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fix(hip)!: parse and keep the two fixed header bits (#1459) - #1462
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RFC 7401 section 5.1 reserves the leading bit of Packet Type and the low-order bit of Version for SHIM6: "MUST be set as shown when sending and MUST be ignored when receiving". HIP.read raised ProtocolError unless they read 0 and 1. - read() no longer validates them and keeps them as the new required Data_HIP fields packet_fixed and version_fixed. - make() takes packet_fixed=0 and version_fixed=1, the RFC values, and _make_data passes them through, so from_data rebuilds byte-exact. - test_hip_unit: the two cases that pinned the rejection now pin the parse.
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Verdict: GOOD TO GO at
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Coverage: 89.51% (unit tier, Python 3.14,
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…fixed #1454 merged before the three fixes, so its stale-entry check now fails on main: #1455 (L2TPv2/OSPF trailer), #1456/#1457 (RPL) and #1459 (HIP fixed bits) all come back OK. Drop those entries. The HIP fixed-bit cuts and two RPL in-IPv6 cut55 cases now parse but zero-fill, so they move under the #1451/#1458 short-read gaps. All four edge modules pass.
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make pylint,make mypy,make isort) — mypy only: 0 errors in the three HIP filesmake testpasses, and a test case covers the change —protocols/internetleg, capture round-trip,tests/projectdocs/source/changelog/and regeneratedCHANGELOG.md, if the change is user-visible — N/A — centralised in docs(changelog): shared 1.5.0 changelog — long-lived, merges last (#610, #616, #617, #618, #620) #657What is the purpose of your pull request?
fix— corrects a defectfeat— adds a featureperf— changes performance, not behaviourrefactor— changes neither behaviour nor performancetest— tests onlydocs— documentation onlyci— workflows or build toolingrelease— bumps the version or rolls up a distributionchore— anything elseDescription of your pull request and other information
Closes #1459
RFC 7401 §5.1: the two fixed bits "MUST be ignored when receiving".
read()no longer rejects them and keeps them aspacket_fixedandversion_fixed.make()writes them, defaulting to the RFC values0/1.Breaking:
Data_HIPgains two required fields.Before:
59 04 10 20 …and59 04 90 21 …raisedProtocolError: HIP: invalid format. After: both parse andfrom_datarebuilds them byte-exact.New
test_hip_fixed_bits_unit.pyfails 7 of 8 checks without the fix. Two cases intest_hip_unit.pythat pinned the rejection now pin the parse. Legprotocols/internet: 604 tests, 0 failures. Capture round-trip: 4 passed.tests/project: 419 passed, 1 skipped.examples/capturesinfo: 1567 frames unchanged; the 49 HIP frames differ only by the two new keys.