Re: [RFC net-next] net: sch_clsact: add support for global per-netns classifier mode

Wed, Sep 06, 2017 at 06:04:17AM CEST, roopa@cumulusnetworks.com wrote:

On Tue, Sep 5, 2017 at 3:45 PM, Daniel Borkmann [off-list ref] wrote:

quoted

On 09/06/2017 12:01 AM, Roopa Prabhu wrote:

quoted

On Tue, Sep 5, 2017 at 11:18 AM, Cong Wang [off-list ref]
wrote:

quoted

On Tue, Sep 5, 2017 at 5:48 AM, Nikolay Aleksandrov
[off-list ref] wrote:

quoted

Hi all,
This RFC adds a new mode for clsact which designates a device's egress
classifier as global per netns. The packets that are not classified for
a particular device will be classified using the global classifier.
We have needed a global classifier for some time now for various
purposes and setting the single bridge or loopback/vrf device as the

Can you elaborate a bit more on the ... "we have needed a global
classifier for some time now for various purposes".

Most of our acl's are global or use a wildcard. eg iptables supports
global rules without an dev. We do end up having hundreds of netdevs.
Another use case for the future is use of tc for policy based routing
which requires global rules.

That is not how TC works. There are devices, qdiscs, blocks, chains. The
global approach does not fit. The block sharing gets you what you need,
without need for any ugly hack.