On Fri, Jan 13, 2017 at 13:15 +0100, Mike Belopuhov wrote:
> On 13 January 2017 at 13:11, Sebastian Benoit <[email protected]> wrote:
> > On current, there seem to be two problems with lo(4) interfaces:
> >
> > 1. "ifconfig lo6 up" fails
> >
> > # ifconfig lo6 create
> > # ifconfig lo6 up
> > ifconfig: SIOCSIFFLAGS: Inappropriate ioctl for device
> > # ifconfig lo6 destroy
> > #
> >
> > The sys/net/rdomains regress test fails because of this, and i think
> > sys/net/if.c rev 1.473 might be the cause.
> >
> > It still works on a kernel from early December.
> >
> > 2. "ifconfig lo6 destroy" fails on an interface in an rdomain
> >
> > # ifconfig lo6 create
> > # ifconfig lo6 rdomain 6
> > # ifconfig lo6
> > lo6: flags=8008<LOOPBACK,MULTICAST> rdomain 6 mtu 32768
> > index 12 priority 0 llprio 3
> > groups: lo
> > # ifconfig lo6 destroy
> > ifconfig: SIOCIFDESTROY: Operation not permitted
> >
> > This has been broken a bit longer, it still works in 6.0.
> >
>
> it's not broken, we have introduced automagic loopback interface
> creation when you create an rdomain. this means you have to do
> "ifconfig lo6 create rdomain 6".
However, I've just found a subtle bug here: destroying a loopback
interface corresponding to a newly created rdomain will fail, while
destroying loopback interfaces created in the same rdomain afterwards
will work. Observe:
kemushi:~% sudo ifconfig lo9 create rdomain 9
kemushi:~% sudo ifconfig lo9
lo9: flags=8008<LOOPBACK,MULTICAST> rdomain 9 mtu 32768
index 13 priority 0 llprio 3
groups: lo
kemushi:~% sudo ifconfig lo9 destroy
ifconfig: SIOCIFDESTROY: Operation not permitted
kemushi:~% sudo ifconfig lo9 rdomain 0
kemushi:~% sudo ifconfig lo9 destroy
Now we create lo9 again in the same rdomain:
kemushi:~% sudo ifconfig lo9
lo9: no such interface
kemushi:~% sudo ifconfig lo9 create rdomain 9
kemushi:~% sudo ifconfig lo9
lo9: flags=8008<LOOPBACK,MULTICAST> rdomain 9 mtu 32768
index 14 priority 0 llprio 3
groups: lo
kemushi:~% sudo ifconfig lo9 destroy
kemushi:~%
