aya-ebpf: Add set_reply accessor to SockOpsContext

aya-rs / aya

Aya is an eBPF library for the Rust programming language, built with a focus on developer experience and operability.

https://aya-rs.dev/book/

Apache License 2.0

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Closed l2dy closed 2 months ago

l2dy commented 2 months ago

A sock_ops program should always return 1 on success, otherwise __cgroup_bpf_run_filter_sock_ops() would return -EPERM.

The reply fields of the bpf_sock_ops struct are there in case a bpf program needs to return a value. For example, BPF_SOCK_OPS_TIMEOUT_INIT and BPF_SOCK_OPS_RWND_INIT are invoked via tcp_call_bpf(), which returns sock_ops.reply on success.

This follows up commit 3f6b2507b6c5c0da19b3a7fe3145240c3bab3c69 to cover all common accessors.

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