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# Aya
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[![Crates.io][crates-badge]][crates-url]
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![License][license-badge]
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![Build status][build-badge]
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[![Book][book-badge]][book-url]
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[crates-badge]: https://img.shields.io/crates/v/aya.svg?style=for-the-badge&logo=rust
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[crates-url]: https://crates.io/crates/aya
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[license-badge]: https://img.shields.io/badge/license-MIT%2FApache--2.0-blue?style=for-the-badge
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[build-badge]: https://img.shields.io/github/workflow/status/aya-rs/aya/build-aya?style=for-the-badge&logo=github
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[book-badge]: https://img.shields.io/badge/read%20the-book-9cf.svg?style=for-the-badge&logo=mdbook
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[book-url]: http://aya-rs.github.io/book/
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## API Documentation
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[![Unreleased Documentation][git-docs-badge]][git-api-docs] [![Documentaiton][api-docs-badge]][api-docs]
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[git-docs-badge]: https://img.shields.io/badge/docs-unreleased-red.svg?style=for-the-badge&logo=docsdotrs
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[git-api-docs]: https://aya-rs.netlify.app
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[api-docs-badge]: https://img.shields.io/badge/docs-released-blue.svg?style=for-the-badge&logo=docsdotrs
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[api-docs]: https://docs.rs/aya
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## Community
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[![Discord][discord-badge]][chat-url] [![Awesome][awesome-badge]][awesome-aya]
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Join [the conversation on Discord][chat-url] to discuss anything related to Aya, or discover
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and contribute to a list of [Awesome Aya][awesome-aya] projects.
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[discord-badge]: https://img.shields.io/badge/Discord-chat-5865F2?style=for-the-badge&logo=discord
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[chat-url]: https://discord.gg/xHW2cb2N6G
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[awesome-aya]: https://github.com/aya-rs/awesome-aya
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[awesome-badge]: https://img.shields.io/badge/Awesome-Aya-FC60A8?style=for-the-badge&logo=awesomelists
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## Overview
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eBPF is a technology that allows running user-supplied programs inside the Linux
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kernel. For more info see https://ebpf.io/what-is-ebpf.
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Aya is an eBPF library built with a focus on operability and developer
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experience. It does not rely on [libbpf] nor [bcc] - it's built from the ground
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up purely in Rust, using only the [libc] crate to execute syscalls. With BTF
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support and when linked with musl, it offers a true [compile once, run
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everywhere solution][co-re], where a single self-contained binary can be
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deployed on many linux distributions and kernel versions.
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Some of the major features provided include:
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* Support for the **BPF Type Format** (BTF), which is transparently enabled when
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supported by the target kernel. This allows eBPF programs compiled against
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one kernel version to run on different kernel versions without the need to
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recompile.
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* Support for function call relocation and global data maps, which
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allows eBPF programs to make **function calls** and use **global variables
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and initializers**.
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* **Async support** with both [tokio] and [async-std].
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* Easy to deploy and fast to build: aya doesn't require a kernel build or
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compiled headers, and not even a C toolchain; a release build completes in a matter
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of seconds.
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[libbpf]: https://github.com/libbpf/libbpf
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[bcc]: https://github.com/iovisor/bcc
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[libc]: https://docs.rs/libc
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[co-re]: https://facebookmicrosites.github.io/bpf/blog/2020/02/19/bpf-portability-and-co-re.html
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[tokio]: https://docs.rs/tokio
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[async-std]: https://docs.rs/async-std
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### Example
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Aya supports a large chunk of the eBPF API. The following example shows how to use a
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`BPF_PROG_TYPE_CGROUP_SKB` program with aya:
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```rust
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use std::fs::File;
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use std::convert::TryInto;
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use aya::Bpf;
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use aya::programs::{CgroupSkb, CgroupSkbAttachType};
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// load the BPF code
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let mut bpf = Bpf::load_file("bpf.o")?;
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// get the `ingress_filter` program compiled into `bpf.o`.
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let ingress: &mut CgroupSkb = bpf.program_mut("ingress_filter")?.try_into()?;
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// load the program into the kernel
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ingress.load()?;
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// attach the program to the root cgroup. `ingress_filter` will be called for all
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// incoming packets.
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let cgroup = File::open("/sys/fs/cgroup/unified")?;
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ingress.attach(cgroup, CgroupSkbAttachType::Ingress)?;
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```
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## Contributing
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Please see the [contributing guide](https://github.com/aya-rs/aya/blob/main/CONTRIBUTING.md).
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## License
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Aya is distributed under the terms of either the [MIT license] or the [Apache License] (version
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2.0), at your option.
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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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[MIT license]: https://github.com/aya-rs/aya/blob/main/LICENSE-MIT
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[Apache license]: https://github.com/aya-rs/aya/blob/main/LICENSE-APACHE
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