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The bpf_flow program is able to handle GRE headers in IP packets. Add a few test data input simulating those GRE packets, with 2 different cases: - parse GRE and the encapsulated packet - parse GRE only Acked-by: Stanislav Fomichev <sdf@fomichev.me> Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com> Link: https://lore.kernel.org/r/20241120-flow_dissector-v3-6-45b46494f937@bootlin.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>