Interesting new packet filtering language?

[Guy Harris <gharris () sonic net>]

        https://www.linkedin.com/posts/pchaigno_ebpf-share-7511419763886256128-CBhH/

        
https://ebpf.github.io/2026/slides/kunai-toward-a-verifier-safe-layered-dsl-for-nested-encapsulation-packet-filtering-on-ebpf.pdf

        https://dl.acm.org/doi/pdf/10.1145/3837779.3838166

        https://github.com/takehaya/bpf-ninja/tree/v0.23.1/pkg/kunai

Compiles to eBPF, not cBPF.

The language looks a bit verbose - for example, the first "eth" in eth/ipv4/udp/vxlan/eth/ipv4/tcp[dport==443] is 
redundant if you're capturing on Ethernet and wrong if you're not - but there might be some interesting ideas here.
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