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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 It is is part of a system that replaces the old ip_queue / libipq mechanism (withdrawn in kernel 3.5).

After much Googling, it appears to me that the simplest (yet reasonably robust) method of doing so (on any platform) is Linux's libnetfilter_queue project. However, I'm having trouble finding any reasonable documentation for the project, outside of the limited official documentation. Its main features (as stated by the first link are)

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libnetfilter_queue is dependent of message sent to a socket. The send/recv operation need to be protected by lock to avoid concurrent writing. This means that the nfq_set_verdict2 and nfq_handle_packet function needs to be protected by lock mechanism.

The search service can find package by either name (apache),provides(webserver), absolute file names (/usr/bin/apache),binaries (gprof) or shared libraries (libXm.so.2) instandard path. It does not support multiple arguments yet... The System and Arch are optional added filters, for exampleSystem could be "redhat", "redhat-7.2", "mandrake" or "gnome", Arch could be "i386" or "src", etc. depending on your system. System Arch RPM resource libnetfilter_queuelibnetfilter_queue is a userspace library providing an API to packets that havebeen queued by the kernel packet filter. It is is part of a system thatdeprecates the old ip_queue / libipq mechanism.libnetfilter_queue has been previously known as libnfnetlink_queue.

I want to implement a network delay model for TCP/UDP traffic as described in Linux libnetfilter_queue delayed packet problem. I have followed the suggestion of Andy there, copying entire packet to my program and placing it an a priority queue. As time passes, packets in priority queue are removed and dispatched using RAW sockets.

The problem I am facing is this: Initial capture of packets by libnetfilter_queue is being done by matching the ports (sudo iptables -A OUTPUT -p udp --dport 8000 -j NFQUEUE --queue-num 0). When these packets are reinjected by RAW sockets, they are picked up once again by libnetfilter_queue (since the port remains the same) and hence continue to loop forever.

Hmm, you're passing --with-libnetfilter_queue-includes=/usr/include/libnetfilter_queue-1.0.2/, and Suricata's configure will add libnetfilter_queue/libnetfilter_queue.h to that. Are you sure the version number is part of the path on your system? /usr/include/libnetfilter_queue-1.0.2/. If so, I guess you should create a symlink to /usr/include/libnetfilter_queue

Can you try with --with-libnetfilter-queue-includes=/usr/include/libnetfilter_queue-1.0.2/ --with-libnetfilter-queue-libraries=/usr/include/libnetfilter_queue-1.0.2/ Note: replaced the underscore by a dash in --with-libnetfilter-queue-includes and --with-libnetfilter-queue-libraries

I've actually come across this today as I have installed a newer libnetfilter_queue version (1.0.2) from a RPM entitled libnetfilter_queue1 that I found. That indeed created /usr/include/libnetfilter-1.0.2 where it stored the files and you'd therefore needed to have passed the include directory in the configure command.

and thus cannot install. I have installed the libnetfilter_queue1 and libnetfilter_queue-devel packages and neither solve this issue, and have seperatly installed libnetfilter_queue through it's RPM with no luck

I dug this up when searching for a solution to the same problem. I found that the problem was that the package should not be "+libnetfilter_queue" but instead actually "+libnetfilter-queue" . Hope you find this answer at least somewhat helpful a year later.

libnetfilter_queue is a userspace library providing an API to packetsthat have been queued by the kernel packet filter. It is part of asystem that deprecates the old ip_queue / libipq mechanism.This package provides development files and static libraries. Tags: Software Development: Libraries, Role: Development Library

When the kernel queue becomes full, all new packets are dropped, causing existing connections to fail. The 'fail-open' feature allows a user to temporarily disable the packet inspection and maintain the connectivity under heavy network traffic. For reference, see -en/using-nfqueue-and-libnetfilter_queue/. e24fc04721