On 07/01/2011 09:45 AM, Nicolas de Pesloüan wrote:

Le 01/07/2011 17:01, Michał Mirosław a écrit :

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We could introduce a catch-all macvlan/vlan device that would take
addresses/VLANs which are not covered by other configured
macvlans/vlans. This would allow clearer configuration and would make
the evaluation order explicit. As a bonus, this will give another
device to put tcpdump on. ;-)

'Sounds like what I had in mind in
http://marc.info/?l=linux-netdev&m=130622112921245&w=2 .

Almost. My idea assumes that eth0.any won't strip VLAN headers (so its
just looks like a filtered eth0).

I originally thought unstripped packets should go to eth0.

But, if eth0.any get untagged packets, we face two problems:

1/ We need a way to retrieve the original tag.
2/ We need a way to force the tag on output (or we consider eth0.any a
pure tcpdump device, which is less useful).

But if eth0.any get the exact same packets as those delivered to eth0,
this seems useless.

Or maybe, eth0.any should get only packets that weren't delivered to any
eth0.XXXX devices... and should be named eth0.unmatched instead of
eth0.any :-)

Do we need eth0.untagged too (which would only get packets that were
originally *not* tagged)?

eth0 - Get everything, untouched. (I know several people except tagged
packets to be untagged here, but I disagree with this part. eth0 is the
raw device and should deliver raw packets, possibly retagging packets
that were untagged by hw-accel).
eth0.100 - Get VLAN 100 packet, untagged.
eth0.untagged - Get only non-tagged packets, untouched.
eth0.unmatched - Get only tagged packets, untouched.

Lets let the current vlan tagging changes settle a while before
adding yet more cruft in this area.

Packet filters should be able to filter on tags or not, so I don't
think these extra interfaces would be useful or needed.  We may
need to fix up the sk-filter logic a bit to deal with the
stripped tags, however.

Thanks,
Ben

-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com