Re: filtering packtes before OS takes care about them

[bert hubert <ahu@xxxxxxx>]

On Mon, Feb 28, 2005 at 05:16:57PM +0100, Weber Matthias wrote:

> i need a possibility to catch IP4 packets (from ethernet devices) before
> OS' netmodules (IP, UDP, TCP, ICMP, ARP, ROUTE, NETFILTER ...) takes care
> about them and

Why? It helps if you tell us what you really want, or is this a research
project? 

The earliest place I know of is with tc filter, but that is a netfilter
hook. So part of netfilter will "see" your code.

What you appear to be asking for is a packet filtering network adaptor?
These exist.

> * to modify packet headers and move packets to interface related output
> * buffers

Sure you want an operating system? 

Good luck!

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