netdev - RE: [Xen-devel] [PATCH v2 net-next] xen-netback: add support for multicast control

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Date:	Thu, 3 Sep 2015 09:00:44 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	Ian Campbell <Ian.Campbell@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Xen-devel] [PATCH v2 net-next] xen-netback: add support for
 multicast control

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@...e.com]
> Sent: 03 September 2015 09:57
> To: Paul Durrant
> Cc: Ian Campbell; Wei Liu; xen-devel@...ts.xenproject.org;
> netdev@...r.kernel.org
> Subject: Re: [Xen-devel] [PATCH v2 net-next] xen-netback: add support for
> multicast control
> 
> >>> On 02.09.15 at 18:58, <paul.durrant@...rix.com> wrote:
> > @@ -1215,6 +1289,31 @@ static void xenvif_tx_build_gops(struct
> xenvif_queue *queue,
> >  				break;
> >  		}
> >
> > +		if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1].type) {
> > +			struct xen_netif_extra_info *extra;
> > +
> > +			extra =
> &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1];
> > +			ret = xenvif_mcast_add(queue->vif, extra-
> >u.mcast.addr);
> 
> What's the reason this call isn't gated on vif->multicast_control?
> 

No particular reason. I guess it eats a small amount of memory for no gain but a well behaved frontend wouldn't send such a request and a malicious one can only send 64 of them before netback starts to reject them.

  Paul

> Jan

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