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78 lines
2.9 KiB
Markdown
78 lines
2.9 KiB
Markdown
# eBPF
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[](https://pkg.go.dev/github.com/cilium/ebpf)
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eBPF is a pure Go library that provides utilities for loading, compiling, and
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debugging eBPF programs. It has minimal external dependencies and is intended to
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be used in long running processes.
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The library is maintained by [Cloudflare](https://www.cloudflare.com) and
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[Cilium](https://www.cilium.io).
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See [ebpf.io](https://ebpf.io) for other projects from the eBPF ecosystem.
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## Getting Started
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A small collection of Go and eBPF programs that serve as examples for building
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your own tools can be found under [examples/](examples/).
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Contributions are highly encouraged, as they highlight certain use cases of
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eBPF and the library, and help shape the future of the project.
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## Getting Help
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Please
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[join](https://ebpf.io/slack) the
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[#ebpf-go](https://cilium.slack.com/messages/ebpf-go) channel on Slack if you
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have questions regarding the library.
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## Packages
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This library includes the following packages:
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* [asm](https://pkg.go.dev/github.com/cilium/ebpf/asm) contains a basic
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assembler, allowing you to write eBPF assembly instructions directly
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within your Go code. (You don't need to use this if you prefer to write your eBPF program in C.)
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* [cmd/bpf2go](https://pkg.go.dev/github.com/cilium/ebpf/cmd/bpf2go) allows
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compiling and embedding eBPF programs written in C within Go code. As well as
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compiling the C code, it auto-generates Go code for loading and manipulating
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the eBPF program and map objects.
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* [link](https://pkg.go.dev/github.com/cilium/ebpf/link) allows attaching eBPF
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to various hooks
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* [perf](https://pkg.go.dev/github.com/cilium/ebpf/perf) allows reading from a
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`PERF_EVENT_ARRAY`
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* [ringbuf](https://pkg.go.dev/github.com/cilium/ebpf/ringbuf) allows reading from a
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`BPF_MAP_TYPE_RINGBUF` map
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* [features](https://pkg.go.dev/github.com/cilium/ebpf/features) implements the equivalent
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of `bpftool feature probe` for discovering BPF-related kernel features using native Go.
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* [rlimit](https://pkg.go.dev/github.com/cilium/ebpf/rlimit) provides a convenient API to lift
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the `RLIMIT_MEMLOCK` constraint on kernels before 5.11.
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## Requirements
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* A version of Go that is [supported by
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upstream](https://golang.org/doc/devel/release.html#policy)
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* Linux >= 4.9. CI is run against kernel.org LTS releases. 4.4 should work but is
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not tested against.
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## Regenerating Testdata
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Run `make` in the root of this repository to rebuild testdata in all
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subpackages. This requires Docker, as it relies on a standardized build
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environment to keep the build output stable.
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It is possible to regenerate data using Podman by overriding the `CONTAINER_*`
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variables: `CONTAINER_ENGINE=podman CONTAINER_RUN_ARGS= make`.
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The toolchain image build files are kept in [testdata/docker/](testdata/docker/).
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## License
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MIT
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### eBPF Gopher
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The eBPF honeygopher is based on the Go gopher designed by Renee French.
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