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The bpf-helpers(7) man pages provide an invaluable description of the functions that an eBPF program can call at runtime. Link them here. Signed-off-by: Joe Stringer <joe@wand.net.nz> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200813180807.2821735-1-joe@wand.net.nz