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network_helpers.c provides some helpers to generate ip checksums or ip pseudo-header checksums, but not for upper layers (eg: udp checksums) Add helpers for udp checksum to allow manually building udp packets. Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Link: https://lore.kernel.org/r/20241120-flow_dissector-v3-12-45b46494f937@bootlin.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>