What I thought of doing, is map the skbuff to user-space. Have the user-application alter the headers. Send the (same) skbuff from kernel-space.
Does there exist anything equivalent?
yes; netfilter has facilities for this actually afaik. tcpdump also uses something like this (but only in one direction), it mmaps some ringbuffer with incomming packets.
Are you refering to NF_QUEUE + libipq ? I was under the impression that it does involve memcpy.
Also, I think that with this you cannot change routing decisions made on the packet, although, I'm not sure yet how critical this is for me.
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