Re: Splitter

[syedk <syedk@intotoinc.com>]

you can look into dev_queue_xmit(sk_buff) function in net/core/dev.c

 sk_buff->dev  has the information abt the device (can be any interface
registered using register_netdevice() for that matter)...

dev_queue_xmit just transfers the sk_buff for the device for
delivery....

I feel the best way to solve your problem would be use NF_IP_PRE_ROUTING
hook of netfilter by which u get all packets ( even before any routing
decisions has been made : that is what u wanted RIGHT??) and then call
dev_queue_xmit function by setting the sk_buff->dev as whatever
interface u wish to redirect....

I hope this would help....

Best regards
syed sk


On Tue, 2004-03-23 at 15:09, K.Anantha Kiran wrote:
> Hi,
>  Thanks a lot for ur guidance.
>  I am following the same files(i mean NET directory).But i am facing 
> following problem.
>  " where the output interface variable (rtable->key->oif) is changed to 
> the index of interface through which packet has to go out. In the function 
> /net/route.c ip_route_input_slow() they are setting it to 0 what is it 
> mean.
> 
> 	When a packet has to be put on to an interface what are the fields 
> will it use to decide that( in skbuff structure).
> 
> Thanks 
> regards,
> K. Anantha kiran
> 
> 
> On Mon, 22 Mar 2004, Jad Saklawi wrote:
> 
> > Date: Mon, 22 Mar 2004 09:41:22 +0200
> > From: Jad Saklawi <Jad@Saklawi.info>
> > To: K.Anantha Kiran <ananth@cse.iitk.ac.in>
> > Cc: linux-c-programming@vger.kernel.org
> > Subject: Re: Splitter
> > 
> > K.Anantha Kiran wrote:
> > 
> > >Hi,
> > > Thanks for ur suggetsion.
> > > But we are not clear about the sentece "re invent the loop".
> > > Can u give clear explanantion about the "iptables" solution.
> > > IMP: Our machine should not work like a router.I should be able to decide 
> > >to which interface i want to redirect to , on the fly for each packet 
> > >using a HASH like functions.
> > >  
> > >
> >  It`s your choice then, check out net/core/dev.c net/core/dv.c 
> > net/ipv4/tcp_input.c net/ipv4/tcp_output.c net/ethernet/eth.c You have 
> > to take a look at the whole net directory and modify accordingly. I 
> > doubt you will be able to do any thing. Any way good luck!!!
> > 
> > Greets,
> > Jad
> > 
> 
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