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SubjectRe: Trapping all Incoming Network Packets
prade@cs.sunysb.edu wrote:

> I want to sniff the packets, and make a
> decision based on certain characteristics of each packet. So I need to
> have a filter between the IP and link-layer. Also, I do not want the
> filter to slow down traffic. Hence I believe implementing inside kernel
> will be more efficient.

Write a netfilter module and bind it in to NF_IP_PRE_ROUTING or NF_IP_LOCAL_IN
as appropriate. This will allow you to analyze the packet and decide whether to
keep or discard it (or mangle it if you want).

This is what netfilter is there for.

Chris

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