fnfqueue

Fast netfilter nfqueue python and C interface. Gets the speed from

avoiding memory allocation
batching reads (uses recv_mmsg)

It also does not use the callback-like interface of libnetfilter-queue and provides a more python like iterator interface. Additionally, it doesn't assume anything and therefore doesn't automatically set verdicts on packets (unlike python-nfqueue in debian which accepts everything after you return from the callback...)

It can handle ping -f (even iperf if the moon is in the right spot) to localhost from within python.

Focus is on a python like interface.

Short example for mangling packets:

iptables -A OUTPUT <filter here> -j NFQUEUE --queue-num 1

import fnfqueue

queue = 1
conn = fnfqueue.Connection()

try:
    q = conn.bind(queue)
    q.set_mode(0xffff, fnfqueue.COPY_PACKET)
except PermissionError:
    print("Access denied; Do I have root rights or the needed capabilities?")
    sys.exit(-1)

while True:
    try:
        for packet in conn:
            packet.payload = packet.payload # modify the packet here
            packet.mangle()
    except fnfqueue.BufferOverflowException:
        print("buffer error")
        pass

conn.close() # this can be called concurrently to cancel the above for loop

Help is provided as python docs.

No C libraries are needed. Needs cffi for building. Kernel and libc must be recent enough to support nfqueue and recvmmsg (linux 2.6.33, glibc 2.12 - more recent kernels provide better performance).

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fnfqueue 1.1.2

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