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Exercise software UDP checksums when splice() transfers multiple pipe fragments into a corked datagram. Use separate source pipes so short writes cannot merge, and use odd fragment lengths to expose checksum-position errors between fragments. Cover IPv4, IPv6 and IPv4-mapped destinations, connected and unconnected sockets, resident prefixes, even and odd fragment lengths, and a fragment starting near a page boundary. Ordinary sends provide a control. Check the complete payload and reject extra datagrams after a successful send. Keep receive waits bounded and skip unavailable address families or pipe capacities. The test uses only loopback sockets with ephemeral ports and has no dependency on the application that exposed the regression. Signed-off-by: Alireza Asgari <alireza@asgari.net> Link: https://patch.msgid.link/20260924-fix-udp-splice-checksum-v1-2-fe61d65447a8@asgari.net Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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