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A malformed known IPv6 extension header should parse as Raw, not IPv6_Ext #2477

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#2480
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A malformed known IPv6 extension header should parse as Raw, not IPv6_Ext#2477
#2480
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fixPull requests that fix a defect (fix: subject prefix)
Milestone
PyPCAPKit v1.6

Description

@JarryShaw
JarryShaw
opened on Oct 30, 2026

A malformed known IPv6 extension header should parse as Raw, not IPv6_Ext

When a dedicated parser (HOPOPT, Routing, Opts, MH, HIP) raises, IPv6._import_next_layer re-parses that header as IPv6_Ext so the walk continues. Per RFC 8200 §4 a node discards such a packet, and RFC 6564 does not prescribe skipping. Maintainer's ruling: follow the RFC.

  • Drop the fallback-on-failure and __generic_ext_codes__. The failed header becomes Raw (via beholder) and the walk stops there.
  • Keep IPv6_Ext for Shim6, which is registered to it directly and has no parser of its own.
  • Update the docs that describe the fallback (ipv6.py, ipv6_ext.py, the ipv6-ext-entry-paths section) and the tests that pin it.

Waits for #2464's redo to land, since both edit ipv6_ext.py.

Activity

  1. JarryShaw
    added
    fixPull requests that fix a defect (fix: subject prefix)
    blockedDeferred pending another issue or decision; see the last comment for what unblocks it
    on Oct 30, 2026

  2. JarryShaw commented on Oct 30, 2026

    @JarryShaw
    JarryShaw
    on Oct 30, 2026
    OwnerAuthor

    Unblocks when #2464 reaches review: good-to-go; both edit ipv6_ext.py.

  3. github-actions
    added this to the PyPCAPKit v1.5 milestone on Oct 30, 2026
  4. JarryShaw
    added this to PyPCAPKiton Oct 30, 2026
  5. JarryShaw
    moved this to Blocked in PyPCAPKiton Oct 30, 2026
  6. JarryShaw
    added
    wipWork in flight - a covering PR is open or an agent is actively on it
    and removed
    blockedDeferred pending another issue or decision; see the last comment for what unblocks it
    on Oct 30, 2026

  7. JarryShaw commented on Oct 30, 2026

    @JarryShaw
    JarryShaw
    on Oct 30, 2026
    OwnerAuthor

    Unblocked (#2464 is good-to-go). Dispatched, stacked on #2464's branch since both edit ipv6_ext.py.

  8. JarryShaw
    moved this from Blocked to WIP in PyPCAPKiton Oct 30, 2026
  9. JarryShaw
    added a commit that references this issue on Oct 31, 2026

    fix(protocols)!: parse a malformed IPv6 extension header as Raw (#2477)

    ad7cd10
  10. JarryShaw
    modified the milestones: PyPCAPKit v1.5, PyPCAPKit v1.6 on Oct 31, 2026
  11. JarryShaw
    added a commit that references this issue on Oct 31, 2026

    fix(protocols)!: parse a malformed IPv6 extension header as Raw (#2477)…

    66a80c3
  12. JarryShaw
    closed this as completedin #2480on Oct 31, 2026
  13. github-project-automation
    moved this from WIP to Done in PyPCAPKiton Oct 31, 2026
  14. JarryShaw
    removed
    wipWork in flight - a covering PR is open or an agent is actively on it
    on Oct 31, 2026
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