aya/bpf/aya-bpf
Michal Rostecki 895f96e971 ebpf: Add TcContext for classifier programs
This change separates the previous `SkBuffContext` into three structs:

* `SkBuff` which is a wrapper around `__sk_buff` which contains all
  possible methods operating on it.
* `SkBuffContext` which is a program context for programs which
  **cannot** access `__sk_buff` directly and instead can only use
  `load_bytes`.
* `TcContext` which is a classifier context which can access `__sk_buff`
  directly, hence exposes `data` and `data_end`.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
..
src ebpf: Add TcContext for classifier programs
Cargo.toml Change from Rust edition 2018 to 2021
build.rs bpf: Only use never type with rust nightly