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PFLOG(4) Kernel Interfaces Manual PFLOG(4) NAME pflog -- packet filter logging interface SYNOPSIS device pflog DESCRIPTION The pflog interface is a 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). The pflog0 interface is created when the pflog module is loaded; further instances can be created using ifconfig(8). The pflog module is loaded au- tomatically if both pf(4) and pflogd(8) are enabled. 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; uid_t uid; pid_t pid; uid_t rule_uid; pid_t rule_pid; u_int8_t dir; u_int8_t pad[3]; u_int32_t ridentifier; }; EXAMPLES Create a pflog interface and monitor all packets logged on it: # ifconfig pflog create pflog1 # ifconfig pflog1 up # tcpdump -n -e -ttt -i pflog1 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. BUGS FreeBSD does not set a process id in the pid field in pfloghdr. FreeBSD ports 15.quarterly October 29, 2021 PFLOG(4)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | BUGS
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