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LEARN ABOUT OPENSOLARIS

pflog

PFLOG(4)						   BSD Kernel Interfaces Manual 						  PFLOG(4)

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 mon-
     itored in real time by invoking tcpdump(1) on the pflog interface, or stored to disk using pflogd(8).

     The pflog0 interface is created automatically at boot if both pf(4) and pflogd(8) are enabled; further instances can be created using
     ifconfig(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;
		   uid_t	   uid;
		   pid_t	   pid;
		   uid_t	   rule_uid;
		   pid_t	   rule_pid;
		   u_int8_t	   dir;
		   u_int8_t	   pad[3];
	   };

EXAMPLES

     Create a pflog interface and monitor all packets logged on it:

	   # 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.

BSD
								 December 10, 2001							       BSD

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