query about wrtitng a netfilter module

how can i write a module program that will be called at NF_IP_LOCAL_OUT? actually i want to call a function that processes on the packet that is builded in packet outgoing process. for that i want that module to be integrated part of linux
kernel.how can i then make that module to be called at NF_IP_LOCAL_OUT?
b123coderAsked:
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scnCommented:
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b123coderAuthor Commented:
hi scn,
           Is there any website that provide more  netfilter module examples?
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scnCommented:
Sorry, I am not aware of such websites.
In the kernel source code, there are some modules that make use of the netfilter hooks, e.g. net/ipv4/netfilter/iptable_netfilter.c. Even if they are quite complex, they can give some ideas.
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