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Forwarded IPv6 TCP and UDP packets with extension headers had their checksums recalculated using the base header's next-header value. That field identifies the first extension, so it produced an incorrect transport pseudoheader checksum. Use the protocol of the matched transport header when constructing the pseudoheader. Cover TCP and UDP with hop-by-hop and destination options at the checksum helper and through forwarding with masquerade. Validate UDP checksums explicitly in the existing forwarding test.
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Forwarding IPv6 packets with extension headers could replace valid TCP
and UDP checksums with invalid ones. Software checksum recalculation
used the IPv6 base header's next-header field, which identifies the
first extension rather than the upper-layer protocol.
Build the pseudoheader with the protocol of the matched TCP or UDP
header. Extend the existing masquerade test with hop-by-hop and
destination options, explicitly validate UDP checksums, and cover the
same protocol selection at the packet buffer boundary.
Assisted-by: OpenAI Codex