2184: .Xr setsockopt 2
2185: .Dv SO_RCVBUF
2186: and
2187: .Dv SO_SNDBUF
2188: options.
1.91 kamil 2189: .It Li proc.pid.rlimit.vmemoryuse ( Dv PROC_PID_LIMIT_AS )
1.88 kamil 2190: The maximum size (in bytes) which a process can obtain.
1.91 kamil 2191: .It Li proc.pid.rlimit.maxlwp ( Dv PROC_PID_LIMIT_NTHR )
1.88 kamil 2192: The maximum number of threads that cen be created and running at one time in
2193: the process.
2194: The first thread of each process is not counted against this.
1.1 pavel 2195: .El
2196: .Pp
2197: The fifth level name is one of
1.91 kamil 2198: .Li soft ( Dv PROC_PID_LIMIT_TYPE_SOFT )
1.56 uwe 2199: or
1.91 kamil 2200: .Li hard ( Dv PROC_PID_LIMIT_TYPE_HARD ) ,
1.1 pavel 2201: to select respectively the soft or hard limit.
2202: Both are of type integer.
1.91 kamil 2203: .It Li proc.pid.stopfork ( Dv PROC_PID_STOPFORK )
1.1 pavel 2204: If non zero, the process' children will be stopped after
2205: .Xr fork 2
2206: calls.
1.112 pgoyette 2207: The children are created in the SSTOP state and are never scheduled
1.1 pavel 2208: for running before being stopped.
1.113 ! pgoyette 2209: This feature enables attaching to a process with a debugger such as
1.1 pavel 2210: .Xr gdb 1
1.113 ! pgoyette 2211: before the process has the opportunity to actually do anything.
1.1 pavel 2212: .Pp
2213: This value is inherited by the process's children, and it also
1.112 pgoyette 2214: applies to emulation specific system calls that fork a new process, such as
1.1 pavel 2215: .Fn sproc
2216: or
2217: .Fn clone .
1.91 kamil 2218: .It Li proc.pid.stopexec ( Dv PROC_PID_STOPEXEC )
1.112 pgoyette 2219: If non zero, the process will be stopped on the next
1.1 pavel 2220: .Xr exec 3
2221: call.
2222: The process created by
2223: .Xr exec 3
2224: is created in the SSTOP state and is never scheduled for running
2225: before being stopped.
1.112 pgoyette 2226: This feature enables attaching to a process with a debugger such as
1.1 pavel 2227: .Xr gdb 1
1.113 ! pgoyette 2228: before the process has the opportunity to actually do anything.
1.1 pavel 2229: .Pp
2230: This value is inherited by the process's children.
1.91 kamil 2231: .It Li proc.pid.stopexit ( Dv PROC_PID_STOPEXIT )
1.112 pgoyette 2232: If non zero, the process will be stopped when it has cause to exit,
1.1 pavel 2233: either by way of calling
2234: .Xr exit 3 ,
2235: .Xr _exit 2 ,
2236: or by the receipt of a specific signal.
2237: The process is stopped before any of its resources or vm space is
1.112 pgoyette 2238: released allowing examination of the termination state of the process
1.1 pavel 2239: before it disappears.
2240: This feature can be used to examine the final conditions of the
2241: process's vmspace via
2242: .Xr pmap 1
2243: or its resource settings with
2244: .Xr sysctl 8
2245: before it disappears.
2246: .Pp
2247: This value is also inherited by the process's children.
1.111 pgoyette 2248: .It Li proc.pid.paxflags ( Dv PROC_PID_PAXFLAGS )
2249: This read-only variable returns the current value of the process's pax
2250: flags (see
2251: .Xr paxctl 8 ) .
1.1 pavel 2252: .El
1.91 kamil 2253: .Ss The user.* subtree ( Dv CTL_USER )
1.1 pavel 2254: The string and integer information available for the
2255: .Li user
2256: level is detailed below.
2257: The changeable column shows whether a process with appropriate
2258: privilege may change the value.
1.21 joerg 2259: .Bl -column "user.coll_weights_max" "integer" "Changeable" -offset indent
1.107 wiz 2260: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.1 pavel 2261: .It user.atexit_max integer no
2262: .It user.bc_base_max integer no
2263: .It user.bc_dim_max integer no
2264: .It user.bc_scale_max integer no
2265: .It user.bc_string_max integer no
2266: .It user.coll_weights_max integer no
2267: .It user.cs_path string no
2268: .It user.expr_nest_max integer no
2269: .It user.line_max integer no
2270: .It user.posix2_c_bind integer no
2271: .It user.posix2_c_dev integer no
2272: .It user.posix2_char_term integer no
2273: .It user.posix2_fort_dev integer no
2274: .It user.posix2_fort_run integer no
2275: .It user.posix2_localedef integer no
2276: .It user.posix2_sw_dev integer no
2277: .It user.posix2_upe integer no
2278: .It user.posix2_version integer no
2279: .It user.re_dup_max integer no
2280: .It user.stream_max integer no
2281: .It user.stream_max integer no
2282: .It user.tzname_max integer no
2283: .El
2284: .Bl -tag -width "123456"
1.91 kamil 2285: .It Li user.atexit_max ( Dv USER_ATEXIT_MAX )
1.1 pavel 2286: The maximum number of functions that may be registered with
2287: .Xr atexit 3 .
1.91 kamil 2288: .It Li user.bc_base_max ( Dv USER_BC_BASE_MAX )
1.1 pavel 2289: The maximum ibase/obase values in the
2290: .Xr bc 1
2291: utility.
1.91 kamil 2292: .It Li user.bc_dim_max ( Dv USER_BC_DIM_MAX )
1.1 pavel 2293: The maximum array size in the
2294: .Xr bc 1
2295: utility.
1.91 kamil 2296: .It Li user.bc_scale_max ( Dv USER_BC_SCALE_MAX )
1.1 pavel 2297: The maximum scale value in the
2298: .Xr bc 1
2299: utility.
1.91 kamil 2300: .It Li user.bc_string_max ( Dv USER_BC_STRING_MAX )
1.1 pavel 2301: The maximum string length in the
2302: .Xr bc 1
2303: utility.
1.91 kamil 2304: .It Li user.coll_weights_max ( Dv USER_COLL_WEIGHTS_MAX )
1.1 pavel 2305: The maximum number of weights that can be assigned to any entry of
2306: the LC_COLLATE order keyword in the locale definition file.
2307: .It Li user.cs_path ( USER_CS_PATH )
2308: Return a value for the
2309: .Ev PATH
2310: environment variable that finds all the standard utilities.
1.91 kamil 2311: .It Li user.expr_nest_max ( Dv USER_EXPR_NEST_MAX )
1.1 pavel 2312: The maximum number of expressions that can be nested within
2313: parenthesis by the
2314: .Xr expr 1
2315: utility.
1.91 kamil 2316: .It Li user.line_max ( Dv USER_LINE_MAX )
1.1 pavel 2317: The maximum length in bytes of a text-processing utility's input
2318: line.
1.91 kamil 2319: .It Li user.posix2_char_term ( Dv USER_POSIX2_CHAR_TERM )
1.1 pavel 2320: Return 1 if the system supports at least one terminal type capable of
1.58 wiz 2321: all operations described in
2322: .St -p1003.2 ,
2323: otherwise\ 0.
1.91 kamil 2324: .It Li user.posix2_c_bind ( Dv USER_POSIX2_C_BIND )
1.1 pavel 2325: Return 1 if the system's C-language development facilities support the
1.56 uwe 2326: C-Language Bindings Option, otherwise\ 0.
1.91 kamil 2327: .It Li user.posix2_c_dev ( Dv USER_POSIX2_C_DEV )
1.1 pavel 2328: Return 1 if the system supports the C-Language Development Utilities Option,
1.56 uwe 2329: otherwise\ 0.
1.91 kamil 2330: .It Li user.posix2_fort_dev ( Dv USER_POSIX2_FORT_DEV )
1.1 pavel 2331: Return 1 if the system supports the FORTRAN Development Utilities Option,
1.56 uwe 2332: otherwise\ 0.
1.91 kamil 2333: .It Li user.posix2_fort_run ( Dv USER_POSIX2_FORT_RUN )
1.1 pavel 2334: Return 1 if the system supports the FORTRAN Runtime Utilities Option,
1.56 uwe 2335: otherwise\ 0.
1.91 kamil 2336: .It Li user.posix2_localedef ( Dv USER_POSIX2_LOCALEDEF )
1.56 uwe 2337: Return 1 if the system supports the creation of locales, otherwise\ 0.
1.91 kamil 2338: .It Li user.posix2_sw_dev ( Dv USER_POSIX2_SW_DEV )
1.1 pavel 2339: Return 1 if the system supports the Software Development Utilities Option,
1.56 uwe 2340: otherwise\ 0.
1.91 kamil 2341: .It Li user.posix2_upe ( Dv USER_POSIX2_UPE )
1.1 pavel 2342: Return 1 if the system supports the User Portability Utilities Option,
1.56 uwe 2343: otherwise\ 0.
1.91 kamil 2344: .It Li user.posix2_version ( Dv USER_POSIX2_VERSION )
1.58 wiz 2345: The version of
2346: .St -p1003.2
2347: with which the system attempts to comply.
1.91 kamil 2348: .It Li user.re_dup_max ( Dv USER_RE_DUP_MAX )
1.1 pavel 2349: The maximum number of repeated occurrences of a regular expression
2350: permitted when using interval notation.
1.91 kamil 2351: .It Li user.stream_max ( Dv USER_STREAM_MAX )
1.1 pavel 2352: The minimum maximum number of streams that a process may have open
2353: at any one time.
1.91 kamil 2354: .It Li user.tzname_max ( Dv USER_TZNAME_MAX )
1.1 pavel 2355: The minimum maximum number of types supported for the name of a
2356: timezone.
2357: .El
1.91 kamil 2358: .Ss The vm.* subtree ( Dv CTL_VM )
1.1 pavel 2359: The string and integer information available for the
2360: .Li vm
2361: level is detailed below.
2362: The changeable column shows whether a process with appropriate
2363: privilege may change the value.
1.21 joerg 2364: .Bl -column "Second level name" "struct uvmexp_sysctl" "Changeable" -offset indent
1.107 wiz 2365: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.1 pavel 2366: .It vm.anonmax int yes
2367: .It vm.anonmin int yes
2368: .It vm.bufcache int yes
2369: .It vm.bufmem int no
2370: .It vm.bufmem_hiwater int yes
2371: .It vm.bufmem_lowater int yes
2372: .It vm.execmax int yes
2373: .It vm.execmin int yes
2374: .It vm.filemax int yes
2375: .It vm.filemin int yes
2376: .It vm.loadavg struct loadavg no
2377: .It vm.maxslp int no
2378: .It vm.nkmempages int no
2379: .It vm.uspace int no
2380: .It vm.uvmexp struct uvmexp no
2381: .It vm.uvmexp2 struct uvmexp_sysctl no
2382: .It vm.vmmeter struct vmtotal no
1.93 christos 2383: .It vm.proc.map struct kinfo_vmentry no
1.1 pavel 2384: .El
2385: .Bl -tag -width "123456"
1.91 kamil 2386: .It Li vm.anonmax ( Dv VM_ANONMAX )
1.1 pavel 2387: The percentage of physical memory which will be reclaimed
2388: from other types of memory usage to store anonymous application data.
1.91 kamil 2389: .It Li vm.anonmin ( Dv VM_ANONMIN )
1.1 pavel 2390: The percentage of physical memory which will be always be available for
2391: anonymous application data.
1.91 kamil 2392: .It Li vm.bufcache ( Dv VM_BUFCACHE )
1.1 pavel 2393: The percentage of physical memory which will be available
2394: for the buffer cache.
1.91 kamil 2395: .It Li vm.bufmem ( Dv VM_BUFMEM )
1.1 pavel 2396: The amount of kernel memory that is being used by the buffer cache.
1.91 kamil 2397: .It Li vm.bufmem_lowater ( Dv VM_BUFMEM_LOWATER )
1.1 pavel 2398: The minimum amount of kernel memory to reserve for the
2399: buffer cache.
1.91 kamil 2400: .It Li vm.bufmem_hiwater ( Dv VM_BUFMEM_HIWATER )
1.1 pavel 2401: The maximum amount of kernel memory to be used for the
2402: buffer cache.
1.91 kamil 2403: .It Li vm.execmax ( Dv VM_EXECMAX )
1.1 pavel 2404: The percentage of physical memory which will be reclaimed
2405: from other types of memory usage to store cached executable data.
1.91 kamil 2406: .It Li vm.execmin ( Dv VM_EXECMIN )
1.1 pavel 2407: The percentage of physical memory which will be always be available for
2408: cached executable data.
1.91 kamil 2409: .It Li vm.filemax ( Dv VM_FILEMAX )
1.1 pavel 2410: The percentage of physical memory which will be reclaimed
2411: from other types of memory usage to store cached file data.
1.91 kamil 2412: .It Li vm.filemin ( Dv VM_FILEMIN )
1.1 pavel 2413: The percentage of physical memory which will be always be available for
2414: cached file data.
1.91 kamil 2415: .It Li vm.loadavg ( Dv VM_LOADAVG )
1.1 pavel 2416: Return the load average history.
2417: The returned data consists of a
1.56 uwe 2418: .Vt struct loadavg .
1.91 kamil 2419: .It Li vm.maxslp ( Dv VM_MAXSLP )
1.1 pavel 2420: The value of the maxslp kernel global variable.
1.91 kamil 2421: .It Li vm.vmmeter ( Dv VM_METER )
1.1 pavel 2422: Return system wide virtual memory statistics.
2423: The returned data consists of a
1.56 uwe 2424: .Vt struct vmtotal .
1.31 drochner 2425: .It vm.user_va0_disable
1.56 uwe 2426: A flag which controls whether user processes can map virtual address\ 0.
1.93 christos 2427: .It Li vm.proc.map ( Dv VM_PROC )
1.94 wiz 2428: The third level is
1.93 christos 2429: .dv VM_PROC_MAP ,
2430: the fourth is the pid of the process to display the vm object entries for, and
2431: the fifth is the size of
2432: .Vt struct kinfo_vmentry .
2433: Returns an array of
2434: .Vt struct kinfo_vmentry
2435: objects.
1.91 kamil 2436: .It Li vm.uspace ( Dv VM_USPACE )
1.1 pavel 2437: The number of bytes allocated for each kernel stack.
1.91 kamil 2438: .It Li vm.uvmexp ( Dv VM_UVMEXP )
1.1 pavel 2439: Return system wide virtual memory statistics.
2440: The returned data consists of a
1.56 uwe 2441: .Vt struct uvmexp .
1.91 kamil 2442: .It Li vm.uvmexp2 ( Dv VM_UVMEXP2 )
1.1 pavel 2443: Return system wide virtual memory statistics.
2444: The returned data consists of a
1.56 uwe 2445: .Vt struct uvmexp_sysctl .
1.1 pavel 2446: .\" XXX vm.idlezero
2447: .El
1.91 kamil 2448: .Ss The ddb.* subtree ( Dv CTL_DDB )
1.34 jruoho 2449: The information available for the
1.1 pavel 2450: .Li ddb
2451: level is detailed below.
2452: The changeable column shows whether a process with appropriate
2453: privilege may change the value.
2454: .\" XXX sort
1.21 joerg 2455: .Bl -column "Second level name" "integer" "Changeable" -offset indent
1.107 wiz 2456: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.1 pavel 2457: .It ddb.radix integer yes
2458: .It ddb.maxoff integer yes
1.34 jruoho 2459: .It ddb.maxwidth integer yes
1.1 pavel 2460: .It ddb.lines integer yes
2461: .It ddb.tabstops integer yes
2462: .It ddb.onpanic integer yes
2463: .It ddb.fromconsole integer yes
1.34 jruoho 2464: .It ddb.tee_msgbuf integer yes
2465: .It ddb.commandonenter string yes
1.1 pavel 2466: .El
2467: .Bl -tag -width "123456"
1.91 kamil 2468: .It Li ddb.radix ( Dv DDBCTL_RADIX )
1.1 pavel 2469: The input and output radix.
1.91 kamil 2470: .It Li ddb.maxoff ( Dv DDBCTL_MAXOFF )
1.1 pavel 2471: The maximum symbol offset.
1.91 kamil 2472: .It Li ddb.maxwidth ( Dv DDBCTL_MAXWIDTH )
1.34 jruoho 2473: The maximum output line width.
1.91 kamil 2474: .It Li ddb.lines ( Dv DDBCTL_LINES )
1.1 pavel 2475: Number of display lines.
1.91 kamil 2476: .It Li ddb.tabstops ( Dv DDBCTL_TABSTOPS )
1.1 pavel 2477: Tab width.
1.91 kamil 2478: .It Li ddb.onpanic ( Dv DDBCTL_ONPANIC )
1.63 riz 2479: If greater than zero, DDB will be entered if the kernel panics.
2480: A value of 1 causes the system to enter DDB on panic, while a value of 2
2481: causes the kernel to attempt to print out a stack trace before entering DDB.
2482: A value of 0 causes the kernel to attempt to print a stack trace, then
1.64 wiz 2483: reboot, while a value of \-1 means neither a stack trace will be printed
1.63 riz 2484: nor DDB entered.
1.91 kamil 2485: .It Li ddb.fromconsole ( Dv DDBCTL_FROMCONSOLE )
1.1 pavel 2486: If not zero, DDB may be entered by sending a break on a serial
2487: console or by a special key sequence on a graphics console.
1.34 jruoho 2488: .It Li ddb.tee_msgbuf
2489: If not zero, DDB will output also to the kernel message buffer.
2490: .It Li ddb.commandonenter
2491: If not empty, a command to be executed on each enter to the
2492: .Tn DDB .
2493: .\"
2494: .\" XXX: (a) ddb.commandonenter is missing in ddb(4);
2495: .\" (b) No DDBCTL definitions for tee_msgbuf and commandonenter.
1.1 pavel 2496: .El
2497: .Pp
1.34 jruoho 2498: Some of these
2499: .Tn MIB
2500: nodes are also available as variables from within the debugger.
1.1 pavel 2501: See
2502: .Xr ddb 4
2503: for more details.
1.91 kamil 2504: .Ss The security.* subtree ( Dv CTL_SECURITY )
1.1 pavel 2505: The
2506: .Li security
2507: level contains various security-related settings for
1.2 wiz 2508: the system.
1.43 jruoho 2509: The available second level names are:
2510: .Bl -column "Second level name" "integer" "Changeable" -offset indent
1.107 wiz 2511: .It Sy Second level name Ta Sy Type Ta Sy Changeable
1.43 jruoho 2512: .It Li security.curtain integer yes
2513: .It Li security.models node not applicable
2514: .It Li security.pax node not applicable
2515: .El
2516: .Pp
1.2 wiz 2517: Available settings are detailed below.
1.1 pavel 2518: .Bl -tag -width "123456"
2519: .It Li security.curtain
1.43 jruoho 2520: If non-zero, will filter return objects according to the user
2521: .Tn ID
1.95 pgoyette 2522: requesting information about them, preventing users from
2523: accessing any objects they do not own.
1.1 pavel 2524: .Pp
2525: At the moment, it affects
2526: .Xr ps 1 ,
2527: .Xr netstat 1
2528: (for
2529: .Dv PF_INET ,
2530: .Dv PF_INET6 ,
2531: and
2532: .Dv PF_UNIX
2533: PCBs), and
2534: .Xr w 1 .
1.4 elad 2535: .It Li security.models
2536: .Nx
2537: supports pluggable security models.
1.17 ad 2538: Every security model used, whether if loaded as a module or built with the system,
1.4 elad 2539: is required to add an entry to this node with at least one element,
2540: .Dq name ,
2541: indicating the name of the security model.
2542: .Pp
2543: In addition to the name, any settings and other information private to the
2544: security model will be available under this node.
2545: See
2546: .Xr secmodel 9
2547: for more information.
1.1 pavel 2548: .It Li security.pax
2549: Settings for PaX -- exploit mitigation features.
1.4 elad 2550: For more information on any of the PaX features, please see
2551: .Xr paxctl 8
2552: and
1.62 jruoho 2553: .Xr security 7 .
1.43 jruoho 2554: The available third and fourth level names are:
2555: .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \
2556: -offset 2n
2557: .It Sy Third and fourth level names Ta Sy Type Ta Sy Changeable
2558: .It Li security.pax.aslr.enabled integer yes
2559: .\".It Li security.pax.aslr.exec_len integer yes
2560: .It Li security.pax.aslr.global integer yes
2561: .\".It Li security.pax.aslr.mmap_len integer yes
2562: .\".It Li security.pax.aslr.stack_len integer yes
2563: .It Li security.pax.mprotect.enabled integer yes
2564: .It Li security.pax.mprotect.global integer yes
1.100 christos 2565: .It Li security.pax.mprotect.ptrace integer yes
1.43 jruoho 2566: .It Li security.pax.segvguard.enabled integer yes
2567: .It Li security.pax.segvguard.expiry_timeout integer yes
2568: .It Li security.pax.segvguard.global integer yes
2569: .It Li security.pax.segvguard.max_crashes integer yes
2570: .It Li security.pax.segvguard.suspend_timeout integer yes
2571: .El
1.1 pavel 2572: .Bl -tag -width "123456"
1.43 jruoho 2573: .It Li security.pax.aslr.enabled
1.14 elad 2574: Enable PaX ASLR (Address Space Layout Randomization).
2575: .Pp
2576: The value of this
2577: knob must be non-zero for PaX ASLR to be enabled, even if a program is set to
2578: explicit enable.
1.43 jruoho 2579: .\".It Li security.pax.aslr.exec_len
2580: .\" XXX: Undocumented.
1.14 elad 2581: .It Li security.pax.aslr.global
2582: Specifies the default global policy for programs without an
2583: explicit enable/disable flag.
2584: .Pp
2585: When non-zero, all programs will get PaX ASLR, except those exempted with
1.69 wiz 2586: .Xr paxctl 8 .
1.14 elad 2587: Otherwise, all programs will not get PaX ASLR, except those specifically
2588: marked as such with
2589: .Xr paxctl 8 .
1.43 jruoho 2590: .\".It Li security.pax.aslr.mmap_len
2591: .\" XXX: Undocumented.
2592: .\" .It Li security.pax.aslr.stack_len
2593: .\" XXX: Undocumented.
2594: .It Li security.pax.mprotect.enabled
1.1 pavel 2595: Enable PaX MPROTECT restrictions.
2596: .Pp
2597: These are
2598: .Xr mprotect 2
1.2 wiz 2599: restrictions to better enforce a W^X policy.
2600: The value of this
1.1 pavel 2601: knob must be non-zero for PaX MPROTECT to be enabled, even if a
2602: program is set to explicit enable.
2603: .It Li security.pax.mprotect.global
2604: Specifies the default global policy for programs without an
2605: explicit enable/disable flag.
2606: .Pp
2607: When non-zero, all programs will get the PaX MPROTECT restrictions,
2608: except those exempted with
1.69 wiz 2609: .Xr paxctl 8 .
1.1 pavel 2610: Otherwise, all programs will not get the PaX MPROTECT restrictions,
2611: except those specifically marked as such with
1.4 elad 2612: .Xr paxctl 8 .
1.100 christos 2613: .It Li security.pax.mprotect.ptrace
2614: This variable allows
2615: .Xr ptrace 2
2616: to override PaX MPROTECT permissions.
2617: It can have the following values:
2618: .Bl -tag -width XX -compact
2619: .It 0
2620: Does not let override any permissions.
2621: .It 1
2622: Disables PaX MPROTECT from processes that start executing while traced (default).
2623: .It 2
2624: Bypasses PaX MPROTECT for all processes being traced.
2625: .El
1.43 jruoho 2626: .It Li security.pax.segvguard.enabled
1.1 pavel 2627: Enable PaX Segvguard.
2628: .Pp
2629: PaX Segvguard can detect and prevent certain exploitation attempts, where
2630: an attacker may try for example to brute-force function return addresses
2631: of respawning daemons.
2632: .Pp
2633: .Em Note :
2634: The
2635: .Nx
2636: interface and implementation of the Segvguard is still experimental, and may
2637: change in future releases.
1.43 jruoho 2638: .It Li security.pax.segvguard.expiry_timeout
2639: If the max number was not reached within this timeout (in seconds), the entry
2640: will expire.
1.1 pavel 2641: .It Li security.pax.segvguard.global
2642: Specifies the default global policy for programs without an
2643: explicit enable/disable flag.
2644: .Pp
2645: When non-zero, all programs will get the PaX Segvguard,
2646: except those exempted with
1.69 wiz 2647: .Xr paxctl 8 .
1.2 wiz 2648: Otherwise, no program will get the PaX Segvguard restrictions,
1.1 pavel 2649: except those specifically marked as such with
1.4 elad 2650: .Xr paxctl 8 .
1.43 jruoho 2651: .It Li security.pax.segvguard.max_crashes
2652: The maximum number of segfaults a program can receive before suspension.
1.1 pavel 2653: .It Li security.pax.segvguard.suspend_timeout
2654: Number of seconds to suspend a user from running a faulting program when the
2655: limit was exceeded.
2656: .El
2657: .El
1.91 kamil 2658: .Ss The vendor.* subtree ( Dv CTL_VENDOR )
1.1 pavel 2659: The
2660: .Li vendor
2661: toplevel name is reserved to be used by vendors who wish to
2662: have their own private MIB tree.
2663: Intended use is to store values under
2664: .Dq vendor.\*[Lt]yourname\*[Gt].* .
2665: .Sh SEE ALSO
2666: .Xr sysctl 3 ,
2667: .Xr ipsec 4 ,
2668: .Xr tcp 4 ,
1.62 jruoho 2669: .Xr security 7 ,
1.1 pavel 2670: .Xr sysctl 8
2671: .Sh HISTORY
2672: The
2673: .Nm
2674: variables first appeared in
2675: .Bx 4.4 .
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