parse_port now rejects port ranges ('1024:65535') with a clear
error message instead of silently using only the first number.
FilterRule uses a single u16 field and cannot represent ranges.
infer_context now documents the hardcoded 40-byte IPv6 header
limitation: smoltcp's next_header() chases extension headers to
return the final protocol, but the transport offset is not
computed. Port extraction silently returns None/None for packets
with extension headers, which is safe but means port-based
filter rules won't match for such packets.
Red Bear OS
0f5a4f59f4