LARTC - Apr 2002 - Netgraph and linux

Hi,
FreeBSD has netgraph - graph based kernel networking subsystem which work
with nodes and hooks. With netgraph is posible to make Layer 3 switch and
more. E.g. In some node I capture raw datagram packet and encapsulate it
in udp packet and send to next hook. So I can bridge any packet over
routed network.
Is something similar for linux ? I don''t think about Layer 3 switch but
I
think about generic tool for manipulation with raw packets.

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