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fix(ipv6-route): a truncated RPL address list is split by the octets read, not by Hdr Ext Len #1457
Description
Bug. When an RPL routing header is cut short, its address list is split by the number of octets actually read rather than by Hdr Ext Len (pcapkit/protocols/schema/internet/ipv6_route.py:280-305). Depending on where the cut falls, the parse raises a non-library exception, or info rebuilds with the wrong Hdr Ext Len.
Repro on main (b14d676c5):
rt = bytes([59, 2, 3, 1, 0, 0, 0, 0]) + bytes(range(1, 17)) # uncompressed, one address
IPv6_Route(rt[:23], 23) # builtins.ValueError: ... does not appear to be an IPv4 or IPv6 address
IPv6_Route(rt[:12], 12) # ProtocolError: IPv6-Route: [TypeNo 3] invalid formatThe worker also reports that with CmprI=CmprE=8 and a cut at 12 octets, the header rebuilds with Hdr Ext Len 1 instead of 2.
Activity
test(protocols): edge-case round trips for every layer family (#1202)
JarryShaw commentedon Oct 9, 2026
A worker is on it now, on branch
fix/1456-1457-rpl-routing.JarryShaw commentedon Oct 9, 2026
Correction to the second repro above:
IPv6_Route(rt[:12], 12)parses. It is the rebuild,IPv6_Route.from_data(r.info), that raisesProtocolError: IPv6-Route: [TypeNo 3] invalid format. I re-checked this onmain, and the first repro (rt[:23]raising a builtinsValueErrorat parse) stands.test(protocols): edge-case round trips for every layer family (#1202)
test(protocols): edge-case round trips for every layer family (#1202) (…
fix(ipv6-route): rebuild RPL source routes byte for byte (#1456, #1457)…
test(roundtrip): drop the edge-case gaps that #1460, #1462 and #1463 …