Date: Sun, 17 Jun 2001 21:51:19 -0700 From: Julian Elischer <julian@elischer.org> To: David Preece <davep@afterswish.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Injecting a packet with explicit route. Message-ID: <3B2D88C7.1393A08E@elischer.org> References: <5.1.0.14.1.20010618114548.01ef31b0@pop.paradise.net.nz>
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David Preece wrote:
>
> Hi,
>
> Due to the wonder of IPFW and divert sockets I have been merrily catching
> packets, modifying them and reinjecting back in from userland to great
> effect for some time now. What I would like (need) to do is much the same,
> but being able to explicitly state which route to take (for a packet going
> outwards), or being able to tell which route a packet came in from (for a
> packet coming inwards).
>
> I suspect the necessary stunts are to have access to sufficiently low level
> networking to be able to capture and write a packet with layer 2
> information, which probably involves netgraph? Can anyone think of another
> way? Oh, and if I do go to netgraph (in itself not a bad thing), do I have
> to use a kernel mode debugger - just too addicted to KDevelop I guess.
the address you get from the divert socket includes (if you know where to look)
the incoming interface..
you can the resend back to a specific rule
and use the 'fwd' rules to send out different
interfaces
>
> Thanks,
> Dave
>
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