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BPF ISA web page


From: Denis Ovsienko <denis () ovsienko info>
Date: Sat, 8 Nov 2025 19:47:36 +0000

Hello all.

Whilst working on some recent improvements in libpcap, I often had to
cross-reference the source code with the 1993 BPF specification, which
still seems to be the most detailed definition of the ISA.  The matter
is, there are various discrepancies between the spec and the code, and
not every discrepancy is a bug, and it became unwieldy to keep notes of
what is what, so eventually I decided to make a new resource to bridge
the 1993 specification and the current implementations:

https://www.tcpdump.org/bpfisa.html

If you think anything is incorrect or missing, let me know.

-- 
    Denis Ovsienko
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