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NAME

     pflog - packet filter logging interface

SYNOPSIS

     device pflog

DESCRIPTION

     The pflog interface is a pseudo-device which makes visible all packets
     logged by the packet filter, pf(4).  Logged packets can easily be
     monitored in real time by invoking tcpdump(1) on the pflog interface, or
     stored to disk using pflogd(8).

     Each packet retrieved on this interface has a header associated with it
     of length PFLOG_HDRLEN.  This header documents the address family,
     interface name, rule number, reason, action, and direction of the packet
     that was logged.  This structure, defined in 〈net/if_pflog.h〉 looks like

           struct pfloghdr {
                   u_int8_t        length;
                   sa_family_t     af;
                   u_int8_t        action;
                   u_int8_t        reason;
                   char            ifname[IFNAMSIZ];
                   char            ruleset[PF_RULESET_NAME_SIZE];
                   u_int32_t       rulenr;
                   u_int32_t       subrulenr;
                   u_int8_t        dir;
                   u_int8_t        pad[3];
           };

EXAMPLES

           # ifconfig pflog0 up
           # tcpdump -n -e -ttt -i pflog0

SEE ALSO

     tcpdump(1) inet(4), inet6(4), netintro(4), pf(4), ifconfig(8), pflogd(8)

HISTORY

     The pflog device first appeared in OpenBSD 3.0.