adding 'mark' support in u32 filter

[Thomas Graf]

On 11/03/14 at 01:37pm, Sagi Lowenhardt wrote:
> Hi
> I've implemented support to filter by 'mark' and it seems to work fine but
> with 2 workarounds.
> 1. I have to set the filter as 'terminate', although it should be set
> automatically as I set 'flowid' (by to the code in f_u32.c in 'iproute'),
> otherwise the filter shown with asterisk and the filter does nothing.
> 2. I have to set selector, even with all values set to 0, otherwise I get
> errno 7-'Invalid input data or parameter' as I try to add the filter to TC.
> 
> Of course I'll send the patch as I complete the implementation, but I was
> wondering if these 2 workarounds can be eliminated somehow.

I think we should include these workarounds in libnl. We can fix the
kernel to be smarter but it will still require libnl to have the
workarounds for older kernels.