> hi gurus,
>
> I make the following assumption (text in bold), if its wrong tell me the actual story.
>
> "In ip.c ip gives the whole ip packet (with header) to the raw socket implementation. (RSI)
Correct.
But please don't invent new acronyms like that.
>
>
> RSI strips the ip header off and gives the "raw ICMP" packet to the application which uses the socket.
Raw sockets always deliver with the IP header.
>
>
> Also the application when it wants to send a "raw ICMP" packet, it gives it to the RSI, which in turn
> gives it to ip.c which wraps it with IP header and sends it out."
Unless you set IP_HDRINCL yes.
>
> is the story same for any other non-kernel related protocols.
>
Yes. And even for kernel related protocols.
This all and more is documented in raw(7), part of manpages 1.25+
-Andi
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