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Implement session cookie for fsession. The session cookies will be stored in the stack, and the layout of the stack will look like this: return value -> 8 bytes argN -> 8 bytes ... arg1 -> 8 bytes nr_args -> 8 bytes ip (optional) -> 8 bytes cookie2 -> 8 bytes cookie1 -> 8 bytes The offset of the cookie for the current bpf program, which is in 8-byte units, is stored in the "(((u64 *)ctx)[-1] >> BPF_TRAMP_COOKIE_INDEX_SHIFT) & 0xFF". Therefore, we can get the session cookie with ((u64 *)ctx)[-offset]. Implement and inline the bpf_session_cookie() for the fsession in the verifier. Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn> Link: https://lore.kernel.org/r/20260124062008.8657-6-dongml2@chinatelecom.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>