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For each hook, have a simple bpf_set_retval(bpf_get_retval) program and make sure it loads for the hooks we want. The exceptions are the hooks which don't propagate the error to the callers: - sockops - recvmsg - getpeername - getsockname - cg_skb ingress and egress Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20220823222555.523590-6-sdf@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>