Inspecting a gre tunnel passing through a freebsd pf firewall ?

[Vikash Badal]

Greetings,

Is it possible to inspect and filter a gre tunnel passing through a pf
based freebsd firewall ?

I would like to rate limit certain traffic (syn, http etc) that is
encapsulated in the gre tunnel passing thru the freebsd firewall?

Is this possible ? If so how ? 

Thanks
Vikash
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