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26b2ed0a6a
Follow-up cleanups to the IPv6 fragment extension header support added in the previous commit: - Document that minFragBlks is sized for IPv4 but intentionally reused by decode6 for IPv6 fragments, where it is conservative (IPv6 fragments carry no per-fragment IP header) and only ever rejects more later fragments as Unknown, never fewer. - Add a TestDecode case for a first fragment reachable only through a chained extension header (base Next Header = Hop-by-Hop Options, which chains to Fragment). decode6 only parses the Fragment header when it is the base header's immediate Next Header, so this must classify as Unknown. The test locks in that scoping decision. Updates #20083 Updates #20140 Change-Id: Ibece03c6baf2385b0cc399f179819b08cbe921cc Signed-off-by: James Tucker <james@tailscale.com>