Re: new frame generation in user-defined target

On Monday 29 November 2004 17:22, Aitor Alvarez Gila wrote:
> Hi,
>
> I'm trying to create a new user-defined target for ebtables, which would
> process incoming frames and insert some management frames into a packet
> flow, and I'd like to know if it would be possible to create a new sk_buff
> and append it to the current socket buffer list (using skb_append(), e.g.)
> in the same target code. Would the kernel handle it correctly?

I think you can do this in a similar way as the ip defragmenting code works. 
Your IP fragments will then be defragmented before sent out of the bridge (if 
connection tracking is in the kernel).

I don't know all the details, but have a look at 
net/ipv4/ip_fragment.c:ip_defrag() for clues.

If you alter the packet, you need to check (skb_shared(*pskb) || 
skb_cloned(*pskb)), see e.g. ebt_redirect.c.

cheers,
Bart



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