1.\" $NetBSD: pflog.4,v 1.7 2018/08/17 12:36:53 maxv Exp $ 2.\" $OpenBSD: pflog.4,v 1.10 2007/05/31 19:19:51 jmc Exp $ 3.\" 4.\" Copyright (c) 2001 Tobias Weingartner 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd August 17, 2018 28.Dt PFLOG 4 29.Os 30.Sh NAME 31.Nm pflog 32.Nd packet filter logging interface 33.Sh SYNOPSIS 34.Cd "pseudo-device pflog" 35.Sh DESCRIPTION 36.Bf -symbolic 37The NetBSD version of PF is obsolete, and its use is strongly discouraged. 38Use 39.Xr npf 7 40instead. 41.Pp 42.Ef 43The 44.Nm pflog 45interface is a pseudo-device which makes visible all packets logged by 46the packet filter, 47.Xr pf 4 . 48Logged packets can easily be monitored in real 49time by invoking 50.Xr tcpdump 8 51on the 52.Nm 53interface, or stored to disk using 54.Xr pflogd 8 . 55.Pp 56The pflog0 interface is created automatically at boot if both 57.Xr pf 4 58and 59.Xr pflogd 8 60are enabled; 61further instances can be created using 62.Xr ifconfig 8 . 63.Pp 64Each packet retrieved on this interface has a header associated 65with it of length 66.Dv PFLOG_HDRLEN . 67This header documents the address family, interface name, rule 68number, reason, action, and direction of the packet that was logged. 69This structure, defined in 70.Aq Pa net/if_pflog.h 71looks like 72.Bd -literal -offset indent 73struct pfloghdr { 74 u_int8_t length; 75 sa_family_t af; 76 u_int8_t action; 77 u_int8_t reason; 78 char ifname[IFNAMSIZ]; 79 char ruleset[PF_RULESET_NAME_SIZE]; 80 u_int32_t rulenr; 81 u_int32_t subrulenr; 82 uid_t uid; 83 pid_t pid; 84 uid_t rule_uid; 85 pid_t rule_pid; 86 u_int8_t dir; 87 u_int8_t pad[3]; 88}; 89.Ed 90.Sh EXAMPLES 91Create a 92.Nm 93interface 94and monitor all packets logged on it: 95.Bd -literal -offset indent 96# ifconfig pflog1 up 97# tcpdump -n -e -ttt -i pflog1 98.Ed 99.Sh SEE ALSO 100.Xr inet 4 , 101.Xr inet6 4 , 102.Xr netintro 4 , 103.Xr pf 4 , 104.Xr ifconfig 8 , 105.Xr pflogd 8 , 106.Xr tcpdump 8 107.Sh HISTORY 108The 109.Nm 110device first appeared in 111.Ox 3.0 . 112.\" .Sh BUGS 113.\" Anything here? 114