squarooticus

table ip mangle {
    chain prerouting {
        type filter hook prerouting priority mangle; policy accept;
        ip daddr 224.0.0.251 iif eth3 ip saddr set 192.168.2.1 dup to 224.0.0.251 device eth2 notrack
        ip daddr 224.0.0.251 iif eth2 ip saddr set 192.168.3.1 dup to 224.0.0.251 device eth3 notrack
    }
}

table ip6 mangle {
    chain prerouting {

GaelVaroquaux

Cython example of exposing C-computed arrays in Python without data copies

The goal of this example is to show how an existing C codebase for numerical computing (here c_code.c) can be wrapped in Cython to be exposed in Python.

The meat of the example is that the data is allocated in C, but exposed in Python without a copy using the PyArray_SimpleNewFromData numpy