APIs for tc action mirred

[Shriram Rajagopalan]

On Tue, Jul 23, 2013 at 12:29 PM, Thomas Graf <tgraf at suug.ch> wrote:
>
> On 07/20/13 at 01:10pm, Shriram Rajagopalan wrote:
> > Hi,
> >  I am trying to evaluate the possibility of programmatically doing the
> > following using libnl. Can someone please tell me if the following can
> > be done solely using libnl API in a c code or do I need to invoke an
> > external script ?
> >
> > tc filter add dev vnet0 parent ffff: proto ip pref 10 \
> >            u32 match u32  0 0 action mirred egress redirect dev ifb0
> >
> > Can anyone please point me to the right set of API (if any) to do this
> > inside C code ?
>
> The classifier API is documented here. There is no high level API for
> all of it yet so you will have to construct the Netlink message
> yourself or add the missing pieces to libnl.
>
> http://www.infradead.org/~tgr/libnl/doc/api/group__cls.html
>

Yes I saw those API and realized that I would have to construct the
relevant netlink messages
by hand. The protocol for bringing up/down an interface for example is
well documented/at least well known.
However, I couldnt find information on types of parameters/structs
that should go into the netlink
message for enabling egress redirect etc.

Should I be looking at "tc" sources and reverse engineering them
(ltrace/strace) ?


thanks
shriram