Re: [Divert] Linux 2.4.x kernel?

[Ilia B. <ib...@pi...>]

A module should be able to do the same thing as whatever I put directly
in the kernel. I remember a while ago Alan Cox turned the whole TCP/IP
into a module (I guess he had some free time on his hands :-) ) and
it worked, so its really not an issue.
Raw sockets' main disadvantage - can't do injection up the protocol
stack - only on the wire.
-ilia

Feiyi Wang wrote:

> if you just want to inject a brand new packet, can raw socket do?  Of
> course, the interface is not unified in this case. For netfilter, a moudule
> maybe sufficient for this purpose (haven't looked closely at libq to see if
> a user space program can also do that).
>
> Ilia, I am not sure if a module can give you the exact interface as orginal
> divert socket, in other words, I suspect that more involvment is needed, I
> guess it is up to you to find out :-)
>
> -Feiyi
>
> Jan Møller wrote:
> >
> > I would say that netfiter can do almost the same as divert sockets. But
> > there is a major difference.
> > When using netfilter you can  modify and remove packets in the packet
> > stream.
> > When using divert sockets you can modify, remove and inject packets in the
> > packet stream.
> > The packet injection is a very important feature for some uses.
> >
> > Unfortunately you cannot do that with netfilter in the Linux 2.4 kernel.
> > When a packet pops from the kernel to userspace using netfilter, the user
> > space application may either ignore it (remove it from the packet stream)
> > or modify it. You cannot inject a packet without receiving one first.
> >
> > It would infact be nice if divert would be ported to Linux 2.4 or if
> > netfilter would allow packet injection.
> >
> > -- J. Miller
> >
>
> --
> Feiyi Wang, Ph.D.
> Advanced Networking Research, MCNC
> (919) 248-1421 (ph) (919) 248-1455 (fax)
> -------------------------------------------------------------------------
> Divert Sockets for Linux List
> mailto:di...@li...
> http://www.anr.mcnc.org/~divert
> -------------------------------------------------------------------------

--
-------------------------------------+----------------------
Ilia Baldine, PhD                    | ib...@an...
Network Research Engineer,           | ph#:(919)248-1847
Advanced Networking Research, MCNC   | FAX:(919)248-1455
http://people.anr.mcnc.org/~ibaldin  |
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"I used to think the brain was the most important part
of the body, but then I realized who was telling me that."
                        -Emo Philips
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