Re: [MirageOS-devel] auto configuring ip/netmask info

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

I pushed a sample unikernel that reads the kernel command line, as a quick test 
to see if this will work for you Julian.  Note that you must pass it the right 
"extra" kernel args or it will just exit (I didn't bother with error handling 
as it's just during startup).

We don't expose a very flexible configuration interface through STACKV4 yet, so 
this unikernel is written explicitly from Ethif upwards.  It's quite nice that 
we can do this if the library abstractions aren't sufficient, if I do say so 
myself :-)

https://github.com/mirage/mirage-skeleton/tree/master/xen/static_website%2Bip

(note that this will only compile under Xen at the moment, not Unix)

-anil

On 26 Feb 2014, at 17:10, Julian Chesterfield <julian.chesterfield@xxxxxxxxx> 
wrote:

> I've opened a ticket for this discussion:
> 
> https://github.com/mirage/mirage/issues/228
> 
> - J
> 
> On 25 Feb 2014, at 20:40, Richard Mortier wrote:
> 
>> 
>> On 25 Feb 2014, at 17:09, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>> 
>>> Julian and I were looking into the various Xen config options for 
>>> networking this morning, and it turns out that the XL/XM toolstacks can 
>>> both specify a per-VIF ip/netmask/gateway directly in the VIF 
>>> configuration. e.g.
>>> 
>>> ```
>>> vif = ['bridge=xenbr0,ip=10.0.0.2,netmask=255.255.255.0,gateway=10.0.0.1']
>>> 
>>> These are written into the VIF backend tree in xenstore.
>> 
>> aha. i wondered about that. where's the best docs on xenstore -- it's 
>> probably something i should know a bit more about.
>> 
>>> I'd like to take advantage of this by having the network stack 
>>> automatically probe for it and use it if available (i.e. a 'default' mode 
>>> in the stack configuration, which can be overridden by the manual IP or 
>>> DHCP options).
>>> 
>>> Any thoughts on the best place to put it, though?  The obvious place is in 
>>> mirage-net-{unix/xen}, but we would need a Xenstore-equivalent for Unix 
>>> (which has come up several times. Dave, how viable is it to have a simple 
>>> Unix Xenstore that maps to a filesystem tree?  We can project configuration 
>>> variables into there for tuntap, and perhaps take care of bridge 
>>> configuration at the same time as well.
>> 
>> i can't comment on the viability of a unix equivalent, but that seems to 
>> make a lot of sense to me.
>> 
>>> Another backend that will need an equivalent registry-style interface are 
>>> the kFreeBSD backend (which could call back into userspace via an ioctl 
>>> interface).
>> 
>> what would the js backend do?  (or would the issue simply never arise?)
>> 
>> -- 
>> Cheers,
>> 
>> R.
>> 
>> 
>> 
>> 
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