Re: [MirageOS-devel] Mirage OS 2.4 errors on install and mirage-skeleton build

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

On 5 May 2015, at 01:47, Justin Cormack <justin@xxxxxxxxxxxxxxxxxxxxx> wrote:
> 
> On 5 May 2015 at 09:35, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>> On 4 May 2015, at 14:50, Justin Cormack <justin@xxxxxxxxxxxxxxxxxxxxx> wrote:
>>> 
>>> I have sent a pull request to fix the requires root issue - it was
>>> trying to bring the interface up which requires root, so long as it is
>>> already up this is fine, I use:
>>> 
>>> sudo ip tuntap add dev tap0 mode tap user justin && sudo ip link set dev 
>>> tap0 up
>>> 
>>> to create interfaces. The disappearing thing is the interface going
>>> down again, it is not a persistence thing, as it is not actually
>>> removed.
>>> 
>> 
>> This almost works for me, except that I still get a permissions error
>> since the `set_up_and_running` ioctl call checks for IFF_MULTICAST and
>> IFF_BROADCAST in addition to IFF_UP and IFF_RUNNING.  These aren't
>> set when I create a persistent tun with `otun add tun10 tun`, but it
>> shouldn't matter much if those aren't set.  Any particular reason that
>> we need them?
> 
> Odd, I can't replicate that, in fact I can't create any interfaces
> which don't have multicast and broadcast set. On the other hand,
> IFF_UP is the only flag that actually matters at this point, so just
> testing for that would be sufficient.

How are you creating the tun interfaces?  I'm using the ocaml-tuntap otun
binary, which may not be calling an ioctl to set those flags.

-anil
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