The netfilter.org "libnetfilter_queue" project What is libnetfilter_queue? libnetfilter_queue is a userspace library providing an API to packets that have been queued by the kernel packet filter. It is is part of a system that deprecates the old ip_queue / libipq mechanism. libnetfilter_queue has been previously known as libnfnetlink_queue. libnetfilter_queue requires libnfnetlink and a kernel that includes the nfnetlink_queue subsystem (i.e. 2.6.14 or later). - receiving queued packets from the kernel
nfnetlink_queue subsystem - issuing verdicts and/or reinjecting altered packets to the kernel
nfnetlink_queue subsystem
You can check the library documentation generated in doxygen format. libnetfilter_queue has been written by Harald Welte.
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