What does Netfilter with the result of the modules called on hook?

Link of the tutorial (suggest me a better name):

Thank you for the presentation of the nitty-gritty of iptables & netfilter. I would like to know how netfilter handle the result of the hooked modules.

As you explain, every module return an a decision to netfilter. As netfilter call all modules in turn, how it makes the final decision?



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