On Tue, 18 Oct 2016 14:21:50 +0000, Shawn Bakhtiar wrote:
> On Oct 18, 2016, at 6:49 AM, Samira Nazari
> <nazari....@gmail.com<mailto:nazari....@gmail.com>> wrote:
> > Hello every one,
> > When we diverte packets to the specified port with "IPFW divert" ,
> > we can change it and re-sent to the kernel?
> Not sure what you mean by change it but:
> "Divert sockets are similar to raw IP sockets, except that they can
> be bound to a specific divert port via the bind(2) system call. The
> IP address in the bind is ignored; only the port number is
> significant. A divert socket bound to a divert port will receive all
> packets diverted to that port by some (here unspecified) kernel
> mechanism(s). Packets may also be written to a divert port, in which
> case they re-enter kernel IP packet processing."
> -- SRC:
Apart from divert(4), most likely the best example is the natd(8) code,
which modifies packet source or destination addresses and (maybe) ports.
Ignoring the NAT processing - or not, as appropriate - the way natd uses
divert sockets both to receive packets from ipfw and later (perhaps) to
reinject them for further processing should show clearly how it's done.
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