I did a test bed with bunch of ng_tees, ifaces, dumps and so on.
Packets seem to be broken in tcpdump - on testbed, but that doesn't affect traffic flow, which means ip-eth mismatch (most likely proper set_dlt for ngX required)
It's working!
Next step will be adding ng_bpf to classification engine and creation of some tests (say, classify icmp/ssh to different classes)
I've added some logging to the module. So, classified ping looks like this:
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