Re: [PATCH][RFC] etherip: Ethernet-in-IPv4 tunneling

[Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>]

On Thu, Jan 13, 2005 at 01:28:06AM +0100, Thomas Graf wrote:

> > What's that?  I can't find it in my kernel tree nor on google.
> 
> Typo, sorry. I meant ip_tunnel_parm. Thinking of it, shouldn't protocol
> in ip_tunnel_parm->iph->protocol be set to ETHER_IP so userspace could
> find out this way?

ip_tunnel_parm->iph->protocol for ether/ip tunnels is IPPROTO_ETHERIP,
which is 97.  So yeah, the info is in there.  But this doesn't help you
much in determining whether an arbitrary network device is in fact an
ether/ip tunnel or not, since SIOCGETTUNNEL aliases with SIOCDEVPRIVATE+3.

The only way to make it stand out would be to give it its own ARPHRD_
type, but then it wouldn't look like an ethernet device anymore.


cheers,
Lennert