(usagi-users 03771) Re: About IPv6 forwarding

Well, I have found the solution to the second question, but the first 
one stay open :
- first : I am still looking for a better way to see (in ip6_output2()) 
if a packet is forwarded or generated by the host (this is for my shim6 
implementation).
- second : I am currenty using skb->input_dev. This was a problem of 
config options, not kernel version : when cloning an skbuff (function 
skb_clone() in net/core/skbuff.c), the input_dev field is copied only if 
options NET_SCHED and NET_CLS_ACT are defined. I have changed this, and 
my prototype works fine now.

Sébastien.

Sébastien Barré escribió:
> Hi,
>
> I am looking for a clean way to see, within ip6_output2() 
> (net/ipv6/ip6_output.c), if the outgoing skbuff is a forwarded one, or 
> is generated by the host.
> In Linux 2.6.15, I was doing that by looking skb->input_dev. If NULL I 
> declared it as being generated by the host.
> But with kernel 2.6.17.11, this does no longer work.
>
> BTW, I am wondering why skb->input_dev is sometimes defined for host 
> generated packets (which is why my previous method no longer works).
> For example, when doing an ssh, I have input_dev defined for the 
> (outgoing, of course)
> - SYN and FIN segments
> - most, but not all of ssh packets.
>
> Anybody can help ?
>
> Thank you in advance,
>
> Sébastien.
>

-- 
Sébastien Barré
Researcher,
CSE department, UCLouvain, Belgium