[Bug 202484] vtnet drivers didn't support being use for multicast routing (MRT_ADD_VIF)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202484

--- Comment #1 from olivier at cochard.me ---
errno(2) translate error number 45 by a EOPNOTSUPP.

And code in netinet/ip_mroute.c can return EOPNOTSUPP in 2 cases:

 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {
    CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__);
    VIF_UNLOCK();
    return EOPNOTSUPP;

or

    } else {        /* Make sure the interface supports multicast */
    if ((ifp->if_flags & IFF_MULTICAST) == 0) {
        VIF_UNLOCK();
        return EOPNOTSUPP;

But a vtnet interface seems to correctly set IFF_MULTICAST because
dev/virtio/network/if_vtnet.c includes:

vtnet_setup_interface(struct vtnet_softc *sc)
{
    ...
    ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
    ...

}

Then how to troubleshoot deeper this problem ?

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