netdev - Re: [PATCH 1/2] ipvlan: don't loose broadcast MAC when setting MAC filters

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Date:	Mon, 30 Mar 2015 22:05:58 -0500
From:	Dan Williams <dcbw@...hat.com>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	linux-netdev <netdev@...r.kernel.org>, jbenc@...hat.com
Subject: Re: [PATCH 1/2] ipvlan: don't loose broadcast MAC when setting MAC
 filters

On Mon, 2015-03-30 at 14:11 -0700, Mahesh Bandewar wrote:
> On Mon, Mar 30, 2015 at 2:01 PM, Dan Williams <dcbw@...hat.com> wrote:
> > On Mon, 2015-03-30 at 13:28 -0700, Mahesh Bandewar wrote:
> >> On Thu, Mar 26, 2015 at 3:41 PM, Dan Williams <dcbw@...hat.com> wrote:
> >> > The broadcast MAC is supposed to be allowed whenever the device
> >> > has an IPv4 address, otherwise ARP requests get dropped on the
> >> > floor.  If ndo_set_rx_mode (and thus
> >> > ipvlan_set_multicast_mac_filter()) gets called after the address
> >> > was added, it blows away the broadcast MAC address in
> >> > mac_filters that was added at IPv4 address addition.  Fix that.
> >> >
> >> > Signed-off-by: Dan Williams <dcbw@...hat.com>
> >> Acked-by: Mahesh Bandewar <maheshb@...gle.com>
> >
> > I'm actually going to send another patch that supercedes this one and
> > handles the DHCP issue in a slightly different way.
> >
> Sure, I'll take a look at that but irrespective of how DHCP is
> handled, this patch fixes the problem that you have described since
> ndo_set_rxmode will wipe the broadcast bit if set and will end up
> breaking the IPv4. So I feel that this is still required in some-form.

That's true, which is why I originally split the patches up.  So I'm
fine if this is applied.  But the DHCP bits will change this part too.

Dan

> > Dan
> >
> >> > ---
> >> >  drivers/net/ipvlan/ipvlan_main.c | 3 +++
> >> >  1 file changed, 3 insertions(+)
> >> >
> >> > diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
> >> > index 4f4099d..d34f580 100644
> >> > --- a/drivers/net/ipvlan/ipvlan_main.c
> >> > +++ b/drivers/net/ipvlan/ipvlan_main.c
> >> > @@ -241,6 +241,9 @@ static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
> >> >
> >> >                 bitmap_copy(ipvlan->mac_filters, mc_filters,
> >> >                             IPVLAN_MAC_FILTER_SIZE);
> >> > +
> >> > +               if (ipvlan->ipv4cnt)
> >> > +                       ipvlan_set_broadcast_mac_filter(ipvlan, true);
> >> >         }
> >> >         dev_uc_sync(ipvlan->phy_dev, dev);
> >> >         dev_mc_sync(ipvlan->phy_dev, dev);
> >> > --
> >> > 2.1.0
> >> >
> >> >
> >> --
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> >
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