Re: Iterating all VNETs from userspace application

Thank you Bjoern, I'll have al

On Mon, Oct 18, 2021 at 10:49 AM Bjoern A. Zeeb
<bzeeb-lists@lists.zabbadoz.net> wrote:
>
> On 18 Oct 2021, at 4:46, Özkan KIRIK wrote:
>
> > Hi,
> >
> > I'm trying to gather all even within jails/vnet interface stats which
> > interface type ifmd_data.ifi_type == IFT_ETHER (6) for bsnmpd. Related
> > function (not modified) is here:
> >
> > https://github.com/freebsd/freebsd-src/blob/main/contrib/bsnmp/snmp_mibII/mibII.c#L926-L985
> >
> > It's possible to add a filter interface type adding a line below line
> > 961:
> > if (mib.ifmd_data.ifi_type != IFT_ETHER) return;
> >
> > I'm looking for a way to iterate VNET instances, but net/vnet.h is
> > only for kernel space.
> >         VNET_LIST_RLOCK_NOSLEEP();
> >         VNET_FOREACH(vnet_iter) {
> >                 CURVNET_SET(vnet_iter);
> >                 mib_refresh_iflist();
> >                 CURVNET_RESTORE();
> >         }
> >         VNET_LIST_RUNLOCK_NOSLEEP();
> > The code above not working in userspace.
> >
> > Also I wonder that if it's possible to switch between jails. The
> > pseudo code I want to write:
> >
> > JAIL_FOREACH(jail_iter) {
> >     jail_attach(jail_iter);
> >     mib_refresh_iflist();
> >     jail_detach();
> > }
> >
> > What is the right way to gather all interface stats ?
>
> Have a look at libkvm;  I seem to remember adding vnet support.
>
> /bz
>