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

[Nicolas Ojeda Bar <no263@xxxxxxxxxxxxxxx>]

Dear Robert,

Don't worry about "IP6" appearing in red - it just means that the
example ping program does not handle IPv6 traffic: see

https://github.com/mirage/mirage-skeleton/blob/master/ping/unikernel.ml#L48

for the relevant line (I guess the debug output leaves a lot to be desired...).

There is an IPv6-aware ping program in mirage-skeleton/ping6.

Best wishes,
Nicolas


On Wed, Apr 29, 2015 at 6:08 PM, Robert Ream <robertream@xxxxxxxxx> wrote:
> Thanks Mindy and everyone for all the input! Doing a make clean and running
> with elevated privileges has moved the bar, I'm now building and running the
> network samples. Yay!
>
> But... I've run into more issues.
>
> First, this is the output when I run sudo ./mir-ping:
>
> plugging into tap0 with mac c2:9d:56:19:d7:2c..
> Netif: connect tap0
> starting...
> ARP: sending gratuitous from 10.0.0.2
> IP6
> Netif: error, terminating listen loop
> done!
>
> I'm not sure what I was suppose to expect as the output but it says there
> was an error and that "IP6" is actually coloured red so that can't be good?
> But the error might be related to the second issue that I see which is that
> whenever I run a network related sample, the tap0 interface just disappears,
> or maybe gets deleted. I am unfortunately fairly inexperienced with tun/tap
> so I'm not sure if this is the expected behaviour, but I'm guessing these
> two errors might be related to each other and I'm on the verge of success if
> I fix this last problem.
>
> -Robert
>
>
> On Wed, Apr 29, 2015 at 7:56 AM, Mindy <mindy@xxxxxxxxxxxxxxxxxxx> wrote:
>>
>>
>>
>> On 04/29/2015 11:58 AM, Justin Cormack wrote:
>>>
>>> On 29 April 2015 at 10:35, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx>
>>> wrote:
>>>>
>>>> Third, when I managed to get one of the network samples building, for
>>>> example "ping", I couldn't get the unikernel running locally with a
>>>> tun/tap
>>>> device I created. Even though I use tapctl to create a tap0 device owned
>>>> by
>>>> my user account, just like the tutorial advises, when I go to execute
>>>> the
>>>> unikernel I still get this error:
>>>>
>>>> Fatal error: exception Failure("net_tap0")
>>>> Raised at file "src/core/lwt.ml", line 788, characters 22-23
>>>> Called from file "src/unix/lwt_main.ml", line 34, characters 8-18
>>>> Called from file "main.ml", line 47, characters 2-28
>>>>
>>>>
>>>> This is rather cryptic but might indicate that you need to run the
>>>> command
>>>> using sudo.
>>>
>>> What does strace show here? It might be permissions but if you made
>>> the device owned by your user account it shouldnt be. You may need to
>>> make /dev/net/tun world read and write (which is safe to do).
>>
>> On 14.04.2, I need to run with sudo even if the device is owned by my
>> user, I've made it with tunctl -u me, and the mode is u+rwx, otherwise
>> strace shows
>>
>> open("/dev/net/tun", O_RDWR)            = 4
>> ioctl(4, TUNSETIFF, 0x7fffb7dd0a20)     = 0
>> ioctl(4, TUNSETPERSIST, 0)              = 0
>> fcntl(4, F_GETFL)                       = 0x8002 (flags
>> O_RDWR|O_LARGEFILE)
>> fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK|O_LARGEFILE) = 0
>> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 5
>> ioctl(5, SIOCGIFFLAGS, {ifr_name="tap0",
>> ifr_flags=IFF_BROADCAST|IFF_MULTICAST}) = 0
>> ioctl(5, SIOCSIFFLAGS, {ifr_name="tap0", ???}) = -1 EPERM (Operation not
>> permitted)
>>
>> So you may need to run it with elevated privileges even if it seems like
>> you should be able to get away with running it as yourself.
>>
>> (Thanks for the bug report; attempting to reproduce it got me to actually
>> use the tap interface for the first time.)
>>
>> -Mindy
>>
>>
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>
>
>
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