libnetfilter_log is a userspace library providing interface to packets that have been logged by the kernel packet filter. It is is part of a system that deprecates the old syslog/dmesg based packet logging.
libnetfilter_log homepage is: http://netfilter.org/projects/libnetfilter_log/
libnetfilter_log requires libnfnetlink and a kernel that includes the nfnetlink_log subsystem (i.e. 2.6.14 or later).
The current development version of libnetfilter_log can be accessed at https://git.netfilter.org/cgi-bin/gitweb.cgi?p=libnetfilter_log.git