NetBSD/usr.sbin/npf/npf-params.7

.\" $NetBSD: npf-params.7,v 1.3 2019/08/11 20:25:14 rmind Exp $
.\"
.\" Copyright (c) 2019 Mindaugas Rasiukevicius <rmind at netbsd org>
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.Dd August 3, 2019
.Dt NPF-PARAMS 7
.Os
.Sh NAME
.Nm npf-params
.Nd tunable NPF parameters
.Sh DESCRIPTION
NPF supports a set of dynamically tunable parameters.
.Pp
All parameter values are integers and should generally be between and INT_MAX,
unless specified otherwise.
Some parameters values can be negative; such values would typically
have a special meaning.
Enable/disable switches should be represented as boolean values 0 ("off")
or 1 ("on").
.Sh PARAMETERS
.Bl -tag -width "123456"
.\" ---
.Bl -tag -width "123456"
.It Li bpf.jit
BPF just-in-time compilation: enables or disables
.Xr bpfjit 4
support.
Some machine architectures are not presently supported by
.Xr bpfjit 4 .
Setting this parameter to off stops NPF from trying to enable this
functionality, and generating a warning if it is unable to do so.
Default: 1.
.El
.\" ---
.Bl -tag -width "123456"
.It Li gc.step
Number of connection state items to process in one garbage collection
(G/C) cycle.
Must be positive number.
Default: 256.
.El
.\" ---
.It Li state.generic
Generic state tracking parameters for non-TCP flows.
All timeouts are in seconds and must be zero or positive.
.Bl -tag -width "123456"
.It Li timeout.new
Timeout for new ("unsynchronized") state.
Default: 30.
.It Li timeout.established
Timeout for established ("synchronized") state.
Default: 60.
.It Li timeout.closed
Timeout for closed state.
Default: 0.
.El
.\" ---
.It Li state.tcp
State tracking parameters for TCP connections.
All timeout values are in seconds.
.Bl -tag -width "123456"
.It Li max_ack_win
Maximum allowed ACK window.
Default: 66000.
.It Li strict_order_rst
Enforce strict order RST.
Default: 1.
.\" -
.It Li timeout.new
Timeout for a new connection in "unsynchronized" state.
Default: 30.
.It Li timeout.established
Timeout for an established connection ("synchronized" state).
Default: 86400.
.It Li timeout.half_close
Timeout for the half-close TCP states.
Default: 3600.
.It Li timeout.close
Timeout for the full close TCP states.
Default: 10.
.It Li timeout.time_wait
Timeout for the TCP time-wait state.
Default: 240.
.El
.\" ---
.It Li portmap.min_port
Lower bound of the port range used when selecting the port for dynamic NAT
with port translation enabled.
Default: 1024 (also the lowest allowed value).
.It Li portmap.max_port
Upper bound of the port range as described above.
Default: 65535 (also the highest allowed value).
.\" ---
.El
.\" -----
.Sh EXAMPLES
An example line in the
.Xr npf.conf 5
configuration file:
.Bd -literal -offset indent
set state.tcp.strict_order_rst on       # "on" can be used instead of 1
set state.tcp.timeout.time_wait 0       # destroy the state immediately
.Ed
.\" -----
.Sh SEE ALSO
.Xr libnpf 3 ,
.Xr npfkern 3 ,
.Xr bpfjit 4 ,
.Xr npf.conf 5 ,
.Xr pcap-filter 7 ,
.Xr npfctl 8
.\" -----
.Sh AUTHORS
NPF
was designed and implemented by
.An Mindaugas Rasiukevicius .