none zero check of the classid in xt_cgroup

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Hello Daniel,

I have a question regarding xt_cgroup, again )

I'm interesting why did you add check for none zero id into cgroup_mt_check. With it, it's impossible to introduce some rules, like -m cgroup ! --cgroup 0. It could be useful for end user, for example, to block
all processes which was under cgroups, but not whole traffic.
Of course it could be made by ROOT_CGROUP with none 0 classid, which will contain all processes in the system. But, I think, in this case OS will be faced with little overhead to mark every packet.


--
Best regards,
Alexey Perevalov

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